Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

vendor/object/src/archive.rs

@@ -0,0 +1,91 @@
+//! Archive definitions.
+//!
+//! These definitions are independent of read/write support, although we do implement
+//! some traits useful for those.
+
+use crate::pod::Pod;
+
+/// File identification bytes stored at the beginning of the file.
+pub const MAGIC: [u8; 8] = *b"!<arch>\n";
+
+/// File identification bytes at the beginning of AIX big archive.
+pub const AIX_BIG_MAGIC: [u8; 8] = *b"<bigaf>\n";
+
+/// File identification bytes stored at the beginning of a thin archive.
+///
+/// A thin archive only contains a symbol table and file names.
+pub const THIN_MAGIC: [u8; 8] = *b"!<thin>\n";
+
+/// The terminator for each archive member header.
+pub const TERMINATOR: [u8; 2] = *b"`\n";
+
+/// The header at the start of an archive member.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct Header {
+    /// The file name.
+    pub name: [u8; 16],
+    /// File modification timestamp in decimal.
+    pub date: [u8; 12],
+    /// User ID in decimal.
+    pub uid: [u8; 6],
+    /// Group ID in decimal.
+    pub gid: [u8; 6],
+    /// File mode in octal.
+    pub mode: [u8; 8],
+    /// File size in decimal.
+    pub size: [u8; 10],
+    /// Must be equal to `TERMINATOR`.
+    pub terminator: [u8; 2],
+}
+
+/// The header at the start of an AIX big archive member, without name.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct AixHeader {
+    /// File member size in decimal.
+    pub size: [u8; 20],
+    /// Next member offset in decimal.
+    pub nxtmem: [u8; 20],
+    /// Previous member offset in decimal.
+    pub prvmem: [u8; 20],
+    /// File member date in decimal.
+    pub date: [u8; 12],
+    /// File member user id in decimal.
+    pub uid: [u8; 12],
+    /// File member group id in decimal.
+    pub gid: [u8; 12],
+    /// File member mode in octal.
+    pub mode: [u8; 12],
+    /// File member name length in decimal.
+    pub namlen: [u8; 4],
+}
+
+/// The AIX big archive's fixed length header at file beginning.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct AixFileHeader {
+    /// Archive magic string.
+    pub magic: [u8; 8],
+    /// Offset of member table.
+    pub memoff: [u8; 20],
+    /// Offset of global symbol table.
+    pub gstoff: [u8; 20],
+    /// Offset of global symbol table for 64-bit objects.
+    pub gst64off: [u8; 20],
+    /// Offset of first member.
+    pub fstmoff: [u8; 20],
+    /// Offset of last member.
+    pub lstmoff: [u8; 20],
+    /// Offset of first member on free list.
+    pub freeoff: [u8; 20],
+}
+
+/// Offset of a member in an AIX big archive.
+///
+/// This is used in the member index.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct AixMemberOffset(pub [u8; 20]);
+
+unsafe_impl_pod!(Header, AixHeader, AixFileHeader, AixMemberOffset,);

vendor/object/src/common.rs

@@ -0,0 +1,536 @@
+/// A CPU architecture.
+#[allow(missing_docs)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[non_exhaustive]
+pub enum Architecture {
+    Unknown,
+    Aarch64,
+    #[allow(non_camel_case_types)]
+    Aarch64_Ilp32,
+    Arm,
+    Avr,
+    Bpf,
+    Csky,
+    I386,
+    X86_64,
+    #[allow(non_camel_case_types)]
+    X86_64_X32,
+    Hexagon,
+    LoongArch64,
+    Mips,
+    Mips64,
+    Msp430,
+    PowerPc,
+    PowerPc64,
+    Riscv32,
+    Riscv64,
+    S390x,
+    Sbf,
+    Sharc,
+    Sparc64,
+    Wasm32,
+    Wasm64,
+    Xtensa,
+}
+
+/// A CPU sub-architecture.
+#[allow(missing_docs)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[non_exhaustive]
+pub enum SubArchitecture {
+    Arm64E,
+    Arm64EC,
+}
+
+impl Architecture {
+    /// The size of an address value for this architecture.
+    ///
+    /// Returns `None` for unknown architectures.
+    pub fn address_size(self) -> Option<AddressSize> {
+        match self {
+            Architecture::Unknown => None,
+            Architecture::Aarch64 => Some(AddressSize::U64),
+            Architecture::Aarch64_Ilp32 => Some(AddressSize::U32),
+            Architecture::Arm => Some(AddressSize::U32),
+            Architecture::Avr => Some(AddressSize::U8),
+            Architecture::Bpf => Some(AddressSize::U64),
+            Architecture::Csky => Some(AddressSize::U32),
+            Architecture::I386 => Some(AddressSize::U32),
+            Architecture::X86_64 => Some(AddressSize::U64),
+            Architecture::X86_64_X32 => Some(AddressSize::U32),
+            Architecture::Hexagon => Some(AddressSize::U32),
+            Architecture::LoongArch64 => Some(AddressSize::U64),
+            Architecture::Mips => Some(AddressSize::U32),
+            Architecture::Mips64 => Some(AddressSize::U64),
+            Architecture::Msp430 => Some(AddressSize::U16),
+            Architecture::PowerPc => Some(AddressSize::U32),
+            Architecture::PowerPc64 => Some(AddressSize::U64),
+            Architecture::Riscv32 => Some(AddressSize::U32),
+            Architecture::Riscv64 => Some(AddressSize::U64),
+            Architecture::S390x => Some(AddressSize::U64),
+            Architecture::Sbf => Some(AddressSize::U64),
+            Architecture::Sharc => Some(AddressSize::U32),
+            Architecture::Sparc64 => Some(AddressSize::U64),
+            Architecture::Wasm32 => Some(AddressSize::U32),
+            Architecture::Wasm64 => Some(AddressSize::U64),
+            Architecture::Xtensa => Some(AddressSize::U32),
+        }
+    }
+}
+
+/// The size of an address value for an architecture.
+///
+/// This may differ from the address size supported by the file format (such as for COFF).
+#[allow(missing_docs)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[non_exhaustive]
+#[repr(u8)]
+pub enum AddressSize {
+    U8 = 1,
+    U16 = 2,
+    U32 = 4,
+    U64 = 8,
+}
+
+impl AddressSize {
+    /// The size in bytes of an address value.
+    #[inline]
+    pub fn bytes(self) -> u8 {
+        self as u8
+    }
+}
+
+/// A binary file format.
+#[allow(missing_docs)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[non_exhaustive]
+pub enum BinaryFormat {
+    Coff,
+    Elf,
+    MachO,
+    Pe,
+    Wasm,
+    Xcoff,
+}
+
+/// The kind of a section.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[non_exhaustive]
+pub enum SectionKind {
+    /// The section kind is unknown.
+    Unknown,
+    /// An executable code section.
+    ///
+    /// Example ELF sections: `.text`
+    ///
+    /// Example Mach-O sections: `__TEXT/__text`
+    Text,
+    /// A data section.
+    ///
+    /// Example ELF sections: `.data`
+    ///
+    /// Example Mach-O sections: `__DATA/__data`
+    Data,
+    /// A read only data section.
+    ///
+    /// Example ELF sections: `.rodata`
+    ///
+    /// Example Mach-O sections: `__TEXT/__const`, `__DATA/__const`, `__TEXT/__literal4`
+    ReadOnlyData,
+    /// A read only data section with relocations.
+    ///
+    /// This is the same as either `Data` or `ReadOnlyData`, depending on the file format.
+    /// This value is only used in the API for writing files. It is never returned when reading files.
+    ReadOnlyDataWithRel,
+    /// A loadable string section.
+    ///
+    /// Example ELF sections: `.rodata.str`
+    ///
+    /// Example Mach-O sections: `__TEXT/__cstring`
+    ReadOnlyString,
+    /// An uninitialized data section.
+    ///
+    /// Example ELF sections: `.bss`
+    ///
+    /// Example Mach-O sections: `__DATA/__bss`
+    UninitializedData,
+    /// An uninitialized common data section.
+    ///
+    /// Example Mach-O sections: `__DATA/__common`
+    Common,
+    /// A TLS data section.
+    ///
+    /// Example ELF sections: `.tdata`
+    ///
+    /// Example Mach-O sections: `__DATA/__thread_data`
+    Tls,
+    /// An uninitialized TLS data section.
+    ///
+    /// Example ELF sections: `.tbss`
+    ///
+    /// Example Mach-O sections: `__DATA/__thread_bss`
+    UninitializedTls,
+    /// A TLS variables section.
+    ///
+    /// This contains TLS variable structures, rather than the variable initializers.
+    ///
+    /// Example Mach-O sections: `__DATA/__thread_vars`
+    TlsVariables,
+    /// A non-loadable string section.
+    ///
+    /// Example ELF sections: `.comment`, `.debug_str`
+    OtherString,
+    /// Some other non-loadable section.
+    ///
+    /// Example ELF sections: `.debug_info`
+    Other,
+    /// Debug information.
+    ///
+    /// Example Mach-O sections: `__DWARF/__debug_info`
+    Debug,
+    /// Information for the linker.
+    ///
+    /// Example COFF sections: `.drectve`
+    Linker,
+    /// ELF note section.
+    Note,
+    /// Metadata such as symbols or relocations.
+    ///
+    /// Example ELF sections: `.symtab`, `.strtab`, `.group`
+    Metadata,
+    /// Some other ELF section type.
+    ///
+    /// This is the `sh_type` field in the section header.
+    /// The meaning may be dependent on the architecture.
+    Elf(u32),
+}
+
+impl SectionKind {
+    /// Return true if this section contains zerofill data.
+    pub fn is_bss(self) -> bool {
+        self == SectionKind::UninitializedData
+            || self == SectionKind::UninitializedTls
+            || self == SectionKind::Common
+    }
+}
+
+/// The selection kind for a COMDAT section group.
+///
+/// This determines the way in which the linker resolves multiple definitions of the COMDAT
+/// sections.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[non_exhaustive]
+pub enum ComdatKind {
+    /// The selection kind is unknown.
+    Unknown,
+    /// Multiple definitions are allowed.
+    ///
+    /// An arbitrary definition is selected, and the rest are removed.
+    ///
+    /// This is the only supported selection kind for ELF.
+    Any,
+    /// Multiple definitions are not allowed.
+    ///
+    /// This is used to group sections without allowing duplicates.
+    NoDuplicates,
+    /// Multiple definitions must have the same size.
+    ///
+    /// An arbitrary definition is selected, and the rest are removed.
+    SameSize,
+    /// Multiple definitions must match exactly.
+    ///
+    /// An arbitrary definition is selected, and the rest are removed.
+    ExactMatch,
+    /// Multiple definitions are allowed, and the largest is selected.
+    ///
+    /// An arbitrary definition with the largest size is selected, and the rest are removed.
+    Largest,
+    /// Multiple definitions are allowed, and the newest is selected.
+    Newest,
+}
+
+/// The kind of a symbol.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[non_exhaustive]
+pub enum SymbolKind {
+    /// The symbol kind is unknown.
+    Unknown,
+    /// The symbol is a null placeholder.
+    Null,
+    /// The symbol is for executable code.
+    Text,
+    /// The symbol is for a data object.
+    Data,
+    /// The symbol is for a section.
+    Section,
+    /// The symbol is the name of a file. It precedes symbols within that file.
+    File,
+    /// The symbol is for a code label.
+    Label,
+    /// The symbol is for a thread local storage entity.
+    Tls,
+}
+
+/// A symbol scope.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub enum SymbolScope {
+    /// Unknown scope.
+    Unknown,
+    /// Symbol is visible to the compilation unit.
+    Compilation,
+    /// Symbol is visible to the static linkage unit.
+    Linkage,
+    /// Symbol is visible to dynamically linked objects.
+    Dynamic,
+}
+
+/// The operation used to calculate the result of the relocation.
+///
+/// The relocation descriptions use the following definitions. Note that
+/// these definitions probably don't match any ELF ABI.
+///
+/// * A - The value of the addend.
+/// * G - The address of the symbol's entry within the global offset table.
+/// * L - The address of the symbol's entry within the procedure linkage table.
+/// * P - The address of the place of the relocation.
+/// * S - The address of the symbol.
+/// * GotBase - The address of the global offset table.
+/// * Image - The base address of the image.
+/// * Section - The address of the section containing the symbol.
+///
+/// 'XxxRelative' means 'Xxx + A - P'.  'XxxOffset' means 'S + A - Xxx'.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[non_exhaustive]
+pub enum RelocationKind {
+    /// S + A
+    Absolute,
+    /// S + A - P
+    Relative,
+    /// G + A - GotBase
+    Got,
+    /// G + A - P
+    GotRelative,
+    /// GotBase + A - P
+    GotBaseRelative,
+    /// S + A - GotBase
+    GotBaseOffset,
+    /// L + A - P
+    PltRelative,
+    /// S + A - Image
+    ImageOffset,
+    /// S + A - Section
+    SectionOffset,
+    /// The index of the section containing the symbol.
+    SectionIndex,
+    /// Some other ELF relocation. The value is dependent on the architecture.
+    Elf(u32),
+    /// Some other Mach-O relocation. The value is dependent on the architecture.
+    MachO {
+        /// The relocation type.
+        value: u8,
+        /// Whether the relocation is relative to the place.
+        relative: bool,
+    },
+    /// Some other COFF relocation. The value is dependent on the architecture.
+    Coff(u16),
+    /// Some other XCOFF relocation.
+    Xcoff(u8),
+}
+
+/// Information about how the result of the relocation operation is encoded in the place.
+///
+/// This is usually architecture specific, such as specifying an addressing mode or
+/// a specific instruction.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[non_exhaustive]
+pub enum RelocationEncoding {
+    /// Generic encoding.
+    Generic,
+
+    /// x86 sign extension at runtime.
+    ///
+    /// Used with `RelocationKind::Absolute`.
+    X86Signed,
+    /// x86 rip-relative addressing.
+    ///
+    /// The `RelocationKind` must be PC relative.
+    X86RipRelative,
+    /// x86 rip-relative addressing in movq instruction.
+    ///
+    /// The `RelocationKind` must be PC relative.
+    X86RipRelativeMovq,
+    /// x86 branch instruction.
+    ///
+    /// The `RelocationKind` must be PC relative.
+    X86Branch,
+
+    /// s390x PC-relative offset shifted right by one bit.
+    ///
+    /// The `RelocationKind` must be PC relative.
+    S390xDbl,
+
+    /// AArch64 call target.
+    ///
+    /// The `RelocationKind` must be PC relative.
+    AArch64Call,
+
+    /// LoongArch branch offset with two trailing zeros.
+    ///
+    /// The `RelocationKind` must be PC relative.
+    LoongArchBranch,
+
+    /// SHARC+ 48-bit Type A instruction
+    ///
+    /// Represents these possible variants, each with a corresponding
+    /// `R_SHARC_*` constant:
+    ///
+    /// * 24-bit absolute address
+    /// * 32-bit absolute address
+    /// * 6-bit relative address
+    /// * 24-bit relative address
+    /// * 6-bit absolute address in the immediate value field
+    /// * 16-bit absolute address in the immediate value field
+    SharcTypeA,
+
+    /// SHARC+ 32-bit Type B instruction
+    ///
+    /// Represents these possible variants, each with a corresponding
+    /// `R_SHARC_*` constant:
+    ///
+    /// * 6-bit absolute address in the immediate value field
+    /// * 7-bit absolute address in the immediate value field
+    /// * 16-bit absolute address
+    /// * 6-bit relative address
+    SharcTypeB,
+}
+
+/// File flags that are specific to each file format.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[non_exhaustive]
+pub enum FileFlags {
+    /// No file flags.
+    None,
+    /// ELF file flags.
+    Elf {
+        /// `os_abi` field in the ELF file header.
+        os_abi: u8,
+        /// `abi_version` field in the ELF file header.
+        abi_version: u8,
+        /// `e_flags` field in the ELF file header.
+        e_flags: u32,
+    },
+    /// Mach-O file flags.
+    MachO {
+        /// `flags` field in the Mach-O file header.
+        flags: u32,
+    },
+    /// COFF file flags.
+    Coff {
+        /// `Characteristics` field in the COFF file header.
+        characteristics: u16,
+    },
+    /// XCOFF file flags.
+    Xcoff {
+        /// `f_flags` field in the XCOFF file header.
+        f_flags: u16,
+    },
+}
+
+/// Segment flags that are specific to each file format.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[non_exhaustive]
+pub enum SegmentFlags {
+    /// No segment flags.
+    None,
+    /// ELF segment flags.
+    Elf {
+        /// `p_flags` field in the segment header.
+        p_flags: u32,
+    },
+    /// Mach-O segment flags.
+    MachO {
+        /// `flags` field in the segment header.
+        flags: u32,
+        /// `maxprot` field in the segment header.
+        maxprot: u32,
+        /// `initprot` field in the segment header.
+        initprot: u32,
+    },
+    /// COFF segment flags.
+    Coff {
+        /// `Characteristics` field in the segment header.
+        characteristics: u32,
+    },
+}
+
+/// Section flags that are specific to each file format.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[non_exhaustive]
+pub enum SectionFlags {
+    /// No section flags.
+    None,
+    /// ELF section flags.
+    Elf {
+        /// `sh_flags` field in the section header.
+        sh_flags: u64,
+    },
+    /// Mach-O section flags.
+    MachO {
+        /// `flags` field in the section header.
+        flags: u32,
+    },
+    /// COFF section flags.
+    Coff {
+        /// `Characteristics` field in the section header.
+        characteristics: u32,
+    },
+    /// XCOFF section flags.
+    Xcoff {
+        /// `s_flags` field in the section header.
+        s_flags: u32,
+    },
+}
+
+/// Symbol flags that are specific to each file format.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[non_exhaustive]
+pub enum SymbolFlags<Section, Symbol> {
+    /// No symbol flags.
+    None,
+    /// ELF symbol flags.
+    Elf {
+        /// `st_info` field in the ELF symbol.
+        st_info: u8,
+        /// `st_other` field in the ELF symbol.
+        st_other: u8,
+    },
+    /// Mach-O symbol flags.
+    MachO {
+        /// `n_desc` field in the Mach-O symbol.
+        n_desc: u16,
+    },
+    /// COFF flags for a section symbol.
+    CoffSection {
+        /// `Selection` field in the auxiliary symbol for the section.
+        selection: u8,
+        /// `Number` field in the auxiliary symbol for the section.
+        associative_section: Option<Section>,
+    },
+    /// XCOFF symbol flags.
+    Xcoff {
+        /// `n_sclass` field in the XCOFF symbol.
+        n_sclass: u8,
+        /// `x_smtyp` field in the CSECT auxiliary symbol.
+        ///
+        /// Only valid if `n_sclass` is `C_EXT`, `C_WEAKEXT`, or `C_HIDEXT`.
+        x_smtyp: u8,
+        /// `x_smclas` field in the CSECT auxiliary symbol.
+        ///
+        /// Only valid if `n_sclass` is `C_EXT`, `C_WEAKEXT`, or `C_HIDEXT`.
+        x_smclas: u8,
+        /// The containing csect for the symbol.
+        ///
+        /// Only valid if `x_smtyp` is `XTY_LD`.
+        containing_csect: Option<Symbol>,
+    },
+}

vendor/object/src/endian.rs

@@ -0,0 +1,831 @@
+//! Types for compile-time and run-time endianness.
+
+use crate::pod::Pod;
+use core::fmt::{self, Debug};
+use core::marker::PhantomData;
+
+/// A trait for using an endianness specification.
+///
+/// Provides methods for converting between the specified endianness and
+/// the native endianness of the target machine.
+///
+/// This trait does not require that the endianness is known at compile time.
+pub trait Endian: Debug + Default + Clone + Copy + PartialEq + Eq + 'static {
+    /// Construct a specification for the endianness of some values.
+    ///
+    /// Returns `None` if the type does not support specifying the given endianness.
+    fn from_big_endian(big_endian: bool) -> Option<Self>;
+
+    /// Construct a specification for the endianness of some values.
+    ///
+    /// Returns `None` if the type does not support specifying the given endianness.
+    fn from_little_endian(little_endian: bool) -> Option<Self> {
+        Self::from_big_endian(!little_endian)
+    }
+
+    /// Return true for big endian byte order.
+    fn is_big_endian(self) -> bool;
+
+    /// Return true for little endian byte order.
+    #[inline]
+    fn is_little_endian(self) -> bool {
+        !self.is_big_endian()
+    }
+
+    /// Converts an unsigned 16 bit integer to native endian.
+    #[inline]
+    fn read_u16(self, n: u16) -> u16 {
+        if self.is_big_endian() {
+            u16::from_be(n)
+        } else {
+            u16::from_le(n)
+        }
+    }
+
+    /// Converts an unsigned 32 bit integer to native endian.
+    #[inline]
+    fn read_u32(self, n: u32) -> u32 {
+        if self.is_big_endian() {
+            u32::from_be(n)
+        } else {
+            u32::from_le(n)
+        }
+    }
+
+    /// Converts an unsigned 64 bit integer to native endian.
+    #[inline]
+    fn read_u64(self, n: u64) -> u64 {
+        if self.is_big_endian() {
+            u64::from_be(n)
+        } else {
+            u64::from_le(n)
+        }
+    }
+
+    /// Converts a signed 16 bit integer to native endian.
+    #[inline]
+    fn read_i16(self, n: i16) -> i16 {
+        if self.is_big_endian() {
+            i16::from_be(n)
+        } else {
+            i16::from_le(n)
+        }
+    }
+
+    /// Converts a signed 32 bit integer to native endian.
+    #[inline]
+    fn read_i32(self, n: i32) -> i32 {
+        if self.is_big_endian() {
+            i32::from_be(n)
+        } else {
+            i32::from_le(n)
+        }
+    }
+
+    /// Converts a signed 64 bit integer to native endian.
+    #[inline]
+    fn read_i64(self, n: i64) -> i64 {
+        if self.is_big_endian() {
+            i64::from_be(n)
+        } else {
+            i64::from_le(n)
+        }
+    }
+
+    /// Converts an unaligned unsigned 16 bit integer to native endian.
+    #[inline]
+    fn read_u16_bytes(self, n: [u8; 2]) -> u16 {
+        if self.is_big_endian() {
+            u16::from_be_bytes(n)
+        } else {
+            u16::from_le_bytes(n)
+        }
+    }
+
+    /// Converts an unaligned unsigned 32 bit integer to native endian.
+    #[inline]
+    fn read_u32_bytes(self, n: [u8; 4]) -> u32 {
+        if self.is_big_endian() {
+            u32::from_be_bytes(n)
+        } else {
+            u32::from_le_bytes(n)
+        }
+    }
+
+    /// Converts an unaligned unsigned 64 bit integer to native endian.
+    #[inline]
+    fn read_u64_bytes(self, n: [u8; 8]) -> u64 {
+        if self.is_big_endian() {
+            u64::from_be_bytes(n)
+        } else {
+            u64::from_le_bytes(n)
+        }
+    }
+
+    /// Converts an unaligned signed 16 bit integer to native endian.
+    #[inline]
+    fn read_i16_bytes(self, n: [u8; 2]) -> i16 {
+        if self.is_big_endian() {
+            i16::from_be_bytes(n)
+        } else {
+            i16::from_le_bytes(n)
+        }
+    }
+
+    /// Converts an unaligned signed 32 bit integer to native endian.
+    #[inline]
+    fn read_i32_bytes(self, n: [u8; 4]) -> i32 {
+        if self.is_big_endian() {
+            i32::from_be_bytes(n)
+        } else {
+            i32::from_le_bytes(n)
+        }
+    }
+
+    /// Converts an unaligned signed 64 bit integer to native endian.
+    #[inline]
+    fn read_i64_bytes(self, n: [u8; 8]) -> i64 {
+        if self.is_big_endian() {
+            i64::from_be_bytes(n)
+        } else {
+            i64::from_le_bytes(n)
+        }
+    }
+
+    /// Converts an unsigned 16 bit integer from native endian.
+    #[inline]
+    fn write_u16(self, n: u16) -> u16 {
+        if self.is_big_endian() {
+            u16::to_be(n)
+        } else {
+            u16::to_le(n)
+        }
+    }
+
+    /// Converts an unsigned 32 bit integer from native endian.
+    #[inline]
+    fn write_u32(self, n: u32) -> u32 {
+        if self.is_big_endian() {
+            u32::to_be(n)
+        } else {
+            u32::to_le(n)
+        }
+    }
+
+    /// Converts an unsigned 64 bit integer from native endian.
+    #[inline]
+    fn write_u64(self, n: u64) -> u64 {
+        if self.is_big_endian() {
+            u64::to_be(n)
+        } else {
+            u64::to_le(n)
+        }
+    }
+
+    /// Converts a signed 16 bit integer from native endian.
+    #[inline]
+    fn write_i16(self, n: i16) -> i16 {
+        if self.is_big_endian() {
+            i16::to_be(n)
+        } else {
+            i16::to_le(n)
+        }
+    }
+
+    /// Converts a signed 32 bit integer from native endian.
+    #[inline]
+    fn write_i32(self, n: i32) -> i32 {
+        if self.is_big_endian() {
+            i32::to_be(n)
+        } else {
+            i32::to_le(n)
+        }
+    }
+
+    /// Converts a signed 64 bit integer from native endian.
+    #[inline]
+    fn write_i64(self, n: i64) -> i64 {
+        if self.is_big_endian() {
+            i64::to_be(n)
+        } else {
+            i64::to_le(n)
+        }
+    }
+
+    /// Converts an unaligned unsigned 16 bit integer from native endian.
+    #[inline]
+    fn write_u16_bytes(self, n: u16) -> [u8; 2] {
+        if self.is_big_endian() {
+            u16::to_be_bytes(n)
+        } else {
+            u16::to_le_bytes(n)
+        }
+    }
+
+    /// Converts an unaligned unsigned 32 bit integer from native endian.
+    #[inline]
+    fn write_u32_bytes(self, n: u32) -> [u8; 4] {
+        if self.is_big_endian() {
+            u32::to_be_bytes(n)
+        } else {
+            u32::to_le_bytes(n)
+        }
+    }
+
+    /// Converts an unaligned unsigned 64 bit integer from native endian.
+    #[inline]
+    fn write_u64_bytes(self, n: u64) -> [u8; 8] {
+        if self.is_big_endian() {
+            u64::to_be_bytes(n)
+        } else {
+            u64::to_le_bytes(n)
+        }
+    }
+
+    /// Converts an unaligned signed 16 bit integer from native endian.
+    #[inline]
+    fn write_i16_bytes(self, n: i16) -> [u8; 2] {
+        if self.is_big_endian() {
+            i16::to_be_bytes(n)
+        } else {
+            i16::to_le_bytes(n)
+        }
+    }
+
+    /// Converts an unaligned signed 32 bit integer from native endian.
+    #[inline]
+    fn write_i32_bytes(self, n: i32) -> [u8; 4] {
+        if self.is_big_endian() {
+            i32::to_be_bytes(n)
+        } else {
+            i32::to_le_bytes(n)
+        }
+    }
+
+    /// Converts an unaligned signed 64 bit integer from native endian.
+    #[inline]
+    fn write_i64_bytes(self, n: i64) -> [u8; 8] {
+        if self.is_big_endian() {
+            i64::to_be_bytes(n)
+        } else {
+            i64::to_le_bytes(n)
+        }
+    }
+}
+
+/// An endianness that is selectable at run-time.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub enum Endianness {
+    /// Little endian byte order.
+    Little,
+    /// Big endian byte order.
+    Big,
+}
+
+impl Default for Endianness {
+    #[cfg(target_endian = "little")]
+    #[inline]
+    fn default() -> Endianness {
+        Endianness::Little
+    }
+
+    #[cfg(target_endian = "big")]
+    #[inline]
+    fn default() -> Endianness {
+        Endianness::Big
+    }
+}
+
+impl Endian for Endianness {
+    #[inline]
+    fn from_big_endian(big_endian: bool) -> Option<Self> {
+        Some(if big_endian {
+            Endianness::Big
+        } else {
+            Endianness::Little
+        })
+    }
+
+    #[inline]
+    fn is_big_endian(self) -> bool {
+        self != Endianness::Little
+    }
+}
+
+/// Compile-time little endian byte order.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct LittleEndian;
+
+impl Default for LittleEndian {
+    #[inline]
+    fn default() -> LittleEndian {
+        LittleEndian
+    }
+}
+
+impl Endian for LittleEndian {
+    #[inline]
+    fn from_big_endian(big_endian: bool) -> Option<Self> {
+        if big_endian {
+            None
+        } else {
+            Some(LittleEndian)
+        }
+    }
+
+    #[inline]
+    fn is_big_endian(self) -> bool {
+        false
+    }
+}
+
+/// Compile-time big endian byte order.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct BigEndian;
+
+impl Default for BigEndian {
+    #[inline]
+    fn default() -> BigEndian {
+        BigEndian
+    }
+}
+
+impl Endian for BigEndian {
+    #[inline]
+    fn from_big_endian(big_endian: bool) -> Option<Self> {
+        if big_endian {
+            Some(BigEndian)
+        } else {
+            None
+        }
+    }
+
+    #[inline]
+    fn is_big_endian(self) -> bool {
+        true
+    }
+}
+
+/// The native endianness for the target platform.
+#[cfg(target_endian = "little")]
+pub type NativeEndian = LittleEndian;
+
+#[cfg(target_endian = "little")]
+#[allow(non_upper_case_globals)]
+#[doc(hidden)]
+pub const NativeEndian: LittleEndian = LittleEndian;
+
+/// The native endianness for the target platform.
+#[cfg(target_endian = "big")]
+pub type NativeEndian = BigEndian;
+
+#[cfg(target_endian = "big")]
+#[allow(non_upper_case_globals)]
+#[doc(hidden)]
+pub const NativeEndian: BigEndian = BigEndian;
+
+macro_rules! unsafe_impl_endian_pod {
+    ($($struct_name:ident),+ $(,)?) => {
+        $(
+            unsafe impl<E: Endian> Pod for $struct_name<E> { }
+        )+
+    }
+}
+
+#[cfg(not(feature = "unaligned"))]
+mod aligned {
+    use super::{fmt, Endian, PhantomData, Pod};
+
+    /// A `u16` value with an externally specified endianness of type `E`.
+    #[derive(Default, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+    #[repr(transparent)]
+    pub struct U16<E: Endian>(u16, PhantomData<E>);
+
+    impl<E: Endian> U16<E> {
+        /// Construct a new value given bytes that already have the required endianness.
+        pub fn from_bytes(n: [u8; 2]) -> Self {
+            Self(u16::from_ne_bytes(n), PhantomData)
+        }
+
+        /// Construct a new value given a native endian value.
+        pub fn new(e: E, n: u16) -> Self {
+            Self(e.write_u16(n), PhantomData)
+        }
+
+        /// Return the value as a native endian value.
+        pub fn get(self, e: E) -> u16 {
+            e.read_u16(self.0)
+        }
+
+        /// Set the value given a native endian value.
+        pub fn set(&mut self, e: E, n: u16) {
+            self.0 = e.write_u16(n);
+        }
+    }
+
+    /// A `u32` value with an externally specified endianness of type `E`.
+    #[derive(Default, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+    #[repr(transparent)]
+    pub struct U32<E: Endian>(u32, PhantomData<E>);
+
+    impl<E: Endian> U32<E> {
+        /// Construct a new value given bytes that already have the required endianness.
+        pub fn from_bytes(n: [u8; 4]) -> Self {
+            Self(u32::from_ne_bytes(n), PhantomData)
+        }
+
+        /// Construct a new value given a native endian value.
+        pub fn new(e: E, n: u32) -> Self {
+            Self(e.write_u32(n), PhantomData)
+        }
+        /// Return the value as a native endian value.
+        pub fn get(self, e: E) -> u32 {
+            e.read_u32(self.0)
+        }
+        /// Set the value given a native endian value.
+        pub fn set(&mut self, e: E, n: u32) {
+            self.0 = e.write_u32(n);
+        }
+    }
+
+    /// A `u64` value with an externally specified endianness of type `E`.
+    #[derive(Default, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+    #[repr(transparent)]
+    pub struct U64<E: Endian>(u64, PhantomData<E>);
+
+    impl<E: Endian> U64<E> {
+        /// Construct a new value given bytes that already have the required endianness.
+        pub fn from_bytes(n: [u8; 8]) -> Self {
+            Self(u64::from_ne_bytes(n), PhantomData)
+        }
+
+        /// Construct a new value given a native endian value.
+        pub fn new(e: E, n: u64) -> Self {
+            Self(e.write_u64(n), PhantomData)
+        }
+        /// Return the value as a native endian value.
+        pub fn get(self, e: E) -> u64 {
+            e.read_u64(self.0)
+        }
+        /// Set the value given a native endian value.
+        pub fn set(&mut self, e: E, n: u64) {
+            self.0 = e.write_u64(n);
+        }
+    }
+
+    /// An `i16` value with an externally specified endianness of type `E`.
+    #[derive(Default, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+    #[repr(transparent)]
+    pub struct I16<E: Endian>(i16, PhantomData<E>);
+
+    impl<E: Endian> I16<E> {
+        /// Construct a new value given bytes that already have the required endianness.
+        pub fn from_bytes(n: [u8; 2]) -> Self {
+            Self(i16::from_ne_bytes(n), PhantomData)
+        }
+
+        /// Construct a new value given a native endian value.
+        pub fn new(e: E, n: i16) -> Self {
+            Self(e.write_i16(n), PhantomData)
+        }
+        /// Return the value as a native endian value.
+        pub fn get(self, e: E) -> i16 {
+            e.read_i16(self.0)
+        }
+        /// Set the value given a native endian value.
+        pub fn set(&mut self, e: E, n: i16) {
+            self.0 = e.write_i16(n);
+        }
+    }
+
+    /// An `i32` value with an externally specified endianness of type `E`.
+    #[derive(Default, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+    #[repr(transparent)]
+    pub struct I32<E: Endian>(i32, PhantomData<E>);
+
+    impl<E: Endian> I32<E> {
+        /// Construct a new value given bytes that already have the required endianness.
+        pub fn from_bytes(n: [u8; 4]) -> Self {
+            Self(i32::from_ne_bytes(n), PhantomData)
+        }
+
+        /// Construct a new value given a native endian value.
+        pub fn new(e: E, n: i32) -> Self {
+            Self(e.write_i32(n), PhantomData)
+        }
+        /// Return the value as a native endian value.
+        pub fn get(self, e: E) -> i32 {
+            e.read_i32(self.0)
+        }
+        /// Set the value given a native endian value.
+        pub fn set(&mut self, e: E, n: i32) {
+            self.0 = e.write_i32(n);
+        }
+    }
+
+    /// An `i64` value with an externally specified endianness of type `E`.
+    #[derive(Default, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+    #[repr(transparent)]
+    pub struct I64<E: Endian>(i64, PhantomData<E>);
+
+    impl<E: Endian> I64<E> {
+        /// Construct a new value given bytes that already have the required endianness.
+        pub fn from_bytes(n: [u8; 8]) -> Self {
+            Self(i64::from_ne_bytes(n), PhantomData)
+        }
+
+        /// Construct a new value given a native endian value.
+        pub fn new(e: E, n: i64) -> Self {
+            Self(e.write_i64(n), PhantomData)
+        }
+        /// Return the value as a native endian value.
+        pub fn get(self, e: E) -> i64 {
+            e.read_i64(self.0)
+        }
+        /// Set the value given a native endian value.
+        pub fn set(&mut self, e: E, n: i64) {
+            self.0 = e.write_i64(n);
+        }
+    }
+
+    impl<E: Endian> fmt::Debug for U16<E> {
+        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+            write!(f, "U16({:x})", self.0)
+        }
+    }
+
+    impl<E: Endian> fmt::Debug for U32<E> {
+        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+            write!(f, "U32({:x})", self.0)
+        }
+    }
+
+    impl<E: Endian> fmt::Debug for U64<E> {
+        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+            write!(f, "U64({:x})", self.0)
+        }
+    }
+
+    impl<E: Endian> fmt::Debug for I16<E> {
+        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+            write!(f, "I16({:x})", self.0)
+        }
+    }
+
+    impl<E: Endian> fmt::Debug for I32<E> {
+        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+            write!(f, "I32({:x})", self.0)
+        }
+    }
+
+    impl<E: Endian> fmt::Debug for I64<E> {
+        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+            write!(f, "I64({:x})", self.0)
+        }
+    }
+
+    unsafe_impl_endian_pod!(U16, U32, U64, I16, I32, I64);
+}
+
+#[cfg(not(feature = "unaligned"))]
+pub use aligned::*;
+
+/// A `u16` value with an externally specified endianness of type `E`.
+#[cfg(feature = "unaligned")]
+pub type U16<E> = U16Bytes<E>;
+
+/// A `u32` value with an externally specified endianness of type `E`.
+#[cfg(feature = "unaligned")]
+pub type U32<E> = U32Bytes<E>;
+
+/// A `u64` value with an externally specified endianness of type `E`.
+#[cfg(feature = "unaligned")]
+pub type U64<E> = U64Bytes<E>;
+
+/// An `i16` value with an externally specified endianness of type `E`.
+#[cfg(feature = "unaligned")]
+pub type I16<E> = I16Bytes<E>;
+
+/// An `i32` value with an externally specified endianness of type `E`.
+#[cfg(feature = "unaligned")]
+pub type I32<E> = I32Bytes<E>;
+
+/// An `i64` value with an externally specified endianness of type `E`.
+#[cfg(feature = "unaligned")]
+pub type I64<E> = I64Bytes<E>;
+
+/// An unaligned `u16` value with an externally specified endianness of type `E`.
+#[derive(Default, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[repr(transparent)]
+pub struct U16Bytes<E: Endian>([u8; 2], PhantomData<E>);
+
+impl<E: Endian> U16Bytes<E> {
+    /// Construct a new value given bytes that already have the required endianness.
+    pub fn from_bytes(n: [u8; 2]) -> Self {
+        Self(n, PhantomData)
+    }
+
+    /// Construct a new value given a native endian value.
+    pub fn new(e: E, n: u16) -> Self {
+        Self(e.write_u16_bytes(n), PhantomData)
+    }
+
+    /// Return the value as a native endian value.
+    pub fn get(self, e: E) -> u16 {
+        e.read_u16_bytes(self.0)
+    }
+
+    /// Set the value given a native endian value.
+    pub fn set(&mut self, e: E, n: u16) {
+        self.0 = e.write_u16_bytes(n);
+    }
+}
+
+/// An unaligned `u32` value with an externally specified endianness of type `E`.
+#[derive(Default, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[repr(transparent)]
+pub struct U32Bytes<E: Endian>([u8; 4], PhantomData<E>);
+
+impl<E: Endian> U32Bytes<E> {
+    /// Construct a new value given bytes that already have the required endianness.
+    pub fn from_bytes(n: [u8; 4]) -> Self {
+        Self(n, PhantomData)
+    }
+
+    /// Construct a new value given a native endian value.
+    pub fn new(e: E, n: u32) -> Self {
+        Self(e.write_u32_bytes(n), PhantomData)
+    }
+
+    /// Return the value as a native endian value.
+    pub fn get(self, e: E) -> u32 {
+        e.read_u32_bytes(self.0)
+    }
+
+    /// Set the value given a native endian value.
+    pub fn set(&mut self, e: E, n: u32) {
+        self.0 = e.write_u32_bytes(n);
+    }
+}
+
+/// An unaligned `u64` value with an externally specified endianness of type `E`.
+#[derive(Default, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[repr(transparent)]
+pub struct U64Bytes<E: Endian>([u8; 8], PhantomData<E>);
+
+impl<E: Endian> U64Bytes<E> {
+    /// Construct a new value given bytes that already have the required endianness.
+    pub fn from_bytes(n: [u8; 8]) -> Self {
+        Self(n, PhantomData)
+    }
+
+    /// Construct a new value given a native endian value.
+    pub fn new(e: E, n: u64) -> Self {
+        Self(e.write_u64_bytes(n), PhantomData)
+    }
+
+    /// Return the value as a native endian value.
+    pub fn get(self, e: E) -> u64 {
+        e.read_u64_bytes(self.0)
+    }
+
+    /// Set the value given a native endian value.
+    pub fn set(&mut self, e: E, n: u64) {
+        self.0 = e.write_u64_bytes(n);
+    }
+}
+
+/// An unaligned `i16` value with an externally specified endianness of type `E`.
+#[derive(Default, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[repr(transparent)]
+pub struct I16Bytes<E: Endian>([u8; 2], PhantomData<E>);
+
+impl<E: Endian> I16Bytes<E> {
+    /// Construct a new value given bytes that already have the required endianness.
+    pub fn from_bytes(n: [u8; 2]) -> Self {
+        Self(n, PhantomData)
+    }
+
+    /// Construct a new value given a native endian value.
+    pub fn new(e: E, n: i16) -> Self {
+        Self(e.write_i16_bytes(n), PhantomData)
+    }
+
+    /// Return the value as a native endian value.
+    pub fn get(self, e: E) -> i16 {
+        e.read_i16_bytes(self.0)
+    }
+
+    /// Set the value given a native endian value.
+    pub fn set(&mut self, e: E, n: i16) {
+        self.0 = e.write_i16_bytes(n);
+    }
+}
+
+/// An unaligned `i32` value with an externally specified endianness of type `E`.
+#[derive(Default, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[repr(transparent)]
+pub struct I32Bytes<E: Endian>([u8; 4], PhantomData<E>);
+
+impl<E: Endian> I32Bytes<E> {
+    /// Construct a new value given bytes that already have the required endianness.
+    pub fn from_bytes(n: [u8; 4]) -> Self {
+        Self(n, PhantomData)
+    }
+
+    /// Construct a new value given a native endian value.
+    pub fn new(e: E, n: i32) -> Self {
+        Self(e.write_i32_bytes(n), PhantomData)
+    }
+
+    /// Return the value as a native endian value.
+    pub fn get(self, e: E) -> i32 {
+        e.read_i32_bytes(self.0)
+    }
+
+    /// Set the value given a native endian value.
+    pub fn set(&mut self, e: E, n: i32) {
+        self.0 = e.write_i32_bytes(n);
+    }
+}
+
+/// An unaligned `i64` value with an externally specified endianness of type `E`.
+#[derive(Default, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[repr(transparent)]
+pub struct I64Bytes<E: Endian>([u8; 8], PhantomData<E>);
+
+impl<E: Endian> I64Bytes<E> {
+    /// Construct a new value given bytes that already have the required endianness.
+    pub fn from_bytes(n: [u8; 8]) -> Self {
+        Self(n, PhantomData)
+    }
+
+    /// Construct a new value given a native endian value.
+    pub fn new(e: E, n: i64) -> Self {
+        Self(e.write_i64_bytes(n), PhantomData)
+    }
+
+    /// Return the value as a native endian value.
+    pub fn get(self, e: E) -> i64 {
+        e.read_i64_bytes(self.0)
+    }
+
+    /// Set the value given a native endian value.
+    pub fn set(&mut self, e: E, n: i64) {
+        self.0 = e.write_i64_bytes(n);
+    }
+}
+
+impl<E: Endian> fmt::Debug for U16Bytes<E> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "U16({:x}, {:x})", self.0[0], self.0[1],)
+    }
+}
+
+impl<E: Endian> fmt::Debug for U32Bytes<E> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "U32({:x}, {:x}, {:x}, {:x})",
+            self.0[0], self.0[1], self.0[2], self.0[3],
+        )
+    }
+}
+
+impl<E: Endian> fmt::Debug for U64Bytes<E> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "U64({:x}, {:x}, {:x}, {:x}, {:x}, {:x}, {:x}, {:x})",
+            self.0[0], self.0[1], self.0[2], self.0[3], self.0[4], self.0[5], self.0[6], self.0[7],
+        )
+    }
+}
+
+impl<E: Endian> fmt::Debug for I16Bytes<E> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "I16({:x}, {:x})", self.0[0], self.0[1],)
+    }
+}
+
+impl<E: Endian> fmt::Debug for I32Bytes<E> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "I32({:x}, {:x}, {:x}, {:x})",
+            self.0[0], self.0[1], self.0[2], self.0[3],
+        )
+    }
+}
+
+impl<E: Endian> fmt::Debug for I64Bytes<E> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "I64({:x}, {:x}, {:x}, {:x}, {:x}, {:x}, {:x}, {:x})",
+            self.0[0], self.0[1], self.0[2], self.0[3], self.0[4], self.0[5], self.0[6], self.0[7],
+        )
+    }
+}
+
+unsafe_impl_endian_pod!(U16Bytes, U32Bytes, U64Bytes, I16Bytes, I32Bytes, I64Bytes);

vendor/object/src/lib.rs

@@ -0,0 +1,99 @@
+//! # `object`
+//!
+//! The `object` crate provides a unified interface to working with object files
+//! across platforms. It supports reading relocatable object files and executable files,
+//! and writing relocatable object files and some executable files.
+//!
+//! ## Raw struct definitions
+//!
+//! Raw structs are defined for: [ELF](elf), [Mach-O](macho), [PE/COFF](pe),
+//! [XCOFF](xcoff), [archive].
+//! Types and traits for zerocopy support are defined in the [`pod`] and [`endian`] modules.
+//!
+//! ## Unified read API
+//!
+//! The [`read`] module provides a unified read API using the [`read::Object`] trait.
+//! There is an implementation of this trait for [`read::File`], which allows reading any
+//! file format, as well as implementations for each file format.
+//!
+//! ## Low level read API
+//!
+//! The [`read#modules`] submodules define helpers that operate on the raw structs.
+//! These can be used instead of the unified API, or in conjunction with it to access
+//! details that are not available via the unified API.
+//!
+//! ## Unified write API
+//!
+//! The [`mod@write`] module provides a unified write API for relocatable object files
+//! using [`write::Object`]. This does not support writing executable files.
+//!
+//! ## Low level write API
+//!
+//! The [`mod@write#modules`] submodules define helpers for writing the raw structs.
+//!
+//! ## Shared definitions
+//!
+//! The crate provides a number of definitions that are used by both the read and write
+//! APIs. These are defined at the top level module, but none of these are the main entry
+//! points of the crate.
+
+#![deny(missing_docs)]
+#![deny(missing_debug_implementations)]
+#![no_std]
+#![warn(rust_2018_idioms)]
+// Style.
+#![allow(clippy::collapsible_if)]
+#![allow(clippy::comparison_chain)]
+#![allow(clippy::manual_flatten)]
+#![allow(clippy::match_like_matches_macro)]
+#![allow(clippy::single_match)]
+#![allow(clippy::type_complexity)]
+// Occurs due to fallible iteration.
+#![allow(clippy::should_implement_trait)]
+// Unit errors are converted to other types by callers.
+#![allow(clippy::result_unit_err)]
+// Worse readability sometimes.
+#![allow(clippy::collapsible_else_if)]
+
+#[cfg(feature = "cargo-all")]
+compile_error!("'--all-features' is not supported; use '--features all' instead");
+
+#[cfg(any(feature = "read_core", feature = "write_core"))]
+#[allow(unused_imports)]
+#[macro_use]
+extern crate alloc;
+
+#[cfg(feature = "std")]
+#[allow(unused_imports)]
+#[macro_use]
+extern crate std;
+
+mod common;
+pub use common::*;
+
+#[macro_use]
+pub mod endian;
+pub use endian::*;
+
+#[macro_use]
+pub mod pod;
+pub use pod::*;
+
+#[cfg(feature = "read_core")]
+pub mod read;
+#[cfg(feature = "read_core")]
+pub use read::*;
+
+#[cfg(feature = "write_core")]
+pub mod write;
+
+#[cfg(feature = "archive")]
+pub mod archive;
+#[cfg(feature = "elf")]
+pub mod elf;
+#[cfg(feature = "macho")]
+pub mod macho;
+#[cfg(any(feature = "coff", feature = "pe"))]
+pub mod pe;
+#[cfg(feature = "xcoff")]
+pub mod xcoff;

vendor/object/src/pod.rs

@@ -0,0 +1,239 @@
+//! Tools for converting file format structures to and from bytes.
+//!
+//! This module should be replaced once rust provides safe transmutes.
+
+// This module provides functions for both read and write features.
+#![cfg_attr(
+    not(all(feature = "read_core", feature = "write_core")),
+    allow(dead_code)
+)]
+
+use core::{mem, result, slice};
+
+type Result<T> = result::Result<T, ()>;
+
+/// A trait for types that can safely be converted from and to byte slices.
+///
+/// # Safety
+/// A type that is `Pod` must:
+/// - be `#[repr(C)]` or `#[repr(transparent)]`
+/// - have no invalid byte values
+/// - have no padding
+pub unsafe trait Pod: Copy + 'static {}
+
+/// Cast a byte slice to a `Pod` type.
+///
+/// Returns the type and the tail of the slice.
+#[inline]
+pub fn from_bytes<T: Pod>(data: &[u8]) -> Result<(&T, &[u8])> {
+    let size = mem::size_of::<T>();
+    let tail = data.get(size..).ok_or(())?;
+    let ptr = data.as_ptr();
+    if (ptr as usize) % mem::align_of::<T>() != 0 {
+        return Err(());
+    }
+    // Safety:
+    // The alignment and size are checked by this function.
+    // The Pod trait ensures the type is valid to cast from bytes.
+    let val = unsafe { &*ptr.cast() };
+    Ok((val, tail))
+}
+
+/// Cast a mutable byte slice to a `Pod` type.
+///
+/// Returns the type and the tail of the slice.
+#[inline]
+pub fn from_bytes_mut<T: Pod>(data: &mut [u8]) -> Result<(&mut T, &mut [u8])> {
+    let size = mem::size_of::<T>();
+    if size > data.len() {
+        return Err(());
+    }
+    let (data, tail) = data.split_at_mut(size);
+    let ptr = data.as_mut_ptr();
+    if (ptr as usize) % mem::align_of::<T>() != 0 {
+        return Err(());
+    }
+    // Safety:
+    // The alignment and size are checked by this function.
+    // The Pod trait ensures the type is valid to cast from bytes.
+    let val = unsafe { &mut *ptr.cast() };
+    Ok((val, tail))
+}
+
+/// Cast a byte slice to a slice of a `Pod` type.
+///
+/// Returns the type slice and the tail of the byte slice.
+#[inline]
+pub fn slice_from_bytes<T: Pod>(data: &[u8], count: usize) -> Result<(&[T], &[u8])> {
+    let size = count.checked_mul(mem::size_of::<T>()).ok_or(())?;
+    let tail = data.get(size..).ok_or(())?;
+    let ptr = data.as_ptr();
+    if (ptr as usize) % mem::align_of::<T>() != 0 {
+        return Err(());
+    }
+    // Safety:
+    // The alignment and size are checked by this function.
+    // The Pod trait ensures the type is valid to cast from bytes.
+    let slice = unsafe { slice::from_raw_parts(ptr.cast(), count) };
+    Ok((slice, tail))
+}
+
+/// Cast a mutable byte slice to a slice of a `Pod` type.
+///
+/// Returns the type slice and the tail of the byte slice.
+#[inline]
+pub fn slice_from_bytes_mut<T: Pod>(
+    data: &mut [u8],
+    count: usize,
+) -> Result<(&mut [T], &mut [u8])> {
+    let size = count.checked_mul(mem::size_of::<T>()).ok_or(())?;
+    if size > data.len() {
+        return Err(());
+    }
+    let (data, tail) = data.split_at_mut(size);
+    let ptr = data.as_mut_ptr();
+    if (ptr as usize) % mem::align_of::<T>() != 0 {
+        return Err(());
+    }
+    // Safety:
+    // The alignment and size are checked by this function.
+    // The Pod trait ensures the type is valid to cast from bytes.
+    let slice = unsafe { slice::from_raw_parts_mut(ptr.cast(), count) };
+    Ok((slice, tail))
+}
+
+/// Cast a `Pod` type to a byte slice.
+#[inline]
+pub fn bytes_of<T: Pod>(val: &T) -> &[u8] {
+    let size = mem::size_of::<T>();
+    // Safety:
+    // Any alignment is allowed.
+    // The size is determined in this function.
+    // The Pod trait ensures the type is valid to cast to bytes.
+    unsafe { slice::from_raw_parts(slice::from_ref(val).as_ptr().cast(), size) }
+}
+
+/// Cast a `Pod` type to a mutable byte slice.
+#[inline]
+pub fn bytes_of_mut<T: Pod>(val: &mut T) -> &mut [u8] {
+    let size = mem::size_of::<T>();
+    // Safety:
+    // Any alignment is allowed.
+    // The size is determined in this function.
+    // The Pod trait ensures the type is valid to cast to bytes.
+    unsafe { slice::from_raw_parts_mut(slice::from_mut(val).as_mut_ptr().cast(), size) }
+}
+
+/// Cast a slice of a `Pod` type to a byte slice.
+#[inline]
+pub fn bytes_of_slice<T: Pod>(val: &[T]) -> &[u8] {
+    let size = val.len().wrapping_mul(mem::size_of::<T>());
+    // Safety:
+    // Any alignment is allowed.
+    // The size is determined in this function.
+    // The Pod trait ensures the type is valid to cast to bytes.
+    unsafe { slice::from_raw_parts(val.as_ptr().cast(), size) }
+}
+
+/// Cast a slice of a `Pod` type to a mutable byte slice.
+#[inline]
+pub fn bytes_of_slice_mut<T: Pod>(val: &mut [T]) -> &mut [u8] {
+    let size = val.len().wrapping_mul(mem::size_of::<T>());
+    // Safety:
+    // Any alignment is allowed.
+    // The size is determined in this function.
+    // The Pod trait ensures the type is valid to cast to bytes.
+    unsafe { slice::from_raw_parts_mut(val.as_mut_ptr().cast(), size) }
+}
+
+macro_rules! unsafe_impl_pod {
+    ($($struct_name:ident),+ $(,)?) => {
+        $(
+            unsafe impl Pod for $struct_name { }
+        )+
+    }
+}
+
+unsafe_impl_pod!(u8, u16, u32, u64);
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn single() {
+        let x = u32::to_be(0x0123_4567);
+        let mut x_mut = x;
+        let bytes = bytes_of(&x);
+        let bytes_mut = bytes_of_mut(&mut x_mut);
+        assert_eq!(bytes, [0x01, 0x23, 0x45, 0x67]);
+        assert_eq!(bytes, bytes_mut);
+
+        let x16 = [u16::to_be(0x0123), u16::to_be(0x4567)];
+
+        let (y, tail) = from_bytes::<u32>(bytes).unwrap();
+        let (y_mut, tail_mut) = from_bytes_mut::<u32>(bytes_mut).unwrap();
+        assert_eq!(*y, x);
+        assert_eq!(y, y_mut);
+        assert_eq!(tail, &[]);
+        assert_eq!(tail, tail_mut);
+
+        let (y, tail) = from_bytes::<u16>(bytes).unwrap();
+        let (y_mut, tail_mut) = from_bytes_mut::<u16>(bytes_mut).unwrap();
+        assert_eq!(*y, x16[0]);
+        assert_eq!(y, y_mut);
+        assert_eq!(tail, &bytes[2..]);
+        assert_eq!(tail, tail_mut);
+
+        let (y, tail) = from_bytes::<u16>(&bytes[2..]).unwrap();
+        let (y_mut, tail_mut) = from_bytes_mut::<u16>(&mut bytes_mut[2..]).unwrap();
+        assert_eq!(*y, x16[1]);
+        assert_eq!(y, y_mut);
+        assert_eq!(tail, &[]);
+        assert_eq!(tail, tail_mut);
+
+        assert_eq!(from_bytes::<u16>(&bytes[1..]), Err(()));
+        assert_eq!(from_bytes::<u16>(&bytes[3..]), Err(()));
+        assert_eq!(from_bytes::<u16>(&bytes[4..]), Err(()));
+        assert_eq!(from_bytes_mut::<u16>(&mut bytes_mut[1..]), Err(()));
+        assert_eq!(from_bytes_mut::<u16>(&mut bytes_mut[3..]), Err(()));
+        assert_eq!(from_bytes_mut::<u16>(&mut bytes_mut[4..]), Err(()));
+    }
+
+    #[test]
+    fn slice() {
+        let x = [
+            u16::to_be(0x0123),
+            u16::to_be(0x4567),
+            u16::to_be(0x89ab),
+            u16::to_be(0xcdef),
+        ];
+        let mut x_mut = x;
+
+        let bytes = bytes_of_slice(&x);
+        let bytes_mut = bytes_of_slice_mut(&mut x_mut);
+        assert_eq!(bytes, [0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef]);
+        assert_eq!(bytes, bytes_mut);
+
+        let (y, tail) = slice_from_bytes::<u16>(bytes, 4).unwrap();
+        let (y_mut, tail_mut) = slice_from_bytes_mut::<u16>(bytes_mut, 4).unwrap();
+        assert_eq!(y, x);
+        assert_eq!(y, y_mut);
+        assert_eq!(tail, &[]);
+        assert_eq!(tail, tail_mut);
+
+        let (y, tail) = slice_from_bytes::<u16>(&bytes[2..], 2).unwrap();
+        let (y_mut, tail_mut) = slice_from_bytes::<u16>(&mut bytes_mut[2..], 2).unwrap();
+        assert_eq!(y, &x[1..3]);
+        assert_eq!(y, y_mut);
+        assert_eq!(tail, &bytes[6..]);
+        assert_eq!(tail, tail_mut);
+
+        assert_eq!(slice_from_bytes::<u16>(bytes, 5), Err(()));
+        assert_eq!(slice_from_bytes::<u16>(&bytes[2..], 4), Err(()));
+        assert_eq!(slice_from_bytes::<u16>(&bytes[1..], 2), Err(()));
+        assert_eq!(slice_from_bytes_mut::<u16>(bytes_mut, 5), Err(()));
+        assert_eq!(slice_from_bytes_mut::<u16>(&mut bytes_mut[2..], 4), Err(()));
+        assert_eq!(slice_from_bytes_mut::<u16>(&mut bytes_mut[1..], 2), Err(()));
+    }
+}

vendor/object/src/read/archive.rs

@@ -0,0 +1,759 @@
+//! Support for archive files.
+//!
+//! ## Example
+//!  ```no_run
+//! use object::{Object, ObjectSection};
+//! use std::error::Error;
+//! use std::fs;
+//!
+//! /// Reads an archive and displays the name of each member.
+//! fn main() -> Result<(), Box<dyn Error>> {
+//! #   #[cfg(feature = "std")] {
+//!     let data = fs::read("path/to/binary")?;
+//!     let file = object::read::archive::ArchiveFile::parse(&*data)?;
+//!     for member in file.members() {
+//!         let member = member?;
+//!         println!("{}", String::from_utf8_lossy(member.name()));
+//!     }
+//! #   }
+//!     Ok(())
+//! }
+//! ```
+
+use core::convert::TryInto;
+
+use crate::archive;
+use crate::read::{self, Bytes, Error, ReadError, ReadRef};
+
+/// The kind of archive format.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[non_exhaustive]
+pub enum ArchiveKind {
+    /// There are no special files that indicate the archive format.
+    Unknown,
+    /// The GNU (or System V) archive format.
+    Gnu,
+    /// The GNU (or System V) archive format with 64-bit symbol table.
+    Gnu64,
+    /// The BSD archive format.
+    Bsd,
+    /// The BSD archive format with 64-bit symbol table.
+    ///
+    /// This is used for Darwin.
+    Bsd64,
+    /// The Windows COFF archive format.
+    Coff,
+    /// The AIX big archive format.
+    AixBig,
+}
+
+/// The list of members in the archive.
+#[derive(Debug, Clone, Copy)]
+enum Members<'data> {
+    Common {
+        offset: u64,
+        end_offset: u64,
+    },
+    AixBig {
+        index: &'data [archive::AixMemberOffset],
+    },
+}
+
+/// A partially parsed archive file.
+#[derive(Debug, Clone, Copy)]
+pub struct ArchiveFile<'data, R: ReadRef<'data> = &'data [u8]> {
+    data: R,
+    kind: ArchiveKind,
+    members: Members<'data>,
+    symbols: (u64, u64),
+    names: &'data [u8],
+}
+
+impl<'data, R: ReadRef<'data>> ArchiveFile<'data, R> {
+    /// Parse the archive header and special members.
+    pub fn parse(data: R) -> read::Result<Self> {
+        let len = data.len().read_error("Unknown archive length")?;
+        let mut tail = 0;
+        let magic = data
+            .read_bytes(&mut tail, archive::MAGIC.len() as u64)
+            .read_error("Invalid archive size")?;
+
+        if magic == archive::AIX_BIG_MAGIC {
+            return Self::parse_aixbig(data);
+        } else if magic != archive::MAGIC {
+            return Err(Error("Unsupported archive identifier"));
+        }
+
+        let mut members_offset = tail;
+        let members_end_offset = len;
+
+        let mut file = ArchiveFile {
+            data,
+            kind: ArchiveKind::Unknown,
+            members: Members::Common {
+                offset: 0,
+                end_offset: 0,
+            },
+            symbols: (0, 0),
+            names: &[],
+        };
+
+        // The first few members may be special, so parse them.
+        // GNU has:
+        // - "/" or "/SYM64/": symbol table (optional)
+        // - "//": names table (optional)
+        // COFF has:
+        // - "/": first linker member
+        // - "/": second linker member
+        // - "//": names table
+        // BSD has:
+        // - "__.SYMDEF" or "__.SYMDEF SORTED": symbol table (optional)
+        // BSD 64-bit has:
+        // - "__.SYMDEF_64" or "__.SYMDEF_64 SORTED": symbol table (optional)
+        // BSD may use the extended name for the symbol table. This is handled
+        // by `ArchiveMember::parse`.
+        if tail < len {
+            let member = ArchiveMember::parse(data, &mut tail, &[])?;
+            if member.name == b"/" {
+                // GNU symbol table (unless we later determine this is COFF).
+                file.kind = ArchiveKind::Gnu;
+                file.symbols = member.file_range();
+                members_offset = tail;
+
+                if tail < len {
+                    let member = ArchiveMember::parse(data, &mut tail, &[])?;
+                    if member.name == b"/" {
+                        // COFF linker member.
+                        file.kind = ArchiveKind::Coff;
+                        file.symbols = member.file_range();
+                        members_offset = tail;
+
+                        if tail < len {
+                            let member = ArchiveMember::parse(data, &mut tail, &[])?;
+                            if member.name == b"//" {
+                                // COFF names table.
+                                file.names = member.data(data)?;
+                                members_offset = tail;
+                            }
+                        }
+                    } else if member.name == b"//" {
+                        // GNU names table.
+                        file.names = member.data(data)?;
+                        members_offset = tail;
+                    }
+                }
+            } else if member.name == b"/SYM64/" {
+                // GNU 64-bit symbol table.
+                file.kind = ArchiveKind::Gnu64;
+                file.symbols = member.file_range();
+                members_offset = tail;
+
+                if tail < len {
+                    let member = ArchiveMember::parse(data, &mut tail, &[])?;
+                    if member.name == b"//" {
+                        // GNU names table.
+                        file.names = member.data(data)?;
+                        members_offset = tail;
+                    }
+                }
+            } else if member.name == b"//" {
+                // GNU names table.
+                file.kind = ArchiveKind::Gnu;
+                file.names = member.data(data)?;
+                members_offset = tail;
+            } else if member.name == b"__.SYMDEF" || member.name == b"__.SYMDEF SORTED" {
+                // BSD symbol table.
+                file.kind = ArchiveKind::Bsd;
+                file.symbols = member.file_range();
+                members_offset = tail;
+            } else if member.name == b"__.SYMDEF_64" || member.name == b"__.SYMDEF_64 SORTED" {
+                // BSD 64-bit symbol table.
+                file.kind = ArchiveKind::Bsd64;
+                file.symbols = member.file_range();
+                members_offset = tail;
+            } else {
+                // TODO: This could still be a BSD file. We leave this as unknown for now.
+            }
+        }
+        file.members = Members::Common {
+            offset: members_offset,
+            end_offset: members_end_offset,
+        };
+        Ok(file)
+    }
+
+    fn parse_aixbig(data: R) -> read::Result<Self> {
+        let mut tail = 0;
+
+        let file_header = data
+            .read::<archive::AixFileHeader>(&mut tail)
+            .read_error("Invalid AIX big archive file header")?;
+        // Caller already validated this.
+        debug_assert_eq!(file_header.magic, archive::AIX_BIG_MAGIC);
+
+        let mut file = ArchiveFile {
+            data,
+            kind: ArchiveKind::AixBig,
+            members: Members::AixBig { index: &[] },
+            symbols: (0, 0),
+            names: &[],
+        };
+
+        // Read the span of symbol table.
+        let symtbl64 = parse_u64_digits(&file_header.gst64off, 10)
+            .read_error("Invalid offset to 64-bit symbol table in AIX big archive")?;
+        if symtbl64 > 0 {
+            // The symbol table is also a file with header.
+            let member = ArchiveMember::parse_aixbig(data, symtbl64)?;
+            file.symbols = member.file_range();
+        } else {
+            let symtbl = parse_u64_digits(&file_header.gstoff, 10)
+                .read_error("Invalid offset to symbol table in AIX big archive")?;
+            if symtbl > 0 {
+                // The symbol table is also a file with header.
+                let member = ArchiveMember::parse_aixbig(data, symtbl)?;
+                file.symbols = member.file_range();
+            }
+        }
+
+        // Big archive member index table lists file entries with offsets and names.
+        // To avoid potential infinite loop (members are double-linked list), the
+        // iterator goes through the index instead of real members.
+        let member_table_offset = parse_u64_digits(&file_header.memoff, 10)
+            .read_error("Invalid offset for member table of AIX big archive")?;
+        if member_table_offset == 0 {
+            // The offset would be zero if archive contains no file.
+            return Ok(file);
+        }
+
+        // The member index table is also a file with header.
+        let member = ArchiveMember::parse_aixbig(data, member_table_offset)?;
+        let mut member_data = Bytes(member.data(data)?);
+
+        // Structure of member index table:
+        // Number of entries (20 bytes)
+        // Offsets of each entry (20*N bytes)
+        // Names string table (the rest of bytes to fill size defined in header)
+        let members_count_bytes = member_data
+            .read_slice::<u8>(20)
+            .read_error("Missing member count in AIX big archive")?;
+        let members_count = parse_u64_digits(members_count_bytes, 10)
+            .and_then(|size| size.try_into().ok())
+            .read_error("Invalid member count in AIX big archive")?;
+        let index = member_data
+            .read_slice::<archive::AixMemberOffset>(members_count)
+            .read_error("Member count overflow in AIX big archive")?;
+        file.members = Members::AixBig { index };
+
+        Ok(file)
+    }
+
+    /// Return the archive format.
+    #[inline]
+    pub fn kind(&self) -> ArchiveKind {
+        self.kind
+    }
+
+    /// Iterate over the members of the archive.
+    ///
+    /// This does not return special members.
+    #[inline]
+    pub fn members(&self) -> ArchiveMemberIterator<'data, R> {
+        ArchiveMemberIterator {
+            data: self.data,
+            members: self.members,
+            names: self.names,
+        }
+    }
+}
+
+/// An iterator over the members of an archive.
+#[derive(Debug)]
+pub struct ArchiveMemberIterator<'data, R: ReadRef<'data> = &'data [u8]> {
+    data: R,
+    members: Members<'data>,
+    names: &'data [u8],
+}
+
+impl<'data, R: ReadRef<'data>> Iterator for ArchiveMemberIterator<'data, R> {
+    type Item = read::Result<ArchiveMember<'data>>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        match &mut self.members {
+            Members::Common {
+                ref mut offset,
+                ref mut end_offset,
+            } => {
+                if *offset >= *end_offset {
+                    return None;
+                }
+                let member = ArchiveMember::parse(self.data, offset, self.names);
+                if member.is_err() {
+                    *offset = *end_offset;
+                }
+                Some(member)
+            }
+            Members::AixBig { ref mut index } => match **index {
+                [] => None,
+                [ref first, ref rest @ ..] => {
+                    *index = rest;
+                    let member = ArchiveMember::parse_aixbig_index(self.data, first);
+                    if member.is_err() {
+                        *index = &[];
+                    }
+                    Some(member)
+                }
+            },
+        }
+    }
+}
+
+/// An archive member header.
+#[derive(Debug, Clone, Copy)]
+enum MemberHeader<'data> {
+    /// Common header used by many formats.
+    Common(&'data archive::Header),
+    /// AIX big archive header
+    AixBig(&'data archive::AixHeader),
+}
+
+/// A partially parsed archive member.
+#[derive(Debug)]
+pub struct ArchiveMember<'data> {
+    header: MemberHeader<'data>,
+    name: &'data [u8],
+    offset: u64,
+    size: u64,
+}
+
+impl<'data> ArchiveMember<'data> {
+    /// Parse the member header, name, and file data in an archive with the common format.
+    ///
+    /// This reads the extended name (if any) and adjusts the file size.
+    fn parse<R: ReadRef<'data>>(
+        data: R,
+        offset: &mut u64,
+        names: &'data [u8],
+    ) -> read::Result<Self> {
+        let header = data
+            .read::<archive::Header>(offset)
+            .read_error("Invalid archive member header")?;
+        if header.terminator != archive::TERMINATOR {
+            return Err(Error("Invalid archive terminator"));
+        }
+
+        let mut file_offset = *offset;
+        let mut file_size =
+            parse_u64_digits(&header.size, 10).read_error("Invalid archive member size")?;
+        *offset = offset
+            .checked_add(file_size)
+            .read_error("Archive member size is too large")?;
+        // Entries are padded to an even number of bytes.
+        if (file_size & 1) != 0 {
+            *offset = offset.saturating_add(1);
+        }
+
+        let name = if header.name[0] == b'/' && (header.name[1] as char).is_ascii_digit() {
+            // Read file name from the names table.
+            parse_sysv_extended_name(&header.name[1..], names)
+                .read_error("Invalid archive extended name offset")?
+        } else if &header.name[..3] == b"#1/" && (header.name[3] as char).is_ascii_digit() {
+            // Read file name from the start of the file data.
+            parse_bsd_extended_name(&header.name[3..], data, &mut file_offset, &mut file_size)
+                .read_error("Invalid archive extended name length")?
+        } else if header.name[0] == b'/' {
+            let name_len = memchr::memchr(b' ', &header.name).unwrap_or(header.name.len());
+            &header.name[..name_len]
+        } else {
+            let name_len = memchr::memchr(b'/', &header.name)
+                .or_else(|| memchr::memchr(b' ', &header.name))
+                .unwrap_or(header.name.len());
+            &header.name[..name_len]
+        };
+
+        Ok(ArchiveMember {
+            header: MemberHeader::Common(header),
+            name,
+            offset: file_offset,
+            size: file_size,
+        })
+    }
+
+    /// Parse a member index entry in an AIX big archive,
+    /// and then parse the member header, name, and file data.
+    fn parse_aixbig_index<R: ReadRef<'data>>(
+        data: R,
+        index: &archive::AixMemberOffset,
+    ) -> read::Result<Self> {
+        let offset = parse_u64_digits(&index.0, 10)
+            .read_error("Invalid AIX big archive file member offset")?;
+        Self::parse_aixbig(data, offset)
+    }
+
+    /// Parse the member header, name, and file data in an AIX big archive.
+    fn parse_aixbig<R: ReadRef<'data>>(data: R, mut offset: u64) -> read::Result<Self> {
+        // The format was described at
+        // https://www.ibm.com/docs/en/aix/7.3?topic=formats-ar-file-format-big
+        let header = data
+            .read::<archive::AixHeader>(&mut offset)
+            .read_error("Invalid AIX big archive member header")?;
+        let name_length = parse_u64_digits(&header.namlen, 10)
+            .read_error("Invalid AIX big archive member name length")?;
+        let name = data
+            .read_bytes(&mut offset, name_length)
+            .read_error("Invalid AIX big archive member name")?;
+
+        // The actual data for a file member begins at the first even-byte boundary beyond the
+        // member header and continues for the number of bytes specified by the ar_size field. The
+        // ar command inserts null bytes for padding where necessary.
+        if offset & 1 != 0 {
+            offset = offset.saturating_add(1);
+        }
+        // Because of the even-byte boundary, we have to read and check terminator after header.
+        let terminator = data
+            .read_bytes(&mut offset, 2)
+            .read_error("Invalid AIX big archive terminator")?;
+        if terminator != archive::TERMINATOR {
+            return Err(Error("Invalid AIX big archive terminator"));
+        }
+
+        let size = parse_u64_digits(&header.size, 10)
+            .read_error("Invalid archive member size in AIX big archive")?;
+        Ok(ArchiveMember {
+            header: MemberHeader::AixBig(header),
+            name,
+            offset,
+            size,
+        })
+    }
+
+    /// Return the raw header that is common to many archive formats.
+    ///
+    /// Returns `None` if this archive does not use the common header format.
+    #[inline]
+    pub fn header(&self) -> Option<&'data archive::Header> {
+        match self.header {
+            MemberHeader::Common(header) => Some(header),
+            _ => None,
+        }
+    }
+
+    /// Return the raw header for AIX big archives.
+    ///
+    /// Returns `None` if this is not an AIX big archive.
+    #[inline]
+    pub fn aix_header(&self) -> Option<&'data archive::AixHeader> {
+        match self.header {
+            MemberHeader::AixBig(header) => Some(header),
+            _ => None,
+        }
+    }
+
+    /// Return the parsed file name.
+    ///
+    /// This may be an extended file name.
+    #[inline]
+    pub fn name(&self) -> &'data [u8] {
+        self.name
+    }
+
+    /// Parse the file modification timestamp from the header.
+    #[inline]
+    pub fn date(&self) -> Option<u64> {
+        match &self.header {
+            MemberHeader::Common(header) => parse_u64_digits(&header.date, 10),
+            MemberHeader::AixBig(header) => parse_u64_digits(&header.date, 10),
+        }
+    }
+
+    /// Parse the user ID from the header.
+    #[inline]
+    pub fn uid(&self) -> Option<u64> {
+        match &self.header {
+            MemberHeader::Common(header) => parse_u64_digits(&header.uid, 10),
+            MemberHeader::AixBig(header) => parse_u64_digits(&header.uid, 10),
+        }
+    }
+
+    /// Parse the group ID from the header.
+    #[inline]
+    pub fn gid(&self) -> Option<u64> {
+        match &self.header {
+            MemberHeader::Common(header) => parse_u64_digits(&header.gid, 10),
+            MemberHeader::AixBig(header) => parse_u64_digits(&header.gid, 10),
+        }
+    }
+
+    /// Parse the file mode from the header.
+    #[inline]
+    pub fn mode(&self) -> Option<u64> {
+        match &self.header {
+            MemberHeader::Common(header) => parse_u64_digits(&header.mode, 8),
+            MemberHeader::AixBig(header) => parse_u64_digits(&header.mode, 8),
+        }
+    }
+
+    /// Return the offset and size of the file data.
+    pub fn file_range(&self) -> (u64, u64) {
+        (self.offset, self.size)
+    }
+
+    /// Return the file data.
+    #[inline]
+    pub fn data<R: ReadRef<'data>>(&self, data: R) -> read::Result<&'data [u8]> {
+        data.read_bytes_at(self.offset, self.size)
+            .read_error("Archive member size is too large")
+    }
+}
+
+// Ignores bytes starting from the first space.
+fn parse_u64_digits(digits: &[u8], radix: u32) -> Option<u64> {
+    if let [b' ', ..] = digits {
+        return None;
+    }
+    let mut result: u64 = 0;
+    for &c in digits {
+        if c == b' ' {
+            return Some(result);
+        } else {
+            let x = (c as char).to_digit(radix)?;
+            result = result
+                .checked_mul(u64::from(radix))?
+                .checked_add(u64::from(x))?;
+        }
+    }
+    Some(result)
+}
+
+fn parse_sysv_extended_name<'data>(digits: &[u8], names: &'data [u8]) -> Result<&'data [u8], ()> {
+    let offset = parse_u64_digits(digits, 10).ok_or(())?;
+    let offset = offset.try_into().map_err(|_| ())?;
+    let name_data = names.get(offset..).ok_or(())?;
+    let name = match memchr::memchr2(b'/', b'\0', name_data) {
+        Some(len) => &name_data[..len],
+        None => name_data,
+    };
+    Ok(name)
+}
+
+/// Modifies `data` to start after the extended name.
+fn parse_bsd_extended_name<'data, R: ReadRef<'data>>(
+    digits: &[u8],
+    data: R,
+    offset: &mut u64,
+    size: &mut u64,
+) -> Result<&'data [u8], ()> {
+    let len = parse_u64_digits(digits, 10).ok_or(())?;
+    *size = size.checked_sub(len).ok_or(())?;
+    let name_data = data.read_bytes(offset, len)?;
+    let name = match memchr::memchr(b'\0', name_data) {
+        Some(len) => &name_data[..len],
+        None => name_data,
+    };
+    Ok(name)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn kind() {
+        let data = b"!<arch>\n";
+        let archive = ArchiveFile::parse(&data[..]).unwrap();
+        assert_eq!(archive.kind(), ArchiveKind::Unknown);
+
+        let data = b"\
+            !<arch>\n\
+            /                                               4         `\n\
+            0000";
+        let archive = ArchiveFile::parse(&data[..]).unwrap();
+        assert_eq!(archive.kind(), ArchiveKind::Gnu);
+
+        let data = b"\
+            !<arch>\n\
+            //                                              4         `\n\
+            0000";
+        let archive = ArchiveFile::parse(&data[..]).unwrap();
+        assert_eq!(archive.kind(), ArchiveKind::Gnu);
+
+        let data = b"\
+            !<arch>\n\
+            /                                               4         `\n\
+            0000\
+            //                                              4         `\n\
+            0000";
+        let archive = ArchiveFile::parse(&data[..]).unwrap();
+        assert_eq!(archive.kind(), ArchiveKind::Gnu);
+
+        let data = b"\
+            !<arch>\n\
+            /SYM64/                                         4         `\n\
+            0000";
+        let archive = ArchiveFile::parse(&data[..]).unwrap();
+        assert_eq!(archive.kind(), ArchiveKind::Gnu64);
+
+        let data = b"\
+            !<arch>\n\
+            /SYM64/                                         4         `\n\
+            0000\
+            //                                              4         `\n\
+            0000";
+        let archive = ArchiveFile::parse(&data[..]).unwrap();
+        assert_eq!(archive.kind(), ArchiveKind::Gnu64);
+
+        let data = b"\
+            !<arch>\n\
+            __.SYMDEF                                       4         `\n\
+            0000";
+        let archive = ArchiveFile::parse(&data[..]).unwrap();
+        assert_eq!(archive.kind(), ArchiveKind::Bsd);
+
+        let data = b"\
+            !<arch>\n\
+            #1/9                                            13        `\n\
+            __.SYMDEF0000";
+        let archive = ArchiveFile::parse(&data[..]).unwrap();
+        assert_eq!(archive.kind(), ArchiveKind::Bsd);
+
+        let data = b"\
+            !<arch>\n\
+            #1/16                                           20        `\n\
+            __.SYMDEF SORTED0000";
+        let archive = ArchiveFile::parse(&data[..]).unwrap();
+        assert_eq!(archive.kind(), ArchiveKind::Bsd);
+
+        let data = b"\
+            !<arch>\n\
+            __.SYMDEF_64                                    4         `\n\
+            0000";
+        let archive = ArchiveFile::parse(&data[..]).unwrap();
+        assert_eq!(archive.kind(), ArchiveKind::Bsd64);
+
+        let data = b"\
+            !<arch>\n\
+            #1/12                                           16        `\n\
+            __.SYMDEF_640000";
+        let archive = ArchiveFile::parse(&data[..]).unwrap();
+        assert_eq!(archive.kind(), ArchiveKind::Bsd64);
+
+        let data = b"\
+            !<arch>\n\
+            #1/19                                           23        `\n\
+            __.SYMDEF_64 SORTED0000";
+        let archive = ArchiveFile::parse(&data[..]).unwrap();
+        assert_eq!(archive.kind(), ArchiveKind::Bsd64);
+
+        let data = b"\
+            !<arch>\n\
+            /                                               4         `\n\
+            0000\
+            /                                               4         `\n\
+            0000\
+            //                                              4         `\n\
+            0000";
+        let archive = ArchiveFile::parse(&data[..]).unwrap();
+        assert_eq!(archive.kind(), ArchiveKind::Coff);
+
+        let data = b"\
+            <bigaf>\n\
+            0                   0                   \
+            0                   0                   \
+            0                   128                 \
+            6                   0                   \
+            0                   \0\0\0\0\0\0\0\0\0\0\0\0\
+            \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+            \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+            \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
+        let archive = ArchiveFile::parse(&data[..]).unwrap();
+        assert_eq!(archive.kind(), ArchiveKind::AixBig);
+    }
+
+    #[test]
+    fn gnu_names() {
+        let data = b"\
+            !<arch>\n\
+            //                                              18        `\n\
+            0123456789abcdef/\n\
+            s p a c e/      0           0     0     644     4         `\n\
+            0000\
+            0123456789abcde/0           0     0     644     3         `\n\
+            odd\n\
+            /0              0           0     0     644     4         `\n\
+            even";
+        let data = &data[..];
+        let archive = ArchiveFile::parse(data).unwrap();
+        assert_eq!(archive.kind(), ArchiveKind::Gnu);
+        let mut members = archive.members();
+
+        let member = members.next().unwrap().unwrap();
+        assert_eq!(member.name(), b"s p a c e");
+        assert_eq!(member.data(data).unwrap(), &b"0000"[..]);
+
+        let member = members.next().unwrap().unwrap();
+        assert_eq!(member.name(), b"0123456789abcde");
+        assert_eq!(member.data(data).unwrap(), &b"odd"[..]);
+
+        let member = members.next().unwrap().unwrap();
+        assert_eq!(member.name(), b"0123456789abcdef");
+        assert_eq!(member.data(data).unwrap(), &b"even"[..]);
+
+        assert!(members.next().is_none());
+    }
+
+    #[test]
+    fn bsd_names() {
+        let data = b"\
+            !<arch>\n\
+            0123456789abcde 0           0     0     644     3         `\n\
+            odd\n\
+            #1/16           0           0     0     644     20        `\n\
+            0123456789abcdefeven";
+        let data = &data[..];
+        let archive = ArchiveFile::parse(data).unwrap();
+        assert_eq!(archive.kind(), ArchiveKind::Unknown);
+        let mut members = archive.members();
+
+        let member = members.next().unwrap().unwrap();
+        assert_eq!(member.name(), b"0123456789abcde");
+        assert_eq!(member.data(data).unwrap(), &b"odd"[..]);
+
+        let member = members.next().unwrap().unwrap();
+        assert_eq!(member.name(), b"0123456789abcdef");
+        assert_eq!(member.data(data).unwrap(), &b"even"[..]);
+
+        assert!(members.next().is_none());
+    }
+
+    #[test]
+    fn aix_names() {
+        let data = b"\
+            <bigaf>\n\
+            396                 0                   0                   \
+            128                 262                 0                   \
+            4                   262                 0                   \
+            1662610370  223         1           644         16  \
+            0123456789abcdef`\nord\n\
+            4                   396                 128                 \
+            1662610374  223         1           644         16  \
+            fedcba9876543210`\nrev\n\
+            94                  0                   262                 \
+            0           0           0           0           0   \
+            `\n2                   128                 \
+            262                 0123456789abcdef\0fedcba9876543210\0";
+        let data = &data[..];
+        let archive = ArchiveFile::parse(data).unwrap();
+        assert_eq!(archive.kind(), ArchiveKind::AixBig);
+        let mut members = archive.members();
+
+        let member = members.next().unwrap().unwrap();
+        assert_eq!(member.name(), b"0123456789abcdef");
+        assert_eq!(member.data(data).unwrap(), &b"ord\n"[..]);
+
+        let member = members.next().unwrap().unwrap();
+        assert_eq!(member.name(), b"fedcba9876543210");
+        assert_eq!(member.data(data).unwrap(), &b"rev\n"[..]);
+
+        assert!(members.next().is_none());
+    }
+}

vendor/object/src/read/coff/comdat.rs

@@ -0,0 +1,211 @@
+use core::str;
+
+use crate::endian::LittleEndian as LE;
+use crate::pe;
+use crate::read::{
+    self, ComdatKind, ObjectComdat, ReadError, ReadRef, Result, SectionIndex, SymbolIndex,
+};
+
+use super::{CoffFile, CoffHeader, ImageSymbol};
+
+/// An iterator for the COMDAT section groups in a [`CoffBigFile`](super::CoffBigFile).
+pub type CoffBigComdatIterator<'data, 'file, R = &'data [u8]> =
+    CoffComdatIterator<'data, 'file, R, pe::AnonObjectHeaderBigobj>;
+
+/// An iterator for the COMDAT section groups in a [`CoffFile`].
+#[derive(Debug)]
+pub struct CoffComdatIterator<
+    'data,
+    'file,
+    R: ReadRef<'data> = &'data [u8],
+    Coff: CoffHeader = pe::ImageFileHeader,
+> {
+    pub(super) file: &'file CoffFile<'data, R, Coff>,
+    pub(super) index: usize,
+}
+
+impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> Iterator
+    for CoffComdatIterator<'data, 'file, R, Coff>
+{
+    type Item = CoffComdat<'data, 'file, R, Coff>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        loop {
+            let index = self.index;
+            let symbol = self.file.common.symbols.symbol(index).ok()?;
+            self.index += 1 + symbol.number_of_aux_symbols() as usize;
+            if let Some(comdat) = CoffComdat::parse(self.file, symbol, index) {
+                return Some(comdat);
+            }
+        }
+    }
+}
+
+/// A COMDAT section group in a [`CoffBigFile`](super::CoffBigFile).
+///
+/// Most functionality is provided by the [`ObjectComdat`] trait implementation.
+pub type CoffBigComdat<'data, 'file, R = &'data [u8]> =
+    CoffComdat<'data, 'file, R, pe::AnonObjectHeaderBigobj>;
+
+/// A COMDAT section group in a [`CoffFile`].
+///
+/// Most functionality is provided by the [`ObjectComdat`] trait implementation.
+#[derive(Debug)]
+pub struct CoffComdat<
+    'data,
+    'file,
+    R: ReadRef<'data> = &'data [u8],
+    Coff: CoffHeader = pe::ImageFileHeader,
+> {
+    file: &'file CoffFile<'data, R, Coff>,
+    symbol_index: SymbolIndex,
+    symbol: &'data Coff::ImageSymbol,
+    selection: u8,
+}
+
+impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> CoffComdat<'data, 'file, R, Coff> {
+    fn parse(
+        file: &'file CoffFile<'data, R, Coff>,
+        section_symbol: &'data Coff::ImageSymbol,
+        index: usize,
+    ) -> Option<CoffComdat<'data, 'file, R, Coff>> {
+        // Must be a section symbol.
+        if !section_symbol.has_aux_section() {
+            return None;
+        }
+
+        // Auxiliary record must have a non-associative selection.
+        let aux = file.common.symbols.aux_section(index).ok()?;
+        let selection = aux.selection;
+        if selection == 0 || selection == pe::IMAGE_COMDAT_SELECT_ASSOCIATIVE {
+            return None;
+        }
+
+        // Find the COMDAT symbol.
+        let mut symbol_index = index;
+        let mut symbol = section_symbol;
+        let section_number = section_symbol.section_number();
+        loop {
+            symbol_index += 1 + symbol.number_of_aux_symbols() as usize;
+            symbol = file.common.symbols.symbol(symbol_index).ok()?;
+            if section_number == symbol.section_number() {
+                break;
+            }
+        }
+
+        Some(CoffComdat {
+            file,
+            symbol_index: SymbolIndex(symbol_index),
+            symbol,
+            selection,
+        })
+    }
+}
+
+impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> read::private::Sealed
+    for CoffComdat<'data, 'file, R, Coff>
+{
+}
+
+impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> ObjectComdat<'data>
+    for CoffComdat<'data, 'file, R, Coff>
+{
+    type SectionIterator = CoffComdatSectionIterator<'data, 'file, R, Coff>;
+
+    #[inline]
+    fn kind(&self) -> ComdatKind {
+        match self.selection {
+            pe::IMAGE_COMDAT_SELECT_NODUPLICATES => ComdatKind::NoDuplicates,
+            pe::IMAGE_COMDAT_SELECT_ANY => ComdatKind::Any,
+            pe::IMAGE_COMDAT_SELECT_SAME_SIZE => ComdatKind::SameSize,
+            pe::IMAGE_COMDAT_SELECT_EXACT_MATCH => ComdatKind::ExactMatch,
+            pe::IMAGE_COMDAT_SELECT_LARGEST => ComdatKind::Largest,
+            pe::IMAGE_COMDAT_SELECT_NEWEST => ComdatKind::Newest,
+            _ => ComdatKind::Unknown,
+        }
+    }
+
+    #[inline]
+    fn symbol(&self) -> SymbolIndex {
+        self.symbol_index
+    }
+
+    #[inline]
+    fn name_bytes(&self) -> Result<&[u8]> {
+        // Find the name of first symbol referring to the section.
+        self.symbol.name(self.file.common.symbols.strings())
+    }
+
+    #[inline]
+    fn name(&self) -> Result<&str> {
+        let bytes = self.name_bytes()?;
+        str::from_utf8(bytes)
+            .ok()
+            .read_error("Non UTF-8 COFF COMDAT name")
+    }
+
+    #[inline]
+    fn sections(&self) -> Self::SectionIterator {
+        CoffComdatSectionIterator {
+            file: self.file,
+            section_number: self.symbol.section_number(),
+            index: 0,
+        }
+    }
+}
+
+/// An iterator for the sections in a COMDAT section group in a [`CoffBigFile`](super::CoffBigFile).
+pub type CoffBigComdatSectionIterator<'data, 'file, R = &'data [u8]> =
+    CoffComdatSectionIterator<'data, 'file, R, pe::AnonObjectHeaderBigobj>;
+
+/// An iterator for the sections in a COMDAT section group in a [`CoffFile`].
+#[derive(Debug)]
+pub struct CoffComdatSectionIterator<
+    'data,
+    'file,
+    R: ReadRef<'data> = &'data [u8],
+    Coff: CoffHeader = pe::ImageFileHeader,
+> {
+    file: &'file CoffFile<'data, R, Coff>,
+    section_number: i32,
+    index: usize,
+}
+
+impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> Iterator
+    for CoffComdatSectionIterator<'data, 'file, R, Coff>
+{
+    type Item = SectionIndex;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        // Find associated COMDAT symbols.
+        // TODO: it seems gcc doesn't use associated symbols for this
+        loop {
+            let index = self.index;
+            let symbol = self.file.common.symbols.symbol(index).ok()?;
+            self.index += 1 + symbol.number_of_aux_symbols() as usize;
+
+            // Must be a section symbol.
+            if !symbol.has_aux_section() {
+                continue;
+            }
+
+            let section_number = symbol.section_number();
+
+            let aux = self.file.common.symbols.aux_section(index).ok()?;
+            if aux.selection == pe::IMAGE_COMDAT_SELECT_ASSOCIATIVE {
+                let number = if Coff::is_type_bigobj() {
+                    u32::from(aux.number.get(LE)) | (u32::from(aux.high_number.get(LE)) << 16)
+                } else {
+                    u32::from(aux.number.get(LE))
+                };
+                if number as i32 == self.section_number {
+                    return Some(SectionIndex(section_number as usize));
+                }
+            } else if aux.selection != 0 {
+                if section_number == self.section_number {
+                    return Some(SectionIndex(section_number as usize));
+                }
+            }
+        }
+    }
+}

vendor/object/src/read/coff/file.rs

@@ -0,0 +1,381 @@
+use alloc::vec::Vec;
+use core::fmt::Debug;
+
+use crate::read::{
+    self, Architecture, Export, FileFlags, Import, NoDynamicRelocationIterator, Object, ObjectKind,
+    ObjectSection, ReadError, ReadRef, Result, SectionIndex, SubArchitecture, SymbolIndex,
+};
+use crate::{pe, LittleEndian as LE, Pod};
+
+use super::{
+    CoffComdat, CoffComdatIterator, CoffSection, CoffSectionIterator, CoffSegment,
+    CoffSegmentIterator, CoffSymbol, CoffSymbolIterator, CoffSymbolTable, ImageSymbol,
+    SectionTable, SymbolTable,
+};
+
+/// The common parts of `PeFile` and `CoffFile`.
+#[derive(Debug)]
+pub(crate) struct CoffCommon<'data, R: ReadRef<'data>, Coff: CoffHeader = pe::ImageFileHeader> {
+    pub(crate) sections: SectionTable<'data>,
+    pub(crate) symbols: SymbolTable<'data, R, Coff>,
+    pub(crate) image_base: u64,
+}
+
+/// A COFF bigobj object file with 32-bit section numbers.
+///
+/// This is a file that starts with [`pe::AnonObjectHeaderBigobj`], and corresponds
+/// to [`crate::FileKind::CoffBig`].
+///
+/// Most functionality is provided by the [`Object`] trait implementation.
+pub type CoffBigFile<'data, R = &'data [u8]> = CoffFile<'data, R, pe::AnonObjectHeaderBigobj>;
+
+/// A COFF object file.
+///
+/// This is a file that starts with [`pe::ImageFileHeader`], and corresponds
+/// to [`crate::FileKind::Coff`].
+///
+/// Most functionality is provided by the [`Object`] trait implementation.
+#[derive(Debug)]
+pub struct CoffFile<'data, R: ReadRef<'data> = &'data [u8], Coff: CoffHeader = pe::ImageFileHeader>
+{
+    pub(super) header: &'data Coff,
+    pub(super) common: CoffCommon<'data, R, Coff>,
+    pub(super) data: R,
+}
+
+impl<'data, R: ReadRef<'data>, Coff: CoffHeader> CoffFile<'data, R, Coff> {
+    /// Parse the raw COFF file data.
+    pub fn parse(data: R) -> Result<Self> {
+        let mut offset = 0;
+        let header = Coff::parse(data, &mut offset)?;
+        let sections = header.sections(data, offset)?;
+        let symbols = header.symbols(data)?;
+
+        Ok(CoffFile {
+            header,
+            common: CoffCommon {
+                sections,
+                symbols,
+                image_base: 0,
+            },
+            data,
+        })
+    }
+}
+
+impl<'data, R: ReadRef<'data>, Coff: CoffHeader> read::private::Sealed
+    for CoffFile<'data, R, Coff>
+{
+}
+
+impl<'data, 'file, R, Coff> Object<'data, 'file> for CoffFile<'data, R, Coff>
+where
+    'data: 'file,
+    R: 'file + ReadRef<'data>,
+    Coff: CoffHeader,
+{
+    type Segment = CoffSegment<'data, 'file, R, Coff>;
+    type SegmentIterator = CoffSegmentIterator<'data, 'file, R, Coff>;
+    type Section = CoffSection<'data, 'file, R, Coff>;
+    type SectionIterator = CoffSectionIterator<'data, 'file, R, Coff>;
+    type Comdat = CoffComdat<'data, 'file, R, Coff>;
+    type ComdatIterator = CoffComdatIterator<'data, 'file, R, Coff>;
+    type Symbol = CoffSymbol<'data, 'file, R, Coff>;
+    type SymbolIterator = CoffSymbolIterator<'data, 'file, R, Coff>;
+    type SymbolTable = CoffSymbolTable<'data, 'file, R, Coff>;
+    type DynamicRelocationIterator = NoDynamicRelocationIterator;
+
+    fn architecture(&self) -> Architecture {
+        match self.header.machine() {
+            pe::IMAGE_FILE_MACHINE_ARMNT => Architecture::Arm,
+            pe::IMAGE_FILE_MACHINE_ARM64 | pe::IMAGE_FILE_MACHINE_ARM64EC => Architecture::Aarch64,
+            pe::IMAGE_FILE_MACHINE_I386 => Architecture::I386,
+            pe::IMAGE_FILE_MACHINE_AMD64 => Architecture::X86_64,
+            _ => Architecture::Unknown,
+        }
+    }
+
+    fn sub_architecture(&self) -> Option<SubArchitecture> {
+        match self.header.machine() {
+            pe::IMAGE_FILE_MACHINE_ARM64EC => Some(SubArchitecture::Arm64EC),
+            _ => None,
+        }
+    }
+
+    #[inline]
+    fn is_little_endian(&self) -> bool {
+        true
+    }
+
+    #[inline]
+    fn is_64(&self) -> bool {
+        // Windows COFF is always 32-bit, even for 64-bit architectures. This could be confusing.
+        false
+    }
+
+    fn kind(&self) -> ObjectKind {
+        ObjectKind::Relocatable
+    }
+
+    fn segments(&'file self) -> CoffSegmentIterator<'data, 'file, R, Coff> {
+        CoffSegmentIterator {
+            file: self,
+            iter: self.common.sections.iter(),
+        }
+    }
+
+    fn section_by_name_bytes(
+        &'file self,
+        section_name: &[u8],
+    ) -> Option<CoffSection<'data, 'file, R, Coff>> {
+        self.sections()
+            .find(|section| section.name_bytes() == Ok(section_name))
+    }
+
+    fn section_by_index(
+        &'file self,
+        index: SectionIndex,
+    ) -> Result<CoffSection<'data, 'file, R, Coff>> {
+        let section = self.common.sections.section(index.0)?;
+        Ok(CoffSection {
+            file: self,
+            index,
+            section,
+        })
+    }
+
+    fn sections(&'file self) -> CoffSectionIterator<'data, 'file, R, Coff> {
+        CoffSectionIterator {
+            file: self,
+            iter: self.common.sections.iter().enumerate(),
+        }
+    }
+
+    fn comdats(&'file self) -> CoffComdatIterator<'data, 'file, R, Coff> {
+        CoffComdatIterator {
+            file: self,
+            index: 0,
+        }
+    }
+
+    fn symbol_by_index(
+        &'file self,
+        index: SymbolIndex,
+    ) -> Result<CoffSymbol<'data, 'file, R, Coff>> {
+        let symbol = self.common.symbols.symbol(index.0)?;
+        Ok(CoffSymbol {
+            file: &self.common,
+            index,
+            symbol,
+        })
+    }
+
+    fn symbols(&'file self) -> CoffSymbolIterator<'data, 'file, R, Coff> {
+        CoffSymbolIterator {
+            file: &self.common,
+            index: 0,
+        }
+    }
+
+    #[inline]
+    fn symbol_table(&'file self) -> Option<CoffSymbolTable<'data, 'file, R, Coff>> {
+        Some(CoffSymbolTable { file: &self.common })
+    }
+
+    fn dynamic_symbols(&'file self) -> CoffSymbolIterator<'data, 'file, R, Coff> {
+        CoffSymbolIterator {
+            file: &self.common,
+            // Hack: don't return any.
+            index: self.common.symbols.len(),
+        }
+    }
+
+    #[inline]
+    fn dynamic_symbol_table(&'file self) -> Option<CoffSymbolTable<'data, 'file, R, Coff>> {
+        None
+    }
+
+    #[inline]
+    fn dynamic_relocations(&'file self) -> Option<NoDynamicRelocationIterator> {
+        None
+    }
+
+    #[inline]
+    fn imports(&self) -> Result<Vec<Import<'data>>> {
+        // TODO: this could return undefined symbols, but not needed yet.
+        Ok(Vec::new())
+    }
+
+    #[inline]
+    fn exports(&self) -> Result<Vec<Export<'data>>> {
+        // TODO: this could return global symbols, but not needed yet.
+        Ok(Vec::new())
+    }
+
+    fn has_debug_symbols(&self) -> bool {
+        self.section_by_name(".debug_info").is_some()
+    }
+
+    fn relative_address_base(&self) -> u64 {
+        0
+    }
+
+    #[inline]
+    fn entry(&self) -> u64 {
+        0
+    }
+
+    fn flags(&self) -> FileFlags {
+        FileFlags::Coff {
+            characteristics: self.header.characteristics(),
+        }
+    }
+}
+
+/// Read the `class_id` field from a [`pe::AnonObjectHeader`].
+///
+/// This can be used to determine the format of the header.
+pub fn anon_object_class_id<'data, R: ReadRef<'data>>(data: R) -> Result<pe::ClsId> {
+    let header = data
+        .read_at::<pe::AnonObjectHeader>(0)
+        .read_error("Invalid anon object header size or alignment")?;
+    Ok(header.class_id)
+}
+
+/// A trait for generic access to [`pe::ImageFileHeader`] and [`pe::AnonObjectHeaderBigobj`].
+#[allow(missing_docs)]
+pub trait CoffHeader: Debug + Pod {
+    type ImageSymbol: ImageSymbol;
+    type ImageSymbolBytes: Debug + Pod;
+
+    /// Return true if this type is [`pe::AnonObjectHeaderBigobj`].
+    ///
+    /// This is a property of the type, not a value in the header data.
+    fn is_type_bigobj() -> bool;
+
+    fn machine(&self) -> u16;
+    fn number_of_sections(&self) -> u32;
+    fn pointer_to_symbol_table(&self) -> u32;
+    fn number_of_symbols(&self) -> u32;
+    fn characteristics(&self) -> u16;
+
+    /// Read the file header.
+    ///
+    /// `data` must be the entire file data.
+    /// `offset` must be the file header offset. It is updated to point after the optional header,
+    /// which is where the section headers are located.
+    fn parse<'data, R: ReadRef<'data>>(data: R, offset: &mut u64) -> read::Result<&'data Self>;
+
+    /// Read the section table.
+    ///
+    /// `data` must be the entire file data.
+    /// `offset` must be after the optional file header.
+    #[inline]
+    fn sections<'data, R: ReadRef<'data>>(
+        &self,
+        data: R,
+        offset: u64,
+    ) -> read::Result<SectionTable<'data>> {
+        SectionTable::parse(self, data, offset)
+    }
+
+    /// Read the symbol table and string table.
+    ///
+    /// `data` must be the entire file data.
+    #[inline]
+    fn symbols<'data, R: ReadRef<'data>>(
+        &self,
+        data: R,
+    ) -> read::Result<SymbolTable<'data, R, Self>> {
+        SymbolTable::parse(self, data)
+    }
+}
+
+impl CoffHeader for pe::ImageFileHeader {
+    type ImageSymbol = pe::ImageSymbol;
+    type ImageSymbolBytes = pe::ImageSymbolBytes;
+
+    fn is_type_bigobj() -> bool {
+        false
+    }
+
+    fn machine(&self) -> u16 {
+        self.machine.get(LE)
+    }
+
+    fn number_of_sections(&self) -> u32 {
+        self.number_of_sections.get(LE).into()
+    }
+
+    fn pointer_to_symbol_table(&self) -> u32 {
+        self.pointer_to_symbol_table.get(LE)
+    }
+
+    fn number_of_symbols(&self) -> u32 {
+        self.number_of_symbols.get(LE)
+    }
+
+    fn characteristics(&self) -> u16 {
+        self.characteristics.get(LE)
+    }
+
+    fn parse<'data, R: ReadRef<'data>>(data: R, offset: &mut u64) -> read::Result<&'data Self> {
+        let header = data
+            .read::<pe::ImageFileHeader>(offset)
+            .read_error("Invalid COFF file header size or alignment")?;
+
+        // Skip over the optional header.
+        *offset = offset
+            .checked_add(header.size_of_optional_header.get(LE).into())
+            .read_error("Invalid COFF optional header size")?;
+
+        // TODO: maybe validate that the machine is known?
+        Ok(header)
+    }
+}
+
+impl CoffHeader for pe::AnonObjectHeaderBigobj {
+    type ImageSymbol = pe::ImageSymbolEx;
+    type ImageSymbolBytes = pe::ImageSymbolExBytes;
+
+    fn is_type_bigobj() -> bool {
+        true
+    }
+
+    fn machine(&self) -> u16 {
+        self.machine.get(LE)
+    }
+
+    fn number_of_sections(&self) -> u32 {
+        self.number_of_sections.get(LE)
+    }
+
+    fn pointer_to_symbol_table(&self) -> u32 {
+        self.pointer_to_symbol_table.get(LE)
+    }
+
+    fn number_of_symbols(&self) -> u32 {
+        self.number_of_symbols.get(LE)
+    }
+
+    fn characteristics(&self) -> u16 {
+        0
+    }
+
+    fn parse<'data, R: ReadRef<'data>>(data: R, offset: &mut u64) -> read::Result<&'data Self> {
+        let header = data
+            .read::<pe::AnonObjectHeaderBigobj>(offset)
+            .read_error("Invalid COFF bigobj file header size or alignment")?;
+
+        if header.sig1.get(LE) != pe::IMAGE_FILE_MACHINE_UNKNOWN
+            || header.sig2.get(LE) != 0xffff
+            || header.version.get(LE) < 2
+            || header.class_id != pe::ANON_OBJECT_HEADER_BIGOBJ_CLASS_ID
+        {
+            return Err(read::Error("Invalid COFF bigobj header values"));
+        }
+
+        // TODO: maybe validate that the machine is known?
+        Ok(header)
+    }
+}

vendor/object/src/read/coff/import.rs

@@ -0,0 +1,220 @@
+//! Support for reading short import files.
+//!
+//! These are used by some Windows linkers as a more compact way to describe
+//! dynamically imported symbols.
+
+use crate::read::{Architecture, Error, ReadError, ReadRef, Result};
+use crate::{pe, ByteString, Bytes, LittleEndian as LE, SubArchitecture};
+
+/// A Windows short form description of a symbol to import.
+///
+/// Used in Windows import libraries to provide a mapping from
+/// a symbol name to a DLL export. This is not an object file.
+///
+/// This is a file that starts with [`pe::ImportObjectHeader`], and corresponds
+/// to [`crate::FileKind::CoffImport`].
+#[derive(Debug, Clone)]
+pub struct ImportFile<'data> {
+    header: &'data pe::ImportObjectHeader,
+    kind: ImportType,
+    dll: ByteString<'data>,
+    symbol: ByteString<'data>,
+    import: Option<ByteString<'data>>,
+}
+
+impl<'data> ImportFile<'data> {
+    /// Parse it.
+    pub fn parse<R: ReadRef<'data>>(data: R) -> Result<Self> {
+        let mut offset = 0;
+        let header = pe::ImportObjectHeader::parse(data, &mut offset)?;
+        let data = header.parse_data(data, &mut offset)?;
+
+        // Unmangles a name by removing a `?`, `@` or `_` prefix.
+        fn strip_prefix(s: &[u8]) -> &[u8] {
+            match s.split_first() {
+                Some((b, rest)) if [b'?', b'@', b'_'].contains(b) => rest,
+                _ => s,
+            }
+        }
+        Ok(Self {
+            header,
+            dll: data.dll,
+            symbol: data.symbol,
+            kind: match header.import_type() {
+                pe::IMPORT_OBJECT_CODE => ImportType::Code,
+                pe::IMPORT_OBJECT_DATA => ImportType::Data,
+                pe::IMPORT_OBJECT_CONST => ImportType::Const,
+                _ => return Err(Error("Invalid COFF import library import type")),
+            },
+            import: match header.name_type() {
+                pe::IMPORT_OBJECT_ORDINAL => None,
+                pe::IMPORT_OBJECT_NAME => Some(data.symbol()),
+                pe::IMPORT_OBJECT_NAME_NO_PREFIX => Some(strip_prefix(data.symbol())),
+                pe::IMPORT_OBJECT_NAME_UNDECORATE => Some(
+                    strip_prefix(data.symbol())
+                        .split(|&b| b == b'@')
+                        .next()
+                        .unwrap(),
+                ),
+                pe::IMPORT_OBJECT_NAME_EXPORTAS => data.export(),
+                _ => return Err(Error("Unknown COFF import library name type")),
+            }
+            .map(ByteString),
+        })
+    }
+
+    /// Get the machine type.
+    pub fn architecture(&self) -> Architecture {
+        match self.header.machine.get(LE) {
+            pe::IMAGE_FILE_MACHINE_ARMNT => Architecture::Arm,
+            pe::IMAGE_FILE_MACHINE_ARM64 | pe::IMAGE_FILE_MACHINE_ARM64EC => Architecture::Aarch64,
+            pe::IMAGE_FILE_MACHINE_I386 => Architecture::I386,
+            pe::IMAGE_FILE_MACHINE_AMD64 => Architecture::X86_64,
+            _ => Architecture::Unknown,
+        }
+    }
+
+    /// Get the sub machine type, if available.
+    pub fn sub_architecture(&self) -> Option<SubArchitecture> {
+        match self.header.machine.get(LE) {
+            pe::IMAGE_FILE_MACHINE_ARM64EC => Some(SubArchitecture::Arm64EC),
+            _ => None,
+        }
+    }
+
+    /// The public symbol name.
+    pub fn symbol(&self) -> &'data [u8] {
+        self.symbol.0
+    }
+
+    /// The name of the DLL to import the symbol from.
+    pub fn dll(&self) -> &'data [u8] {
+        self.dll.0
+    }
+
+    /// The name exported from the DLL.
+    pub fn import(&self) -> ImportName<'data> {
+        match self.import {
+            Some(name) => ImportName::Name(name.0),
+            None => ImportName::Ordinal(self.header.ordinal_or_hint.get(LE)),
+        }
+    }
+
+    /// The type of import. Usually either a function or data.
+    pub fn import_type(&self) -> ImportType {
+        self.kind
+    }
+}
+
+/// The name or ordinal to import from a DLL.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum ImportName<'data> {
+    /// Import by ordinal. Ordinarily this is a 1-based index.
+    Ordinal(u16),
+    /// Import by name.
+    Name(&'data [u8]),
+}
+
+/// The kind of import symbol.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub enum ImportType {
+    /// An executable code symbol.
+    Code,
+    /// A data symbol.
+    Data,
+    /// A constant value.
+    Const,
+}
+
+impl pe::ImportObjectHeader {
+    /// Read the short import header.
+    ///
+    /// Also checks that the signature and version are valid.
+    /// Directly following this header will be the string data.
+    pub fn parse<'data, R: ReadRef<'data>>(data: R, offset: &mut u64) -> Result<&'data Self> {
+        let header = data
+            .read::<pe::ImportObjectHeader>(offset)
+            .read_error("Invalid COFF import library header size")?;
+        if header.sig1.get(LE) != 0 || header.sig2.get(LE) != pe::IMPORT_OBJECT_HDR_SIG2 {
+            Err(Error("Invalid COFF import library header"))
+        } else if header.version.get(LE) != 0 {
+            Err(Error("Unknown COFF import library header version"))
+        } else {
+            Ok(header)
+        }
+    }
+
+    /// Parse the data following the header.
+    pub fn parse_data<'data, R: ReadRef<'data>>(
+        &self,
+        data: R,
+        offset: &mut u64,
+    ) -> Result<ImportObjectData<'data>> {
+        let mut data = Bytes(
+            data.read_bytes(offset, u64::from(self.size_of_data.get(LE)))
+                .read_error("Invalid COFF import library data size")?,
+        );
+        let symbol = data
+            .read_string()
+            .map(ByteString)
+            .read_error("Could not read COFF import library symbol name")?;
+        let dll = data
+            .read_string()
+            .map(ByteString)
+            .read_error("Could not read COFF import library DLL name")?;
+        let export = if self.name_type() == pe::IMPORT_OBJECT_NAME_EXPORTAS {
+            data.read_string()
+                .map(ByteString)
+                .map(Some)
+                .read_error("Could not read COFF import library export name")?
+        } else {
+            None
+        };
+        Ok(ImportObjectData {
+            symbol,
+            dll,
+            export,
+        })
+    }
+
+    /// The type of import.
+    ///
+    /// This is one of the `IMPORT_OBJECT_*` constants.
+    pub fn import_type(&self) -> u16 {
+        self.name_type.get(LE) & pe::IMPORT_OBJECT_TYPE_MASK
+    }
+
+    /// The type of import name.
+    ///
+    /// This is one of the `IMPORT_OBJECT_*` constants.
+    pub fn name_type(&self) -> u16 {
+        (self.name_type.get(LE) >> pe::IMPORT_OBJECT_NAME_SHIFT) & pe::IMPORT_OBJECT_NAME_MASK
+    }
+}
+
+/// The data following [`pe::ImportObjectHeader`].
+#[derive(Debug, Clone)]
+pub struct ImportObjectData<'data> {
+    symbol: ByteString<'data>,
+    dll: ByteString<'data>,
+    export: Option<ByteString<'data>>,
+}
+
+impl<'data> ImportObjectData<'data> {
+    /// The public symbol name.
+    pub fn symbol(&self) -> &'data [u8] {
+        self.symbol.0
+    }
+
+    /// The name of the DLL to import the symbol from.
+    pub fn dll(&self) -> &'data [u8] {
+        self.dll.0
+    }
+
+    /// The name exported from the DLL.
+    ///
+    /// This is only set if the name is not derived from the symbol name.
+    pub fn export(&self) -> Option<&'data [u8]> {
+        self.export.map(|export| export.0)
+    }
+}

vendor/object/src/read/coff/mod.rs

@@ -0,0 +1,66 @@
+//! Support for reading Windows COFF files.
+//!
+//! Traits are used to abstract over the difference between COFF object files
+//! and COFF bigobj files. The primary trait for this is [`CoffHeader`].
+//!
+//! ## High level API
+//!
+//! [`CoffFile`] implements the [`Object`](crate::read::Object) trait for
+//! COFF files. [`CoffFile`] is parameterised by [`CoffHeader`].
+//! The default parameter allows reading regular COFF object files,
+//! while the type alias [`CoffBigFile`] allows reading COFF bigobj files.
+//!
+//! [`ImportFile`] allows reading COFF short imports that are used in import
+//! libraries. Currently these are not integrated with the unified read API.
+//!
+//! ## Low level API
+//!
+//! The [`CoffHeader`] trait can be directly used to parse both COFF
+//! object files (which start with [`pe::ImageFileHeader`]) and COFF bigobj
+//! files (which start with [`pe::AnonObjectHeaderBigobj`]).
+//!
+//! ### Example for low level API
+//!  ```no_run
+//! use object::pe;
+//! use object::read::coff::{CoffHeader, ImageSymbol as _};
+//! use std::error::Error;
+//! use std::fs;
+//!
+//! /// Reads a file and displays the name of each section and symbol.
+//! fn main() -> Result<(), Box<dyn Error>> {
+//! #   #[cfg(feature = "std")] {
+//!     let data = fs::read("path/to/binary")?;
+//!     let mut offset = 0;
+//!     let header = pe::ImageFileHeader::parse(&*data, &mut offset)?;
+//!     let sections = header.sections(&*data, offset)?;
+//!     let symbols = header.symbols(&*data)?;
+//!     for section in sections.iter() {
+//!         println!("{}", String::from_utf8_lossy(section.name(symbols.strings())?));
+//!     }
+//!     for (_index, symbol) in symbols.iter() {
+//!         println!("{}", String::from_utf8_lossy(symbol.name(symbols.strings())?));
+//!     }
+//! #   }
+//!     Ok(())
+//! }
+//! ```
+#[cfg(doc)]
+use crate::pe;
+
+mod file;
+pub use file::*;
+
+mod section;
+pub use section::*;
+
+mod symbol;
+pub use symbol::*;
+
+mod relocation;
+pub use relocation::*;
+
+mod comdat;
+pub use comdat::*;
+
+mod import;
+pub use import::*;

vendor/object/src/read/coff/relocation.rs

@@ -0,0 +1,106 @@
+use alloc::fmt;
+use core::slice;
+
+use crate::endian::LittleEndian as LE;
+use crate::pe;
+use crate::read::{
+    ReadRef, Relocation, RelocationEncoding, RelocationKind, RelocationTarget, SymbolIndex,
+};
+
+use super::{CoffFile, CoffHeader};
+
+/// An iterator for the relocations in a [`CoffBigSection`](super::CoffBigSection).
+pub type CoffBigRelocationIterator<'data, 'file, R = &'data [u8]> =
+    CoffRelocationIterator<'data, 'file, R, pe::AnonObjectHeaderBigobj>;
+
+/// An iterator for the relocations in a [`CoffSection`](super::CoffSection).
+pub struct CoffRelocationIterator<
+    'data,
+    'file,
+    R: ReadRef<'data> = &'data [u8],
+    Coff: CoffHeader = pe::ImageFileHeader,
+> {
+    pub(super) file: &'file CoffFile<'data, R, Coff>,
+    pub(super) iter: slice::Iter<'data, pe::ImageRelocation>,
+}
+
+impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> Iterator
+    for CoffRelocationIterator<'data, 'file, R, Coff>
+{
+    type Item = (u64, Relocation);
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.iter.next().map(|relocation| {
+            let (kind, size, addend) = match self.file.header.machine() {
+                pe::IMAGE_FILE_MACHINE_ARMNT => match relocation.typ.get(LE) {
+                    pe::IMAGE_REL_ARM_ADDR32 => (RelocationKind::Absolute, 32, 0),
+                    pe::IMAGE_REL_ARM_ADDR32NB => (RelocationKind::ImageOffset, 32, 0),
+                    pe::IMAGE_REL_ARM_REL32 => (RelocationKind::Relative, 32, -4),
+                    pe::IMAGE_REL_ARM_SECTION => (RelocationKind::SectionIndex, 16, 0),
+                    pe::IMAGE_REL_ARM_SECREL => (RelocationKind::SectionOffset, 32, 0),
+                    typ => (RelocationKind::Coff(typ), 0, 0),
+                },
+                pe::IMAGE_FILE_MACHINE_ARM64 | pe::IMAGE_FILE_MACHINE_ARM64EC => {
+                    match relocation.typ.get(LE) {
+                        pe::IMAGE_REL_ARM64_ADDR32 => (RelocationKind::Absolute, 32, 0),
+                        pe::IMAGE_REL_ARM64_ADDR32NB => (RelocationKind::ImageOffset, 32, 0),
+                        pe::IMAGE_REL_ARM64_SECREL => (RelocationKind::SectionOffset, 32, 0),
+                        pe::IMAGE_REL_ARM64_SECTION => (RelocationKind::SectionIndex, 16, 0),
+                        pe::IMAGE_REL_ARM64_ADDR64 => (RelocationKind::Absolute, 64, 0),
+                        pe::IMAGE_REL_ARM64_REL32 => (RelocationKind::Relative, 32, -4),
+                        typ => (RelocationKind::Coff(typ), 0, 0),
+                    }
+                }
+                pe::IMAGE_FILE_MACHINE_I386 => match relocation.typ.get(LE) {
+                    pe::IMAGE_REL_I386_DIR16 => (RelocationKind::Absolute, 16, 0),
+                    pe::IMAGE_REL_I386_REL16 => (RelocationKind::Relative, 16, 0),
+                    pe::IMAGE_REL_I386_DIR32 => (RelocationKind::Absolute, 32, 0),
+                    pe::IMAGE_REL_I386_DIR32NB => (RelocationKind::ImageOffset, 32, 0),
+                    pe::IMAGE_REL_I386_SECTION => (RelocationKind::SectionIndex, 16, 0),
+                    pe::IMAGE_REL_I386_SECREL => (RelocationKind::SectionOffset, 32, 0),
+                    pe::IMAGE_REL_I386_SECREL7 => (RelocationKind::SectionOffset, 7, 0),
+                    pe::IMAGE_REL_I386_REL32 => (RelocationKind::Relative, 32, -4),
+                    typ => (RelocationKind::Coff(typ), 0, 0),
+                },
+                pe::IMAGE_FILE_MACHINE_AMD64 => match relocation.typ.get(LE) {
+                    pe::IMAGE_REL_AMD64_ADDR64 => (RelocationKind::Absolute, 64, 0),
+                    pe::IMAGE_REL_AMD64_ADDR32 => (RelocationKind::Absolute, 32, 0),
+                    pe::IMAGE_REL_AMD64_ADDR32NB => (RelocationKind::ImageOffset, 32, 0),
+                    pe::IMAGE_REL_AMD64_REL32 => (RelocationKind::Relative, 32, -4),
+                    pe::IMAGE_REL_AMD64_REL32_1 => (RelocationKind::Relative, 32, -5),
+                    pe::IMAGE_REL_AMD64_REL32_2 => (RelocationKind::Relative, 32, -6),
+                    pe::IMAGE_REL_AMD64_REL32_3 => (RelocationKind::Relative, 32, -7),
+                    pe::IMAGE_REL_AMD64_REL32_4 => (RelocationKind::Relative, 32, -8),
+                    pe::IMAGE_REL_AMD64_REL32_5 => (RelocationKind::Relative, 32, -9),
+                    pe::IMAGE_REL_AMD64_SECTION => (RelocationKind::SectionIndex, 16, 0),
+                    pe::IMAGE_REL_AMD64_SECREL => (RelocationKind::SectionOffset, 32, 0),
+                    pe::IMAGE_REL_AMD64_SECREL7 => (RelocationKind::SectionOffset, 7, 0),
+                    typ => (RelocationKind::Coff(typ), 0, 0),
+                },
+                _ => (RelocationKind::Coff(relocation.typ.get(LE)), 0, 0),
+            };
+            let target = RelocationTarget::Symbol(SymbolIndex(
+                relocation.symbol_table_index.get(LE) as usize,
+            ));
+            (
+                u64::from(relocation.virtual_address.get(LE)),
+                Relocation {
+                    kind,
+                    encoding: RelocationEncoding::Generic,
+                    size,
+                    target,
+                    addend,
+                    implicit_addend: true,
+                },
+            )
+        })
+    }
+}
+
+impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> fmt::Debug
+    for CoffRelocationIterator<'data, 'file, R, Coff>
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("CoffRelocationIterator").finish()
+    }
+}

vendor/object/src/read/coff/section.rs

@@ -0,0 +1,585 @@
+use core::convert::TryFrom;
+use core::{iter, result, slice, str};
+
+use crate::endian::LittleEndian as LE;
+use crate::pe;
+use crate::read::util::StringTable;
+use crate::read::{
+    self, CompressedData, CompressedFileRange, Error, ObjectSection, ObjectSegment, ReadError,
+    ReadRef, Result, SectionFlags, SectionIndex, SectionKind, SegmentFlags,
+};
+
+use super::{CoffFile, CoffHeader, CoffRelocationIterator};
+
+/// The table of section headers in a COFF or PE file.
+///
+/// Returned by [`CoffHeader::sections`] and
+/// [`ImageNtHeaders::sections`](crate::read::pe::ImageNtHeaders::sections).
+#[derive(Debug, Default, Clone, Copy)]
+pub struct SectionTable<'data> {
+    sections: &'data [pe::ImageSectionHeader],
+}
+
+impl<'data> SectionTable<'data> {
+    /// Parse the section table.
+    ///
+    /// `data` must be the entire file data.
+    /// `offset` must be after the optional file header.
+    pub fn parse<Coff: CoffHeader, R: ReadRef<'data>>(
+        header: &Coff,
+        data: R,
+        offset: u64,
+    ) -> Result<Self> {
+        let sections = data
+            .read_slice_at(offset, header.number_of_sections() as usize)
+            .read_error("Invalid COFF/PE section headers")?;
+        Ok(SectionTable { sections })
+    }
+
+    /// Iterate over the section headers.
+    ///
+    /// Warning: sections indices start at 1.
+    #[inline]
+    pub fn iter(&self) -> slice::Iter<'data, pe::ImageSectionHeader> {
+        self.sections.iter()
+    }
+
+    /// Return true if the section table is empty.
+    #[inline]
+    pub fn is_empty(&self) -> bool {
+        self.sections.is_empty()
+    }
+
+    /// The number of section headers.
+    #[inline]
+    pub fn len(&self) -> usize {
+        self.sections.len()
+    }
+
+    /// Return the section header at the given index.
+    ///
+    /// The index is 1-based.
+    pub fn section(&self, index: usize) -> read::Result<&'data pe::ImageSectionHeader> {
+        self.sections
+            .get(index.wrapping_sub(1))
+            .read_error("Invalid COFF/PE section index")
+    }
+
+    /// Return the section header with the given name.
+    ///
+    /// The returned index is 1-based.
+    ///
+    /// Ignores sections with invalid names.
+    pub fn section_by_name<R: ReadRef<'data>>(
+        &self,
+        strings: StringTable<'data, R>,
+        name: &[u8],
+    ) -> Option<(usize, &'data pe::ImageSectionHeader)> {
+        self.sections
+            .iter()
+            .enumerate()
+            .find(|(_, section)| section.name(strings) == Ok(name))
+            .map(|(index, section)| (index + 1, section))
+    }
+
+    /// Compute the maximum file offset used by sections.
+    ///
+    /// This will usually match the end of file, unless the PE file has a
+    /// [data overlay](https://security.stackexchange.com/questions/77336/how-is-the-file-overlay-read-by-an-exe-virus)
+    pub fn max_section_file_offset(&self) -> u64 {
+        let mut max = 0;
+        for section in self.iter() {
+            match (section.pointer_to_raw_data.get(LE) as u64)
+                .checked_add(section.size_of_raw_data.get(LE) as u64)
+            {
+                None => {
+                    // This cannot happen, we're suming two u32 into a u64
+                    continue;
+                }
+                Some(end_of_section) => {
+                    if end_of_section > max {
+                        max = end_of_section;
+                    }
+                }
+            }
+        }
+        max
+    }
+}
+
+/// An iterator for the loadable sections in a [`CoffBigFile`](super::CoffBigFile).
+pub type CoffBigSegmentIterator<'data, 'file, R = &'data [u8]> =
+    CoffSegmentIterator<'data, 'file, R, pe::AnonObjectHeaderBigobj>;
+
+/// An iterator for the loadable sections in a [`CoffFile`].
+#[derive(Debug)]
+pub struct CoffSegmentIterator<
+    'data,
+    'file,
+    R: ReadRef<'data> = &'data [u8],
+    Coff: CoffHeader = pe::ImageFileHeader,
+> {
+    pub(super) file: &'file CoffFile<'data, R, Coff>,
+    pub(super) iter: slice::Iter<'data, pe::ImageSectionHeader>,
+}
+
+impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> Iterator
+    for CoffSegmentIterator<'data, 'file, R, Coff>
+{
+    type Item = CoffSegment<'data, 'file, R, Coff>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.iter.next().map(|section| CoffSegment {
+            file: self.file,
+            section,
+        })
+    }
+}
+
+/// A loadable section in a [`CoffBigFile`](super::CoffBigFile).
+///
+/// Most functionality is provided by the [`ObjectSegment`] trait implementation.
+pub type CoffBigSegment<'data, 'file, R = &'data [u8]> =
+    CoffSegment<'data, 'file, R, pe::AnonObjectHeaderBigobj>;
+
+/// A loadable section in a [`CoffFile`].
+///
+/// Most functionality is provided by the [`ObjectSegment`] trait implementation.
+#[derive(Debug)]
+pub struct CoffSegment<
+    'data,
+    'file,
+    R: ReadRef<'data> = &'data [u8],
+    Coff: CoffHeader = pe::ImageFileHeader,
+> {
+    pub(super) file: &'file CoffFile<'data, R, Coff>,
+    pub(super) section: &'data pe::ImageSectionHeader,
+}
+
+impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> CoffSegment<'data, 'file, R, Coff> {
+    fn bytes(&self) -> Result<&'data [u8]> {
+        self.section
+            .coff_data(self.file.data)
+            .read_error("Invalid COFF section offset or size")
+    }
+}
+
+impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> read::private::Sealed
+    for CoffSegment<'data, 'file, R, Coff>
+{
+}
+
+impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> ObjectSegment<'data>
+    for CoffSegment<'data, 'file, R, Coff>
+{
+    #[inline]
+    fn address(&self) -> u64 {
+        u64::from(self.section.virtual_address.get(LE))
+    }
+
+    #[inline]
+    fn size(&self) -> u64 {
+        u64::from(self.section.virtual_size.get(LE))
+    }
+
+    #[inline]
+    fn align(&self) -> u64 {
+        self.section.coff_alignment()
+    }
+
+    #[inline]
+    fn file_range(&self) -> (u64, u64) {
+        let (offset, size) = self.section.coff_file_range().unwrap_or((0, 0));
+        (u64::from(offset), u64::from(size))
+    }
+
+    fn data(&self) -> Result<&'data [u8]> {
+        self.bytes()
+    }
+
+    fn data_range(&self, address: u64, size: u64) -> Result<Option<&'data [u8]>> {
+        Ok(read::util::data_range(
+            self.bytes()?,
+            self.address(),
+            address,
+            size,
+        ))
+    }
+
+    #[inline]
+    fn name_bytes(&self) -> Result<Option<&[u8]>> {
+        self.section
+            .name(self.file.common.symbols.strings())
+            .map(Some)
+    }
+
+    #[inline]
+    fn name(&self) -> Result<Option<&str>> {
+        let name = self.section.name(self.file.common.symbols.strings())?;
+        str::from_utf8(name)
+            .ok()
+            .read_error("Non UTF-8 COFF section name")
+            .map(Some)
+    }
+
+    #[inline]
+    fn flags(&self) -> SegmentFlags {
+        let characteristics = self.section.characteristics.get(LE);
+        SegmentFlags::Coff { characteristics }
+    }
+}
+
+/// An iterator for the sections in a [`CoffBigFile`](super::CoffBigFile).
+pub type CoffBigSectionIterator<'data, 'file, R = &'data [u8]> =
+    CoffSectionIterator<'data, 'file, R, pe::AnonObjectHeaderBigobj>;
+
+/// An iterator for the sections in a [`CoffFile`].
+#[derive(Debug)]
+pub struct CoffSectionIterator<
+    'data,
+    'file,
+    R: ReadRef<'data> = &'data [u8],
+    Coff: CoffHeader = pe::ImageFileHeader,
+> {
+    pub(super) file: &'file CoffFile<'data, R, Coff>,
+    pub(super) iter: iter::Enumerate<slice::Iter<'data, pe::ImageSectionHeader>>,
+}
+
+impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> Iterator
+    for CoffSectionIterator<'data, 'file, R, Coff>
+{
+    type Item = CoffSection<'data, 'file, R, Coff>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.iter.next().map(|(index, section)| CoffSection {
+            file: self.file,
+            index: SectionIndex(index + 1),
+            section,
+        })
+    }
+}
+
+/// A section in a [`CoffBigFile`](super::CoffBigFile).
+///
+/// Most functionality is provided by the [`ObjectSection`] trait implementation.
+pub type CoffBigSection<'data, 'file, R = &'data [u8]> =
+    CoffSection<'data, 'file, R, pe::AnonObjectHeaderBigobj>;
+
+/// A section in a [`CoffFile`].
+///
+/// Most functionality is provided by the [`ObjectSection`] trait implementation.
+#[derive(Debug)]
+pub struct CoffSection<
+    'data,
+    'file,
+    R: ReadRef<'data> = &'data [u8],
+    Coff: CoffHeader = pe::ImageFileHeader,
+> {
+    pub(super) file: &'file CoffFile<'data, R, Coff>,
+    pub(super) index: SectionIndex,
+    pub(super) section: &'data pe::ImageSectionHeader,
+}
+
+impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> CoffSection<'data, 'file, R, Coff> {
+    fn bytes(&self) -> Result<&'data [u8]> {
+        self.section
+            .coff_data(self.file.data)
+            .read_error("Invalid COFF section offset or size")
+    }
+}
+
+impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> read::private::Sealed
+    for CoffSection<'data, 'file, R, Coff>
+{
+}
+
+impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> ObjectSection<'data>
+    for CoffSection<'data, 'file, R, Coff>
+{
+    type RelocationIterator = CoffRelocationIterator<'data, 'file, R, Coff>;
+
+    #[inline]
+    fn index(&self) -> SectionIndex {
+        self.index
+    }
+
+    #[inline]
+    fn address(&self) -> u64 {
+        u64::from(self.section.virtual_address.get(LE))
+    }
+
+    #[inline]
+    fn size(&self) -> u64 {
+        // TODO: This may need to be the length from the auxiliary symbol for this section.
+        u64::from(self.section.size_of_raw_data.get(LE))
+    }
+
+    #[inline]
+    fn align(&self) -> u64 {
+        self.section.coff_alignment()
+    }
+
+    #[inline]
+    fn file_range(&self) -> Option<(u64, u64)> {
+        let (offset, size) = self.section.coff_file_range()?;
+        Some((u64::from(offset), u64::from(size)))
+    }
+
+    fn data(&self) -> Result<&'data [u8]> {
+        self.bytes()
+    }
+
+    fn data_range(&self, address: u64, size: u64) -> Result<Option<&'data [u8]>> {
+        Ok(read::util::data_range(
+            self.bytes()?,
+            self.address(),
+            address,
+            size,
+        ))
+    }
+
+    #[inline]
+    fn compressed_file_range(&self) -> Result<CompressedFileRange> {
+        Ok(CompressedFileRange::none(self.file_range()))
+    }
+
+    #[inline]
+    fn compressed_data(&self) -> Result<CompressedData<'data>> {
+        self.data().map(CompressedData::none)
+    }
+
+    #[inline]
+    fn name_bytes(&self) -> Result<&[u8]> {
+        self.section.name(self.file.common.symbols.strings())
+    }
+
+    #[inline]
+    fn name(&self) -> Result<&str> {
+        let name = self.name_bytes()?;
+        str::from_utf8(name)
+            .ok()
+            .read_error("Non UTF-8 COFF section name")
+    }
+
+    #[inline]
+    fn segment_name_bytes(&self) -> Result<Option<&[u8]>> {
+        Ok(None)
+    }
+
+    #[inline]
+    fn segment_name(&self) -> Result<Option<&str>> {
+        Ok(None)
+    }
+
+    #[inline]
+    fn kind(&self) -> SectionKind {
+        self.section.kind()
+    }
+
+    fn relocations(&self) -> CoffRelocationIterator<'data, 'file, R, Coff> {
+        let relocations = self.section.coff_relocations(self.file.data).unwrap_or(&[]);
+        CoffRelocationIterator {
+            file: self.file,
+            iter: relocations.iter(),
+        }
+    }
+
+    fn flags(&self) -> SectionFlags {
+        SectionFlags::Coff {
+            characteristics: self.section.characteristics.get(LE),
+        }
+    }
+}
+
+impl pe::ImageSectionHeader {
+    pub(crate) fn kind(&self) -> SectionKind {
+        let characteristics = self.characteristics.get(LE);
+        if characteristics & (pe::IMAGE_SCN_CNT_CODE | pe::IMAGE_SCN_MEM_EXECUTE) != 0 {
+            SectionKind::Text
+        } else if characteristics & pe::IMAGE_SCN_CNT_INITIALIZED_DATA != 0 {
+            if characteristics & pe::IMAGE_SCN_MEM_DISCARDABLE != 0 {
+                SectionKind::Other
+            } else if characteristics & pe::IMAGE_SCN_MEM_WRITE != 0 {
+                SectionKind::Data
+            } else {
+                SectionKind::ReadOnlyData
+            }
+        } else if characteristics & pe::IMAGE_SCN_CNT_UNINITIALIZED_DATA != 0 {
+            SectionKind::UninitializedData
+        } else if characteristics & pe::IMAGE_SCN_LNK_INFO != 0 {
+            SectionKind::Linker
+        } else {
+            SectionKind::Unknown
+        }
+    }
+}
+
+impl pe::ImageSectionHeader {
+    /// Return the string table offset of the section name.
+    ///
+    /// Returns `Ok(None)` if the name doesn't use the string table
+    /// and can be obtained with `raw_name` instead.
+    pub fn name_offset(&self) -> Result<Option<u32>> {
+        let bytes = &self.name;
+        if bytes[0] != b'/' {
+            return Ok(None);
+        }
+
+        if bytes[1] == b'/' {
+            let mut offset = 0;
+            for byte in bytes[2..].iter() {
+                let digit = match byte {
+                    b'A'..=b'Z' => byte - b'A',
+                    b'a'..=b'z' => byte - b'a' + 26,
+                    b'0'..=b'9' => byte - b'0' + 52,
+                    b'+' => 62,
+                    b'/' => 63,
+                    _ => return Err(Error("Invalid COFF section name base-64 offset")),
+                };
+                offset = offset * 64 + digit as u64;
+            }
+            u32::try_from(offset)
+                .ok()
+                .read_error("Invalid COFF section name base-64 offset")
+                .map(Some)
+        } else {
+            let mut offset = 0;
+            for byte in bytes[1..].iter() {
+                let digit = match byte {
+                    b'0'..=b'9' => byte - b'0',
+                    0 => break,
+                    _ => return Err(Error("Invalid COFF section name base-10 offset")),
+                };
+                offset = offset * 10 + digit as u32;
+            }
+            Ok(Some(offset))
+        }
+    }
+
+    /// Return the section name.
+    ///
+    /// This handles decoding names that are offsets into the symbol string table.
+    pub fn name<'data, R: ReadRef<'data>>(
+        &'data self,
+        strings: StringTable<'data, R>,
+    ) -> Result<&'data [u8]> {
+        if let Some(offset) = self.name_offset()? {
+            strings
+                .get(offset)
+                .read_error("Invalid COFF section name offset")
+        } else {
+            Ok(self.raw_name())
+        }
+    }
+
+    /// Return the raw section name.
+    pub fn raw_name(&self) -> &[u8] {
+        let bytes = &self.name;
+        match memchr::memchr(b'\0', bytes) {
+            Some(end) => &bytes[..end],
+            None => &bytes[..],
+        }
+    }
+
+    /// Return the offset and size of the section in a COFF file.
+    ///
+    /// Returns `None` for sections that have no data in the file.
+    pub fn coff_file_range(&self) -> Option<(u32, u32)> {
+        if self.characteristics.get(LE) & pe::IMAGE_SCN_CNT_UNINITIALIZED_DATA != 0 {
+            None
+        } else {
+            let offset = self.pointer_to_raw_data.get(LE);
+            // Note: virtual size is not used for COFF.
+            let size = self.size_of_raw_data.get(LE);
+            Some((offset, size))
+        }
+    }
+
+    /// Return the section data in a COFF file.
+    ///
+    /// Returns `Ok(&[])` if the section has no data.
+    /// Returns `Err` for invalid values.
+    pub fn coff_data<'data, R: ReadRef<'data>>(&self, data: R) -> result::Result<&'data [u8], ()> {
+        if let Some((offset, size)) = self.coff_file_range() {
+            data.read_bytes_at(offset.into(), size.into())
+        } else {
+            Ok(&[])
+        }
+    }
+
+    /// Return the section alignment in bytes.
+    ///
+    /// This is only valid for sections in a COFF file.
+    pub fn coff_alignment(&self) -> u64 {
+        match self.characteristics.get(LE) & pe::IMAGE_SCN_ALIGN_MASK {
+            pe::IMAGE_SCN_ALIGN_1BYTES => 1,
+            pe::IMAGE_SCN_ALIGN_2BYTES => 2,
+            pe::IMAGE_SCN_ALIGN_4BYTES => 4,
+            pe::IMAGE_SCN_ALIGN_8BYTES => 8,
+            pe::IMAGE_SCN_ALIGN_16BYTES => 16,
+            pe::IMAGE_SCN_ALIGN_32BYTES => 32,
+            pe::IMAGE_SCN_ALIGN_64BYTES => 64,
+            pe::IMAGE_SCN_ALIGN_128BYTES => 128,
+            pe::IMAGE_SCN_ALIGN_256BYTES => 256,
+            pe::IMAGE_SCN_ALIGN_512BYTES => 512,
+            pe::IMAGE_SCN_ALIGN_1024BYTES => 1024,
+            pe::IMAGE_SCN_ALIGN_2048BYTES => 2048,
+            pe::IMAGE_SCN_ALIGN_4096BYTES => 4096,
+            pe::IMAGE_SCN_ALIGN_8192BYTES => 8192,
+            _ => 16,
+        }
+    }
+
+    /// Read the relocations in a COFF file.
+    ///
+    /// `data` must be the entire file data.
+    pub fn coff_relocations<'data, R: ReadRef<'data>>(
+        &self,
+        data: R,
+    ) -> read::Result<&'data [pe::ImageRelocation]> {
+        let mut pointer = self.pointer_to_relocations.get(LE).into();
+        let mut number: usize = self.number_of_relocations.get(LE).into();
+        if number == core::u16::MAX.into()
+            && self.characteristics.get(LE) & pe::IMAGE_SCN_LNK_NRELOC_OVFL != 0
+        {
+            // Extended relocations. Read first relocation (which contains extended count) & adjust
+            // relocations pointer.
+            let extended_relocation_info = data
+                .read_at::<pe::ImageRelocation>(pointer)
+                .read_error("Invalid COFF relocation offset or number")?;
+            number = extended_relocation_info.virtual_address.get(LE) as usize;
+            if number == 0 {
+                return Err(Error("Invalid COFF relocation number"));
+            }
+            pointer += core::mem::size_of::<pe::ImageRelocation>() as u64;
+            // Extended relocation info does not contribute to the count of sections.
+            number -= 1;
+        }
+        data.read_slice_at(pointer, number)
+            .read_error("Invalid COFF relocation offset or number")
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn name_offset() {
+        let mut section = pe::ImageSectionHeader::default();
+        section.name = *b"xxxxxxxx";
+        assert_eq!(section.name_offset(), Ok(None));
+        section.name = *b"/0\0\0\0\0\0\0";
+        assert_eq!(section.name_offset(), Ok(Some(0)));
+        section.name = *b"/9999999";
+        assert_eq!(section.name_offset(), Ok(Some(999_9999)));
+        section.name = *b"//AAAAAA";
+        assert_eq!(section.name_offset(), Ok(Some(0)));
+        section.name = *b"//D/////";
+        assert_eq!(section.name_offset(), Ok(Some(0xffff_ffff)));
+        section.name = *b"//EAAAAA";
+        assert!(section.name_offset().is_err());
+        section.name = *b"////////";
+        assert!(section.name_offset().is_err());
+    }
+}

vendor/object/src/read/coff/symbol.rs

@@ -0,0 +1,635 @@
+use alloc::fmt;
+use alloc::vec::Vec;
+use core::convert::TryInto;
+use core::fmt::Debug;
+use core::str;
+
+use super::{CoffCommon, CoffHeader, SectionTable};
+use crate::endian::{LittleEndian as LE, U32Bytes};
+use crate::pe;
+use crate::pod::{bytes_of, bytes_of_slice, Pod};
+use crate::read::util::StringTable;
+use crate::read::{
+    self, Bytes, ObjectSymbol, ObjectSymbolTable, ReadError, ReadRef, Result, SectionIndex,
+    SymbolFlags, SymbolIndex, SymbolKind, SymbolMap, SymbolMapEntry, SymbolScope, SymbolSection,
+};
+
+/// A table of symbol entries in a COFF or PE file.
+///
+/// Also includes the string table used for the symbol names.
+///
+/// Returned by [`CoffHeader::symbols`] and
+/// [`ImageNtHeaders::symbols`](crate::read::pe::ImageNtHeaders::symbols).
+#[derive(Debug)]
+pub struct SymbolTable<'data, R = &'data [u8], Coff = pe::ImageFileHeader>
+where
+    R: ReadRef<'data>,
+    Coff: CoffHeader,
+{
+    symbols: &'data [Coff::ImageSymbolBytes],
+    strings: StringTable<'data, R>,
+}
+
+impl<'data, R: ReadRef<'data>, Coff: CoffHeader> Default for SymbolTable<'data, R, Coff> {
+    fn default() -> Self {
+        Self {
+            symbols: &[],
+            strings: StringTable::default(),
+        }
+    }
+}
+
+impl<'data, R: ReadRef<'data>, Coff: CoffHeader> SymbolTable<'data, R, Coff> {
+    /// Read the symbol table.
+    pub fn parse(header: &Coff, data: R) -> Result<Self> {
+        // The symbol table may not be present.
+        let mut offset = header.pointer_to_symbol_table().into();
+        let (symbols, strings) = if offset != 0 {
+            let symbols = data
+                .read_slice(&mut offset, header.number_of_symbols() as usize)
+                .read_error("Invalid COFF symbol table offset or size")?;
+
+            // Note: don't update data when reading length; the length includes itself.
+            let length = data
+                .read_at::<U32Bytes<_>>(offset)
+                .read_error("Missing COFF string table")?
+                .get(LE);
+            let str_end = offset
+                .checked_add(length as u64)
+                .read_error("Invalid COFF string table length")?;
+            let strings = StringTable::new(data, offset, str_end);
+
+            (symbols, strings)
+        } else {
+            (&[][..], StringTable::default())
+        };
+
+        Ok(SymbolTable { symbols, strings })
+    }
+
+    /// Return the string table used for the symbol names.
+    #[inline]
+    pub fn strings(&self) -> StringTable<'data, R> {
+        self.strings
+    }
+
+    /// Return true if the symbol table is empty.
+    #[inline]
+    pub fn is_empty(&self) -> bool {
+        self.symbols.is_empty()
+    }
+
+    /// The number of symbol table entries.
+    ///
+    /// This includes auxiliary symbol table entries.
+    #[inline]
+    pub fn len(&self) -> usize {
+        self.symbols.len()
+    }
+
+    /// Iterate over the symbols.
+    #[inline]
+    pub fn iter<'table>(&'table self) -> SymbolIterator<'data, 'table, R, Coff> {
+        SymbolIterator {
+            symbols: self,
+            index: 0,
+        }
+    }
+
+    /// Return the symbol table entry at the given index.
+    #[inline]
+    pub fn symbol(&self, index: usize) -> Result<&'data Coff::ImageSymbol> {
+        self.get::<Coff::ImageSymbol>(index, 0)
+    }
+
+    /// Return the auxiliary function symbol for the symbol table entry at the given index.
+    ///
+    /// Note that the index is of the symbol, not the first auxiliary record.
+    #[inline]
+    pub fn aux_function(&self, index: usize) -> Result<&'data pe::ImageAuxSymbolFunction> {
+        self.get::<pe::ImageAuxSymbolFunction>(index, 1)
+    }
+
+    /// Return the auxiliary section symbol for the symbol table entry at the given index.
+    ///
+    /// Note that the index is of the symbol, not the first auxiliary record.
+    #[inline]
+    pub fn aux_section(&self, index: usize) -> Result<&'data pe::ImageAuxSymbolSection> {
+        self.get::<pe::ImageAuxSymbolSection>(index, 1)
+    }
+
+    /// Return the auxiliary file name for the symbol table entry at the given index.
+    ///
+    /// Note that the index is of the symbol, not the first auxiliary record.
+    pub fn aux_file_name(&self, index: usize, aux_count: u8) -> Result<&'data [u8]> {
+        let entries = index
+            .checked_add(1)
+            .and_then(|x| Some(x..x.checked_add(aux_count.into())?))
+            .and_then(|x| self.symbols.get(x))
+            .read_error("Invalid COFF symbol index")?;
+        let bytes = bytes_of_slice(entries);
+        // The name is padded with nulls.
+        Ok(match memchr::memchr(b'\0', bytes) {
+            Some(end) => &bytes[..end],
+            None => bytes,
+        })
+    }
+
+    /// Return the symbol table entry or auxiliary record at the given index and offset.
+    pub fn get<T: Pod>(&self, index: usize, offset: usize) -> Result<&'data T> {
+        let bytes = index
+            .checked_add(offset)
+            .and_then(|x| self.symbols.get(x))
+            .read_error("Invalid COFF symbol index")?;
+        Bytes(bytes_of(bytes))
+            .read()
+            .read_error("Invalid COFF symbol data")
+    }
+
+    /// Construct a map from addresses to a user-defined map entry.
+    pub fn map<Entry: SymbolMapEntry, F: Fn(&'data Coff::ImageSymbol) -> Option<Entry>>(
+        &self,
+        f: F,
+    ) -> SymbolMap<Entry> {
+        let mut symbols = Vec::with_capacity(self.symbols.len());
+        for (_, symbol) in self.iter() {
+            if !symbol.is_definition() {
+                continue;
+            }
+            if let Some(entry) = f(symbol) {
+                symbols.push(entry);
+            }
+        }
+        SymbolMap::new(symbols)
+    }
+}
+
+/// An iterator for symbol entries in a COFF or PE file.
+///
+/// Yields the index and symbol structure for each symbol.
+#[derive(Debug)]
+pub struct SymbolIterator<'data, 'table, R = &'data [u8], Coff = pe::ImageFileHeader>
+where
+    R: ReadRef<'data>,
+    Coff: CoffHeader,
+{
+    symbols: &'table SymbolTable<'data, R, Coff>,
+    index: usize,
+}
+
+impl<'data, 'table, R: ReadRef<'data>, Coff: CoffHeader> Iterator
+    for SymbolIterator<'data, 'table, R, Coff>
+{
+    type Item = (usize, &'data Coff::ImageSymbol);
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let index = self.index;
+        let symbol = self.symbols.symbol(index).ok()?;
+        self.index += 1 + symbol.number_of_aux_symbols() as usize;
+        Some((index, symbol))
+    }
+}
+
+/// A symbol table in a [`CoffBigFile`](super::CoffBigFile).
+pub type CoffBigSymbolTable<'data, 'file, R = &'data [u8]> =
+    CoffSymbolTable<'data, 'file, R, pe::AnonObjectHeaderBigobj>;
+
+/// A symbol table in a [`CoffFile`](super::CoffFile)
+/// or [`PeFile`](crate::read::pe::PeFile).
+#[derive(Debug, Clone, Copy)]
+pub struct CoffSymbolTable<'data, 'file, R = &'data [u8], Coff = pe::ImageFileHeader>
+where
+    R: ReadRef<'data>,
+    Coff: CoffHeader,
+{
+    pub(crate) file: &'file CoffCommon<'data, R, Coff>,
+}
+
+impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> read::private::Sealed
+    for CoffSymbolTable<'data, 'file, R, Coff>
+{
+}
+
+impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> ObjectSymbolTable<'data>
+    for CoffSymbolTable<'data, 'file, R, Coff>
+{
+    type Symbol = CoffSymbol<'data, 'file, R, Coff>;
+    type SymbolIterator = CoffSymbolIterator<'data, 'file, R, Coff>;
+
+    fn symbols(&self) -> Self::SymbolIterator {
+        CoffSymbolIterator {
+            file: self.file,
+            index: 0,
+        }
+    }
+
+    fn symbol_by_index(&self, index: SymbolIndex) -> Result<Self::Symbol> {
+        let symbol = self.file.symbols.symbol(index.0)?;
+        Ok(CoffSymbol {
+            file: self.file,
+            index,
+            symbol,
+        })
+    }
+}
+
+/// An iterator for the symbols in a [`CoffBigFile`](super::CoffBigFile).
+pub type CoffBigSymbolIterator<'data, 'file, R = &'data [u8]> =
+    CoffSymbolIterator<'data, 'file, R, pe::AnonObjectHeaderBigobj>;
+
+/// An iterator for the symbols in a [`CoffFile`](super::CoffFile)
+/// or [`PeFile`](crate::read::pe::PeFile).
+pub struct CoffSymbolIterator<'data, 'file, R = &'data [u8], Coff = pe::ImageFileHeader>
+where
+    R: ReadRef<'data>,
+    Coff: CoffHeader,
+{
+    pub(crate) file: &'file CoffCommon<'data, R, Coff>,
+    pub(crate) index: usize,
+}
+
+impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> fmt::Debug
+    for CoffSymbolIterator<'data, 'file, R, Coff>
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("CoffSymbolIterator").finish()
+    }
+}
+
+impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> Iterator
+    for CoffSymbolIterator<'data, 'file, R, Coff>
+{
+    type Item = CoffSymbol<'data, 'file, R, Coff>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let index = self.index;
+        let symbol = self.file.symbols.symbol(index).ok()?;
+        self.index += 1 + symbol.number_of_aux_symbols() as usize;
+        Some(CoffSymbol {
+            file: self.file,
+            index: SymbolIndex(index),
+            symbol,
+        })
+    }
+}
+
+/// A symbol in a [`CoffBigFile`](super::CoffBigFile).
+///
+/// Most functionality is provided by the [`ObjectSymbol`] trait implementation.
+pub type CoffBigSymbol<'data, 'file, R = &'data [u8]> =
+    CoffSymbol<'data, 'file, R, pe::AnonObjectHeaderBigobj>;
+
+/// A symbol in a [`CoffFile`](super::CoffFile) or [`PeFile`](crate::read::pe::PeFile).
+///
+/// Most functionality is provided by the [`ObjectSymbol`] trait implementation.
+#[derive(Debug, Clone, Copy)]
+pub struct CoffSymbol<'data, 'file, R = &'data [u8], Coff = pe::ImageFileHeader>
+where
+    R: ReadRef<'data>,
+    Coff: CoffHeader,
+{
+    pub(crate) file: &'file CoffCommon<'data, R, Coff>,
+    pub(crate) index: SymbolIndex,
+    pub(crate) symbol: &'data Coff::ImageSymbol,
+}
+
+impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> CoffSymbol<'data, 'file, R, Coff> {
+    #[inline]
+    /// Get the raw `ImageSymbol` struct.
+    pub fn raw_symbol(&self) -> &'data Coff::ImageSymbol {
+        self.symbol
+    }
+}
+
+impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> read::private::Sealed
+    for CoffSymbol<'data, 'file, R, Coff>
+{
+}
+
+impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> ObjectSymbol<'data>
+    for CoffSymbol<'data, 'file, R, Coff>
+{
+    #[inline]
+    fn index(&self) -> SymbolIndex {
+        self.index
+    }
+
+    fn name_bytes(&self) -> read::Result<&'data [u8]> {
+        if self.symbol.has_aux_file_name() {
+            self.file
+                .symbols
+                .aux_file_name(self.index.0, self.symbol.number_of_aux_symbols())
+        } else {
+            self.symbol.name(self.file.symbols.strings())
+        }
+    }
+
+    fn name(&self) -> read::Result<&'data str> {
+        let name = self.name_bytes()?;
+        str::from_utf8(name)
+            .ok()
+            .read_error("Non UTF-8 COFF symbol name")
+    }
+
+    fn address(&self) -> u64 {
+        // Only return an address for storage classes that we know use an address.
+        match self.symbol.storage_class() {
+            pe::IMAGE_SYM_CLASS_STATIC
+            | pe::IMAGE_SYM_CLASS_WEAK_EXTERNAL
+            | pe::IMAGE_SYM_CLASS_LABEL => {}
+            pe::IMAGE_SYM_CLASS_EXTERNAL => {
+                if self.symbol.section_number() == pe::IMAGE_SYM_UNDEFINED {
+                    // Undefined or common data, neither of which have an address.
+                    return 0;
+                }
+            }
+            _ => return 0,
+        }
+        self.symbol
+            .address(self.file.image_base, &self.file.sections)
+            .unwrap_or(0)
+    }
+
+    fn size(&self) -> u64 {
+        match self.symbol.storage_class() {
+            pe::IMAGE_SYM_CLASS_STATIC => {
+                // Section symbols may duplicate the size from the section table.
+                if self.symbol.has_aux_section() {
+                    if let Ok(aux) = self.file.symbols.aux_section(self.index.0) {
+                        u64::from(aux.length.get(LE))
+                    } else {
+                        0
+                    }
+                } else {
+                    0
+                }
+            }
+            pe::IMAGE_SYM_CLASS_EXTERNAL => {
+                if self.symbol.section_number() == pe::IMAGE_SYM_UNDEFINED {
+                    // For undefined symbols, symbol.value is 0 and the size is 0.
+                    // For common data, symbol.value is the size.
+                    u64::from(self.symbol.value())
+                } else if self.symbol.has_aux_function() {
+                    // Function symbols may have a size.
+                    if let Ok(aux) = self.file.symbols.aux_function(self.index.0) {
+                        u64::from(aux.total_size.get(LE))
+                    } else {
+                        0
+                    }
+                } else {
+                    0
+                }
+            }
+            // Most symbols don't have sizes.
+            _ => 0,
+        }
+    }
+
+    fn kind(&self) -> SymbolKind {
+        let derived_kind = if self.symbol.derived_type() == pe::IMAGE_SYM_DTYPE_FUNCTION {
+            SymbolKind::Text
+        } else {
+            SymbolKind::Data
+        };
+        match self.symbol.storage_class() {
+            pe::IMAGE_SYM_CLASS_STATIC => {
+                if self.symbol.has_aux_section() {
+                    SymbolKind::Section
+                } else {
+                    derived_kind
+                }
+            }
+            pe::IMAGE_SYM_CLASS_EXTERNAL | pe::IMAGE_SYM_CLASS_WEAK_EXTERNAL => derived_kind,
+            pe::IMAGE_SYM_CLASS_SECTION => SymbolKind::Section,
+            pe::IMAGE_SYM_CLASS_FILE => SymbolKind::File,
+            pe::IMAGE_SYM_CLASS_LABEL => SymbolKind::Label,
+            _ => SymbolKind::Unknown,
+        }
+    }
+
+    fn section(&self) -> SymbolSection {
+        match self.symbol.section_number() {
+            pe::IMAGE_SYM_UNDEFINED => {
+                if self.symbol.storage_class() == pe::IMAGE_SYM_CLASS_EXTERNAL {
+                    if self.symbol.value() == 0 {
+                        SymbolSection::Undefined
+                    } else {
+                        SymbolSection::Common
+                    }
+                } else if self.symbol.storage_class() == pe::IMAGE_SYM_CLASS_SECTION {
+                    SymbolSection::Undefined
+                } else {
+                    SymbolSection::Unknown
+                }
+            }
+            pe::IMAGE_SYM_ABSOLUTE => SymbolSection::Absolute,
+            pe::IMAGE_SYM_DEBUG => {
+                if self.symbol.storage_class() == pe::IMAGE_SYM_CLASS_FILE {
+                    SymbolSection::None
+                } else {
+                    SymbolSection::Unknown
+                }
+            }
+            index if index > 0 => SymbolSection::Section(SectionIndex(index as usize)),
+            _ => SymbolSection::Unknown,
+        }
+    }
+
+    #[inline]
+    fn is_undefined(&self) -> bool {
+        self.symbol.storage_class() == pe::IMAGE_SYM_CLASS_EXTERNAL
+            && self.symbol.section_number() == pe::IMAGE_SYM_UNDEFINED
+            && self.symbol.value() == 0
+    }
+
+    #[inline]
+    fn is_definition(&self) -> bool {
+        self.symbol.is_definition()
+    }
+
+    #[inline]
+    fn is_common(&self) -> bool {
+        self.symbol.storage_class() == pe::IMAGE_SYM_CLASS_EXTERNAL
+            && self.symbol.section_number() == pe::IMAGE_SYM_UNDEFINED
+            && self.symbol.value() != 0
+    }
+
+    #[inline]
+    fn is_weak(&self) -> bool {
+        self.symbol.storage_class() == pe::IMAGE_SYM_CLASS_WEAK_EXTERNAL
+    }
+
+    #[inline]
+    fn scope(&self) -> SymbolScope {
+        match self.symbol.storage_class() {
+            pe::IMAGE_SYM_CLASS_EXTERNAL | pe::IMAGE_SYM_CLASS_WEAK_EXTERNAL => {
+                // TODO: determine if symbol is exported
+                SymbolScope::Linkage
+            }
+            _ => SymbolScope::Compilation,
+        }
+    }
+
+    #[inline]
+    fn is_global(&self) -> bool {
+        match self.symbol.storage_class() {
+            pe::IMAGE_SYM_CLASS_EXTERNAL | pe::IMAGE_SYM_CLASS_WEAK_EXTERNAL => true,
+            _ => false,
+        }
+    }
+
+    #[inline]
+    fn is_local(&self) -> bool {
+        !self.is_global()
+    }
+
+    fn flags(&self) -> SymbolFlags<SectionIndex, SymbolIndex> {
+        if self.symbol.has_aux_section() {
+            if let Ok(aux) = self.file.symbols.aux_section(self.index.0) {
+                let number = if Coff::is_type_bigobj() {
+                    u32::from(aux.number.get(LE)) | (u32::from(aux.high_number.get(LE)) << 16)
+                } else {
+                    u32::from(aux.number.get(LE))
+                };
+                return SymbolFlags::CoffSection {
+                    selection: aux.selection,
+                    associative_section: if number == 0 {
+                        None
+                    } else {
+                        Some(SectionIndex(number as usize))
+                    },
+                };
+            }
+        }
+        SymbolFlags::None
+    }
+}
+
+/// A trait for generic access to [`pe::ImageSymbol`] and [`pe::ImageSymbolEx`].
+#[allow(missing_docs)]
+pub trait ImageSymbol: Debug + Pod {
+    fn raw_name(&self) -> &[u8; 8];
+    fn value(&self) -> u32;
+    fn section_number(&self) -> i32;
+    fn typ(&self) -> u16;
+    fn storage_class(&self) -> u8;
+    fn number_of_aux_symbols(&self) -> u8;
+
+    /// Parse a COFF symbol name.
+    ///
+    /// `strings` must be the string table used for symbol names.
+    fn name<'data, R: ReadRef<'data>>(
+        &'data self,
+        strings: StringTable<'data, R>,
+    ) -> Result<&'data [u8]> {
+        let name = self.raw_name();
+        if name[0] == 0 {
+            // If the name starts with 0 then the last 4 bytes are a string table offset.
+            let offset = u32::from_le_bytes(name[4..8].try_into().unwrap());
+            strings
+                .get(offset)
+                .read_error("Invalid COFF symbol name offset")
+        } else {
+            // The name is inline and padded with nulls.
+            Ok(match memchr::memchr(b'\0', name) {
+                Some(end) => &name[..end],
+                None => &name[..],
+            })
+        }
+    }
+
+    /// Return the symbol address.
+    ///
+    /// This takes into account the image base and the section address.
+    fn address(&self, image_base: u64, sections: &SectionTable<'_>) -> Result<u64> {
+        let section_number = self.section_number() as usize;
+        let section = sections.section(section_number)?;
+        let virtual_address = u64::from(section.virtual_address.get(LE));
+        let value = u64::from(self.value());
+        Ok(image_base + virtual_address + value)
+    }
+
+    /// Return true if the symbol is a definition of a function or data object.
+    fn is_definition(&self) -> bool {
+        if self.section_number() <= 0 {
+            return false;
+        }
+        match self.storage_class() {
+            pe::IMAGE_SYM_CLASS_STATIC => !self.has_aux_section(),
+            pe::IMAGE_SYM_CLASS_EXTERNAL | pe::IMAGE_SYM_CLASS_WEAK_EXTERNAL => true,
+            _ => false,
+        }
+    }
+
+    /// Return true if the symbol has an auxiliary file name.
+    fn has_aux_file_name(&self) -> bool {
+        self.number_of_aux_symbols() > 0 && self.storage_class() == pe::IMAGE_SYM_CLASS_FILE
+    }
+
+    /// Return true if the symbol has an auxiliary function symbol.
+    fn has_aux_function(&self) -> bool {
+        self.number_of_aux_symbols() > 0 && self.derived_type() == pe::IMAGE_SYM_DTYPE_FUNCTION
+    }
+
+    /// Return true if the symbol has an auxiliary section symbol.
+    fn has_aux_section(&self) -> bool {
+        self.number_of_aux_symbols() > 0
+            && self.storage_class() == pe::IMAGE_SYM_CLASS_STATIC
+            && self.typ() == 0
+    }
+
+    fn base_type(&self) -> u16 {
+        self.typ() & pe::N_BTMASK
+    }
+
+    fn derived_type(&self) -> u16 {
+        (self.typ() & pe::N_TMASK) >> pe::N_BTSHFT
+    }
+}
+
+impl ImageSymbol for pe::ImageSymbol {
+    fn raw_name(&self) -> &[u8; 8] {
+        &self.name
+    }
+    fn value(&self) -> u32 {
+        self.value.get(LE)
+    }
+    fn section_number(&self) -> i32 {
+        let section_number = self.section_number.get(LE);
+        if section_number >= pe::IMAGE_SYM_SECTION_MAX {
+            (section_number as i16) as i32
+        } else {
+            section_number as i32
+        }
+    }
+    fn typ(&self) -> u16 {
+        self.typ.get(LE)
+    }
+    fn storage_class(&self) -> u8 {
+        self.storage_class
+    }
+    fn number_of_aux_symbols(&self) -> u8 {
+        self.number_of_aux_symbols
+    }
+}
+
+impl ImageSymbol for pe::ImageSymbolEx {
+    fn raw_name(&self) -> &[u8; 8] {
+        &self.name
+    }
+    fn value(&self) -> u32 {
+        self.value.get(LE)
+    }
+    fn section_number(&self) -> i32 {
+        self.section_number.get(LE)
+    }
+    fn typ(&self) -> u16 {
+        self.typ.get(LE)
+    }
+    fn storage_class(&self) -> u8 {
+        self.storage_class
+    }
+    fn number_of_aux_symbols(&self) -> u8 {
+        self.number_of_aux_symbols
+    }
+}

vendor/object/src/read/elf/attributes.rs

@@ -0,0 +1,307 @@
+use core::convert::TryInto;
+
+use crate::elf;
+use crate::endian;
+use crate::read::{Bytes, Error, ReadError, Result};
+
+use super::FileHeader;
+
+/// An ELF attributes section.
+///
+/// This may be a GNU attributes section, or an architecture specific attributes section.
+///
+/// An attributes section contains a series of [`AttributesSubsection`].
+///
+/// Returned by [`SectionHeader::attributes`](super::SectionHeader::attributes)
+/// and [`SectionHeader::gnu_attributes`](super::SectionHeader::gnu_attributes).
+#[derive(Debug, Clone)]
+pub struct AttributesSection<'data, Elf: FileHeader> {
+    endian: Elf::Endian,
+    version: u8,
+    data: Bytes<'data>,
+}
+
+impl<'data, Elf: FileHeader> AttributesSection<'data, Elf> {
+    /// Parse an ELF attributes section given the section data.
+    pub fn new(endian: Elf::Endian, data: &'data [u8]) -> Result<Self> {
+        let mut data = Bytes(data);
+
+        // Skip the version field that is one byte long.
+        let version = *data
+            .read::<u8>()
+            .read_error("Invalid ELF attributes section offset or size")?;
+
+        Ok(AttributesSection {
+            endian,
+            version,
+            data,
+        })
+    }
+
+    /// Return the version of the attributes section.
+    pub fn version(&self) -> u8 {
+        self.version
+    }
+
+    /// Return an iterator over the subsections.
+    pub fn subsections(&self) -> Result<AttributesSubsectionIterator<'data, Elf>> {
+        // There is currently only one format version.
+        if self.version != b'A' {
+            return Err(Error("Unsupported ELF attributes section version"));
+        }
+
+        Ok(AttributesSubsectionIterator {
+            endian: self.endian,
+            data: self.data,
+        })
+    }
+}
+
+/// An iterator for the subsections in an [`AttributesSection`].
+#[derive(Debug, Clone)]
+pub struct AttributesSubsectionIterator<'data, Elf: FileHeader> {
+    endian: Elf::Endian,
+    data: Bytes<'data>,
+}
+
+impl<'data, Elf: FileHeader> AttributesSubsectionIterator<'data, Elf> {
+    /// Return the next subsection.
+    pub fn next(&mut self) -> Result<Option<AttributesSubsection<'data, Elf>>> {
+        if self.data.is_empty() {
+            return Ok(None);
+        }
+
+        let result = self.parse();
+        if result.is_err() {
+            self.data = Bytes(&[]);
+        }
+        result
+    }
+
+    fn parse(&mut self) -> Result<Option<AttributesSubsection<'data, Elf>>> {
+        // First read the subsection length.
+        let mut data = self.data;
+        let length = data
+            .read::<endian::U32Bytes<Elf::Endian>>()
+            .read_error("ELF attributes section is too short")?
+            .get(self.endian);
+
+        // Now read the entire subsection, updating self.data.
+        let mut data = self
+            .data
+            .read_bytes(length as usize)
+            .read_error("Invalid ELF attributes subsection length")?;
+        // Skip the subsection length field.
+        data.skip(4)
+            .read_error("Invalid ELF attributes subsection length")?;
+
+        let vendor = data
+            .read_string()
+            .read_error("Invalid ELF attributes vendor")?;
+
+        Ok(Some(AttributesSubsection {
+            endian: self.endian,
+            length,
+            vendor,
+            data,
+        }))
+    }
+}
+
+/// A subsection in an [`AttributesSection`].
+///
+/// A subsection is identified by a vendor name.  It contains a series of
+/// [`AttributesSubsubsection`].
+#[derive(Debug, Clone)]
+pub struct AttributesSubsection<'data, Elf: FileHeader> {
+    endian: Elf::Endian,
+    length: u32,
+    vendor: &'data [u8],
+    data: Bytes<'data>,
+}
+
+impl<'data, Elf: FileHeader> AttributesSubsection<'data, Elf> {
+    /// Return the length of the attributes subsection.
+    pub fn length(&self) -> u32 {
+        self.length
+    }
+
+    /// Return the vendor name of the attributes subsection.
+    pub fn vendor(&self) -> &'data [u8] {
+        self.vendor
+    }
+
+    /// Return an iterator over the sub-subsections.
+    pub fn subsubsections(&self) -> AttributesSubsubsectionIterator<'data, Elf> {
+        AttributesSubsubsectionIterator {
+            endian: self.endian,
+            data: self.data,
+        }
+    }
+}
+
+/// An iterator for the sub-subsections in an [`AttributesSubsection`].
+#[derive(Debug, Clone)]
+pub struct AttributesSubsubsectionIterator<'data, Elf: FileHeader> {
+    endian: Elf::Endian,
+    data: Bytes<'data>,
+}
+
+impl<'data, Elf: FileHeader> AttributesSubsubsectionIterator<'data, Elf> {
+    /// Return the next sub-subsection.
+    pub fn next(&mut self) -> Result<Option<AttributesSubsubsection<'data>>> {
+        if self.data.is_empty() {
+            return Ok(None);
+        }
+
+        let result = self.parse();
+        if result.is_err() {
+            self.data = Bytes(&[]);
+        }
+        result
+    }
+
+    fn parse(&mut self) -> Result<Option<AttributesSubsubsection<'data>>> {
+        // The format of a sub-section looks like this:
+        //
+        // <file-tag> <size> <attribute>*
+        // | <section-tag> <size> <section-number>* 0 <attribute>*
+        // | <symbol-tag> <size> <symbol-number>* 0 <attribute>*
+        let mut data = self.data;
+        let tag = *data
+            .read::<u8>()
+            .read_error("ELF attributes subsection is too short")?;
+        let length = data
+            .read::<endian::U32Bytes<Elf::Endian>>()
+            .read_error("ELF attributes subsection is too short")?
+            .get(self.endian);
+
+        // Now read the entire sub-subsection, updating self.data.
+        let mut data = self
+            .data
+            .read_bytes(length as usize)
+            .read_error("Invalid ELF attributes sub-subsection length")?;
+        // Skip the tag and sub-subsection size field.
+        data.skip(1 + 4)
+            .read_error("Invalid ELF attributes sub-subsection length")?;
+
+        let indices = if tag == elf::Tag_Section || tag == elf::Tag_Symbol {
+            data.read_string()
+                .map(Bytes)
+                .read_error("Missing ELF attributes sub-subsection indices")?
+        } else if tag == elf::Tag_File {
+            Bytes(&[])
+        } else {
+            return Err(Error("Unimplemented ELF attributes sub-subsection tag"));
+        };
+
+        Ok(Some(AttributesSubsubsection {
+            tag,
+            length,
+            indices,
+            data,
+        }))
+    }
+}
+
+/// A sub-subsection in an [`AttributesSubsection`].
+///
+/// A sub-subsection is identified by a tag.  It contains an optional series of indices,
+/// followed by a series of attributes.
+#[derive(Debug, Clone)]
+pub struct AttributesSubsubsection<'data> {
+    tag: u8,
+    length: u32,
+    indices: Bytes<'data>,
+    data: Bytes<'data>,
+}
+
+impl<'data> AttributesSubsubsection<'data> {
+    /// Return the tag of the attributes sub-subsection.
+    pub fn tag(&self) -> u8 {
+        self.tag
+    }
+
+    /// Return the length of the attributes sub-subsection.
+    pub fn length(&self) -> u32 {
+        self.length
+    }
+
+    /// Return the data containing the indices.
+    pub fn indices_data(&self) -> &'data [u8] {
+        self.indices.0
+    }
+
+    /// Return the indices.
+    ///
+    /// This will be section indices if the tag is `Tag_Section`,
+    /// or symbol indices if the tag is `Tag_Symbol`,
+    /// and otherwise it will be empty.
+    pub fn indices(&self) -> AttributeIndexIterator<'data> {
+        AttributeIndexIterator { data: self.indices }
+    }
+
+    /// Return the data containing the attributes.
+    pub fn attributes_data(&self) -> &'data [u8] {
+        self.data.0
+    }
+
+    /// Return a parser for the data containing the attributes.
+    pub fn attributes(&self) -> AttributeReader<'data> {
+        AttributeReader { data: self.data }
+    }
+}
+
+/// An iterator over the indices in an [`AttributesSubsubsection`].
+#[derive(Debug, Clone)]
+pub struct AttributeIndexIterator<'data> {
+    data: Bytes<'data>,
+}
+
+impl<'data> AttributeIndexIterator<'data> {
+    /// Parse the next index.
+    pub fn next(&mut self) -> Result<Option<u32>> {
+        if self.data.is_empty() {
+            return Ok(None);
+        }
+        let err = "Invalid ELF attribute index";
+        self.data
+            .read_uleb128()
+            .read_error(err)?
+            .try_into()
+            .map_err(|_| ())
+            .read_error(err)
+            .map(Some)
+    }
+}
+
+/// A parser for the attributes in an [`AttributesSubsubsection`].
+///
+/// The parser relies on the caller to know the format of the data for each attribute tag.
+#[derive(Debug, Clone)]
+pub struct AttributeReader<'data> {
+    data: Bytes<'data>,
+}
+
+impl<'data> AttributeReader<'data> {
+    /// Parse a tag.
+    pub fn read_tag(&mut self) -> Result<Option<u64>> {
+        if self.data.is_empty() {
+            return Ok(None);
+        }
+        let err = "Invalid ELF attribute tag";
+        self.data.read_uleb128().read_error(err).map(Some)
+    }
+
+    /// Parse an integer value.
+    pub fn read_integer(&mut self) -> Result<u64> {
+        let err = "Invalid ELF attribute integer value";
+        self.data.read_uleb128().read_error(err)
+    }
+
+    /// Parse a string value.
+    pub fn read_string(&mut self) -> Result<&'data [u8]> {
+        let err = "Invalid ELF attribute string value";
+        self.data.read_string().read_error(err)
+    }
+}

vendor/object/src/read/elf/comdat.rs

@@ -0,0 +1,162 @@
+use core::fmt::Debug;
+use core::{iter, slice, str};
+
+use crate::elf;
+use crate::endian::{Endianness, U32Bytes};
+use crate::read::{self, ComdatKind, ObjectComdat, ReadError, ReadRef, SectionIndex, SymbolIndex};
+
+use super::{ElfFile, FileHeader, SectionHeader, Sym};
+
+/// An iterator for the COMDAT section groups in an [`ElfFile32`](super::ElfFile32).
+pub type ElfComdatIterator32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    ElfComdatIterator<'data, 'file, elf::FileHeader32<Endian>, R>;
+/// An iterator for the COMDAT section groups in an [`ElfFile64`](super::ElfFile64).
+pub type ElfComdatIterator64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    ElfComdatIterator<'data, 'file, elf::FileHeader64<Endian>, R>;
+
+/// An iterator for the COMDAT section groups in an [`ElfFile`].
+#[derive(Debug)]
+pub struct ElfComdatIterator<'data, 'file, Elf, R = &'data [u8]>
+where
+    Elf: FileHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) file: &'file ElfFile<'data, Elf, R>,
+    pub(super) iter: iter::Enumerate<slice::Iter<'data, Elf::SectionHeader>>,
+}
+
+impl<'data, 'file, Elf, R> Iterator for ElfComdatIterator<'data, 'file, Elf, R>
+where
+    Elf: FileHeader,
+    R: ReadRef<'data>,
+{
+    type Item = ElfComdat<'data, 'file, Elf, R>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        for (_index, section) in self.iter.by_ref() {
+            if let Some(comdat) = ElfComdat::parse(self.file, section) {
+                return Some(comdat);
+            }
+        }
+        None
+    }
+}
+
+/// A COMDAT section group in an [`ElfFile32`](super::ElfFile32).
+pub type ElfComdat32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    ElfComdat<'data, 'file, elf::FileHeader32<Endian>, R>;
+/// A COMDAT section group in an [`ElfFile64`](super::ElfFile64).
+pub type ElfComdat64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    ElfComdat<'data, 'file, elf::FileHeader64<Endian>, R>;
+
+/// A COMDAT section group in an [`ElfFile`].
+///
+/// Most functionality is provided by the [`ObjectComdat`] trait implementation.
+#[derive(Debug)]
+pub struct ElfComdat<'data, 'file, Elf, R = &'data [u8]>
+where
+    Elf: FileHeader,
+    R: ReadRef<'data>,
+{
+    file: &'file ElfFile<'data, Elf, R>,
+    section: &'data Elf::SectionHeader,
+    sections: &'data [U32Bytes<Elf::Endian>],
+}
+
+impl<'data, 'file, Elf, R> ElfComdat<'data, 'file, Elf, R>
+where
+    Elf: FileHeader,
+    R: ReadRef<'data>,
+{
+    fn parse(
+        file: &'file ElfFile<'data, Elf, R>,
+        section: &'data Elf::SectionHeader,
+    ) -> Option<ElfComdat<'data, 'file, Elf, R>> {
+        let (flag, sections) = section.group(file.endian, file.data).ok()??;
+        if flag != elf::GRP_COMDAT {
+            return None;
+        }
+        Some(ElfComdat {
+            file,
+            section,
+            sections,
+        })
+    }
+}
+
+impl<'data, 'file, Elf, R> read::private::Sealed for ElfComdat<'data, 'file, Elf, R>
+where
+    Elf: FileHeader,
+    R: ReadRef<'data>,
+{
+}
+
+impl<'data, 'file, Elf, R> ObjectComdat<'data> for ElfComdat<'data, 'file, Elf, R>
+where
+    Elf: FileHeader,
+    R: ReadRef<'data>,
+{
+    type SectionIterator = ElfComdatSectionIterator<'data, 'file, Elf, R>;
+
+    #[inline]
+    fn kind(&self) -> ComdatKind {
+        ComdatKind::Any
+    }
+
+    #[inline]
+    fn symbol(&self) -> SymbolIndex {
+        SymbolIndex(self.section.sh_info(self.file.endian) as usize)
+    }
+
+    fn name_bytes(&self) -> read::Result<&[u8]> {
+        // FIXME: check sh_link
+        let index = self.section.sh_info(self.file.endian) as usize;
+        let symbol = self.file.symbols.symbol(index)?;
+        symbol.name(self.file.endian, self.file.symbols.strings())
+    }
+
+    fn name(&self) -> read::Result<&str> {
+        let name = self.name_bytes()?;
+        str::from_utf8(name)
+            .ok()
+            .read_error("Non UTF-8 ELF COMDAT name")
+    }
+
+    fn sections(&self) -> Self::SectionIterator {
+        ElfComdatSectionIterator {
+            file: self.file,
+            sections: self.sections.iter(),
+        }
+    }
+}
+
+/// An iterator for the sections in a COMDAT section group in an [`ElfFile32`](super::ElfFile32).
+pub type ElfComdatSectionIterator32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    ElfComdatSectionIterator<'data, 'file, elf::FileHeader32<Endian>, R>;
+/// An iterator for the sections in a COMDAT section group in an [`ElfFile64`](super::ElfFile64).
+pub type ElfComdatSectionIterator64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    ElfComdatSectionIterator<'data, 'file, elf::FileHeader64<Endian>, R>;
+
+/// An iterator for the sections in a COMDAT section group in an [`ElfFile`].
+#[derive(Debug)]
+pub struct ElfComdatSectionIterator<'data, 'file, Elf, R = &'data [u8]>
+where
+    Elf: FileHeader,
+    R: ReadRef<'data>,
+{
+    file: &'file ElfFile<'data, Elf, R>,
+    sections: slice::Iter<'data, U32Bytes<Elf::Endian>>,
+}
+
+impl<'data, 'file, Elf, R> Iterator for ElfComdatSectionIterator<'data, 'file, Elf, R>
+where
+    Elf: FileHeader,
+    R: ReadRef<'data>,
+{
+    type Item = SectionIndex;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let index = self.sections.next()?;
+        Some(SectionIndex(index.get(self.file.endian) as usize))
+    }
+}

vendor/object/src/read/elf/compression.rs

@@ -0,0 +1,56 @@
+use core::fmt::Debug;
+
+use crate::elf;
+use crate::endian;
+use crate::pod::Pod;
+
+/// A trait for generic access to [`elf::CompressionHeader32`] and [`elf::CompressionHeader64`].
+#[allow(missing_docs)]
+pub trait CompressionHeader: Debug + Pod {
+    type Word: Into<u64>;
+    type Endian: endian::Endian;
+
+    fn ch_type(&self, endian: Self::Endian) -> u32;
+    fn ch_size(&self, endian: Self::Endian) -> Self::Word;
+    fn ch_addralign(&self, endian: Self::Endian) -> Self::Word;
+}
+
+impl<Endian: endian::Endian> CompressionHeader for elf::CompressionHeader32<Endian> {
+    type Word = u32;
+    type Endian = Endian;
+
+    #[inline]
+    fn ch_type(&self, endian: Self::Endian) -> u32 {
+        self.ch_type.get(endian)
+    }
+
+    #[inline]
+    fn ch_size(&self, endian: Self::Endian) -> Self::Word {
+        self.ch_size.get(endian)
+    }
+
+    #[inline]
+    fn ch_addralign(&self, endian: Self::Endian) -> Self::Word {
+        self.ch_addralign.get(endian)
+    }
+}
+
+impl<Endian: endian::Endian> CompressionHeader for elf::CompressionHeader64<Endian> {
+    type Word = u64;
+    type Endian = Endian;
+
+    #[inline]
+    fn ch_type(&self, endian: Self::Endian) -> u32 {
+        self.ch_type.get(endian)
+    }
+
+    #[inline]
+    fn ch_size(&self, endian: Self::Endian) -> Self::Word {
+        self.ch_size.get(endian)
+    }
+
+    #[inline]
+    fn ch_addralign(&self, endian: Self::Endian) -> Self::Word {
+        self.ch_addralign.get(endian)
+    }
+}

vendor/object/src/read/elf/dynamic.rs

@@ -0,0 +1,117 @@
+use core::convert::TryInto;
+use core::fmt::Debug;
+
+use crate::elf;
+use crate::endian;
+use crate::pod::Pod;
+use crate::read::{ReadError, Result, StringTable};
+
+/// A trait for generic access to [`elf::Dyn32`] and [`elf::Dyn64`].
+#[allow(missing_docs)]
+pub trait Dyn: Debug + Pod {
+    type Word: Into<u64>;
+    type Endian: endian::Endian;
+
+    fn d_tag(&self, endian: Self::Endian) -> Self::Word;
+    fn d_val(&self, endian: Self::Endian) -> Self::Word;
+
+    /// Try to convert the tag to a `u32`.
+    fn tag32(&self, endian: Self::Endian) -> Option<u32> {
+        self.d_tag(endian).into().try_into().ok()
+    }
+
+    /// Try to convert the value to a `u32`.
+    fn val32(&self, endian: Self::Endian) -> Option<u32> {
+        self.d_val(endian).into().try_into().ok()
+    }
+
+    /// Return true if the value is an offset in the dynamic string table.
+    fn is_string(&self, endian: Self::Endian) -> bool {
+        if let Some(tag) = self.tag32(endian) {
+            match tag {
+                elf::DT_NEEDED
+                | elf::DT_SONAME
+                | elf::DT_RPATH
+                | elf::DT_RUNPATH
+                | elf::DT_AUXILIARY
+                | elf::DT_FILTER => true,
+                _ => false,
+            }
+        } else {
+            false
+        }
+    }
+
+    /// Use the value to get a string in a string table.
+    ///
+    /// Does not check for an appropriate tag.
+    fn string<'data>(
+        &self,
+        endian: Self::Endian,
+        strings: StringTable<'data>,
+    ) -> Result<&'data [u8]> {
+        self.val32(endian)
+            .and_then(|val| strings.get(val).ok())
+            .read_error("Invalid ELF dyn string")
+    }
+
+    /// Return true if the value is an address.
+    fn is_address(&self, endian: Self::Endian) -> bool {
+        if let Some(tag) = self.tag32(endian) {
+            match tag {
+                elf::DT_PLTGOT
+                | elf::DT_HASH
+                | elf::DT_STRTAB
+                | elf::DT_SYMTAB
+                | elf::DT_RELA
+                | elf::DT_INIT
+                | elf::DT_FINI
+                | elf::DT_SYMBOLIC
+                | elf::DT_REL
+                | elf::DT_DEBUG
+                | elf::DT_JMPREL
+                | elf::DT_FINI_ARRAY
+                | elf::DT_INIT_ARRAY
+                | elf::DT_PREINIT_ARRAY
+                | elf::DT_SYMTAB_SHNDX
+                | elf::DT_VERDEF
+                | elf::DT_VERNEED
+                | elf::DT_VERSYM
+                | elf::DT_ADDRRNGLO..=elf::DT_ADDRRNGHI => true,
+                _ => false,
+            }
+        } else {
+            false
+        }
+    }
+}
+
+impl<Endian: endian::Endian> Dyn for elf::Dyn32<Endian> {
+    type Word = u32;
+    type Endian = Endian;
+
+    #[inline]
+    fn d_tag(&self, endian: Self::Endian) -> Self::Word {
+        self.d_tag.get(endian)
+    }
+
+    #[inline]
+    fn d_val(&self, endian: Self::Endian) -> Self::Word {
+        self.d_val.get(endian)
+    }
+}
+
+impl<Endian: endian::Endian> Dyn for elf::Dyn64<Endian> {
+    type Word = u64;
+    type Endian = Endian;
+
+    #[inline]
+    fn d_tag(&self, endian: Self::Endian) -> Self::Word {
+        self.d_tag.get(endian)
+    }
+
+    #[inline]
+    fn d_val(&self, endian: Self::Endian) -> Self::Word {
+        self.d_val.get(endian)
+    }
+}

vendor/object/src/read/elf/file.rs

@@ -0,0 +1,916 @@
+use alloc::vec::Vec;
+use core::convert::TryInto;
+use core::fmt::Debug;
+use core::mem;
+
+use crate::read::{
+    self, util, Architecture, ByteString, Bytes, Error, Export, FileFlags, Import, Object,
+    ObjectKind, ReadError, ReadRef, SectionIndex, StringTable, SymbolIndex,
+};
+use crate::{elf, endian, Endian, Endianness, Pod, U32};
+
+use super::{
+    CompressionHeader, Dyn, ElfComdat, ElfComdatIterator, ElfDynamicRelocationIterator, ElfSection,
+    ElfSectionIterator, ElfSegment, ElfSegmentIterator, ElfSymbol, ElfSymbolIterator,
+    ElfSymbolTable, NoteHeader, ProgramHeader, Rel, Rela, RelocationSections, SectionHeader,
+    SectionTable, Sym, SymbolTable,
+};
+
+/// A 32-bit ELF object file.
+///
+/// This is a file that starts with [`elf::FileHeader32`], and corresponds
+/// to [`crate::FileKind::Elf32`].
+pub type ElfFile32<'data, Endian = Endianness, R = &'data [u8]> =
+    ElfFile<'data, elf::FileHeader32<Endian>, R>;
+/// A 64-bit ELF object file.
+///
+/// This is a file that starts with [`elf::FileHeader64`], and corresponds
+/// to [`crate::FileKind::Elf64`].
+pub type ElfFile64<'data, Endian = Endianness, R = &'data [u8]> =
+    ElfFile<'data, elf::FileHeader64<Endian>, R>;
+
+/// A partially parsed ELF file.
+///
+/// Most functionality is provided by the [`Object`] trait implementation.
+#[derive(Debug)]
+pub struct ElfFile<'data, Elf, R = &'data [u8]>
+where
+    Elf: FileHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) endian: Elf::Endian,
+    pub(super) data: R,
+    pub(super) header: &'data Elf,
+    pub(super) segments: &'data [Elf::ProgramHeader],
+    pub(super) sections: SectionTable<'data, Elf, R>,
+    pub(super) relocations: RelocationSections,
+    pub(super) symbols: SymbolTable<'data, Elf, R>,
+    pub(super) dynamic_symbols: SymbolTable<'data, Elf, R>,
+}
+
+impl<'data, Elf, R> ElfFile<'data, Elf, R>
+where
+    Elf: FileHeader,
+    R: ReadRef<'data>,
+{
+    /// Parse the raw ELF file data.
+    pub fn parse(data: R) -> read::Result<Self> {
+        let header = Elf::parse(data)?;
+        let endian = header.endian()?;
+        let segments = header.program_headers(endian, data)?;
+        let sections = header.sections(endian, data)?;
+        let symbols = sections.symbols(endian, data, elf::SHT_SYMTAB)?;
+        // TODO: get dynamic symbols from DT_SYMTAB if there are no sections
+        let dynamic_symbols = sections.symbols(endian, data, elf::SHT_DYNSYM)?;
+        // The API we provide requires a mapping from section to relocations, so build it now.
+        let relocations = sections.relocation_sections(endian, symbols.section())?;
+
+        Ok(ElfFile {
+            endian,
+            data,
+            header,
+            segments,
+            sections,
+            relocations,
+            symbols,
+            dynamic_symbols,
+        })
+    }
+
+    /// Returns the endianness.
+    pub fn endian(&self) -> Elf::Endian {
+        self.endian
+    }
+
+    /// Returns the raw data.
+    pub fn data(&self) -> R {
+        self.data
+    }
+
+    /// Returns the raw ELF file header.
+    pub fn raw_header(&self) -> &'data Elf {
+        self.header
+    }
+
+    /// Returns the raw ELF segments.
+    pub fn raw_segments(&self) -> &'data [Elf::ProgramHeader] {
+        self.segments
+    }
+
+    fn raw_section_by_name<'file>(
+        &'file self,
+        section_name: &[u8],
+    ) -> Option<ElfSection<'data, 'file, Elf, R>> {
+        self.sections
+            .section_by_name(self.endian, section_name)
+            .map(|(index, section)| ElfSection {
+                file: self,
+                index: SectionIndex(index),
+                section,
+            })
+    }
+
+    #[cfg(feature = "compression")]
+    fn zdebug_section_by_name<'file>(
+        &'file self,
+        section_name: &[u8],
+    ) -> Option<ElfSection<'data, 'file, Elf, R>> {
+        if !section_name.starts_with(b".debug_") {
+            return None;
+        }
+        let mut name = Vec::with_capacity(section_name.len() + 1);
+        name.extend_from_slice(b".zdebug_");
+        name.extend_from_slice(&section_name[7..]);
+        self.raw_section_by_name(&name)
+    }
+
+    #[cfg(not(feature = "compression"))]
+    fn zdebug_section_by_name<'file>(
+        &'file self,
+        _section_name: &[u8],
+    ) -> Option<ElfSection<'data, 'file, Elf, R>> {
+        None
+    }
+}
+
+impl<'data, Elf, R> read::private::Sealed for ElfFile<'data, Elf, R>
+where
+    Elf: FileHeader,
+    R: ReadRef<'data>,
+{
+}
+
+impl<'data, 'file, Elf, R> Object<'data, 'file> for ElfFile<'data, Elf, R>
+where
+    'data: 'file,
+    Elf: FileHeader,
+    R: 'file + ReadRef<'data>,
+{
+    type Segment = ElfSegment<'data, 'file, Elf, R>;
+    type SegmentIterator = ElfSegmentIterator<'data, 'file, Elf, R>;
+    type Section = ElfSection<'data, 'file, Elf, R>;
+    type SectionIterator = ElfSectionIterator<'data, 'file, Elf, R>;
+    type Comdat = ElfComdat<'data, 'file, Elf, R>;
+    type ComdatIterator = ElfComdatIterator<'data, 'file, Elf, R>;
+    type Symbol = ElfSymbol<'data, 'file, Elf, R>;
+    type SymbolIterator = ElfSymbolIterator<'data, 'file, Elf, R>;
+    type SymbolTable = ElfSymbolTable<'data, 'file, Elf, R>;
+    type DynamicRelocationIterator = ElfDynamicRelocationIterator<'data, 'file, Elf, R>;
+
+    fn architecture(&self) -> Architecture {
+        match (
+            self.header.e_machine(self.endian),
+            self.header.is_class_64(),
+        ) {
+            (elf::EM_AARCH64, true) => Architecture::Aarch64,
+            (elf::EM_AARCH64, false) => Architecture::Aarch64_Ilp32,
+            (elf::EM_ARM, _) => Architecture::Arm,
+            (elf::EM_AVR, _) => Architecture::Avr,
+            (elf::EM_BPF, _) => Architecture::Bpf,
+            (elf::EM_CSKY, _) => Architecture::Csky,
+            (elf::EM_386, _) => Architecture::I386,
+            (elf::EM_X86_64, false) => Architecture::X86_64_X32,
+            (elf::EM_X86_64, true) => Architecture::X86_64,
+            (elf::EM_HEXAGON, _) => Architecture::Hexagon,
+            (elf::EM_LOONGARCH, true) => Architecture::LoongArch64,
+            (elf::EM_MIPS, false) => Architecture::Mips,
+            (elf::EM_MIPS, true) => Architecture::Mips64,
+            (elf::EM_MSP430, _) => Architecture::Msp430,
+            (elf::EM_PPC, _) => Architecture::PowerPc,
+            (elf::EM_PPC64, _) => Architecture::PowerPc64,
+            (elf::EM_RISCV, false) => Architecture::Riscv32,
+            (elf::EM_RISCV, true) => Architecture::Riscv64,
+            // This is either s390 or s390x, depending on the ELF class.
+            // We only support the 64-bit variant s390x here.
+            (elf::EM_S390, true) => Architecture::S390x,
+            (elf::EM_SBF, _) => Architecture::Sbf,
+            (elf::EM_SHARC, false) => Architecture::Sharc,
+            (elf::EM_SPARCV9, true) => Architecture::Sparc64,
+            (elf::EM_XTENSA, false) => Architecture::Xtensa,
+            _ => Architecture::Unknown,
+        }
+    }
+
+    #[inline]
+    fn is_little_endian(&self) -> bool {
+        self.header.is_little_endian()
+    }
+
+    #[inline]
+    fn is_64(&self) -> bool {
+        self.header.is_class_64()
+    }
+
+    fn kind(&self) -> ObjectKind {
+        match self.header.e_type(self.endian) {
+            elf::ET_REL => ObjectKind::Relocatable,
+            elf::ET_EXEC => ObjectKind::Executable,
+            // TODO: check for `DF_1_PIE`?
+            elf::ET_DYN => ObjectKind::Dynamic,
+            elf::ET_CORE => ObjectKind::Core,
+            _ => ObjectKind::Unknown,
+        }
+    }
+
+    fn segments(&'file self) -> ElfSegmentIterator<'data, 'file, Elf, R> {
+        ElfSegmentIterator {
+            file: self,
+            iter: self.segments.iter(),
+        }
+    }
+
+    fn section_by_name_bytes(
+        &'file self,
+        section_name: &[u8],
+    ) -> Option<ElfSection<'data, 'file, Elf, R>> {
+        self.raw_section_by_name(section_name)
+            .or_else(|| self.zdebug_section_by_name(section_name))
+    }
+
+    fn section_by_index(
+        &'file self,
+        index: SectionIndex,
+    ) -> read::Result<ElfSection<'data, 'file, Elf, R>> {
+        let section = self.sections.section(index)?;
+        Ok(ElfSection {
+            file: self,
+            index,
+            section,
+        })
+    }
+
+    fn sections(&'file self) -> ElfSectionIterator<'data, 'file, Elf, R> {
+        ElfSectionIterator {
+            file: self,
+            iter: self.sections.iter().enumerate(),
+        }
+    }
+
+    fn comdats(&'file self) -> ElfComdatIterator<'data, 'file, Elf, R> {
+        ElfComdatIterator {
+            file: self,
+            iter: self.sections.iter().enumerate(),
+        }
+    }
+
+    fn symbol_by_index(
+        &'file self,
+        index: SymbolIndex,
+    ) -> read::Result<ElfSymbol<'data, 'file, Elf, R>> {
+        let symbol = self.symbols.symbol(index.0)?;
+        Ok(ElfSymbol {
+            endian: self.endian,
+            symbols: &self.symbols,
+            index,
+            symbol,
+        })
+    }
+
+    fn symbols(&'file self) -> ElfSymbolIterator<'data, 'file, Elf, R> {
+        ElfSymbolIterator {
+            endian: self.endian,
+            symbols: &self.symbols,
+            index: 0,
+        }
+    }
+
+    fn symbol_table(&'file self) -> Option<ElfSymbolTable<'data, 'file, Elf, R>> {
+        if self.symbols.is_empty() {
+            return None;
+        }
+        Some(ElfSymbolTable {
+            endian: self.endian,
+            symbols: &self.symbols,
+        })
+    }
+
+    fn dynamic_symbols(&'file self) -> ElfSymbolIterator<'data, 'file, Elf, R> {
+        ElfSymbolIterator {
+            endian: self.endian,
+            symbols: &self.dynamic_symbols,
+            index: 0,
+        }
+    }
+
+    fn dynamic_symbol_table(&'file self) -> Option<ElfSymbolTable<'data, 'file, Elf, R>> {
+        if self.dynamic_symbols.is_empty() {
+            return None;
+        }
+        Some(ElfSymbolTable {
+            endian: self.endian,
+            symbols: &self.dynamic_symbols,
+        })
+    }
+
+    fn dynamic_relocations(
+        &'file self,
+    ) -> Option<ElfDynamicRelocationIterator<'data, 'file, Elf, R>> {
+        Some(ElfDynamicRelocationIterator {
+            section_index: SectionIndex(1),
+            file: self,
+            relocations: None,
+        })
+    }
+
+    fn imports(&self) -> read::Result<Vec<Import<'data>>> {
+        let mut imports = Vec::new();
+        for symbol in self.dynamic_symbols.iter() {
+            if symbol.is_undefined(self.endian) {
+                let name = symbol.name(self.endian, self.dynamic_symbols.strings())?;
+                if !name.is_empty() {
+                    // TODO: use symbol versioning to determine library
+                    imports.push(Import {
+                        name: ByteString(name),
+                        library: ByteString(&[]),
+                    });
+                }
+            }
+        }
+        Ok(imports)
+    }
+
+    fn exports(&self) -> read::Result<Vec<Export<'data>>> {
+        let mut exports = Vec::new();
+        for symbol in self.dynamic_symbols.iter() {
+            if symbol.is_definition(self.endian) {
+                let name = symbol.name(self.endian, self.dynamic_symbols.strings())?;
+                let address = symbol.st_value(self.endian).into();
+                exports.push(Export {
+                    name: ByteString(name),
+                    address,
+                });
+            }
+        }
+        Ok(exports)
+    }
+
+    fn has_debug_symbols(&self) -> bool {
+        for section in self.sections.iter() {
+            if let Ok(name) = self.sections.section_name(self.endian, section) {
+                if name == b".debug_info" || name == b".zdebug_info" {
+                    return true;
+                }
+            }
+        }
+        false
+    }
+
+    fn build_id(&self) -> read::Result<Option<&'data [u8]>> {
+        let endian = self.endian;
+        // Use section headers if present, otherwise use program headers.
+        if !self.sections.is_empty() {
+            for section in self.sections.iter() {
+                if let Some(mut notes) = section.notes(endian, self.data)? {
+                    while let Some(note) = notes.next()? {
+                        if note.name() == elf::ELF_NOTE_GNU
+                            && note.n_type(endian) == elf::NT_GNU_BUILD_ID
+                        {
+                            return Ok(Some(note.desc()));
+                        }
+                    }
+                }
+            }
+        } else {
+            for segment in self.segments {
+                if let Some(mut notes) = segment.notes(endian, self.data)? {
+                    while let Some(note) = notes.next()? {
+                        if note.name() == elf::ELF_NOTE_GNU
+                            && note.n_type(endian) == elf::NT_GNU_BUILD_ID
+                        {
+                            return Ok(Some(note.desc()));
+                        }
+                    }
+                }
+            }
+        }
+        Ok(None)
+    }
+
+    fn gnu_debuglink(&self) -> read::Result<Option<(&'data [u8], u32)>> {
+        let section = match self.raw_section_by_name(b".gnu_debuglink") {
+            Some(section) => section,
+            None => return Ok(None),
+        };
+        let data = section
+            .section
+            .data(self.endian, self.data)
+            .read_error("Invalid ELF .gnu_debuglink section offset or size")
+            .map(Bytes)?;
+        let filename = data
+            .read_string_at(0)
+            .read_error("Missing ELF .gnu_debuglink filename")?;
+        let crc_offset = util::align(filename.len() + 1, 4);
+        let crc = data
+            .read_at::<U32<_>>(crc_offset)
+            .read_error("Missing ELF .gnu_debuglink crc")?
+            .get(self.endian);
+        Ok(Some((filename, crc)))
+    }
+
+    fn gnu_debugaltlink(&self) -> read::Result<Option<(&'data [u8], &'data [u8])>> {
+        let section = match self.raw_section_by_name(b".gnu_debugaltlink") {
+            Some(section) => section,
+            None => return Ok(None),
+        };
+        let mut data = section
+            .section
+            .data(self.endian, self.data)
+            .read_error("Invalid ELF .gnu_debugaltlink section offset or size")
+            .map(Bytes)?;
+        let filename = data
+            .read_string()
+            .read_error("Missing ELF .gnu_debugaltlink filename")?;
+        let build_id = data.0;
+        Ok(Some((filename, build_id)))
+    }
+
+    fn relative_address_base(&self) -> u64 {
+        0
+    }
+
+    fn entry(&self) -> u64 {
+        self.header.e_entry(self.endian).into()
+    }
+
+    fn flags(&self) -> FileFlags {
+        FileFlags::Elf {
+            os_abi: self.header.e_ident().os_abi,
+            abi_version: self.header.e_ident().abi_version,
+            e_flags: self.header.e_flags(self.endian),
+        }
+    }
+}
+
+/// A trait for generic access to [`elf::FileHeader32`] and [`elf::FileHeader64`].
+#[allow(missing_docs)]
+pub trait FileHeader: Debug + Pod {
+    // Ideally this would be a `u64: From<Word>`, but can't express that.
+    type Word: Into<u64>;
+    type Sword: Into<i64>;
+    type Endian: endian::Endian;
+    type ProgramHeader: ProgramHeader<Elf = Self, Endian = Self::Endian, Word = Self::Word>;
+    type SectionHeader: SectionHeader<Elf = Self, Endian = Self::Endian, Word = Self::Word>;
+    type CompressionHeader: CompressionHeader<Endian = Self::Endian, Word = Self::Word>;
+    type NoteHeader: NoteHeader<Endian = Self::Endian>;
+    type Dyn: Dyn<Endian = Self::Endian, Word = Self::Word>;
+    type Sym: Sym<Endian = Self::Endian, Word = Self::Word>;
+    type Rel: Rel<Endian = Self::Endian, Word = Self::Word>;
+    type Rela: Rela<Endian = Self::Endian, Word = Self::Word> + From<Self::Rel>;
+
+    /// Return true if this type is a 64-bit header.
+    ///
+    /// This is a property of the type, not a value in the header data.
+    fn is_type_64(&self) -> bool;
+
+    /// Return true if this type is a 64-bit header.
+    ///
+    /// This is a property of the type, not a value in the header data.
+    ///
+    /// This is the same as [`Self::is_type_64`], but is non-dispatchable.
+    fn is_type_64_sized() -> bool
+    where
+        Self: Sized;
+
+    fn e_ident(&self) -> &elf::Ident;
+    fn e_type(&self, endian: Self::Endian) -> u16;
+    fn e_machine(&self, endian: Self::Endian) -> u16;
+    fn e_version(&self, endian: Self::Endian) -> u32;
+    fn e_entry(&self, endian: Self::Endian) -> Self::Word;
+    fn e_phoff(&self, endian: Self::Endian) -> Self::Word;
+    fn e_shoff(&self, endian: Self::Endian) -> Self::Word;
+    fn e_flags(&self, endian: Self::Endian) -> u32;
+    fn e_ehsize(&self, endian: Self::Endian) -> u16;
+    fn e_phentsize(&self, endian: Self::Endian) -> u16;
+    fn e_phnum(&self, endian: Self::Endian) -> u16;
+    fn e_shentsize(&self, endian: Self::Endian) -> u16;
+    fn e_shnum(&self, endian: Self::Endian) -> u16;
+    fn e_shstrndx(&self, endian: Self::Endian) -> u16;
+
+    // Provided methods.
+
+    /// Read the file header.
+    ///
+    /// Also checks that the ident field in the file header is a supported format.
+    fn parse<'data, R: ReadRef<'data>>(data: R) -> read::Result<&'data Self> {
+        let header = data
+            .read_at::<Self>(0)
+            .read_error("Invalid ELF header size or alignment")?;
+        if !header.is_supported() {
+            return Err(Error("Unsupported ELF header"));
+        }
+        // TODO: Check self.e_ehsize?
+        Ok(header)
+    }
+
+    /// Check that the ident field in the file header is a supported format.
+    ///
+    /// This checks the magic number, version, class, and endianness.
+    fn is_supported(&self) -> bool {
+        let ident = self.e_ident();
+        // TODO: Check self.e_version too? Requires endian though.
+        ident.magic == elf::ELFMAG
+            && (self.is_type_64() || self.is_class_32())
+            && (!self.is_type_64() || self.is_class_64())
+            && (self.is_little_endian() || self.is_big_endian())
+            && ident.version == elf::EV_CURRENT
+    }
+
+    fn is_class_32(&self) -> bool {
+        self.e_ident().class == elf::ELFCLASS32
+    }
+
+    fn is_class_64(&self) -> bool {
+        self.e_ident().class == elf::ELFCLASS64
+    }
+
+    fn is_little_endian(&self) -> bool {
+        self.e_ident().data == elf::ELFDATA2LSB
+    }
+
+    fn is_big_endian(&self) -> bool {
+        self.e_ident().data == elf::ELFDATA2MSB
+    }
+
+    fn endian(&self) -> read::Result<Self::Endian> {
+        Self::Endian::from_big_endian(self.is_big_endian()).read_error("Unsupported ELF endian")
+    }
+
+    /// Return the first section header, if present.
+    ///
+    /// Section 0 is a special case because getting the section headers normally
+    /// requires `shnum`, but `shnum` may be in the first section header.
+    fn section_0<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Self::Endian,
+        data: R,
+    ) -> read::Result<Option<&'data Self::SectionHeader>> {
+        let shoff: u64 = self.e_shoff(endian).into();
+        if shoff == 0 {
+            // No section headers is ok.
+            return Ok(None);
+        }
+        let shentsize = usize::from(self.e_shentsize(endian));
+        if shentsize != mem::size_of::<Self::SectionHeader>() {
+            // Section header size must match.
+            return Err(Error("Invalid ELF section header entry size"));
+        }
+        data.read_at(shoff)
+            .map(Some)
+            .read_error("Invalid ELF section header offset or size")
+    }
+
+    /// Return the `e_phnum` field of the header. Handles extended values.
+    ///
+    /// Returns `Err` for invalid values.
+    fn phnum<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Self::Endian,
+        data: R,
+    ) -> read::Result<usize> {
+        let e_phnum = self.e_phnum(endian);
+        if e_phnum < elf::PN_XNUM {
+            Ok(e_phnum as usize)
+        } else if let Some(section_0) = self.section_0(endian, data)? {
+            Ok(section_0.sh_info(endian) as usize)
+        } else {
+            // Section 0 must exist if e_phnum overflows.
+            Err(Error("Missing ELF section headers for e_phnum overflow"))
+        }
+    }
+
+    /// Return the `e_shnum` field of the header. Handles extended values.
+    ///
+    /// Returns `Err` for invalid values.
+    fn shnum<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Self::Endian,
+        data: R,
+    ) -> read::Result<usize> {
+        let e_shnum = self.e_shnum(endian);
+        if e_shnum > 0 {
+            Ok(e_shnum as usize)
+        } else if let Some(section_0) = self.section_0(endian, data)? {
+            section_0
+                .sh_size(endian)
+                .into()
+                .try_into()
+                .ok()
+                .read_error("Invalid ELF extended e_shnum")
+        } else {
+            // No section headers is ok.
+            Ok(0)
+        }
+    }
+
+    /// Return the `e_shstrndx` field of the header. Handles extended values.
+    ///
+    /// Returns `Err` for invalid values (including if the index is 0).
+    fn shstrndx<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Self::Endian,
+        data: R,
+    ) -> read::Result<u32> {
+        let e_shstrndx = self.e_shstrndx(endian);
+        let index = if e_shstrndx != elf::SHN_XINDEX {
+            e_shstrndx.into()
+        } else if let Some(section_0) = self.section_0(endian, data)? {
+            section_0.sh_link(endian)
+        } else {
+            // Section 0 must exist if we're trying to read e_shstrndx.
+            return Err(Error("Missing ELF section headers for e_shstrndx overflow"));
+        };
+        if index == 0 {
+            return Err(Error("Missing ELF e_shstrndx"));
+        }
+        Ok(index)
+    }
+
+    /// Return the slice of program headers.
+    ///
+    /// Returns `Ok(&[])` if there are no program headers.
+    /// Returns `Err` for invalid values.
+    fn program_headers<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Self::Endian,
+        data: R,
+    ) -> read::Result<&'data [Self::ProgramHeader]> {
+        let phoff: u64 = self.e_phoff(endian).into();
+        if phoff == 0 {
+            // No program headers is ok.
+            return Ok(&[]);
+        }
+        let phnum = self.phnum(endian, data)?;
+        if phnum == 0 {
+            // No program headers is ok.
+            return Ok(&[]);
+        }
+        let phentsize = self.e_phentsize(endian) as usize;
+        if phentsize != mem::size_of::<Self::ProgramHeader>() {
+            // Program header size must match.
+            return Err(Error("Invalid ELF program header entry size"));
+        }
+        data.read_slice_at(phoff, phnum)
+            .read_error("Invalid ELF program header size or alignment")
+    }
+
+    /// Return the slice of section headers.
+    ///
+    /// Returns `Ok(&[])` if there are no section headers.
+    /// Returns `Err` for invalid values.
+    fn section_headers<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Self::Endian,
+        data: R,
+    ) -> read::Result<&'data [Self::SectionHeader]> {
+        let shoff: u64 = self.e_shoff(endian).into();
+        if shoff == 0 {
+            // No section headers is ok.
+            return Ok(&[]);
+        }
+        let shnum = self.shnum(endian, data)?;
+        if shnum == 0 {
+            // No section headers is ok.
+            return Ok(&[]);
+        }
+        let shentsize = usize::from(self.e_shentsize(endian));
+        if shentsize != mem::size_of::<Self::SectionHeader>() {
+            // Section header size must match.
+            return Err(Error("Invalid ELF section header entry size"));
+        }
+        data.read_slice_at(shoff, shnum)
+            .read_error("Invalid ELF section header offset/size/alignment")
+    }
+
+    /// Return the string table for the section headers.
+    fn section_strings<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Self::Endian,
+        data: R,
+        sections: &[Self::SectionHeader],
+    ) -> read::Result<StringTable<'data, R>> {
+        if sections.is_empty() {
+            return Ok(StringTable::default());
+        }
+        let index = self.shstrndx(endian, data)? as usize;
+        let shstrtab = sections.get(index).read_error("Invalid ELF e_shstrndx")?;
+        let strings = if let Some((shstrtab_offset, shstrtab_size)) = shstrtab.file_range(endian) {
+            let shstrtab_end = shstrtab_offset
+                .checked_add(shstrtab_size)
+                .read_error("Invalid ELF shstrtab size")?;
+            StringTable::new(data, shstrtab_offset, shstrtab_end)
+        } else {
+            StringTable::default()
+        };
+        Ok(strings)
+    }
+
+    /// Return the section table.
+    fn sections<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Self::Endian,
+        data: R,
+    ) -> read::Result<SectionTable<'data, Self, R>> {
+        let sections = self.section_headers(endian, data)?;
+        let strings = self.section_strings(endian, data, sections)?;
+        Ok(SectionTable::new(sections, strings))
+    }
+
+    /// Returns whether this is a mips64el elf file.
+    fn is_mips64el(&self, endian: Self::Endian) -> bool {
+        self.is_class_64() && self.is_little_endian() && self.e_machine(endian) == elf::EM_MIPS
+    }
+}
+
+impl<Endian: endian::Endian> FileHeader for elf::FileHeader32<Endian> {
+    type Word = u32;
+    type Sword = i32;
+    type Endian = Endian;
+    type ProgramHeader = elf::ProgramHeader32<Endian>;
+    type SectionHeader = elf::SectionHeader32<Endian>;
+    type CompressionHeader = elf::CompressionHeader32<Endian>;
+    type NoteHeader = elf::NoteHeader32<Endian>;
+    type Dyn = elf::Dyn32<Endian>;
+    type Sym = elf::Sym32<Endian>;
+    type Rel = elf::Rel32<Endian>;
+    type Rela = elf::Rela32<Endian>;
+
+    #[inline]
+    fn is_type_64(&self) -> bool {
+        false
+    }
+
+    #[inline]
+    fn is_type_64_sized() -> bool
+    where
+        Self: Sized,
+    {
+        false
+    }
+
+    #[inline]
+    fn e_ident(&self) -> &elf::Ident {
+        &self.e_ident
+    }
+
+    #[inline]
+    fn e_type(&self, endian: Self::Endian) -> u16 {
+        self.e_type.get(endian)
+    }
+
+    #[inline]
+    fn e_machine(&self, endian: Self::Endian) -> u16 {
+        self.e_machine.get(endian)
+    }
+
+    #[inline]
+    fn e_version(&self, endian: Self::Endian) -> u32 {
+        self.e_version.get(endian)
+    }
+
+    #[inline]
+    fn e_entry(&self, endian: Self::Endian) -> Self::Word {
+        self.e_entry.get(endian)
+    }
+
+    #[inline]
+    fn e_phoff(&self, endian: Self::Endian) -> Self::Word {
+        self.e_phoff.get(endian)
+    }
+
+    #[inline]
+    fn e_shoff(&self, endian: Self::Endian) -> Self::Word {
+        self.e_shoff.get(endian)
+    }
+
+    #[inline]
+    fn e_flags(&self, endian: Self::Endian) -> u32 {
+        self.e_flags.get(endian)
+    }
+
+    #[inline]
+    fn e_ehsize(&self, endian: Self::Endian) -> u16 {
+        self.e_ehsize.get(endian)
+    }
+
+    #[inline]
+    fn e_phentsize(&self, endian: Self::Endian) -> u16 {
+        self.e_phentsize.get(endian)
+    }
+
+    #[inline]
+    fn e_phnum(&self, endian: Self::Endian) -> u16 {
+        self.e_phnum.get(endian)
+    }
+
+    #[inline]
+    fn e_shentsize(&self, endian: Self::Endian) -> u16 {
+        self.e_shentsize.get(endian)
+    }
+
+    #[inline]
+    fn e_shnum(&self, endian: Self::Endian) -> u16 {
+        self.e_shnum.get(endian)
+    }
+
+    #[inline]
+    fn e_shstrndx(&self, endian: Self::Endian) -> u16 {
+        self.e_shstrndx.get(endian)
+    }
+}
+
+impl<Endian: endian::Endian> FileHeader for elf::FileHeader64<Endian> {
+    type Word = u64;
+    type Sword = i64;
+    type Endian = Endian;
+    type ProgramHeader = elf::ProgramHeader64<Endian>;
+    type SectionHeader = elf::SectionHeader64<Endian>;
+    type CompressionHeader = elf::CompressionHeader64<Endian>;
+    type NoteHeader = elf::NoteHeader32<Endian>;
+    type Dyn = elf::Dyn64<Endian>;
+    type Sym = elf::Sym64<Endian>;
+    type Rel = elf::Rel64<Endian>;
+    type Rela = elf::Rela64<Endian>;
+
+    #[inline]
+    fn is_type_64(&self) -> bool {
+        true
+    }
+
+    #[inline]
+    fn is_type_64_sized() -> bool
+    where
+        Self: Sized,
+    {
+        true
+    }
+
+    #[inline]
+    fn e_ident(&self) -> &elf::Ident {
+        &self.e_ident
+    }
+
+    #[inline]
+    fn e_type(&self, endian: Self::Endian) -> u16 {
+        self.e_type.get(endian)
+    }
+
+    #[inline]
+    fn e_machine(&self, endian: Self::Endian) -> u16 {
+        self.e_machine.get(endian)
+    }
+
+    #[inline]
+    fn e_version(&self, endian: Self::Endian) -> u32 {
+        self.e_version.get(endian)
+    }
+
+    #[inline]
+    fn e_entry(&self, endian: Self::Endian) -> Self::Word {
+        self.e_entry.get(endian)
+    }
+
+    #[inline]
+    fn e_phoff(&self, endian: Self::Endian) -> Self::Word {
+        self.e_phoff.get(endian)
+    }
+
+    #[inline]
+    fn e_shoff(&self, endian: Self::Endian) -> Self::Word {
+        self.e_shoff.get(endian)
+    }
+
+    #[inline]
+    fn e_flags(&self, endian: Self::Endian) -> u32 {
+        self.e_flags.get(endian)
+    }
+
+    #[inline]
+    fn e_ehsize(&self, endian: Self::Endian) -> u16 {
+        self.e_ehsize.get(endian)
+    }
+
+    #[inline]
+    fn e_phentsize(&self, endian: Self::Endian) -> u16 {
+        self.e_phentsize.get(endian)
+    }
+
+    #[inline]
+    fn e_phnum(&self, endian: Self::Endian) -> u16 {
+        self.e_phnum.get(endian)
+    }
+
+    #[inline]
+    fn e_shentsize(&self, endian: Self::Endian) -> u16 {
+        self.e_shentsize.get(endian)
+    }
+
+    #[inline]
+    fn e_shnum(&self, endian: Self::Endian) -> u16 {
+        self.e_shnum.get(endian)
+    }
+
+    #[inline]
+    fn e_shstrndx(&self, endian: Self::Endian) -> u16 {
+        self.e_shstrndx.get(endian)
+    }
+}

vendor/object/src/read/elf/hash.rs

@@ -0,0 +1,224 @@
+use core::mem;
+
+use crate::elf;
+use crate::read::{ReadError, ReadRef, Result};
+use crate::{U32, U64};
+
+use super::{FileHeader, Sym, SymbolTable, Version, VersionTable};
+
+/// A SysV symbol hash table in an ELF file.
+///
+/// Returned by [`SectionHeader::hash`](super::SectionHeader::hash).
+#[derive(Debug)]
+pub struct HashTable<'data, Elf: FileHeader> {
+    buckets: &'data [U32<Elf::Endian>],
+    chains: &'data [U32<Elf::Endian>],
+}
+
+impl<'data, Elf: FileHeader> HashTable<'data, Elf> {
+    /// Parse a SysV hash table.
+    ///
+    /// `data` should be from an [`elf::SHT_HASH`] section, or from a
+    /// segment pointed to via the [`elf::DT_HASH`] entry.
+    ///
+    /// The header is read at offset 0 in the given `data`.
+    pub fn parse(endian: Elf::Endian, data: &'data [u8]) -> Result<Self> {
+        let mut offset = 0;
+        let header = data
+            .read::<elf::HashHeader<Elf::Endian>>(&mut offset)
+            .read_error("Invalid hash header")?;
+        let buckets = data
+            .read_slice(&mut offset, header.bucket_count.get(endian) as usize)
+            .read_error("Invalid hash buckets")?;
+        let chains = data
+            .read_slice(&mut offset, header.chain_count.get(endian) as usize)
+            .read_error("Invalid hash chains")?;
+        Ok(HashTable { buckets, chains })
+    }
+
+    /// Return the symbol table length.
+    pub fn symbol_table_length(&self) -> u32 {
+        self.chains.len() as u32
+    }
+
+    /// Use the hash table to find the symbol table entry with the given name, hash and version.
+    pub fn find<R: ReadRef<'data>>(
+        &self,
+        endian: Elf::Endian,
+        name: &[u8],
+        hash: u32,
+        version: Option<&Version<'_>>,
+        symbols: &SymbolTable<'data, Elf, R>,
+        versions: &VersionTable<'data, Elf>,
+    ) -> Option<(usize, &'data Elf::Sym)> {
+        // Get the chain start from the bucket for this hash.
+        let mut index = self.buckets[(hash as usize) % self.buckets.len()].get(endian) as usize;
+        // Avoid infinite loop.
+        let mut i = 0;
+        let strings = symbols.strings();
+        while index != 0 && i < self.chains.len() {
+            if let Ok(symbol) = symbols.symbol(index) {
+                if symbol.name(endian, strings) == Ok(name)
+                    && versions.matches(endian, index, version)
+                {
+                    return Some((index, symbol));
+                }
+            }
+            index = self.chains.get(index)?.get(endian) as usize;
+            i += 1;
+        }
+        None
+    }
+}
+
+/// A GNU symbol hash table in an ELF file.
+///
+/// Returned by [`SectionHeader::gnu_hash`](super::SectionHeader::gnu_hash).
+#[derive(Debug)]
+pub struct GnuHashTable<'data, Elf: FileHeader> {
+    symbol_base: u32,
+    bloom_shift: u32,
+    bloom_filters: &'data [u8],
+    buckets: &'data [U32<Elf::Endian>],
+    values: &'data [U32<Elf::Endian>],
+}
+
+impl<'data, Elf: FileHeader> GnuHashTable<'data, Elf> {
+    /// Parse a GNU hash table.
+    ///
+    /// `data` should be from an [`elf::SHT_GNU_HASH`] section, or from a
+    /// segment pointed to via the [`elf::DT_GNU_HASH`] entry.
+    ///
+    /// The header is read at offset 0 in the given `data`.
+    ///
+    /// The header does not contain a length field, and so all of `data`
+    /// will be used as the hash table values. It does not matter if this
+    /// is longer than needed, and this will often the case when accessing
+    /// the hash table via the [`elf::DT_GNU_HASH`] entry.
+    pub fn parse(endian: Elf::Endian, data: &'data [u8]) -> Result<Self> {
+        let mut offset = 0;
+        let header = data
+            .read::<elf::GnuHashHeader<Elf::Endian>>(&mut offset)
+            .read_error("Invalid GNU hash header")?;
+        let bloom_len =
+            u64::from(header.bloom_count.get(endian)) * mem::size_of::<Elf::Word>() as u64;
+        let bloom_filters = data
+            .read_bytes(&mut offset, bloom_len)
+            .read_error("Invalid GNU hash bloom filters")?;
+        let buckets = data
+            .read_slice(&mut offset, header.bucket_count.get(endian) as usize)
+            .read_error("Invalid GNU hash buckets")?;
+        let chain_count = (data.len() - offset as usize) / 4;
+        let values = data
+            .read_slice(&mut offset, chain_count)
+            .read_error("Invalid GNU hash values")?;
+        Ok(GnuHashTable {
+            symbol_base: header.symbol_base.get(endian),
+            bloom_shift: header.bloom_shift.get(endian),
+            bloom_filters,
+            buckets,
+            values,
+        })
+    }
+
+    /// Return the symbol table index of the first symbol in the hash table.
+    pub fn symbol_base(&self) -> u32 {
+        self.symbol_base
+    }
+
+    /// Determine the symbol table length by finding the last entry in the hash table.
+    ///
+    /// Returns `None` if the hash table is empty or invalid.
+    pub fn symbol_table_length(&self, endian: Elf::Endian) -> Option<u32> {
+        // Ensure we find a non-empty bucket.
+        if self.symbol_base == 0 {
+            return None;
+        }
+
+        // Find the highest chain index in a bucket.
+        let mut max_symbol = 0;
+        for bucket in self.buckets {
+            let bucket = bucket.get(endian);
+            if max_symbol < bucket {
+                max_symbol = bucket;
+            }
+        }
+
+        // Find the end of the chain.
+        for value in self
+            .values
+            .get(max_symbol.checked_sub(self.symbol_base)? as usize..)?
+        {
+            max_symbol += 1;
+            if value.get(endian) & 1 != 0 {
+                return Some(max_symbol);
+            }
+        }
+
+        None
+    }
+
+    /// Use the hash table to find the symbol table entry with the given name, hash, and version.
+    pub fn find<R: ReadRef<'data>>(
+        &self,
+        endian: Elf::Endian,
+        name: &[u8],
+        hash: u32,
+        version: Option<&Version<'_>>,
+        symbols: &SymbolTable<'data, Elf, R>,
+        versions: &VersionTable<'data, Elf>,
+    ) -> Option<(usize, &'data Elf::Sym)> {
+        let word_bits = mem::size_of::<Elf::Word>() as u32 * 8;
+
+        // Test against bloom filter.
+        let bloom_count = self.bloom_filters.len() / mem::size_of::<Elf::Word>();
+        let offset =
+            ((hash / word_bits) & (bloom_count as u32 - 1)) * mem::size_of::<Elf::Word>() as u32;
+        let filter = if word_bits == 64 {
+            self.bloom_filters
+                .read_at::<U64<Elf::Endian>>(offset.into())
+                .ok()?
+                .get(endian)
+        } else {
+            self.bloom_filters
+                .read_at::<U32<Elf::Endian>>(offset.into())
+                .ok()?
+                .get(endian)
+                .into()
+        };
+        if filter & (1 << (hash % word_bits)) == 0 {
+            return None;
+        }
+        if filter & (1 << ((hash >> self.bloom_shift) % word_bits)) == 0 {
+            return None;
+        }
+
+        // Get the chain start from the bucket for this hash.
+        let mut index = self.buckets[(hash as usize) % self.buckets.len()].get(endian) as usize;
+        if index == 0 {
+            return None;
+        }
+
+        // Test symbols in the chain.
+        let strings = symbols.strings();
+        let symbols = symbols.symbols().get(index..)?;
+        let values = self
+            .values
+            .get(index.checked_sub(self.symbol_base as usize)?..)?;
+        for (symbol, value) in symbols.iter().zip(values.iter()) {
+            let value = value.get(endian);
+            if value | 1 == hash | 1 {
+                if symbol.name(endian, strings) == Ok(name)
+                    && versions.matches(endian, index, version)
+                {
+                    return Some((index, symbol));
+                }
+            }
+            if value & 1 != 0 {
+                break;
+            }
+            index += 1;
+        }
+        None
+    }
+}

vendor/object/src/read/elf/mod.rs

@@ -0,0 +1,78 @@
+//! Support for reading ELF files.
+//!
+//! Traits are used to abstract over the difference between 32-bit and 64-bit ELF.
+//! The primary trait for this is [`FileHeader`].
+//!
+//! ## High level API
+//!
+//! [`ElfFile`] implements the [`Object`](crate::read::Object) trait for ELF files.
+//! [`ElfFile`] is parameterised by [`FileHeader`] to allow reading both 32-bit and
+//! 64-bit ELF. There are type aliases for these parameters ([`ElfFile32`] and
+//! [`ElfFile64`]).
+//!
+//! ## Low level API
+//!
+//! The [`FileHeader`] trait can be directly used to parse both [`elf::FileHeader32`]
+//! and [`elf::FileHeader64`].
+//!
+//! ### Example for low level API
+//!  ```no_run
+//! use object::elf;
+//! use object::read::elf::{FileHeader, Sym};
+//! use std::error::Error;
+//! use std::fs;
+//!
+//! /// Reads a file and displays the name of each symbol.
+//! fn main() -> Result<(), Box<dyn Error>> {
+//! #   #[cfg(feature = "std")] {
+//!     let data = fs::read("path/to/binary")?;
+//!     let elf = elf::FileHeader64::<object::Endianness>::parse(&*data)?;
+//!     let endian = elf.endian()?;
+//!     let sections = elf.sections(endian, &*data)?;
+//!     let symbols = sections.symbols(endian, &*data, elf::SHT_SYMTAB)?;
+//!     for symbol in symbols.iter() {
+//!         let name = symbol.name(endian, symbols.strings())?;
+//!         println!("{}", String::from_utf8_lossy(name));
+//!     }
+//! #   }
+//!     Ok(())
+//! }
+//! ```
+#[cfg(doc)]
+use crate::elf;
+
+mod file;
+pub use file::*;
+
+mod segment;
+pub use segment::*;
+
+mod section;
+pub use section::*;
+
+mod symbol;
+pub use symbol::*;
+
+mod relocation;
+pub use relocation::*;
+
+mod comdat;
+pub use comdat::*;
+
+mod dynamic;
+pub use dynamic::*;
+
+mod compression;
+pub use compression::*;
+
+mod note;
+pub use note::*;
+
+mod hash;
+pub use hash::*;
+
+mod version;
+pub use version::*;
+
+mod attributes;
+pub use attributes::*;

vendor/object/src/read/elf/note.rs

@@ -0,0 +1,271 @@
+use core::fmt::Debug;
+use core::mem;
+
+use crate::elf;
+use crate::endian::{self, U32};
+use crate::pod::Pod;
+use crate::read::util;
+use crate::read::{self, Bytes, Error, ReadError};
+
+use super::FileHeader;
+
+/// An iterator over the notes in an ELF section or segment.
+///
+/// Returned [`ProgramHeader::notes`](super::ProgramHeader::notes)
+/// and [`SectionHeader::notes`](super::SectionHeader::notes).
+#[derive(Debug)]
+pub struct NoteIterator<'data, Elf>
+where
+    Elf: FileHeader,
+{
+    endian: Elf::Endian,
+    align: usize,
+    data: Bytes<'data>,
+}
+
+impl<'data, Elf> NoteIterator<'data, Elf>
+where
+    Elf: FileHeader,
+{
+    /// An iterator over the notes in an ELF section or segment.
+    ///
+    /// `align` should be from the `p_align` field of the segment,
+    /// or the `sh_addralign` field of the section. Supported values are
+    /// either 4 or 8, but values less than 4 are treated as 4.
+    /// This matches the behaviour of binutils.
+    ///
+    /// Returns `Err` if `align` is invalid.
+    pub fn new(endian: Elf::Endian, align: Elf::Word, data: &'data [u8]) -> read::Result<Self> {
+        let align = match align.into() {
+            0u64..=4 => 4,
+            8 => 8,
+            _ => return Err(Error("Invalid ELF note alignment")),
+        };
+        // TODO: check data alignment?
+        Ok(NoteIterator {
+            endian,
+            align,
+            data: Bytes(data),
+        })
+    }
+
+    /// Returns the next note.
+    pub fn next(&mut self) -> read::Result<Option<Note<'data, Elf>>> {
+        let mut data = self.data;
+        if data.is_empty() {
+            return Ok(None);
+        }
+
+        let header = data
+            .read_at::<Elf::NoteHeader>(0)
+            .read_error("ELF note is too short")?;
+
+        // The name has no alignment requirement.
+        let offset = mem::size_of::<Elf::NoteHeader>();
+        let namesz = header.n_namesz(self.endian) as usize;
+        let name = data
+            .read_bytes_at(offset, namesz)
+            .read_error("Invalid ELF note namesz")?
+            .0;
+
+        // The descriptor must be aligned.
+        let offset = util::align(offset + namesz, self.align);
+        let descsz = header.n_descsz(self.endian) as usize;
+        let desc = data
+            .read_bytes_at(offset, descsz)
+            .read_error("Invalid ELF note descsz")?
+            .0;
+
+        // The next note (if any) must be aligned.
+        let offset = util::align(offset + descsz, self.align);
+        if data.skip(offset).is_err() {
+            data = Bytes(&[]);
+        }
+        self.data = data;
+
+        Ok(Some(Note { header, name, desc }))
+    }
+}
+
+/// A parsed [`NoteHeader`].
+#[derive(Debug)]
+pub struct Note<'data, Elf>
+where
+    Elf: FileHeader,
+{
+    header: &'data Elf::NoteHeader,
+    name: &'data [u8],
+    desc: &'data [u8],
+}
+
+impl<'data, Elf: FileHeader> Note<'data, Elf> {
+    /// Return the `n_type` field of the `NoteHeader`.
+    ///
+    /// The meaning of this field is determined by `name`.
+    pub fn n_type(&self, endian: Elf::Endian) -> u32 {
+        self.header.n_type(endian)
+    }
+
+    /// Return the `n_namesz` field of the `NoteHeader`.
+    pub fn n_namesz(&self, endian: Elf::Endian) -> u32 {
+        self.header.n_namesz(endian)
+    }
+
+    /// Return the `n_descsz` field of the `NoteHeader`.
+    pub fn n_descsz(&self, endian: Elf::Endian) -> u32 {
+        self.header.n_descsz(endian)
+    }
+
+    /// Return the bytes for the name field following the `NoteHeader`.
+    ///
+    /// This field is usually a string including one or more trailing null bytes
+    /// (but it is not required to be).
+    ///
+    /// The length of this field is given by `n_namesz`.
+    pub fn name_bytes(&self) -> &'data [u8] {
+        self.name
+    }
+
+    /// Return the bytes for the name field following the `NoteHeader`,
+    /// excluding all trailing null bytes.
+    pub fn name(&self) -> &'data [u8] {
+        let mut name = self.name;
+        while let [rest @ .., 0] = name {
+            name = rest;
+        }
+        name
+    }
+
+    /// Return the bytes for the desc field following the `NoteHeader`.
+    ///
+    /// The length of this field is given by `n_descsz`. The meaning
+    /// of this field is determined by `name` and `n_type`.
+    pub fn desc(&self) -> &'data [u8] {
+        self.desc
+    }
+
+    /// Return an iterator for properties if this note's type is [`elf::NT_GNU_PROPERTY_TYPE_0`].
+    pub fn gnu_properties(
+        &self,
+        endian: Elf::Endian,
+    ) -> Option<GnuPropertyIterator<'data, Elf::Endian>> {
+        if self.name() != elf::ELF_NOTE_GNU || self.n_type(endian) != elf::NT_GNU_PROPERTY_TYPE_0 {
+            return None;
+        }
+        // Use the ELF class instead of the section alignment.
+        // This matches what other parsers do.
+        let align = if Elf::is_type_64_sized() { 8 } else { 4 };
+        Some(GnuPropertyIterator {
+            endian,
+            align,
+            data: Bytes(self.desc),
+        })
+    }
+}
+
+/// A trait for generic access to [`elf::NoteHeader32`] and [`elf::NoteHeader64`].
+#[allow(missing_docs)]
+pub trait NoteHeader: Debug + Pod {
+    type Endian: endian::Endian;
+
+    fn n_namesz(&self, endian: Self::Endian) -> u32;
+    fn n_descsz(&self, endian: Self::Endian) -> u32;
+    fn n_type(&self, endian: Self::Endian) -> u32;
+}
+
+impl<Endian: endian::Endian> NoteHeader for elf::NoteHeader32<Endian> {
+    type Endian = Endian;
+
+    #[inline]
+    fn n_namesz(&self, endian: Self::Endian) -> u32 {
+        self.n_namesz.get(endian)
+    }
+
+    #[inline]
+    fn n_descsz(&self, endian: Self::Endian) -> u32 {
+        self.n_descsz.get(endian)
+    }
+
+    #[inline]
+    fn n_type(&self, endian: Self::Endian) -> u32 {
+        self.n_type.get(endian)
+    }
+}
+
+impl<Endian: endian::Endian> NoteHeader for elf::NoteHeader64<Endian> {
+    type Endian = Endian;
+
+    #[inline]
+    fn n_namesz(&self, endian: Self::Endian) -> u32 {
+        self.n_namesz.get(endian)
+    }
+
+    #[inline]
+    fn n_descsz(&self, endian: Self::Endian) -> u32 {
+        self.n_descsz.get(endian)
+    }
+
+    #[inline]
+    fn n_type(&self, endian: Self::Endian) -> u32 {
+        self.n_type.get(endian)
+    }
+}
+
+/// An iterator for the properties in a [`elf::NT_GNU_PROPERTY_TYPE_0`] note.
+///
+/// Returned by [`Note::gnu_properties`].
+#[derive(Debug)]
+pub struct GnuPropertyIterator<'data, Endian: endian::Endian> {
+    endian: Endian,
+    align: usize,
+    data: Bytes<'data>,
+}
+
+impl<'data, Endian: endian::Endian> GnuPropertyIterator<'data, Endian> {
+    /// Returns the next property.
+    pub fn next(&mut self) -> read::Result<Option<GnuProperty<'data>>> {
+        let mut data = self.data;
+        if data.is_empty() {
+            return Ok(None);
+        }
+
+        (|| -> Result<_, ()> {
+            let pr_type = data.read_at::<U32<Endian>>(0)?.get(self.endian);
+            let pr_datasz = data.read_at::<U32<Endian>>(4)?.get(self.endian) as usize;
+            let pr_data = data.read_bytes_at(8, pr_datasz)?.0;
+            data.skip(util::align(8 + pr_datasz, self.align))?;
+            self.data = data;
+            Ok(Some(GnuProperty { pr_type, pr_data }))
+        })()
+        .read_error("Invalid ELF GNU property")
+    }
+}
+
+/// A property in a [`elf::NT_GNU_PROPERTY_TYPE_0`] note.
+#[derive(Debug)]
+pub struct GnuProperty<'data> {
+    pr_type: u32,
+    pr_data: &'data [u8],
+}
+
+impl<'data> GnuProperty<'data> {
+    /// Return the property type.
+    ///
+    /// This is one of the `GNU_PROPERTY_*` constants.
+    pub fn pr_type(&self) -> u32 {
+        self.pr_type
+    }
+
+    /// Return the property data.
+    pub fn pr_data(&self) -> &'data [u8] {
+        self.pr_data
+    }
+
+    /// Parse the property data as an unsigned 32-bit integer.
+    pub fn data_u32<E: endian::Endian>(&self, endian: E) -> read::Result<u32> {
+        Bytes(self.pr_data)
+            .read_at::<U32<E>>(0)
+            .read_error("Invalid ELF GNU property data")
+            .map(|val| val.get(endian))
+    }
+}

vendor/object/src/read/elf/relocation.rs

@@ -0,0 +1,628 @@
+use alloc::fmt;
+use alloc::vec::Vec;
+use core::fmt::Debug;
+use core::slice;
+
+use crate::elf;
+use crate::endian::{self, Endianness};
+use crate::pod::Pod;
+use crate::read::{
+    self, Error, ReadRef, Relocation, RelocationEncoding, RelocationKind, RelocationTarget,
+    SectionIndex, SymbolIndex,
+};
+
+use super::{ElfFile, FileHeader, SectionHeader, SectionTable};
+
+/// A mapping from section index to associated relocation sections.
+#[derive(Debug)]
+pub struct RelocationSections {
+    relocations: Vec<usize>,
+}
+
+impl RelocationSections {
+    /// Create a new mapping using the section table.
+    ///
+    /// Skips relocation sections that do not use the given symbol table section.
+    pub fn parse<'data, Elf: FileHeader, R: ReadRef<'data>>(
+        endian: Elf::Endian,
+        sections: &SectionTable<'data, Elf, R>,
+        symbol_section: SectionIndex,
+    ) -> read::Result<Self> {
+        let mut relocations = vec![0; sections.len()];
+        for (index, section) in sections.iter().enumerate().rev() {
+            let sh_type = section.sh_type(endian);
+            if sh_type == elf::SHT_REL || sh_type == elf::SHT_RELA {
+                // The symbol indices used in relocations must be for the symbol table
+                // we are expecting to use.
+                let sh_link = SectionIndex(section.sh_link(endian) as usize);
+                if sh_link != symbol_section {
+                    continue;
+                }
+
+                let sh_info = section.sh_info(endian) as usize;
+                if sh_info == 0 {
+                    // Skip dynamic relocations.
+                    continue;
+                }
+                if sh_info >= relocations.len() {
+                    return Err(Error("Invalid ELF sh_info for relocation section"));
+                }
+
+                // Handle multiple relocation sections by chaining them.
+                let next = relocations[sh_info];
+                relocations[sh_info] = index;
+                relocations[index] = next;
+            }
+        }
+        Ok(Self { relocations })
+    }
+
+    /// Given a section index, return the section index of the associated relocation section.
+    ///
+    /// This may also be called with a relocation section index, and it will return the
+    /// next associated relocation section.
+    pub fn get(&self, index: usize) -> Option<usize> {
+        self.relocations.get(index).cloned().filter(|x| *x != 0)
+    }
+}
+
+pub(super) enum ElfRelaIterator<'data, Elf: FileHeader> {
+    Rel(slice::Iter<'data, Elf::Rel>),
+    Rela(slice::Iter<'data, Elf::Rela>),
+}
+
+impl<'data, Elf: FileHeader> ElfRelaIterator<'data, Elf> {
+    fn is_rel(&self) -> bool {
+        match self {
+            ElfRelaIterator::Rel(_) => true,
+            ElfRelaIterator::Rela(_) => false,
+        }
+    }
+}
+
+impl<'data, Elf: FileHeader> Iterator for ElfRelaIterator<'data, Elf> {
+    type Item = Elf::Rela;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        match self {
+            ElfRelaIterator::Rel(ref mut i) => i.next().cloned().map(Self::Item::from),
+            ElfRelaIterator::Rela(ref mut i) => i.next().cloned(),
+        }
+    }
+}
+
+/// An iterator for the dynamic relocations in an [`ElfFile32`](super::ElfFile32).
+pub type ElfDynamicRelocationIterator32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    ElfDynamicRelocationIterator<'data, 'file, elf::FileHeader32<Endian>, R>;
+/// An iterator for the dynamic relocations in an [`ElfFile64`](super::ElfFile64).
+pub type ElfDynamicRelocationIterator64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    ElfDynamicRelocationIterator<'data, 'file, elf::FileHeader64<Endian>, R>;
+
+/// An iterator for the dynamic relocations in an [`ElfFile`].
+pub struct ElfDynamicRelocationIterator<'data, 'file, Elf, R = &'data [u8]>
+where
+    Elf: FileHeader,
+    R: ReadRef<'data>,
+{
+    /// The current relocation section index.
+    pub(super) section_index: SectionIndex,
+    pub(super) file: &'file ElfFile<'data, Elf, R>,
+    pub(super) relocations: Option<ElfRelaIterator<'data, Elf>>,
+}
+
+impl<'data, 'file, Elf, R> Iterator for ElfDynamicRelocationIterator<'data, 'file, Elf, R>
+where
+    Elf: FileHeader,
+    R: ReadRef<'data>,
+{
+    type Item = (u64, Relocation);
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let endian = self.file.endian;
+        loop {
+            if let Some(ref mut relocations) = self.relocations {
+                if let Some(reloc) = relocations.next() {
+                    let relocation =
+                        parse_relocation(self.file.header, endian, reloc, relocations.is_rel());
+                    return Some((reloc.r_offset(endian).into(), relocation));
+                }
+                self.relocations = None;
+            }
+
+            let section = self.file.sections.section(self.section_index).ok()?;
+            self.section_index.0 += 1;
+
+            let sh_link = SectionIndex(section.sh_link(endian) as usize);
+            if sh_link != self.file.dynamic_symbols.section() {
+                continue;
+            }
+
+            match section.sh_type(endian) {
+                elf::SHT_REL => {
+                    if let Ok(relocations) = section.data_as_array(endian, self.file.data) {
+                        self.relocations = Some(ElfRelaIterator::Rel(relocations.iter()));
+                    }
+                }
+                elf::SHT_RELA => {
+                    if let Ok(relocations) = section.data_as_array(endian, self.file.data) {
+                        self.relocations = Some(ElfRelaIterator::Rela(relocations.iter()));
+                    }
+                }
+                _ => {}
+            }
+        }
+    }
+}
+
+impl<'data, 'file, Elf, R> fmt::Debug for ElfDynamicRelocationIterator<'data, 'file, Elf, R>
+where
+    Elf: FileHeader,
+    R: ReadRef<'data>,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("ElfDynamicRelocationIterator").finish()
+    }
+}
+
+/// An iterator for the relocations for an [`ElfSection32`](super::ElfSection32).
+pub type ElfSectionRelocationIterator32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    ElfSectionRelocationIterator<'data, 'file, elf::FileHeader32<Endian>, R>;
+/// An iterator for the relocations for an [`ElfSection64`](super::ElfSection64).
+pub type ElfSectionRelocationIterator64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    ElfSectionRelocationIterator<'data, 'file, elf::FileHeader64<Endian>, R>;
+
+/// An iterator for the relocations for an [`ElfSection`](super::ElfSection).
+pub struct ElfSectionRelocationIterator<'data, 'file, Elf, R = &'data [u8]>
+where
+    Elf: FileHeader,
+    R: ReadRef<'data>,
+{
+    /// The current pointer in the chain of relocation sections.
+    pub(super) section_index: SectionIndex,
+    pub(super) file: &'file ElfFile<'data, Elf, R>,
+    pub(super) relocations: Option<ElfRelaIterator<'data, Elf>>,
+}
+
+impl<'data, 'file, Elf, R> Iterator for ElfSectionRelocationIterator<'data, 'file, Elf, R>
+where
+    Elf: FileHeader,
+    R: ReadRef<'data>,
+{
+    type Item = (u64, Relocation);
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let endian = self.file.endian;
+        loop {
+            if let Some(ref mut relocations) = self.relocations {
+                if let Some(reloc) = relocations.next() {
+                    let relocation =
+                        parse_relocation(self.file.header, endian, reloc, relocations.is_rel());
+                    return Some((reloc.r_offset(endian).into(), relocation));
+                }
+                self.relocations = None;
+            }
+            self.section_index = SectionIndex(self.file.relocations.get(self.section_index.0)?);
+            // The construction of RelocationSections ensures section_index is valid.
+            let section = self.file.sections.section(self.section_index).unwrap();
+            match section.sh_type(endian) {
+                elf::SHT_REL => {
+                    if let Ok(relocations) = section.data_as_array(endian, self.file.data) {
+                        self.relocations = Some(ElfRelaIterator::Rel(relocations.iter()));
+                    }
+                }
+                elf::SHT_RELA => {
+                    if let Ok(relocations) = section.data_as_array(endian, self.file.data) {
+                        self.relocations = Some(ElfRelaIterator::Rela(relocations.iter()));
+                    }
+                }
+                _ => {}
+            }
+        }
+    }
+}
+
+impl<'data, 'file, Elf, R> fmt::Debug for ElfSectionRelocationIterator<'data, 'file, Elf, R>
+where
+    Elf: FileHeader,
+    R: ReadRef<'data>,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("ElfSectionRelocationIterator").finish()
+    }
+}
+
+fn parse_relocation<Elf: FileHeader>(
+    header: &Elf,
+    endian: Elf::Endian,
+    reloc: Elf::Rela,
+    implicit_addend: bool,
+) -> Relocation {
+    let mut encoding = RelocationEncoding::Generic;
+    let is_mips64el = header.is_mips64el(endian);
+    let (kind, size) = match header.e_machine(endian) {
+        elf::EM_AARCH64 => {
+            if header.is_type_64() {
+                match reloc.r_type(endian, false) {
+                    elf::R_AARCH64_ABS64 => (RelocationKind::Absolute, 64),
+                    elf::R_AARCH64_ABS32 => (RelocationKind::Absolute, 32),
+                    elf::R_AARCH64_ABS16 => (RelocationKind::Absolute, 16),
+                    elf::R_AARCH64_PREL64 => (RelocationKind::Relative, 64),
+                    elf::R_AARCH64_PREL32 => (RelocationKind::Relative, 32),
+                    elf::R_AARCH64_PREL16 => (RelocationKind::Relative, 16),
+                    elf::R_AARCH64_CALL26 => {
+                        encoding = RelocationEncoding::AArch64Call;
+                        (RelocationKind::PltRelative, 26)
+                    }
+                    r_type => (RelocationKind::Elf(r_type), 0),
+                }
+            } else {
+                match reloc.r_type(endian, false) {
+                    elf::R_AARCH64_P32_ABS32 => (RelocationKind::Absolute, 32),
+                    r_type => (RelocationKind::Elf(r_type), 0),
+                }
+            }
+        }
+        elf::EM_ARM => match reloc.r_type(endian, false) {
+            elf::R_ARM_ABS32 => (RelocationKind::Absolute, 32),
+            r_type => (RelocationKind::Elf(r_type), 0),
+        },
+        elf::EM_AVR => match reloc.r_type(endian, false) {
+            elf::R_AVR_32 => (RelocationKind::Absolute, 32),
+            elf::R_AVR_16 => (RelocationKind::Absolute, 16),
+            r_type => (RelocationKind::Elf(r_type), 0),
+        },
+        elf::EM_BPF => match reloc.r_type(endian, false) {
+            elf::R_BPF_64_64 => (RelocationKind::Absolute, 64),
+            elf::R_BPF_64_32 => (RelocationKind::Absolute, 32),
+            r_type => (RelocationKind::Elf(r_type), 0),
+        },
+        elf::EM_CSKY => match reloc.r_type(endian, false) {
+            elf::R_CKCORE_ADDR32 => (RelocationKind::Absolute, 32),
+            elf::R_CKCORE_PCREL32 => (RelocationKind::Relative, 32),
+            r_type => (RelocationKind::Elf(r_type), 0),
+        },
+        elf::EM_386 => match reloc.r_type(endian, false) {
+            elf::R_386_32 => (RelocationKind::Absolute, 32),
+            elf::R_386_PC32 => (RelocationKind::Relative, 32),
+            elf::R_386_GOT32 => (RelocationKind::Got, 32),
+            elf::R_386_PLT32 => (RelocationKind::PltRelative, 32),
+            elf::R_386_GOTOFF => (RelocationKind::GotBaseOffset, 32),
+            elf::R_386_GOTPC => (RelocationKind::GotBaseRelative, 32),
+            elf::R_386_16 => (RelocationKind::Absolute, 16),
+            elf::R_386_PC16 => (RelocationKind::Relative, 16),
+            elf::R_386_8 => (RelocationKind::Absolute, 8),
+            elf::R_386_PC8 => (RelocationKind::Relative, 8),
+            r_type => (RelocationKind::Elf(r_type), 0),
+        },
+        elf::EM_X86_64 => match reloc.r_type(endian, false) {
+            elf::R_X86_64_64 => (RelocationKind::Absolute, 64),
+            elf::R_X86_64_PC32 => (RelocationKind::Relative, 32),
+            elf::R_X86_64_GOT32 => (RelocationKind::Got, 32),
+            elf::R_X86_64_PLT32 => (RelocationKind::PltRelative, 32),
+            elf::R_X86_64_GOTPCREL => (RelocationKind::GotRelative, 32),
+            elf::R_X86_64_32 => (RelocationKind::Absolute, 32),
+            elf::R_X86_64_32S => {
+                encoding = RelocationEncoding::X86Signed;
+                (RelocationKind::Absolute, 32)
+            }
+            elf::R_X86_64_16 => (RelocationKind::Absolute, 16),
+            elf::R_X86_64_PC16 => (RelocationKind::Relative, 16),
+            elf::R_X86_64_8 => (RelocationKind::Absolute, 8),
+            elf::R_X86_64_PC8 => (RelocationKind::Relative, 8),
+            r_type => (RelocationKind::Elf(r_type), 0),
+        },
+        elf::EM_HEXAGON => match reloc.r_type(endian, false) {
+            elf::R_HEX_32 => (RelocationKind::Absolute, 32),
+            r_type => (RelocationKind::Elf(r_type), 0),
+        },
+        elf::EM_LOONGARCH => match reloc.r_type(endian, false) {
+            elf::R_LARCH_32 => (RelocationKind::Absolute, 32),
+            elf::R_LARCH_64 => (RelocationKind::Absolute, 64),
+            elf::R_LARCH_32_PCREL => (RelocationKind::Relative, 32),
+            elf::R_LARCH_64_PCREL => (RelocationKind::Relative, 64),
+            elf::R_LARCH_B16 => {
+                encoding = RelocationEncoding::LoongArchBranch;
+                (RelocationKind::Relative, 16)
+            }
+            elf::R_LARCH_B21 => {
+                encoding = RelocationEncoding::LoongArchBranch;
+                (RelocationKind::Relative, 21)
+            }
+            elf::R_LARCH_B26 => {
+                encoding = RelocationEncoding::LoongArchBranch;
+                (RelocationKind::Relative, 26)
+            }
+            r_type => (RelocationKind::Elf(r_type), 0),
+        },
+        elf::EM_MIPS => match reloc.r_type(endian, is_mips64el) {
+            elf::R_MIPS_16 => (RelocationKind::Absolute, 16),
+            elf::R_MIPS_32 => (RelocationKind::Absolute, 32),
+            elf::R_MIPS_64 => (RelocationKind::Absolute, 64),
+            r_type => (RelocationKind::Elf(r_type), 0),
+        },
+        elf::EM_MSP430 => match reloc.r_type(endian, false) {
+            elf::R_MSP430_32 => (RelocationKind::Absolute, 32),
+            elf::R_MSP430_16_BYTE => (RelocationKind::Absolute, 16),
+            r_type => (RelocationKind::Elf(r_type), 0),
+        },
+        elf::EM_PPC => match reloc.r_type(endian, false) {
+            elf::R_PPC_ADDR32 => (RelocationKind::Absolute, 32),
+            r_type => (RelocationKind::Elf(r_type), 0),
+        },
+        elf::EM_PPC64 => match reloc.r_type(endian, false) {
+            elf::R_PPC64_ADDR32 => (RelocationKind::Absolute, 32),
+            elf::R_PPC64_ADDR64 => (RelocationKind::Absolute, 64),
+            r_type => (RelocationKind::Elf(r_type), 0),
+        },
+        elf::EM_RISCV => match reloc.r_type(endian, false) {
+            elf::R_RISCV_32 => (RelocationKind::Absolute, 32),
+            elf::R_RISCV_64 => (RelocationKind::Absolute, 64),
+            r_type => (RelocationKind::Elf(r_type), 0),
+        },
+        elf::EM_S390 => match reloc.r_type(endian, false) {
+            elf::R_390_8 => (RelocationKind::Absolute, 8),
+            elf::R_390_16 => (RelocationKind::Absolute, 16),
+            elf::R_390_32 => (RelocationKind::Absolute, 32),
+            elf::R_390_64 => (RelocationKind::Absolute, 64),
+            elf::R_390_PC16 => (RelocationKind::Relative, 16),
+            elf::R_390_PC32 => (RelocationKind::Relative, 32),
+            elf::R_390_PC64 => (RelocationKind::Relative, 64),
+            elf::R_390_PC16DBL => {
+                encoding = RelocationEncoding::S390xDbl;
+                (RelocationKind::Relative, 16)
+            }
+            elf::R_390_PC32DBL => {
+                encoding = RelocationEncoding::S390xDbl;
+                (RelocationKind::Relative, 32)
+            }
+            elf::R_390_PLT16DBL => {
+                encoding = RelocationEncoding::S390xDbl;
+                (RelocationKind::PltRelative, 16)
+            }
+            elf::R_390_PLT32DBL => {
+                encoding = RelocationEncoding::S390xDbl;
+                (RelocationKind::PltRelative, 32)
+            }
+            elf::R_390_GOT16 => (RelocationKind::Got, 16),
+            elf::R_390_GOT32 => (RelocationKind::Got, 32),
+            elf::R_390_GOT64 => (RelocationKind::Got, 64),
+            elf::R_390_GOTENT => {
+                encoding = RelocationEncoding::S390xDbl;
+                (RelocationKind::GotRelative, 32)
+            }
+            elf::R_390_GOTOFF16 => (RelocationKind::GotBaseOffset, 16),
+            elf::R_390_GOTOFF32 => (RelocationKind::GotBaseOffset, 32),
+            elf::R_390_GOTOFF64 => (RelocationKind::GotBaseOffset, 64),
+            elf::R_390_GOTPC => (RelocationKind::GotBaseRelative, 64),
+            elf::R_390_GOTPCDBL => {
+                encoding = RelocationEncoding::S390xDbl;
+                (RelocationKind::GotBaseRelative, 32)
+            }
+            r_type => (RelocationKind::Elf(r_type), 0),
+        },
+        elf::EM_SBF => match reloc.r_type(endian, false) {
+            elf::R_SBF_64_64 => (RelocationKind::Absolute, 64),
+            elf::R_SBF_64_32 => (RelocationKind::Absolute, 32),
+            r_type => (RelocationKind::Elf(r_type), 0),
+        },
+        elf::EM_SHARC => match reloc.r_type(endian, false) {
+            elf::R_SHARC_ADDR24_V3 => {
+                encoding = RelocationEncoding::SharcTypeA;
+                (RelocationKind::Absolute, 24)
+            }
+            elf::R_SHARC_ADDR32_V3 => {
+                encoding = RelocationEncoding::SharcTypeA;
+                (RelocationKind::Absolute, 32)
+            }
+            elf::R_SHARC_ADDR_VAR_V3 => {
+                encoding = RelocationEncoding::Generic;
+                (RelocationKind::Absolute, 32)
+            }
+            elf::R_SHARC_PCRSHORT_V3 => {
+                encoding = RelocationEncoding::SharcTypeA;
+                (RelocationKind::Relative, 6)
+            }
+            elf::R_SHARC_PCRLONG_V3 => {
+                encoding = RelocationEncoding::SharcTypeA;
+                (RelocationKind::Relative, 24)
+            }
+            elf::R_SHARC_DATA6_V3 => {
+                encoding = RelocationEncoding::SharcTypeA;
+                (RelocationKind::Absolute, 6)
+            }
+            elf::R_SHARC_DATA16_V3 => {
+                encoding = RelocationEncoding::SharcTypeA;
+                (RelocationKind::Absolute, 16)
+            }
+            elf::R_SHARC_DATA6_VISA_V3 => {
+                encoding = RelocationEncoding::SharcTypeB;
+                (RelocationKind::Absolute, 6)
+            }
+            elf::R_SHARC_DATA7_VISA_V3 => {
+                encoding = RelocationEncoding::SharcTypeB;
+                (RelocationKind::Absolute, 7)
+            }
+            elf::R_SHARC_DATA16_VISA_V3 => {
+                encoding = RelocationEncoding::SharcTypeB;
+                (RelocationKind::Absolute, 16)
+            }
+            elf::R_SHARC_PCR6_VISA_V3 => {
+                encoding = RelocationEncoding::SharcTypeB;
+                (RelocationKind::Relative, 16)
+            }
+            elf::R_SHARC_ADDR_VAR16_V3 => {
+                encoding = RelocationEncoding::Generic;
+                (RelocationKind::Absolute, 16)
+            }
+            r_type => (RelocationKind::Elf(r_type), 0),
+        },
+        elf::EM_SPARC | elf::EM_SPARC32PLUS | elf::EM_SPARCV9 => {
+            match reloc.r_type(endian, false) {
+                elf::R_SPARC_32 | elf::R_SPARC_UA32 => (RelocationKind::Absolute, 32),
+                elf::R_SPARC_64 | elf::R_SPARC_UA64 => (RelocationKind::Absolute, 64),
+                r_type => (RelocationKind::Elf(r_type), 0),
+            }
+        }
+        elf::EM_XTENSA => match reloc.r_type(endian, false) {
+            elf::R_XTENSA_32 => (RelocationKind::Absolute, 32),
+            elf::R_XTENSA_32_PCREL => (RelocationKind::Relative, 32),
+            r_type => (RelocationKind::Elf(r_type), 0),
+        },
+        _ => (RelocationKind::Elf(reloc.r_type(endian, false)), 0),
+    };
+    let sym = reloc.r_sym(endian, is_mips64el) as usize;
+    let target = if sym == 0 {
+        RelocationTarget::Absolute
+    } else {
+        RelocationTarget::Symbol(SymbolIndex(sym))
+    };
+    Relocation {
+        kind,
+        encoding,
+        size,
+        target,
+        addend: reloc.r_addend(endian).into(),
+        implicit_addend,
+    }
+}
+
+/// A trait for generic access to [`elf::Rel32`] and [`elf::Rel64`].
+#[allow(missing_docs)]
+pub trait Rel: Debug + Pod + Clone {
+    type Word: Into<u64>;
+    type Sword: Into<i64>;
+    type Endian: endian::Endian;
+
+    fn r_offset(&self, endian: Self::Endian) -> Self::Word;
+    fn r_info(&self, endian: Self::Endian) -> Self::Word;
+    fn r_sym(&self, endian: Self::Endian) -> u32;
+    fn r_type(&self, endian: Self::Endian) -> u32;
+}
+
+impl<Endian: endian::Endian> Rel for elf::Rel32<Endian> {
+    type Word = u32;
+    type Sword = i32;
+    type Endian = Endian;
+
+    #[inline]
+    fn r_offset(&self, endian: Self::Endian) -> Self::Word {
+        self.r_offset.get(endian)
+    }
+
+    #[inline]
+    fn r_info(&self, endian: Self::Endian) -> Self::Word {
+        self.r_info.get(endian)
+    }
+
+    #[inline]
+    fn r_sym(&self, endian: Self::Endian) -> u32 {
+        self.r_sym(endian)
+    }
+
+    #[inline]
+    fn r_type(&self, endian: Self::Endian) -> u32 {
+        self.r_type(endian)
+    }
+}
+
+impl<Endian: endian::Endian> Rel for elf::Rel64<Endian> {
+    type Word = u64;
+    type Sword = i64;
+    type Endian = Endian;
+
+    #[inline]
+    fn r_offset(&self, endian: Self::Endian) -> Self::Word {
+        self.r_offset.get(endian)
+    }
+
+    #[inline]
+    fn r_info(&self, endian: Self::Endian) -> Self::Word {
+        self.r_info.get(endian)
+    }
+
+    #[inline]
+    fn r_sym(&self, endian: Self::Endian) -> u32 {
+        self.r_sym(endian)
+    }
+
+    #[inline]
+    fn r_type(&self, endian: Self::Endian) -> u32 {
+        self.r_type(endian)
+    }
+}
+
+/// A trait for generic access to [`elf::Rela32`] and [`elf::Rela64`].
+#[allow(missing_docs)]
+pub trait Rela: Debug + Pod + Clone {
+    type Word: Into<u64>;
+    type Sword: Into<i64>;
+    type Endian: endian::Endian;
+
+    fn r_offset(&self, endian: Self::Endian) -> Self::Word;
+    fn r_info(&self, endian: Self::Endian, is_mips64el: bool) -> Self::Word;
+    fn r_addend(&self, endian: Self::Endian) -> Self::Sword;
+    fn r_sym(&self, endian: Self::Endian, is_mips64el: bool) -> u32;
+    fn r_type(&self, endian: Self::Endian, is_mips64el: bool) -> u32;
+}
+
+impl<Endian: endian::Endian> Rela for elf::Rela32<Endian> {
+    type Word = u32;
+    type Sword = i32;
+    type Endian = Endian;
+
+    #[inline]
+    fn r_offset(&self, endian: Self::Endian) -> Self::Word {
+        self.r_offset.get(endian)
+    }
+
+    #[inline]
+    fn r_info(&self, endian: Self::Endian, _is_mips64el: bool) -> Self::Word {
+        self.r_info.get(endian)
+    }
+
+    #[inline]
+    fn r_addend(&self, endian: Self::Endian) -> Self::Sword {
+        self.r_addend.get(endian)
+    }
+
+    #[inline]
+    fn r_sym(&self, endian: Self::Endian, _is_mips64el: bool) -> u32 {
+        self.r_sym(endian)
+    }
+
+    #[inline]
+    fn r_type(&self, endian: Self::Endian, _is_mips64el: bool) -> u32 {
+        self.r_type(endian)
+    }
+}
+
+impl<Endian: endian::Endian> Rela for elf::Rela64<Endian> {
+    type Word = u64;
+    type Sword = i64;
+    type Endian = Endian;
+
+    #[inline]
+    fn r_offset(&self, endian: Self::Endian) -> Self::Word {
+        self.r_offset.get(endian)
+    }
+
+    #[inline]
+    fn r_info(&self, endian: Self::Endian, is_mips64el: bool) -> Self::Word {
+        self.get_r_info(endian, is_mips64el)
+    }
+
+    #[inline]
+    fn r_addend(&self, endian: Self::Endian) -> Self::Sword {
+        self.r_addend.get(endian)
+    }
+
+    #[inline]
+    fn r_sym(&self, endian: Self::Endian, is_mips64el: bool) -> u32 {
+        self.r_sym(endian, is_mips64el)
+    }
+
+    #[inline]
+    fn r_type(&self, endian: Self::Endian, is_mips64el: bool) -> u32 {
+        self.r_type(endian, is_mips64el)
+    }
+}

vendor/object/src/read/elf/segment.rs

@@ -0,0 +1,334 @@
+use core::fmt::Debug;
+use core::{mem, slice, str};
+
+use crate::elf;
+use crate::endian::{self, Endianness};
+use crate::pod::Pod;
+use crate::read::{self, Bytes, ObjectSegment, ReadError, ReadRef, SegmentFlags};
+
+use super::{ElfFile, FileHeader, NoteIterator};
+
+/// An iterator for the segments in an [`ElfFile32`](super::ElfFile32).
+pub type ElfSegmentIterator32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    ElfSegmentIterator<'data, 'file, elf::FileHeader32<Endian>, R>;
+/// An iterator for the segments in an [`ElfFile64`](super::ElfFile64).
+pub type ElfSegmentIterator64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    ElfSegmentIterator<'data, 'file, elf::FileHeader64<Endian>, R>;
+
+/// An iterator for the segments in an [`ElfFile`].
+#[derive(Debug)]
+pub struct ElfSegmentIterator<'data, 'file, Elf, R = &'data [u8]>
+where
+    Elf: FileHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) file: &'file ElfFile<'data, Elf, R>,
+    pub(super) iter: slice::Iter<'data, Elf::ProgramHeader>,
+}
+
+impl<'data, 'file, Elf, R> Iterator for ElfSegmentIterator<'data, 'file, Elf, R>
+where
+    Elf: FileHeader,
+    R: ReadRef<'data>,
+{
+    type Item = ElfSegment<'data, 'file, Elf, R>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        for segment in self.iter.by_ref() {
+            if segment.p_type(self.file.endian) == elf::PT_LOAD {
+                return Some(ElfSegment {
+                    file: self.file,
+                    segment,
+                });
+            }
+        }
+        None
+    }
+}
+
+/// A segment in an [`ElfFile32`](super::ElfFile32).
+pub type ElfSegment32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    ElfSegment<'data, 'file, elf::FileHeader32<Endian>, R>;
+/// A segment in an [`ElfFile64`](super::ElfFile64).
+pub type ElfSegment64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    ElfSegment<'data, 'file, elf::FileHeader64<Endian>, R>;
+
+/// A segment in an [`ElfFile`].
+///
+/// Most functionality is provided by the [`ObjectSegment`] trait implementation.
+#[derive(Debug)]
+pub struct ElfSegment<'data, 'file, Elf, R = &'data [u8]>
+where
+    Elf: FileHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) file: &'file ElfFile<'data, Elf, R>,
+    pub(super) segment: &'data Elf::ProgramHeader,
+}
+
+impl<'data, 'file, Elf: FileHeader, R: ReadRef<'data>> ElfSegment<'data, 'file, Elf, R> {
+    fn bytes(&self) -> read::Result<&'data [u8]> {
+        self.segment
+            .data(self.file.endian, self.file.data)
+            .read_error("Invalid ELF segment size or offset")
+    }
+}
+
+impl<'data, 'file, Elf, R> read::private::Sealed for ElfSegment<'data, 'file, Elf, R>
+where
+    Elf: FileHeader,
+    R: ReadRef<'data>,
+{
+}
+
+impl<'data, 'file, Elf, R> ObjectSegment<'data> for ElfSegment<'data, 'file, Elf, R>
+where
+    Elf: FileHeader,
+    R: ReadRef<'data>,
+{
+    #[inline]
+    fn address(&self) -> u64 {
+        self.segment.p_vaddr(self.file.endian).into()
+    }
+
+    #[inline]
+    fn size(&self) -> u64 {
+        self.segment.p_memsz(self.file.endian).into()
+    }
+
+    #[inline]
+    fn align(&self) -> u64 {
+        self.segment.p_align(self.file.endian).into()
+    }
+
+    #[inline]
+    fn file_range(&self) -> (u64, u64) {
+        self.segment.file_range(self.file.endian)
+    }
+
+    #[inline]
+    fn data(&self) -> read::Result<&'data [u8]> {
+        self.bytes()
+    }
+
+    fn data_range(&self, address: u64, size: u64) -> read::Result<Option<&'data [u8]>> {
+        Ok(read::util::data_range(
+            self.bytes()?,
+            self.address(),
+            address,
+            size,
+        ))
+    }
+
+    #[inline]
+    fn name_bytes(&self) -> read::Result<Option<&[u8]>> {
+        Ok(None)
+    }
+
+    #[inline]
+    fn name(&self) -> read::Result<Option<&str>> {
+        Ok(None)
+    }
+
+    #[inline]
+    fn flags(&self) -> SegmentFlags {
+        let p_flags = self.segment.p_flags(self.file.endian);
+        SegmentFlags::Elf { p_flags }
+    }
+}
+
+/// A trait for generic access to [`elf::ProgramHeader32`] and [`elf::ProgramHeader64`].
+#[allow(missing_docs)]
+pub trait ProgramHeader: Debug + Pod {
+    type Elf: FileHeader<ProgramHeader = Self, Endian = Self::Endian, Word = Self::Word>;
+    type Word: Into<u64>;
+    type Endian: endian::Endian;
+
+    fn p_type(&self, endian: Self::Endian) -> u32;
+    fn p_flags(&self, endian: Self::Endian) -> u32;
+    fn p_offset(&self, endian: Self::Endian) -> Self::Word;
+    fn p_vaddr(&self, endian: Self::Endian) -> Self::Word;
+    fn p_paddr(&self, endian: Self::Endian) -> Self::Word;
+    fn p_filesz(&self, endian: Self::Endian) -> Self::Word;
+    fn p_memsz(&self, endian: Self::Endian) -> Self::Word;
+    fn p_align(&self, endian: Self::Endian) -> Self::Word;
+
+    /// Return the offset and size of the segment in the file.
+    fn file_range(&self, endian: Self::Endian) -> (u64, u64) {
+        (self.p_offset(endian).into(), self.p_filesz(endian).into())
+    }
+
+    /// Return the segment data.
+    ///
+    /// Returns `Err` for invalid values.
+    fn data<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Self::Endian,
+        data: R,
+    ) -> Result<&'data [u8], ()> {
+        let (offset, size) = self.file_range(endian);
+        data.read_bytes_at(offset, size)
+    }
+
+    /// Return the segment data as a slice of the given type.
+    ///
+    /// Allows padding at the end of the data.
+    /// Returns `Ok(&[])` if the segment has no data.
+    /// Returns `Err` for invalid values, including bad alignment.
+    fn data_as_array<'data, T: Pod, R: ReadRef<'data>>(
+        &self,
+        endian: Self::Endian,
+        data: R,
+    ) -> Result<&'data [T], ()> {
+        let mut data = self.data(endian, data).map(Bytes)?;
+        data.read_slice(data.len() / mem::size_of::<T>())
+    }
+
+    /// Return the segment data in the given virtual address range
+    ///
+    /// Returns `Ok(None)` if the segment does not contain the address.
+    /// Returns `Err` for invalid values.
+    fn data_range<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Self::Endian,
+        data: R,
+        address: u64,
+        size: u64,
+    ) -> Result<Option<&'data [u8]>, ()> {
+        Ok(read::util::data_range(
+            self.data(endian, data)?,
+            self.p_vaddr(endian).into(),
+            address,
+            size,
+        ))
+    }
+
+    /// Return entries in a dynamic segment.
+    ///
+    /// Returns `Ok(None)` if the segment is not `PT_DYNAMIC`.
+    /// Returns `Err` for invalid values.
+    fn dynamic<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Self::Endian,
+        data: R,
+    ) -> read::Result<Option<&'data [<Self::Elf as FileHeader>::Dyn]>> {
+        if self.p_type(endian) != elf::PT_DYNAMIC {
+            return Ok(None);
+        }
+        let dynamic = self
+            .data_as_array(endian, data)
+            .read_error("Invalid ELF dynamic segment offset or size")?;
+        Ok(Some(dynamic))
+    }
+
+    /// Return a note iterator for the segment data.
+    ///
+    /// Returns `Ok(None)` if the segment does not contain notes.
+    /// Returns `Err` for invalid values.
+    fn notes<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Self::Endian,
+        data: R,
+    ) -> read::Result<Option<NoteIterator<'data, Self::Elf>>> {
+        if self.p_type(endian) != elf::PT_NOTE {
+            return Ok(None);
+        }
+        let data = self
+            .data(endian, data)
+            .read_error("Invalid ELF note segment offset or size")?;
+        let notes = NoteIterator::new(endian, self.p_align(endian), data)?;
+        Ok(Some(notes))
+    }
+}
+
+impl<Endian: endian::Endian> ProgramHeader for elf::ProgramHeader32<Endian> {
+    type Word = u32;
+    type Endian = Endian;
+    type Elf = elf::FileHeader32<Endian>;
+
+    #[inline]
+    fn p_type(&self, endian: Self::Endian) -> u32 {
+        self.p_type.get(endian)
+    }
+
+    #[inline]
+    fn p_flags(&self, endian: Self::Endian) -> u32 {
+        self.p_flags.get(endian)
+    }
+
+    #[inline]
+    fn p_offset(&self, endian: Self::Endian) -> Self::Word {
+        self.p_offset.get(endian)
+    }
+
+    #[inline]
+    fn p_vaddr(&self, endian: Self::Endian) -> Self::Word {
+        self.p_vaddr.get(endian)
+    }
+
+    #[inline]
+    fn p_paddr(&self, endian: Self::Endian) -> Self::Word {
+        self.p_paddr.get(endian)
+    }
+
+    #[inline]
+    fn p_filesz(&self, endian: Self::Endian) -> Self::Word {
+        self.p_filesz.get(endian)
+    }
+
+    #[inline]
+    fn p_memsz(&self, endian: Self::Endian) -> Self::Word {
+        self.p_memsz.get(endian)
+    }
+
+    #[inline]
+    fn p_align(&self, endian: Self::Endian) -> Self::Word {
+        self.p_align.get(endian)
+    }
+}
+
+impl<Endian: endian::Endian> ProgramHeader for elf::ProgramHeader64<Endian> {
+    type Word = u64;
+    type Endian = Endian;
+    type Elf = elf::FileHeader64<Endian>;
+
+    #[inline]
+    fn p_type(&self, endian: Self::Endian) -> u32 {
+        self.p_type.get(endian)
+    }
+
+    #[inline]
+    fn p_flags(&self, endian: Self::Endian) -> u32 {
+        self.p_flags.get(endian)
+    }
+
+    #[inline]
+    fn p_offset(&self, endian: Self::Endian) -> Self::Word {
+        self.p_offset.get(endian)
+    }
+
+    #[inline]
+    fn p_vaddr(&self, endian: Self::Endian) -> Self::Word {
+        self.p_vaddr.get(endian)
+    }
+
+    #[inline]
+    fn p_paddr(&self, endian: Self::Endian) -> Self::Word {
+        self.p_paddr.get(endian)
+    }
+
+    #[inline]
+    fn p_filesz(&self, endian: Self::Endian) -> Self::Word {
+        self.p_filesz.get(endian)
+    }
+
+    #[inline]
+    fn p_memsz(&self, endian: Self::Endian) -> Self::Word {
+        self.p_memsz.get(endian)
+    }
+
+    #[inline]
+    fn p_align(&self, endian: Self::Endian) -> Self::Word {
+        self.p_align.get(endian)
+    }
+}

vendor/object/src/read/elf/symbol.rs

@@ -0,0 +1,595 @@
+use alloc::fmt;
+use alloc::vec::Vec;
+use core::fmt::Debug;
+use core::slice;
+use core::str;
+
+use crate::endian::{self, Endianness};
+use crate::pod::Pod;
+use crate::read::util::StringTable;
+use crate::read::{
+    self, ObjectSymbol, ObjectSymbolTable, ReadError, ReadRef, SectionIndex, SymbolFlags,
+    SymbolIndex, SymbolKind, SymbolMap, SymbolMapEntry, SymbolScope, SymbolSection,
+};
+use crate::{elf, U32};
+
+use super::{FileHeader, SectionHeader, SectionTable};
+
+/// A table of symbol entries in an ELF file.
+///
+/// Also includes the string table used for the symbol names.
+///
+/// Returned by [`SectionTable::symbols`].
+#[derive(Debug, Clone, Copy)]
+pub struct SymbolTable<'data, Elf: FileHeader, R = &'data [u8]>
+where
+    R: ReadRef<'data>,
+{
+    section: SectionIndex,
+    string_section: SectionIndex,
+    shndx_section: SectionIndex,
+    symbols: &'data [Elf::Sym],
+    strings: StringTable<'data, R>,
+    shndx: &'data [U32<Elf::Endian>],
+}
+
+impl<'data, Elf: FileHeader, R: ReadRef<'data>> Default for SymbolTable<'data, Elf, R> {
+    fn default() -> Self {
+        SymbolTable {
+            section: SectionIndex(0),
+            string_section: SectionIndex(0),
+            shndx_section: SectionIndex(0),
+            symbols: &[],
+            strings: Default::default(),
+            shndx: &[],
+        }
+    }
+}
+
+impl<'data, Elf: FileHeader, R: ReadRef<'data>> SymbolTable<'data, Elf, R> {
+    /// Parse the given symbol table section.
+    pub fn parse(
+        endian: Elf::Endian,
+        data: R,
+        sections: &SectionTable<'data, Elf, R>,
+        section_index: SectionIndex,
+        section: &Elf::SectionHeader,
+    ) -> read::Result<SymbolTable<'data, Elf, R>> {
+        debug_assert!(
+            section.sh_type(endian) == elf::SHT_DYNSYM
+                || section.sh_type(endian) == elf::SHT_SYMTAB
+        );
+
+        let symbols = section
+            .data_as_array(endian, data)
+            .read_error("Invalid ELF symbol table data")?;
+
+        let link = SectionIndex(section.sh_link(endian) as usize);
+        let strings = sections.strings(endian, data, link)?;
+
+        let mut shndx_section = SectionIndex(0);
+        let mut shndx = &[][..];
+        for (i, s) in sections.iter().enumerate() {
+            if s.sh_type(endian) == elf::SHT_SYMTAB_SHNDX
+                && s.sh_link(endian) as usize == section_index.0
+            {
+                shndx_section = SectionIndex(i);
+                shndx = s
+                    .data_as_array(endian, data)
+                    .read_error("Invalid ELF symtab_shndx data")?;
+            }
+        }
+
+        Ok(SymbolTable {
+            section: section_index,
+            string_section: link,
+            symbols,
+            strings,
+            shndx,
+            shndx_section,
+        })
+    }
+
+    /// Return the section index of this symbol table.
+    #[inline]
+    pub fn section(&self) -> SectionIndex {
+        self.section
+    }
+
+    /// Return the section index of the shndx table.
+    #[inline]
+    pub fn shndx_section(&self) -> SectionIndex {
+        self.shndx_section
+    }
+
+    /// Return the section index of the linked string table.
+    #[inline]
+    pub fn string_section(&self) -> SectionIndex {
+        self.string_section
+    }
+
+    /// Return the string table used for the symbol names.
+    #[inline]
+    pub fn strings(&self) -> StringTable<'data, R> {
+        self.strings
+    }
+
+    /// Return the symbol table.
+    #[inline]
+    pub fn symbols(&self) -> &'data [Elf::Sym] {
+        self.symbols
+    }
+
+    /// Iterate over the symbols.
+    #[inline]
+    pub fn iter(&self) -> slice::Iter<'data, Elf::Sym> {
+        self.symbols.iter()
+    }
+
+    /// Return true if the symbol table is empty.
+    #[inline]
+    pub fn is_empty(&self) -> bool {
+        self.symbols.is_empty()
+    }
+
+    /// The number of symbols.
+    #[inline]
+    pub fn len(&self) -> usize {
+        self.symbols.len()
+    }
+
+    /// Return the symbol at the given index.
+    pub fn symbol(&self, index: usize) -> read::Result<&'data Elf::Sym> {
+        self.symbols
+            .get(index)
+            .read_error("Invalid ELF symbol index")
+    }
+
+    /// Return the extended section index for the given symbol if present.
+    #[inline]
+    pub fn shndx(&self, endian: Elf::Endian, index: usize) -> Option<u32> {
+        self.shndx.get(index).map(|x| x.get(endian))
+    }
+
+    /// Return the section index for the given symbol.
+    ///
+    /// This uses the extended section index if present.
+    pub fn symbol_section(
+        &self,
+        endian: Elf::Endian,
+        symbol: &'data Elf::Sym,
+        index: usize,
+    ) -> read::Result<Option<SectionIndex>> {
+        match symbol.st_shndx(endian) {
+            elf::SHN_UNDEF => Ok(None),
+            elf::SHN_XINDEX => self
+                .shndx(endian, index)
+                .read_error("Missing ELF symbol extended index")
+                .map(|index| Some(SectionIndex(index as usize))),
+            shndx if shndx < elf::SHN_LORESERVE => Ok(Some(SectionIndex(shndx.into()))),
+            _ => Ok(None),
+        }
+    }
+
+    /// Return the symbol name for the given symbol.
+    pub fn symbol_name(
+        &self,
+        endian: Elf::Endian,
+        symbol: &'data Elf::Sym,
+    ) -> read::Result<&'data [u8]> {
+        symbol.name(endian, self.strings)
+    }
+
+    /// Construct a map from addresses to a user-defined map entry.
+    pub fn map<Entry: SymbolMapEntry, F: Fn(&'data Elf::Sym) -> Option<Entry>>(
+        &self,
+        endian: Elf::Endian,
+        f: F,
+    ) -> SymbolMap<Entry> {
+        let mut symbols = Vec::with_capacity(self.symbols.len());
+        for symbol in self.symbols {
+            if !symbol.is_definition(endian) {
+                continue;
+            }
+            if let Some(entry) = f(symbol) {
+                symbols.push(entry);
+            }
+        }
+        SymbolMap::new(symbols)
+    }
+}
+
+/// A symbol table in an [`ElfFile32`](super::ElfFile32).
+pub type ElfSymbolTable32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    ElfSymbolTable<'data, 'file, elf::FileHeader32<Endian>, R>;
+/// A symbol table in an [`ElfFile32`](super::ElfFile32).
+pub type ElfSymbolTable64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    ElfSymbolTable<'data, 'file, elf::FileHeader64<Endian>, R>;
+
+/// A symbol table in an [`ElfFile`](super::ElfFile).
+#[derive(Debug, Clone, Copy)]
+pub struct ElfSymbolTable<'data, 'file, Elf, R = &'data [u8]>
+where
+    Elf: FileHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) endian: Elf::Endian,
+    pub(super) symbols: &'file SymbolTable<'data, Elf, R>,
+}
+
+impl<'data, 'file, Elf: FileHeader, R: ReadRef<'data>> read::private::Sealed
+    for ElfSymbolTable<'data, 'file, Elf, R>
+{
+}
+
+impl<'data, 'file, Elf: FileHeader, R: ReadRef<'data>> ObjectSymbolTable<'data>
+    for ElfSymbolTable<'data, 'file, Elf, R>
+{
+    type Symbol = ElfSymbol<'data, 'file, Elf, R>;
+    type SymbolIterator = ElfSymbolIterator<'data, 'file, Elf, R>;
+
+    fn symbols(&self) -> Self::SymbolIterator {
+        ElfSymbolIterator {
+            endian: self.endian,
+            symbols: self.symbols,
+            index: 0,
+        }
+    }
+
+    fn symbol_by_index(&self, index: SymbolIndex) -> read::Result<Self::Symbol> {
+        let symbol = self.symbols.symbol(index.0)?;
+        Ok(ElfSymbol {
+            endian: self.endian,
+            symbols: self.symbols,
+            index,
+            symbol,
+        })
+    }
+}
+
+/// An iterator for the symbols in an [`ElfFile32`](super::ElfFile32).
+pub type ElfSymbolIterator32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    ElfSymbolIterator<'data, 'file, elf::FileHeader32<Endian>, R>;
+/// An iterator for the symbols in an [`ElfFile64`](super::ElfFile64).
+pub type ElfSymbolIterator64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    ElfSymbolIterator<'data, 'file, elf::FileHeader64<Endian>, R>;
+
+/// An iterator for the symbols in an [`ElfFile`](super::ElfFile).
+pub struct ElfSymbolIterator<'data, 'file, Elf, R = &'data [u8]>
+where
+    Elf: FileHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) endian: Elf::Endian,
+    pub(super) symbols: &'file SymbolTable<'data, Elf, R>,
+    pub(super) index: usize,
+}
+
+impl<'data, 'file, Elf: FileHeader, R: ReadRef<'data>> fmt::Debug
+    for ElfSymbolIterator<'data, 'file, Elf, R>
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("ElfSymbolIterator").finish()
+    }
+}
+
+impl<'data, 'file, Elf: FileHeader, R: ReadRef<'data>> Iterator
+    for ElfSymbolIterator<'data, 'file, Elf, R>
+{
+    type Item = ElfSymbol<'data, 'file, Elf, R>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let index = self.index;
+        let symbol = self.symbols.symbols.get(index)?;
+        self.index += 1;
+        Some(ElfSymbol {
+            endian: self.endian,
+            symbols: self.symbols,
+            index: SymbolIndex(index),
+            symbol,
+        })
+    }
+}
+
+/// A symbol in an [`ElfFile32`](super::ElfFile32).
+pub type ElfSymbol32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    ElfSymbol<'data, 'file, elf::FileHeader32<Endian>, R>;
+/// A symbol in an [`ElfFile64`](super::ElfFile64).
+pub type ElfSymbol64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    ElfSymbol<'data, 'file, elf::FileHeader64<Endian>, R>;
+
+/// A symbol in an [`ElfFile`](super::ElfFile).
+///
+/// Most functionality is provided by the [`ObjectSymbol`] trait implementation.
+#[derive(Debug, Clone, Copy)]
+pub struct ElfSymbol<'data, 'file, Elf, R = &'data [u8]>
+where
+    Elf: FileHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) endian: Elf::Endian,
+    pub(super) symbols: &'file SymbolTable<'data, Elf, R>,
+    pub(super) index: SymbolIndex,
+    pub(super) symbol: &'data Elf::Sym,
+}
+
+impl<'data, 'file, Elf: FileHeader, R: ReadRef<'data>> ElfSymbol<'data, 'file, Elf, R> {
+    /// Return a reference to the raw symbol structure.
+    #[inline]
+    pub fn raw_symbol(&self) -> &'data Elf::Sym {
+        self.symbol
+    }
+}
+
+impl<'data, 'file, Elf: FileHeader, R: ReadRef<'data>> read::private::Sealed
+    for ElfSymbol<'data, 'file, Elf, R>
+{
+}
+
+impl<'data, 'file, Elf: FileHeader, R: ReadRef<'data>> ObjectSymbol<'data>
+    for ElfSymbol<'data, 'file, Elf, R>
+{
+    #[inline]
+    fn index(&self) -> SymbolIndex {
+        self.index
+    }
+
+    fn name_bytes(&self) -> read::Result<&'data [u8]> {
+        self.symbol.name(self.endian, self.symbols.strings())
+    }
+
+    fn name(&self) -> read::Result<&'data str> {
+        let name = self.name_bytes()?;
+        str::from_utf8(name)
+            .ok()
+            .read_error("Non UTF-8 ELF symbol name")
+    }
+
+    #[inline]
+    fn address(&self) -> u64 {
+        self.symbol.st_value(self.endian).into()
+    }
+
+    #[inline]
+    fn size(&self) -> u64 {
+        self.symbol.st_size(self.endian).into()
+    }
+
+    fn kind(&self) -> SymbolKind {
+        match self.symbol.st_type() {
+            elf::STT_NOTYPE if self.index.0 == 0 => SymbolKind::Null,
+            elf::STT_NOTYPE => SymbolKind::Unknown,
+            elf::STT_OBJECT | elf::STT_COMMON => SymbolKind::Data,
+            elf::STT_FUNC | elf::STT_GNU_IFUNC => SymbolKind::Text,
+            elf::STT_SECTION => SymbolKind::Section,
+            elf::STT_FILE => SymbolKind::File,
+            elf::STT_TLS => SymbolKind::Tls,
+            _ => SymbolKind::Unknown,
+        }
+    }
+
+    fn section(&self) -> SymbolSection {
+        match self.symbol.st_shndx(self.endian) {
+            elf::SHN_UNDEF => SymbolSection::Undefined,
+            elf::SHN_ABS => {
+                if self.symbol.st_type() == elf::STT_FILE {
+                    SymbolSection::None
+                } else {
+                    SymbolSection::Absolute
+                }
+            }
+            elf::SHN_COMMON => SymbolSection::Common,
+            elf::SHN_XINDEX => match self.symbols.shndx(self.endian, self.index.0) {
+                Some(index) => SymbolSection::Section(SectionIndex(index as usize)),
+                None => SymbolSection::Unknown,
+            },
+            index if index < elf::SHN_LORESERVE => {
+                SymbolSection::Section(SectionIndex(index as usize))
+            }
+            _ => SymbolSection::Unknown,
+        }
+    }
+
+    #[inline]
+    fn is_undefined(&self) -> bool {
+        self.symbol.st_shndx(self.endian) == elf::SHN_UNDEF
+    }
+
+    #[inline]
+    fn is_definition(&self) -> bool {
+        self.symbol.is_definition(self.endian)
+    }
+
+    #[inline]
+    fn is_common(&self) -> bool {
+        self.symbol.st_shndx(self.endian) == elf::SHN_COMMON
+    }
+
+    #[inline]
+    fn is_weak(&self) -> bool {
+        self.symbol.st_bind() == elf::STB_WEAK
+    }
+
+    fn scope(&self) -> SymbolScope {
+        if self.symbol.st_shndx(self.endian) == elf::SHN_UNDEF {
+            SymbolScope::Unknown
+        } else {
+            match self.symbol.st_bind() {
+                elf::STB_LOCAL => SymbolScope::Compilation,
+                elf::STB_GLOBAL | elf::STB_WEAK => {
+                    if self.symbol.st_visibility() == elf::STV_HIDDEN {
+                        SymbolScope::Linkage
+                    } else {
+                        SymbolScope::Dynamic
+                    }
+                }
+                _ => SymbolScope::Unknown,
+            }
+        }
+    }
+
+    #[inline]
+    fn is_global(&self) -> bool {
+        self.symbol.st_bind() != elf::STB_LOCAL
+    }
+
+    #[inline]
+    fn is_local(&self) -> bool {
+        self.symbol.st_bind() == elf::STB_LOCAL
+    }
+
+    #[inline]
+    fn flags(&self) -> SymbolFlags<SectionIndex, SymbolIndex> {
+        SymbolFlags::Elf {
+            st_info: self.symbol.st_info(),
+            st_other: self.symbol.st_other(),
+        }
+    }
+}
+
+/// A trait for generic access to [`elf::Sym32`] and [`elf::Sym64`].
+#[allow(missing_docs)]
+pub trait Sym: Debug + Pod {
+    type Word: Into<u64>;
+    type Endian: endian::Endian;
+
+    fn st_name(&self, endian: Self::Endian) -> u32;
+    fn st_info(&self) -> u8;
+    fn st_bind(&self) -> u8;
+    fn st_type(&self) -> u8;
+    fn st_other(&self) -> u8;
+    fn st_visibility(&self) -> u8;
+    fn st_shndx(&self, endian: Self::Endian) -> u16;
+    fn st_value(&self, endian: Self::Endian) -> Self::Word;
+    fn st_size(&self, endian: Self::Endian) -> Self::Word;
+
+    /// Parse the symbol name from the string table.
+    fn name<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Self::Endian,
+        strings: StringTable<'data, R>,
+    ) -> read::Result<&'data [u8]> {
+        strings
+            .get(self.st_name(endian))
+            .read_error("Invalid ELF symbol name offset")
+    }
+
+    /// Return true if the symbol is undefined.
+    #[inline]
+    fn is_undefined(&self, endian: Self::Endian) -> bool {
+        self.st_shndx(endian) == elf::SHN_UNDEF
+    }
+
+    /// Return true if the symbol is a definition of a function or data object.
+    fn is_definition(&self, endian: Self::Endian) -> bool {
+        let shndx = self.st_shndx(endian);
+        if shndx == elf::SHN_UNDEF || (shndx >= elf::SHN_LORESERVE && shndx != elf::SHN_XINDEX) {
+            return false;
+        }
+        match self.st_type() {
+            elf::STT_NOTYPE => self.st_size(endian).into() != 0,
+            elf::STT_FUNC | elf::STT_OBJECT => true,
+            _ => false,
+        }
+    }
+}
+
+impl<Endian: endian::Endian> Sym for elf::Sym32<Endian> {
+    type Word = u32;
+    type Endian = Endian;
+
+    #[inline]
+    fn st_name(&self, endian: Self::Endian) -> u32 {
+        self.st_name.get(endian)
+    }
+
+    #[inline]
+    fn st_info(&self) -> u8 {
+        self.st_info
+    }
+
+    #[inline]
+    fn st_bind(&self) -> u8 {
+        self.st_bind()
+    }
+
+    #[inline]
+    fn st_type(&self) -> u8 {
+        self.st_type()
+    }
+
+    #[inline]
+    fn st_other(&self) -> u8 {
+        self.st_other
+    }
+
+    #[inline]
+    fn st_visibility(&self) -> u8 {
+        self.st_visibility()
+    }
+
+    #[inline]
+    fn st_shndx(&self, endian: Self::Endian) -> u16 {
+        self.st_shndx.get(endian)
+    }
+
+    #[inline]
+    fn st_value(&self, endian: Self::Endian) -> Self::Word {
+        self.st_value.get(endian)
+    }
+
+    #[inline]
+    fn st_size(&self, endian: Self::Endian) -> Self::Word {
+        self.st_size.get(endian)
+    }
+}
+
+impl<Endian: endian::Endian> Sym for elf::Sym64<Endian> {
+    type Word = u64;
+    type Endian = Endian;
+
+    #[inline]
+    fn st_name(&self, endian: Self::Endian) -> u32 {
+        self.st_name.get(endian)
+    }
+
+    #[inline]
+    fn st_info(&self) -> u8 {
+        self.st_info
+    }
+
+    #[inline]
+    fn st_bind(&self) -> u8 {
+        self.st_bind()
+    }
+
+    #[inline]
+    fn st_type(&self) -> u8 {
+        self.st_type()
+    }
+
+    #[inline]
+    fn st_other(&self) -> u8 {
+        self.st_other
+    }
+
+    #[inline]
+    fn st_visibility(&self) -> u8 {
+        self.st_visibility()
+    }
+
+    #[inline]
+    fn st_shndx(&self, endian: Self::Endian) -> u16 {
+        self.st_shndx.get(endian)
+    }
+
+    #[inline]
+    fn st_value(&self, endian: Self::Endian) -> Self::Word {
+        self.st_value.get(endian)
+    }
+
+    #[inline]
+    fn st_size(&self, endian: Self::Endian) -> Self::Word {
+        self.st_size.get(endian)
+    }
+}

vendor/object/src/read/elf/version.rs

@@ -0,0 +1,424 @@
+use alloc::vec::Vec;
+
+use crate::read::{Bytes, ReadError, ReadRef, Result, StringTable};
+use crate::{elf, endian};
+
+use super::FileHeader;
+
+/// A version index.
+#[derive(Debug, Default, Clone, Copy)]
+pub struct VersionIndex(pub u16);
+
+impl VersionIndex {
+    /// Return the version index.
+    pub fn index(&self) -> u16 {
+        self.0 & elf::VERSYM_VERSION
+    }
+
+    /// Return true if it is the local index.
+    pub fn is_local(&self) -> bool {
+        self.index() == elf::VER_NDX_LOCAL
+    }
+
+    /// Return true if it is the global index.
+    pub fn is_global(&self) -> bool {
+        self.index() == elf::VER_NDX_GLOBAL
+    }
+
+    /// Return the hidden flag.
+    pub fn is_hidden(&self) -> bool {
+        self.0 & elf::VERSYM_HIDDEN != 0
+    }
+}
+
+/// A version definition or requirement.
+///
+/// This is derived from entries in the [`elf::SHT_GNU_VERDEF`] and [`elf::SHT_GNU_VERNEED`] sections.
+#[derive(Debug, Default, Clone, Copy)]
+pub struct Version<'data> {
+    name: &'data [u8],
+    hash: u32,
+    // Used to keep track of valid indices in `VersionTable`.
+    valid: bool,
+}
+
+impl<'data> Version<'data> {
+    /// Return the version name.
+    pub fn name(&self) -> &'data [u8] {
+        self.name
+    }
+
+    /// Return hash of the version name.
+    pub fn hash(&self) -> u32 {
+        self.hash
+    }
+}
+
+/// A table of version definitions and requirements.
+///
+/// It allows looking up the version information for a given symbol index.
+///
+/// This is derived from entries in the [`elf::SHT_GNU_VERSYM`], [`elf::SHT_GNU_VERDEF`]
+/// and [`elf::SHT_GNU_VERNEED`] sections.
+///
+/// Returned by [`SectionTable::versions`](super::SectionTable::versions).
+#[derive(Debug, Clone)]
+pub struct VersionTable<'data, Elf: FileHeader> {
+    symbols: &'data [elf::Versym<Elf::Endian>],
+    versions: Vec<Version<'data>>,
+}
+
+impl<'data, Elf: FileHeader> Default for VersionTable<'data, Elf> {
+    fn default() -> Self {
+        VersionTable {
+            symbols: &[],
+            versions: Vec::new(),
+        }
+    }
+}
+
+impl<'data, Elf: FileHeader> VersionTable<'data, Elf> {
+    /// Parse the version sections.
+    pub fn parse<R: ReadRef<'data>>(
+        endian: Elf::Endian,
+        versyms: &'data [elf::Versym<Elf::Endian>],
+        verdefs: Option<VerdefIterator<'data, Elf>>,
+        verneeds: Option<VerneedIterator<'data, Elf>>,
+        strings: StringTable<'data, R>,
+    ) -> Result<Self> {
+        let mut max_index = 0;
+        if let Some(mut verdefs) = verdefs.clone() {
+            while let Some((verdef, _)) = verdefs.next()? {
+                if verdef.vd_flags.get(endian) & elf::VER_FLG_BASE != 0 {
+                    continue;
+                }
+                let index = verdef.vd_ndx.get(endian) & elf::VERSYM_VERSION;
+                if max_index < index {
+                    max_index = index;
+                }
+            }
+        }
+        if let Some(mut verneeds) = verneeds.clone() {
+            while let Some((_, mut vernauxs)) = verneeds.next()? {
+                while let Some(vernaux) = vernauxs.next()? {
+                    let index = vernaux.vna_other.get(endian) & elf::VERSYM_VERSION;
+                    if max_index < index {
+                        max_index = index;
+                    }
+                }
+            }
+        }
+
+        // Indices should be sequential, but this could be up to
+        // 32k * size_of::<Version>() if max_index is bad.
+        let mut versions = vec![Version::default(); max_index as usize + 1];
+
+        if let Some(mut verdefs) = verdefs {
+            while let Some((verdef, mut verdauxs)) = verdefs.next()? {
+                if verdef.vd_flags.get(endian) & elf::VER_FLG_BASE != 0 {
+                    continue;
+                }
+                let index = verdef.vd_ndx.get(endian) & elf::VERSYM_VERSION;
+                if index <= elf::VER_NDX_GLOBAL {
+                    // TODO: return error?
+                    continue;
+                }
+                if let Some(verdaux) = verdauxs.next()? {
+                    versions[usize::from(index)] = Version {
+                        name: verdaux.name(endian, strings)?,
+                        hash: verdef.vd_hash.get(endian),
+                        valid: true,
+                    };
+                }
+            }
+        }
+        if let Some(mut verneeds) = verneeds {
+            while let Some((_, mut vernauxs)) = verneeds.next()? {
+                while let Some(vernaux) = vernauxs.next()? {
+                    let index = vernaux.vna_other.get(endian) & elf::VERSYM_VERSION;
+                    if index <= elf::VER_NDX_GLOBAL {
+                        // TODO: return error?
+                        continue;
+                    }
+                    versions[usize::from(index)] = Version {
+                        name: vernaux.name(endian, strings)?,
+                        hash: vernaux.vna_hash.get(endian),
+                        valid: true,
+                    };
+                }
+            }
+        }
+
+        Ok(VersionTable {
+            symbols: versyms,
+            versions,
+        })
+    }
+
+    /// Return true if the version table is empty.
+    pub fn is_empty(&self) -> bool {
+        self.symbols.is_empty()
+    }
+
+    /// Return version index for a given symbol index.
+    pub fn version_index(&self, endian: Elf::Endian, index: usize) -> VersionIndex {
+        let version_index = match self.symbols.get(index) {
+            Some(x) => x.0.get(endian),
+            // Ideally this would be VER_NDX_LOCAL for undefined symbols,
+            // but currently there are no checks that need this distinction.
+            None => elf::VER_NDX_GLOBAL,
+        };
+        VersionIndex(version_index)
+    }
+
+    /// Return version information for a given symbol version index.
+    ///
+    /// Returns `Ok(None)` for local and global versions.
+    /// Returns `Err(_)` if index is invalid.
+    pub fn version(&self, index: VersionIndex) -> Result<Option<&Version<'data>>> {
+        if index.index() <= elf::VER_NDX_GLOBAL {
+            return Ok(None);
+        }
+        self.versions
+            .get(usize::from(index.index()))
+            .filter(|version| version.valid)
+            .read_error("Invalid ELF symbol version index")
+            .map(Some)
+    }
+
+    /// Return true if the given symbol index satisfies the requirements of `need`.
+    ///
+    /// Returns false for any error.
+    ///
+    /// Note: this function hasn't been fully tested and is likely to be incomplete.
+    pub fn matches(&self, endian: Elf::Endian, index: usize, need: Option<&Version<'_>>) -> bool {
+        let version_index = self.version_index(endian, index);
+        let def = match self.version(version_index) {
+            Ok(def) => def,
+            Err(_) => return false,
+        };
+        match (def, need) {
+            (Some(def), Some(need)) => need.hash == def.hash && need.name == def.name,
+            (None, Some(_need)) => {
+                // Version must be present if needed.
+                false
+            }
+            (Some(_def), None) => {
+                // For a dlsym call, use the newest version.
+                // TODO: if not a dlsym call, then use the oldest version.
+                !version_index.is_hidden()
+            }
+            (None, None) => true,
+        }
+    }
+}
+
+/// An iterator for the entries in an ELF [`elf::SHT_GNU_VERDEF`] section.
+#[derive(Debug, Clone)]
+pub struct VerdefIterator<'data, Elf: FileHeader> {
+    endian: Elf::Endian,
+    data: Bytes<'data>,
+}
+
+impl<'data, Elf: FileHeader> VerdefIterator<'data, Elf> {
+    pub(super) fn new(endian: Elf::Endian, data: &'data [u8]) -> Self {
+        VerdefIterator {
+            endian,
+            data: Bytes(data),
+        }
+    }
+
+    /// Return the next `Verdef` entry.
+    pub fn next(
+        &mut self,
+    ) -> Result<Option<(&'data elf::Verdef<Elf::Endian>, VerdauxIterator<'data, Elf>)>> {
+        if self.data.is_empty() {
+            return Ok(None);
+        }
+
+        let verdef = self
+            .data
+            .read_at::<elf::Verdef<_>>(0)
+            .read_error("ELF verdef is too short")?;
+
+        let mut verdaux_data = self.data;
+        verdaux_data
+            .skip(verdef.vd_aux.get(self.endian) as usize)
+            .read_error("Invalid ELF vd_aux")?;
+        let verdaux =
+            VerdauxIterator::new(self.endian, verdaux_data.0, verdef.vd_cnt.get(self.endian));
+
+        let next = verdef.vd_next.get(self.endian);
+        if next != 0 {
+            self.data
+                .skip(next as usize)
+                .read_error("Invalid ELF vd_next")?;
+        } else {
+            self.data = Bytes(&[]);
+        }
+        Ok(Some((verdef, verdaux)))
+    }
+}
+
+/// An iterator for the auxiliary records for an entry in an ELF [`elf::SHT_GNU_VERDEF`] section.
+#[derive(Debug, Clone)]
+pub struct VerdauxIterator<'data, Elf: FileHeader> {
+    endian: Elf::Endian,
+    data: Bytes<'data>,
+    count: u16,
+}
+
+impl<'data, Elf: FileHeader> VerdauxIterator<'data, Elf> {
+    pub(super) fn new(endian: Elf::Endian, data: &'data [u8], count: u16) -> Self {
+        VerdauxIterator {
+            endian,
+            data: Bytes(data),
+            count,
+        }
+    }
+
+    /// Return the next `Verdaux` entry.
+    pub fn next(&mut self) -> Result<Option<&'data elf::Verdaux<Elf::Endian>>> {
+        if self.count == 0 {
+            return Ok(None);
+        }
+
+        let verdaux = self
+            .data
+            .read_at::<elf::Verdaux<_>>(0)
+            .read_error("ELF verdaux is too short")?;
+
+        self.data
+            .skip(verdaux.vda_next.get(self.endian) as usize)
+            .read_error("Invalid ELF vda_next")?;
+        self.count -= 1;
+        Ok(Some(verdaux))
+    }
+}
+
+/// An iterator for the entries in an ELF [`elf::SHT_GNU_VERNEED`] section.
+#[derive(Debug, Clone)]
+pub struct VerneedIterator<'data, Elf: FileHeader> {
+    endian: Elf::Endian,
+    data: Bytes<'data>,
+}
+
+impl<'data, Elf: FileHeader> VerneedIterator<'data, Elf> {
+    pub(super) fn new(endian: Elf::Endian, data: &'data [u8]) -> Self {
+        VerneedIterator {
+            endian,
+            data: Bytes(data),
+        }
+    }
+
+    /// Return the next `Verneed` entry.
+    pub fn next(
+        &mut self,
+    ) -> Result<
+        Option<(
+            &'data elf::Verneed<Elf::Endian>,
+            VernauxIterator<'data, Elf>,
+        )>,
+    > {
+        if self.data.is_empty() {
+            return Ok(None);
+        }
+
+        let verneed = self
+            .data
+            .read_at::<elf::Verneed<_>>(0)
+            .read_error("ELF verneed is too short")?;
+
+        let mut vernaux_data = self.data;
+        vernaux_data
+            .skip(verneed.vn_aux.get(self.endian) as usize)
+            .read_error("Invalid ELF vn_aux")?;
+        let vernaux =
+            VernauxIterator::new(self.endian, vernaux_data.0, verneed.vn_cnt.get(self.endian));
+
+        let next = verneed.vn_next.get(self.endian);
+        if next != 0 {
+            self.data
+                .skip(next as usize)
+                .read_error("Invalid ELF vn_next")?;
+        } else {
+            self.data = Bytes(&[]);
+        }
+        Ok(Some((verneed, vernaux)))
+    }
+}
+
+/// An iterator for the auxiliary records for an entry in an ELF [`elf::SHT_GNU_VERNEED`] section.
+#[derive(Debug, Clone)]
+pub struct VernauxIterator<'data, Elf: FileHeader> {
+    endian: Elf::Endian,
+    data: Bytes<'data>,
+    count: u16,
+}
+
+impl<'data, Elf: FileHeader> VernauxIterator<'data, Elf> {
+    pub(super) fn new(endian: Elf::Endian, data: &'data [u8], count: u16) -> Self {
+        VernauxIterator {
+            endian,
+            data: Bytes(data),
+            count,
+        }
+    }
+
+    /// Return the next `Vernaux` entry.
+    pub fn next(&mut self) -> Result<Option<&'data elf::Vernaux<Elf::Endian>>> {
+        if self.count == 0 {
+            return Ok(None);
+        }
+
+        let vernaux = self
+            .data
+            .read_at::<elf::Vernaux<_>>(0)
+            .read_error("ELF vernaux is too short")?;
+
+        self.data
+            .skip(vernaux.vna_next.get(self.endian) as usize)
+            .read_error("Invalid ELF vna_next")?;
+        self.count -= 1;
+        Ok(Some(vernaux))
+    }
+}
+
+impl<Endian: endian::Endian> elf::Verdaux<Endian> {
+    /// Parse the version name from the string table.
+    pub fn name<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Endian,
+        strings: StringTable<'data, R>,
+    ) -> Result<&'data [u8]> {
+        strings
+            .get(self.vda_name.get(endian))
+            .read_error("Invalid ELF vda_name")
+    }
+}
+
+impl<Endian: endian::Endian> elf::Verneed<Endian> {
+    /// Parse the file from the string table.
+    pub fn file<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Endian,
+        strings: StringTable<'data, R>,
+    ) -> Result<&'data [u8]> {
+        strings
+            .get(self.vn_file.get(endian))
+            .read_error("Invalid ELF vn_file")
+    }
+}
+
+impl<Endian: endian::Endian> elf::Vernaux<Endian> {
+    /// Parse the version name from the string table.
+    pub fn name<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Endian,
+        strings: StringTable<'data, R>,
+    ) -> Result<&'data [u8]> {
+        strings
+            .get(self.vna_name.get(endian))
+            .read_error("Invalid ELF vna_name")
+    }
+}

vendor/object/src/read/macho/dyld_cache.rs

@@ -0,0 +1,344 @@
+use alloc::vec::Vec;
+use core::slice;
+
+use crate::read::{Error, File, ReadError, ReadRef, Result};
+use crate::{macho, Architecture, Endian, Endianness};
+
+/// A parsed representation of the dyld shared cache.
+#[derive(Debug)]
+pub struct DyldCache<'data, E = Endianness, R = &'data [u8]>
+where
+    E: Endian,
+    R: ReadRef<'data>,
+{
+    endian: E,
+    data: R,
+    subcaches: Vec<DyldSubCache<'data, E, R>>,
+    mappings: &'data [macho::DyldCacheMappingInfo<E>],
+    images: &'data [macho::DyldCacheImageInfo<E>],
+    arch: Architecture,
+}
+
+/// Information about a subcache.
+#[derive(Debug)]
+pub struct DyldSubCache<'data, E = Endianness, R = &'data [u8]>
+where
+    E: Endian,
+    R: ReadRef<'data>,
+{
+    data: R,
+    mappings: &'data [macho::DyldCacheMappingInfo<E>],
+}
+
+// This is the offset of the images_across_all_subcaches_count field.
+const MIN_HEADER_SIZE_SUBCACHES: u32 = 0x1c4;
+
+impl<'data, E, R> DyldCache<'data, E, R>
+where
+    E: Endian,
+    R: ReadRef<'data>,
+{
+    /// Parse the raw dyld shared cache data.
+    ///
+    /// For shared caches from macOS 12 / iOS 15 and above, the subcache files need to be
+    /// supplied as well, in the correct order, with the `.symbols` subcache last (if present).
+    /// For example, `data` would be the data for `dyld_shared_cache_x86_64`,
+    /// and `subcache_data` would be the data for `[dyld_shared_cache_x86_64.1, dyld_shared_cache_x86_64.2, ...]`.
+    pub fn parse(data: R, subcache_data: &[R]) -> Result<Self> {
+        let header = macho::DyldCacheHeader::parse(data)?;
+        let (arch, endian) = header.parse_magic()?;
+        let mappings = header.mappings(endian, data)?;
+
+        let symbols_subcache_uuid = header.symbols_subcache_uuid(endian);
+        let subcaches_info = header.subcaches(endian, data)?.unwrap_or(&[]);
+
+        if subcache_data.len() != subcaches_info.len() + symbols_subcache_uuid.is_some() as usize {
+            return Err(Error("Incorrect number of SubCaches"));
+        }
+
+        // Split out the .symbols subcache data from the other subcaches.
+        let (symbols_subcache_data_and_uuid, subcache_data) =
+            if let Some(symbols_uuid) = symbols_subcache_uuid {
+                let (sym_data, rest_data) = subcache_data.split_last().unwrap();
+                (Some((*sym_data, symbols_uuid)), rest_data)
+            } else {
+                (None, subcache_data)
+            };
+
+        // Read the regular SubCaches (.1, .2, ...), if present.
+        let mut subcaches = Vec::new();
+        for (&data, info) in subcache_data.iter().zip(subcaches_info.iter()) {
+            let sc_header = macho::DyldCacheHeader::<E>::parse(data)?;
+            if sc_header.uuid != info.uuid {
+                return Err(Error("Unexpected SubCache UUID"));
+            }
+            let mappings = sc_header.mappings(endian, data)?;
+            subcaches.push(DyldSubCache { data, mappings });
+        }
+
+        // Read the .symbols SubCache, if present.
+        // Other than the UUID verification, the symbols SubCache is currently unused.
+        let _symbols_subcache = match symbols_subcache_data_and_uuid {
+            Some((data, uuid)) => {
+                let sc_header = macho::DyldCacheHeader::<E>::parse(data)?;
+                if sc_header.uuid != uuid {
+                    return Err(Error("Unexpected .symbols SubCache UUID"));
+                }
+                let mappings = sc_header.mappings(endian, data)?;
+                Some(DyldSubCache { data, mappings })
+            }
+            None => None,
+        };
+
+        let images = header.images(endian, data)?;
+        Ok(DyldCache {
+            endian,
+            data,
+            subcaches,
+            mappings,
+            images,
+            arch,
+        })
+    }
+
+    /// Get the architecture type of the file.
+    pub fn architecture(&self) -> Architecture {
+        self.arch
+    }
+
+    /// Get the endianness of the file.
+    #[inline]
+    pub fn endianness(&self) -> Endianness {
+        if self.is_little_endian() {
+            Endianness::Little
+        } else {
+            Endianness::Big
+        }
+    }
+
+    /// Return true if the file is little endian, false if it is big endian.
+    pub fn is_little_endian(&self) -> bool {
+        self.endian.is_little_endian()
+    }
+
+    /// Iterate over the images in this cache.
+    pub fn images<'cache>(&'cache self) -> DyldCacheImageIterator<'data, 'cache, E, R> {
+        DyldCacheImageIterator {
+            cache: self,
+            iter: self.images.iter(),
+        }
+    }
+
+    /// Find the address in a mapping and return the cache or subcache data it was found in,
+    /// together with the translated file offset.
+    pub fn data_and_offset_for_address(&self, address: u64) -> Option<(R, u64)> {
+        if let Some(file_offset) = address_to_file_offset(address, self.endian, self.mappings) {
+            return Some((self.data, file_offset));
+        }
+        for subcache in &self.subcaches {
+            if let Some(file_offset) =
+                address_to_file_offset(address, self.endian, subcache.mappings)
+            {
+                return Some((subcache.data, file_offset));
+            }
+        }
+        None
+    }
+}
+
+/// An iterator over all the images (dylibs) in the dyld shared cache.
+#[derive(Debug)]
+pub struct DyldCacheImageIterator<'data, 'cache, E = Endianness, R = &'data [u8]>
+where
+    E: Endian,
+    R: ReadRef<'data>,
+{
+    cache: &'cache DyldCache<'data, E, R>,
+    iter: slice::Iter<'data, macho::DyldCacheImageInfo<E>>,
+}
+
+impl<'data, 'cache, E, R> Iterator for DyldCacheImageIterator<'data, 'cache, E, R>
+where
+    E: Endian,
+    R: ReadRef<'data>,
+{
+    type Item = DyldCacheImage<'data, 'cache, E, R>;
+
+    fn next(&mut self) -> Option<DyldCacheImage<'data, 'cache, E, R>> {
+        let image_info = self.iter.next()?;
+        Some(DyldCacheImage {
+            cache: self.cache,
+            image_info,
+        })
+    }
+}
+
+/// One image (dylib) from inside the dyld shared cache.
+#[derive(Debug)]
+pub struct DyldCacheImage<'data, 'cache, E = Endianness, R = &'data [u8]>
+where
+    E: Endian,
+    R: ReadRef<'data>,
+{
+    pub(crate) cache: &'cache DyldCache<'data, E, R>,
+    image_info: &'data macho::DyldCacheImageInfo<E>,
+}
+
+impl<'data, 'cache, E, R> DyldCacheImage<'data, 'cache, E, R>
+where
+    E: Endian,
+    R: ReadRef<'data>,
+{
+    /// The file system path of this image.
+    pub fn path(&self) -> Result<&'data str> {
+        let path = self.image_info.path(self.cache.endian, self.cache.data)?;
+        // The path should always be ascii, so from_utf8 should always succeed.
+        let path = core::str::from_utf8(path).map_err(|_| Error("Path string not valid utf-8"))?;
+        Ok(path)
+    }
+
+    /// The subcache data which contains the Mach-O header for this image,
+    /// together with the file offset at which this image starts.
+    pub fn image_data_and_offset(&self) -> Result<(R, u64)> {
+        let address = self.image_info.address.get(self.cache.endian);
+        self.cache
+            .data_and_offset_for_address(address)
+            .ok_or(Error("Address not found in any mapping"))
+    }
+
+    /// Parse this image into an Object.
+    pub fn parse_object(&self) -> Result<File<'data, R>> {
+        File::parse_dyld_cache_image(self)
+    }
+}
+
+impl<E: Endian> macho::DyldCacheHeader<E> {
+    /// Read the dyld cache header.
+    pub fn parse<'data, R: ReadRef<'data>>(data: R) -> Result<&'data Self> {
+        data.read_at::<macho::DyldCacheHeader<E>>(0)
+            .read_error("Invalid dyld cache header size or alignment")
+    }
+
+    /// Returns (arch, endian) based on the magic string.
+    pub fn parse_magic(&self) -> Result<(Architecture, E)> {
+        let (arch, is_big_endian) = match &self.magic {
+            b"dyld_v1    i386\0" => (Architecture::I386, false),
+            b"dyld_v1  x86_64\0" => (Architecture::X86_64, false),
+            b"dyld_v1 x86_64h\0" => (Architecture::X86_64, false),
+            b"dyld_v1     ppc\0" => (Architecture::PowerPc, true),
+            b"dyld_v1   armv6\0" => (Architecture::Arm, false),
+            b"dyld_v1   armv7\0" => (Architecture::Arm, false),
+            b"dyld_v1  armv7f\0" => (Architecture::Arm, false),
+            b"dyld_v1  armv7s\0" => (Architecture::Arm, false),
+            b"dyld_v1  armv7k\0" => (Architecture::Arm, false),
+            b"dyld_v1   arm64\0" => (Architecture::Aarch64, false),
+            b"dyld_v1  arm64e\0" => (Architecture::Aarch64, false),
+            _ => return Err(Error("Unrecognized dyld cache magic")),
+        };
+        let endian =
+            E::from_big_endian(is_big_endian).read_error("Unsupported dyld cache endian")?;
+        Ok((arch, endian))
+    }
+
+    /// Return the mapping information table.
+    pub fn mappings<'data, R: ReadRef<'data>>(
+        &self,
+        endian: E,
+        data: R,
+    ) -> Result<&'data [macho::DyldCacheMappingInfo<E>]> {
+        data.read_slice_at::<macho::DyldCacheMappingInfo<E>>(
+            self.mapping_offset.get(endian).into(),
+            self.mapping_count.get(endian) as usize,
+        )
+        .read_error("Invalid dyld cache mapping size or alignment")
+    }
+
+    /// Return the information about subcaches, if present.
+    pub fn subcaches<'data, R: ReadRef<'data>>(
+        &self,
+        endian: E,
+        data: R,
+    ) -> Result<Option<&'data [macho::DyldSubCacheInfo<E>]>> {
+        if self.mapping_offset.get(endian) >= MIN_HEADER_SIZE_SUBCACHES {
+            let subcaches = data
+                .read_slice_at::<macho::DyldSubCacheInfo<E>>(
+                    self.subcaches_offset.get(endian).into(),
+                    self.subcaches_count.get(endian) as usize,
+                )
+                .read_error("Invalid dyld subcaches size or alignment")?;
+            Ok(Some(subcaches))
+        } else {
+            Ok(None)
+        }
+    }
+
+    /// Return the UUID for the .symbols subcache, if present.
+    pub fn symbols_subcache_uuid(&self, endian: E) -> Option<[u8; 16]> {
+        if self.mapping_offset.get(endian) >= MIN_HEADER_SIZE_SUBCACHES {
+            let uuid = self.symbols_subcache_uuid;
+            if uuid != [0; 16] {
+                return Some(uuid);
+            }
+        }
+        None
+    }
+
+    /// Return the image information table.
+    pub fn images<'data, R: ReadRef<'data>>(
+        &self,
+        endian: E,
+        data: R,
+    ) -> Result<&'data [macho::DyldCacheImageInfo<E>]> {
+        if self.mapping_offset.get(endian) >= MIN_HEADER_SIZE_SUBCACHES {
+            data.read_slice_at::<macho::DyldCacheImageInfo<E>>(
+                self.images_across_all_subcaches_offset.get(endian).into(),
+                self.images_across_all_subcaches_count.get(endian) as usize,
+            )
+            .read_error("Invalid dyld cache image size or alignment")
+        } else {
+            data.read_slice_at::<macho::DyldCacheImageInfo<E>>(
+                self.images_offset.get(endian).into(),
+                self.images_count.get(endian) as usize,
+            )
+            .read_error("Invalid dyld cache image size or alignment")
+        }
+    }
+}
+
+impl<E: Endian> macho::DyldCacheImageInfo<E> {
+    /// The file system path of this image.
+    pub fn path<'data, R: ReadRef<'data>>(&self, endian: E, data: R) -> Result<&'data [u8]> {
+        let r_start = self.path_file_offset.get(endian).into();
+        let r_end = data.len().read_error("Couldn't get data len()")?;
+        data.read_bytes_at_until(r_start..r_end, 0)
+            .read_error("Couldn't read dyld cache image path")
+    }
+
+    /// Find the file offset of the image by looking up its address in the mappings.
+    pub fn file_offset(
+        &self,
+        endian: E,
+        mappings: &[macho::DyldCacheMappingInfo<E>],
+    ) -> Result<u64> {
+        let address = self.address.get(endian);
+        address_to_file_offset(address, endian, mappings)
+            .read_error("Invalid dyld cache image address")
+    }
+}
+
+/// Find the file offset of the image by looking up its address in the mappings.
+pub fn address_to_file_offset<E: Endian>(
+    address: u64,
+    endian: E,
+    mappings: &[macho::DyldCacheMappingInfo<E>],
+) -> Option<u64> {
+    for mapping in mappings {
+        let mapping_address = mapping.address.get(endian);
+        if address >= mapping_address
+            && address < mapping_address.wrapping_add(mapping.size.get(endian))
+        {
+            return Some(address - mapping_address + mapping.file_offset.get(endian));
+        }
+    }
+    None
+}

vendor/object/src/read/macho/fat.rs

@@ -0,0 +1,122 @@
+use crate::read::{Architecture, Error, ReadError, ReadRef, Result};
+use crate::{macho, BigEndian, Pod};
+
+pub use macho::{FatArch32, FatArch64, FatHeader};
+
+impl FatHeader {
+    /// Attempt to parse a fat header.
+    ///
+    /// Does not validate the magic value.
+    pub fn parse<'data, R: ReadRef<'data>>(file: R) -> Result<&'data FatHeader> {
+        file.read_at::<FatHeader>(0)
+            .read_error("Invalid fat header size or alignment")
+    }
+
+    /// Attempt to parse a fat header and 32-bit fat arches.
+    pub fn parse_arch32<'data, R: ReadRef<'data>>(file: R) -> Result<&'data [FatArch32]> {
+        let mut offset = 0;
+        let header = file
+            .read::<FatHeader>(&mut offset)
+            .read_error("Invalid fat header size or alignment")?;
+        if header.magic.get(BigEndian) != macho::FAT_MAGIC {
+            return Err(Error("Invalid 32-bit fat magic"));
+        }
+        file.read_slice::<FatArch32>(&mut offset, header.nfat_arch.get(BigEndian) as usize)
+            .read_error("Invalid nfat_arch")
+    }
+
+    /// Attempt to parse a fat header and 64-bit fat arches.
+    pub fn parse_arch64<'data, R: ReadRef<'data>>(file: R) -> Result<&'data [FatArch64]> {
+        let mut offset = 0;
+        let header = file
+            .read::<FatHeader>(&mut offset)
+            .read_error("Invalid fat header size or alignment")?;
+        if header.magic.get(BigEndian) != macho::FAT_MAGIC_64 {
+            return Err(Error("Invalid 64-bit fat magic"));
+        }
+        file.read_slice::<FatArch64>(&mut offset, header.nfat_arch.get(BigEndian) as usize)
+            .read_error("Invalid nfat_arch")
+    }
+}
+
+/// A trait for generic access to [`macho::FatArch32`] and [`macho::FatArch64`].
+#[allow(missing_docs)]
+pub trait FatArch: Pod {
+    type Word: Into<u64>;
+
+    fn cputype(&self) -> u32;
+    fn cpusubtype(&self) -> u32;
+    fn offset(&self) -> Self::Word;
+    fn size(&self) -> Self::Word;
+    fn align(&self) -> u32;
+
+    fn architecture(&self) -> Architecture {
+        match self.cputype() {
+            macho::CPU_TYPE_ARM => Architecture::Arm,
+            macho::CPU_TYPE_ARM64 => Architecture::Aarch64,
+            macho::CPU_TYPE_X86 => Architecture::I386,
+            macho::CPU_TYPE_X86_64 => Architecture::X86_64,
+            macho::CPU_TYPE_MIPS => Architecture::Mips,
+            macho::CPU_TYPE_POWERPC => Architecture::PowerPc,
+            macho::CPU_TYPE_POWERPC64 => Architecture::PowerPc64,
+            _ => Architecture::Unknown,
+        }
+    }
+
+    fn file_range(&self) -> (u64, u64) {
+        (self.offset().into(), self.size().into())
+    }
+
+    fn data<'data, R: ReadRef<'data>>(&self, file: R) -> Result<&'data [u8]> {
+        file.read_bytes_at(self.offset().into(), self.size().into())
+            .read_error("Invalid fat arch offset or size")
+    }
+}
+
+impl FatArch for FatArch32 {
+    type Word = u32;
+
+    fn cputype(&self) -> u32 {
+        self.cputype.get(BigEndian)
+    }
+
+    fn cpusubtype(&self) -> u32 {
+        self.cpusubtype.get(BigEndian)
+    }
+
+    fn offset(&self) -> Self::Word {
+        self.offset.get(BigEndian)
+    }
+
+    fn size(&self) -> Self::Word {
+        self.size.get(BigEndian)
+    }
+
+    fn align(&self) -> u32 {
+        self.align.get(BigEndian)
+    }
+}
+
+impl FatArch for FatArch64 {
+    type Word = u64;
+
+    fn cputype(&self) -> u32 {
+        self.cputype.get(BigEndian)
+    }
+
+    fn cpusubtype(&self) -> u32 {
+        self.cpusubtype.get(BigEndian)
+    }
+
+    fn offset(&self) -> Self::Word {
+        self.offset.get(BigEndian)
+    }
+
+    fn size(&self) -> Self::Word {
+        self.size.get(BigEndian)
+    }
+
+    fn align(&self) -> u32 {
+        self.align.get(BigEndian)
+    }
+}

vendor/object/src/read/macho/file.rs

@@ -0,0 +1,781 @@
+use alloc::vec::Vec;
+use core::fmt::Debug;
+use core::{mem, str};
+
+use crate::read::{
+    self, Architecture, ComdatKind, Error, Export, FileFlags, Import, NoDynamicRelocationIterator,
+    Object, ObjectComdat, ObjectKind, ObjectMap, ObjectSection, ReadError, ReadRef, Result,
+    SectionIndex, SubArchitecture, SymbolIndex,
+};
+use crate::{endian, macho, BigEndian, ByteString, Endian, Endianness, Pod};
+
+use super::{
+    DyldCacheImage, LoadCommandIterator, MachOSection, MachOSectionInternal, MachOSectionIterator,
+    MachOSegment, MachOSegmentInternal, MachOSegmentIterator, MachOSymbol, MachOSymbolIterator,
+    MachOSymbolTable, Nlist, Section, Segment, SymbolTable,
+};
+
+/// A 32-bit Mach-O object file.
+///
+/// This is a file that starts with [`macho::MachHeader32`], and corresponds
+/// to [`crate::FileKind::MachO32`].
+pub type MachOFile32<'data, Endian = Endianness, R = &'data [u8]> =
+    MachOFile<'data, macho::MachHeader32<Endian>, R>;
+/// A 64-bit Mach-O object file.
+///
+/// This is a file that starts with [`macho::MachHeader64`], and corresponds
+/// to [`crate::FileKind::MachO64`].
+pub type MachOFile64<'data, Endian = Endianness, R = &'data [u8]> =
+    MachOFile<'data, macho::MachHeader64<Endian>, R>;
+
+/// A partially parsed Mach-O file.
+///
+/// Most of the functionality of this type is provided by the [`Object`] trait implementation.
+#[derive(Debug)]
+pub struct MachOFile<'data, Mach, R = &'data [u8]>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) endian: Mach::Endian,
+    pub(super) data: R,
+    pub(super) header_offset: u64,
+    pub(super) header: &'data Mach,
+    pub(super) segments: Vec<MachOSegmentInternal<'data, Mach, R>>,
+    pub(super) sections: Vec<MachOSectionInternal<'data, Mach>>,
+    pub(super) symbols: SymbolTable<'data, Mach, R>,
+}
+
+impl<'data, Mach, R> MachOFile<'data, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    /// Parse the raw Mach-O file data.
+    pub fn parse(data: R) -> Result<Self> {
+        let header = Mach::parse(data, 0)?;
+        let endian = header.endian()?;
+
+        // Build a list of segments and sections to make some operations more efficient.
+        let mut segments = Vec::new();
+        let mut sections = Vec::new();
+        let mut symbols = SymbolTable::default();
+        if let Ok(mut commands) = header.load_commands(endian, data, 0) {
+            while let Ok(Some(command)) = commands.next() {
+                if let Some((segment, section_data)) = Mach::Segment::from_command(command)? {
+                    let segment_index = segments.len();
+                    segments.push(MachOSegmentInternal { segment, data });
+                    for section in segment.sections(endian, section_data)? {
+                        let index = SectionIndex(sections.len() + 1);
+                        sections.push(MachOSectionInternal::parse(index, segment_index, section));
+                    }
+                } else if let Some(symtab) = command.symtab()? {
+                    symbols = symtab.symbols(endian, data)?;
+                }
+            }
+        }
+
+        Ok(MachOFile {
+            endian,
+            data,
+            header_offset: 0,
+            header,
+            segments,
+            sections,
+            symbols,
+        })
+    }
+
+    /// Parse the Mach-O file for the given image from the dyld shared cache.
+    /// This will read different sections from different subcaches, if necessary.
+    pub fn parse_dyld_cache_image<'cache, E: Endian>(
+        image: &DyldCacheImage<'data, 'cache, E, R>,
+    ) -> Result<Self> {
+        let (data, header_offset) = image.image_data_and_offset()?;
+        let header = Mach::parse(data, header_offset)?;
+        let endian = header.endian()?;
+
+        // Build a list of sections to make some operations more efficient.
+        // Also build a list of segments, because we need to remember which ReadRef
+        // to read each section's data from. Only the DyldCache knows this information,
+        // and we won't have access to it once we've exited this function.
+        let mut segments = Vec::new();
+        let mut sections = Vec::new();
+        let mut linkedit_data: Option<R> = None;
+        let mut symtab = None;
+        if let Ok(mut commands) = header.load_commands(endian, data, header_offset) {
+            while let Ok(Some(command)) = commands.next() {
+                if let Some((segment, section_data)) = Mach::Segment::from_command(command)? {
+                    // Each segment can be stored in a different subcache. Get the segment's
+                    // address and look it up in the cache mappings, to find the correct cache data.
+                    let addr = segment.vmaddr(endian).into();
+                    let (data, _offset) = image
+                        .cache
+                        .data_and_offset_for_address(addr)
+                        .read_error("Could not find segment data in dyld shared cache")?;
+                    if segment.name() == macho::SEG_LINKEDIT.as_bytes() {
+                        linkedit_data = Some(data);
+                    }
+                    let segment_index = segments.len();
+                    segments.push(MachOSegmentInternal { segment, data });
+
+                    for section in segment.sections(endian, section_data)? {
+                        let index = SectionIndex(sections.len() + 1);
+                        sections.push(MachOSectionInternal::parse(index, segment_index, section));
+                    }
+                } else if let Some(st) = command.symtab()? {
+                    symtab = Some(st);
+                }
+            }
+        }
+
+        // The symbols are found in the __LINKEDIT segment, so make sure to read them from the
+        // correct subcache.
+        let symbols = match (symtab, linkedit_data) {
+            (Some(symtab), Some(linkedit_data)) => symtab.symbols(endian, linkedit_data)?,
+            _ => SymbolTable::default(),
+        };
+
+        Ok(MachOFile {
+            endian,
+            data,
+            header_offset,
+            header,
+            segments,
+            sections,
+            symbols,
+        })
+    }
+
+    /// Return the section at the given index.
+    #[inline]
+    pub(super) fn section_internal(
+        &self,
+        index: SectionIndex,
+    ) -> Result<&MachOSectionInternal<'data, Mach>> {
+        index
+            .0
+            .checked_sub(1)
+            .and_then(|index| self.sections.get(index))
+            .read_error("Invalid Mach-O section index")
+    }
+
+    pub(super) fn segment_internal(
+        &self,
+        index: usize,
+    ) -> Result<&MachOSegmentInternal<'data, Mach, R>> {
+        self.segments
+            .get(index)
+            .read_error("Invalid Mach-O segment index")
+    }
+
+    /// Returns the endianness.
+    pub fn endian(&self) -> Mach::Endian {
+        self.endian
+    }
+
+    /// Returns the raw data.
+    pub fn data(&self) -> R {
+        self.data
+    }
+
+    /// Returns the raw Mach-O file header.
+    pub fn raw_header(&self) -> &'data Mach {
+        self.header
+    }
+
+    /// Return the `LC_BUILD_VERSION` load command if present.
+    pub fn build_version(&self) -> Result<Option<&'data macho::BuildVersionCommand<Mach::Endian>>> {
+        let mut commands = self
+            .header
+            .load_commands(self.endian, self.data, self.header_offset)?;
+        while let Some(command) = commands.next()? {
+            if let Some(build_version) = command.build_version()? {
+                return Ok(Some(build_version));
+            }
+        }
+        Ok(None)
+    }
+}
+
+impl<'data, Mach, R> read::private::Sealed for MachOFile<'data, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+}
+
+impl<'data, 'file, Mach, R> Object<'data, 'file> for MachOFile<'data, Mach, R>
+where
+    'data: 'file,
+    Mach: MachHeader,
+    R: 'file + ReadRef<'data>,
+{
+    type Segment = MachOSegment<'data, 'file, Mach, R>;
+    type SegmentIterator = MachOSegmentIterator<'data, 'file, Mach, R>;
+    type Section = MachOSection<'data, 'file, Mach, R>;
+    type SectionIterator = MachOSectionIterator<'data, 'file, Mach, R>;
+    type Comdat = MachOComdat<'data, 'file, Mach, R>;
+    type ComdatIterator = MachOComdatIterator<'data, 'file, Mach, R>;
+    type Symbol = MachOSymbol<'data, 'file, Mach, R>;
+    type SymbolIterator = MachOSymbolIterator<'data, 'file, Mach, R>;
+    type SymbolTable = MachOSymbolTable<'data, 'file, Mach, R>;
+    type DynamicRelocationIterator = NoDynamicRelocationIterator;
+
+    fn architecture(&self) -> Architecture {
+        match self.header.cputype(self.endian) {
+            macho::CPU_TYPE_ARM => Architecture::Arm,
+            macho::CPU_TYPE_ARM64 => Architecture::Aarch64,
+            macho::CPU_TYPE_ARM64_32 => Architecture::Aarch64_Ilp32,
+            macho::CPU_TYPE_X86 => Architecture::I386,
+            macho::CPU_TYPE_X86_64 => Architecture::X86_64,
+            macho::CPU_TYPE_MIPS => Architecture::Mips,
+            macho::CPU_TYPE_POWERPC => Architecture::PowerPc,
+            macho::CPU_TYPE_POWERPC64 => Architecture::PowerPc64,
+            _ => Architecture::Unknown,
+        }
+    }
+
+    fn sub_architecture(&self) -> Option<SubArchitecture> {
+        match (
+            self.header.cputype(self.endian),
+            self.header.cpusubtype(self.endian),
+        ) {
+            (macho::CPU_TYPE_ARM64, macho::CPU_SUBTYPE_ARM64E) => Some(SubArchitecture::Arm64E),
+            _ => None,
+        }
+    }
+
+    #[inline]
+    fn is_little_endian(&self) -> bool {
+        self.header.is_little_endian()
+    }
+
+    #[inline]
+    fn is_64(&self) -> bool {
+        self.header.is_type_64()
+    }
+
+    fn kind(&self) -> ObjectKind {
+        match self.header.filetype(self.endian) {
+            macho::MH_OBJECT => ObjectKind::Relocatable,
+            macho::MH_EXECUTE => ObjectKind::Executable,
+            macho::MH_CORE => ObjectKind::Core,
+            macho::MH_DYLIB => ObjectKind::Dynamic,
+            _ => ObjectKind::Unknown,
+        }
+    }
+
+    fn segments(&'file self) -> MachOSegmentIterator<'data, 'file, Mach, R> {
+        MachOSegmentIterator {
+            file: self,
+            iter: self.segments.iter(),
+        }
+    }
+
+    fn section_by_name_bytes(
+        &'file self,
+        section_name: &[u8],
+    ) -> Option<MachOSection<'data, 'file, Mach, R>> {
+        // Translate the "." prefix to the "__" prefix used by OSX/Mach-O, eg
+        // ".debug_info" to "__debug_info", and limit to 16 bytes total.
+        let system_name = if section_name.starts_with(b".") {
+            if section_name.len() > 15 {
+                Some(&section_name[1..15])
+            } else {
+                Some(&section_name[1..])
+            }
+        } else {
+            None
+        };
+        let cmp_section_name = |section: &MachOSection<'data, 'file, Mach, R>| {
+            section
+                .name_bytes()
+                .map(|name| {
+                    section_name == name
+                        || system_name
+                            .filter(|system_name| {
+                                name.starts_with(b"__") && name[2..] == **system_name
+                            })
+                            .is_some()
+                })
+                .unwrap_or(false)
+        };
+
+        self.sections().find(cmp_section_name)
+    }
+
+    fn section_by_index(
+        &'file self,
+        index: SectionIndex,
+    ) -> Result<MachOSection<'data, 'file, Mach, R>> {
+        let internal = *self.section_internal(index)?;
+        Ok(MachOSection {
+            file: self,
+            internal,
+        })
+    }
+
+    fn sections(&'file self) -> MachOSectionIterator<'data, 'file, Mach, R> {
+        MachOSectionIterator {
+            file: self,
+            iter: self.sections.iter(),
+        }
+    }
+
+    fn comdats(&'file self) -> MachOComdatIterator<'data, 'file, Mach, R> {
+        MachOComdatIterator { file: self }
+    }
+
+    fn symbol_by_index(
+        &'file self,
+        index: SymbolIndex,
+    ) -> Result<MachOSymbol<'data, 'file, Mach, R>> {
+        let nlist = self.symbols.symbol(index.0)?;
+        MachOSymbol::new(self, index, nlist).read_error("Unsupported Mach-O symbol index")
+    }
+
+    fn symbols(&'file self) -> MachOSymbolIterator<'data, 'file, Mach, R> {
+        MachOSymbolIterator {
+            file: self,
+            index: 0,
+        }
+    }
+
+    #[inline]
+    fn symbol_table(&'file self) -> Option<MachOSymbolTable<'data, 'file, Mach, R>> {
+        Some(MachOSymbolTable { file: self })
+    }
+
+    fn dynamic_symbols(&'file self) -> MachOSymbolIterator<'data, 'file, Mach, R> {
+        MachOSymbolIterator {
+            file: self,
+            index: self.symbols.len(),
+        }
+    }
+
+    #[inline]
+    fn dynamic_symbol_table(&'file self) -> Option<MachOSymbolTable<'data, 'file, Mach, R>> {
+        None
+    }
+
+    fn object_map(&'file self) -> ObjectMap<'data> {
+        self.symbols.object_map(self.endian)
+    }
+
+    fn imports(&self) -> Result<Vec<Import<'data>>> {
+        let mut dysymtab = None;
+        let mut libraries = Vec::new();
+        let twolevel = self.header.flags(self.endian) & macho::MH_TWOLEVEL != 0;
+        if twolevel {
+            libraries.push(&[][..]);
+        }
+        let mut commands = self
+            .header
+            .load_commands(self.endian, self.data, self.header_offset)?;
+        while let Some(command) = commands.next()? {
+            if let Some(command) = command.dysymtab()? {
+                dysymtab = Some(command);
+            }
+            if twolevel {
+                if let Some(dylib) = command.dylib()? {
+                    libraries.push(command.string(self.endian, dylib.dylib.name)?);
+                }
+            }
+        }
+
+        let mut imports = Vec::new();
+        if let Some(dysymtab) = dysymtab {
+            let index = dysymtab.iundefsym.get(self.endian) as usize;
+            let number = dysymtab.nundefsym.get(self.endian) as usize;
+            for i in index..(index.wrapping_add(number)) {
+                let symbol = self.symbols.symbol(i)?;
+                let name = symbol.name(self.endian, self.symbols.strings())?;
+                let library = if twolevel {
+                    libraries
+                        .get(symbol.library_ordinal(self.endian) as usize)
+                        .copied()
+                        .read_error("Invalid Mach-O symbol library ordinal")?
+                } else {
+                    &[]
+                };
+                imports.push(Import {
+                    name: ByteString(name),
+                    library: ByteString(library),
+                });
+            }
+        }
+        Ok(imports)
+    }
+
+    fn exports(&self) -> Result<Vec<Export<'data>>> {
+        let mut dysymtab = None;
+        let mut commands = self
+            .header
+            .load_commands(self.endian, self.data, self.header_offset)?;
+        while let Some(command) = commands.next()? {
+            if let Some(command) = command.dysymtab()? {
+                dysymtab = Some(command);
+                break;
+            }
+        }
+
+        let mut exports = Vec::new();
+        if let Some(dysymtab) = dysymtab {
+            let index = dysymtab.iextdefsym.get(self.endian) as usize;
+            let number = dysymtab.nextdefsym.get(self.endian) as usize;
+            for i in index..(index.wrapping_add(number)) {
+                let symbol = self.symbols.symbol(i)?;
+                let name = symbol.name(self.endian, self.symbols.strings())?;
+                let address = symbol.n_value(self.endian).into();
+                exports.push(Export {
+                    name: ByteString(name),
+                    address,
+                });
+            }
+        }
+        Ok(exports)
+    }
+
+    #[inline]
+    fn dynamic_relocations(&'file self) -> Option<NoDynamicRelocationIterator> {
+        None
+    }
+
+    fn has_debug_symbols(&self) -> bool {
+        self.section_by_name(".debug_info").is_some()
+    }
+
+    fn mach_uuid(&self) -> Result<Option<[u8; 16]>> {
+        self.header.uuid(self.endian, self.data, self.header_offset)
+    }
+
+    fn relative_address_base(&self) -> u64 {
+        0
+    }
+
+    fn entry(&self) -> u64 {
+        if let Ok(mut commands) =
+            self.header
+                .load_commands(self.endian, self.data, self.header_offset)
+        {
+            while let Ok(Some(command)) = commands.next() {
+                if let Ok(Some(command)) = command.entry_point() {
+                    return command.entryoff.get(self.endian);
+                }
+            }
+        }
+        0
+    }
+
+    fn flags(&self) -> FileFlags {
+        FileFlags::MachO {
+            flags: self.header.flags(self.endian),
+        }
+    }
+}
+
+/// An iterator for the COMDAT section groups in a [`MachOFile64`].
+pub type MachOComdatIterator32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOComdatIterator<'data, 'file, macho::MachHeader32<Endian>, R>;
+/// An iterator for the COMDAT section groups in a [`MachOFile64`].
+pub type MachOComdatIterator64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOComdatIterator<'data, 'file, macho::MachHeader64<Endian>, R>;
+
+/// An iterator for the COMDAT section groups in a [`MachOFile`].
+///
+/// This is a stub that doesn't implement any functionality.
+#[derive(Debug)]
+pub struct MachOComdatIterator<'data, 'file, Mach, R = &'data [u8]>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    #[allow(unused)]
+    file: &'file MachOFile<'data, Mach, R>,
+}
+
+impl<'data, 'file, Mach, R> Iterator for MachOComdatIterator<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    type Item = MachOComdat<'data, 'file, Mach, R>;
+
+    #[inline]
+    fn next(&mut self) -> Option<Self::Item> {
+        None
+    }
+}
+
+/// A COMDAT section group in a [`MachOFile32`].
+pub type MachOComdat32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOComdat<'data, 'file, macho::MachHeader32<Endian>, R>;
+
+/// A COMDAT section group in a [`MachOFile64`].
+pub type MachOComdat64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOComdat<'data, 'file, macho::MachHeader64<Endian>, R>;
+
+/// A COMDAT section group in a [`MachOFile`].
+///
+/// This is a stub that doesn't implement any functionality.
+#[derive(Debug)]
+pub struct MachOComdat<'data, 'file, Mach, R = &'data [u8]>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    #[allow(unused)]
+    file: &'file MachOFile<'data, Mach, R>,
+}
+
+impl<'data, 'file, Mach, R> read::private::Sealed for MachOComdat<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+}
+
+impl<'data, 'file, Mach, R> ObjectComdat<'data> for MachOComdat<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    type SectionIterator = MachOComdatSectionIterator<'data, 'file, Mach, R>;
+
+    #[inline]
+    fn kind(&self) -> ComdatKind {
+        unreachable!();
+    }
+
+    #[inline]
+    fn symbol(&self) -> SymbolIndex {
+        unreachable!();
+    }
+
+    #[inline]
+    fn name_bytes(&self) -> Result<&[u8]> {
+        unreachable!();
+    }
+
+    #[inline]
+    fn name(&self) -> Result<&str> {
+        unreachable!();
+    }
+
+    #[inline]
+    fn sections(&self) -> Self::SectionIterator {
+        unreachable!();
+    }
+}
+
+/// An iterator for the sections in a COMDAT section group in a [`MachOFile32`].
+pub type MachOComdatSectionIterator32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOComdatSectionIterator<'data, 'file, macho::MachHeader32<Endian>, R>;
+/// An iterator for the sections in a COMDAT section group in a [`MachOFile64`].
+pub type MachOComdatSectionIterator64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOComdatSectionIterator<'data, 'file, macho::MachHeader64<Endian>, R>;
+
+/// An iterator for the sections in a COMDAT section group in a [`MachOFile`].
+///
+/// This is a stub that doesn't implement any functionality.
+#[derive(Debug)]
+pub struct MachOComdatSectionIterator<'data, 'file, Mach, R = &'data [u8]>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    #[allow(unused)]
+    file: &'file MachOFile<'data, Mach, R>,
+}
+
+impl<'data, 'file, Mach, R> Iterator for MachOComdatSectionIterator<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    type Item = SectionIndex;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        None
+    }
+}
+
+/// A trait for generic access to [`macho::MachHeader32`] and [`macho::MachHeader64`].
+#[allow(missing_docs)]
+pub trait MachHeader: Debug + Pod {
+    type Word: Into<u64>;
+    type Endian: endian::Endian;
+    type Segment: Segment<Endian = Self::Endian, Section = Self::Section>;
+    type Section: Section<Endian = Self::Endian>;
+    type Nlist: Nlist<Endian = Self::Endian>;
+
+    /// Return true if this type is a 64-bit header.
+    ///
+    /// This is a property of the type, not a value in the header data.
+    fn is_type_64(&self) -> bool;
+
+    /// Return true if the `magic` field signifies big-endian.
+    fn is_big_endian(&self) -> bool;
+
+    /// Return true if the `magic` field signifies little-endian.
+    fn is_little_endian(&self) -> bool;
+
+    fn magic(&self) -> u32;
+    fn cputype(&self, endian: Self::Endian) -> u32;
+    fn cpusubtype(&self, endian: Self::Endian) -> u32;
+    fn filetype(&self, endian: Self::Endian) -> u32;
+    fn ncmds(&self, endian: Self::Endian) -> u32;
+    fn sizeofcmds(&self, endian: Self::Endian) -> u32;
+    fn flags(&self, endian: Self::Endian) -> u32;
+
+    // Provided methods.
+
+    /// Read the file header.
+    ///
+    /// Also checks that the magic field in the file header is a supported format.
+    fn parse<'data, R: ReadRef<'data>>(data: R, offset: u64) -> read::Result<&'data Self> {
+        let header = data
+            .read_at::<Self>(offset)
+            .read_error("Invalid Mach-O header size or alignment")?;
+        if !header.is_supported() {
+            return Err(Error("Unsupported Mach-O header"));
+        }
+        Ok(header)
+    }
+
+    fn is_supported(&self) -> bool {
+        self.is_little_endian() || self.is_big_endian()
+    }
+
+    fn endian(&self) -> Result<Self::Endian> {
+        Self::Endian::from_big_endian(self.is_big_endian()).read_error("Unsupported Mach-O endian")
+    }
+
+    fn load_commands<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Self::Endian,
+        data: R,
+        header_offset: u64,
+    ) -> Result<LoadCommandIterator<'data, Self::Endian>> {
+        let data = data
+            .read_bytes_at(
+                header_offset + mem::size_of::<Self>() as u64,
+                self.sizeofcmds(endian).into(),
+            )
+            .read_error("Invalid Mach-O load command table size")?;
+        Ok(LoadCommandIterator::new(endian, data, self.ncmds(endian)))
+    }
+
+    /// Return the UUID from the `LC_UUID` load command, if one is present.
+    fn uuid<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Self::Endian,
+        data: R,
+        header_offset: u64,
+    ) -> Result<Option<[u8; 16]>> {
+        let mut commands = self.load_commands(endian, data, header_offset)?;
+        while let Some(command) = commands.next()? {
+            if let Ok(Some(uuid)) = command.uuid() {
+                return Ok(Some(uuid.uuid));
+            }
+        }
+        Ok(None)
+    }
+}
+
+impl<Endian: endian::Endian> MachHeader for macho::MachHeader32<Endian> {
+    type Word = u32;
+    type Endian = Endian;
+    type Segment = macho::SegmentCommand32<Endian>;
+    type Section = macho::Section32<Endian>;
+    type Nlist = macho::Nlist32<Endian>;
+
+    fn is_type_64(&self) -> bool {
+        false
+    }
+
+    fn is_big_endian(&self) -> bool {
+        self.magic() == macho::MH_MAGIC
+    }
+
+    fn is_little_endian(&self) -> bool {
+        self.magic() == macho::MH_CIGAM
+    }
+
+    fn magic(&self) -> u32 {
+        self.magic.get(BigEndian)
+    }
+
+    fn cputype(&self, endian: Self::Endian) -> u32 {
+        self.cputype.get(endian)
+    }
+
+    fn cpusubtype(&self, endian: Self::Endian) -> u32 {
+        self.cpusubtype.get(endian)
+    }
+
+    fn filetype(&self, endian: Self::Endian) -> u32 {
+        self.filetype.get(endian)
+    }
+
+    fn ncmds(&self, endian: Self::Endian) -> u32 {
+        self.ncmds.get(endian)
+    }
+
+    fn sizeofcmds(&self, endian: Self::Endian) -> u32 {
+        self.sizeofcmds.get(endian)
+    }
+
+    fn flags(&self, endian: Self::Endian) -> u32 {
+        self.flags.get(endian)
+    }
+}
+
+impl<Endian: endian::Endian> MachHeader for macho::MachHeader64<Endian> {
+    type Word = u64;
+    type Endian = Endian;
+    type Segment = macho::SegmentCommand64<Endian>;
+    type Section = macho::Section64<Endian>;
+    type Nlist = macho::Nlist64<Endian>;
+
+    fn is_type_64(&self) -> bool {
+        true
+    }
+
+    fn is_big_endian(&self) -> bool {
+        self.magic() == macho::MH_MAGIC_64
+    }
+
+    fn is_little_endian(&self) -> bool {
+        self.magic() == macho::MH_CIGAM_64
+    }
+
+    fn magic(&self) -> u32 {
+        self.magic.get(BigEndian)
+    }
+
+    fn cputype(&self, endian: Self::Endian) -> u32 {
+        self.cputype.get(endian)
+    }
+
+    fn cpusubtype(&self, endian: Self::Endian) -> u32 {
+        self.cpusubtype.get(endian)
+    }
+
+    fn filetype(&self, endian: Self::Endian) -> u32 {
+        self.filetype.get(endian)
+    }
+
+    fn ncmds(&self, endian: Self::Endian) -> u32 {
+        self.ncmds.get(endian)
+    }
+
+    fn sizeofcmds(&self, endian: Self::Endian) -> u32 {
+        self.sizeofcmds.get(endian)
+    }
+
+    fn flags(&self, endian: Self::Endian) -> u32 {
+        self.flags.get(endian)
+    }
+}

vendor/object/src/read/macho/load_command.rs

@@ -0,0 +1,382 @@
+use core::marker::PhantomData;
+use core::mem;
+
+use crate::endian::Endian;
+use crate::macho;
+use crate::pod::Pod;
+use crate::read::macho::{MachHeader, SymbolTable};
+use crate::read::{Bytes, Error, ReadError, ReadRef, Result, StringTable};
+
+/// An iterator for the load commands from a [`MachHeader`].
+#[derive(Debug, Default, Clone, Copy)]
+pub struct LoadCommandIterator<'data, E: Endian> {
+    endian: E,
+    data: Bytes<'data>,
+    ncmds: u32,
+}
+
+impl<'data, E: Endian> LoadCommandIterator<'data, E> {
+    pub(super) fn new(endian: E, data: &'data [u8], ncmds: u32) -> Self {
+        LoadCommandIterator {
+            endian,
+            data: Bytes(data),
+            ncmds,
+        }
+    }
+
+    /// Return the next load command.
+    pub fn next(&mut self) -> Result<Option<LoadCommandData<'data, E>>> {
+        if self.ncmds == 0 {
+            return Ok(None);
+        }
+        let header = self
+            .data
+            .read_at::<macho::LoadCommand<E>>(0)
+            .read_error("Invalid Mach-O load command header")?;
+        let cmd = header.cmd.get(self.endian);
+        let cmdsize = header.cmdsize.get(self.endian) as usize;
+        if cmdsize < mem::size_of::<macho::LoadCommand<E>>() {
+            return Err(Error("Invalid Mach-O load command size"));
+        }
+        let data = self
+            .data
+            .read_bytes(cmdsize)
+            .read_error("Invalid Mach-O load command size")?;
+        self.ncmds -= 1;
+        Ok(Some(LoadCommandData {
+            cmd,
+            data,
+            marker: Default::default(),
+        }))
+    }
+}
+
+/// The data for a [`macho::LoadCommand`].
+#[derive(Debug, Clone, Copy)]
+pub struct LoadCommandData<'data, E: Endian> {
+    cmd: u32,
+    // Includes the header.
+    data: Bytes<'data>,
+    marker: PhantomData<E>,
+}
+
+impl<'data, E: Endian> LoadCommandData<'data, E> {
+    /// Return the `cmd` field of the [`macho::LoadCommand`].
+    ///
+    /// This is one of the `LC_` constants.
+    pub fn cmd(&self) -> u32 {
+        self.cmd
+    }
+
+    /// Return the `cmdsize` field of the [`macho::LoadCommand`].
+    pub fn cmdsize(&self) -> u32 {
+        self.data.len() as u32
+    }
+
+    /// Parse the data as the given type.
+    #[inline]
+    pub fn data<T: Pod>(&self) -> Result<&'data T> {
+        self.data
+            .read_at(0)
+            .read_error("Invalid Mach-O command size")
+    }
+
+    /// Raw bytes of this [`macho::LoadCommand`] structure.
+    pub fn raw_data(&self) -> &'data [u8] {
+        self.data.0
+    }
+
+    /// Parse a load command string value.
+    ///
+    /// Strings used by load commands are specified by offsets that are
+    /// relative to the load command header.
+    pub fn string(&self, endian: E, s: macho::LcStr<E>) -> Result<&'data [u8]> {
+        self.data
+            .read_string_at(s.offset.get(endian) as usize)
+            .read_error("Invalid load command string offset")
+    }
+
+    /// Parse the command data according to the `cmd` field.
+    pub fn variant(&self) -> Result<LoadCommandVariant<'data, E>> {
+        Ok(match self.cmd {
+            macho::LC_SEGMENT => {
+                let mut data = self.data;
+                let segment = data.read().read_error("Invalid Mach-O command size")?;
+                LoadCommandVariant::Segment32(segment, data.0)
+            }
+            macho::LC_SYMTAB => LoadCommandVariant::Symtab(self.data()?),
+            macho::LC_THREAD | macho::LC_UNIXTHREAD => {
+                let mut data = self.data;
+                let thread = data.read().read_error("Invalid Mach-O command size")?;
+                LoadCommandVariant::Thread(thread, data.0)
+            }
+            macho::LC_DYSYMTAB => LoadCommandVariant::Dysymtab(self.data()?),
+            macho::LC_LOAD_DYLIB
+            | macho::LC_LOAD_WEAK_DYLIB
+            | macho::LC_REEXPORT_DYLIB
+            | macho::LC_LAZY_LOAD_DYLIB
+            | macho::LC_LOAD_UPWARD_DYLIB => LoadCommandVariant::Dylib(self.data()?),
+            macho::LC_ID_DYLIB => LoadCommandVariant::IdDylib(self.data()?),
+            macho::LC_LOAD_DYLINKER => LoadCommandVariant::LoadDylinker(self.data()?),
+            macho::LC_ID_DYLINKER => LoadCommandVariant::IdDylinker(self.data()?),
+            macho::LC_PREBOUND_DYLIB => LoadCommandVariant::PreboundDylib(self.data()?),
+            macho::LC_ROUTINES => LoadCommandVariant::Routines32(self.data()?),
+            macho::LC_SUB_FRAMEWORK => LoadCommandVariant::SubFramework(self.data()?),
+            macho::LC_SUB_UMBRELLA => LoadCommandVariant::SubUmbrella(self.data()?),
+            macho::LC_SUB_CLIENT => LoadCommandVariant::SubClient(self.data()?),
+            macho::LC_SUB_LIBRARY => LoadCommandVariant::SubLibrary(self.data()?),
+            macho::LC_TWOLEVEL_HINTS => LoadCommandVariant::TwolevelHints(self.data()?),
+            macho::LC_PREBIND_CKSUM => LoadCommandVariant::PrebindCksum(self.data()?),
+            macho::LC_SEGMENT_64 => {
+                let mut data = self.data;
+                let segment = data.read().read_error("Invalid Mach-O command size")?;
+                LoadCommandVariant::Segment64(segment, data.0)
+            }
+            macho::LC_ROUTINES_64 => LoadCommandVariant::Routines64(self.data()?),
+            macho::LC_UUID => LoadCommandVariant::Uuid(self.data()?),
+            macho::LC_RPATH => LoadCommandVariant::Rpath(self.data()?),
+            macho::LC_CODE_SIGNATURE
+            | macho::LC_SEGMENT_SPLIT_INFO
+            | macho::LC_FUNCTION_STARTS
+            | macho::LC_DATA_IN_CODE
+            | macho::LC_DYLIB_CODE_SIGN_DRS
+            | macho::LC_LINKER_OPTIMIZATION_HINT
+            | macho::LC_DYLD_EXPORTS_TRIE
+            | macho::LC_DYLD_CHAINED_FIXUPS => LoadCommandVariant::LinkeditData(self.data()?),
+            macho::LC_ENCRYPTION_INFO => LoadCommandVariant::EncryptionInfo32(self.data()?),
+            macho::LC_DYLD_INFO | macho::LC_DYLD_INFO_ONLY => {
+                LoadCommandVariant::DyldInfo(self.data()?)
+            }
+            macho::LC_VERSION_MIN_MACOSX
+            | macho::LC_VERSION_MIN_IPHONEOS
+            | macho::LC_VERSION_MIN_TVOS
+            | macho::LC_VERSION_MIN_WATCHOS => LoadCommandVariant::VersionMin(self.data()?),
+            macho::LC_DYLD_ENVIRONMENT => LoadCommandVariant::DyldEnvironment(self.data()?),
+            macho::LC_MAIN => LoadCommandVariant::EntryPoint(self.data()?),
+            macho::LC_SOURCE_VERSION => LoadCommandVariant::SourceVersion(self.data()?),
+            macho::LC_ENCRYPTION_INFO_64 => LoadCommandVariant::EncryptionInfo64(self.data()?),
+            macho::LC_LINKER_OPTION => LoadCommandVariant::LinkerOption(self.data()?),
+            macho::LC_NOTE => LoadCommandVariant::Note(self.data()?),
+            macho::LC_BUILD_VERSION => LoadCommandVariant::BuildVersion(self.data()?),
+            macho::LC_FILESET_ENTRY => LoadCommandVariant::FilesetEntry(self.data()?),
+            _ => LoadCommandVariant::Other,
+        })
+    }
+
+    /// Try to parse this command as a [`macho::SegmentCommand32`].
+    ///
+    /// Returns the segment command and the data containing the sections.
+    pub fn segment_32(self) -> Result<Option<(&'data macho::SegmentCommand32<E>, &'data [u8])>> {
+        if self.cmd == macho::LC_SEGMENT {
+            let mut data = self.data;
+            let segment = data.read().read_error("Invalid Mach-O command size")?;
+            Ok(Some((segment, data.0)))
+        } else {
+            Ok(None)
+        }
+    }
+
+    /// Try to parse this command as a [`macho::SymtabCommand`].
+    ///
+    /// Returns the segment command and the data containing the sections.
+    pub fn symtab(self) -> Result<Option<&'data macho::SymtabCommand<E>>> {
+        if self.cmd == macho::LC_SYMTAB {
+            Some(self.data()).transpose()
+        } else {
+            Ok(None)
+        }
+    }
+
+    /// Try to parse this command as a [`macho::DysymtabCommand`].
+    pub fn dysymtab(self) -> Result<Option<&'data macho::DysymtabCommand<E>>> {
+        if self.cmd == macho::LC_DYSYMTAB {
+            Some(self.data()).transpose()
+        } else {
+            Ok(None)
+        }
+    }
+
+    /// Try to parse this command as a [`macho::DylibCommand`].
+    pub fn dylib(self) -> Result<Option<&'data macho::DylibCommand<E>>> {
+        if self.cmd == macho::LC_LOAD_DYLIB
+            || self.cmd == macho::LC_LOAD_WEAK_DYLIB
+            || self.cmd == macho::LC_REEXPORT_DYLIB
+            || self.cmd == macho::LC_LAZY_LOAD_DYLIB
+            || self.cmd == macho::LC_LOAD_UPWARD_DYLIB
+        {
+            Some(self.data()).transpose()
+        } else {
+            Ok(None)
+        }
+    }
+
+    /// Try to parse this command as a [`macho::UuidCommand`].
+    pub fn uuid(self) -> Result<Option<&'data macho::UuidCommand<E>>> {
+        if self.cmd == macho::LC_UUID {
+            Some(self.data()).transpose()
+        } else {
+            Ok(None)
+        }
+    }
+
+    /// Try to parse this command as a [`macho::SegmentCommand64`].
+    pub fn segment_64(self) -> Result<Option<(&'data macho::SegmentCommand64<E>, &'data [u8])>> {
+        if self.cmd == macho::LC_SEGMENT_64 {
+            let mut data = self.data;
+            let command = data.read().read_error("Invalid Mach-O command size")?;
+            Ok(Some((command, data.0)))
+        } else {
+            Ok(None)
+        }
+    }
+
+    /// Try to parse this command as a [`macho::DyldInfoCommand`].
+    pub fn dyld_info(self) -> Result<Option<&'data macho::DyldInfoCommand<E>>> {
+        if self.cmd == macho::LC_DYLD_INFO || self.cmd == macho::LC_DYLD_INFO_ONLY {
+            Some(self.data()).transpose()
+        } else {
+            Ok(None)
+        }
+    }
+
+    /// Try to parse this command as an [`macho::EntryPointCommand`].
+    pub fn entry_point(self) -> Result<Option<&'data macho::EntryPointCommand<E>>> {
+        if self.cmd == macho::LC_MAIN {
+            Some(self.data()).transpose()
+        } else {
+            Ok(None)
+        }
+    }
+
+    /// Try to parse this command as a [`macho::BuildVersionCommand`].
+    pub fn build_version(self) -> Result<Option<&'data macho::BuildVersionCommand<E>>> {
+        if self.cmd == macho::LC_BUILD_VERSION {
+            Some(self.data()).transpose()
+        } else {
+            Ok(None)
+        }
+    }
+}
+
+/// A [`macho::LoadCommand`] that has been interpreted according to its `cmd` field.
+#[derive(Debug, Clone, Copy)]
+#[non_exhaustive]
+pub enum LoadCommandVariant<'data, E: Endian> {
+    /// `LC_SEGMENT`
+    Segment32(&'data macho::SegmentCommand32<E>, &'data [u8]),
+    /// `LC_SYMTAB`
+    Symtab(&'data macho::SymtabCommand<E>),
+    // obsolete: `LC_SYMSEG`
+    //Symseg(&'data macho::SymsegCommand<E>),
+    /// `LC_THREAD` or `LC_UNIXTHREAD`
+    Thread(&'data macho::ThreadCommand<E>, &'data [u8]),
+    // obsolete: `LC_IDFVMLIB` or `LC_LOADFVMLIB`
+    //Fvmlib(&'data macho::FvmlibCommand<E>),
+    // obsolete: `LC_IDENT`
+    //Ident(&'data macho::IdentCommand<E>),
+    // internal: `LC_FVMFILE`
+    //Fvmfile(&'data macho::FvmfileCommand<E>),
+    // internal: `LC_PREPAGE`
+    /// `LC_DYSYMTAB`
+    Dysymtab(&'data macho::DysymtabCommand<E>),
+    /// `LC_LOAD_DYLIB`, `LC_LOAD_WEAK_DYLIB`, `LC_REEXPORT_DYLIB`,
+    /// `LC_LAZY_LOAD_DYLIB`, or `LC_LOAD_UPWARD_DYLIB`
+    Dylib(&'data macho::DylibCommand<E>),
+    /// `LC_ID_DYLIB`
+    IdDylib(&'data macho::DylibCommand<E>),
+    /// `LC_LOAD_DYLINKER`
+    LoadDylinker(&'data macho::DylinkerCommand<E>),
+    /// `LC_ID_DYLINKER`
+    IdDylinker(&'data macho::DylinkerCommand<E>),
+    /// `LC_PREBOUND_DYLIB`
+    PreboundDylib(&'data macho::PreboundDylibCommand<E>),
+    /// `LC_ROUTINES`
+    Routines32(&'data macho::RoutinesCommand32<E>),
+    /// `LC_SUB_FRAMEWORK`
+    SubFramework(&'data macho::SubFrameworkCommand<E>),
+    /// `LC_SUB_UMBRELLA`
+    SubUmbrella(&'data macho::SubUmbrellaCommand<E>),
+    /// `LC_SUB_CLIENT`
+    SubClient(&'data macho::SubClientCommand<E>),
+    /// `LC_SUB_LIBRARY`
+    SubLibrary(&'data macho::SubLibraryCommand<E>),
+    /// `LC_TWOLEVEL_HINTS`
+    TwolevelHints(&'data macho::TwolevelHintsCommand<E>),
+    /// `LC_PREBIND_CKSUM`
+    PrebindCksum(&'data macho::PrebindCksumCommand<E>),
+    /// `LC_SEGMENT_64`
+    Segment64(&'data macho::SegmentCommand64<E>, &'data [u8]),
+    /// `LC_ROUTINES_64`
+    Routines64(&'data macho::RoutinesCommand64<E>),
+    /// `LC_UUID`
+    Uuid(&'data macho::UuidCommand<E>),
+    /// `LC_RPATH`
+    Rpath(&'data macho::RpathCommand<E>),
+    /// `LC_CODE_SIGNATURE`, `LC_SEGMENT_SPLIT_INFO`, `LC_FUNCTION_STARTS`,
+    /// `LC_DATA_IN_CODE`, `LC_DYLIB_CODE_SIGN_DRS`, `LC_LINKER_OPTIMIZATION_HINT`,
+    /// `LC_DYLD_EXPORTS_TRIE`, or `LC_DYLD_CHAINED_FIXUPS`.
+    LinkeditData(&'data macho::LinkeditDataCommand<E>),
+    /// `LC_ENCRYPTION_INFO`
+    EncryptionInfo32(&'data macho::EncryptionInfoCommand32<E>),
+    /// `LC_DYLD_INFO` or `LC_DYLD_INFO_ONLY`
+    DyldInfo(&'data macho::DyldInfoCommand<E>),
+    /// `LC_VERSION_MIN_MACOSX`, `LC_VERSION_MIN_IPHONEOS`, `LC_VERSION_MIN_WATCHOS`,
+    /// or `LC_VERSION_MIN_TVOS`
+    VersionMin(&'data macho::VersionMinCommand<E>),
+    /// `LC_DYLD_ENVIRONMENT`
+    DyldEnvironment(&'data macho::DylinkerCommand<E>),
+    /// `LC_MAIN`
+    EntryPoint(&'data macho::EntryPointCommand<E>),
+    /// `LC_SOURCE_VERSION`
+    SourceVersion(&'data macho::SourceVersionCommand<E>),
+    /// `LC_ENCRYPTION_INFO_64`
+    EncryptionInfo64(&'data macho::EncryptionInfoCommand64<E>),
+    /// `LC_LINKER_OPTION`
+    LinkerOption(&'data macho::LinkerOptionCommand<E>),
+    /// `LC_NOTE`
+    Note(&'data macho::NoteCommand<E>),
+    /// `LC_BUILD_VERSION`
+    BuildVersion(&'data macho::BuildVersionCommand<E>),
+    /// `LC_FILESET_ENTRY`
+    FilesetEntry(&'data macho::FilesetEntryCommand<E>),
+    /// An unrecognized or obsolete load command.
+    Other,
+}
+
+impl<E: Endian> macho::SymtabCommand<E> {
+    /// Return the symbol table that this command references.
+    pub fn symbols<'data, Mach: MachHeader<Endian = E>, R: ReadRef<'data>>(
+        &self,
+        endian: E,
+        data: R,
+    ) -> Result<SymbolTable<'data, Mach, R>> {
+        let symbols = data
+            .read_slice_at(
+                self.symoff.get(endian).into(),
+                self.nsyms.get(endian) as usize,
+            )
+            .read_error("Invalid Mach-O symbol table offset or size")?;
+        let str_start: u64 = self.stroff.get(endian).into();
+        let str_end = str_start
+            .checked_add(self.strsize.get(endian).into())
+            .read_error("Invalid Mach-O string table length")?;
+        let strings = StringTable::new(data, str_start, str_end);
+        Ok(SymbolTable::new(symbols, strings))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::LittleEndian;
+
+    #[test]
+    fn cmd_size_invalid() {
+        let mut commands = LoadCommandIterator::new(LittleEndian, &[0; 8], 10);
+        assert!(commands.next().is_err());
+        let mut commands = LoadCommandIterator::new(LittleEndian, &[0, 0, 0, 0, 7, 0, 0, 0, 0], 10);
+        assert!(commands.next().is_err());
+        let mut commands = LoadCommandIterator::new(LittleEndian, &[0, 0, 0, 0, 8, 0, 0, 0, 0], 10);
+        assert!(commands.next().is_ok());
+    }
+}

vendor/object/src/read/macho/mod.rs

@@ -0,0 +1,72 @@
+//! Support for reading Mach-O files.
+//!
+//! Traits are used to abstract over the difference between 32-bit and 64-bit Mach-O
+//! files. The primary trait for this is [`MachHeader`].
+//!
+//! ## High level API
+//!
+//! [`MachOFile`] implements the [`Object`](crate::read::Object) trait for Mach-O files.
+//! [`MachOFile`] is parameterised by [`MachHeader`] to allow reading both 32-bit and
+//! 64-bit Mach-O files. There are type aliases for these parameters ([`MachOFile32`] and
+//! [`MachOFile64`]).
+//!
+//! ## Low level API
+//!
+//! The [`MachHeader`] trait can be directly used to parse both [`macho::MachHeader32`]
+//! and [`macho::MachHeader64`]. Additionally, [`FatHeader`] and the [`FatArch`] trait
+//! can be used to iterate images in multi-architecture binaries, and [`DyldCache`] can
+//! be used to locate images in a dyld shared cache.
+//!
+//! ### Example for low level API
+//!  ```no_run
+//! use object::macho;
+//! use object::read::macho::{MachHeader, Nlist};
+//! use std::error::Error;
+//! use std::fs;
+//!
+//! /// Reads a file and displays the name of each symbol.
+//! fn main() -> Result<(), Box<dyn Error>> {
+//! #   #[cfg(feature = "std")] {
+//!     let data = fs::read("path/to/binary")?;
+//!     let header = macho::MachHeader64::<object::Endianness>::parse(&*data, 0)?;
+//!     let endian = header.endian()?;
+//!     let mut commands = header.load_commands(endian, &*data, 0)?;
+//!     while let Some(command) = commands.next()? {
+//!         if let Some(symtab_command) = command.symtab()? {
+//!             let symbols = symtab_command.symbols::<macho::MachHeader64<_>, _>(endian, &*data)?;
+//!             for symbol in symbols.iter() {
+//!                 let name = symbol.name(endian, symbols.strings())?;
+//!                 println!("{}", String::from_utf8_lossy(name));
+//!             }
+//!         }
+//!     }
+//! #   }
+//!     Ok(())
+//! }
+//! ```
+#[cfg(doc)]
+use crate::macho;
+
+mod dyld_cache;
+pub use dyld_cache::*;
+
+mod fat;
+pub use fat::*;
+
+mod file;
+pub use file::*;
+
+mod load_command;
+pub use load_command::*;
+
+mod segment;
+pub use segment::*;
+
+mod section;
+pub use section::*;
+
+mod symbol;
+pub use symbol::*;
+
+mod relocation;
+pub use relocation::*;

vendor/object/src/read/macho/relocation.rs

@@ -0,0 +1,158 @@
+use core::{fmt, slice};
+
+use crate::endian::Endianness;
+use crate::macho;
+use crate::read::{
+    ReadRef, Relocation, RelocationEncoding, RelocationKind, RelocationTarget, SectionIndex,
+    SymbolIndex,
+};
+
+use super::{MachHeader, MachOFile};
+
+/// An iterator for the relocations in a [`MachOSection32`](super::MachOSection32).
+pub type MachORelocationIterator32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachORelocationIterator<'data, 'file, macho::MachHeader32<Endian>, R>;
+/// An iterator for the relocations in a [`MachOSection64`](super::MachOSection64).
+pub type MachORelocationIterator64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachORelocationIterator<'data, 'file, macho::MachHeader64<Endian>, R>;
+
+/// An iterator for the relocations in a [`MachOSection`](super::MachOSection).
+pub struct MachORelocationIterator<'data, 'file, Mach, R = &'data [u8]>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) file: &'file MachOFile<'data, Mach, R>,
+    pub(super) relocations: slice::Iter<'data, macho::Relocation<Mach::Endian>>,
+}
+
+impl<'data, 'file, Mach, R> Iterator for MachORelocationIterator<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    type Item = (u64, Relocation);
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let mut paired_addend = 0;
+        loop {
+            let reloc = self.relocations.next()?;
+            let endian = self.file.endian;
+            let cputype = self.file.header.cputype(endian);
+            if reloc.r_scattered(endian, cputype) {
+                // FIXME: handle scattered relocations
+                // We need to add `RelocationTarget::Address` for this.
+                continue;
+            }
+            let reloc = reloc.info(self.file.endian);
+            let mut encoding = RelocationEncoding::Generic;
+            let kind = match cputype {
+                macho::CPU_TYPE_ARM => match (reloc.r_type, reloc.r_pcrel) {
+                    (macho::ARM_RELOC_VANILLA, false) => RelocationKind::Absolute,
+                    _ => RelocationKind::MachO {
+                        value: reloc.r_type,
+                        relative: reloc.r_pcrel,
+                    },
+                },
+                macho::CPU_TYPE_ARM64 | macho::CPU_TYPE_ARM64_32 => {
+                    match (reloc.r_type, reloc.r_pcrel) {
+                        (macho::ARM64_RELOC_UNSIGNED, false) => RelocationKind::Absolute,
+                        (macho::ARM64_RELOC_ADDEND, _) => {
+                            paired_addend = i64::from(reloc.r_symbolnum)
+                                .wrapping_shl(64 - 24)
+                                .wrapping_shr(64 - 24);
+                            continue;
+                        }
+                        _ => RelocationKind::MachO {
+                            value: reloc.r_type,
+                            relative: reloc.r_pcrel,
+                        },
+                    }
+                }
+                macho::CPU_TYPE_X86 => match (reloc.r_type, reloc.r_pcrel) {
+                    (macho::GENERIC_RELOC_VANILLA, false) => RelocationKind::Absolute,
+                    _ => RelocationKind::MachO {
+                        value: reloc.r_type,
+                        relative: reloc.r_pcrel,
+                    },
+                },
+                macho::CPU_TYPE_X86_64 => match (reloc.r_type, reloc.r_pcrel) {
+                    (macho::X86_64_RELOC_UNSIGNED, false) => RelocationKind::Absolute,
+                    (macho::X86_64_RELOC_SIGNED, true) => {
+                        encoding = RelocationEncoding::X86RipRelative;
+                        RelocationKind::Relative
+                    }
+                    (macho::X86_64_RELOC_BRANCH, true) => {
+                        encoding = RelocationEncoding::X86Branch;
+                        RelocationKind::Relative
+                    }
+                    (macho::X86_64_RELOC_GOT, true) => RelocationKind::GotRelative,
+                    (macho::X86_64_RELOC_GOT_LOAD, true) => {
+                        encoding = RelocationEncoding::X86RipRelativeMovq;
+                        RelocationKind::GotRelative
+                    }
+                    _ => RelocationKind::MachO {
+                        value: reloc.r_type,
+                        relative: reloc.r_pcrel,
+                    },
+                },
+                _ => RelocationKind::MachO {
+                    value: reloc.r_type,
+                    relative: reloc.r_pcrel,
+                },
+            };
+            let size = 8 << reloc.r_length;
+            let target = if reloc.r_extern {
+                RelocationTarget::Symbol(SymbolIndex(reloc.r_symbolnum as usize))
+            } else {
+                RelocationTarget::Section(SectionIndex(reloc.r_symbolnum as usize))
+            };
+            let implicit_addend = paired_addend == 0;
+            let mut addend = paired_addend;
+            if reloc.r_pcrel {
+                // For PC relative relocations on some architectures, the
+                // addend does not include the offset required due to the
+                // PC being different from the place of the relocation.
+                // This differs from other file formats, so adjust the
+                // addend here to account for this.
+                match cputype {
+                    macho::CPU_TYPE_X86 => {
+                        addend -= 1 << reloc.r_length;
+                    }
+                    macho::CPU_TYPE_X86_64 => {
+                        addend -= 1 << reloc.r_length;
+                        match reloc.r_type {
+                            macho::X86_64_RELOC_SIGNED_1 => addend -= 1,
+                            macho::X86_64_RELOC_SIGNED_2 => addend -= 2,
+                            macho::X86_64_RELOC_SIGNED_4 => addend -= 4,
+                            _ => {}
+                        }
+                    }
+                    // TODO: maybe missing support for some architectures and relocations
+                    _ => {}
+                }
+            }
+            return Some((
+                reloc.r_address as u64,
+                Relocation {
+                    kind,
+                    encoding,
+                    size,
+                    target,
+                    addend,
+                    implicit_addend,
+                },
+            ));
+        }
+    }
+}
+
+impl<'data, 'file, Mach, R> fmt::Debug for MachORelocationIterator<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("MachORelocationIterator").finish()
+    }
+}

vendor/object/src/read/macho/section.rs

@@ -0,0 +1,389 @@
+use core::fmt::Debug;
+use core::{fmt, result, slice, str};
+
+use crate::endian::{self, Endianness};
+use crate::macho;
+use crate::pod::Pod;
+use crate::read::{
+    self, CompressedData, CompressedFileRange, ObjectSection, ReadError, ReadRef, Result,
+    SectionFlags, SectionIndex, SectionKind,
+};
+
+use super::{MachHeader, MachOFile, MachORelocationIterator};
+
+/// An iterator for the sections in a [`MachOFile32`](super::MachOFile32).
+pub type MachOSectionIterator32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOSectionIterator<'data, 'file, macho::MachHeader32<Endian>, R>;
+/// An iterator for the sections in a [`MachOFile64`](super::MachOFile64).
+pub type MachOSectionIterator64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOSectionIterator<'data, 'file, macho::MachHeader64<Endian>, R>;
+
+/// An iterator for the sections in a [`MachOFile`].
+pub struct MachOSectionIterator<'data, 'file, Mach, R = &'data [u8]>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) file: &'file MachOFile<'data, Mach, R>,
+    pub(super) iter: slice::Iter<'file, MachOSectionInternal<'data, Mach>>,
+}
+
+impl<'data, 'file, Mach, R> fmt::Debug for MachOSectionIterator<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        // It's painful to do much better than this
+        f.debug_struct("MachOSectionIterator").finish()
+    }
+}
+
+impl<'data, 'file, Mach, R> Iterator for MachOSectionIterator<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    type Item = MachOSection<'data, 'file, Mach, R>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.iter.next().map(|&internal| MachOSection {
+            file: self.file,
+            internal,
+        })
+    }
+}
+
+/// A section in a [`MachOFile32`](super::MachOFile32).
+pub type MachOSection32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOSection<'data, 'file, macho::MachHeader32<Endian>, R>;
+/// A section in a [`MachOFile64`](super::MachOFile64).
+pub type MachOSection64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOSection<'data, 'file, macho::MachHeader64<Endian>, R>;
+
+/// A section in a [`MachOFile`].
+///
+/// Most functionality is provided by the [`ObjectSection`] trait implementation.
+#[derive(Debug)]
+pub struct MachOSection<'data, 'file, Mach, R = &'data [u8]>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) file: &'file MachOFile<'data, Mach, R>,
+    pub(super) internal: MachOSectionInternal<'data, Mach>,
+}
+
+impl<'data, 'file, Mach, R> MachOSection<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    fn bytes(&self) -> Result<&'data [u8]> {
+        let segment_index = self.internal.segment_index;
+        let segment = self.file.segment_internal(segment_index)?;
+        self.internal
+            .section
+            .data(self.file.endian, segment.data)
+            .read_error("Invalid Mach-O section size or offset")
+    }
+}
+
+impl<'data, 'file, Mach, R> read::private::Sealed for MachOSection<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+}
+
+impl<'data, 'file, Mach, R> ObjectSection<'data> for MachOSection<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    type RelocationIterator = MachORelocationIterator<'data, 'file, Mach, R>;
+
+    #[inline]
+    fn index(&self) -> SectionIndex {
+        self.internal.index
+    }
+
+    #[inline]
+    fn address(&self) -> u64 {
+        self.internal.section.addr(self.file.endian).into()
+    }
+
+    #[inline]
+    fn size(&self) -> u64 {
+        self.internal.section.size(self.file.endian).into()
+    }
+
+    #[inline]
+    fn align(&self) -> u64 {
+        let align = self.internal.section.align(self.file.endian);
+        if align < 64 {
+            1 << align
+        } else {
+            0
+        }
+    }
+
+    #[inline]
+    fn file_range(&self) -> Option<(u64, u64)> {
+        self.internal.section.file_range(self.file.endian)
+    }
+
+    #[inline]
+    fn data(&self) -> Result<&'data [u8]> {
+        self.bytes()
+    }
+
+    fn data_range(&self, address: u64, size: u64) -> Result<Option<&'data [u8]>> {
+        Ok(read::util::data_range(
+            self.bytes()?,
+            self.address(),
+            address,
+            size,
+        ))
+    }
+
+    #[inline]
+    fn compressed_file_range(&self) -> Result<CompressedFileRange> {
+        Ok(CompressedFileRange::none(self.file_range()))
+    }
+
+    #[inline]
+    fn compressed_data(&self) -> Result<CompressedData<'data>> {
+        self.data().map(CompressedData::none)
+    }
+
+    #[inline]
+    fn name_bytes(&self) -> Result<&[u8]> {
+        Ok(self.internal.section.name())
+    }
+
+    #[inline]
+    fn name(&self) -> Result<&str> {
+        str::from_utf8(self.internal.section.name())
+            .ok()
+            .read_error("Non UTF-8 Mach-O section name")
+    }
+
+    #[inline]
+    fn segment_name_bytes(&self) -> Result<Option<&[u8]>> {
+        Ok(Some(self.internal.section.segment_name()))
+    }
+
+    #[inline]
+    fn segment_name(&self) -> Result<Option<&str>> {
+        Ok(Some(
+            str::from_utf8(self.internal.section.segment_name())
+                .ok()
+                .read_error("Non UTF-8 Mach-O segment name")?,
+        ))
+    }
+
+    fn kind(&self) -> SectionKind {
+        self.internal.kind
+    }
+
+    fn relocations(&self) -> MachORelocationIterator<'data, 'file, Mach, R> {
+        MachORelocationIterator {
+            file: self.file,
+            relocations: self
+                .internal
+                .section
+                .relocations(self.file.endian, self.file.data)
+                .unwrap_or(&[])
+                .iter(),
+        }
+    }
+
+    fn flags(&self) -> SectionFlags {
+        SectionFlags::MachO {
+            flags: self.internal.section.flags(self.file.endian),
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy)]
+pub(super) struct MachOSectionInternal<'data, Mach: MachHeader> {
+    pub index: SectionIndex,
+    pub segment_index: usize,
+    pub kind: SectionKind,
+    pub section: &'data Mach::Section,
+}
+
+impl<'data, Mach: MachHeader> MachOSectionInternal<'data, Mach> {
+    pub(super) fn parse(
+        index: SectionIndex,
+        segment_index: usize,
+        section: &'data Mach::Section,
+    ) -> Self {
+        // TODO: we don't validate flags, should we?
+        let kind = match (section.segment_name(), section.name()) {
+            (b"__TEXT", b"__text") => SectionKind::Text,
+            (b"__TEXT", b"__const") => SectionKind::ReadOnlyData,
+            (b"__TEXT", b"__cstring") => SectionKind::ReadOnlyString,
+            (b"__TEXT", b"__literal4") => SectionKind::ReadOnlyData,
+            (b"__TEXT", b"__literal8") => SectionKind::ReadOnlyData,
+            (b"__TEXT", b"__literal16") => SectionKind::ReadOnlyData,
+            (b"__TEXT", b"__eh_frame") => SectionKind::ReadOnlyData,
+            (b"__TEXT", b"__gcc_except_tab") => SectionKind::ReadOnlyData,
+            (b"__DATA", b"__data") => SectionKind::Data,
+            (b"__DATA", b"__const") => SectionKind::ReadOnlyData,
+            (b"__DATA", b"__bss") => SectionKind::UninitializedData,
+            (b"__DATA", b"__common") => SectionKind::Common,
+            (b"__DATA", b"__thread_data") => SectionKind::Tls,
+            (b"__DATA", b"__thread_bss") => SectionKind::UninitializedTls,
+            (b"__DATA", b"__thread_vars") => SectionKind::TlsVariables,
+            (b"__DWARF", _) => SectionKind::Debug,
+            _ => SectionKind::Unknown,
+        };
+        MachOSectionInternal {
+            index,
+            segment_index,
+            kind,
+            section,
+        }
+    }
+}
+
+/// A trait for generic access to [`macho::Section32`] and [`macho::Section64`].
+#[allow(missing_docs)]
+pub trait Section: Debug + Pod {
+    type Word: Into<u64>;
+    type Endian: endian::Endian;
+
+    fn sectname(&self) -> &[u8; 16];
+    fn segname(&self) -> &[u8; 16];
+    fn addr(&self, endian: Self::Endian) -> Self::Word;
+    fn size(&self, endian: Self::Endian) -> Self::Word;
+    fn offset(&self, endian: Self::Endian) -> u32;
+    fn align(&self, endian: Self::Endian) -> u32;
+    fn reloff(&self, endian: Self::Endian) -> u32;
+    fn nreloc(&self, endian: Self::Endian) -> u32;
+    fn flags(&self, endian: Self::Endian) -> u32;
+
+    /// Return the `sectname` bytes up until the null terminator.
+    fn name(&self) -> &[u8] {
+        let sectname = &self.sectname()[..];
+        match memchr::memchr(b'\0', sectname) {
+            Some(end) => &sectname[..end],
+            None => sectname,
+        }
+    }
+
+    /// Return the `segname` bytes up until the null terminator.
+    fn segment_name(&self) -> &[u8] {
+        let segname = &self.segname()[..];
+        match memchr::memchr(b'\0', segname) {
+            Some(end) => &segname[..end],
+            None => segname,
+        }
+    }
+
+    /// Return the offset and size of the section in the file.
+    ///
+    /// Returns `None` for sections that have no data in the file.
+    fn file_range(&self, endian: Self::Endian) -> Option<(u64, u64)> {
+        match self.flags(endian) & macho::SECTION_TYPE {
+            macho::S_ZEROFILL | macho::S_GB_ZEROFILL | macho::S_THREAD_LOCAL_ZEROFILL => None,
+            _ => Some((self.offset(endian).into(), self.size(endian).into())),
+        }
+    }
+
+    /// Return the section data.
+    ///
+    /// Returns `Ok(&[])` if the section has no data.
+    /// Returns `Err` for invalid values.
+    fn data<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Self::Endian,
+        data: R,
+    ) -> result::Result<&'data [u8], ()> {
+        if let Some((offset, size)) = self.file_range(endian) {
+            data.read_bytes_at(offset, size)
+        } else {
+            Ok(&[])
+        }
+    }
+
+    /// Return the relocation array.
+    ///
+    /// Returns `Err` for invalid values.
+    fn relocations<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Self::Endian,
+        data: R,
+    ) -> Result<&'data [macho::Relocation<Self::Endian>]> {
+        data.read_slice_at(self.reloff(endian).into(), self.nreloc(endian) as usize)
+            .read_error("Invalid Mach-O relocations offset or number")
+    }
+}
+
+impl<Endian: endian::Endian> Section for macho::Section32<Endian> {
+    type Word = u32;
+    type Endian = Endian;
+
+    fn sectname(&self) -> &[u8; 16] {
+        &self.sectname
+    }
+    fn segname(&self) -> &[u8; 16] {
+        &self.segname
+    }
+    fn addr(&self, endian: Self::Endian) -> Self::Word {
+        self.addr.get(endian)
+    }
+    fn size(&self, endian: Self::Endian) -> Self::Word {
+        self.size.get(endian)
+    }
+    fn offset(&self, endian: Self::Endian) -> u32 {
+        self.offset.get(endian)
+    }
+    fn align(&self, endian: Self::Endian) -> u32 {
+        self.align.get(endian)
+    }
+    fn reloff(&self, endian: Self::Endian) -> u32 {
+        self.reloff.get(endian)
+    }
+    fn nreloc(&self, endian: Self::Endian) -> u32 {
+        self.nreloc.get(endian)
+    }
+    fn flags(&self, endian: Self::Endian) -> u32 {
+        self.flags.get(endian)
+    }
+}
+
+impl<Endian: endian::Endian> Section for macho::Section64<Endian> {
+    type Word = u64;
+    type Endian = Endian;
+
+    fn sectname(&self) -> &[u8; 16] {
+        &self.sectname
+    }
+    fn segname(&self) -> &[u8; 16] {
+        &self.segname
+    }
+    fn addr(&self, endian: Self::Endian) -> Self::Word {
+        self.addr.get(endian)
+    }
+    fn size(&self, endian: Self::Endian) -> Self::Word {
+        self.size.get(endian)
+    }
+    fn offset(&self, endian: Self::Endian) -> u32 {
+        self.offset.get(endian)
+    }
+    fn align(&self, endian: Self::Endian) -> u32 {
+        self.align.get(endian)
+    }
+    fn reloff(&self, endian: Self::Endian) -> u32 {
+        self.reloff.get(endian)
+    }
+    fn nreloc(&self, endian: Self::Endian) -> u32 {
+        self.nreloc.get(endian)
+    }
+    fn flags(&self, endian: Self::Endian) -> u32 {
+        self.flags.get(endian)
+    }
+}

vendor/object/src/read/macho/segment.rs

@@ -0,0 +1,303 @@
+use core::fmt::Debug;
+use core::{result, slice, str};
+
+use crate::endian::{self, Endianness};
+use crate::macho;
+use crate::pod::Pod;
+use crate::read::{self, ObjectSegment, ReadError, ReadRef, Result, SegmentFlags};
+
+use super::{LoadCommandData, MachHeader, MachOFile, Section};
+
+/// An iterator for the segments in a [`MachOFile32`](super::MachOFile32).
+pub type MachOSegmentIterator32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOSegmentIterator<'data, 'file, macho::MachHeader32<Endian>, R>;
+/// An iterator for the segments in a [`MachOFile64`](super::MachOFile64).
+pub type MachOSegmentIterator64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOSegmentIterator<'data, 'file, macho::MachHeader64<Endian>, R>;
+
+/// An iterator for the segments in a [`MachOFile`].
+#[derive(Debug)]
+pub struct MachOSegmentIterator<'data, 'file, Mach, R = &'data [u8]>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) file: &'file MachOFile<'data, Mach, R>,
+    pub(super) iter: slice::Iter<'file, MachOSegmentInternal<'data, Mach, R>>,
+}
+
+impl<'data, 'file, Mach, R> Iterator for MachOSegmentIterator<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    type Item = MachOSegment<'data, 'file, Mach, R>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.iter.next().map(|internal| MachOSegment {
+            file: self.file,
+            internal,
+        })
+    }
+}
+
+/// A segment in a [`MachOFile32`](super::MachOFile32).
+pub type MachOSegment32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOSegment<'data, 'file, macho::MachHeader32<Endian>, R>;
+/// A segment in a [`MachOFile64`](super::MachOFile64).
+pub type MachOSegment64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOSegment<'data, 'file, macho::MachHeader64<Endian>, R>;
+
+/// A segment in a [`MachOFile`].
+///
+/// Most functionality is provided by the [`ObjectSegment`] trait implementation.
+#[derive(Debug)]
+pub struct MachOSegment<'data, 'file, Mach, R = &'data [u8]>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    file: &'file MachOFile<'data, Mach, R>,
+    internal: &'file MachOSegmentInternal<'data, Mach, R>,
+}
+
+impl<'data, 'file, Mach, R> MachOSegment<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    fn bytes(&self) -> Result<&'data [u8]> {
+        self.internal
+            .segment
+            .data(self.file.endian, self.file.data)
+            .read_error("Invalid Mach-O segment size or offset")
+    }
+}
+
+impl<'data, 'file, Mach, R> read::private::Sealed for MachOSegment<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+}
+
+impl<'data, 'file, Mach, R> ObjectSegment<'data> for MachOSegment<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    #[inline]
+    fn address(&self) -> u64 {
+        self.internal.segment.vmaddr(self.file.endian).into()
+    }
+
+    #[inline]
+    fn size(&self) -> u64 {
+        self.internal.segment.vmsize(self.file.endian).into()
+    }
+
+    #[inline]
+    fn align(&self) -> u64 {
+        // Page size.
+        0x1000
+    }
+
+    #[inline]
+    fn file_range(&self) -> (u64, u64) {
+        self.internal.segment.file_range(self.file.endian)
+    }
+
+    fn data(&self) -> Result<&'data [u8]> {
+        self.bytes()
+    }
+
+    fn data_range(&self, address: u64, size: u64) -> Result<Option<&'data [u8]>> {
+        Ok(read::util::data_range(
+            self.bytes()?,
+            self.address(),
+            address,
+            size,
+        ))
+    }
+
+    #[inline]
+    fn name_bytes(&self) -> Result<Option<&[u8]>> {
+        Ok(Some(self.internal.segment.name()))
+    }
+
+    #[inline]
+    fn name(&self) -> Result<Option<&str>> {
+        Ok(Some(
+            str::from_utf8(self.internal.segment.name())
+                .ok()
+                .read_error("Non UTF-8 Mach-O segment name")?,
+        ))
+    }
+
+    #[inline]
+    fn flags(&self) -> SegmentFlags {
+        let flags = self.internal.segment.flags(self.file.endian);
+        let maxprot = self.internal.segment.maxprot(self.file.endian);
+        let initprot = self.internal.segment.initprot(self.file.endian);
+        SegmentFlags::MachO {
+            flags,
+            maxprot,
+            initprot,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy)]
+pub(super) struct MachOSegmentInternal<'data, Mach: MachHeader, R: ReadRef<'data>> {
+    pub data: R,
+    pub segment: &'data Mach::Segment,
+}
+
+/// A trait for generic access to [`macho::SegmentCommand32`] and [`macho::SegmentCommand64`].
+#[allow(missing_docs)]
+pub trait Segment: Debug + Pod {
+    type Word: Into<u64>;
+    type Endian: endian::Endian;
+    type Section: Section<Endian = Self::Endian>;
+
+    fn from_command(command: LoadCommandData<'_, Self::Endian>) -> Result<Option<(&Self, &[u8])>>;
+
+    fn cmd(&self, endian: Self::Endian) -> u32;
+    fn cmdsize(&self, endian: Self::Endian) -> u32;
+    fn segname(&self) -> &[u8; 16];
+    fn vmaddr(&self, endian: Self::Endian) -> Self::Word;
+    fn vmsize(&self, endian: Self::Endian) -> Self::Word;
+    fn fileoff(&self, endian: Self::Endian) -> Self::Word;
+    fn filesize(&self, endian: Self::Endian) -> Self::Word;
+    fn maxprot(&self, endian: Self::Endian) -> u32;
+    fn initprot(&self, endian: Self::Endian) -> u32;
+    fn nsects(&self, endian: Self::Endian) -> u32;
+    fn flags(&self, endian: Self::Endian) -> u32;
+
+    /// Return the `segname` bytes up until the null terminator.
+    fn name(&self) -> &[u8] {
+        let segname = &self.segname()[..];
+        match memchr::memchr(b'\0', segname) {
+            Some(end) => &segname[..end],
+            None => segname,
+        }
+    }
+
+    /// Return the offset and size of the segment in the file.
+    fn file_range(&self, endian: Self::Endian) -> (u64, u64) {
+        (self.fileoff(endian).into(), self.filesize(endian).into())
+    }
+
+    /// Get the segment data from the file data.
+    ///
+    /// Returns `Err` for invalid values.
+    fn data<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Self::Endian,
+        data: R,
+    ) -> result::Result<&'data [u8], ()> {
+        let (offset, size) = self.file_range(endian);
+        data.read_bytes_at(offset, size)
+    }
+
+    /// Get the array of sections from the data following the segment command.
+    ///
+    /// Returns `Err` for invalid values.
+    fn sections<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Self::Endian,
+        section_data: R,
+    ) -> Result<&'data [Self::Section]> {
+        section_data
+            .read_slice_at(0, self.nsects(endian) as usize)
+            .read_error("Invalid Mach-O number of sections")
+    }
+}
+
+impl<Endian: endian::Endian> Segment for macho::SegmentCommand32<Endian> {
+    type Word = u32;
+    type Endian = Endian;
+    type Section = macho::Section32<Self::Endian>;
+
+    fn from_command(command: LoadCommandData<'_, Self::Endian>) -> Result<Option<(&Self, &[u8])>> {
+        command.segment_32()
+    }
+
+    fn cmd(&self, endian: Self::Endian) -> u32 {
+        self.cmd.get(endian)
+    }
+    fn cmdsize(&self, endian: Self::Endian) -> u32 {
+        self.cmdsize.get(endian)
+    }
+    fn segname(&self) -> &[u8; 16] {
+        &self.segname
+    }
+    fn vmaddr(&self, endian: Self::Endian) -> Self::Word {
+        self.vmaddr.get(endian)
+    }
+    fn vmsize(&self, endian: Self::Endian) -> Self::Word {
+        self.vmsize.get(endian)
+    }
+    fn fileoff(&self, endian: Self::Endian) -> Self::Word {
+        self.fileoff.get(endian)
+    }
+    fn filesize(&self, endian: Self::Endian) -> Self::Word {
+        self.filesize.get(endian)
+    }
+    fn maxprot(&self, endian: Self::Endian) -> u32 {
+        self.maxprot.get(endian)
+    }
+    fn initprot(&self, endian: Self::Endian) -> u32 {
+        self.initprot.get(endian)
+    }
+    fn nsects(&self, endian: Self::Endian) -> u32 {
+        self.nsects.get(endian)
+    }
+    fn flags(&self, endian: Self::Endian) -> u32 {
+        self.flags.get(endian)
+    }
+}
+
+impl<Endian: endian::Endian> Segment for macho::SegmentCommand64<Endian> {
+    type Word = u64;
+    type Endian = Endian;
+    type Section = macho::Section64<Self::Endian>;
+
+    fn from_command(command: LoadCommandData<'_, Self::Endian>) -> Result<Option<(&Self, &[u8])>> {
+        command.segment_64()
+    }
+
+    fn cmd(&self, endian: Self::Endian) -> u32 {
+        self.cmd.get(endian)
+    }
+    fn cmdsize(&self, endian: Self::Endian) -> u32 {
+        self.cmdsize.get(endian)
+    }
+    fn segname(&self) -> &[u8; 16] {
+        &self.segname
+    }
+    fn vmaddr(&self, endian: Self::Endian) -> Self::Word {
+        self.vmaddr.get(endian)
+    }
+    fn vmsize(&self, endian: Self::Endian) -> Self::Word {
+        self.vmsize.get(endian)
+    }
+    fn fileoff(&self, endian: Self::Endian) -> Self::Word {
+        self.fileoff.get(endian)
+    }
+    fn filesize(&self, endian: Self::Endian) -> Self::Word {
+        self.filesize.get(endian)
+    }
+    fn maxprot(&self, endian: Self::Endian) -> u32 {
+        self.maxprot.get(endian)
+    }
+    fn initprot(&self, endian: Self::Endian) -> u32 {
+        self.initprot.get(endian)
+    }
+    fn nsects(&self, endian: Self::Endian) -> u32 {
+        self.nsects.get(endian)
+    }
+    fn flags(&self, endian: Self::Endian) -> u32 {
+        self.flags.get(endian)
+    }
+}

vendor/object/src/read/macho/symbol.rs

@@ -0,0 +1,492 @@
+use alloc::vec::Vec;
+use core::fmt::Debug;
+use core::{fmt, slice, str};
+
+use crate::endian::{self, Endianness};
+use crate::macho;
+use crate::pod::Pod;
+use crate::read::util::StringTable;
+use crate::read::{
+    self, ObjectMap, ObjectMapEntry, ObjectSymbol, ObjectSymbolTable, ReadError, ReadRef, Result,
+    SectionIndex, SectionKind, SymbolFlags, SymbolIndex, SymbolKind, SymbolMap, SymbolMapEntry,
+    SymbolScope, SymbolSection,
+};
+
+use super::{MachHeader, MachOFile};
+
+/// A table of symbol entries in a Mach-O file.
+///
+/// Also includes the string table used for the symbol names.
+///
+/// Returned by [`macho::SymtabCommand::symbols`].
+#[derive(Debug, Clone, Copy)]
+pub struct SymbolTable<'data, Mach: MachHeader, R = &'data [u8]>
+where
+    R: ReadRef<'data>,
+{
+    symbols: &'data [Mach::Nlist],
+    strings: StringTable<'data, R>,
+}
+
+impl<'data, Mach: MachHeader, R: ReadRef<'data>> Default for SymbolTable<'data, Mach, R> {
+    fn default() -> Self {
+        SymbolTable {
+            symbols: &[],
+            strings: Default::default(),
+        }
+    }
+}
+
+impl<'data, Mach: MachHeader, R: ReadRef<'data>> SymbolTable<'data, Mach, R> {
+    #[inline]
+    pub(super) fn new(symbols: &'data [Mach::Nlist], strings: StringTable<'data, R>) -> Self {
+        SymbolTable { symbols, strings }
+    }
+
+    /// Return the string table used for the symbol names.
+    #[inline]
+    pub fn strings(&self) -> StringTable<'data, R> {
+        self.strings
+    }
+
+    /// Iterate over the symbols.
+    #[inline]
+    pub fn iter(&self) -> slice::Iter<'data, Mach::Nlist> {
+        self.symbols.iter()
+    }
+
+    /// Return true if the symbol table is empty.
+    #[inline]
+    pub fn is_empty(&self) -> bool {
+        self.symbols.is_empty()
+    }
+
+    /// The number of symbols.
+    #[inline]
+    pub fn len(&self) -> usize {
+        self.symbols.len()
+    }
+
+    /// Return the symbol at the given index.
+    pub fn symbol(&self, index: usize) -> Result<&'data Mach::Nlist> {
+        self.symbols
+            .get(index)
+            .read_error("Invalid Mach-O symbol index")
+    }
+
+    /// Construct a map from addresses to a user-defined map entry.
+    pub fn map<Entry: SymbolMapEntry, F: Fn(&'data Mach::Nlist) -> Option<Entry>>(
+        &self,
+        f: F,
+    ) -> SymbolMap<Entry> {
+        let mut symbols = Vec::new();
+        for nlist in self.symbols {
+            if !nlist.is_definition() {
+                continue;
+            }
+            if let Some(entry) = f(nlist) {
+                symbols.push(entry);
+            }
+        }
+        SymbolMap::new(symbols)
+    }
+
+    /// Construct a map from addresses to symbol names and object file names.
+    pub fn object_map(&self, endian: Mach::Endian) -> ObjectMap<'data> {
+        let mut symbols = Vec::new();
+        let mut objects = Vec::new();
+        let mut object = None;
+        let mut current_function = None;
+        // Each module starts with one or two N_SO symbols (path, or directory + filename)
+        // and one N_OSO symbol. The module is terminated by an empty N_SO symbol.
+        for nlist in self.symbols {
+            let n_type = nlist.n_type();
+            if n_type & macho::N_STAB == 0 {
+                continue;
+            }
+            // TODO: includes variables too (N_GSYM, N_STSYM). These may need to get their
+            // address from regular symbols though.
+            match n_type {
+                macho::N_SO => {
+                    object = None;
+                }
+                macho::N_OSO => {
+                    object = None;
+                    if let Ok(name) = nlist.name(endian, self.strings) {
+                        if !name.is_empty() {
+                            object = Some(objects.len());
+                            objects.push(name);
+                        }
+                    }
+                }
+                macho::N_FUN => {
+                    if let Ok(name) = nlist.name(endian, self.strings) {
+                        if !name.is_empty() {
+                            current_function = Some((name, nlist.n_value(endian).into()))
+                        } else if let Some((name, address)) = current_function.take() {
+                            if let Some(object) = object {
+                                symbols.push(ObjectMapEntry {
+                                    address,
+                                    size: nlist.n_value(endian).into(),
+                                    name,
+                                    object,
+                                });
+                            }
+                        }
+                    }
+                }
+                _ => {}
+            }
+        }
+        ObjectMap {
+            symbols: SymbolMap::new(symbols),
+            objects,
+        }
+    }
+}
+
+/// A symbol table in a [`MachOFile32`](super::MachOFile32).
+pub type MachOSymbolTable32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOSymbolTable<'data, 'file, macho::MachHeader32<Endian>, R>;
+/// A symbol table in a [`MachOFile64`](super::MachOFile64).
+pub type MachOSymbolTable64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOSymbolTable<'data, 'file, macho::MachHeader64<Endian>, R>;
+
+/// A symbol table in a [`MachOFile`].
+#[derive(Debug, Clone, Copy)]
+pub struct MachOSymbolTable<'data, 'file, Mach, R = &'data [u8]>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) file: &'file MachOFile<'data, Mach, R>,
+}
+
+impl<'data, 'file, Mach, R> read::private::Sealed for MachOSymbolTable<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+}
+
+impl<'data, 'file, Mach, R> ObjectSymbolTable<'data> for MachOSymbolTable<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    type Symbol = MachOSymbol<'data, 'file, Mach, R>;
+    type SymbolIterator = MachOSymbolIterator<'data, 'file, Mach, R>;
+
+    fn symbols(&self) -> Self::SymbolIterator {
+        MachOSymbolIterator {
+            file: self.file,
+            index: 0,
+        }
+    }
+
+    fn symbol_by_index(&self, index: SymbolIndex) -> Result<Self::Symbol> {
+        let nlist = self.file.symbols.symbol(index.0)?;
+        MachOSymbol::new(self.file, index, nlist).read_error("Unsupported Mach-O symbol index")
+    }
+}
+
+/// An iterator for the symbols in a [`MachOFile32`](super::MachOFile32).
+pub type MachOSymbolIterator32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOSymbolIterator<'data, 'file, macho::MachHeader32<Endian>, R>;
+/// An iterator for the symbols in a [`MachOFile64`](super::MachOFile64).
+pub type MachOSymbolIterator64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOSymbolIterator<'data, 'file, macho::MachHeader64<Endian>, R>;
+
+/// An iterator for the symbols in a [`MachOFile`].
+pub struct MachOSymbolIterator<'data, 'file, Mach, R = &'data [u8]>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) file: &'file MachOFile<'data, Mach, R>,
+    pub(super) index: usize,
+}
+
+impl<'data, 'file, Mach, R> fmt::Debug for MachOSymbolIterator<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("MachOSymbolIterator").finish()
+    }
+}
+
+impl<'data, 'file, Mach, R> Iterator for MachOSymbolIterator<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    type Item = MachOSymbol<'data, 'file, Mach, R>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        loop {
+            let index = self.index;
+            let nlist = self.file.symbols.symbols.get(index)?;
+            self.index += 1;
+            if let Some(symbol) = MachOSymbol::new(self.file, SymbolIndex(index), nlist) {
+                return Some(symbol);
+            }
+        }
+    }
+}
+
+/// A symbol in a [`MachOFile32`](super::MachOFile32).
+pub type MachOSymbol32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOSymbol<'data, 'file, macho::MachHeader32<Endian>, R>;
+/// A symbol in a [`MachOFile64`](super::MachOFile64).
+pub type MachOSymbol64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOSymbol<'data, 'file, macho::MachHeader64<Endian>, R>;
+
+/// A symbol in a [`MachOFile`].
+///
+/// Most functionality is provided by the [`ObjectSymbol`] trait implementation.
+#[derive(Debug, Clone, Copy)]
+pub struct MachOSymbol<'data, 'file, Mach, R = &'data [u8]>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    file: &'file MachOFile<'data, Mach, R>,
+    index: SymbolIndex,
+    nlist: &'data Mach::Nlist,
+}
+
+impl<'data, 'file, Mach, R> MachOSymbol<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) fn new(
+        file: &'file MachOFile<'data, Mach, R>,
+        index: SymbolIndex,
+        nlist: &'data Mach::Nlist,
+    ) -> Option<Self> {
+        if nlist.n_type() & macho::N_STAB != 0 {
+            return None;
+        }
+        Some(MachOSymbol { file, index, nlist })
+    }
+}
+
+impl<'data, 'file, Mach, R> read::private::Sealed for MachOSymbol<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+}
+
+impl<'data, 'file, Mach, R> ObjectSymbol<'data> for MachOSymbol<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    #[inline]
+    fn index(&self) -> SymbolIndex {
+        self.index
+    }
+
+    fn name_bytes(&self) -> Result<&'data [u8]> {
+        self.nlist.name(self.file.endian, self.file.symbols.strings)
+    }
+
+    fn name(&self) -> Result<&'data str> {
+        let name = self.name_bytes()?;
+        str::from_utf8(name)
+            .ok()
+            .read_error("Non UTF-8 Mach-O symbol name")
+    }
+
+    #[inline]
+    fn address(&self) -> u64 {
+        self.nlist.n_value(self.file.endian).into()
+    }
+
+    #[inline]
+    fn size(&self) -> u64 {
+        0
+    }
+
+    fn kind(&self) -> SymbolKind {
+        self.section()
+            .index()
+            .and_then(|index| self.file.section_internal(index).ok())
+            .map(|section| match section.kind {
+                SectionKind::Text => SymbolKind::Text,
+                SectionKind::Data
+                | SectionKind::ReadOnlyData
+                | SectionKind::ReadOnlyString
+                | SectionKind::UninitializedData
+                | SectionKind::Common => SymbolKind::Data,
+                SectionKind::Tls | SectionKind::UninitializedTls | SectionKind::TlsVariables => {
+                    SymbolKind::Tls
+                }
+                _ => SymbolKind::Unknown,
+            })
+            .unwrap_or(SymbolKind::Unknown)
+    }
+
+    fn section(&self) -> SymbolSection {
+        match self.nlist.n_type() & macho::N_TYPE {
+            macho::N_UNDF => SymbolSection::Undefined,
+            macho::N_ABS => SymbolSection::Absolute,
+            macho::N_SECT => {
+                let n_sect = self.nlist.n_sect();
+                if n_sect != 0 {
+                    SymbolSection::Section(SectionIndex(n_sect as usize))
+                } else {
+                    SymbolSection::Unknown
+                }
+            }
+            _ => SymbolSection::Unknown,
+        }
+    }
+
+    #[inline]
+    fn is_undefined(&self) -> bool {
+        self.nlist.n_type() & macho::N_TYPE == macho::N_UNDF
+    }
+
+    #[inline]
+    fn is_definition(&self) -> bool {
+        self.nlist.is_definition()
+    }
+
+    #[inline]
+    fn is_common(&self) -> bool {
+        // Mach-O common symbols are based on section, not symbol
+        false
+    }
+
+    #[inline]
+    fn is_weak(&self) -> bool {
+        self.nlist.n_desc(self.file.endian) & (macho::N_WEAK_REF | macho::N_WEAK_DEF) != 0
+    }
+
+    fn scope(&self) -> SymbolScope {
+        let n_type = self.nlist.n_type();
+        if n_type & macho::N_TYPE == macho::N_UNDF {
+            SymbolScope::Unknown
+        } else if n_type & macho::N_EXT == 0 {
+            SymbolScope::Compilation
+        } else if n_type & macho::N_PEXT != 0 {
+            SymbolScope::Linkage
+        } else {
+            SymbolScope::Dynamic
+        }
+    }
+
+    #[inline]
+    fn is_global(&self) -> bool {
+        self.scope() != SymbolScope::Compilation
+    }
+
+    #[inline]
+    fn is_local(&self) -> bool {
+        self.scope() == SymbolScope::Compilation
+    }
+
+    #[inline]
+    fn flags(&self) -> SymbolFlags<SectionIndex, SymbolIndex> {
+        let n_desc = self.nlist.n_desc(self.file.endian);
+        SymbolFlags::MachO { n_desc }
+    }
+}
+
+/// A trait for generic access to [`macho::Nlist32`] and [`macho::Nlist64`].
+#[allow(missing_docs)]
+pub trait Nlist: Debug + Pod {
+    type Word: Into<u64>;
+    type Endian: endian::Endian;
+
+    fn n_strx(&self, endian: Self::Endian) -> u32;
+    fn n_type(&self) -> u8;
+    fn n_sect(&self) -> u8;
+    fn n_desc(&self, endian: Self::Endian) -> u16;
+    fn n_value(&self, endian: Self::Endian) -> Self::Word;
+
+    fn name<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Self::Endian,
+        strings: StringTable<'data, R>,
+    ) -> Result<&'data [u8]> {
+        strings
+            .get(self.n_strx(endian))
+            .read_error("Invalid Mach-O symbol name offset")
+    }
+
+    /// Return true if this is a STAB symbol.
+    ///
+    /// This determines the meaning of the `n_type` field.
+    fn is_stab(&self) -> bool {
+        self.n_type() & macho::N_STAB != 0
+    }
+
+    /// Return true if this is an undefined symbol.
+    fn is_undefined(&self) -> bool {
+        let n_type = self.n_type();
+        n_type & macho::N_STAB == 0 && n_type & macho::N_TYPE == macho::N_UNDF
+    }
+
+    /// Return true if the symbol is a definition of a function or data object.
+    fn is_definition(&self) -> bool {
+        let n_type = self.n_type();
+        n_type & macho::N_STAB == 0 && n_type & macho::N_TYPE == macho::N_SECT
+    }
+
+    /// Return the library ordinal.
+    ///
+    /// This is either a 1-based index into the dylib load commands,
+    /// or a special ordinal.
+    #[inline]
+    fn library_ordinal(&self, endian: Self::Endian) -> u8 {
+        (self.n_desc(endian) >> 8) as u8
+    }
+}
+
+impl<Endian: endian::Endian> Nlist for macho::Nlist32<Endian> {
+    type Word = u32;
+    type Endian = Endian;
+
+    fn n_strx(&self, endian: Self::Endian) -> u32 {
+        self.n_strx.get(endian)
+    }
+    fn n_type(&self) -> u8 {
+        self.n_type
+    }
+    fn n_sect(&self) -> u8 {
+        self.n_sect
+    }
+    fn n_desc(&self, endian: Self::Endian) -> u16 {
+        self.n_desc.get(endian)
+    }
+    fn n_value(&self, endian: Self::Endian) -> Self::Word {
+        self.n_value.get(endian)
+    }
+}
+
+impl<Endian: endian::Endian> Nlist for macho::Nlist64<Endian> {
+    type Word = u64;
+    type Endian = Endian;
+
+    fn n_strx(&self, endian: Self::Endian) -> u32 {
+        self.n_strx.get(endian)
+    }
+    fn n_type(&self) -> u8 {
+        self.n_type
+    }
+    fn n_sect(&self) -> u8 {
+        self.n_sect
+    }
+    fn n_desc(&self, endian: Self::Endian) -> u16 {
+        self.n_desc.get(endian)
+    }
+    fn n_value(&self, endian: Self::Endian) -> Self::Word {
+        self.n_value.get(endian)
+    }
+}

vendor/object/src/read/mod.rs

@@ -0,0 +1,860 @@
+//! Interface for reading object files.
+//!
+//! ## Unified read API
+//!
+//! The [`Object`] trait provides a unified read API for accessing common features of
+//! object files, such as sections and symbols. There is an implementation of this
+//! trait for [`File`], which allows reading any file format, as well as implementations
+//! for each file format:
+//! [`ElfFile`](elf::ElfFile), [`MachOFile`](macho::MachOFile), [`CoffFile`](coff::CoffFile),
+//! [`PeFile`](pe::PeFile), [`WasmFile`](wasm::WasmFile), [`XcoffFile`](xcoff::XcoffFile).
+//!
+//! ## Low level read API
+//!
+//! The submodules for each file format define helpers that operate on the raw structs.
+//! These can be used instead of the unified API, or in conjunction with it to access
+//! details that are not available via the unified API.
+//!
+//! See the [submodules](#modules) for examples of the low level read API.
+//!
+//! ## Naming Convention
+//!
+//! Types that form part of the unified API for a file format are prefixed with the
+//! name of the file format.
+//!
+//! ## Example for unified read API
+//!  ```no_run
+//! use object::{Object, ObjectSection};
+//! use std::error::Error;
+//! use std::fs;
+//!
+//! /// Reads a file and displays the name of each section.
+//! fn main() -> Result<(), Box<dyn Error>> {
+//! #   #[cfg(feature = "std")] {
+//!     let data = fs::read("path/to/binary")?;
+//!     let file = object::File::parse(&*data)?;
+//!     for section in file.sections() {
+//!         println!("{}", section.name()?);
+//!     }
+//! #   }
+//!     Ok(())
+//! }
+//! ```
+
+use alloc::borrow::Cow;
+use alloc::vec::Vec;
+use core::{fmt, result};
+
+use crate::common::*;
+
+mod read_ref;
+pub use read_ref::*;
+
+#[cfg(feature = "std")]
+mod read_cache;
+#[cfg(feature = "std")]
+pub use read_cache::*;
+
+mod util;
+pub use util::*;
+
+#[cfg(any(
+    feature = "coff",
+    feature = "elf",
+    feature = "macho",
+    feature = "pe",
+    feature = "wasm",
+    feature = "xcoff"
+))]
+mod any;
+#[cfg(any(
+    feature = "coff",
+    feature = "elf",
+    feature = "macho",
+    feature = "pe",
+    feature = "wasm",
+    feature = "xcoff"
+))]
+pub use any::*;
+
+#[cfg(feature = "archive")]
+pub mod archive;
+
+#[cfg(feature = "coff")]
+pub mod coff;
+
+#[cfg(feature = "elf")]
+pub mod elf;
+
+#[cfg(feature = "macho")]
+pub mod macho;
+
+#[cfg(feature = "pe")]
+pub mod pe;
+
+#[cfg(feature = "wasm")]
+pub mod wasm;
+
+#[cfg(feature = "xcoff")]
+pub mod xcoff;
+
+mod traits;
+pub use traits::*;
+
+mod private {
+    pub trait Sealed {}
+}
+
+/// The error type used within the read module.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct Error(&'static str);
+
+impl fmt::Display for Error {
+    #[inline]
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.write_str(self.0)
+    }
+}
+
+#[cfg(feature = "std")]
+impl std::error::Error for Error {}
+
+/// The result type used within the read module.
+pub type Result<T> = result::Result<T, Error>;
+
+trait ReadError<T> {
+    fn read_error(self, error: &'static str) -> Result<T>;
+}
+
+impl<T> ReadError<T> for result::Result<T, ()> {
+    fn read_error(self, error: &'static str) -> Result<T> {
+        self.map_err(|()| Error(error))
+    }
+}
+
+impl<T> ReadError<T> for result::Result<T, Error> {
+    fn read_error(self, error: &'static str) -> Result<T> {
+        self.map_err(|_| Error(error))
+    }
+}
+
+impl<T> ReadError<T> for Option<T> {
+    fn read_error(self, error: &'static str) -> Result<T> {
+        self.ok_or(Error(error))
+    }
+}
+
+/// The native executable file for the target platform.
+#[cfg(all(
+    unix,
+    not(target_os = "macos"),
+    target_pointer_width = "32",
+    feature = "elf"
+))]
+pub type NativeFile<'data, R = &'data [u8]> = elf::ElfFile32<'data, crate::Endianness, R>;
+
+/// The native executable file for the target platform.
+#[cfg(all(
+    unix,
+    not(target_os = "macos"),
+    target_pointer_width = "64",
+    feature = "elf"
+))]
+pub type NativeFile<'data, R = &'data [u8]> = elf::ElfFile64<'data, crate::Endianness, R>;
+
+/// The native executable file for the target platform.
+#[cfg(all(target_os = "macos", target_pointer_width = "32", feature = "macho"))]
+pub type NativeFile<'data, R = &'data [u8]> = macho::MachOFile32<'data, crate::Endianness, R>;
+
+/// The native executable file for the target platform.
+#[cfg(all(target_os = "macos", target_pointer_width = "64", feature = "macho"))]
+pub type NativeFile<'data, R = &'data [u8]> = macho::MachOFile64<'data, crate::Endianness, R>;
+
+/// The native executable file for the target platform.
+#[cfg(all(target_os = "windows", target_pointer_width = "32", feature = "pe"))]
+pub type NativeFile<'data, R = &'data [u8]> = pe::PeFile32<'data, R>;
+
+/// The native executable file for the target platform.
+#[cfg(all(target_os = "windows", target_pointer_width = "64", feature = "pe"))]
+pub type NativeFile<'data, R = &'data [u8]> = pe::PeFile64<'data, R>;
+
+/// The native executable file for the target platform.
+#[cfg(all(feature = "wasm", target_arch = "wasm32", feature = "wasm"))]
+pub type NativeFile<'data, R = &'data [u8]> = wasm::WasmFile<'data, R>;
+
+/// A file format kind.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[non_exhaustive]
+pub enum FileKind {
+    /// A Unix archive.
+    ///
+    /// See [`archive::ArchiveFile`].
+    #[cfg(feature = "archive")]
+    Archive,
+    /// A COFF object file.
+    ///
+    /// See [`coff::CoffFile`].
+    #[cfg(feature = "coff")]
+    Coff,
+    /// A COFF bigobj object file.
+    ///
+    /// This supports a larger number of sections.
+    ///
+    /// See [`coff::CoffBigFile`].
+    #[cfg(feature = "coff")]
+    CoffBig,
+    /// A Windows short import file.
+    ///
+    /// See [`coff::ImportFile`].
+    #[cfg(feature = "coff")]
+    CoffImport,
+    /// A dyld cache file containing Mach-O images.
+    ///
+    /// See [`macho::DyldCache`]
+    #[cfg(feature = "macho")]
+    DyldCache,
+    /// A 32-bit ELF file.
+    ///
+    /// See [`elf::ElfFile32`].
+    #[cfg(feature = "elf")]
+    Elf32,
+    /// A 64-bit ELF file.
+    ///
+    /// See [`elf::ElfFile64`].
+    #[cfg(feature = "elf")]
+    Elf64,
+    /// A 32-bit Mach-O file.
+    ///
+    /// See [`macho::MachOFile32`].
+    #[cfg(feature = "macho")]
+    MachO32,
+    /// A 64-bit Mach-O file.
+    ///
+    /// See [`macho::MachOFile64`].
+    #[cfg(feature = "macho")]
+    MachO64,
+    /// A 32-bit Mach-O fat binary.
+    ///
+    /// See [`macho::FatHeader::parse_arch32`].
+    #[cfg(feature = "macho")]
+    MachOFat32,
+    /// A 64-bit Mach-O fat binary.
+    ///
+    /// See [`macho::FatHeader::parse_arch64`].
+    #[cfg(feature = "macho")]
+    MachOFat64,
+    /// A 32-bit PE file.
+    ///
+    /// See [`pe::PeFile32`].
+    #[cfg(feature = "pe")]
+    Pe32,
+    /// A 64-bit PE file.
+    ///
+    /// See [`pe::PeFile64`].
+    #[cfg(feature = "pe")]
+    Pe64,
+    /// A Wasm file.
+    ///
+    /// See [`wasm::WasmFile`].
+    #[cfg(feature = "wasm")]
+    Wasm,
+    /// A 32-bit XCOFF file.
+    ///
+    /// See [`xcoff::XcoffFile32`].
+    #[cfg(feature = "xcoff")]
+    Xcoff32,
+    /// A 64-bit XCOFF file.
+    ///
+    /// See [`xcoff::XcoffFile64`].
+    #[cfg(feature = "xcoff")]
+    Xcoff64,
+}
+
+impl FileKind {
+    /// Determine a file kind by parsing the start of the file.
+    pub fn parse<'data, R: ReadRef<'data>>(data: R) -> Result<FileKind> {
+        Self::parse_at(data, 0)
+    }
+
+    /// Determine a file kind by parsing at the given offset.
+    pub fn parse_at<'data, R: ReadRef<'data>>(data: R, offset: u64) -> Result<FileKind> {
+        let magic = data
+            .read_bytes_at(offset, 16)
+            .read_error("Could not read file magic")?;
+        if magic.len() < 16 {
+            return Err(Error("File too short"));
+        }
+
+        let kind = match [magic[0], magic[1], magic[2], magic[3], magic[4], magic[5], magic[6], magic[7]] {
+            #[cfg(feature = "archive")]
+            [b'!', b'<', b'a', b'r', b'c', b'h', b'>', b'\n'] => FileKind::Archive,
+            #[cfg(feature = "macho")]
+            [b'd', b'y', b'l', b'd', b'_', b'v', b'1', b' '] => FileKind::DyldCache,
+            #[cfg(feature = "elf")]
+            [0x7f, b'E', b'L', b'F', 1, ..] => FileKind::Elf32,
+            #[cfg(feature = "elf")]
+            [0x7f, b'E', b'L', b'F', 2, ..] => FileKind::Elf64,
+            #[cfg(feature = "macho")]
+            [0xfe, 0xed, 0xfa, 0xce, ..]
+            | [0xce, 0xfa, 0xed, 0xfe, ..] => FileKind::MachO32,
+            #[cfg(feature = "macho")]
+            | [0xfe, 0xed, 0xfa, 0xcf, ..]
+            | [0xcf, 0xfa, 0xed, 0xfe, ..] => FileKind::MachO64,
+            #[cfg(feature = "macho")]
+            [0xca, 0xfe, 0xba, 0xbe, ..] => FileKind::MachOFat32,
+            #[cfg(feature = "macho")]
+            [0xca, 0xfe, 0xba, 0xbf, ..] => FileKind::MachOFat64,
+            #[cfg(feature = "wasm")]
+            [0x00, b'a', b's', b'm', ..] => FileKind::Wasm,
+            #[cfg(feature = "pe")]
+            [b'M', b'Z', ..] if offset == 0 => {
+                // offset == 0 restriction is because optional_header_magic only looks at offset 0
+                match pe::optional_header_magic(data) {
+                    Ok(crate::pe::IMAGE_NT_OPTIONAL_HDR32_MAGIC) => {
+                        FileKind::Pe32
+                    }
+                    Ok(crate::pe::IMAGE_NT_OPTIONAL_HDR64_MAGIC) => {
+                        FileKind::Pe64
+                    }
+                    _ => return Err(Error("Unknown MS-DOS file")),
+                }
+            }
+            // TODO: more COFF machines
+            #[cfg(feature = "coff")]
+            // COFF arm
+            [0xc4, 0x01, ..]
+            // COFF arm64
+            | [0x64, 0xaa, ..]
+            // COFF arm64ec
+            | [0x41, 0xa6, ..]
+            // COFF x86
+            | [0x4c, 0x01, ..]
+            // COFF x86-64
+            | [0x64, 0x86, ..] => FileKind::Coff,
+            #[cfg(feature = "coff")]
+            [0x00, 0x00, 0xff, 0xff, 0x00, 0x00, ..] => FileKind::CoffImport,
+            #[cfg(feature = "coff")]
+            [0x00, 0x00, 0xff, 0xff, 0x02, 0x00, ..] if offset == 0 => {
+                // offset == 0 restriction is because anon_object_class_id only looks at offset 0
+                match coff::anon_object_class_id(data) {
+                    Ok(crate::pe::ANON_OBJECT_HEADER_BIGOBJ_CLASS_ID) => FileKind::CoffBig,
+                    _ => return Err(Error("Unknown anon object file")),
+                }
+            }
+            #[cfg(feature = "xcoff")]
+            [0x01, 0xdf, ..] => FileKind::Xcoff32,
+            #[cfg(feature = "xcoff")]
+            [0x01, 0xf7, ..] => FileKind::Xcoff64,
+            _ => return Err(Error("Unknown file magic")),
+        };
+        Ok(kind)
+    }
+}
+
+/// An object kind.
+///
+/// Returned by [`Object::kind`].
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[non_exhaustive]
+pub enum ObjectKind {
+    /// The object kind is unknown.
+    Unknown,
+    /// Relocatable object.
+    Relocatable,
+    /// Executable.
+    Executable,
+    /// Dynamic shared object.
+    Dynamic,
+    /// Core.
+    Core,
+}
+
+/// The index used to identify a section in a file.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct SectionIndex(pub usize);
+
+/// The index used to identify a symbol in a symbol table.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct SymbolIndex(pub usize);
+
+/// The section where an [`ObjectSymbol`] is defined.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[non_exhaustive]
+pub enum SymbolSection {
+    /// The section is unknown.
+    Unknown,
+    /// The section is not applicable for this symbol (such as file symbols).
+    None,
+    /// The symbol is undefined.
+    Undefined,
+    /// The symbol has an absolute value.
+    Absolute,
+    /// The symbol is a zero-initialized symbol that will be combined with duplicate definitions.
+    Common,
+    /// The symbol is defined in the given section.
+    Section(SectionIndex),
+}
+
+impl SymbolSection {
+    /// Returns the section index for the section where the symbol is defined.
+    ///
+    /// May return `None` if the symbol is not defined in a section.
+    #[inline]
+    pub fn index(self) -> Option<SectionIndex> {
+        if let SymbolSection::Section(index) = self {
+            Some(index)
+        } else {
+            None
+        }
+    }
+}
+
+/// An entry in a [`SymbolMap`].
+pub trait SymbolMapEntry {
+    /// The symbol address.
+    fn address(&self) -> u64;
+}
+
+/// A map from addresses to symbol information.
+///
+/// The symbol information depends on the chosen entry type, such as [`SymbolMapName`].
+///
+/// Returned by [`Object::symbol_map`].
+#[derive(Debug, Default, Clone)]
+pub struct SymbolMap<T: SymbolMapEntry> {
+    symbols: Vec<T>,
+}
+
+impl<T: SymbolMapEntry> SymbolMap<T> {
+    /// Construct a new symbol map.
+    ///
+    /// This function will sort the symbols by address.
+    pub fn new(mut symbols: Vec<T>) -> Self {
+        symbols.sort_by_key(|s| s.address());
+        SymbolMap { symbols }
+    }
+
+    /// Get the symbol before the given address.
+    pub fn get(&self, address: u64) -> Option<&T> {
+        let index = match self
+            .symbols
+            .binary_search_by_key(&address, |symbol| symbol.address())
+        {
+            Ok(index) => index,
+            Err(index) => index.checked_sub(1)?,
+        };
+        self.symbols.get(index)
+    }
+
+    /// Get all symbols in the map.
+    #[inline]
+    pub fn symbols(&self) -> &[T] {
+        &self.symbols
+    }
+}
+
+/// The type used for entries in a [`SymbolMap`] that maps from addresses to names.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct SymbolMapName<'data> {
+    address: u64,
+    name: &'data str,
+}
+
+impl<'data> SymbolMapName<'data> {
+    /// Construct a `SymbolMapName`.
+    pub fn new(address: u64, name: &'data str) -> Self {
+        SymbolMapName { address, name }
+    }
+
+    /// The symbol address.
+    #[inline]
+    pub fn address(&self) -> u64 {
+        self.address
+    }
+
+    /// The symbol name.
+    #[inline]
+    pub fn name(&self) -> &'data str {
+        self.name
+    }
+}
+
+impl<'data> SymbolMapEntry for SymbolMapName<'data> {
+    #[inline]
+    fn address(&self) -> u64 {
+        self.address
+    }
+}
+
+/// A map from addresses to symbol names and object files.
+///
+/// This is derived from STAB entries in Mach-O files.
+///
+/// Returned by [`Object::object_map`].
+#[derive(Debug, Default, Clone)]
+pub struct ObjectMap<'data> {
+    symbols: SymbolMap<ObjectMapEntry<'data>>,
+    objects: Vec<&'data [u8]>,
+}
+
+impl<'data> ObjectMap<'data> {
+    /// Get the entry containing the given address.
+    pub fn get(&self, address: u64) -> Option<&ObjectMapEntry<'data>> {
+        self.symbols
+            .get(address)
+            .filter(|entry| entry.size == 0 || address.wrapping_sub(entry.address) < entry.size)
+    }
+
+    /// Get all symbols in the map.
+    #[inline]
+    pub fn symbols(&self) -> &[ObjectMapEntry<'data>] {
+        self.symbols.symbols()
+    }
+
+    /// Get all objects in the map.
+    #[inline]
+    pub fn objects(&self) -> &[&'data [u8]] {
+        &self.objects
+    }
+}
+
+/// An [`ObjectMap`] entry.
+#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct ObjectMapEntry<'data> {
+    address: u64,
+    size: u64,
+    name: &'data [u8],
+    object: usize,
+}
+
+impl<'data> ObjectMapEntry<'data> {
+    /// Get the symbol address.
+    #[inline]
+    pub fn address(&self) -> u64 {
+        self.address
+    }
+
+    /// Get the symbol size.
+    ///
+    /// This may be 0 if the size is unknown.
+    #[inline]
+    pub fn size(&self) -> u64 {
+        self.size
+    }
+
+    /// Get the symbol name.
+    #[inline]
+    pub fn name(&self) -> &'data [u8] {
+        self.name
+    }
+
+    /// Get the index of the object file name.
+    #[inline]
+    pub fn object_index(&self) -> usize {
+        self.object
+    }
+
+    /// Get the object file name.
+    #[inline]
+    pub fn object(&self, map: &ObjectMap<'data>) -> &'data [u8] {
+        map.objects[self.object]
+    }
+}
+
+impl<'data> SymbolMapEntry for ObjectMapEntry<'data> {
+    #[inline]
+    fn address(&self) -> u64 {
+        self.address
+    }
+}
+
+/// An imported symbol.
+///
+/// Returned by [`Object::imports`].
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct Import<'data> {
+    library: ByteString<'data>,
+    // TODO: or ordinal
+    name: ByteString<'data>,
+}
+
+impl<'data> Import<'data> {
+    /// The symbol name.
+    #[inline]
+    pub fn name(&self) -> &'data [u8] {
+        self.name.0
+    }
+
+    /// The name of the library to import the symbol from.
+    #[inline]
+    pub fn library(&self) -> &'data [u8] {
+        self.library.0
+    }
+}
+
+/// An exported symbol.
+///
+/// Returned by [`Object::exports`].
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct Export<'data> {
+    // TODO: and ordinal?
+    name: ByteString<'data>,
+    address: u64,
+}
+
+impl<'data> Export<'data> {
+    /// The symbol name.
+    #[inline]
+    pub fn name(&self) -> &'data [u8] {
+        self.name.0
+    }
+
+    /// The virtual address of the symbol.
+    #[inline]
+    pub fn address(&self) -> u64 {
+        self.address
+    }
+}
+
+/// PDB information from the debug directory in a PE file.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct CodeView<'data> {
+    guid: [u8; 16],
+    path: ByteString<'data>,
+    age: u32,
+}
+
+impl<'data> CodeView<'data> {
+    /// The path to the PDB as stored in CodeView.
+    #[inline]
+    pub fn path(&self) -> &'data [u8] {
+        self.path.0
+    }
+
+    /// The age of the PDB.
+    #[inline]
+    pub fn age(&self) -> u32 {
+        self.age
+    }
+
+    /// The GUID of the PDB.
+    #[inline]
+    pub fn guid(&self) -> [u8; 16] {
+        self.guid
+    }
+}
+
+/// The target referenced by a [`Relocation`].
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[non_exhaustive]
+pub enum RelocationTarget {
+    /// The target is a symbol.
+    Symbol(SymbolIndex),
+    /// The target is a section.
+    Section(SectionIndex),
+    /// The offset is an absolute address.
+    Absolute,
+}
+
+/// A relocation entry.
+///
+/// Returned by [`Object::dynamic_relocations`] or [`ObjectSection::relocations`].
+#[derive(Debug)]
+pub struct Relocation {
+    kind: RelocationKind,
+    encoding: RelocationEncoding,
+    size: u8,
+    target: RelocationTarget,
+    addend: i64,
+    implicit_addend: bool,
+}
+
+impl Relocation {
+    /// The operation used to calculate the result of the relocation.
+    #[inline]
+    pub fn kind(&self) -> RelocationKind {
+        self.kind
+    }
+
+    /// Information about how the result of the relocation operation is encoded in the place.
+    #[inline]
+    pub fn encoding(&self) -> RelocationEncoding {
+        self.encoding
+    }
+
+    /// The size in bits of the place of the relocation.
+    ///
+    /// If 0, then the size is determined by the relocation kind.
+    #[inline]
+    pub fn size(&self) -> u8 {
+        self.size
+    }
+
+    /// The target of the relocation.
+    #[inline]
+    pub fn target(&self) -> RelocationTarget {
+        self.target
+    }
+
+    /// The addend to use in the relocation calculation.
+    #[inline]
+    pub fn addend(&self) -> i64 {
+        self.addend
+    }
+
+    /// Set the addend to use in the relocation calculation.
+    #[inline]
+    pub fn set_addend(&mut self, addend: i64) {
+        self.addend = addend
+    }
+
+    /// Returns true if there is an implicit addend stored in the data at the offset
+    /// to be relocated.
+    #[inline]
+    pub fn has_implicit_addend(&self) -> bool {
+        self.implicit_addend
+    }
+}
+
+/// A data compression format.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[non_exhaustive]
+pub enum CompressionFormat {
+    /// The data is uncompressed.
+    None,
+    /// The data is compressed, but the compression format is unknown.
+    Unknown,
+    /// ZLIB/DEFLATE.
+    ///
+    /// Used for ELF compression and GNU compressed debug information.
+    Zlib,
+    /// Zstandard.
+    ///
+    /// Used for ELF compression.
+    Zstandard,
+}
+
+/// A range in a file that may be compressed.
+///
+/// Returned by [`ObjectSection::compressed_file_range`].
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct CompressedFileRange {
+    /// The data compression format.
+    pub format: CompressionFormat,
+    /// The file offset of the compressed data.
+    pub offset: u64,
+    /// The compressed data size.
+    pub compressed_size: u64,
+    /// The uncompressed data size.
+    pub uncompressed_size: u64,
+}
+
+impl CompressedFileRange {
+    /// Data that is uncompressed.
+    #[inline]
+    pub fn none(range: Option<(u64, u64)>) -> Self {
+        if let Some((offset, size)) = range {
+            CompressedFileRange {
+                format: CompressionFormat::None,
+                offset,
+                compressed_size: size,
+                uncompressed_size: size,
+            }
+        } else {
+            CompressedFileRange {
+                format: CompressionFormat::None,
+                offset: 0,
+                compressed_size: 0,
+                uncompressed_size: 0,
+            }
+        }
+    }
+
+    /// Convert to [`CompressedData`] by reading from the file.
+    pub fn data<'data, R: ReadRef<'data>>(self, file: R) -> Result<CompressedData<'data>> {
+        let data = file
+            .read_bytes_at(self.offset, self.compressed_size)
+            .read_error("Invalid compressed data size or offset")?;
+        Ok(CompressedData {
+            format: self.format,
+            data,
+            uncompressed_size: self.uncompressed_size,
+        })
+    }
+}
+
+/// Data that may be compressed.
+///
+/// Returned by [`ObjectSection::compressed_data`].
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct CompressedData<'data> {
+    /// The data compression format.
+    pub format: CompressionFormat,
+    /// The compressed data.
+    pub data: &'data [u8],
+    /// The uncompressed data size.
+    pub uncompressed_size: u64,
+}
+
+impl<'data> CompressedData<'data> {
+    /// Data that is uncompressed.
+    #[inline]
+    pub fn none(data: &'data [u8]) -> Self {
+        CompressedData {
+            format: CompressionFormat::None,
+            data,
+            uncompressed_size: data.len() as u64,
+        }
+    }
+
+    /// Return the uncompressed data.
+    ///
+    /// Returns an error for invalid data or unsupported compression.
+    /// This includes if the data is compressed but the `compression` feature
+    /// for this crate is disabled.
+    pub fn decompress(self) -> Result<Cow<'data, [u8]>> {
+        match self.format {
+            CompressionFormat::None => Ok(Cow::Borrowed(self.data)),
+            #[cfg(feature = "compression")]
+            CompressionFormat::Zlib => {
+                use core::convert::TryInto;
+                let size = self
+                    .uncompressed_size
+                    .try_into()
+                    .ok()
+                    .read_error("Uncompressed data size is too large.")?;
+                let mut decompressed = Vec::with_capacity(size);
+                let mut decompress = flate2::Decompress::new(true);
+                decompress
+                    .decompress_vec(
+                        self.data,
+                        &mut decompressed,
+                        flate2::FlushDecompress::Finish,
+                    )
+                    .ok()
+                    .read_error("Invalid zlib compressed data")?;
+                Ok(Cow::Owned(decompressed))
+            }
+            #[cfg(feature = "compression")]
+            CompressionFormat::Zstandard => {
+                use core::convert::TryInto;
+                use std::io::Read;
+                let size = self
+                    .uncompressed_size
+                    .try_into()
+                    .ok()
+                    .read_error("Uncompressed data size is too large.")?;
+                let mut decompressed = Vec::with_capacity(size);
+                let mut decoder = ruzstd::StreamingDecoder::new(self.data)
+                    .ok()
+                    .read_error("Invalid zstd compressed data")?;
+                decoder
+                    .read_to_end(&mut decompressed)
+                    .ok()
+                    .read_error("Invalid zstd compressed data")?;
+                Ok(Cow::Owned(decompressed))
+            }
+            _ => Err(Error("Unsupported compressed data.")),
+        }
+    }
+}

vendor/object/src/read/pe/data_directory.rs

@@ -0,0 +1,213 @@
+use core::slice;
+
+use crate::read::{Error, ReadError, ReadRef, Result};
+use crate::{pe, LittleEndian as LE};
+
+use super::{
+    DelayLoadImportTable, ExportTable, ImportTable, RelocationBlockIterator, ResourceDirectory,
+    SectionTable,
+};
+
+/// The table of data directories in a PE file.
+///
+/// Returned by [`ImageNtHeaders::parse`](super::ImageNtHeaders::parse).
+#[derive(Debug, Clone, Copy)]
+pub struct DataDirectories<'data> {
+    entries: &'data [pe::ImageDataDirectory],
+}
+
+impl<'data> DataDirectories<'data> {
+    /// Parse the data directory table.
+    ///
+    /// `data` must be the remaining optional data following the
+    /// [optional header](pe::ImageOptionalHeader64).  `number` must be from the
+    /// [`number_of_rva_and_sizes`](pe::ImageOptionalHeader64::number_of_rva_and_sizes)
+    /// field of the optional header.
+    pub fn parse(data: &'data [u8], number: u32) -> Result<Self> {
+        let entries = data
+            .read_slice_at(0, number as usize)
+            .read_error("Invalid PE number of RVA and sizes")?;
+        Ok(DataDirectories { entries })
+    }
+
+    /// The number of data directories.
+    #[allow(clippy::len_without_is_empty)]
+    pub fn len(&self) -> usize {
+        self.entries.len()
+    }
+
+    /// Iterator over the data directories.
+    pub fn iter(&self) -> slice::Iter<'data, pe::ImageDataDirectory> {
+        self.entries.iter()
+    }
+
+    /// Iterator which gives the directories as well as their index (one of the IMAGE_DIRECTORY_ENTRY_* constants).
+    pub fn enumerate(&self) -> core::iter::Enumerate<slice::Iter<'data, pe::ImageDataDirectory>> {
+        self.entries.iter().enumerate()
+    }
+
+    /// Returns the data directory at the given index.
+    ///
+    /// Index should be one of the `IMAGE_DIRECTORY_ENTRY_*` constants.
+    ///
+    /// Returns `None` if the index is larger than the table size,
+    /// or if the entry at the index has a zero virtual address.
+    pub fn get(&self, index: usize) -> Option<&'data pe::ImageDataDirectory> {
+        self.entries
+            .get(index)
+            .filter(|d| d.virtual_address.get(LE) != 0)
+    }
+
+    /// Returns the unparsed export directory.
+    ///
+    /// `data` must be the entire file data.
+    pub fn export_directory<R: ReadRef<'data>>(
+        &self,
+        data: R,
+        sections: &SectionTable<'data>,
+    ) -> Result<Option<&'data pe::ImageExportDirectory>> {
+        let data_dir = match self.get(pe::IMAGE_DIRECTORY_ENTRY_EXPORT) {
+            Some(data_dir) => data_dir,
+            None => return Ok(None),
+        };
+        let export_data = data_dir.data(data, sections)?;
+        ExportTable::parse_directory(export_data).map(Some)
+    }
+
+    /// Returns the partially parsed export directory.
+    ///
+    /// `data` must be the entire file data.
+    pub fn export_table<R: ReadRef<'data>>(
+        &self,
+        data: R,
+        sections: &SectionTable<'data>,
+    ) -> Result<Option<ExportTable<'data>>> {
+        let data_dir = match self.get(pe::IMAGE_DIRECTORY_ENTRY_EXPORT) {
+            Some(data_dir) => data_dir,
+            None => return Ok(None),
+        };
+        let export_va = data_dir.virtual_address.get(LE);
+        let export_data = data_dir.data(data, sections)?;
+        ExportTable::parse(export_data, export_va).map(Some)
+    }
+
+    /// Returns the partially parsed import directory.
+    ///
+    /// `data` must be the entire file data.
+    pub fn import_table<R: ReadRef<'data>>(
+        &self,
+        data: R,
+        sections: &SectionTable<'data>,
+    ) -> Result<Option<ImportTable<'data>>> {
+        let data_dir = match self.get(pe::IMAGE_DIRECTORY_ENTRY_IMPORT) {
+            Some(data_dir) => data_dir,
+            None => return Ok(None),
+        };
+        let import_va = data_dir.virtual_address.get(LE);
+        let (section_data, section_va) = sections
+            .pe_data_containing(data, import_va)
+            .read_error("Invalid import data dir virtual address")?;
+        Ok(Some(ImportTable::new(section_data, section_va, import_va)))
+    }
+
+    /// Returns the partially parsed delay-load import directory.
+    ///
+    /// `data` must be the entire file data.
+    pub fn delay_load_import_table<R: ReadRef<'data>>(
+        &self,
+        data: R,
+        sections: &SectionTable<'data>,
+    ) -> Result<Option<DelayLoadImportTable<'data>>> {
+        let data_dir = match self.get(pe::IMAGE_DIRECTORY_ENTRY_DELAY_IMPORT) {
+            Some(data_dir) => data_dir,
+            None => return Ok(None),
+        };
+        let import_va = data_dir.virtual_address.get(LE);
+        let (section_data, section_va) = sections
+            .pe_data_containing(data, import_va)
+            .read_error("Invalid import data dir virtual address")?;
+        Ok(Some(DelayLoadImportTable::new(
+            section_data,
+            section_va,
+            import_va,
+        )))
+    }
+
+    /// Returns the blocks in the base relocation directory.
+    ///
+    /// `data` must be the entire file data.
+    pub fn relocation_blocks<R: ReadRef<'data>>(
+        &self,
+        data: R,
+        sections: &SectionTable<'data>,
+    ) -> Result<Option<RelocationBlockIterator<'data>>> {
+        let data_dir = match self.get(pe::IMAGE_DIRECTORY_ENTRY_BASERELOC) {
+            Some(data_dir) => data_dir,
+            None => return Ok(None),
+        };
+        let reloc_data = data_dir.data(data, sections)?;
+        Ok(Some(RelocationBlockIterator::new(reloc_data)))
+    }
+
+    /// Returns the resource directory.
+    ///
+    /// `data` must be the entire file data.
+    pub fn resource_directory<R: ReadRef<'data>>(
+        &self,
+        data: R,
+        sections: &SectionTable<'data>,
+    ) -> Result<Option<ResourceDirectory<'data>>> {
+        let data_dir = match self.get(pe::IMAGE_DIRECTORY_ENTRY_RESOURCE) {
+            Some(data_dir) => data_dir,
+            None => return Ok(None),
+        };
+        let rsrc_data = data_dir.data(data, sections)?;
+        Ok(Some(ResourceDirectory::new(rsrc_data)))
+    }
+}
+
+impl pe::ImageDataDirectory {
+    /// Return the virtual address range of this directory entry.
+    pub fn address_range(&self) -> (u32, u32) {
+        (self.virtual_address.get(LE), self.size.get(LE))
+    }
+
+    /// Return the file offset and size of this directory entry.
+    ///
+    /// This function has some limitations:
+    /// - It requires that the data is contained in a single section.
+    /// - It uses the size field of the directory entry, which is
+    /// not desirable for all data directories.
+    /// - It uses the `virtual_address` of the directory entry as an address,
+    /// which is not valid for `IMAGE_DIRECTORY_ENTRY_SECURITY`.
+    pub fn file_range(&self, sections: &SectionTable<'_>) -> Result<(u32, u32)> {
+        let (offset, section_size) = sections
+            .pe_file_range_at(self.virtual_address.get(LE))
+            .read_error("Invalid data dir virtual address")?;
+        let size = self.size.get(LE);
+        if size > section_size {
+            return Err(Error("Invalid data dir size"));
+        }
+        Ok((offset, size))
+    }
+
+    /// Get the data referenced by this directory entry.
+    ///
+    /// This function has some limitations:
+    /// - It requires that the data is contained in a single section.
+    /// - It uses the size field of the directory entry, which is
+    /// not desirable for all data directories.
+    /// - It uses the `virtual_address` of the directory entry as an address,
+    /// which is not valid for `IMAGE_DIRECTORY_ENTRY_SECURITY`.
+    pub fn data<'data, R: ReadRef<'data>>(
+        &self,
+        data: R,
+        sections: &SectionTable<'data>,
+    ) -> Result<&'data [u8]> {
+        sections
+            .pe_data_at(data, self.virtual_address.get(LE))
+            .read_error("Invalid data dir virtual address")?
+            .get(..self.size.get(LE) as usize)
+            .read_error("Invalid data dir size")
+    }
+}

vendor/object/src/read/pe/export.rs

@@ -0,0 +1,333 @@
+use alloc::vec::Vec;
+use core::fmt::Debug;
+
+use crate::read::{ByteString, Bytes, Error, ReadError, ReadRef, Result};
+use crate::{pe, LittleEndian as LE, U16Bytes, U32Bytes};
+
+/// Where an export is pointing to.
+#[derive(Clone, Copy)]
+pub enum ExportTarget<'data> {
+    /// The address of the export, relative to the image base.
+    Address(u32),
+    /// Forwarded to an export ordinal in another DLL.
+    ///
+    /// This gives the name of the DLL, and the ordinal.
+    ForwardByOrdinal(&'data [u8], u32),
+    /// Forwarded to an export name in another DLL.
+    ///
+    /// This gives the name of the DLL, and the export name.
+    ForwardByName(&'data [u8], &'data [u8]),
+}
+
+impl<'data> ExportTarget<'data> {
+    /// Returns true if the target is an address.
+    pub fn is_address(&self) -> bool {
+        match self {
+            ExportTarget::Address(_) => true,
+            _ => false,
+        }
+    }
+
+    /// Returns true if the export is forwarded to another DLL.
+    pub fn is_forward(&self) -> bool {
+        !self.is_address()
+    }
+}
+
+/// An export from a PE file.
+///
+/// There are multiple kinds of PE exports (with or without a name, and local or forwarded).
+#[derive(Clone, Copy)]
+pub struct Export<'data> {
+    /// The ordinal of the export.
+    ///
+    /// These are sequential, starting at a base specified in the DLL.
+    pub ordinal: u32,
+    /// The name of the export, if known.
+    pub name: Option<&'data [u8]>,
+    /// The target of this export.
+    pub target: ExportTarget<'data>,
+}
+
+impl<'a> Debug for Export<'a> {
+    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::result::Result<(), core::fmt::Error> {
+        f.debug_struct("Export")
+            .field("ordinal", &self.ordinal)
+            .field("name", &self.name.map(ByteString))
+            .field("target", &self.target)
+            .finish()
+    }
+}
+
+impl<'a> Debug for ExportTarget<'a> {
+    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::result::Result<(), core::fmt::Error> {
+        match self {
+            ExportTarget::Address(address) => write!(f, "Address({:#x})", address),
+            ExportTarget::ForwardByOrdinal(library, ordinal) => write!(
+                f,
+                "ForwardByOrdinal({:?}.#{})",
+                ByteString(library),
+                ordinal
+            ),
+            ExportTarget::ForwardByName(library, name) => write!(
+                f,
+                "ForwardByName({:?}.{:?})",
+                ByteString(library),
+                ByteString(name)
+            ),
+        }
+    }
+}
+
+/// A partially parsed PE export table.
+///
+/// Returned by [`DataDirectories::export_table`](super::DataDirectories::export_table).
+#[derive(Debug, Clone)]
+pub struct ExportTable<'data> {
+    data: Bytes<'data>,
+    virtual_address: u32,
+    directory: &'data pe::ImageExportDirectory,
+    addresses: &'data [U32Bytes<LE>],
+    names: &'data [U32Bytes<LE>],
+    name_ordinals: &'data [U16Bytes<LE>],
+}
+
+impl<'data> ExportTable<'data> {
+    /// Parse the export table given its section data and address.
+    pub fn parse(data: &'data [u8], virtual_address: u32) -> Result<Self> {
+        let directory = Self::parse_directory(data)?;
+        let data = Bytes(data);
+
+        let mut addresses = &[][..];
+        let address_of_functions = directory.address_of_functions.get(LE);
+        if address_of_functions != 0 {
+            addresses = data
+                .read_slice_at::<U32Bytes<_>>(
+                    address_of_functions.wrapping_sub(virtual_address) as usize,
+                    directory.number_of_functions.get(LE) as usize,
+                )
+                .read_error("Invalid PE export address table")?;
+        }
+
+        let mut names = &[][..];
+        let mut name_ordinals = &[][..];
+        let address_of_names = directory.address_of_names.get(LE);
+        let address_of_name_ordinals = directory.address_of_name_ordinals.get(LE);
+        if address_of_names != 0 {
+            if address_of_name_ordinals == 0 {
+                return Err(Error("Missing PE export ordinal table"));
+            }
+
+            let number = directory.number_of_names.get(LE) as usize;
+            names = data
+                .read_slice_at::<U32Bytes<_>>(
+                    address_of_names.wrapping_sub(virtual_address) as usize,
+                    number,
+                )
+                .read_error("Invalid PE export name pointer table")?;
+            name_ordinals = data
+                .read_slice_at::<U16Bytes<_>>(
+                    address_of_name_ordinals.wrapping_sub(virtual_address) as usize,
+                    number,
+                )
+                .read_error("Invalid PE export ordinal table")?;
+        }
+
+        Ok(ExportTable {
+            data,
+            virtual_address,
+            directory,
+            addresses,
+            names,
+            name_ordinals,
+        })
+    }
+
+    /// Parse the export directory given its section data.
+    pub fn parse_directory(data: &'data [u8]) -> Result<&'data pe::ImageExportDirectory> {
+        data.read_at::<pe::ImageExportDirectory>(0)
+            .read_error("Invalid PE export dir size")
+    }
+
+    /// Returns the header of the export table.
+    pub fn directory(&self) -> &'data pe::ImageExportDirectory {
+        self.directory
+    }
+
+    /// Returns the base value of ordinals.
+    ///
+    /// Adding this to an address index will give an ordinal.
+    pub fn ordinal_base(&self) -> u32 {
+        self.directory.base.get(LE)
+    }
+
+    /// Returns the unparsed address table.
+    ///
+    /// An address table entry may be a local address, or the address of a forwarded export entry.
+    /// See [`Self::is_forward`] and [`Self::target_from_address`].
+    pub fn addresses(&self) -> &'data [U32Bytes<LE>] {
+        self.addresses
+    }
+
+    /// Returns the unparsed name pointer table.
+    ///
+    /// A name pointer table entry can be used with [`Self::name_from_pointer`].
+    pub fn name_pointers(&self) -> &'data [U32Bytes<LE>] {
+        self.names
+    }
+
+    /// Returns the unparsed ordinal table.
+    ///
+    /// An ordinal table entry is a 0-based index into the address table.
+    /// See [`Self::address_by_index`] and [`Self::target_by_index`].
+    pub fn name_ordinals(&self) -> &'data [U16Bytes<LE>] {
+        self.name_ordinals
+    }
+
+    /// Returns an iterator for the entries in the name pointer table and ordinal table.
+    ///
+    /// A name pointer table entry can be used with [`Self::name_from_pointer`].
+    ///
+    /// An ordinal table entry is a 0-based index into the address table.
+    /// See [`Self::address_by_index`] and [`Self::target_by_index`].
+    pub fn name_iter(&self) -> impl Iterator<Item = (u32, u16)> + 'data {
+        self.names
+            .iter()
+            .map(|x| x.get(LE))
+            .zip(self.name_ordinals.iter().map(|x| x.get(LE)))
+    }
+
+    /// Returns the export address table entry at the given address index.
+    ///
+    /// This may be a local address, or the address of a forwarded export entry.
+    /// See [`Self::is_forward`] and [`Self::target_from_address`].
+    ///
+    /// `index` is a 0-based index into the export address table.
+    pub fn address_by_index(&self, index: u32) -> Result<u32> {
+        Ok(self
+            .addresses
+            .get(index as usize)
+            .read_error("Invalid PE export address index")?
+            .get(LE))
+    }
+
+    /// Returns the export address table entry at the given ordinal.
+    ///
+    /// This may be a local address, or the address of a forwarded export entry.
+    /// See [`Self::is_forward`] and [`Self::target_from_address`].
+    pub fn address_by_ordinal(&self, ordinal: u32) -> Result<u32> {
+        self.address_by_index(ordinal.wrapping_sub(self.ordinal_base()))
+    }
+
+    /// Returns the target of the export at the given address index.
+    ///
+    /// `index` is a 0-based index into the export address table.
+    pub fn target_by_index(&self, index: u32) -> Result<ExportTarget<'data>> {
+        self.target_from_address(self.address_by_index(index)?)
+    }
+
+    /// Returns the target of the export at the given ordinal.
+    pub fn target_by_ordinal(&self, ordinal: u32) -> Result<ExportTarget<'data>> {
+        self.target_from_address(self.address_by_ordinal(ordinal)?)
+    }
+
+    /// Convert an export address table entry into a target.
+    pub fn target_from_address(&self, address: u32) -> Result<ExportTarget<'data>> {
+        Ok(if let Some(forward) = self.forward_string(address)? {
+            let i = forward
+                .iter()
+                .position(|x| *x == b'.')
+                .read_error("Missing PE forwarded export separator")?;
+            let library = &forward[..i];
+            match &forward[i + 1..] {
+                [b'#', digits @ ..] => {
+                    let ordinal =
+                        parse_ordinal(digits).read_error("Invalid PE forwarded export ordinal")?;
+                    ExportTarget::ForwardByOrdinal(library, ordinal)
+                }
+                [] => {
+                    return Err(Error("Missing PE forwarded export name"));
+                }
+                name => ExportTarget::ForwardByName(library, name),
+            }
+        } else {
+            ExportTarget::Address(address)
+        })
+    }
+
+    fn forward_offset(&self, address: u32) -> Option<usize> {
+        let offset = address.wrapping_sub(self.virtual_address) as usize;
+        if offset < self.data.len() {
+            Some(offset)
+        } else {
+            None
+        }
+    }
+
+    /// Return true if the export address table entry is a forward.
+    pub fn is_forward(&self, address: u32) -> bool {
+        self.forward_offset(address).is_some()
+    }
+
+    /// Return the forward string if the export address table entry is a forward.
+    pub fn forward_string(&self, address: u32) -> Result<Option<&'data [u8]>> {
+        if let Some(offset) = self.forward_offset(address) {
+            self.data
+                .read_string_at(offset)
+                .read_error("Invalid PE forwarded export address")
+                .map(Some)
+        } else {
+            Ok(None)
+        }
+    }
+
+    /// Convert an export name pointer table entry into a name.
+    pub fn name_from_pointer(&self, name_pointer: u32) -> Result<&'data [u8]> {
+        let offset = name_pointer.wrapping_sub(self.virtual_address);
+        self.data
+            .read_string_at(offset as usize)
+            .read_error("Invalid PE export name pointer")
+    }
+
+    /// Returns the parsed exports in this table.
+    pub fn exports(&self) -> Result<Vec<Export<'data>>> {
+        // First, let's list all exports.
+        let mut exports = Vec::new();
+        let ordinal_base = self.ordinal_base();
+        for (i, address) in self.addresses.iter().enumerate() {
+            // Convert from an array index to an ordinal.
+            let ordinal = ordinal_base.wrapping_add(i as u32);
+            let target = self.target_from_address(address.get(LE))?;
+            exports.push(Export {
+                ordinal,
+                target,
+                // Might be populated later.
+                name: None,
+            });
+        }
+
+        // Now, check whether some (or all) of them have an associated name.
+        // `ordinal_index` is a 0-based index into `addresses`.
+        for (name_pointer, ordinal_index) in self.name_iter() {
+            let name = self.name_from_pointer(name_pointer)?;
+            exports
+                .get_mut(ordinal_index as usize)
+                .read_error("Invalid PE export ordinal")?
+                .name = Some(name);
+        }
+
+        Ok(exports)
+    }
+}
+
+fn parse_ordinal(digits: &[u8]) -> Option<u32> {
+    if digits.is_empty() {
+        return None;
+    }
+    let mut result: u32 = 0;
+    for &c in digits {
+        let x = (c as char).to_digit(10)?;
+        result = result.checked_mul(10)?.checked_add(x)?;
+    }
+    Some(result)
+}

vendor/object/src/read/pe/import.rs

@@ -0,0 +1,337 @@
+use core::fmt::Debug;
+use core::mem;
+
+use crate::read::{Bytes, ReadError, Result};
+use crate::{pe, LittleEndian as LE, Pod, U16Bytes};
+
+use super::ImageNtHeaders;
+
+/// Information for parsing a PE import table.
+///
+/// Returned by [`DataDirectories::import_table`](super::DataDirectories::import_table).
+#[derive(Debug, Clone)]
+pub struct ImportTable<'data> {
+    section_data: Bytes<'data>,
+    section_address: u32,
+    import_address: u32,
+}
+
+impl<'data> ImportTable<'data> {
+    /// Create a new import table parser.
+    ///
+    /// The import descriptors start at `import_address`.
+    /// The size declared in the `IMAGE_DIRECTORY_ENTRY_IMPORT` data directory is
+    /// ignored by the Windows loader, and so descriptors will be parsed until a null entry.
+    ///
+    /// `section_data` should be from the section containing `import_address`, and
+    /// `section_address` should be the address of that section. Pointers within the
+    /// descriptors and thunks may point to anywhere within the section data.
+    pub fn new(section_data: &'data [u8], section_address: u32, import_address: u32) -> Self {
+        ImportTable {
+            section_data: Bytes(section_data),
+            section_address,
+            import_address,
+        }
+    }
+
+    /// Return an iterator for the import descriptors.
+    pub fn descriptors(&self) -> Result<ImportDescriptorIterator<'data>> {
+        let offset = self.import_address.wrapping_sub(self.section_address);
+        let mut data = self.section_data;
+        data.skip(offset as usize)
+            .read_error("Invalid PE import descriptor address")?;
+        Ok(ImportDescriptorIterator { data })
+    }
+
+    /// Return a library name given its address.
+    ///
+    /// This address may be from [`pe::ImageImportDescriptor::name`].
+    pub fn name(&self, address: u32) -> Result<&'data [u8]> {
+        self.section_data
+            .read_string_at(address.wrapping_sub(self.section_address) as usize)
+            .read_error("Invalid PE import descriptor name")
+    }
+
+    /// Return a list of thunks given its address.
+    ///
+    /// This address may be from [`pe::ImageImportDescriptor::original_first_thunk`]
+    /// or [`pe::ImageImportDescriptor::first_thunk`].
+    pub fn thunks(&self, address: u32) -> Result<ImportThunkList<'data>> {
+        let offset = address.wrapping_sub(self.section_address);
+        let mut data = self.section_data;
+        data.skip(offset as usize)
+            .read_error("Invalid PE import thunk table address")?;
+        Ok(ImportThunkList { data })
+    }
+
+    /// Parse a thunk.
+    pub fn import<Pe: ImageNtHeaders>(&self, thunk: Pe::ImageThunkData) -> Result<Import<'data>> {
+        if thunk.is_ordinal() {
+            Ok(Import::Ordinal(thunk.ordinal()))
+        } else {
+            let (hint, name) = self.hint_name(thunk.address())?;
+            Ok(Import::Name(hint, name))
+        }
+    }
+
+    /// Return the hint and name at the given address.
+    ///
+    /// This address may be from [`pe::ImageThunkData32`] or [`pe::ImageThunkData64`].
+    ///
+    /// The hint is an index into the export name pointer table in the target library.
+    pub fn hint_name(&self, address: u32) -> Result<(u16, &'data [u8])> {
+        let offset = address.wrapping_sub(self.section_address);
+        let mut data = self.section_data;
+        data.skip(offset as usize)
+            .read_error("Invalid PE import thunk address")?;
+        let hint = data
+            .read::<U16Bytes<LE>>()
+            .read_error("Missing PE import thunk hint")?
+            .get(LE);
+        let name = data
+            .read_string()
+            .read_error("Missing PE import thunk name")?;
+        Ok((hint, name))
+    }
+}
+
+/// A fallible iterator for the descriptors in the import data directory.
+#[derive(Debug, Clone)]
+pub struct ImportDescriptorIterator<'data> {
+    data: Bytes<'data>,
+}
+
+impl<'data> ImportDescriptorIterator<'data> {
+    /// Return the next descriptor.
+    ///
+    /// Returns `Ok(None)` when a null descriptor is found.
+    pub fn next(&mut self) -> Result<Option<&'data pe::ImageImportDescriptor>> {
+        let import_desc = self
+            .data
+            .read::<pe::ImageImportDescriptor>()
+            .read_error("Missing PE null import descriptor")?;
+        if import_desc.is_null() {
+            Ok(None)
+        } else {
+            Ok(Some(import_desc))
+        }
+    }
+}
+
+/// A list of import thunks.
+///
+/// These may be in the import lookup table, or the import address table.
+#[derive(Debug, Clone)]
+pub struct ImportThunkList<'data> {
+    data: Bytes<'data>,
+}
+
+impl<'data> ImportThunkList<'data> {
+    /// Get the thunk at the given index.
+    pub fn get<Pe: ImageNtHeaders>(&self, index: usize) -> Result<Pe::ImageThunkData> {
+        let thunk = self
+            .data
+            .read_at(index * mem::size_of::<Pe::ImageThunkData>())
+            .read_error("Invalid PE import thunk index")?;
+        Ok(*thunk)
+    }
+
+    /// Return the first thunk in the list, and update `self` to point after it.
+    ///
+    /// Returns `Ok(None)` when a null thunk is found.
+    pub fn next<Pe: ImageNtHeaders>(&mut self) -> Result<Option<Pe::ImageThunkData>> {
+        let thunk = self
+            .data
+            .read::<Pe::ImageThunkData>()
+            .read_error("Missing PE null import thunk")?;
+        if thunk.address() == 0 {
+            Ok(None)
+        } else {
+            Ok(Some(*thunk))
+        }
+    }
+}
+
+/// A parsed import thunk.
+#[derive(Debug, Clone, Copy)]
+pub enum Import<'data> {
+    /// Import by ordinal.
+    Ordinal(u16),
+    /// Import by name.
+    ///
+    /// Includes a hint for the index into the export name pointer table in the target library.
+    Name(u16, &'data [u8]),
+}
+
+/// A trait for generic access to [`pe::ImageThunkData32`] and [`pe::ImageThunkData64`].
+#[allow(missing_docs)]
+pub trait ImageThunkData: Debug + Pod {
+    /// Return the raw thunk value.
+    fn raw(self) -> u64;
+
+    /// Returns true if the ordinal flag is set.
+    fn is_ordinal(self) -> bool;
+
+    /// Return the ordinal portion of the thunk.
+    ///
+    /// Does not check the ordinal flag.
+    fn ordinal(self) -> u16;
+
+    /// Return the RVA portion of the thunk.
+    ///
+    /// Does not check the ordinal flag.
+    fn address(self) -> u32;
+}
+
+impl ImageThunkData for pe::ImageThunkData64 {
+    fn raw(self) -> u64 {
+        self.0.get(LE)
+    }
+
+    fn is_ordinal(self) -> bool {
+        self.0.get(LE) & pe::IMAGE_ORDINAL_FLAG64 != 0
+    }
+
+    fn ordinal(self) -> u16 {
+        self.0.get(LE) as u16
+    }
+
+    fn address(self) -> u32 {
+        self.0.get(LE) as u32 & 0x7fff_ffff
+    }
+}
+
+impl ImageThunkData for pe::ImageThunkData32 {
+    fn raw(self) -> u64 {
+        self.0.get(LE).into()
+    }
+
+    fn is_ordinal(self) -> bool {
+        self.0.get(LE) & pe::IMAGE_ORDINAL_FLAG32 != 0
+    }
+
+    fn ordinal(self) -> u16 {
+        self.0.get(LE) as u16
+    }
+
+    fn address(self) -> u32 {
+        self.0.get(LE) & 0x7fff_ffff
+    }
+}
+
+/// Information for parsing a PE delay-load import table.
+///
+/// Returned by
+/// [`DataDirectories::delay_load_import_table`](super::DataDirectories::delay_load_import_table).
+#[derive(Debug, Clone)]
+pub struct DelayLoadImportTable<'data> {
+    section_data: Bytes<'data>,
+    section_address: u32,
+    import_address: u32,
+}
+
+impl<'data> DelayLoadImportTable<'data> {
+    /// Create a new delay load import table parser.
+    ///
+    /// The import descriptors start at `import_address`.
+    /// This table works in the same way the import table does: descriptors will be
+    /// parsed until a null entry.
+    ///
+    /// `section_data` should be from the section containing `import_address`, and
+    /// `section_address` should be the address of that section. Pointers within the
+    /// descriptors and thunks may point to anywhere within the section data.
+    pub fn new(section_data: &'data [u8], section_address: u32, import_address: u32) -> Self {
+        DelayLoadImportTable {
+            section_data: Bytes(section_data),
+            section_address,
+            import_address,
+        }
+    }
+
+    /// Return an iterator for the import descriptors.
+    pub fn descriptors(&self) -> Result<DelayLoadDescriptorIterator<'data>> {
+        let offset = self.import_address.wrapping_sub(self.section_address);
+        let mut data = self.section_data;
+        data.skip(offset as usize)
+            .read_error("Invalid PE delay-load import descriptor address")?;
+        Ok(DelayLoadDescriptorIterator { data })
+    }
+
+    /// Return a library name given its address.
+    ///
+    /// This address may be from [`pe::ImageDelayloadDescriptor::dll_name_rva`].
+    pub fn name(&self, address: u32) -> Result<&'data [u8]> {
+        self.section_data
+            .read_string_at(address.wrapping_sub(self.section_address) as usize)
+            .read_error("Invalid PE import descriptor name")
+    }
+
+    /// Return a list of thunks given its address.
+    ///
+    /// This address may be from the INT, i.e. from
+    /// [`pe::ImageDelayloadDescriptor::import_name_table_rva`].
+    ///
+    /// Please note that others RVA values from [`pe::ImageDelayloadDescriptor`] are used
+    /// by the delay loader at runtime to store values, and thus do not point inside the same
+    /// section as the INT. Calling this function on those addresses will fail.
+    pub fn thunks(&self, address: u32) -> Result<ImportThunkList<'data>> {
+        let offset = address.wrapping_sub(self.section_address);
+        let mut data = self.section_data;
+        data.skip(offset as usize)
+            .read_error("Invalid PE delay load import thunk table address")?;
+        Ok(ImportThunkList { data })
+    }
+
+    /// Parse a thunk.
+    pub fn import<Pe: ImageNtHeaders>(&self, thunk: Pe::ImageThunkData) -> Result<Import<'data>> {
+        if thunk.is_ordinal() {
+            Ok(Import::Ordinal(thunk.ordinal()))
+        } else {
+            let (hint, name) = self.hint_name(thunk.address())?;
+            Ok(Import::Name(hint, name))
+        }
+    }
+
+    /// Return the hint and name at the given address.
+    ///
+    /// This address may be from [`pe::ImageThunkData32`] or [`pe::ImageThunkData64`].
+    ///
+    /// The hint is an index into the export name pointer table in the target library.
+    pub fn hint_name(&self, address: u32) -> Result<(u16, &'data [u8])> {
+        let offset = address.wrapping_sub(self.section_address);
+        let mut data = self.section_data;
+        data.skip(offset as usize)
+            .read_error("Invalid PE delay load import thunk address")?;
+        let hint = data
+            .read::<U16Bytes<LE>>()
+            .read_error("Missing PE delay load import thunk hint")?
+            .get(LE);
+        let name = data
+            .read_string()
+            .read_error("Missing PE delay load import thunk name")?;
+        Ok((hint, name))
+    }
+}
+
+/// A fallible iterator for the descriptors in the delay-load data directory.
+#[derive(Debug, Clone)]
+pub struct DelayLoadDescriptorIterator<'data> {
+    data: Bytes<'data>,
+}
+
+impl<'data> DelayLoadDescriptorIterator<'data> {
+    /// Return the next descriptor.
+    ///
+    /// Returns `Ok(None)` when a null descriptor is found.
+    pub fn next(&mut self) -> Result<Option<&'data pe::ImageDelayloadDescriptor>> {
+        let import_desc = self
+            .data
+            .read::<pe::ImageDelayloadDescriptor>()
+            .read_error("Missing PE null delay-load import descriptor")?;
+        if import_desc.is_null() {
+            Ok(None)
+        } else {
+            Ok(Some(import_desc))
+        }
+    }
+}

vendor/object/src/read/pe/mod.rs

@@ -0,0 +1,68 @@
+//! Support for reading PE files.
+//!
+//! Traits are used to abstract over the difference between PE32 and PE32+.
+//! The primary trait for this is [`ImageNtHeaders`].
+//!
+//! ## High level API
+//!
+//! [`PeFile`] implements the [`Object`](crate::read::Object) trait for
+//! PE files. [`PeFile`] is parameterised by [`ImageNtHeaders`] to allow
+//! reading both PE32 and PE32+. There are type aliases for these parameters
+//! ([`PeFile32`] and [`PeFile64`]).
+//!
+//! ## Low level API
+//!
+//! The [`ImageNtHeaders`] trait can be directly used to parse both
+//! [`pe::ImageNtHeaders32`] and [`pe::ImageNtHeaders64`].
+//!
+//! ### Example for low level API
+//!  ```no_run
+//! use object::pe;
+//! use object::read::pe::ImageNtHeaders;
+//! use std::error::Error;
+//! use std::fs;
+//!
+//! /// Reads a file and displays the name of each section.
+//! fn main() -> Result<(), Box<dyn Error>> {
+//! #   #[cfg(feature = "std")] {
+//!     let data = fs::read("path/to/binary")?;
+//!     let dos_header = pe::ImageDosHeader::parse(&*data)?;
+//!     let mut offset = dos_header.nt_headers_offset().into();
+//!     let (nt_headers, data_directories) = pe::ImageNtHeaders64::parse(&*data, &mut offset)?;
+//!     let sections = nt_headers.sections(&*data, offset)?;
+//!     let symbols = nt_headers.symbols(&*data)?;
+//!     for section in sections.iter() {
+//!         println!("{}", String::from_utf8_lossy(section.name(symbols.strings())?));
+//!     }
+//! #   }
+//!     Ok(())
+//! }
+//! ```
+#[cfg(doc)]
+use crate::pe;
+
+mod file;
+pub use file::*;
+
+mod section;
+pub use section::*;
+
+mod data_directory;
+pub use data_directory::*;
+
+mod export;
+pub use export::*;
+
+mod import;
+pub use import::*;
+
+mod relocation;
+pub use relocation::*;
+
+mod resource;
+pub use resource::*;
+
+mod rich;
+pub use rich::*;
+
+pub use super::coff::{SectionTable, SymbolTable};

vendor/object/src/read/pe/relocation.rs

@@ -0,0 +1,92 @@
+use core::slice;
+
+use crate::endian::{LittleEndian as LE, U16};
+use crate::pe;
+use crate::read::{Bytes, Error, ReadError, Result};
+
+/// An iterator over the relocation blocks in the `.reloc` section of a PE file.
+///
+/// Returned by [`DataDirectories::relocation_blocks`](super::DataDirectories::relocation_blocks).
+#[derive(Debug, Default, Clone, Copy)]
+pub struct RelocationBlockIterator<'data> {
+    data: Bytes<'data>,
+}
+
+impl<'data> RelocationBlockIterator<'data> {
+    /// Construct a new iterator from the data of the `.reloc` section.
+    pub fn new(data: &'data [u8]) -> Self {
+        RelocationBlockIterator { data: Bytes(data) }
+    }
+
+    /// Read the next relocation page.
+    pub fn next(&mut self) -> Result<Option<RelocationIterator<'data>>> {
+        if self.data.is_empty() {
+            return Ok(None);
+        }
+        let header = self
+            .data
+            .read::<pe::ImageBaseRelocation>()
+            .read_error("Invalid PE reloc section size")?;
+        let virtual_address = header.virtual_address.get(LE);
+        let size = header.size_of_block.get(LE);
+        if size <= 8 || size & 3 != 0 {
+            return Err(Error("Invalid PE reloc block size"));
+        }
+        let count = (size - 8) / 2;
+        let relocs = self
+            .data
+            .read_slice::<U16<LE>>(count as usize)
+            .read_error("Invalid PE reloc block size")?
+            .iter();
+        Ok(Some(RelocationIterator {
+            virtual_address,
+            size,
+            relocs,
+        }))
+    }
+}
+
+/// An iterator of the relocations in a block in the `.reloc` section of a PE file.
+#[derive(Debug, Clone)]
+pub struct RelocationIterator<'data> {
+    virtual_address: u32,
+    size: u32,
+    relocs: slice::Iter<'data, U16<LE>>,
+}
+
+impl<'data> RelocationIterator<'data> {
+    /// Return the virtual address of the page that this block of relocations applies to.
+    pub fn virtual_address(&self) -> u32 {
+        self.virtual_address
+    }
+
+    /// Return the size in bytes of this block of relocations.
+    pub fn size(&self) -> u32 {
+        self.size
+    }
+}
+
+impl<'data> Iterator for RelocationIterator<'data> {
+    type Item = Relocation;
+
+    fn next(&mut self) -> Option<Relocation> {
+        loop {
+            let reloc = self.relocs.next()?.get(LE);
+            if reloc != 0 {
+                return Some(Relocation {
+                    virtual_address: self.virtual_address.wrapping_add((reloc & 0xfff) as u32),
+                    typ: reloc >> 12,
+                });
+            }
+        }
+    }
+}
+
+/// A relocation in the `.reloc` section of a PE file.
+#[derive(Debug, Default, Clone, Copy)]
+pub struct Relocation {
+    /// The virtual address of the relocation.
+    pub virtual_address: u32,
+    /// One of the `pe::IMAGE_REL_BASED_*` constants.
+    pub typ: u16,
+}

vendor/object/src/read/pe/resource.rs

@@ -0,0 +1,209 @@
+use alloc::string::String;
+use core::char;
+
+use crate::read::{ReadError, ReadRef, Result};
+use crate::{pe, LittleEndian as LE, U16Bytes};
+
+/// The `.rsrc` section of a PE file.
+///
+/// Returned by [`DataDirectories::resource_directory`](super::DataDirectories::resource_directory).
+#[derive(Debug, Clone, Copy)]
+pub struct ResourceDirectory<'data> {
+    data: &'data [u8],
+}
+
+impl<'data> ResourceDirectory<'data> {
+    /// Construct from the data of the `.rsrc` section.
+    pub fn new(data: &'data [u8]) -> Self {
+        ResourceDirectory { data }
+    }
+
+    /// Parses the root resource directory.
+    pub fn root(&self) -> Result<ResourceDirectoryTable<'data>> {
+        ResourceDirectoryTable::parse(self.data, 0)
+    }
+}
+
+/// A table of resource entries.
+#[derive(Debug, Clone)]
+pub struct ResourceDirectoryTable<'data> {
+    /// The table header.
+    pub header: &'data pe::ImageResourceDirectory,
+    /// The table entries.
+    pub entries: &'data [pe::ImageResourceDirectoryEntry],
+}
+
+impl<'data> ResourceDirectoryTable<'data> {
+    fn parse(data: &'data [u8], offset: u32) -> Result<Self> {
+        let mut offset = u64::from(offset);
+        let header = data
+            .read::<pe::ImageResourceDirectory>(&mut offset)
+            .read_error("Invalid resource table header")?;
+        let entries_count = header.number_of_id_entries.get(LE) as usize
+            + header.number_of_named_entries.get(LE) as usize;
+        let entries = data
+            .read_slice::<pe::ImageResourceDirectoryEntry>(&mut offset, entries_count)
+            .read_error("Invalid resource table entries")?;
+        Ok(Self { header, entries })
+    }
+}
+
+impl pe::ImageResourceDirectoryEntry {
+    /// Returns true if the entry has a name, rather than an ID.
+    pub fn has_name(&self) -> bool {
+        self.name_or_id.get(LE) & pe::IMAGE_RESOURCE_NAME_IS_STRING != 0
+    }
+
+    /// Returns the section offset of the name.
+    ///
+    /// Valid if `has_name()` returns true.
+    fn name(&self) -> ResourceName {
+        let offset = self.name_or_id.get(LE) & !pe::IMAGE_RESOURCE_NAME_IS_STRING;
+        ResourceName { offset }
+    }
+
+    /// Returns the ID.
+    ///
+    /// Valid if `has_string_name()` returns false.
+    fn id(&self) -> u16 {
+        (self.name_or_id.get(LE) & 0x0000_FFFF) as u16
+    }
+
+    /// Returns the entry name
+    pub fn name_or_id(&self) -> ResourceNameOrId {
+        if self.has_name() {
+            ResourceNameOrId::Name(self.name())
+        } else {
+            ResourceNameOrId::Id(self.id())
+        }
+    }
+
+    /// Returns true if the entry is a subtable.
+    pub fn is_table(&self) -> bool {
+        self.offset_to_data_or_directory.get(LE) & pe::IMAGE_RESOURCE_DATA_IS_DIRECTORY != 0
+    }
+
+    /// Returns the section offset of the associated table or data.
+    pub fn data_offset(&self) -> u32 {
+        self.offset_to_data_or_directory.get(LE) & !pe::IMAGE_RESOURCE_DATA_IS_DIRECTORY
+    }
+
+    /// Returns the data associated to this directory entry.
+    pub fn data<'data>(
+        &self,
+        section: ResourceDirectory<'data>,
+    ) -> Result<ResourceDirectoryEntryData<'data>> {
+        if self.is_table() {
+            ResourceDirectoryTable::parse(section.data, self.data_offset())
+                .map(ResourceDirectoryEntryData::Table)
+        } else {
+            section
+                .data
+                .read_at::<pe::ImageResourceDataEntry>(self.data_offset().into())
+                .read_error("Invalid resource entry")
+                .map(ResourceDirectoryEntryData::Data)
+        }
+    }
+}
+
+/// Data associated with a resource directory entry.
+#[derive(Debug, Clone)]
+pub enum ResourceDirectoryEntryData<'data> {
+    /// A subtable entry.
+    Table(ResourceDirectoryTable<'data>),
+    /// A resource data entry.
+    Data(&'data pe::ImageResourceDataEntry),
+}
+
+impl<'data> ResourceDirectoryEntryData<'data> {
+    /// Converts to an option of table.
+    ///
+    /// Helper for iterator filtering.
+    pub fn table(self) -> Option<ResourceDirectoryTable<'data>> {
+        match self {
+            Self::Table(dir) => Some(dir),
+            _ => None,
+        }
+    }
+
+    /// Converts to an option of data entry.
+    ///
+    /// Helper for iterator filtering.
+    pub fn data(self) -> Option<&'data pe::ImageResourceDataEntry> {
+        match self {
+            Self::Data(rsc) => Some(rsc),
+            _ => None,
+        }
+    }
+}
+
+/// A resource name.
+#[derive(Debug, Clone, Copy)]
+pub struct ResourceName {
+    offset: u32,
+}
+
+impl ResourceName {
+    /// Converts to a `String`.
+    pub fn to_string_lossy(&self, directory: ResourceDirectory<'_>) -> Result<String> {
+        let d = self.data(directory)?.iter().map(|c| c.get(LE));
+
+        Ok(char::decode_utf16(d)
+            .map(|r| r.unwrap_or(char::REPLACEMENT_CHARACTER))
+            .collect::<String>())
+    }
+
+    /// Returns the string unicode buffer.
+    pub fn data<'data>(
+        &self,
+        directory: ResourceDirectory<'data>,
+    ) -> Result<&'data [U16Bytes<LE>]> {
+        let mut offset = u64::from(self.offset);
+        let len = directory
+            .data
+            .read::<U16Bytes<LE>>(&mut offset)
+            .read_error("Invalid resource name offset")?;
+        directory
+            .data
+            .read_slice::<U16Bytes<LE>>(&mut offset, len.get(LE).into())
+            .read_error("Invalid resource name length")
+    }
+
+    /// Returns the string buffer as raw bytes.
+    pub fn raw_data<'data>(&self, directory: ResourceDirectory<'data>) -> Result<&'data [u8]> {
+        self.data(directory).map(crate::pod::bytes_of_slice)
+    }
+}
+
+/// A resource name or ID.
+///
+/// Can be either a string or a numeric ID.
+#[derive(Debug)]
+pub enum ResourceNameOrId {
+    /// A resource name.
+    Name(ResourceName),
+    /// A resource ID.
+    Id(u16),
+}
+
+impl ResourceNameOrId {
+    /// Converts to an option of name.
+    ///
+    /// Helper for iterator filtering.
+    pub fn name(self) -> Option<ResourceName> {
+        match self {
+            Self::Name(name) => Some(name),
+            _ => None,
+        }
+    }
+
+    /// Converts to an option of ID.
+    ///
+    /// Helper for iterator filtering.
+    pub fn id(self) -> Option<u16> {
+        match self {
+            Self::Id(id) => Some(id),
+            _ => None,
+        }
+    }
+}

vendor/object/src/read/pe/rich.rs

@@ -0,0 +1,91 @@
+//! PE rich header handling
+
+use core::mem;
+
+use crate::pod::bytes_of_slice;
+use crate::read::Bytes;
+use crate::{pe, LittleEndian as LE, ReadRef, U32};
+
+/// Parsed information about a Rich Header.
+#[derive(Debug, Clone, Copy)]
+pub struct RichHeaderInfo<'data> {
+    /// The offset at which the rich header starts.
+    pub offset: usize,
+    /// The length (in bytes) of the rich header.
+    ///
+    /// This includes the payload, but also the 16-byte start sequence and the
+    /// 8-byte final "Rich" and XOR key.
+    pub length: usize,
+    /// The XOR key used to mask the rich header.
+    ///
+    /// Unless the file has been tampered with, it should be equal to a checksum
+    /// of the file header.
+    pub xor_key: u32,
+    masked_entries: &'data [pe::MaskedRichHeaderEntry],
+}
+
+/// A PE rich header entry after it has been unmasked.
+///
+/// See [`pe::MaskedRichHeaderEntry`].
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct RichHeaderEntry {
+    /// ID of the component.
+    pub comp_id: u32,
+    /// Number of times this component has been used when building this PE.
+    pub count: u32,
+}
+
+impl<'data> RichHeaderInfo<'data> {
+    /// Try to locate a rich header and its entries in the current PE file.
+    pub fn parse<R: ReadRef<'data>>(data: R, nt_header_offset: u64) -> Option<Self> {
+        // Locate the rich header, if any.
+        // It ends with the "Rich" string and an XOR key, before the NT header.
+        let data = data.read_bytes_at(0, nt_header_offset).map(Bytes).ok()?;
+        let end_marker_offset = memmem(data.0, b"Rich", 4)?;
+        let xor_key = *data.read_at::<U32<LE>>(end_marker_offset + 4).ok()?;
+
+        // It starts at the masked "DanS" string and 3 masked zeroes.
+        let masked_start_marker = U32::new(LE, 0x536e_6144 ^ xor_key.get(LE));
+        let start_header = [masked_start_marker, xor_key, xor_key, xor_key];
+        let start_sequence = bytes_of_slice(&start_header);
+        let start_marker_offset = memmem(&data.0[..end_marker_offset], start_sequence, 4)?;
+
+        // Extract the items between the markers.
+        let items_offset = start_marker_offset + start_sequence.len();
+        let items_len = end_marker_offset - items_offset;
+        let item_count = items_len / mem::size_of::<pe::MaskedRichHeaderEntry>();
+        let items = data.read_slice_at(items_offset, item_count).ok()?;
+        Some(RichHeaderInfo {
+            offset: start_marker_offset,
+            // Includes "Rich" marker and the XOR key.
+            length: end_marker_offset - start_marker_offset + 8,
+            xor_key: xor_key.get(LE),
+            masked_entries: items,
+        })
+    }
+
+    /// Returns an iterator over the unmasked entries.
+    pub fn unmasked_entries(&self) -> impl Iterator<Item = RichHeaderEntry> + 'data {
+        let xor_key = self.xor_key;
+        self.masked_entries
+            .iter()
+            .map(move |entry| RichHeaderEntry {
+                comp_id: entry.masked_comp_id.get(LE) ^ xor_key,
+                count: entry.masked_count.get(LE) ^ xor_key,
+            })
+    }
+}
+
+/// Find the offset of the first occurrence of needle in the data.
+///
+/// The offset must have the given alignment.
+fn memmem(data: &[u8], needle: &[u8], align: usize) -> Option<usize> {
+    let mut offset = 0;
+    loop {
+        if data.get(offset..)?.get(..needle.len())? == needle {
+            return Some(offset);
+        }
+        offset += align;
+    }
+}

vendor/object/src/read/pe/section.rs

@@ -0,0 +1,440 @@
+use core::marker::PhantomData;
+use core::{cmp, iter, slice, str};
+
+use crate::endian::LittleEndian as LE;
+use crate::pe;
+use crate::pe::ImageSectionHeader;
+use crate::read::{
+    self, CompressedData, CompressedFileRange, ObjectSection, ObjectSegment, ReadError, ReadRef,
+    Relocation, Result, SectionFlags, SectionIndex, SectionKind, SegmentFlags,
+};
+
+use super::{ImageNtHeaders, PeFile, SectionTable};
+
+/// An iterator for the loadable sections in a [`PeFile32`](super::PeFile32).
+pub type PeSegmentIterator32<'data, 'file, R = &'data [u8]> =
+    PeSegmentIterator<'data, 'file, pe::ImageNtHeaders32, R>;
+/// An iterator for the loadable sections in a [`PeFile64`](super::PeFile64).
+pub type PeSegmentIterator64<'data, 'file, R = &'data [u8]> =
+    PeSegmentIterator<'data, 'file, pe::ImageNtHeaders64, R>;
+
+/// An iterator for the loadable sections in a [`PeFile`].
+#[derive(Debug)]
+pub struct PeSegmentIterator<'data, 'file, Pe, R = &'data [u8]>
+where
+    Pe: ImageNtHeaders,
+    R: ReadRef<'data>,
+{
+    pub(super) file: &'file PeFile<'data, Pe, R>,
+    pub(super) iter: slice::Iter<'data, pe::ImageSectionHeader>,
+}
+
+impl<'data, 'file, Pe, R> Iterator for PeSegmentIterator<'data, 'file, Pe, R>
+where
+    Pe: ImageNtHeaders,
+    R: ReadRef<'data>,
+{
+    type Item = PeSegment<'data, 'file, Pe, R>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.iter.next().map(|section| PeSegment {
+            file: self.file,
+            section,
+        })
+    }
+}
+
+/// A loadable section in a [`PeFile32`](super::PeFile32).
+pub type PeSegment32<'data, 'file, R = &'data [u8]> =
+    PeSegment<'data, 'file, pe::ImageNtHeaders32, R>;
+/// A loadable section in a [`PeFile64`](super::PeFile64).
+pub type PeSegment64<'data, 'file, R = &'data [u8]> =
+    PeSegment<'data, 'file, pe::ImageNtHeaders64, R>;
+
+/// A loadable section in a [`PeFile`].
+///
+/// Most functionality is provided by the [`ObjectSegment`] trait implementation.
+#[derive(Debug)]
+pub struct PeSegment<'data, 'file, Pe, R = &'data [u8]>
+where
+    Pe: ImageNtHeaders,
+    R: ReadRef<'data>,
+{
+    file: &'file PeFile<'data, Pe, R>,
+    section: &'data pe::ImageSectionHeader,
+}
+
+impl<'data, 'file, Pe, R> read::private::Sealed for PeSegment<'data, 'file, Pe, R>
+where
+    Pe: ImageNtHeaders,
+    R: ReadRef<'data>,
+{
+}
+
+impl<'data, 'file, Pe, R> ObjectSegment<'data> for PeSegment<'data, 'file, Pe, R>
+where
+    Pe: ImageNtHeaders,
+    R: ReadRef<'data>,
+{
+    #[inline]
+    fn address(&self) -> u64 {
+        u64::from(self.section.virtual_address.get(LE)).wrapping_add(self.file.common.image_base)
+    }
+
+    #[inline]
+    fn size(&self) -> u64 {
+        u64::from(self.section.virtual_size.get(LE))
+    }
+
+    #[inline]
+    fn align(&self) -> u64 {
+        self.file.section_alignment()
+    }
+
+    #[inline]
+    fn file_range(&self) -> (u64, u64) {
+        let (offset, size) = self.section.pe_file_range();
+        (u64::from(offset), u64::from(size))
+    }
+
+    fn data(&self) -> Result<&'data [u8]> {
+        self.section.pe_data(self.file.data)
+    }
+
+    fn data_range(&self, address: u64, size: u64) -> Result<Option<&'data [u8]>> {
+        Ok(read::util::data_range(
+            self.data()?,
+            self.address(),
+            address,
+            size,
+        ))
+    }
+
+    #[inline]
+    fn name_bytes(&self) -> Result<Option<&[u8]>> {
+        self.section
+            .name(self.file.common.symbols.strings())
+            .map(Some)
+    }
+
+    #[inline]
+    fn name(&self) -> Result<Option<&str>> {
+        let name = self.section.name(self.file.common.symbols.strings())?;
+        Ok(Some(
+            str::from_utf8(name)
+                .ok()
+                .read_error("Non UTF-8 PE section name")?,
+        ))
+    }
+
+    #[inline]
+    fn flags(&self) -> SegmentFlags {
+        let characteristics = self.section.characteristics.get(LE);
+        SegmentFlags::Coff { characteristics }
+    }
+}
+
+/// An iterator for the sections in a [`PeFile32`](super::PeFile32).
+pub type PeSectionIterator32<'data, 'file, R = &'data [u8]> =
+    PeSectionIterator<'data, 'file, pe::ImageNtHeaders32, R>;
+/// An iterator for the sections in a [`PeFile64`](super::PeFile64).
+pub type PeSectionIterator64<'data, 'file, R = &'data [u8]> =
+    PeSectionIterator<'data, 'file, pe::ImageNtHeaders64, R>;
+
+/// An iterator for the sections in a [`PeFile`].
+#[derive(Debug)]
+pub struct PeSectionIterator<'data, 'file, Pe, R = &'data [u8]>
+where
+    Pe: ImageNtHeaders,
+    R: ReadRef<'data>,
+{
+    pub(super) file: &'file PeFile<'data, Pe, R>,
+    pub(super) iter: iter::Enumerate<slice::Iter<'data, pe::ImageSectionHeader>>,
+}
+
+impl<'data, 'file, Pe, R> Iterator for PeSectionIterator<'data, 'file, Pe, R>
+where
+    Pe: ImageNtHeaders,
+    R: ReadRef<'data>,
+{
+    type Item = PeSection<'data, 'file, Pe, R>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.iter.next().map(|(index, section)| PeSection {
+            file: self.file,
+            index: SectionIndex(index + 1),
+            section,
+        })
+    }
+}
+
+/// A section in a [`PeFile32`](super::PeFile32).
+pub type PeSection32<'data, 'file, R = &'data [u8]> =
+    PeSection<'data, 'file, pe::ImageNtHeaders32, R>;
+/// A section in a [`PeFile64`](super::PeFile64).
+pub type PeSection64<'data, 'file, R = &'data [u8]> =
+    PeSection<'data, 'file, pe::ImageNtHeaders64, R>;
+
+/// A section in a [`PeFile`].
+///
+/// Most functionality is provided by the [`ObjectSection`] trait implementation.
+#[derive(Debug)]
+pub struct PeSection<'data, 'file, Pe, R = &'data [u8]>
+where
+    Pe: ImageNtHeaders,
+    R: ReadRef<'data>,
+{
+    pub(super) file: &'file PeFile<'data, Pe, R>,
+    pub(super) index: SectionIndex,
+    pub(super) section: &'data pe::ImageSectionHeader,
+}
+
+impl<'data, 'file, Pe, R> read::private::Sealed for PeSection<'data, 'file, Pe, R>
+where
+    Pe: ImageNtHeaders,
+    R: ReadRef<'data>,
+{
+}
+
+impl<'data, 'file, Pe, R> ObjectSection<'data> for PeSection<'data, 'file, Pe, R>
+where
+    Pe: ImageNtHeaders,
+    R: ReadRef<'data>,
+{
+    type RelocationIterator = PeRelocationIterator<'data, 'file, R>;
+
+    #[inline]
+    fn index(&self) -> SectionIndex {
+        self.index
+    }
+
+    #[inline]
+    fn address(&self) -> u64 {
+        u64::from(self.section.virtual_address.get(LE)).wrapping_add(self.file.common.image_base)
+    }
+
+    #[inline]
+    fn size(&self) -> u64 {
+        u64::from(self.section.virtual_size.get(LE))
+    }
+
+    #[inline]
+    fn align(&self) -> u64 {
+        self.file.section_alignment()
+    }
+
+    #[inline]
+    fn file_range(&self) -> Option<(u64, u64)> {
+        let (offset, size) = self.section.pe_file_range();
+        if size == 0 {
+            None
+        } else {
+            Some((u64::from(offset), u64::from(size)))
+        }
+    }
+
+    fn data(&self) -> Result<&'data [u8]> {
+        self.section.pe_data(self.file.data)
+    }
+
+    fn data_range(&self, address: u64, size: u64) -> Result<Option<&'data [u8]>> {
+        Ok(read::util::data_range(
+            self.data()?,
+            self.address(),
+            address,
+            size,
+        ))
+    }
+
+    #[inline]
+    fn compressed_file_range(&self) -> Result<CompressedFileRange> {
+        Ok(CompressedFileRange::none(self.file_range()))
+    }
+
+    #[inline]
+    fn compressed_data(&self) -> Result<CompressedData<'data>> {
+        self.data().map(CompressedData::none)
+    }
+
+    #[inline]
+    fn name_bytes(&self) -> Result<&[u8]> {
+        self.section.name(self.file.common.symbols.strings())
+    }
+
+    #[inline]
+    fn name(&self) -> Result<&str> {
+        let name = self.name_bytes()?;
+        str::from_utf8(name)
+            .ok()
+            .read_error("Non UTF-8 PE section name")
+    }
+
+    #[inline]
+    fn segment_name_bytes(&self) -> Result<Option<&[u8]>> {
+        Ok(None)
+    }
+
+    #[inline]
+    fn segment_name(&self) -> Result<Option<&str>> {
+        Ok(None)
+    }
+
+    #[inline]
+    fn kind(&self) -> SectionKind {
+        self.section.kind()
+    }
+
+    fn relocations(&self) -> PeRelocationIterator<'data, 'file, R> {
+        PeRelocationIterator(PhantomData)
+    }
+
+    fn flags(&self) -> SectionFlags {
+        SectionFlags::Coff {
+            characteristics: self.section.characteristics.get(LE),
+        }
+    }
+}
+
+impl<'data> SectionTable<'data> {
+    /// Return the file offset of the given virtual address, and the size up
+    /// to the end of the section containing it.
+    ///
+    /// Returns `None` if no section contains the address.
+    pub fn pe_file_range_at(&self, va: u32) -> Option<(u32, u32)> {
+        self.iter().find_map(|section| section.pe_file_range_at(va))
+    }
+
+    /// Return the data starting at the given virtual address, up to the end of the
+    /// section containing it.
+    ///
+    /// Ignores sections with invalid data.
+    ///
+    /// Returns `None` if no section contains the address.
+    pub fn pe_data_at<R: ReadRef<'data>>(&self, data: R, va: u32) -> Option<&'data [u8]> {
+        self.iter().find_map(|section| section.pe_data_at(data, va))
+    }
+
+    /// Return the data of the section that contains the given virtual address in a PE file.
+    ///
+    /// Also returns the virtual address of that section.
+    ///
+    /// Ignores sections with invalid data.
+    pub fn pe_data_containing<R: ReadRef<'data>>(
+        &self,
+        data: R,
+        va: u32,
+    ) -> Option<(&'data [u8], u32)> {
+        self.iter()
+            .find_map(|section| section.pe_data_containing(data, va))
+    }
+
+    /// Return the section that contains a given virtual address.
+    pub fn section_containing(&self, va: u32) -> Option<&'data ImageSectionHeader> {
+        self.iter().find(|section| section.contains_rva(va))
+    }
+}
+
+impl pe::ImageSectionHeader {
+    /// Return the offset and size of the section in a PE file.
+    ///
+    /// The size of the range will be the minimum of the file size and virtual size.
+    pub fn pe_file_range(&self) -> (u32, u32) {
+        // Pointer and size will be zero for uninitialized data; we don't need to validate this.
+        let offset = self.pointer_to_raw_data.get(LE);
+        let size = cmp::min(self.virtual_size.get(LE), self.size_of_raw_data.get(LE));
+        (offset, size)
+    }
+
+    /// Return the file offset of the given virtual address, and the remaining size up
+    /// to the end of the section.
+    ///
+    /// Returns `None` if the section does not contain the address.
+    pub fn pe_file_range_at(&self, va: u32) -> Option<(u32, u32)> {
+        let section_va = self.virtual_address.get(LE);
+        let offset = va.checked_sub(section_va)?;
+        let (section_offset, section_size) = self.pe_file_range();
+        // Address must be within section (and not at its end).
+        if offset < section_size {
+            Some((section_offset.checked_add(offset)?, section_size - offset))
+        } else {
+            None
+        }
+    }
+
+    /// Return the virtual address and size of the section.
+    pub fn pe_address_range(&self) -> (u32, u32) {
+        (self.virtual_address.get(LE), self.virtual_size.get(LE))
+    }
+
+    /// Return the section data in a PE file.
+    ///
+    /// The length of the data will be the minimum of the file size and virtual size.
+    pub fn pe_data<'data, R: ReadRef<'data>>(&self, data: R) -> Result<&'data [u8]> {
+        let (offset, size) = self.pe_file_range();
+        data.read_bytes_at(offset.into(), size.into())
+            .read_error("Invalid PE section offset or size")
+    }
+
+    /// Return the data starting at the given virtual address, up to the end of the
+    /// section.
+    ///
+    /// Ignores sections with invalid data.
+    ///
+    /// Returns `None` if the section does not contain the address.
+    pub fn pe_data_at<'data, R: ReadRef<'data>>(&self, data: R, va: u32) -> Option<&'data [u8]> {
+        let (offset, size) = self.pe_file_range_at(va)?;
+        data.read_bytes_at(offset.into(), size.into()).ok()
+    }
+
+    /// Tests whether a given RVA is part of this section
+    pub fn contains_rva(&self, va: u32) -> bool {
+        let section_va = self.virtual_address.get(LE);
+        match va.checked_sub(section_va) {
+            None => false,
+            Some(offset) => {
+                // Address must be within section (and not at its end).
+                offset < self.virtual_size.get(LE)
+            }
+        }
+    }
+
+    /// Return the section data if it contains the given virtual address.
+    ///
+    /// Also returns the virtual address of that section.
+    ///
+    /// Ignores sections with invalid data.
+    pub fn pe_data_containing<'data, R: ReadRef<'data>>(
+        &self,
+        data: R,
+        va: u32,
+    ) -> Option<(&'data [u8], u32)> {
+        let section_va = self.virtual_address.get(LE);
+        let offset = va.checked_sub(section_va)?;
+        let (section_offset, section_size) = self.pe_file_range();
+        // Address must be within section (and not at its end).
+        if offset < section_size {
+            let section_data = data
+                .read_bytes_at(section_offset.into(), section_size.into())
+                .ok()?;
+            Some((section_data, section_va))
+        } else {
+            None
+        }
+    }
+}
+
+/// An iterator for the relocations in an [`PeSection`].
+///
+/// This is a stub that doesn't implement any functionality.
+#[derive(Debug)]
+pub struct PeRelocationIterator<'data, 'file, R = &'data [u8]>(
+    PhantomData<(&'data (), &'file (), R)>,
+);
+
+impl<'data, 'file, R> Iterator for PeRelocationIterator<'data, 'file, R> {
+    type Item = (u64, Relocation);
+
+    fn next(&mut self) -> Option<Self::Item> {
+        None
+    }
+}

vendor/object/src/read/read_cache.rs

@@ -0,0 +1,178 @@
+use core::ops::Range;
+use std::boxed::Box;
+use std::cell::RefCell;
+use std::collections::hash_map::Entry;
+use std::collections::HashMap;
+use std::convert::TryInto;
+use std::io::{Read, Seek, SeekFrom};
+use std::mem;
+use std::vec::Vec;
+
+use crate::read::ReadRef;
+
+/// An implementation of [`ReadRef`] for data in a stream that implements
+/// `Read + Seek`.
+///
+/// Contains a cache of read-only blocks of data, allowing references to
+/// them to be returned. Entries in the cache are never removed.
+/// Entries are keyed on the offset and size of the read.
+/// Currently overlapping reads are considered separate reads.
+#[derive(Debug)]
+pub struct ReadCache<R: Read + Seek> {
+    cache: RefCell<ReadCacheInternal<R>>,
+}
+
+#[derive(Debug)]
+struct ReadCacheInternal<R: Read + Seek> {
+    read: R,
+    bufs: HashMap<(u64, u64), Box<[u8]>>,
+    strings: HashMap<(u64, u8), Box<[u8]>>,
+}
+
+impl<R: Read + Seek> ReadCache<R> {
+    /// Create an empty `ReadCache` for the given stream.
+    pub fn new(read: R) -> Self {
+        ReadCache {
+            cache: RefCell::new(ReadCacheInternal {
+                read,
+                bufs: HashMap::new(),
+                strings: HashMap::new(),
+            }),
+        }
+    }
+
+    /// Return an implementation of `ReadRef` that restricts reads
+    /// to the given range of the stream.
+    pub fn range(&self, offset: u64, size: u64) -> ReadCacheRange<'_, R> {
+        ReadCacheRange {
+            r: self,
+            offset,
+            size,
+        }
+    }
+
+    /// Free buffers used by the cache.
+    pub fn clear(&mut self) {
+        self.cache.borrow_mut().bufs.clear();
+    }
+
+    /// Unwrap this `ReadCache<R>`, returning the underlying reader.
+    pub fn into_inner(self) -> R {
+        self.cache.into_inner().read
+    }
+}
+
+impl<'a, R: Read + Seek> ReadRef<'a> for &'a ReadCache<R> {
+    fn len(self) -> Result<u64, ()> {
+        let cache = &mut *self.cache.borrow_mut();
+        cache.read.seek(SeekFrom::End(0)).map_err(|_| ())
+    }
+
+    fn read_bytes_at(self, offset: u64, size: u64) -> Result<&'a [u8], ()> {
+        if size == 0 {
+            return Ok(&[]);
+        }
+        let cache = &mut *self.cache.borrow_mut();
+        let buf = match cache.bufs.entry((offset, size)) {
+            Entry::Occupied(entry) => entry.into_mut(),
+            Entry::Vacant(entry) => {
+                let size = size.try_into().map_err(|_| ())?;
+                cache.read.seek(SeekFrom::Start(offset)).map_err(|_| ())?;
+                let mut bytes = vec![0; size].into_boxed_slice();
+                cache.read.read_exact(&mut bytes).map_err(|_| ())?;
+                entry.insert(bytes)
+            }
+        };
+        // Extend the lifetime to that of self.
+        // This is OK because we never mutate or remove entries.
+        Ok(unsafe { mem::transmute::<&[u8], &[u8]>(buf) })
+    }
+
+    fn read_bytes_at_until(self, range: Range<u64>, delimiter: u8) -> Result<&'a [u8], ()> {
+        let cache = &mut *self.cache.borrow_mut();
+        let buf = match cache.strings.entry((range.start, delimiter)) {
+            Entry::Occupied(entry) => entry.into_mut(),
+            Entry::Vacant(entry) => {
+                cache
+                    .read
+                    .seek(SeekFrom::Start(range.start))
+                    .map_err(|_| ())?;
+
+                let max_check: usize = (range.end - range.start).try_into().map_err(|_| ())?;
+                // Strings should be relatively small.
+                // TODO: make this configurable?
+                let max_check = max_check.min(4096);
+
+                let mut bytes = Vec::new();
+                let mut checked = 0;
+                loop {
+                    bytes.resize((checked + 256).min(max_check), 0);
+                    let read = cache.read.read(&mut bytes[checked..]).map_err(|_| ())?;
+                    if read == 0 {
+                        return Err(());
+                    }
+                    if let Some(len) = memchr::memchr(delimiter, &bytes[checked..][..read]) {
+                        bytes.truncate(checked + len);
+                        break entry.insert(bytes.into_boxed_slice());
+                    }
+                    checked += read;
+                    if checked >= max_check {
+                        return Err(());
+                    }
+                }
+            }
+        };
+        // Extend the lifetime to that of self.
+        // This is OK because we never mutate or remove entries.
+        Ok(unsafe { mem::transmute::<&[u8], &[u8]>(buf) })
+    }
+}
+
+/// An implementation of [`ReadRef`] for a range of data in a stream that
+/// implements `Read + Seek`.
+///
+/// Shares an underlying `ReadCache` with a lifetime of `'a`.
+#[derive(Debug)]
+pub struct ReadCacheRange<'a, R: Read + Seek> {
+    r: &'a ReadCache<R>,
+    offset: u64,
+    size: u64,
+}
+
+impl<'a, R: Read + Seek> Clone for ReadCacheRange<'a, R> {
+    fn clone(&self) -> Self {
+        *self
+    }
+}
+
+impl<'a, R: Read + Seek> Copy for ReadCacheRange<'a, R> {}
+
+impl<'a, R: Read + Seek> ReadRef<'a> for ReadCacheRange<'a, R> {
+    fn len(self) -> Result<u64, ()> {
+        Ok(self.size)
+    }
+
+    fn read_bytes_at(self, offset: u64, size: u64) -> Result<&'a [u8], ()> {
+        if size == 0 {
+            return Ok(&[]);
+        }
+        let end = offset.checked_add(size).ok_or(())?;
+        if end > self.size {
+            return Err(());
+        }
+        let r_offset = self.offset.checked_add(offset).ok_or(())?;
+        self.r.read_bytes_at(r_offset, size)
+    }
+
+    fn read_bytes_at_until(self, range: Range<u64>, delimiter: u8) -> Result<&'a [u8], ()> {
+        let r_start = self.offset.checked_add(range.start).ok_or(())?;
+        let r_end = self.offset.checked_add(range.end).ok_or(())?;
+        let bytes = self.r.read_bytes_at_until(r_start..r_end, delimiter)?;
+        let size = bytes.len().try_into().map_err(|_| ())?;
+        let end = range.start.checked_add(size).ok_or(())?;
+        if end > self.size {
+            return Err(());
+        }
+        Ok(bytes)
+    }
+}

vendor/object/src/read/read_ref.rs

@@ -0,0 +1,137 @@
+#![allow(clippy::len_without_is_empty)]
+
+use core::convert::TryInto;
+use core::ops::Range;
+use core::{mem, result};
+
+use crate::pod::{from_bytes, slice_from_bytes, Pod};
+
+type Result<T> = result::Result<T, ()>;
+
+/// A trait for reading references to [`Pod`] types from a block of data.
+///
+/// This allows parsers to handle both of these cases:
+/// - the block of data exists in memory, and it is desirable
+///   to use references to this block instead of copying it,
+/// - the block of data exists in storage, and it is desirable
+///   to read on demand to minimize I/O and memory usage.
+///
+/// The methods accept `self` by value because `Self` is expected to behave
+/// similar to a reference: it may be a reference with a lifetime of `'a`,
+/// or it may be a wrapper of a reference.
+///
+/// The `Clone` and `Copy` bounds are for convenience, and since `Self` is
+/// expected to be similar to a reference, these are easily satisfied.
+///
+/// Object file parsers typically use offsets to locate the structures
+/// in the block, and will most commonly use the `*_at` methods to
+/// read a structure at a known offset.
+///
+/// Occasionally file parsers will need to treat the block as a stream,
+/// and so convenience methods are provided that update an offset with
+/// the size that was read.
+//
+// An alternative would be for methods to accept `&mut self` and use a
+// `seek` method instead of the `offset` parameters, but this is less
+// convenient for implementers.
+pub trait ReadRef<'a>: Clone + Copy {
+    /// The total size of the block of data.
+    fn len(self) -> Result<u64>;
+
+    /// Get a reference to a `u8` slice at the given offset.
+    ///
+    /// Returns an error if offset or size are out of bounds.
+    fn read_bytes_at(self, offset: u64, size: u64) -> Result<&'a [u8]>;
+
+    /// Get a reference to a delimited `u8` slice which starts at range.start.
+    ///
+    /// Does not include the delimiter.
+    ///
+    /// Returns an error if the range is out of bounds or the delimiter is
+    /// not found in the range.
+    fn read_bytes_at_until(self, range: Range<u64>, delimiter: u8) -> Result<&'a [u8]>;
+
+    /// Get a reference to a `u8` slice at the given offset, and update the offset.
+    ///
+    /// Returns an error if offset or size are out of bounds.
+    fn read_bytes(self, offset: &mut u64, size: u64) -> Result<&'a [u8]> {
+        let bytes = self.read_bytes_at(*offset, size)?;
+        *offset = offset.wrapping_add(size);
+        Ok(bytes)
+    }
+
+    /// Get a reference to a `Pod` type at the given offset, and update the offset.
+    ///
+    /// Returns an error if offset or size are out of bounds.
+    ///
+    /// The default implementation uses `read_bytes`, and returns an error if
+    /// `read_bytes` does not return bytes with the correct alignment for `T`.
+    /// Implementors may want to provide their own implementation that ensures
+    /// the alignment can be satisfied. Alternatively, only use this method with
+    /// types that do not need alignment (see the `unaligned` feature of this crate).
+    fn read<T: Pod>(self, offset: &mut u64) -> Result<&'a T> {
+        let size = mem::size_of::<T>().try_into().map_err(|_| ())?;
+        let bytes = self.read_bytes(offset, size)?;
+        let (t, _) = from_bytes(bytes)?;
+        Ok(t)
+    }
+
+    /// Get a reference to a `Pod` type at the given offset.
+    ///
+    /// Returns an error if offset or size are out of bounds.
+    ///
+    /// Also see the `read` method for information regarding alignment of `T`.
+    fn read_at<T: Pod>(self, mut offset: u64) -> Result<&'a T> {
+        self.read(&mut offset)
+    }
+
+    /// Get a reference to a slice of a `Pod` type at the given offset, and update the offset.
+    ///
+    /// Returns an error if offset or size are out of bounds.
+    ///
+    /// Also see the `read` method for information regarding alignment of `T`.
+    fn read_slice<T: Pod>(self, offset: &mut u64, count: usize) -> Result<&'a [T]> {
+        let size = count
+            .checked_mul(mem::size_of::<T>())
+            .ok_or(())?
+            .try_into()
+            .map_err(|_| ())?;
+        let bytes = self.read_bytes(offset, size)?;
+        let (t, _) = slice_from_bytes(bytes, count)?;
+        Ok(t)
+    }
+
+    /// Get a reference to a slice of a `Pod` type at the given offset.
+    ///
+    /// Returns an error if offset or size are out of bounds.
+    ///
+    /// Also see the `read` method for information regarding alignment of `T`.
+    fn read_slice_at<T: Pod>(self, mut offset: u64, count: usize) -> Result<&'a [T]> {
+        self.read_slice(&mut offset, count)
+    }
+}
+
+impl<'a> ReadRef<'a> for &'a [u8] {
+    fn len(self) -> Result<u64> {
+        self.len().try_into().map_err(|_| ())
+    }
+
+    fn read_bytes_at(self, offset: u64, size: u64) -> Result<&'a [u8]> {
+        let offset: usize = offset.try_into().map_err(|_| ())?;
+        let size: usize = size.try_into().map_err(|_| ())?;
+        self.get(offset..).ok_or(())?.get(..size).ok_or(())
+    }
+
+    fn read_bytes_at_until(self, range: Range<u64>, delimiter: u8) -> Result<&'a [u8]> {
+        let start: usize = range.start.try_into().map_err(|_| ())?;
+        let end: usize = range.end.try_into().map_err(|_| ())?;
+        let bytes = self.get(start..end).ok_or(())?;
+        match memchr::memchr(delimiter, bytes) {
+            Some(len) => {
+                // This will never fail.
+                bytes.get(..len).ok_or(())
+            }
+            None => Err(()),
+        }
+    }
+}

vendor/object/src/read/traits.rs

@@ -0,0 +1,551 @@
+use alloc::borrow::Cow;
+use alloc::vec::Vec;
+
+use crate::read::{
+    self, Architecture, CodeView, ComdatKind, CompressedData, CompressedFileRange, Export,
+    FileFlags, Import, ObjectKind, ObjectMap, Relocation, Result, SectionFlags, SectionIndex,
+    SectionKind, SegmentFlags, SubArchitecture, SymbolFlags, SymbolIndex, SymbolKind, SymbolMap,
+    SymbolMapName, SymbolScope, SymbolSection,
+};
+use crate::Endianness;
+
+/// An object file.
+///
+/// This is the primary trait for the unified read API.
+pub trait Object<'data: 'file, 'file>: read::private::Sealed {
+    /// A loadable segment in the object file.
+    type Segment: ObjectSegment<'data>;
+
+    /// An iterator for the loadable segments in the object file.
+    type SegmentIterator: Iterator<Item = Self::Segment>;
+
+    /// A section in the object file.
+    type Section: ObjectSection<'data>;
+
+    /// An iterator for the sections in the object file.
+    type SectionIterator: Iterator<Item = Self::Section>;
+
+    /// A COMDAT section group in the object file.
+    type Comdat: ObjectComdat<'data>;
+
+    /// An iterator for the COMDAT section groups in the object file.
+    type ComdatIterator: Iterator<Item = Self::Comdat>;
+
+    /// A symbol in the object file.
+    type Symbol: ObjectSymbol<'data>;
+
+    /// An iterator for symbols in the object file.
+    type SymbolIterator: Iterator<Item = Self::Symbol>;
+
+    /// A symbol table in the object file.
+    type SymbolTable: ObjectSymbolTable<
+        'data,
+        Symbol = Self::Symbol,
+        SymbolIterator = Self::SymbolIterator,
+    >;
+
+    /// An iterator for the dynamic relocations in the file.
+    ///
+    /// The first field in the item tuple is the address
+    /// that the relocation applies to.
+    type DynamicRelocationIterator: Iterator<Item = (u64, Relocation)>;
+
+    /// Get the architecture type of the file.
+    fn architecture(&self) -> Architecture;
+
+    /// Get the sub-architecture type of the file if known.
+    ///
+    /// A value of `None` has a range of meanings: the file supports all
+    /// sub-architectures, the file does not explicitly specify a
+    /// sub-architecture, or the sub-architecture is currently unrecognized.
+    fn sub_architecture(&self) -> Option<SubArchitecture> {
+        None
+    }
+
+    /// Get the endianness of the file.
+    #[inline]
+    fn endianness(&self) -> Endianness {
+        if self.is_little_endian() {
+            Endianness::Little
+        } else {
+            Endianness::Big
+        }
+    }
+
+    /// Return true if the file is little endian, false if it is big endian.
+    fn is_little_endian(&self) -> bool;
+
+    /// Return true if the file can contain 64-bit addresses.
+    fn is_64(&self) -> bool;
+
+    /// Return the kind of this object.
+    fn kind(&self) -> ObjectKind;
+
+    /// Get an iterator for the loadable segments in the file.
+    ///
+    /// For ELF, this is program headers with type [`PT_LOAD`](crate::elf::PT_LOAD).
+    /// For Mach-O, this is load commands with type [`LC_SEGMENT`](crate::macho::LC_SEGMENT)
+    /// or [`LC_SEGMENT_64`](crate::macho::LC_SEGMENT_64).
+    /// For PE, this is all sections.
+    fn segments(&'file self) -> Self::SegmentIterator;
+
+    /// Get the section named `section_name`, if such a section exists.
+    ///
+    /// If `section_name` starts with a '.' then it is treated as a system section name,
+    /// and is compared using the conventions specific to the object file format. This
+    /// includes:
+    /// - if ".debug_str_offsets" is requested for a Mach-O object file, then the actual
+    /// section name that is searched for is "__debug_str_offs".
+    /// - if ".debug_info" is requested for an ELF object file, then
+    /// ".zdebug_info" may be returned (and similarly for other debug sections).
+    ///
+    /// For some object files, multiple segments may contain sections with the same
+    /// name. In this case, the first matching section will be used.
+    ///
+    /// This method skips over sections with invalid names.
+    fn section_by_name(&'file self, section_name: &str) -> Option<Self::Section> {
+        self.section_by_name_bytes(section_name.as_bytes())
+    }
+
+    /// Like [`Self::section_by_name`], but allows names that are not UTF-8.
+    fn section_by_name_bytes(&'file self, section_name: &[u8]) -> Option<Self::Section>;
+
+    /// Get the section at the given index.
+    ///
+    /// The meaning of the index depends on the object file.
+    ///
+    /// For some object files, this requires iterating through all sections.
+    ///
+    /// Returns an error if the index is invalid.
+    fn section_by_index(&'file self, index: SectionIndex) -> Result<Self::Section>;
+
+    /// Get an iterator for the sections in the file.
+    fn sections(&'file self) -> Self::SectionIterator;
+
+    /// Get an iterator for the COMDAT section groups in the file.
+    fn comdats(&'file self) -> Self::ComdatIterator;
+
+    /// Get the debugging symbol table, if any.
+    fn symbol_table(&'file self) -> Option<Self::SymbolTable>;
+
+    /// Get the debugging symbol at the given index.
+    ///
+    /// The meaning of the index depends on the object file.
+    ///
+    /// Returns an error if the index is invalid.
+    fn symbol_by_index(&'file self, index: SymbolIndex) -> Result<Self::Symbol>;
+
+    /// Get an iterator for the debugging symbols in the file.
+    ///
+    /// This may skip over symbols that are malformed or unsupported.
+    ///
+    /// For Mach-O files, this does not include STAB entries.
+    fn symbols(&'file self) -> Self::SymbolIterator;
+
+    /// Get the symbol named `symbol_name`, if the symbol exists.
+    fn symbol_by_name(&'file self, symbol_name: &str) -> Option<Self::Symbol> {
+        self.symbol_by_name_bytes(symbol_name.as_bytes())
+    }
+
+    /// Like [`Self::symbol_by_name`], but allows names that are not UTF-8.
+    fn symbol_by_name_bytes(&'file self, symbol_name: &[u8]) -> Option<Self::Symbol> {
+        self.symbols()
+            .find(|sym| sym.name_bytes() == Ok(symbol_name))
+    }
+
+    /// Get the dynamic linking symbol table, if any.
+    ///
+    /// Only ELF has a separate dynamic linking symbol table.
+    /// Consider using [`Self::exports`] or [`Self::imports`] instead.
+    fn dynamic_symbol_table(&'file self) -> Option<Self::SymbolTable>;
+
+    /// Get an iterator for the dynamic linking symbols in the file.
+    ///
+    /// This may skip over symbols that are malformed or unsupported.
+    ///
+    /// Only ELF has dynamic linking symbols.
+    /// Other file formats will return an empty iterator.
+    /// Consider using [`Self::exports`] or [`Self::imports`] instead.
+    fn dynamic_symbols(&'file self) -> Self::SymbolIterator;
+
+    /// Get the dynamic relocations for this file.
+    ///
+    /// Symbol indices in these relocations refer to the dynamic symbol table.
+    ///
+    /// Only ELF has dynamic relocations.
+    fn dynamic_relocations(&'file self) -> Option<Self::DynamicRelocationIterator>;
+
+    /// Construct a map from addresses to symbol names.
+    ///
+    /// The map will only contain defined text and data symbols.
+    /// The dynamic symbol table will only be used if there are no debugging symbols.
+    fn symbol_map(&'file self) -> SymbolMap<SymbolMapName<'data>> {
+        let mut symbols = Vec::new();
+        if let Some(table) = self.symbol_table().or_else(|| self.dynamic_symbol_table()) {
+            // Sometimes symbols share addresses. Collect them all then choose the "best".
+            let mut all_symbols = Vec::new();
+            for symbol in table.symbols() {
+                // Must have an address.
+                if !symbol.is_definition() {
+                    continue;
+                }
+                // Must have a name.
+                let name = match symbol.name() {
+                    Ok(name) => name,
+                    _ => continue,
+                };
+                if name.is_empty() {
+                    continue;
+                }
+
+                // Lower is better.
+                let mut priority = 0u32;
+
+                // Prefer known kind.
+                match symbol.kind() {
+                    SymbolKind::Text | SymbolKind::Data => {}
+                    SymbolKind::Unknown => priority += 1,
+                    _ => continue,
+                }
+                priority *= 2;
+
+                // Prefer global visibility.
+                priority += match symbol.scope() {
+                    SymbolScope::Unknown => 3,
+                    SymbolScope::Compilation => 2,
+                    SymbolScope::Linkage => 1,
+                    SymbolScope::Dynamic => 0,
+                };
+                priority *= 4;
+
+                // Prefer later entries (earlier symbol is likely to be less specific).
+                let index = !0 - symbol.index().0;
+
+                // Tuple is ordered for sort.
+                all_symbols.push((symbol.address(), priority, index, name));
+            }
+            // Unstable sort is okay because tuple includes index.
+            all_symbols.sort_unstable();
+
+            let mut previous_address = !0;
+            for (address, _priority, _index, name) in all_symbols {
+                if address != previous_address {
+                    symbols.push(SymbolMapName::new(address, name));
+                    previous_address = address;
+                }
+            }
+        }
+        SymbolMap::new(symbols)
+    }
+
+    /// Construct a map from addresses to symbol names and object file names.
+    ///
+    /// This is derived from Mach-O STAB entries.
+    fn object_map(&'file self) -> ObjectMap<'data> {
+        ObjectMap::default()
+    }
+
+    /// Get the imported symbols.
+    fn imports(&self) -> Result<Vec<Import<'data>>>;
+
+    /// Get the exported symbols that expose both a name and an address.
+    ///
+    /// Some file formats may provide other kinds of symbols that can be retrieved using
+    /// the low level API.
+    fn exports(&self) -> Result<Vec<Export<'data>>>;
+
+    /// Return true if the file contains DWARF debug information sections, false if not.
+    fn has_debug_symbols(&self) -> bool;
+
+    /// The UUID from a Mach-O [`LC_UUID`](crate::macho::LC_UUID) load command.
+    #[inline]
+    fn mach_uuid(&self) -> Result<Option<[u8; 16]>> {
+        Ok(None)
+    }
+
+    /// The build ID from an ELF [`NT_GNU_BUILD_ID`](crate::elf::NT_GNU_BUILD_ID) note.
+    #[inline]
+    fn build_id(&self) -> Result<Option<&'data [u8]>> {
+        Ok(None)
+    }
+
+    /// The filename and CRC from a `.gnu_debuglink` section.
+    #[inline]
+    fn gnu_debuglink(&self) -> Result<Option<(&'data [u8], u32)>> {
+        Ok(None)
+    }
+
+    /// The filename and build ID from a `.gnu_debugaltlink` section.
+    #[inline]
+    fn gnu_debugaltlink(&self) -> Result<Option<(&'data [u8], &'data [u8])>> {
+        Ok(None)
+    }
+
+    /// The filename and GUID from the PE CodeView section.
+    #[inline]
+    fn pdb_info(&self) -> Result<Option<CodeView<'_>>> {
+        Ok(None)
+    }
+
+    /// Get the base address used for relative virtual addresses.
+    ///
+    /// Currently this is only non-zero for PE.
+    fn relative_address_base(&'file self) -> u64;
+
+    /// Get the virtual address of the entry point of the binary.
+    fn entry(&'file self) -> u64;
+
+    /// File flags that are specific to each file format.
+    fn flags(&self) -> FileFlags;
+}
+
+/// A loadable segment in an [`Object`].
+///
+/// This trait is part of the unified read API.
+pub trait ObjectSegment<'data>: read::private::Sealed {
+    /// Returns the virtual address of the segment.
+    fn address(&self) -> u64;
+
+    /// Returns the size of the segment in memory.
+    fn size(&self) -> u64;
+
+    /// Returns the alignment of the segment in memory.
+    fn align(&self) -> u64;
+
+    /// Returns the offset and size of the segment in the file.
+    fn file_range(&self) -> (u64, u64);
+
+    /// Returns a reference to the file contents of the segment.
+    ///
+    /// The length of this data may be different from the size of the
+    /// segment in memory.
+    fn data(&self) -> Result<&'data [u8]>;
+
+    /// Return the segment data in the given range.
+    ///
+    /// Returns `Ok(None)` if the segment does not contain the given range.
+    fn data_range(&self, address: u64, size: u64) -> Result<Option<&'data [u8]>>;
+
+    /// Returns the name of the segment.
+    fn name_bytes(&self) -> Result<Option<&[u8]>>;
+
+    /// Returns the name of the segment.
+    ///
+    /// Returns an error if the name is not UTF-8.
+    fn name(&self) -> Result<Option<&str>>;
+
+    /// Return the flags of segment.
+    fn flags(&self) -> SegmentFlags;
+}
+
+/// A section in an [`Object`].
+///
+/// This trait is part of the unified read API.
+pub trait ObjectSection<'data>: read::private::Sealed {
+    /// An iterator for the relocations for a section.
+    ///
+    /// The first field in the item tuple is the section offset
+    /// that the relocation applies to.
+    type RelocationIterator: Iterator<Item = (u64, Relocation)>;
+
+    /// Returns the section index.
+    fn index(&self) -> SectionIndex;
+
+    /// Returns the address of the section.
+    fn address(&self) -> u64;
+
+    /// Returns the size of the section in memory.
+    fn size(&self) -> u64;
+
+    /// Returns the alignment of the section in memory.
+    fn align(&self) -> u64;
+
+    /// Returns offset and size of on-disk segment (if any).
+    fn file_range(&self) -> Option<(u64, u64)>;
+
+    /// Returns the raw contents of the section.
+    ///
+    /// The length of this data may be different from the size of the
+    /// section in memory.
+    ///
+    /// This does not do any decompression.
+    fn data(&self) -> Result<&'data [u8]>;
+
+    /// Return the raw contents of the section data in the given range.
+    ///
+    /// This does not do any decompression.
+    ///
+    /// Returns `Ok(None)` if the section does not contain the given range.
+    fn data_range(&self, address: u64, size: u64) -> Result<Option<&'data [u8]>>;
+
+    /// Returns the potentially compressed file range of the section,
+    /// along with information about the compression.
+    fn compressed_file_range(&self) -> Result<CompressedFileRange>;
+
+    /// Returns the potentially compressed contents of the section,
+    /// along with information about the compression.
+    fn compressed_data(&self) -> Result<CompressedData<'data>>;
+
+    /// Returns the uncompressed contents of the section.
+    ///
+    /// The length of this data may be different from the size of the
+    /// section in memory.
+    ///
+    /// If no compression is detected, then returns the data unchanged.
+    /// Returns `Err` if decompression fails.
+    fn uncompressed_data(&self) -> Result<Cow<'data, [u8]>> {
+        self.compressed_data()?.decompress()
+    }
+
+    /// Returns the name of the section.
+    fn name_bytes(&self) -> Result<&[u8]>;
+
+    /// Returns the name of the section.
+    ///
+    /// Returns an error if the name is not UTF-8.
+    fn name(&self) -> Result<&str>;
+
+    /// Returns the name of the segment for this section.
+    fn segment_name_bytes(&self) -> Result<Option<&[u8]>>;
+
+    /// Returns the name of the segment for this section.
+    ///
+    /// Returns an error if the name is not UTF-8.
+    fn segment_name(&self) -> Result<Option<&str>>;
+
+    /// Return the kind of this section.
+    fn kind(&self) -> SectionKind;
+
+    /// Get the relocations for this section.
+    fn relocations(&self) -> Self::RelocationIterator;
+
+    /// Section flags that are specific to each file format.
+    fn flags(&self) -> SectionFlags;
+}
+
+/// A COMDAT section group in an [`Object`].
+///
+/// This trait is part of the unified read API.
+pub trait ObjectComdat<'data>: read::private::Sealed {
+    /// An iterator for the sections in the section group.
+    type SectionIterator: Iterator<Item = SectionIndex>;
+
+    /// Returns the COMDAT selection kind.
+    fn kind(&self) -> ComdatKind;
+
+    /// Returns the index of the symbol used for the name of COMDAT section group.
+    fn symbol(&self) -> SymbolIndex;
+
+    /// Returns the name of the COMDAT section group.
+    fn name_bytes(&self) -> Result<&[u8]>;
+
+    /// Returns the name of the COMDAT section group.
+    ///
+    /// Returns an error if the name is not UTF-8.
+    fn name(&self) -> Result<&str>;
+
+    /// Get the sections in this section group.
+    fn sections(&self) -> Self::SectionIterator;
+}
+
+/// A symbol table in an [`Object`].
+///
+/// This trait is part of the unified read API.
+pub trait ObjectSymbolTable<'data>: read::private::Sealed {
+    /// A symbol table entry.
+    type Symbol: ObjectSymbol<'data>;
+
+    /// An iterator for the symbols in a symbol table.
+    type SymbolIterator: Iterator<Item = Self::Symbol>;
+
+    /// Get an iterator for the symbols in the table.
+    ///
+    /// This may skip over symbols that are malformed or unsupported.
+    fn symbols(&self) -> Self::SymbolIterator;
+
+    /// Get the symbol at the given index.
+    ///
+    /// The meaning of the index depends on the object file.
+    ///
+    /// Returns an error if the index is invalid.
+    fn symbol_by_index(&self, index: SymbolIndex) -> Result<Self::Symbol>;
+}
+
+/// A symbol table entry in an [`Object`].
+///
+/// This trait is part of the unified read API.
+pub trait ObjectSymbol<'data>: read::private::Sealed {
+    /// The index of the symbol.
+    fn index(&self) -> SymbolIndex;
+
+    /// The name of the symbol.
+    fn name_bytes(&self) -> Result<&'data [u8]>;
+
+    /// The name of the symbol.
+    ///
+    /// Returns an error if the name is not UTF-8.
+    fn name(&self) -> Result<&'data str>;
+
+    /// The address of the symbol. May be zero if the address is unknown.
+    fn address(&self) -> u64;
+
+    /// The size of the symbol. May be zero if the size is unknown.
+    fn size(&self) -> u64;
+
+    /// Return the kind of this symbol.
+    fn kind(&self) -> SymbolKind;
+
+    /// Returns the section where the symbol is defined.
+    fn section(&self) -> SymbolSection;
+
+    /// Returns the section index for the section containing this symbol.
+    ///
+    /// May return `None` if the symbol is not defined in a section.
+    fn section_index(&self) -> Option<SectionIndex> {
+        self.section().index()
+    }
+
+    /// Return true if the symbol is undefined.
+    fn is_undefined(&self) -> bool;
+
+    /// Return true if the symbol is a definition of a function or data object
+    /// that has a known address.
+    ///
+    /// This is primarily used to implement [`Object::symbol_map`].
+    fn is_definition(&self) -> bool;
+
+    /// Return true if the symbol is common data.
+    ///
+    /// Note: does not check for [`SymbolSection::Section`] with [`SectionKind::Common`].
+    fn is_common(&self) -> bool;
+
+    /// Return true if the symbol is weak.
+    fn is_weak(&self) -> bool;
+
+    /// Returns the symbol scope.
+    fn scope(&self) -> SymbolScope;
+
+    /// Return true if the symbol visible outside of the compilation unit.
+    ///
+    /// This treats [`SymbolScope::Unknown`] as global.
+    fn is_global(&self) -> bool;
+
+    /// Return true if the symbol is only visible within the compilation unit.
+    fn is_local(&self) -> bool;
+
+    /// Symbol flags that are specific to each file format.
+    fn flags(&self) -> SymbolFlags<SectionIndex, SymbolIndex>;
+}
+
+/// An iterator for files that don't have dynamic relocations.
+#[derive(Debug)]
+pub struct NoDynamicRelocationIterator;
+
+impl Iterator for NoDynamicRelocationIterator {
+    type Item = (u64, Relocation);
+
+    #[inline]
+    fn next(&mut self) -> Option<Self::Item> {
+        None
+    }
+}

vendor/object/src/read/util.rs

@@ -0,0 +1,425 @@
+use alloc::string::String;
+use core::convert::TryInto;
+use core::fmt;
+use core::marker::PhantomData;
+
+use crate::pod::{from_bytes, slice_from_bytes, Pod};
+use crate::ReadRef;
+
+/// A newtype for byte slices.
+///
+/// It has these important features:
+/// - no methods that can panic, such as `Index`
+/// - convenience methods for `Pod` types
+/// - a useful `Debug` implementation
+#[derive(Default, Clone, Copy, PartialEq, Eq)]
+pub struct Bytes<'data>(pub &'data [u8]);
+
+impl<'data> fmt::Debug for Bytes<'data> {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        debug_list_bytes(self.0, fmt)
+    }
+}
+
+impl<'data> Bytes<'data> {
+    /// Return the length of the byte slice.
+    #[inline]
+    pub fn len(&self) -> usize {
+        self.0.len()
+    }
+
+    /// Return true if the byte slice is empty.
+    #[inline]
+    pub fn is_empty(&self) -> bool {
+        self.0.is_empty()
+    }
+
+    /// Skip over the given number of bytes at the start of the byte slice.
+    ///
+    /// Modifies the byte slice to start after the bytes.
+    ///
+    /// Returns an error if there are too few bytes.
+    #[inline]
+    pub fn skip(&mut self, offset: usize) -> Result<(), ()> {
+        match self.0.get(offset..) {
+            Some(tail) => {
+                self.0 = tail;
+                Ok(())
+            }
+            None => {
+                self.0 = &[];
+                Err(())
+            }
+        }
+    }
+
+    /// Return a reference to the given number of bytes at the start of the byte slice.
+    ///
+    /// Modifies the byte slice to start after the bytes.
+    ///
+    /// Returns an error if there are too few bytes.
+    #[inline]
+    pub fn read_bytes(&mut self, count: usize) -> Result<Bytes<'data>, ()> {
+        match (self.0.get(..count), self.0.get(count..)) {
+            (Some(head), Some(tail)) => {
+                self.0 = tail;
+                Ok(Bytes(head))
+            }
+            _ => {
+                self.0 = &[];
+                Err(())
+            }
+        }
+    }
+
+    /// Return a reference to the given number of bytes at the given offset of the byte slice.
+    ///
+    /// Returns an error if the offset is invalid or there are too few bytes.
+    #[inline]
+    pub fn read_bytes_at(mut self, offset: usize, count: usize) -> Result<Bytes<'data>, ()> {
+        self.skip(offset)?;
+        self.read_bytes(count)
+    }
+
+    /// Return a reference to a `Pod` struct at the start of the byte slice.
+    ///
+    /// Modifies the byte slice to start after the bytes.
+    ///
+    /// Returns an error if there are too few bytes or the slice is incorrectly aligned.
+    #[inline]
+    pub fn read<T: Pod>(&mut self) -> Result<&'data T, ()> {
+        match from_bytes(self.0) {
+            Ok((value, tail)) => {
+                self.0 = tail;
+                Ok(value)
+            }
+            Err(()) => {
+                self.0 = &[];
+                Err(())
+            }
+        }
+    }
+
+    /// Return a reference to a `Pod` struct at the given offset of the byte slice.
+    ///
+    /// Returns an error if there are too few bytes or the offset is incorrectly aligned.
+    #[inline]
+    pub fn read_at<T: Pod>(mut self, offset: usize) -> Result<&'data T, ()> {
+        self.skip(offset)?;
+        self.read()
+    }
+
+    /// Return a reference to a slice of `Pod` structs at the start of the byte slice.
+    ///
+    /// Modifies the byte slice to start after the bytes.
+    ///
+    /// Returns an error if there are too few bytes or the offset is incorrectly aligned.
+    #[inline]
+    pub fn read_slice<T: Pod>(&mut self, count: usize) -> Result<&'data [T], ()> {
+        match slice_from_bytes(self.0, count) {
+            Ok((value, tail)) => {
+                self.0 = tail;
+                Ok(value)
+            }
+            Err(()) => {
+                self.0 = &[];
+                Err(())
+            }
+        }
+    }
+
+    /// Return a reference to a slice of `Pod` structs at the given offset of the byte slice.
+    ///
+    /// Returns an error if there are too few bytes or the offset is incorrectly aligned.
+    #[inline]
+    pub fn read_slice_at<T: Pod>(mut self, offset: usize, count: usize) -> Result<&'data [T], ()> {
+        self.skip(offset)?;
+        self.read_slice(count)
+    }
+
+    /// Read a null terminated string.
+    ///
+    /// Does not assume any encoding.
+    /// Reads past the null byte, but doesn't return it.
+    #[inline]
+    pub fn read_string(&mut self) -> Result<&'data [u8], ()> {
+        match memchr::memchr(b'\0', self.0) {
+            Some(null) => {
+                // These will never fail.
+                let bytes = self.read_bytes(null)?;
+                self.skip(1)?;
+                Ok(bytes.0)
+            }
+            None => {
+                self.0 = &[];
+                Err(())
+            }
+        }
+    }
+
+    /// Read a null terminated string at an offset.
+    ///
+    /// Does not assume any encoding. Does not return the null byte.
+    #[inline]
+    pub fn read_string_at(mut self, offset: usize) -> Result<&'data [u8], ()> {
+        self.skip(offset)?;
+        self.read_string()
+    }
+
+    /// Read an unsigned LEB128 number.
+    pub fn read_uleb128(&mut self) -> Result<u64, ()> {
+        let mut result = 0;
+        let mut shift = 0;
+
+        loop {
+            let byte = *self.read::<u8>()?;
+            if shift == 63 && byte != 0x00 && byte != 0x01 {
+                return Err(());
+            }
+            result |= u64::from(byte & 0x7f) << shift;
+            shift += 7;
+
+            if byte & 0x80 == 0 {
+                return Ok(result);
+            }
+        }
+    }
+
+    /// Read a signed LEB128 number.
+    pub fn read_sleb128(&mut self) -> Result<i64, ()> {
+        let mut result = 0;
+        let mut shift = 0;
+
+        loop {
+            let byte = *self.read::<u8>()?;
+            if shift == 63 && byte != 0x00 && byte != 0x7f {
+                return Err(());
+            }
+            result |= i64::from(byte & 0x7f) << shift;
+            shift += 7;
+
+            if byte & 0x80 == 0 {
+                if shift < 64 && (byte & 0x40) != 0 {
+                    // Sign extend the result.
+                    result |= !0 << shift;
+                }
+                return Ok(result);
+            }
+        }
+    }
+}
+
+// Only for Debug impl of `Bytes`.
+fn debug_list_bytes(bytes: &[u8], fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+    let mut list = fmt.debug_list();
+    list.entries(bytes.iter().take(8).copied().map(DebugByte));
+    if bytes.len() > 8 {
+        list.entry(&DebugLen(bytes.len()));
+    }
+    list.finish()
+}
+
+struct DebugByte(u8);
+
+impl fmt::Debug for DebugByte {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(fmt, "0x{:02x}", self.0)
+    }
+}
+
+struct DebugLen(usize);
+
+impl fmt::Debug for DebugLen {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(fmt, "...; {}", self.0)
+    }
+}
+
+/// A newtype for byte strings.
+///
+/// For byte slices that are strings of an unknown encoding.
+///
+/// Provides a `Debug` implementation that interprets the bytes as UTF-8.
+#[derive(Default, Clone, Copy, PartialEq, Eq)]
+pub(crate) struct ByteString<'data>(pub &'data [u8]);
+
+impl<'data> fmt::Debug for ByteString<'data> {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(fmt, "\"{}\"", String::from_utf8_lossy(self.0))
+    }
+}
+
+#[allow(dead_code)]
+#[inline]
+pub(crate) fn align(offset: usize, size: usize) -> usize {
+    (offset + (size - 1)) & !(size - 1)
+}
+
+#[allow(dead_code)]
+pub(crate) fn data_range(
+    data: &[u8],
+    data_address: u64,
+    range_address: u64,
+    size: u64,
+) -> Option<&[u8]> {
+    let offset = range_address.checked_sub(data_address)?;
+    data.get(offset.try_into().ok()?..)?
+        .get(..size.try_into().ok()?)
+}
+
+/// A table of zero-terminated strings.
+///
+/// This is used by most file formats for strings such as section names and symbol names.
+#[derive(Debug, Clone, Copy)]
+pub struct StringTable<'data, R = &'data [u8]>
+where
+    R: ReadRef<'data>,
+{
+    data: Option<R>,
+    start: u64,
+    end: u64,
+    marker: PhantomData<&'data ()>,
+}
+
+impl<'data, R: ReadRef<'data>> StringTable<'data, R> {
+    /// Interpret the given data as a string table.
+    pub fn new(data: R, start: u64, end: u64) -> Self {
+        StringTable {
+            data: Some(data),
+            start,
+            end,
+            marker: PhantomData,
+        }
+    }
+
+    /// Return the string at the given offset.
+    pub fn get(&self, offset: u32) -> Result<&'data [u8], ()> {
+        match self.data {
+            Some(data) => {
+                let r_start = self.start.checked_add(offset.into()).ok_or(())?;
+                data.read_bytes_at_until(r_start..self.end, 0)
+            }
+            None => Err(()),
+        }
+    }
+}
+
+impl<'data, R: ReadRef<'data>> Default for StringTable<'data, R> {
+    fn default() -> Self {
+        StringTable {
+            data: None,
+            start: 0,
+            end: 0,
+            marker: PhantomData,
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::pod::bytes_of;
+
+    #[test]
+    fn bytes() {
+        let x = u32::to_be(0x0123_4567);
+        let data = Bytes(bytes_of(&x));
+
+        let mut bytes = data;
+        assert_eq!(bytes.skip(0), Ok(()));
+        assert_eq!(bytes, data);
+
+        let mut bytes = data;
+        assert_eq!(bytes.skip(4), Ok(()));
+        assert_eq!(bytes, Bytes(&[]));
+
+        let mut bytes = data;
+        assert_eq!(bytes.skip(5), Err(()));
+        assert_eq!(bytes, Bytes(&[]));
+
+        let mut bytes = data;
+        assert_eq!(bytes.read_bytes(0), Ok(Bytes(&[])));
+        assert_eq!(bytes, data);
+
+        let mut bytes = data;
+        assert_eq!(bytes.read_bytes(4), Ok(data));
+        assert_eq!(bytes, Bytes(&[]));
+
+        let mut bytes = data;
+        assert_eq!(bytes.read_bytes(5), Err(()));
+        assert_eq!(bytes, Bytes(&[]));
+
+        assert_eq!(data.read_bytes_at(0, 0), Ok(Bytes(&[])));
+        assert_eq!(data.read_bytes_at(4, 0), Ok(Bytes(&[])));
+        assert_eq!(data.read_bytes_at(0, 4), Ok(data));
+        assert_eq!(data.read_bytes_at(1, 4), Err(()));
+
+        let mut bytes = data;
+        assert_eq!(bytes.read::<u16>(), Ok(&u16::to_be(0x0123)));
+        assert_eq!(bytes, Bytes(&[0x45, 0x67]));
+        assert_eq!(data.read_at::<u16>(2), Ok(&u16::to_be(0x4567)));
+        assert_eq!(data.read_at::<u16>(3), Err(()));
+        assert_eq!(data.read_at::<u16>(4), Err(()));
+
+        let mut bytes = data;
+        assert_eq!(bytes.read::<u32>(), Ok(&x));
+        assert_eq!(bytes, Bytes(&[]));
+
+        let mut bytes = data;
+        assert_eq!(bytes.read::<u64>(), Err(()));
+        assert_eq!(bytes, Bytes(&[]));
+
+        let mut bytes = data;
+        assert_eq!(bytes.read_slice::<u8>(0), Ok(&[][..]));
+        assert_eq!(bytes, data);
+
+        let mut bytes = data;
+        assert_eq!(bytes.read_slice::<u8>(4), Ok(data.0));
+        assert_eq!(bytes, Bytes(&[]));
+
+        let mut bytes = data;
+        assert_eq!(bytes.read_slice::<u8>(5), Err(()));
+        assert_eq!(bytes, Bytes(&[]));
+
+        assert_eq!(data.read_slice_at::<u8>(0, 0), Ok(&[][..]));
+        assert_eq!(data.read_slice_at::<u8>(4, 0), Ok(&[][..]));
+        assert_eq!(data.read_slice_at::<u8>(0, 4), Ok(data.0));
+        assert_eq!(data.read_slice_at::<u8>(1, 4), Err(()));
+
+        let data = Bytes(&[0x01, 0x02, 0x00, 0x04]);
+
+        let mut bytes = data;
+        assert_eq!(bytes.read_string(), Ok(&data.0[..2]));
+        assert_eq!(bytes.0, &data.0[3..]);
+
+        let mut bytes = data;
+        bytes.skip(3).unwrap();
+        assert_eq!(bytes.read_string(), Err(()));
+        assert_eq!(bytes.0, &[]);
+
+        assert_eq!(data.read_string_at(0), Ok(&data.0[..2]));
+        assert_eq!(data.read_string_at(1), Ok(&data.0[1..2]));
+        assert_eq!(data.read_string_at(2), Ok(&[][..]));
+        assert_eq!(data.read_string_at(3), Err(()));
+    }
+
+    #[test]
+    fn bytes_debug() {
+        assert_eq!(format!("{:?}", Bytes(&[])), "[]");
+        assert_eq!(format!("{:?}", Bytes(&[0x01])), "[0x01]");
+        assert_eq!(
+            format!(
+                "{:?}",
+                Bytes(&[0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08])
+            ),
+            "[0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08]"
+        );
+        assert_eq!(
+            format!(
+                "{:?}",
+                Bytes(&[0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09])
+            ),
+            "[0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, ...; 9]"
+        );
+    }
+}

vendor/object/src/read/wasm.rs

@@ -0,0 +1,966 @@
+//! Support for reading Wasm files.
+//!
+//! [`WasmFile`] implements the [`Object`] trait for Wasm files.
+use alloc::boxed::Box;
+use alloc::vec::Vec;
+use core::marker::PhantomData;
+use core::ops::Range;
+use core::{slice, str};
+use wasmparser as wp;
+
+use crate::read::{
+    self, Architecture, ComdatKind, CompressedData, CompressedFileRange, Error, Export, FileFlags,
+    Import, NoDynamicRelocationIterator, Object, ObjectComdat, ObjectKind, ObjectSection,
+    ObjectSegment, ObjectSymbol, ObjectSymbolTable, ReadError, ReadRef, Relocation, Result,
+    SectionFlags, SectionIndex, SectionKind, SegmentFlags, SymbolFlags, SymbolIndex, SymbolKind,
+    SymbolScope, SymbolSection,
+};
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[repr(usize)]
+enum SectionId {
+    Custom = 0,
+    Type = 1,
+    Import = 2,
+    Function = 3,
+    Table = 4,
+    Memory = 5,
+    Global = 6,
+    Export = 7,
+    Start = 8,
+    Element = 9,
+    Code = 10,
+    Data = 11,
+    DataCount = 12,
+}
+// Update this constant when adding new section id:
+const MAX_SECTION_ID: usize = SectionId::DataCount as usize;
+
+/// A WebAssembly object file.
+#[derive(Debug)]
+pub struct WasmFile<'data, R = &'data [u8]> {
+    data: &'data [u8],
+    has_memory64: bool,
+    // All sections, including custom sections.
+    sections: Vec<SectionHeader<'data>>,
+    // Indices into `sections` of sections with a non-zero id.
+    id_sections: Box<[Option<usize>; MAX_SECTION_ID + 1]>,
+    // Whether the file has DWARF information.
+    has_debug_symbols: bool,
+    // Symbols collected from imports, exports, code and name sections.
+    symbols: Vec<WasmSymbolInternal<'data>>,
+    // Address of the function body for the entry point.
+    entry: u64,
+    marker: PhantomData<R>,
+}
+
+#[derive(Debug)]
+struct SectionHeader<'data> {
+    id: SectionId,
+    range: Range<usize>,
+    name: &'data str,
+}
+
+#[derive(Clone)]
+enum LocalFunctionKind {
+    Unknown,
+    Exported { symbol_ids: Vec<u32> },
+    Local { symbol_id: u32 },
+}
+
+impl<T> ReadError<T> for wasmparser::Result<T> {
+    fn read_error(self, error: &'static str) -> Result<T> {
+        self.map_err(|_| Error(error))
+    }
+}
+
+impl<'data, R: ReadRef<'data>> WasmFile<'data, R> {
+    /// Parse the raw wasm data.
+    pub fn parse(data: R) -> Result<Self> {
+        let len = data.len().read_error("Unknown Wasm file size")?;
+        let data = data.read_bytes_at(0, len).read_error("Wasm read failed")?;
+        let parser = wp::Parser::new(0).parse_all(data);
+
+        let mut file = WasmFile {
+            data,
+            has_memory64: false,
+            sections: Vec::new(),
+            id_sections: Default::default(),
+            has_debug_symbols: false,
+            symbols: Vec::new(),
+            entry: 0,
+            marker: PhantomData,
+        };
+
+        let mut main_file_symbol = Some(WasmSymbolInternal {
+            name: "",
+            address: 0,
+            size: 0,
+            kind: SymbolKind::File,
+            section: SymbolSection::None,
+            scope: SymbolScope::Compilation,
+        });
+
+        let mut imported_funcs_count = 0;
+        let mut local_func_kinds = Vec::new();
+        let mut entry_func_id = None;
+        let mut code_range_start = 0;
+        let mut code_func_index = 0;
+        // One-to-one mapping of globals to their value (if the global is a constant integer).
+        let mut global_values = Vec::new();
+
+        for payload in parser {
+            let payload = payload.read_error("Invalid Wasm section header")?;
+
+            match payload {
+                wp::Payload::TypeSection(section) => {
+                    file.add_section(SectionId::Type, section.range(), "");
+                }
+                wp::Payload::ImportSection(section) => {
+                    file.add_section(SectionId::Import, section.range(), "");
+                    let mut last_module_name = None;
+
+                    for import in section {
+                        let import = import.read_error("Couldn't read an import item")?;
+                        let module_name = import.module;
+
+                        if last_module_name != Some(module_name) {
+                            file.symbols.push(WasmSymbolInternal {
+                                name: module_name,
+                                address: 0,
+                                size: 0,
+                                kind: SymbolKind::File,
+                                section: SymbolSection::None,
+                                scope: SymbolScope::Dynamic,
+                            });
+                            last_module_name = Some(module_name);
+                        }
+
+                        let kind = match import.ty {
+                            wp::TypeRef::Func(_) => {
+                                imported_funcs_count += 1;
+                                SymbolKind::Text
+                            }
+                            wp::TypeRef::Memory(memory) => {
+                                file.has_memory64 |= memory.memory64;
+                                SymbolKind::Data
+                            }
+                            wp::TypeRef::Table(_) | wp::TypeRef::Global(_) => SymbolKind::Data,
+                            wp::TypeRef::Tag(_) => SymbolKind::Unknown,
+                        };
+
+                        file.symbols.push(WasmSymbolInternal {
+                            name: import.name,
+                            address: 0,
+                            size: 0,
+                            kind,
+                            section: SymbolSection::Undefined,
+                            scope: SymbolScope::Dynamic,
+                        });
+                    }
+                }
+                wp::Payload::FunctionSection(section) => {
+                    file.add_section(SectionId::Function, section.range(), "");
+                    local_func_kinds =
+                        vec![LocalFunctionKind::Unknown; section.into_iter().count()];
+                }
+                wp::Payload::TableSection(section) => {
+                    file.add_section(SectionId::Table, section.range(), "");
+                }
+                wp::Payload::MemorySection(section) => {
+                    file.add_section(SectionId::Memory, section.range(), "");
+                    for memory in section {
+                        let memory = memory.read_error("Couldn't read a memory item")?;
+                        file.has_memory64 |= memory.memory64;
+                    }
+                }
+                wp::Payload::GlobalSection(section) => {
+                    file.add_section(SectionId::Global, section.range(), "");
+                    for global in section {
+                        let global = global.read_error("Couldn't read a global item")?;
+                        let mut address = None;
+                        if !global.ty.mutable {
+                            // There should be exactly one instruction.
+                            let init = global.init_expr.get_operators_reader().read();
+                            address = match init.read_error("Couldn't read a global init expr")? {
+                                wp::Operator::I32Const { value } => Some(value as u64),
+                                wp::Operator::I64Const { value } => Some(value as u64),
+                                _ => None,
+                            };
+                        }
+                        global_values.push(address);
+                    }
+                }
+                wp::Payload::ExportSection(section) => {
+                    file.add_section(SectionId::Export, section.range(), "");
+                    if let Some(main_file_symbol) = main_file_symbol.take() {
+                        file.symbols.push(main_file_symbol);
+                    }
+
+                    for export in section {
+                        let export = export.read_error("Couldn't read an export item")?;
+
+                        let (kind, section_idx) = match export.kind {
+                            wp::ExternalKind::Func => {
+                                if let Some(local_func_id) =
+                                    export.index.checked_sub(imported_funcs_count)
+                                {
+                                    let local_func_kind =
+                                        &mut local_func_kinds[local_func_id as usize];
+                                    if let LocalFunctionKind::Unknown = local_func_kind {
+                                        *local_func_kind = LocalFunctionKind::Exported {
+                                            symbol_ids: Vec::new(),
+                                        };
+                                    }
+                                    let symbol_ids = match local_func_kind {
+                                        LocalFunctionKind::Exported { symbol_ids } => symbol_ids,
+                                        _ => unreachable!(),
+                                    };
+                                    symbol_ids.push(file.symbols.len() as u32);
+                                }
+                                (SymbolKind::Text, SectionId::Code)
+                            }
+                            wp::ExternalKind::Table
+                            | wp::ExternalKind::Memory
+                            | wp::ExternalKind::Global => (SymbolKind::Data, SectionId::Data),
+                            // TODO
+                            wp::ExternalKind::Tag => continue,
+                        };
+
+                        // Try to guess the symbol address. Rust and C export a global containing
+                        // the address in linear memory of the symbol.
+                        let mut address = 0;
+                        if export.kind == wp::ExternalKind::Global {
+                            if let Some(&Some(x)) = global_values.get(export.index as usize) {
+                                address = x;
+                            }
+                        }
+
+                        file.symbols.push(WasmSymbolInternal {
+                            name: export.name,
+                            address,
+                            size: 0,
+                            kind,
+                            section: SymbolSection::Section(SectionIndex(section_idx as usize)),
+                            scope: SymbolScope::Dynamic,
+                        });
+                    }
+                }
+                wp::Payload::StartSection { func, range, .. } => {
+                    file.add_section(SectionId::Start, range, "");
+                    entry_func_id = Some(func);
+                }
+                wp::Payload::ElementSection(section) => {
+                    file.add_section(SectionId::Element, section.range(), "");
+                }
+                wp::Payload::CodeSectionStart { range, .. } => {
+                    code_range_start = range.start;
+                    file.add_section(SectionId::Code, range, "");
+                    if let Some(main_file_symbol) = main_file_symbol.take() {
+                        file.symbols.push(main_file_symbol);
+                    }
+                }
+                wp::Payload::CodeSectionEntry(body) => {
+                    let i = code_func_index;
+                    code_func_index += 1;
+
+                    let range = body.range();
+
+                    let address = range.start as u64 - code_range_start as u64;
+                    let size = (range.end - range.start) as u64;
+
+                    if entry_func_id == Some(i as u32) {
+                        file.entry = address;
+                    }
+
+                    let local_func_kind = &mut local_func_kinds[i];
+                    match local_func_kind {
+                        LocalFunctionKind::Unknown => {
+                            *local_func_kind = LocalFunctionKind::Local {
+                                symbol_id: file.symbols.len() as u32,
+                            };
+                            file.symbols.push(WasmSymbolInternal {
+                                name: "",
+                                address,
+                                size,
+                                kind: SymbolKind::Text,
+                                section: SymbolSection::Section(SectionIndex(
+                                    SectionId::Code as usize,
+                                )),
+                                scope: SymbolScope::Compilation,
+                            });
+                        }
+                        LocalFunctionKind::Exported { symbol_ids } => {
+                            for symbol_id in core::mem::take(symbol_ids) {
+                                let export_symbol = &mut file.symbols[symbol_id as usize];
+                                export_symbol.address = address;
+                                export_symbol.size = size;
+                            }
+                        }
+                        _ => unreachable!(),
+                    }
+                }
+                wp::Payload::DataSection(section) => {
+                    file.add_section(SectionId::Data, section.range(), "");
+                }
+                wp::Payload::DataCountSection { range, .. } => {
+                    file.add_section(SectionId::DataCount, range, "");
+                }
+                wp::Payload::CustomSection(section) => {
+                    let name = section.name();
+                    let size = section.data().len();
+                    let mut range = section.range();
+                    range.start = range.end - size;
+                    file.add_section(SectionId::Custom, range, name);
+                    if name == "name" {
+                        for name in
+                            wp::NameSectionReader::new(section.data(), section.data_offset())
+                        {
+                            // TODO: Right now, ill-formed name subsections
+                            // are silently ignored in order to maintain
+                            // compatibility with extended name sections, which
+                            // are not yet supported by the version of
+                            // `wasmparser` currently used.
+                            // A better fix would be to update `wasmparser` to
+                            // the newest version, but this requires
+                            // a major rewrite of this file.
+                            if let Ok(wp::Name::Function(name_map)) = name {
+                                for naming in name_map {
+                                    let naming =
+                                        naming.read_error("Couldn't read a function name")?;
+                                    if let Some(local_index) =
+                                        naming.index.checked_sub(imported_funcs_count)
+                                    {
+                                        if let LocalFunctionKind::Local { symbol_id } =
+                                            local_func_kinds[local_index as usize]
+                                        {
+                                            file.symbols[symbol_id as usize].name = naming.name;
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    } else if name.starts_with(".debug_") {
+                        file.has_debug_symbols = true;
+                    }
+                }
+                _ => {}
+            }
+        }
+
+        Ok(file)
+    }
+
+    fn add_section(&mut self, id: SectionId, range: Range<usize>, name: &'data str) {
+        let section = SectionHeader { id, range, name };
+        self.id_sections[id as usize] = Some(self.sections.len());
+        self.sections.push(section);
+    }
+}
+
+impl<'data, R> read::private::Sealed for WasmFile<'data, R> {}
+
+impl<'data, 'file, R: ReadRef<'data>> Object<'data, 'file> for WasmFile<'data, R>
+where
+    'data: 'file,
+    R: 'file,
+{
+    type Segment = WasmSegment<'data, 'file, R>;
+    type SegmentIterator = WasmSegmentIterator<'data, 'file, R>;
+    type Section = WasmSection<'data, 'file, R>;
+    type SectionIterator = WasmSectionIterator<'data, 'file, R>;
+    type Comdat = WasmComdat<'data, 'file, R>;
+    type ComdatIterator = WasmComdatIterator<'data, 'file, R>;
+    type Symbol = WasmSymbol<'data, 'file>;
+    type SymbolIterator = WasmSymbolIterator<'data, 'file>;
+    type SymbolTable = WasmSymbolTable<'data, 'file>;
+    type DynamicRelocationIterator = NoDynamicRelocationIterator;
+
+    #[inline]
+    fn architecture(&self) -> Architecture {
+        if self.has_memory64 {
+            Architecture::Wasm64
+        } else {
+            Architecture::Wasm32
+        }
+    }
+
+    #[inline]
+    fn is_little_endian(&self) -> bool {
+        true
+    }
+
+    #[inline]
+    fn is_64(&self) -> bool {
+        self.has_memory64
+    }
+
+    fn kind(&self) -> ObjectKind {
+        // TODO: check for `linking` custom section
+        ObjectKind::Unknown
+    }
+
+    fn segments(&'file self) -> Self::SegmentIterator {
+        WasmSegmentIterator { file: self }
+    }
+
+    fn section_by_name_bytes(
+        &'file self,
+        section_name: &[u8],
+    ) -> Option<WasmSection<'data, 'file, R>> {
+        self.sections()
+            .find(|section| section.name_bytes() == Ok(section_name))
+    }
+
+    fn section_by_index(&'file self, index: SectionIndex) -> Result<WasmSection<'data, 'file, R>> {
+        // TODO: Missing sections should return an empty section.
+        let id_section = self
+            .id_sections
+            .get(index.0)
+            .and_then(|x| *x)
+            .read_error("Invalid Wasm section index")?;
+        let section = self.sections.get(id_section).unwrap();
+        Ok(WasmSection {
+            file: self,
+            section,
+        })
+    }
+
+    fn sections(&'file self) -> Self::SectionIterator {
+        WasmSectionIterator {
+            file: self,
+            sections: self.sections.iter(),
+        }
+    }
+
+    fn comdats(&'file self) -> Self::ComdatIterator {
+        WasmComdatIterator { file: self }
+    }
+
+    #[inline]
+    fn symbol_by_index(&'file self, index: SymbolIndex) -> Result<WasmSymbol<'data, 'file>> {
+        let symbol = self
+            .symbols
+            .get(index.0)
+            .read_error("Invalid Wasm symbol index")?;
+        Ok(WasmSymbol { index, symbol })
+    }
+
+    fn symbols(&'file self) -> Self::SymbolIterator {
+        WasmSymbolIterator {
+            symbols: self.symbols.iter().enumerate(),
+        }
+    }
+
+    fn symbol_table(&'file self) -> Option<WasmSymbolTable<'data, 'file>> {
+        Some(WasmSymbolTable {
+            symbols: &self.symbols,
+        })
+    }
+
+    fn dynamic_symbols(&'file self) -> Self::SymbolIterator {
+        WasmSymbolIterator {
+            symbols: [].iter().enumerate(),
+        }
+    }
+
+    #[inline]
+    fn dynamic_symbol_table(&'file self) -> Option<WasmSymbolTable<'data, 'file>> {
+        None
+    }
+
+    #[inline]
+    fn dynamic_relocations(&self) -> Option<NoDynamicRelocationIterator> {
+        None
+    }
+
+    fn imports(&self) -> Result<Vec<Import<'data>>> {
+        // TODO: return entries in the import section
+        Ok(Vec::new())
+    }
+
+    fn exports(&self) -> Result<Vec<Export<'data>>> {
+        // TODO: return entries in the export section
+        Ok(Vec::new())
+    }
+
+    fn has_debug_symbols(&self) -> bool {
+        self.has_debug_symbols
+    }
+
+    fn relative_address_base(&self) -> u64 {
+        0
+    }
+
+    #[inline]
+    fn entry(&'file self) -> u64 {
+        self.entry
+    }
+
+    #[inline]
+    fn flags(&self) -> FileFlags {
+        FileFlags::None
+    }
+}
+
+/// An iterator for the segments in a [`WasmFile`].
+///
+/// This is a stub that doesn't implement any functionality.
+#[derive(Debug)]
+pub struct WasmSegmentIterator<'data, 'file, R = &'data [u8]> {
+    #[allow(unused)]
+    file: &'file WasmFile<'data, R>,
+}
+
+impl<'data, 'file, R> Iterator for WasmSegmentIterator<'data, 'file, R> {
+    type Item = WasmSegment<'data, 'file, R>;
+
+    #[inline]
+    fn next(&mut self) -> Option<Self::Item> {
+        None
+    }
+}
+
+/// A segment in a [`WasmFile`].
+///
+/// This is a stub that doesn't implement any functionality.
+#[derive(Debug)]
+pub struct WasmSegment<'data, 'file, R = &'data [u8]> {
+    #[allow(unused)]
+    file: &'file WasmFile<'data, R>,
+}
+
+impl<'data, 'file, R> read::private::Sealed for WasmSegment<'data, 'file, R> {}
+
+impl<'data, 'file, R> ObjectSegment<'data> for WasmSegment<'data, 'file, R> {
+    #[inline]
+    fn address(&self) -> u64 {
+        unreachable!()
+    }
+
+    #[inline]
+    fn size(&self) -> u64 {
+        unreachable!()
+    }
+
+    #[inline]
+    fn align(&self) -> u64 {
+        unreachable!()
+    }
+
+    #[inline]
+    fn file_range(&self) -> (u64, u64) {
+        unreachable!()
+    }
+
+    fn data(&self) -> Result<&'data [u8]> {
+        unreachable!()
+    }
+
+    fn data_range(&self, _address: u64, _size: u64) -> Result<Option<&'data [u8]>> {
+        unreachable!()
+    }
+
+    #[inline]
+    fn name_bytes(&self) -> Result<Option<&[u8]>> {
+        unreachable!()
+    }
+
+    #[inline]
+    fn name(&self) -> Result<Option<&str>> {
+        unreachable!()
+    }
+
+    #[inline]
+    fn flags(&self) -> SegmentFlags {
+        unreachable!()
+    }
+}
+
+/// An iterator for the sections in a [`WasmFile`].
+#[derive(Debug)]
+pub struct WasmSectionIterator<'data, 'file, R = &'data [u8]> {
+    file: &'file WasmFile<'data, R>,
+    sections: slice::Iter<'file, SectionHeader<'data>>,
+}
+
+impl<'data, 'file, R> Iterator for WasmSectionIterator<'data, 'file, R> {
+    type Item = WasmSection<'data, 'file, R>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let section = self.sections.next()?;
+        Some(WasmSection {
+            file: self.file,
+            section,
+        })
+    }
+}
+
+/// A section in a [`WasmFile`].
+///
+/// Most functionality is provided by the [`ObjectSection`] trait implementation.
+#[derive(Debug)]
+pub struct WasmSection<'data, 'file, R = &'data [u8]> {
+    file: &'file WasmFile<'data, R>,
+    section: &'file SectionHeader<'data>,
+}
+
+impl<'data, 'file, R> read::private::Sealed for WasmSection<'data, 'file, R> {}
+
+impl<'data, 'file, R: ReadRef<'data>> ObjectSection<'data> for WasmSection<'data, 'file, R> {
+    type RelocationIterator = WasmRelocationIterator<'data, 'file, R>;
+
+    #[inline]
+    fn index(&self) -> SectionIndex {
+        // Note that we treat all custom sections as index 0.
+        // This is ok because they are never looked up by index.
+        SectionIndex(self.section.id as usize)
+    }
+
+    #[inline]
+    fn address(&self) -> u64 {
+        0
+    }
+
+    #[inline]
+    fn size(&self) -> u64 {
+        let range = &self.section.range;
+        (range.end - range.start) as u64
+    }
+
+    #[inline]
+    fn align(&self) -> u64 {
+        1
+    }
+
+    #[inline]
+    fn file_range(&self) -> Option<(u64, u64)> {
+        let range = &self.section.range;
+        Some((range.start as _, range.end as _))
+    }
+
+    #[inline]
+    fn data(&self) -> Result<&'data [u8]> {
+        let range = &self.section.range;
+        self.file
+            .data
+            .read_bytes_at(range.start as u64, range.end as u64 - range.start as u64)
+            .read_error("Invalid Wasm section size or offset")
+    }
+
+    fn data_range(&self, _address: u64, _size: u64) -> Result<Option<&'data [u8]>> {
+        unimplemented!()
+    }
+
+    #[inline]
+    fn compressed_file_range(&self) -> Result<CompressedFileRange> {
+        Ok(CompressedFileRange::none(self.file_range()))
+    }
+
+    #[inline]
+    fn compressed_data(&self) -> Result<CompressedData<'data>> {
+        self.data().map(CompressedData::none)
+    }
+
+    #[inline]
+    fn name_bytes(&self) -> Result<&[u8]> {
+        self.name().map(str::as_bytes)
+    }
+
+    #[inline]
+    fn name(&self) -> Result<&str> {
+        Ok(match self.section.id {
+            SectionId::Custom => self.section.name,
+            SectionId::Type => "<type>",
+            SectionId::Import => "<import>",
+            SectionId::Function => "<function>",
+            SectionId::Table => "<table>",
+            SectionId::Memory => "<memory>",
+            SectionId::Global => "<global>",
+            SectionId::Export => "<export>",
+            SectionId::Start => "<start>",
+            SectionId::Element => "<element>",
+            SectionId::Code => "<code>",
+            SectionId::Data => "<data>",
+            SectionId::DataCount => "<data_count>",
+        })
+    }
+
+    #[inline]
+    fn segment_name_bytes(&self) -> Result<Option<&[u8]>> {
+        Ok(None)
+    }
+
+    #[inline]
+    fn segment_name(&self) -> Result<Option<&str>> {
+        Ok(None)
+    }
+
+    #[inline]
+    fn kind(&self) -> SectionKind {
+        match self.section.id {
+            SectionId::Custom => match self.section.name {
+                "reloc." | "linking" => SectionKind::Linker,
+                _ => SectionKind::Other,
+            },
+            SectionId::Type => SectionKind::Metadata,
+            SectionId::Import => SectionKind::Linker,
+            SectionId::Function => SectionKind::Metadata,
+            SectionId::Table => SectionKind::UninitializedData,
+            SectionId::Memory => SectionKind::UninitializedData,
+            SectionId::Global => SectionKind::Data,
+            SectionId::Export => SectionKind::Linker,
+            SectionId::Start => SectionKind::Linker,
+            SectionId::Element => SectionKind::Data,
+            SectionId::Code => SectionKind::Text,
+            SectionId::Data => SectionKind::Data,
+            SectionId::DataCount => SectionKind::UninitializedData,
+        }
+    }
+
+    #[inline]
+    fn relocations(&self) -> WasmRelocationIterator<'data, 'file, R> {
+        WasmRelocationIterator(PhantomData)
+    }
+
+    #[inline]
+    fn flags(&self) -> SectionFlags {
+        SectionFlags::None
+    }
+}
+
+/// An iterator for the COMDAT section groups in a [`WasmFile`].
+///
+/// This is a stub that doesn't implement any functionality.
+#[derive(Debug)]
+pub struct WasmComdatIterator<'data, 'file, R = &'data [u8]> {
+    #[allow(unused)]
+    file: &'file WasmFile<'data, R>,
+}
+
+impl<'data, 'file, R> Iterator for WasmComdatIterator<'data, 'file, R> {
+    type Item = WasmComdat<'data, 'file, R>;
+
+    #[inline]
+    fn next(&mut self) -> Option<Self::Item> {
+        None
+    }
+}
+
+/// A COMDAT section group in a [`WasmFile`].
+///
+/// This is a stub that doesn't implement any functionality.
+#[derive(Debug)]
+pub struct WasmComdat<'data, 'file, R = &'data [u8]> {
+    #[allow(unused)]
+    file: &'file WasmFile<'data, R>,
+}
+
+impl<'data, 'file, R> read::private::Sealed for WasmComdat<'data, 'file, R> {}
+
+impl<'data, 'file, R> ObjectComdat<'data> for WasmComdat<'data, 'file, R> {
+    type SectionIterator = WasmComdatSectionIterator<'data, 'file, R>;
+
+    #[inline]
+    fn kind(&self) -> ComdatKind {
+        unreachable!();
+    }
+
+    #[inline]
+    fn symbol(&self) -> SymbolIndex {
+        unreachable!();
+    }
+
+    #[inline]
+    fn name_bytes(&self) -> Result<&[u8]> {
+        unreachable!();
+    }
+
+    #[inline]
+    fn name(&self) -> Result<&str> {
+        unreachable!();
+    }
+
+    #[inline]
+    fn sections(&self) -> Self::SectionIterator {
+        unreachable!();
+    }
+}
+
+/// An iterator for the sections in a COMDAT section group in a [`WasmFile`].
+///
+/// This is a stub that doesn't implement any functionality.
+#[derive(Debug)]
+pub struct WasmComdatSectionIterator<'data, 'file, R = &'data [u8]> {
+    #[allow(unused)]
+    file: &'file WasmFile<'data, R>,
+}
+
+impl<'data, 'file, R> Iterator for WasmComdatSectionIterator<'data, 'file, R> {
+    type Item = SectionIndex;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        None
+    }
+}
+
+/// A symbol table in a [`WasmFile`].
+#[derive(Debug)]
+pub struct WasmSymbolTable<'data, 'file> {
+    symbols: &'file [WasmSymbolInternal<'data>],
+}
+
+impl<'data, 'file> read::private::Sealed for WasmSymbolTable<'data, 'file> {}
+
+impl<'data, 'file> ObjectSymbolTable<'data> for WasmSymbolTable<'data, 'file> {
+    type Symbol = WasmSymbol<'data, 'file>;
+    type SymbolIterator = WasmSymbolIterator<'data, 'file>;
+
+    fn symbols(&self) -> Self::SymbolIterator {
+        WasmSymbolIterator {
+            symbols: self.symbols.iter().enumerate(),
+        }
+    }
+
+    fn symbol_by_index(&self, index: SymbolIndex) -> Result<Self::Symbol> {
+        let symbol = self
+            .symbols
+            .get(index.0)
+            .read_error("Invalid Wasm symbol index")?;
+        Ok(WasmSymbol { index, symbol })
+    }
+}
+
+/// An iterator for the symbols in a [`WasmFile`].
+#[derive(Debug)]
+pub struct WasmSymbolIterator<'data, 'file> {
+    symbols: core::iter::Enumerate<slice::Iter<'file, WasmSymbolInternal<'data>>>,
+}
+
+impl<'data, 'file> Iterator for WasmSymbolIterator<'data, 'file> {
+    type Item = WasmSymbol<'data, 'file>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let (index, symbol) = self.symbols.next()?;
+        Some(WasmSymbol {
+            index: SymbolIndex(index),
+            symbol,
+        })
+    }
+}
+
+/// A symbol in a [`WasmFile`].
+///
+/// Most functionality is provided by the [`ObjectSymbol`] trait implementation.
+#[derive(Clone, Copy, Debug)]
+pub struct WasmSymbol<'data, 'file> {
+    index: SymbolIndex,
+    symbol: &'file WasmSymbolInternal<'data>,
+}
+
+#[derive(Clone, Debug)]
+struct WasmSymbolInternal<'data> {
+    name: &'data str,
+    address: u64,
+    size: u64,
+    kind: SymbolKind,
+    section: SymbolSection,
+    scope: SymbolScope,
+}
+
+impl<'data, 'file> read::private::Sealed for WasmSymbol<'data, 'file> {}
+
+impl<'data, 'file> ObjectSymbol<'data> for WasmSymbol<'data, 'file> {
+    #[inline]
+    fn index(&self) -> SymbolIndex {
+        self.index
+    }
+
+    #[inline]
+    fn name_bytes(&self) -> read::Result<&'data [u8]> {
+        Ok(self.symbol.name.as_bytes())
+    }
+
+    #[inline]
+    fn name(&self) -> read::Result<&'data str> {
+        Ok(self.symbol.name)
+    }
+
+    #[inline]
+    fn address(&self) -> u64 {
+        self.symbol.address
+    }
+
+    #[inline]
+    fn size(&self) -> u64 {
+        self.symbol.size
+    }
+
+    #[inline]
+    fn kind(&self) -> SymbolKind {
+        self.symbol.kind
+    }
+
+    #[inline]
+    fn section(&self) -> SymbolSection {
+        self.symbol.section
+    }
+
+    #[inline]
+    fn is_undefined(&self) -> bool {
+        self.symbol.section == SymbolSection::Undefined
+    }
+
+    #[inline]
+    fn is_definition(&self) -> bool {
+        (self.symbol.kind == SymbolKind::Text || self.symbol.kind == SymbolKind::Data)
+            && self.symbol.section != SymbolSection::Undefined
+    }
+
+    #[inline]
+    fn is_common(&self) -> bool {
+        self.symbol.section == SymbolSection::Common
+    }
+
+    #[inline]
+    fn is_weak(&self) -> bool {
+        false
+    }
+
+    #[inline]
+    fn scope(&self) -> SymbolScope {
+        self.symbol.scope
+    }
+
+    #[inline]
+    fn is_global(&self) -> bool {
+        self.symbol.scope != SymbolScope::Compilation
+    }
+
+    #[inline]
+    fn is_local(&self) -> bool {
+        self.symbol.scope == SymbolScope::Compilation
+    }
+
+    #[inline]
+    fn flags(&self) -> SymbolFlags<SectionIndex, SymbolIndex> {
+        SymbolFlags::None
+    }
+}
+
+/// An iterator for the relocations for a [`WasmSection`].
+///
+/// This is a stub that doesn't implement any functionality.
+#[derive(Debug)]
+pub struct WasmRelocationIterator<'data, 'file, R = &'data [u8]>(
+    PhantomData<(&'data (), &'file (), R)>,
+);
+
+impl<'data, 'file, R> Iterator for WasmRelocationIterator<'data, 'file, R> {
+    type Item = (u64, Relocation);
+
+    #[inline]
+    fn next(&mut self) -> Option<Self::Item> {
+        None
+    }
+}

vendor/object/src/read/xcoff/comdat.rs

@@ -0,0 +1,135 @@
+//! XCOFF doesn't support the COMDAT section.
+
+use core::fmt::Debug;
+
+use crate::xcoff;
+
+use crate::read::{self, ComdatKind, ObjectComdat, ReadRef, Result, SectionIndex, SymbolIndex};
+
+use super::{FileHeader, XcoffFile};
+
+/// An iterator for the COMDAT section groups in a [`XcoffFile32`](super::XcoffFile32).
+pub type XcoffComdatIterator32<'data, 'file, R = &'data [u8]> =
+    XcoffComdatIterator<'data, 'file, xcoff::FileHeader32, R>;
+/// An iterator for the COMDAT section groups in a [`XcoffFile64`](super::XcoffFile64).
+pub type XcoffComdatIterator64<'data, 'file, R = &'data [u8]> =
+    XcoffComdatIterator<'data, 'file, xcoff::FileHeader64, R>;
+
+/// An iterator for the COMDAT section groups in a [`XcoffFile`].
+///
+/// This is a stub that doesn't implement any functionality.
+#[derive(Debug)]
+pub struct XcoffComdatIterator<'data, 'file, Xcoff, R = &'data [u8]>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    #[allow(unused)]
+    pub(crate) file: &'file XcoffFile<'data, Xcoff, R>,
+}
+
+impl<'data, 'file, Xcoff, R> Iterator for XcoffComdatIterator<'data, 'file, Xcoff, R>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    type Item = XcoffComdat<'data, 'file, Xcoff, R>;
+
+    #[inline]
+    fn next(&mut self) -> Option<Self::Item> {
+        None
+    }
+}
+
+/// A COMDAT section group in a [`XcoffFile32`](super::XcoffFile32).
+pub type XcoffComdat32<'data, 'file, R = &'data [u8]> =
+    XcoffComdat<'data, 'file, xcoff::FileHeader32, R>;
+
+/// A COMDAT section group in a [`XcoffFile64`](super::XcoffFile64).
+pub type XcoffComdat64<'data, 'file, R = &'data [u8]> =
+    XcoffComdat<'data, 'file, xcoff::FileHeader64, R>;
+
+/// A COMDAT section group in a [`XcoffFile`].
+///
+/// This is a stub that doesn't implement any functionality.
+#[derive(Debug)]
+pub struct XcoffComdat<'data, 'file, Xcoff, R = &'data [u8]>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    #[allow(unused)]
+    file: &'file XcoffFile<'data, Xcoff, R>,
+}
+
+impl<'data, 'file, Xcoff, R> read::private::Sealed for XcoffComdat<'data, 'file, Xcoff, R>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+}
+
+impl<'data, 'file, Xcoff, R> ObjectComdat<'data> for XcoffComdat<'data, 'file, Xcoff, R>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    type SectionIterator = XcoffComdatSectionIterator<'data, 'file, Xcoff, R>;
+
+    #[inline]
+    fn kind(&self) -> ComdatKind {
+        unreachable!();
+    }
+
+    #[inline]
+    fn symbol(&self) -> SymbolIndex {
+        unreachable!();
+    }
+
+    #[inline]
+    fn name_bytes(&self) -> Result<&[u8]> {
+        unreachable!();
+    }
+
+    #[inline]
+    fn name(&self) -> Result<&str> {
+        unreachable!();
+    }
+
+    #[inline]
+    fn sections(&self) -> Self::SectionIterator {
+        unreachable!();
+    }
+}
+
+/// An iterator for the sections in a COMDAT section group in a [`XcoffFile32`](super::XcoffFile32).
+pub type XcoffComdatSectionIterator32<'data, 'file, R = &'data [u8]> =
+    XcoffComdatSectionIterator<'data, 'file, xcoff::FileHeader32, R>;
+/// An iterator for the sections in a COMDAT section group in a [`XcoffFile64`](super::XcoffFile64).
+pub type XcoffComdatSectionIterator64<'data, 'file, R = &'data [u8]> =
+    XcoffComdatSectionIterator<'data, 'file, xcoff::FileHeader64, R>;
+
+/// An iterator for the sections in a COMDAT section group in a [`XcoffFile`].
+///
+/// This is a stub that doesn't implement any functionality.
+#[derive(Debug)]
+pub struct XcoffComdatSectionIterator<'data, 'file, Xcoff, R = &'data [u8]>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    #[allow(unused)]
+    file: &'file XcoffFile<'data, Xcoff, R>,
+}
+
+impl<'data, 'file, Xcoff, R> Iterator for XcoffComdatSectionIterator<'data, 'file, Xcoff, R>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    type Item = SectionIndex;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        None
+    }
+}

vendor/object/src/read/xcoff/file.rs

@@ -0,0 +1,696 @@
+use core::fmt::Debug;
+use core::mem;
+
+use alloc::vec::Vec;
+
+use crate::read::{self, Error, NoDynamicRelocationIterator, Object, ReadError, ReadRef, Result};
+
+use crate::{
+    xcoff, Architecture, BigEndian as BE, FileFlags, ObjectKind, ObjectSection, Pod, SectionIndex,
+    SymbolIndex,
+};
+
+use super::{
+    CsectAux, FileAux, SectionHeader, SectionTable, Symbol, SymbolTable, XcoffComdat,
+    XcoffComdatIterator, XcoffSection, XcoffSectionIterator, XcoffSegment, XcoffSegmentIterator,
+    XcoffSymbol, XcoffSymbolIterator, XcoffSymbolTable,
+};
+
+/// A 32-bit XCOFF object file.
+///
+/// This is a file that starts with [`xcoff::FileHeader32`], and corresponds
+/// to [`crate::FileKind::Xcoff32`].
+pub type XcoffFile32<'data, R = &'data [u8]> = XcoffFile<'data, xcoff::FileHeader32, R>;
+/// A 64-bit XCOFF object file.
+///
+/// This is a file that starts with [`xcoff::FileHeader64`], and corresponds
+/// to [`crate::FileKind::Xcoff64`].
+pub type XcoffFile64<'data, R = &'data [u8]> = XcoffFile<'data, xcoff::FileHeader64, R>;
+
+/// A partially parsed XCOFF file.
+///
+/// Most functionality is provided by the [`Object`] trait implementation.
+#[derive(Debug)]
+pub struct XcoffFile<'data, Xcoff, R = &'data [u8]>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) data: R,
+    pub(super) header: &'data Xcoff,
+    pub(super) aux_header: Option<&'data Xcoff::AuxHeader>,
+    pub(super) sections: SectionTable<'data, Xcoff>,
+    pub(super) symbols: SymbolTable<'data, Xcoff, R>,
+}
+
+impl<'data, Xcoff, R> XcoffFile<'data, Xcoff, R>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    /// Parse the raw XCOFF file data.
+    pub fn parse(data: R) -> Result<Self> {
+        let mut offset = 0;
+        let header = Xcoff::parse(data, &mut offset)?;
+        let aux_header = header.aux_header(data, &mut offset)?;
+        let sections = header.sections(data, &mut offset)?;
+        let symbols = header.symbols(data)?;
+
+        Ok(XcoffFile {
+            data,
+            header,
+            aux_header,
+            sections,
+            symbols,
+        })
+    }
+
+    /// Returns the raw data.
+    pub fn data(&self) -> R {
+        self.data
+    }
+
+    /// Returns the raw XCOFF file header.
+    pub fn raw_header(&self) -> &'data Xcoff {
+        self.header
+    }
+}
+
+impl<'data, Xcoff, R> read::private::Sealed for XcoffFile<'data, Xcoff, R>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+}
+
+impl<'data, 'file, Xcoff, R> Object<'data, 'file> for XcoffFile<'data, Xcoff, R>
+where
+    'data: 'file,
+    Xcoff: FileHeader,
+    R: 'file + ReadRef<'data>,
+{
+    type Segment = XcoffSegment<'data, 'file, Xcoff, R>;
+    type SegmentIterator = XcoffSegmentIterator<'data, 'file, Xcoff, R>;
+    type Section = XcoffSection<'data, 'file, Xcoff, R>;
+    type SectionIterator = XcoffSectionIterator<'data, 'file, Xcoff, R>;
+    type Comdat = XcoffComdat<'data, 'file, Xcoff, R>;
+    type ComdatIterator = XcoffComdatIterator<'data, 'file, Xcoff, R>;
+    type Symbol = XcoffSymbol<'data, 'file, Xcoff, R>;
+    type SymbolIterator = XcoffSymbolIterator<'data, 'file, Xcoff, R>;
+    type SymbolTable = XcoffSymbolTable<'data, 'file, Xcoff, R>;
+    type DynamicRelocationIterator = NoDynamicRelocationIterator;
+
+    fn architecture(&self) -> crate::Architecture {
+        if self.is_64() {
+            Architecture::PowerPc64
+        } else {
+            Architecture::PowerPc
+        }
+    }
+
+    fn is_little_endian(&self) -> bool {
+        false
+    }
+
+    fn is_64(&self) -> bool {
+        self.header.is_type_64()
+    }
+
+    fn kind(&self) -> ObjectKind {
+        let flags = self.header.f_flags();
+        if flags & xcoff::F_EXEC != 0 {
+            ObjectKind::Executable
+        } else if flags & xcoff::F_SHROBJ != 0 {
+            ObjectKind::Dynamic
+        } else if flags & xcoff::F_RELFLG == 0 {
+            ObjectKind::Relocatable
+        } else {
+            ObjectKind::Unknown
+        }
+    }
+
+    fn segments(&'file self) -> XcoffSegmentIterator<'data, 'file, Xcoff, R> {
+        XcoffSegmentIterator { file: self }
+    }
+
+    fn section_by_name_bytes(
+        &'file self,
+        section_name: &[u8],
+    ) -> Option<XcoffSection<'data, 'file, Xcoff, R>> {
+        self.sections()
+            .find(|section| section.name_bytes() == Ok(section_name))
+    }
+
+    fn section_by_index(
+        &'file self,
+        index: SectionIndex,
+    ) -> Result<XcoffSection<'data, 'file, Xcoff, R>> {
+        let section = self.sections.section(index)?;
+        Ok(XcoffSection {
+            file: self,
+            section,
+            index,
+        })
+    }
+
+    fn sections(&'file self) -> XcoffSectionIterator<'data, 'file, Xcoff, R> {
+        XcoffSectionIterator {
+            file: self,
+            iter: self.sections.iter().enumerate(),
+        }
+    }
+
+    fn comdats(&'file self) -> XcoffComdatIterator<'data, 'file, Xcoff, R> {
+        XcoffComdatIterator { file: self }
+    }
+
+    fn symbol_table(&'file self) -> Option<XcoffSymbolTable<'data, 'file, Xcoff, R>> {
+        if self.symbols.is_empty() {
+            return None;
+        }
+        Some(XcoffSymbolTable {
+            symbols: &self.symbols,
+            file: self,
+        })
+    }
+
+    fn symbol_by_index(
+        &'file self,
+        index: SymbolIndex,
+    ) -> Result<XcoffSymbol<'data, 'file, Xcoff, R>> {
+        let symbol = self.symbols.symbol(index.0)?;
+        Ok(XcoffSymbol {
+            symbols: &self.symbols,
+            index,
+            symbol,
+            file: self,
+        })
+    }
+
+    fn symbols(&'file self) -> XcoffSymbolIterator<'data, 'file, Xcoff, R> {
+        XcoffSymbolIterator {
+            file: self,
+            symbols: self.symbols.iter(),
+        }
+    }
+
+    fn dynamic_symbol_table(&'file self) -> Option<XcoffSymbolTable<'data, 'file, Xcoff, R>> {
+        None
+    }
+
+    fn dynamic_symbols(&'file self) -> XcoffSymbolIterator<'data, 'file, Xcoff, R> {
+        // TODO: return the symbols in the STYP_LOADER section.
+        XcoffSymbolIterator {
+            file: self,
+            symbols: self.symbols.iter_none(),
+        }
+    }
+
+    fn dynamic_relocations(&'file self) -> Option<Self::DynamicRelocationIterator> {
+        // TODO: return the relocations in the STYP_LOADER section.
+        None
+    }
+
+    fn imports(&self) -> Result<alloc::vec::Vec<crate::Import<'data>>> {
+        // TODO: return the imports in the STYP_LOADER section.
+        Ok(Vec::new())
+    }
+
+    fn exports(&self) -> Result<alloc::vec::Vec<crate::Export<'data>>> {
+        // TODO: return the exports in the STYP_LOADER section.
+        Ok(Vec::new())
+    }
+
+    fn has_debug_symbols(&self) -> bool {
+        self.section_by_name(".debug").is_some() || self.section_by_name(".dwinfo").is_some()
+    }
+
+    fn relative_address_base(&'file self) -> u64 {
+        0
+    }
+
+    fn entry(&'file self) -> u64 {
+        if let Some(aux_header) = self.aux_header {
+            aux_header.o_entry().into()
+        } else {
+            0
+        }
+    }
+
+    fn flags(&self) -> FileFlags {
+        FileFlags::Xcoff {
+            f_flags: self.header.f_flags(),
+        }
+    }
+}
+
+/// A trait for generic access to [`xcoff::FileHeader32`] and [`xcoff::FileHeader64`].
+#[allow(missing_docs)]
+pub trait FileHeader: Debug + Pod {
+    type Word: Into<u64>;
+    type AuxHeader: AuxHeader<Word = Self::Word>;
+    type SectionHeader: SectionHeader<Word = Self::Word>;
+    type Symbol: Symbol<Word = Self::Word>;
+    type FileAux: FileAux;
+    type CsectAux: CsectAux;
+
+    /// Return true if this type is a 64-bit header.
+    fn is_type_64(&self) -> bool;
+
+    fn f_magic(&self) -> u16;
+    fn f_nscns(&self) -> u16;
+    fn f_timdat(&self) -> u32;
+    fn f_symptr(&self) -> Self::Word;
+    fn f_nsyms(&self) -> u32;
+    fn f_opthdr(&self) -> u16;
+    fn f_flags(&self) -> u16;
+
+    // Provided methods.
+
+    /// Read the file header.
+    ///
+    /// Also checks that the magic field in the file header is a supported format.
+    fn parse<'data, R: ReadRef<'data>>(data: R, offset: &mut u64) -> Result<&'data Self> {
+        let header = data
+            .read::<Self>(offset)
+            .read_error("Invalid XCOFF header size or alignment")?;
+        if !header.is_supported() {
+            return Err(Error("Unsupported XCOFF header"));
+        }
+        Ok(header)
+    }
+
+    fn is_supported(&self) -> bool {
+        (self.is_type_64() && self.f_magic() == xcoff::MAGIC_64)
+            || (!self.is_type_64() && self.f_magic() == xcoff::MAGIC_32)
+    }
+
+    /// Read the auxiliary file header.
+    fn aux_header<'data, R: ReadRef<'data>>(
+        &self,
+        data: R,
+        offset: &mut u64,
+    ) -> Result<Option<&'data Self::AuxHeader>> {
+        let aux_header_size = self.f_opthdr();
+        if self.f_flags() & xcoff::F_EXEC == 0 {
+            // No auxiliary header is required for an object file that is not an executable.
+            // TODO: Some AIX programs generate auxiliary headers for 32-bit object files
+            // that end after the data_start field.
+            *offset += u64::from(aux_header_size);
+            return Ok(None);
+        }
+        // Executables, however, must have auxiliary headers that include the
+        // full structure definitions.
+        if aux_header_size != mem::size_of::<Self::AuxHeader>() as u16 {
+            *offset += u64::from(aux_header_size);
+            return Ok(None);
+        }
+        let aux_header = data
+            .read::<Self::AuxHeader>(offset)
+            .read_error("Invalid XCOFF auxiliary header size")?;
+        Ok(Some(aux_header))
+    }
+
+    /// Read the section table.
+    #[inline]
+    fn sections<'data, R: ReadRef<'data>>(
+        &self,
+        data: R,
+        offset: &mut u64,
+    ) -> Result<SectionTable<'data, Self>> {
+        SectionTable::parse(self, data, offset)
+    }
+
+    /// Return the symbol table.
+    #[inline]
+    fn symbols<'data, R: ReadRef<'data>>(&self, data: R) -> Result<SymbolTable<'data, Self, R>> {
+        SymbolTable::parse(*self, data)
+    }
+}
+
+impl FileHeader for xcoff::FileHeader32 {
+    type Word = u32;
+    type AuxHeader = xcoff::AuxHeader32;
+    type SectionHeader = xcoff::SectionHeader32;
+    type Symbol = xcoff::Symbol32;
+    type FileAux = xcoff::FileAux32;
+    type CsectAux = xcoff::CsectAux32;
+
+    fn is_type_64(&self) -> bool {
+        false
+    }
+
+    fn f_magic(&self) -> u16 {
+        self.f_magic.get(BE)
+    }
+
+    fn f_nscns(&self) -> u16 {
+        self.f_nscns.get(BE)
+    }
+
+    fn f_timdat(&self) -> u32 {
+        self.f_timdat.get(BE)
+    }
+
+    fn f_symptr(&self) -> Self::Word {
+        self.f_symptr.get(BE)
+    }
+
+    fn f_nsyms(&self) -> u32 {
+        self.f_nsyms.get(BE)
+    }
+
+    fn f_opthdr(&self) -> u16 {
+        self.f_opthdr.get(BE)
+    }
+
+    fn f_flags(&self) -> u16 {
+        self.f_flags.get(BE)
+    }
+}
+
+impl FileHeader for xcoff::FileHeader64 {
+    type Word = u64;
+    type AuxHeader = xcoff::AuxHeader64;
+    type SectionHeader = xcoff::SectionHeader64;
+    type Symbol = xcoff::Symbol64;
+    type FileAux = xcoff::FileAux64;
+    type CsectAux = xcoff::CsectAux64;
+
+    fn is_type_64(&self) -> bool {
+        true
+    }
+
+    fn f_magic(&self) -> u16 {
+        self.f_magic.get(BE)
+    }
+
+    fn f_nscns(&self) -> u16 {
+        self.f_nscns.get(BE)
+    }
+
+    fn f_timdat(&self) -> u32 {
+        self.f_timdat.get(BE)
+    }
+
+    fn f_symptr(&self) -> Self::Word {
+        self.f_symptr.get(BE)
+    }
+
+    fn f_nsyms(&self) -> u32 {
+        self.f_nsyms.get(BE)
+    }
+
+    fn f_opthdr(&self) -> u16 {
+        self.f_opthdr.get(BE)
+    }
+
+    fn f_flags(&self) -> u16 {
+        self.f_flags.get(BE)
+    }
+}
+
+/// A trait for generic access to [`xcoff::AuxHeader32`] and [`xcoff::AuxHeader64`].
+#[allow(missing_docs)]
+pub trait AuxHeader: Debug + Pod {
+    type Word: Into<u64>;
+
+    fn o_mflag(&self) -> u16;
+    fn o_vstamp(&self) -> u16;
+    fn o_tsize(&self) -> Self::Word;
+    fn o_dsize(&self) -> Self::Word;
+    fn o_bsize(&self) -> Self::Word;
+    fn o_entry(&self) -> Self::Word;
+    fn o_text_start(&self) -> Self::Word;
+    fn o_data_start(&self) -> Self::Word;
+    fn o_toc(&self) -> Self::Word;
+    fn o_snentry(&self) -> u16;
+    fn o_sntext(&self) -> u16;
+    fn o_sndata(&self) -> u16;
+    fn o_sntoc(&self) -> u16;
+    fn o_snloader(&self) -> u16;
+    fn o_snbss(&self) -> u16;
+    fn o_algntext(&self) -> u16;
+    fn o_algndata(&self) -> u16;
+    fn o_modtype(&self) -> u16;
+    fn o_cpuflag(&self) -> u8;
+    fn o_cputype(&self) -> u8;
+    fn o_maxstack(&self) -> Self::Word;
+    fn o_maxdata(&self) -> Self::Word;
+    fn o_debugger(&self) -> u32;
+    fn o_textpsize(&self) -> u8;
+    fn o_datapsize(&self) -> u8;
+    fn o_stackpsize(&self) -> u8;
+    fn o_flags(&self) -> u8;
+    fn o_sntdata(&self) -> u16;
+    fn o_sntbss(&self) -> u16;
+    fn o_x64flags(&self) -> Option<u16>;
+}
+
+impl AuxHeader for xcoff::AuxHeader32 {
+    type Word = u32;
+
+    fn o_mflag(&self) -> u16 {
+        self.o_mflag.get(BE)
+    }
+
+    fn o_vstamp(&self) -> u16 {
+        self.o_vstamp.get(BE)
+    }
+
+    fn o_tsize(&self) -> Self::Word {
+        self.o_tsize.get(BE)
+    }
+
+    fn o_dsize(&self) -> Self::Word {
+        self.o_dsize.get(BE)
+    }
+
+    fn o_bsize(&self) -> Self::Word {
+        self.o_bsize.get(BE)
+    }
+
+    fn o_entry(&self) -> Self::Word {
+        self.o_entry.get(BE)
+    }
+
+    fn o_text_start(&self) -> Self::Word {
+        self.o_text_start.get(BE)
+    }
+
+    fn o_data_start(&self) -> Self::Word {
+        self.o_data_start.get(BE)
+    }
+
+    fn o_toc(&self) -> Self::Word {
+        self.o_toc.get(BE)
+    }
+
+    fn o_snentry(&self) -> u16 {
+        self.o_snentry.get(BE)
+    }
+
+    fn o_sntext(&self) -> u16 {
+        self.o_sntext.get(BE)
+    }
+
+    fn o_sndata(&self) -> u16 {
+        self.o_sndata.get(BE)
+    }
+
+    fn o_sntoc(&self) -> u16 {
+        self.o_sntoc.get(BE)
+    }
+
+    fn o_snloader(&self) -> u16 {
+        self.o_snloader.get(BE)
+    }
+
+    fn o_snbss(&self) -> u16 {
+        self.o_snbss.get(BE)
+    }
+
+    fn o_algntext(&self) -> u16 {
+        self.o_algntext.get(BE)
+    }
+
+    fn o_algndata(&self) -> u16 {
+        self.o_algndata.get(BE)
+    }
+
+    fn o_modtype(&self) -> u16 {
+        self.o_modtype.get(BE)
+    }
+
+    fn o_cpuflag(&self) -> u8 {
+        self.o_cpuflag
+    }
+
+    fn o_cputype(&self) -> u8 {
+        self.o_cputype
+    }
+
+    fn o_maxstack(&self) -> Self::Word {
+        self.o_maxstack.get(BE)
+    }
+
+    fn o_maxdata(&self) -> Self::Word {
+        self.o_maxdata.get(BE)
+    }
+
+    fn o_debugger(&self) -> u32 {
+        self.o_debugger.get(BE)
+    }
+
+    fn o_textpsize(&self) -> u8 {
+        self.o_textpsize
+    }
+
+    fn o_datapsize(&self) -> u8 {
+        self.o_datapsize
+    }
+
+    fn o_stackpsize(&self) -> u8 {
+        self.o_stackpsize
+    }
+
+    fn o_flags(&self) -> u8 {
+        self.o_flags
+    }
+
+    fn o_sntdata(&self) -> u16 {
+        self.o_sntdata.get(BE)
+    }
+
+    fn o_sntbss(&self) -> u16 {
+        self.o_sntbss.get(BE)
+    }
+
+    fn o_x64flags(&self) -> Option<u16> {
+        None
+    }
+}
+
+impl AuxHeader for xcoff::AuxHeader64 {
+    type Word = u64;
+
+    fn o_mflag(&self) -> u16 {
+        self.o_mflag.get(BE)
+    }
+
+    fn o_vstamp(&self) -> u16 {
+        self.o_vstamp.get(BE)
+    }
+
+    fn o_tsize(&self) -> Self::Word {
+        self.o_tsize.get(BE)
+    }
+
+    fn o_dsize(&self) -> Self::Word {
+        self.o_dsize.get(BE)
+    }
+
+    fn o_bsize(&self) -> Self::Word {
+        self.o_bsize.get(BE)
+    }
+
+    fn o_entry(&self) -> Self::Word {
+        self.o_entry.get(BE)
+    }
+
+    fn o_text_start(&self) -> Self::Word {
+        self.o_text_start.get(BE)
+    }
+
+    fn o_data_start(&self) -> Self::Word {
+        self.o_data_start.get(BE)
+    }
+
+    fn o_toc(&self) -> Self::Word {
+        self.o_toc.get(BE)
+    }
+
+    fn o_snentry(&self) -> u16 {
+        self.o_snentry.get(BE)
+    }
+
+    fn o_sntext(&self) -> u16 {
+        self.o_sntext.get(BE)
+    }
+
+    fn o_sndata(&self) -> u16 {
+        self.o_sndata.get(BE)
+    }
+
+    fn o_sntoc(&self) -> u16 {
+        self.o_sntoc.get(BE)
+    }
+
+    fn o_snloader(&self) -> u16 {
+        self.o_snloader.get(BE)
+    }
+
+    fn o_snbss(&self) -> u16 {
+        self.o_snbss.get(BE)
+    }
+
+    fn o_algntext(&self) -> u16 {
+        self.o_algntext.get(BE)
+    }
+
+    fn o_algndata(&self) -> u16 {
+        self.o_algndata.get(BE)
+    }
+
+    fn o_modtype(&self) -> u16 {
+        self.o_modtype.get(BE)
+    }
+
+    fn o_cpuflag(&self) -> u8 {
+        self.o_cpuflag
+    }
+
+    fn o_cputype(&self) -> u8 {
+        self.o_cputype
+    }
+
+    fn o_maxstack(&self) -> Self::Word {
+        self.o_maxstack.get(BE)
+    }
+
+    fn o_maxdata(&self) -> Self::Word {
+        self.o_maxdata.get(BE)
+    }
+
+    fn o_debugger(&self) -> u32 {
+        self.o_debugger.get(BE)
+    }
+
+    fn o_textpsize(&self) -> u8 {
+        self.o_textpsize
+    }
+
+    fn o_datapsize(&self) -> u8 {
+        self.o_datapsize
+    }
+
+    fn o_stackpsize(&self) -> u8 {
+        self.o_stackpsize
+    }
+
+    fn o_flags(&self) -> u8 {
+        self.o_flags
+    }
+
+    fn o_sntdata(&self) -> u16 {
+        self.o_sntdata.get(BE)
+    }
+
+    fn o_sntbss(&self) -> u16 {
+        self.o_sntbss.get(BE)
+    }
+
+    fn o_x64flags(&self) -> Option<u16> {
+        Some(self.o_x64flags.get(BE))
+    }
+}

vendor/object/src/read/xcoff/mod.rs

@@ -0,0 +1,63 @@
+//! Support for reading AIX XCOFF files.
+//!
+//! Traits are used to abstract over the difference between 32-bit and 64-bit XCOFF.
+//! The primary trait for this is [`FileHeader`].
+//!
+//! ## High level API
+//!
+//! [`XcoffFile`] implements the [`Object`](crate::read::Object) trait for XCOFF files.
+//! [`XcoffFile`] is parameterised by [`FileHeader`] to allow reading both 32-bit and
+//! 64-bit XCOFF. There are type aliases for these parameters ([`XcoffFile32`] and
+//! [`XcoffFile64`]).
+//!
+//! ## Low level API
+//!
+//! The [`FileHeader`] trait can be directly used to parse both [`xcoff::FileHeader32`]
+//! and [`xcoff::FileHeader64`].
+//!
+//! ### Example for low level API
+//!  ```no_run
+//! use object::xcoff;
+//! use object::read::xcoff::{FileHeader, SectionHeader, Symbol};
+//! use std::error::Error;
+//! use std::fs;
+//!
+//! /// Reads a file and displays the name of each section and symbol.
+//! fn main() -> Result<(), Box<dyn Error>> {
+//! #   #[cfg(feature = "std")] {
+//!     let data = fs::read("path/to/binary")?;
+//!     let mut offset = 0;
+//!     let header = xcoff::FileHeader64::parse(&*data, &mut offset)?;
+//!     let aux_header = header.aux_header(&*data, &mut offset)?;
+//!     let sections = header.sections(&*data, &mut offset)?;
+//!     let symbols = header.symbols(&*data)?;
+//!     for section in sections.iter() {
+//!         println!("{}", String::from_utf8_lossy(section.name()));
+//!     }
+//!     for (_index, symbol) in symbols.iter() {
+//!         println!("{}", String::from_utf8_lossy(symbol.name(symbols.strings())?));
+//!     }
+//! #   }
+//!     Ok(())
+//! }
+//! ```
+#[cfg(doc)]
+use crate::xcoff;
+
+mod file;
+pub use file::*;
+
+mod section;
+pub use section::*;
+
+mod symbol;
+pub use symbol::*;
+
+mod relocation;
+pub use relocation::*;
+
+mod comdat;
+pub use comdat::*;
+
+mod segment;
+pub use segment::*;

vendor/object/src/read/xcoff/relocation.rs

@@ -0,0 +1,127 @@
+use alloc::fmt;
+use core::fmt::Debug;
+use core::slice;
+
+use crate::pod::Pod;
+use crate::{xcoff, BigEndian as BE, Relocation};
+
+use crate::read::{ReadRef, RelocationEncoding, RelocationKind, RelocationTarget, SymbolIndex};
+
+use super::{FileHeader, SectionHeader, XcoffFile};
+
+/// An iterator for the relocations in an [`XcoffSection32`](super::XcoffSection32).
+pub type XcoffRelocationIterator32<'data, 'file, R = &'data [u8]> =
+    XcoffRelocationIterator<'data, 'file, xcoff::FileHeader32, R>;
+/// An iterator for the relocations in an [`XcoffSection64`](super::XcoffSection64).
+pub type XcoffRelocationIterator64<'data, 'file, R = &'data [u8]> =
+    XcoffRelocationIterator<'data, 'file, xcoff::FileHeader64, R>;
+
+/// An iterator for the relocations in an [`XcoffSection`](super::XcoffSection).
+pub struct XcoffRelocationIterator<'data, 'file, Xcoff, R = &'data [u8]>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    #[allow(unused)]
+    pub(super) file: &'file XcoffFile<'data, Xcoff, R>,
+    pub(super) relocations:
+        slice::Iter<'data, <<Xcoff as FileHeader>::SectionHeader as SectionHeader>::Rel>,
+}
+
+impl<'data, 'file, Xcoff, R> Iterator for XcoffRelocationIterator<'data, 'file, Xcoff, R>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    type Item = (u64, Relocation);
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.relocations.next().map(|relocation| {
+            let encoding = RelocationEncoding::Generic;
+            let (kind, addend) = match relocation.r_rtype() {
+                xcoff::R_POS
+                | xcoff::R_RL
+                | xcoff::R_RLA
+                | xcoff::R_BA
+                | xcoff::R_RBA
+                | xcoff::R_TLS => (RelocationKind::Absolute, 0),
+                xcoff::R_REL | xcoff::R_BR | xcoff::R_RBR => (RelocationKind::Relative, -4),
+                xcoff::R_TOC | xcoff::R_TOCL | xcoff::R_TOCU => (RelocationKind::Got, 0),
+                r_type => (RelocationKind::Xcoff(r_type), 0),
+            };
+            let size = (relocation.r_rsize() & 0x3F) + 1;
+            let target = RelocationTarget::Symbol(SymbolIndex(relocation.r_symndx() as usize));
+            (
+                relocation.r_vaddr().into(),
+                Relocation {
+                    kind,
+                    encoding,
+                    size,
+                    target,
+                    addend,
+                    implicit_addend: true,
+                },
+            )
+        })
+    }
+}
+
+impl<'data, 'file, Xcoff, R> fmt::Debug for XcoffRelocationIterator<'data, 'file, Xcoff, R>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("XcoffRelocationIterator").finish()
+    }
+}
+
+/// A trait for generic access to [`xcoff::Rel32`] and [`xcoff::Rel64`].
+#[allow(missing_docs)]
+pub trait Rel: Debug + Pod {
+    type Word: Into<u64>;
+    fn r_vaddr(&self) -> Self::Word;
+    fn r_symndx(&self) -> u32;
+    fn r_rsize(&self) -> u8;
+    fn r_rtype(&self) -> u8;
+}
+
+impl Rel for xcoff::Rel32 {
+    type Word = u32;
+
+    fn r_vaddr(&self) -> Self::Word {
+        self.r_vaddr.get(BE)
+    }
+
+    fn r_symndx(&self) -> u32 {
+        self.r_symndx.get(BE)
+    }
+
+    fn r_rsize(&self) -> u8 {
+        self.r_rsize
+    }
+
+    fn r_rtype(&self) -> u8 {
+        self.r_rtype
+    }
+}
+
+impl Rel for xcoff::Rel64 {
+    type Word = u64;
+
+    fn r_vaddr(&self) -> Self::Word {
+        self.r_vaddr.get(BE)
+    }
+
+    fn r_symndx(&self) -> u32 {
+        self.r_symndx.get(BE)
+    }
+
+    fn r_rsize(&self) -> u8 {
+        self.r_rsize
+    }
+
+    fn r_rtype(&self) -> u8 {
+        self.r_rtype
+    }
+}

vendor/object/src/read/xcoff/section.rs

@@ -0,0 +1,431 @@
+use core::fmt::Debug;
+use core::{iter, result, slice, str};
+
+use crate::{
+    xcoff, BigEndian as BE, CompressedData, CompressedFileRange, Pod, SectionFlags, SectionKind,
+};
+
+use crate::read::{self, Error, ObjectSection, ReadError, ReadRef, Result, SectionIndex};
+
+use super::{AuxHeader, FileHeader, Rel, XcoffFile, XcoffRelocationIterator};
+
+/// An iterator for the sections in an [`XcoffFile32`](super::XcoffFile32).
+pub type XcoffSectionIterator32<'data, 'file, R = &'data [u8]> =
+    XcoffSectionIterator<'data, 'file, xcoff::FileHeader32, R>;
+/// An iterator for the sections in an [`XcoffFile64`](super::XcoffFile64).
+pub type XcoffSectionIterator64<'data, 'file, R = &'data [u8]> =
+    XcoffSectionIterator<'data, 'file, xcoff::FileHeader64, R>;
+
+/// An iterator for the sections in an [`XcoffFile`].
+#[derive(Debug)]
+pub struct XcoffSectionIterator<'data, 'file, Xcoff, R = &'data [u8]>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) file: &'file XcoffFile<'data, Xcoff, R>,
+    pub(super) iter: iter::Enumerate<slice::Iter<'data, Xcoff::SectionHeader>>,
+}
+
+impl<'data, 'file, Xcoff, R> Iterator for XcoffSectionIterator<'data, 'file, Xcoff, R>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    type Item = XcoffSection<'data, 'file, Xcoff, R>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.iter.next().map(|(index, section)| XcoffSection {
+            index: SectionIndex(index + 1),
+            file: self.file,
+            section,
+        })
+    }
+}
+
+/// A section in an [`XcoffFile32`](super::XcoffFile32).
+pub type XcoffSection32<'data, 'file, R = &'data [u8]> =
+    XcoffSection<'data, 'file, xcoff::FileHeader32, R>;
+/// A section in an [`XcoffFile64`](super::XcoffFile64).
+pub type XcoffSection64<'data, 'file, R = &'data [u8]> =
+    XcoffSection<'data, 'file, xcoff::FileHeader64, R>;
+
+/// A section in an [`XcoffFile`].
+///
+/// Most functionality is provided by the [`ObjectSection`] trait implementation.
+#[derive(Debug)]
+pub struct XcoffSection<'data, 'file, Xcoff, R = &'data [u8]>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) file: &'file XcoffFile<'data, Xcoff, R>,
+    pub(super) section: &'data Xcoff::SectionHeader,
+    pub(super) index: SectionIndex,
+}
+
+impl<'data, 'file, Xcoff: FileHeader, R: ReadRef<'data>> XcoffSection<'data, 'file, Xcoff, R> {
+    fn bytes(&self) -> Result<&'data [u8]> {
+        self.section
+            .data(self.file.data)
+            .read_error("Invalid XCOFF section offset or size")
+    }
+}
+
+impl<'data, 'file, Xcoff, R> read::private::Sealed for XcoffSection<'data, 'file, Xcoff, R>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+}
+
+impl<'data, 'file, Xcoff, R> ObjectSection<'data> for XcoffSection<'data, 'file, Xcoff, R>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    type RelocationIterator = XcoffRelocationIterator<'data, 'file, Xcoff, R>;
+
+    fn index(&self) -> SectionIndex {
+        self.index
+    }
+
+    fn address(&self) -> u64 {
+        self.section.s_paddr().into()
+    }
+
+    fn size(&self) -> u64 {
+        self.section.s_size().into()
+    }
+
+    fn align(&self) -> u64 {
+        // The default section alignment is 4.
+        if let Some(aux_header) = self.file.aux_header {
+            match self.kind() {
+                SectionKind::Text => aux_header.o_algntext().into(),
+                SectionKind::Data => aux_header.o_algndata().into(),
+                _ => 4,
+            }
+        } else {
+            4
+        }
+    }
+
+    fn file_range(&self) -> Option<(u64, u64)> {
+        self.section.file_range()
+    }
+
+    fn data(&self) -> Result<&'data [u8]> {
+        self.bytes()
+    }
+
+    fn data_range(&self, address: u64, size: u64) -> Result<Option<&'data [u8]>> {
+        Ok(read::util::data_range(
+            self.bytes()?,
+            self.address(),
+            address,
+            size,
+        ))
+    }
+
+    fn compressed_file_range(&self) -> Result<CompressedFileRange> {
+        Ok(CompressedFileRange::none(self.file_range()))
+    }
+
+    fn compressed_data(&self) -> Result<CompressedData<'data>> {
+        self.data().map(CompressedData::none)
+    }
+
+    fn name_bytes(&self) -> read::Result<&[u8]> {
+        Ok(self.section.name())
+    }
+
+    fn name(&self) -> read::Result<&str> {
+        let name = self.name_bytes()?;
+        str::from_utf8(name)
+            .ok()
+            .read_error("Non UTF-8 XCOFF section name")
+    }
+
+    fn segment_name_bytes(&self) -> Result<Option<&[u8]>> {
+        Ok(None)
+    }
+
+    fn segment_name(&self) -> Result<Option<&str>> {
+        Ok(None)
+    }
+
+    fn kind(&self) -> SectionKind {
+        let section_type = self.section.s_flags() as u16;
+        if section_type & xcoff::STYP_TEXT != 0 {
+            SectionKind::Text
+        } else if section_type & xcoff::STYP_DATA != 0 {
+            SectionKind::Data
+        } else if section_type & xcoff::STYP_TDATA != 0 {
+            SectionKind::Tls
+        } else if section_type & xcoff::STYP_BSS != 0 {
+            SectionKind::UninitializedData
+        } else if section_type & xcoff::STYP_TBSS != 0 {
+            SectionKind::UninitializedTls
+        } else if section_type & (xcoff::STYP_DEBUG | xcoff::STYP_DWARF) != 0 {
+            SectionKind::Debug
+        } else if section_type & (xcoff::STYP_LOADER | xcoff::STYP_OVRFLO) != 0 {
+            SectionKind::Metadata
+        } else if section_type
+            & (xcoff::STYP_INFO | xcoff::STYP_EXCEPT | xcoff::STYP_PAD | xcoff::STYP_TYPCHK)
+            != 0
+        {
+            SectionKind::Other
+        } else {
+            SectionKind::Unknown
+        }
+    }
+
+    fn relocations(&self) -> Self::RelocationIterator {
+        let rel = self.section.relocations(self.file.data).unwrap_or(&[]);
+        XcoffRelocationIterator {
+            file: self.file,
+            relocations: rel.iter(),
+        }
+    }
+
+    fn flags(&self) -> SectionFlags {
+        SectionFlags::Xcoff {
+            s_flags: self.section.s_flags(),
+        }
+    }
+
+    fn uncompressed_data(&self) -> Result<alloc::borrow::Cow<'data, [u8]>> {
+        self.compressed_data()?.decompress()
+    }
+}
+
+/// The table of section headers in an XCOFF file.
+///
+/// Returned by [`FileHeader::sections`].
+#[derive(Debug, Clone, Copy)]
+pub struct SectionTable<'data, Xcoff: FileHeader> {
+    sections: &'data [Xcoff::SectionHeader],
+}
+
+impl<'data, Xcoff> Default for SectionTable<'data, Xcoff>
+where
+    Xcoff: FileHeader,
+{
+    fn default() -> Self {
+        Self { sections: &[] }
+    }
+}
+
+impl<'data, Xcoff> SectionTable<'data, Xcoff>
+where
+    Xcoff: FileHeader,
+{
+    /// Parse the section table.
+    ///
+    /// `data` must be the entire file data.
+    /// `offset` must be after the optional file header.
+    pub fn parse<R: ReadRef<'data>>(header: &Xcoff, data: R, offset: &mut u64) -> Result<Self> {
+        let section_num = header.f_nscns();
+        if section_num == 0 {
+            return Ok(SectionTable::default());
+        }
+        let sections = data
+            .read_slice(offset, section_num as usize)
+            .read_error("Invalid XCOFF section headers")?;
+        Ok(SectionTable { sections })
+    }
+
+    /// Iterate over the section headers.
+    #[inline]
+    pub fn iter(&self) -> slice::Iter<'data, Xcoff::SectionHeader> {
+        self.sections.iter()
+    }
+
+    /// Return true if the section table is empty.
+    #[inline]
+    pub fn is_empty(&self) -> bool {
+        self.sections.is_empty()
+    }
+
+    /// The number of section headers.
+    #[inline]
+    pub fn len(&self) -> usize {
+        self.sections.len()
+    }
+
+    /// Return the section header at the given index.
+    ///
+    /// The index is 1-based.
+    pub fn section(&self, index: SectionIndex) -> read::Result<&'data Xcoff::SectionHeader> {
+        self.sections
+            .get(index.0.wrapping_sub(1))
+            .read_error("Invalid XCOFF section index")
+    }
+}
+
+/// A trait for generic access to [`xcoff::SectionHeader32`] and [`xcoff::SectionHeader64`].
+#[allow(missing_docs)]
+pub trait SectionHeader: Debug + Pod {
+    type Word: Into<u64>;
+    type HalfWord: Into<u32>;
+    type Xcoff: FileHeader<SectionHeader = Self, Word = Self::Word>;
+    type Rel: Rel<Word = Self::Word>;
+
+    fn s_name(&self) -> &[u8; 8];
+    fn s_paddr(&self) -> Self::Word;
+    fn s_vaddr(&self) -> Self::Word;
+    fn s_size(&self) -> Self::Word;
+    fn s_scnptr(&self) -> Self::Word;
+    fn s_relptr(&self) -> Self::Word;
+    fn s_lnnoptr(&self) -> Self::Word;
+    fn s_nreloc(&self) -> Self::HalfWord;
+    fn s_nlnno(&self) -> Self::HalfWord;
+    fn s_flags(&self) -> u32;
+
+    /// Return the section name.
+    fn name(&self) -> &[u8] {
+        let sectname = &self.s_name()[..];
+        match memchr::memchr(b'\0', sectname) {
+            Some(end) => &sectname[..end],
+            None => sectname,
+        }
+    }
+
+    /// Return the offset and size of the section in the file.
+    fn file_range(&self) -> Option<(u64, u64)> {
+        Some((self.s_scnptr().into(), self.s_size().into()))
+    }
+
+    /// Return the section data.
+    ///
+    /// Returns `Ok(&[])` if the section has no data.
+    /// Returns `Err` for invalid values.
+    fn data<'data, R: ReadRef<'data>>(&self, data: R) -> result::Result<&'data [u8], ()> {
+        if let Some((offset, size)) = self.file_range() {
+            data.read_bytes_at(offset, size)
+        } else {
+            Ok(&[])
+        }
+    }
+
+    /// Read the relocations.
+    fn relocations<'data, R: ReadRef<'data>>(&self, data: R) -> read::Result<&'data [Self::Rel]>;
+}
+
+impl SectionHeader for xcoff::SectionHeader32 {
+    type Word = u32;
+    type HalfWord = u16;
+    type Xcoff = xcoff::FileHeader32;
+    type Rel = xcoff::Rel32;
+
+    fn s_name(&self) -> &[u8; 8] {
+        &self.s_name
+    }
+
+    fn s_paddr(&self) -> Self::Word {
+        self.s_paddr.get(BE)
+    }
+
+    fn s_vaddr(&self) -> Self::Word {
+        self.s_vaddr.get(BE)
+    }
+
+    fn s_size(&self) -> Self::Word {
+        self.s_size.get(BE)
+    }
+
+    fn s_scnptr(&self) -> Self::Word {
+        self.s_scnptr.get(BE)
+    }
+
+    fn s_relptr(&self) -> Self::Word {
+        self.s_relptr.get(BE)
+    }
+
+    fn s_lnnoptr(&self) -> Self::Word {
+        self.s_lnnoptr.get(BE)
+    }
+
+    fn s_nreloc(&self) -> Self::HalfWord {
+        self.s_nreloc.get(BE)
+    }
+
+    fn s_nlnno(&self) -> Self::HalfWord {
+        self.s_nlnno.get(BE)
+    }
+
+    fn s_flags(&self) -> u32 {
+        self.s_flags.get(BE)
+    }
+
+    /// Read the relocations in a XCOFF32 file.
+    ///
+    /// `data` must be the entire file data.
+    fn relocations<'data, R: ReadRef<'data>>(&self, data: R) -> read::Result<&'data [Self::Rel]> {
+        let reloc_num = self.s_nreloc() as usize;
+        // TODO: If more than 65,534 relocation entries are required, the field value will be 65535,
+        // and an STYP_OVRFLO section header will contain the actual count of relocation entries in
+        // the s_paddr field.
+        if reloc_num == 65535 {
+            return Err(Error("Overflow section is not supported yet."));
+        }
+        data.read_slice_at(self.s_relptr().into(), reloc_num)
+            .read_error("Invalid XCOFF relocation offset or number")
+    }
+}
+
+impl SectionHeader for xcoff::SectionHeader64 {
+    type Word = u64;
+    type HalfWord = u32;
+    type Xcoff = xcoff::FileHeader64;
+    type Rel = xcoff::Rel64;
+
+    fn s_name(&self) -> &[u8; 8] {
+        &self.s_name
+    }
+
+    fn s_paddr(&self) -> Self::Word {
+        self.s_paddr.get(BE)
+    }
+
+    fn s_vaddr(&self) -> Self::Word {
+        self.s_vaddr.get(BE)
+    }
+
+    fn s_size(&self) -> Self::Word {
+        self.s_size.get(BE)
+    }
+
+    fn s_scnptr(&self) -> Self::Word {
+        self.s_scnptr.get(BE)
+    }
+
+    fn s_relptr(&self) -> Self::Word {
+        self.s_relptr.get(BE)
+    }
+
+    fn s_lnnoptr(&self) -> Self::Word {
+        self.s_lnnoptr.get(BE)
+    }
+
+    fn s_nreloc(&self) -> Self::HalfWord {
+        self.s_nreloc.get(BE)
+    }
+
+    fn s_nlnno(&self) -> Self::HalfWord {
+        self.s_nlnno.get(BE)
+    }
+
+    fn s_flags(&self) -> u32 {
+        self.s_flags.get(BE)
+    }
+
+    /// Read the relocations in a XCOFF64 file.
+    ///
+    /// `data` must be the entire file data.
+    fn relocations<'data, R: ReadRef<'data>>(&self, data: R) -> read::Result<&'data [Self::Rel]> {
+        data.read_slice_at(self.s_relptr(), self.s_nreloc() as usize)
+            .read_error("Invalid XCOFF relocation offset or number")
+    }
+}

vendor/object/src/read/xcoff/segment.rs

@@ -0,0 +1,117 @@
+//! TODO: Support the segment for XCOFF when auxiliary file header and loader section is ready.
+
+use core::fmt::Debug;
+use core::str;
+
+use crate::read::{self, ObjectSegment, ReadRef, Result};
+use crate::xcoff;
+
+use super::{FileHeader, XcoffFile};
+
+/// An iterator for the segments in an [`XcoffFile32`](super::XcoffFile32).
+pub type XcoffSegmentIterator32<'data, 'file, R = &'data [u8]> =
+    XcoffSegmentIterator<'data, 'file, xcoff::FileHeader32, R>;
+/// An iterator for the segments in an [`XcoffFile64`](super::XcoffFile64).
+pub type XcoffSegmentIterator64<'data, 'file, R = &'data [u8]> =
+    XcoffSegmentIterator<'data, 'file, xcoff::FileHeader64, R>;
+
+/// An iterator for the segments in an [`XcoffFile`].
+///
+/// This is a stub that doesn't implement any functionality.
+#[derive(Debug)]
+pub struct XcoffSegmentIterator<'data, 'file, Xcoff, R = &'data [u8]>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    #[allow(unused)]
+    pub(super) file: &'file XcoffFile<'data, Xcoff, R>,
+}
+
+impl<'data, 'file, Xcoff, R> Iterator for XcoffSegmentIterator<'data, 'file, Xcoff, R>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    type Item = XcoffSegment<'data, 'file, Xcoff, R>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        None
+    }
+}
+
+/// A segment in an [`XcoffFile32`](super::XcoffFile32).
+pub type XcoffSegment32<'data, 'file, R = &'data [u8]> =
+    XcoffSegment<'data, 'file, xcoff::FileHeader32, R>;
+/// A segment in an [`XcoffFile64`](super::XcoffFile64).
+pub type XcoffSegment64<'data, 'file, R = &'data [u8]> =
+    XcoffSegment<'data, 'file, xcoff::FileHeader64, R>;
+
+/// A loadable section in an [`XcoffFile`].
+///
+/// This is a stub that doesn't implement any functionality.
+#[derive(Debug)]
+pub struct XcoffSegment<'data, 'file, Xcoff, R = &'data [u8]>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    #[allow(unused)]
+    pub(super) file: &'file XcoffFile<'data, Xcoff, R>,
+}
+
+impl<'data, 'file, Xcoff, R> XcoffSegment<'data, 'file, Xcoff, R>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+}
+
+impl<'data, 'file, Xcoff, R> read::private::Sealed for XcoffSegment<'data, 'file, Xcoff, R>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+}
+
+impl<'data, 'file, Xcoff, R> ObjectSegment<'data> for XcoffSegment<'data, 'file, Xcoff, R>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    fn address(&self) -> u64 {
+        unreachable!();
+    }
+
+    fn size(&self) -> u64 {
+        unreachable!();
+    }
+
+    fn align(&self) -> u64 {
+        unreachable!();
+    }
+
+    fn file_range(&self) -> (u64, u64) {
+        unreachable!();
+    }
+
+    fn data(&self) -> Result<&'data [u8]> {
+        unreachable!();
+    }
+
+    fn data_range(&self, _address: u64, _size: u64) -> Result<Option<&'data [u8]>> {
+        unreachable!();
+    }
+
+    fn name_bytes(&self) -> Result<Option<&[u8]>> {
+        unreachable!();
+    }
+
+    fn name(&self) -> Result<Option<&str>> {
+        unreachable!();
+    }
+
+    fn flags(&self) -> crate::SegmentFlags {
+        unreachable!();
+    }
+}

vendor/object/src/read/xcoff/symbol.rs

@@ -0,0 +1,786 @@
+use alloc::fmt;
+use core::convert::TryInto;
+use core::fmt::Debug;
+use core::marker::PhantomData;
+use core::str;
+
+use crate::endian::{BigEndian as BE, U32Bytes};
+use crate::pod::{bytes_of, Pod};
+use crate::read::util::StringTable;
+use crate::xcoff;
+
+use crate::read::{
+    self, Bytes, Error, ObjectSymbol, ObjectSymbolTable, ReadError, ReadRef, Result, SectionIndex,
+    SymbolFlags, SymbolIndex, SymbolKind, SymbolScope, SymbolSection,
+};
+
+use super::{FileHeader, XcoffFile};
+
+/// A table of symbol entries in an XCOFF file.
+///
+/// Also includes the string table used for the symbol names.
+///
+/// Returned by [`FileHeader::symbols`].
+#[derive(Debug)]
+pub struct SymbolTable<'data, Xcoff, R = &'data [u8]>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    symbols: &'data [xcoff::SymbolBytes],
+    strings: StringTable<'data, R>,
+    header: PhantomData<Xcoff>,
+}
+
+impl<'data, Xcoff, R> Default for SymbolTable<'data, Xcoff, R>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    fn default() -> Self {
+        Self {
+            symbols: &[],
+            strings: StringTable::default(),
+            header: PhantomData,
+        }
+    }
+}
+
+impl<'data, Xcoff, R> SymbolTable<'data, Xcoff, R>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    /// Parse the symbol table.
+    pub fn parse(header: Xcoff, data: R) -> Result<Self> {
+        let mut offset = header.f_symptr().into();
+        let (symbols, strings) = if offset != 0 {
+            let symbols = data
+                .read_slice(&mut offset, header.f_nsyms() as usize)
+                .read_error("Invalid XCOFF symbol table offset or size")?;
+
+            // Parse the string table.
+            // Note: don't update data when reading length; the length includes itself.
+            let length = data
+                .read_at::<U32Bytes<_>>(offset)
+                .read_error("Missing XCOFF string table")?
+                .get(BE);
+            let str_end = offset
+                .checked_add(length as u64)
+                .read_error("Invalid XCOFF string table length")?;
+            let strings = StringTable::new(data, offset, str_end);
+
+            (symbols, strings)
+        } else {
+            (&[][..], StringTable::default())
+        };
+
+        Ok(SymbolTable {
+            symbols,
+            strings,
+            header: PhantomData,
+        })
+    }
+
+    /// Return the string table used for the symbol names.
+    #[inline]
+    pub fn strings(&self) -> StringTable<'data, R> {
+        self.strings
+    }
+
+    /// Iterate over the symbols.
+    #[inline]
+    pub fn iter<'table>(&'table self) -> SymbolIterator<'data, 'table, Xcoff, R> {
+        SymbolIterator {
+            symbols: self,
+            index: 0,
+        }
+    }
+
+    /// Empty symbol iterator.
+    #[inline]
+    pub(super) fn iter_none<'table>(&'table self) -> SymbolIterator<'data, 'table, Xcoff, R> {
+        SymbolIterator {
+            symbols: self,
+            index: self.symbols.len(),
+        }
+    }
+
+    /// Return the symbol entry at the given index and offset.
+    pub fn get<T: Pod>(&self, index: usize, offset: usize) -> Result<&'data T> {
+        let entry = index
+            .checked_add(offset)
+            .and_then(|x| self.symbols.get(x))
+            .read_error("Invalid XCOFF symbol index")?;
+        let bytes = bytes_of(entry);
+        Bytes(bytes).read().read_error("Invalid XCOFF symbol data")
+    }
+
+    /// Return the symbol at the given index.
+    pub fn symbol(&self, index: usize) -> Result<&'data Xcoff::Symbol> {
+        self.get::<Xcoff::Symbol>(index, 0)
+    }
+
+    /// Return a file auxiliary symbol.
+    pub fn aux_file(&self, index: usize, offset: usize) -> Result<&'data Xcoff::FileAux> {
+        debug_assert!(self.symbol(index)?.has_aux_file());
+        let aux_file = self.get::<Xcoff::FileAux>(index, offset)?;
+        if let Some(aux_type) = aux_file.x_auxtype() {
+            if aux_type != xcoff::AUX_FILE {
+                return Err(Error("Invalid index for file auxiliary symbol."));
+            }
+        }
+        Ok(aux_file)
+    }
+
+    /// Return the csect auxiliary symbol.
+    pub fn aux_csect(&self, index: usize, offset: usize) -> Result<&'data Xcoff::CsectAux> {
+        debug_assert!(self.symbol(index)?.has_aux_csect());
+        let aux_csect = self.get::<Xcoff::CsectAux>(index, offset)?;
+        if let Some(aux_type) = aux_csect.x_auxtype() {
+            if aux_type != xcoff::AUX_CSECT {
+                return Err(Error("Invalid index/offset for csect auxiliary symbol."));
+            }
+        }
+        Ok(aux_csect)
+    }
+
+    /// Return true if the symbol table is empty.
+    #[inline]
+    pub fn is_empty(&self) -> bool {
+        self.symbols.is_empty()
+    }
+
+    /// The number of symbol table entries.
+    ///
+    /// This includes auxiliary symbol table entries.
+    #[inline]
+    pub fn len(&self) -> usize {
+        self.symbols.len()
+    }
+}
+
+/// An iterator for symbol entries in an XCOFF file.
+///
+/// Yields the index and symbol structure for each symbol.
+#[derive(Debug)]
+pub struct SymbolIterator<'data, 'table, Xcoff, R = &'data [u8]>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    symbols: &'table SymbolTable<'data, Xcoff, R>,
+    index: usize,
+}
+
+impl<'data, 'table, Xcoff: FileHeader, R: ReadRef<'data>> Iterator
+    for SymbolIterator<'data, 'table, Xcoff, R>
+{
+    type Item = (SymbolIndex, &'data Xcoff::Symbol);
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let index = self.index;
+        let symbol = self.symbols.symbol(index).ok()?;
+        self.index += 1 + symbol.n_numaux() as usize;
+        Some((SymbolIndex(index), symbol))
+    }
+}
+
+/// A symbol table in an [`XcoffFile32`](super::XcoffFile32).
+pub type XcoffSymbolTable32<'data, 'file, R = &'data [u8]> =
+    XcoffSymbolTable<'data, 'file, xcoff::FileHeader32, R>;
+/// A symbol table in an [`XcoffFile64`](super::XcoffFile64).
+pub type XcoffSymbolTable64<'data, 'file, R = &'data [u8]> =
+    XcoffSymbolTable<'data, 'file, xcoff::FileHeader64, R>;
+
+/// A symbol table in an [`XcoffFile`].
+#[derive(Debug, Clone, Copy)]
+pub struct XcoffSymbolTable<'data, 'file, Xcoff, R = &'data [u8]>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) file: &'file XcoffFile<'data, Xcoff, R>,
+    pub(super) symbols: &'file SymbolTable<'data, Xcoff, R>,
+}
+
+impl<'data, 'file, Xcoff: FileHeader, R: ReadRef<'data>> read::private::Sealed
+    for XcoffSymbolTable<'data, 'file, Xcoff, R>
+{
+}
+
+impl<'data, 'file, Xcoff: FileHeader, R: ReadRef<'data>> ObjectSymbolTable<'data>
+    for XcoffSymbolTable<'data, 'file, Xcoff, R>
+{
+    type Symbol = XcoffSymbol<'data, 'file, Xcoff, R>;
+    type SymbolIterator = XcoffSymbolIterator<'data, 'file, Xcoff, R>;
+
+    fn symbols(&self) -> Self::SymbolIterator {
+        XcoffSymbolIterator {
+            file: self.file,
+            symbols: self.symbols.iter(),
+        }
+    }
+
+    fn symbol_by_index(&self, index: SymbolIndex) -> read::Result<Self::Symbol> {
+        let symbol = self.symbols.symbol(index.0)?;
+        Ok(XcoffSymbol {
+            file: self.file,
+            symbols: self.symbols,
+            index,
+            symbol,
+        })
+    }
+}
+
+/// An iterator for the symbols in an [`XcoffFile32`](super::XcoffFile32).
+pub type XcoffSymbolIterator32<'data, 'file, R = &'data [u8]> =
+    XcoffSymbolIterator<'data, 'file, xcoff::FileHeader32, R>;
+/// An iterator for the symbols in an [`XcoffFile64`](super::XcoffFile64).
+pub type XcoffSymbolIterator64<'data, 'file, R = &'data [u8]> =
+    XcoffSymbolIterator<'data, 'file, xcoff::FileHeader64, R>;
+
+/// An iterator for the symbols in an [`XcoffFile`].
+pub struct XcoffSymbolIterator<'data, 'file, Xcoff, R = &'data [u8]>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) file: &'file XcoffFile<'data, Xcoff, R>,
+    pub(super) symbols: SymbolIterator<'data, 'file, Xcoff, R>,
+}
+
+impl<'data, 'file, Xcoff: FileHeader, R: ReadRef<'data>> fmt::Debug
+    for XcoffSymbolIterator<'data, 'file, Xcoff, R>
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("XcoffSymbolIterator").finish()
+    }
+}
+
+impl<'data, 'file, Xcoff: FileHeader, R: ReadRef<'data>> Iterator
+    for XcoffSymbolIterator<'data, 'file, Xcoff, R>
+{
+    type Item = XcoffSymbol<'data, 'file, Xcoff, R>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let (index, symbol) = self.symbols.next()?;
+        Some(XcoffSymbol {
+            file: self.file,
+            symbols: self.symbols.symbols,
+            index,
+            symbol,
+        })
+    }
+}
+
+/// A symbol in an [`XcoffFile32`](super::XcoffFile32).
+pub type XcoffSymbol32<'data, 'file, R = &'data [u8]> =
+    XcoffSymbol<'data, 'file, xcoff::FileHeader32, R>;
+/// A symbol in an [`XcoffFile64`](super::XcoffFile64).
+pub type XcoffSymbol64<'data, 'file, R = &'data [u8]> =
+    XcoffSymbol<'data, 'file, xcoff::FileHeader64, R>;
+
+/// A symbol in an [`XcoffFile`].
+///
+/// Most functionality is provided by the [`ObjectSymbol`] trait implementation.
+#[derive(Debug, Clone, Copy)]
+pub struct XcoffSymbol<'data, 'file, Xcoff, R = &'data [u8]>
+where
+    Xcoff: FileHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) file: &'file XcoffFile<'data, Xcoff, R>,
+    pub(super) symbols: &'file SymbolTable<'data, Xcoff, R>,
+    pub(super) index: SymbolIndex,
+    pub(super) symbol: &'data Xcoff::Symbol,
+}
+
+impl<'data, 'file, Xcoff: FileHeader, R: ReadRef<'data>> read::private::Sealed
+    for XcoffSymbol<'data, 'file, Xcoff, R>
+{
+}
+
+impl<'data, 'file, Xcoff: FileHeader, R: ReadRef<'data>> ObjectSymbol<'data>
+    for XcoffSymbol<'data, 'file, Xcoff, R>
+{
+    #[inline]
+    fn index(&self) -> SymbolIndex {
+        self.index
+    }
+
+    fn name_bytes(&self) -> Result<&'data [u8]> {
+        if self.symbol.has_aux_file() {
+            // By convention the file name is in the first auxiliary entry.
+            self.symbols
+                .aux_file(self.index.0, 1)?
+                .fname(self.symbols.strings)
+        } else {
+            self.symbol.name(self.symbols.strings)
+        }
+    }
+
+    fn name(&self) -> Result<&'data str> {
+        let name = self.name_bytes()?;
+        str::from_utf8(name)
+            .ok()
+            .read_error("Non UTF-8 XCOFF symbol name")
+    }
+
+    #[inline]
+    fn address(&self) -> u64 {
+        match self.symbol.n_sclass() {
+            // Relocatable address.
+            xcoff::C_EXT
+            | xcoff::C_WEAKEXT
+            | xcoff::C_HIDEXT
+            | xcoff::C_FCN
+            | xcoff::C_BLOCK
+            | xcoff::C_STAT
+            | xcoff::C_INFO => self.symbol.n_value().into(),
+            _ => 0,
+        }
+    }
+
+    #[inline]
+    fn size(&self) -> u64 {
+        if self.symbol.has_aux_csect() {
+            // XCOFF32 must have the csect auxiliary entry as the last auxiliary entry.
+            // XCOFF64 doesn't require this, but conventionally does.
+            if let Ok(aux_csect) = self
+                .file
+                .symbols
+                .aux_csect(self.index.0, self.symbol.n_numaux() as usize)
+            {
+                let sym_type = aux_csect.sym_type();
+                if sym_type == xcoff::XTY_SD || sym_type == xcoff::XTY_CM {
+                    return aux_csect.x_scnlen();
+                }
+            }
+        }
+        0
+    }
+
+    fn kind(&self) -> SymbolKind {
+        if self.symbol.has_aux_csect() {
+            if let Ok(aux_csect) = self
+                .file
+                .symbols
+                .aux_csect(self.index.0, self.symbol.n_numaux() as usize)
+            {
+                let sym_type = aux_csect.sym_type();
+                if sym_type == xcoff::XTY_SD || sym_type == xcoff::XTY_CM {
+                    return match aux_csect.x_smclas() {
+                        xcoff::XMC_PR | xcoff::XMC_GL => SymbolKind::Text,
+                        xcoff::XMC_RO | xcoff::XMC_RW | xcoff::XMC_TD | xcoff::XMC_BS => {
+                            SymbolKind::Data
+                        }
+                        xcoff::XMC_TL | xcoff::XMC_UL => SymbolKind::Tls,
+                        xcoff::XMC_DS | xcoff::XMC_TC0 | xcoff::XMC_TC => {
+                            // `Metadata` might be a better kind for these if we had it.
+                            SymbolKind::Data
+                        }
+                        _ => SymbolKind::Unknown,
+                    };
+                } else if sym_type == xcoff::XTY_LD {
+                    // A function entry point. Neither `Text` nor `Label` are a good fit for this.
+                    return SymbolKind::Text;
+                } else if sym_type == xcoff::XTY_ER {
+                    return SymbolKind::Unknown;
+                }
+            }
+        }
+        match self.symbol.n_sclass() {
+            xcoff::C_NULL => SymbolKind::Null,
+            xcoff::C_FILE => SymbolKind::File,
+            _ => SymbolKind::Unknown,
+        }
+    }
+
+    fn section(&self) -> SymbolSection {
+        match self.symbol.n_scnum() {
+            xcoff::N_ABS => SymbolSection::Absolute,
+            xcoff::N_UNDEF => SymbolSection::Undefined,
+            xcoff::N_DEBUG => SymbolSection::None,
+            index if index > 0 => SymbolSection::Section(SectionIndex(index as usize)),
+            _ => SymbolSection::Unknown,
+        }
+    }
+
+    #[inline]
+    fn is_undefined(&self) -> bool {
+        self.symbol.is_undefined()
+    }
+
+    /// Return true if the symbol is a definition of a function or data object.
+    #[inline]
+    fn is_definition(&self) -> bool {
+        if self.symbol.n_scnum() <= 0 {
+            return false;
+        }
+        if self.symbol.has_aux_csect() {
+            if let Ok(aux_csect) = self
+                .symbols
+                .aux_csect(self.index.0, self.symbol.n_numaux() as usize)
+            {
+                let sym_type = aux_csect.sym_type();
+                sym_type == xcoff::XTY_SD || sym_type == xcoff::XTY_LD || sym_type == xcoff::XTY_CM
+            } else {
+                false
+            }
+        } else {
+            false
+        }
+    }
+
+    #[inline]
+    fn is_common(&self) -> bool {
+        self.symbol.n_sclass() == xcoff::C_EXT && self.symbol.n_scnum() == xcoff::N_UNDEF
+    }
+
+    #[inline]
+    fn is_weak(&self) -> bool {
+        self.symbol.n_sclass() == xcoff::C_WEAKEXT
+    }
+
+    fn scope(&self) -> SymbolScope {
+        if self.symbol.n_scnum() == xcoff::N_UNDEF {
+            SymbolScope::Unknown
+        } else {
+            match self.symbol.n_sclass() {
+                xcoff::C_EXT | xcoff::C_WEAKEXT => {
+                    let visibility = self.symbol.n_type() & xcoff::SYM_V_MASK;
+                    if visibility == xcoff::SYM_V_HIDDEN {
+                        SymbolScope::Linkage
+                    } else {
+                        SymbolScope::Dynamic
+                    }
+                }
+                _ => SymbolScope::Compilation,
+            }
+        }
+    }
+
+    #[inline]
+    fn is_global(&self) -> bool {
+        match self.symbol.n_sclass() {
+            xcoff::C_EXT | xcoff::C_WEAKEXT => true,
+            _ => false,
+        }
+    }
+
+    #[inline]
+    fn is_local(&self) -> bool {
+        !self.is_global()
+    }
+
+    #[inline]
+    fn flags(&self) -> SymbolFlags<SectionIndex, SymbolIndex> {
+        let mut x_smtyp = 0;
+        let mut x_smclas = 0;
+        let mut containing_csect = None;
+        if self.symbol.has_aux_csect() {
+            if let Ok(aux_csect) = self
+                .file
+                .symbols
+                .aux_csect(self.index.0, self.symbol.n_numaux() as usize)
+            {
+                x_smtyp = aux_csect.x_smtyp();
+                x_smclas = aux_csect.x_smclas();
+                if aux_csect.sym_type() == xcoff::XTY_LD {
+                    containing_csect = Some(SymbolIndex(aux_csect.x_scnlen() as usize))
+                }
+            }
+        }
+        SymbolFlags::Xcoff {
+            n_sclass: self.symbol.n_sclass(),
+            x_smtyp,
+            x_smclas,
+            containing_csect,
+        }
+    }
+}
+
+/// A trait for generic access to [`xcoff::Symbol32`] and [`xcoff::Symbol64`].
+#[allow(missing_docs)]
+pub trait Symbol: Debug + Pod {
+    type Word: Into<u64>;
+
+    fn n_value(&self) -> Self::Word;
+    fn n_scnum(&self) -> i16;
+    fn n_type(&self) -> u16;
+    fn n_sclass(&self) -> u8;
+    fn n_numaux(&self) -> u8;
+
+    fn name_offset(&self) -> Option<u32>;
+    fn name<'data, R: ReadRef<'data>>(
+        &'data self,
+        strings: StringTable<'data, R>,
+    ) -> Result<&'data [u8]>;
+
+    /// Return true if the symbol is undefined.
+    #[inline]
+    fn is_undefined(&self) -> bool {
+        let n_sclass = self.n_sclass();
+        (n_sclass == xcoff::C_EXT || n_sclass == xcoff::C_WEAKEXT)
+            && self.n_scnum() == xcoff::N_UNDEF
+    }
+
+    /// Return true if the symbol has file auxiliary entry.
+    fn has_aux_file(&self) -> bool {
+        self.n_numaux() > 0 && self.n_sclass() == xcoff::C_FILE
+    }
+
+    /// Return true if the symbol has csect auxiliary entry.
+    ///
+    /// A csect auxiliary entry is required for each symbol table entry that has
+    /// a storage class value of C_EXT, C_WEAKEXT, or C_HIDEXT.
+    fn has_aux_csect(&self) -> bool {
+        let sclass = self.n_sclass();
+        self.n_numaux() > 0
+            && (sclass == xcoff::C_EXT || sclass == xcoff::C_WEAKEXT || sclass == xcoff::C_HIDEXT)
+    }
+}
+
+impl Symbol for xcoff::Symbol64 {
+    type Word = u64;
+
+    fn n_value(&self) -> Self::Word {
+        self.n_value.get(BE)
+    }
+
+    fn n_scnum(&self) -> i16 {
+        self.n_scnum.get(BE)
+    }
+
+    fn n_type(&self) -> u16 {
+        self.n_type.get(BE)
+    }
+
+    fn n_sclass(&self) -> u8 {
+        self.n_sclass
+    }
+
+    fn n_numaux(&self) -> u8 {
+        self.n_numaux
+    }
+
+    fn name_offset(&self) -> Option<u32> {
+        Some(self.n_offset.get(BE))
+    }
+
+    /// Parse the symbol name for XCOFF64.
+    fn name<'data, R: ReadRef<'data>>(
+        &'data self,
+        strings: StringTable<'data, R>,
+    ) -> Result<&'data [u8]> {
+        strings
+            .get(self.n_offset.get(BE))
+            .read_error("Invalid XCOFF symbol name offset")
+    }
+}
+
+impl Symbol for xcoff::Symbol32 {
+    type Word = u32;
+
+    fn n_value(&self) -> Self::Word {
+        self.n_value.get(BE)
+    }
+
+    fn n_scnum(&self) -> i16 {
+        self.n_scnum.get(BE)
+    }
+
+    fn n_type(&self) -> u16 {
+        self.n_type.get(BE)
+    }
+
+    fn n_sclass(&self) -> u8 {
+        self.n_sclass
+    }
+
+    fn n_numaux(&self) -> u8 {
+        self.n_numaux
+    }
+
+    fn name_offset(&self) -> Option<u32> {
+        if self.n_name[0] == 0 {
+            let offset = u32::from_be_bytes(self.n_name[4..8].try_into().unwrap());
+            Some(offset)
+        } else {
+            None
+        }
+    }
+
+    /// Parse the symbol name for XCOFF32.
+    fn name<'data, R: ReadRef<'data>>(
+        &'data self,
+        strings: StringTable<'data, R>,
+    ) -> Result<&'data [u8]> {
+        if let Some(offset) = self.name_offset() {
+            // If the name starts with 0 then the last 4 bytes are a string table offset.
+            strings
+                .get(offset)
+                .read_error("Invalid XCOFF symbol name offset")
+        } else {
+            // The name is inline and padded with nulls.
+            Ok(match memchr::memchr(b'\0', &self.n_name) {
+                Some(end) => &self.n_name[..end],
+                None => &self.n_name,
+            })
+        }
+    }
+}
+
+/// A trait for generic access to [`xcoff::FileAux32`] and [`xcoff::FileAux64`].
+#[allow(missing_docs)]
+pub trait FileAux: Debug + Pod {
+    fn x_fname(&self) -> &[u8; 8];
+    fn x_ftype(&self) -> u8;
+    fn x_auxtype(&self) -> Option<u8>;
+
+    fn name_offset(&self) -> Option<u32> {
+        let x_fname = self.x_fname();
+        if x_fname[0] == 0 {
+            Some(u32::from_be_bytes(x_fname[4..8].try_into().unwrap()))
+        } else {
+            None
+        }
+    }
+
+    /// Parse the x_fname field, which may be an inline string or a string table offset.
+    fn fname<'data, R: ReadRef<'data>>(
+        &'data self,
+        strings: StringTable<'data, R>,
+    ) -> Result<&'data [u8]> {
+        if let Some(offset) = self.name_offset() {
+            // If the name starts with 0 then the last 4 bytes are a string table offset.
+            strings
+                .get(offset)
+                .read_error("Invalid XCOFF symbol name offset")
+        } else {
+            // The name is inline and padded with nulls.
+            let x_fname = self.x_fname();
+            Ok(match memchr::memchr(b'\0', x_fname) {
+                Some(end) => &x_fname[..end],
+                None => x_fname,
+            })
+        }
+    }
+}
+
+impl FileAux for xcoff::FileAux64 {
+    fn x_fname(&self) -> &[u8; 8] {
+        &self.x_fname
+    }
+
+    fn x_ftype(&self) -> u8 {
+        self.x_ftype
+    }
+
+    fn x_auxtype(&self) -> Option<u8> {
+        Some(self.x_auxtype)
+    }
+}
+
+impl FileAux for xcoff::FileAux32 {
+    fn x_fname(&self) -> &[u8; 8] {
+        &self.x_fname
+    }
+
+    fn x_ftype(&self) -> u8 {
+        self.x_ftype
+    }
+
+    fn x_auxtype(&self) -> Option<u8> {
+        None
+    }
+}
+
+/// A trait for generic access to [`xcoff::CsectAux32`] and [`xcoff::CsectAux64`].
+#[allow(missing_docs)]
+pub trait CsectAux: Debug + Pod {
+    fn x_scnlen(&self) -> u64;
+    fn x_parmhash(&self) -> u32;
+    fn x_snhash(&self) -> u16;
+    fn x_smtyp(&self) -> u8;
+    fn x_smclas(&self) -> u8;
+    fn x_stab(&self) -> Option<u32>;
+    fn x_snstab(&self) -> Option<u16>;
+    fn x_auxtype(&self) -> Option<u8>;
+
+    fn alignment(&self) -> u8 {
+        self.x_smtyp() >> 3
+    }
+    fn sym_type(&self) -> u8 {
+        self.x_smtyp() & 0x07
+    }
+}
+
+impl CsectAux for xcoff::CsectAux64 {
+    fn x_scnlen(&self) -> u64 {
+        self.x_scnlen_lo.get(BE) as u64 | ((self.x_scnlen_hi.get(BE) as u64) << 32)
+    }
+
+    fn x_parmhash(&self) -> u32 {
+        self.x_parmhash.get(BE)
+    }
+
+    fn x_snhash(&self) -> u16 {
+        self.x_snhash.get(BE)
+    }
+
+    fn x_smtyp(&self) -> u8 {
+        self.x_smtyp
+    }
+
+    fn x_smclas(&self) -> u8 {
+        self.x_smclas
+    }
+
+    fn x_stab(&self) -> Option<u32> {
+        None
+    }
+
+    fn x_snstab(&self) -> Option<u16> {
+        None
+    }
+
+    fn x_auxtype(&self) -> Option<u8> {
+        Some(self.x_auxtype)
+    }
+}
+
+impl CsectAux for xcoff::CsectAux32 {
+    fn x_scnlen(&self) -> u64 {
+        self.x_scnlen.get(BE) as u64
+    }
+
+    fn x_parmhash(&self) -> u32 {
+        self.x_parmhash.get(BE)
+    }
+
+    fn x_snhash(&self) -> u16 {
+        self.x_snhash.get(BE)
+    }
+
+    fn x_smtyp(&self) -> u8 {
+        self.x_smtyp
+    }
+
+    fn x_smclas(&self) -> u8 {
+        self.x_smclas
+    }
+
+    fn x_stab(&self) -> Option<u32> {
+        Some(self.x_stab.get(BE))
+    }
+
+    fn x_snstab(&self) -> Option<u16> {
+        Some(self.x_snstab.get(BE))
+    }
+
+    fn x_auxtype(&self) -> Option<u8> {
+        None
+    }
+}

vendor/object/src/write/coff/mod.rs

@@ -0,0 +1,10 @@
+//! Support for writing COFF files.
+//!
+//! Provides [`Writer`] for low level writing of COFF files.
+//! This is also used to provide COFF support for [`write::Object`](crate::write::Object).
+
+mod object;
+pub use self::object::*;
+
+mod writer;
+pub use writer::*;

vendor/object/src/write/coff/object.rs

@@ -0,0 +1,583 @@
+use alloc::vec::Vec;
+
+use crate::pe as coff;
+use crate::write::coff::writer;
+use crate::write::util::*;
+use crate::write::*;
+
+#[derive(Default, Clone, Copy)]
+struct SectionOffsets {
+    name: writer::Name,
+    offset: u32,
+    reloc_offset: u32,
+    selection: u8,
+    associative_section: u32,
+}
+
+#[derive(Default, Clone, Copy)]
+struct SymbolOffsets {
+    name: writer::Name,
+    index: u32,
+    aux_count: u8,
+}
+
+/// Internal format to use for the `.drectve` section containing linker
+/// directives for symbol exports.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum CoffExportStyle {
+    /// MSVC format supported by link.exe and LLD.
+    Msvc,
+    /// Gnu format supported by GNU LD and LLD.
+    Gnu,
+}
+
+impl<'a> Object<'a> {
+    pub(crate) fn coff_section_info(
+        &self,
+        section: StandardSection,
+    ) -> (&'static [u8], &'static [u8], SectionKind, SectionFlags) {
+        match section {
+            StandardSection::Text => (&[], &b".text"[..], SectionKind::Text, SectionFlags::None),
+            StandardSection::Data => (&[], &b".data"[..], SectionKind::Data, SectionFlags::None),
+            StandardSection::ReadOnlyData
+            | StandardSection::ReadOnlyDataWithRel
+            | StandardSection::ReadOnlyString => (
+                &[],
+                &b".rdata"[..],
+                SectionKind::ReadOnlyData,
+                SectionFlags::None,
+            ),
+            StandardSection::UninitializedData => (
+                &[],
+                &b".bss"[..],
+                SectionKind::UninitializedData,
+                SectionFlags::None,
+            ),
+            // TLS sections are data sections with a special name.
+            StandardSection::Tls => (&[], &b".tls$"[..], SectionKind::Data, SectionFlags::None),
+            StandardSection::UninitializedTls => {
+                // Unsupported section.
+                (&[], &[], SectionKind::UninitializedTls, SectionFlags::None)
+            }
+            StandardSection::TlsVariables => {
+                // Unsupported section.
+                (&[], &[], SectionKind::TlsVariables, SectionFlags::None)
+            }
+            StandardSection::Common => {
+                // Unsupported section.
+                (&[], &[], SectionKind::Common, SectionFlags::None)
+            }
+            StandardSection::GnuProperty => {
+                // Unsupported section.
+                (&[], &[], SectionKind::Note, SectionFlags::None)
+            }
+        }
+    }
+
+    pub(crate) fn coff_subsection_name(&self, section: &[u8], value: &[u8]) -> Vec<u8> {
+        let mut name = section.to_vec();
+        name.push(b'$');
+        name.extend_from_slice(value);
+        name
+    }
+
+    pub(crate) fn coff_fixup_relocation(&mut self, relocation: &mut Relocation) -> i64 {
+        if relocation.kind == RelocationKind::GotRelative {
+            // Use a stub symbol for the relocation instead.
+            // This isn't really a GOT, but it's a similar purpose.
+            // TODO: need to handle DLL imports differently?
+            relocation.kind = RelocationKind::Relative;
+            relocation.symbol = self.coff_add_stub_symbol(relocation.symbol);
+        } else if relocation.kind == RelocationKind::PltRelative {
+            // Windows doesn't need a separate relocation type for
+            // references to functions in import libraries.
+            // For convenience, treat this the same as Relative.
+            relocation.kind = RelocationKind::Relative;
+        }
+
+        let constant = match self.architecture {
+            Architecture::I386 | Architecture::Arm | Architecture::Aarch64 => match relocation.kind
+            {
+                RelocationKind::Relative => {
+                    // IMAGE_REL_I386_REL32, IMAGE_REL_ARM_REL32, IMAGE_REL_ARM64_REL32
+                    relocation.addend + 4
+                }
+                _ => relocation.addend,
+            },
+            Architecture::X86_64 => match relocation.kind {
+                RelocationKind::Relative => {
+                    // IMAGE_REL_AMD64_REL32 through to IMAGE_REL_AMD64_REL32_5
+                    if relocation.addend <= -4 && relocation.addend >= -9 {
+                        0
+                    } else {
+                        relocation.addend + 4
+                    }
+                }
+                _ => relocation.addend,
+            },
+            _ => unimplemented!(),
+        };
+        relocation.addend -= constant;
+        constant
+    }
+
+    fn coff_add_stub_symbol(&mut self, symbol_id: SymbolId) -> SymbolId {
+        if let Some(stub_id) = self.stub_symbols.get(&symbol_id) {
+            return *stub_id;
+        }
+        let stub_size = self.architecture.address_size().unwrap().bytes();
+
+        let name = b".rdata$.refptr".to_vec();
+        let section_id = self.add_section(Vec::new(), name, SectionKind::ReadOnlyData);
+        let section = self.section_mut(section_id);
+        section.set_data(vec![0; stub_size as usize], u64::from(stub_size));
+        section.relocations = vec![Relocation {
+            offset: 0,
+            size: stub_size * 8,
+            kind: RelocationKind::Absolute,
+            encoding: RelocationEncoding::Generic,
+            symbol: symbol_id,
+            addend: 0,
+        }];
+
+        let mut name = b".refptr.".to_vec();
+        name.extend_from_slice(&self.symbol(symbol_id).name);
+        let stub_id = self.add_raw_symbol(Symbol {
+            name,
+            value: 0,
+            size: u64::from(stub_size),
+            kind: SymbolKind::Data,
+            scope: SymbolScope::Compilation,
+            weak: false,
+            section: SymbolSection::Section(section_id),
+            flags: SymbolFlags::None,
+        });
+        self.stub_symbols.insert(symbol_id, stub_id);
+
+        stub_id
+    }
+
+    /// Appends linker directives to the `.drectve` section to tell the linker
+    /// to export all symbols with `SymbolScope::Dynamic`.
+    ///
+    /// This must be called after all symbols have been defined.
+    pub fn add_coff_exports(&mut self, style: CoffExportStyle) {
+        assert_eq!(self.format, BinaryFormat::Coff);
+
+        let mut directives = vec![];
+        for symbol in &self.symbols {
+            if symbol.scope == SymbolScope::Dynamic {
+                match style {
+                    CoffExportStyle::Msvc => directives.extend(b" /EXPORT:\""),
+                    CoffExportStyle::Gnu => directives.extend(b" -export:\""),
+                }
+                directives.extend(&symbol.name);
+                directives.extend(b"\"");
+                if symbol.kind != SymbolKind::Text {
+                    match style {
+                        CoffExportStyle::Msvc => directives.extend(b",DATA"),
+                        CoffExportStyle::Gnu => directives.extend(b",data"),
+                    }
+                }
+            }
+        }
+        let drectve = self.add_section(vec![], b".drectve".to_vec(), SectionKind::Linker);
+        self.append_section_data(drectve, &directives, 1);
+    }
+
+    pub(crate) fn coff_write(&self, buffer: &mut dyn WritableBuffer) -> Result<()> {
+        let mut writer = writer::Writer::new(buffer);
+
+        // Add section strings to strtab.
+        let mut section_offsets = vec![SectionOffsets::default(); self.sections.len()];
+        for (index, section) in self.sections.iter().enumerate() {
+            section_offsets[index].name = writer.add_name(&section.name);
+        }
+
+        // Set COMDAT flags.
+        for comdat in &self.comdats {
+            let symbol = &self.symbols[comdat.symbol.0];
+            let comdat_section = match symbol.section {
+                SymbolSection::Section(id) => id.0,
+                _ => {
+                    return Err(Error(format!(
+                        "unsupported COMDAT symbol `{}` section {:?}",
+                        symbol.name().unwrap_or(""),
+                        symbol.section
+                    )));
+                }
+            };
+            section_offsets[comdat_section].selection = match comdat.kind {
+                ComdatKind::NoDuplicates => coff::IMAGE_COMDAT_SELECT_NODUPLICATES,
+                ComdatKind::Any => coff::IMAGE_COMDAT_SELECT_ANY,
+                ComdatKind::SameSize => coff::IMAGE_COMDAT_SELECT_SAME_SIZE,
+                ComdatKind::ExactMatch => coff::IMAGE_COMDAT_SELECT_EXACT_MATCH,
+                ComdatKind::Largest => coff::IMAGE_COMDAT_SELECT_LARGEST,
+                ComdatKind::Newest => coff::IMAGE_COMDAT_SELECT_NEWEST,
+                ComdatKind::Unknown => {
+                    return Err(Error(format!(
+                        "unsupported COMDAT symbol `{}` kind {:?}",
+                        symbol.name().unwrap_or(""),
+                        comdat.kind
+                    )));
+                }
+            };
+            for id in &comdat.sections {
+                let section = &self.sections[id.0];
+                if section.symbol.is_none() {
+                    return Err(Error(format!(
+                        "missing symbol for COMDAT section `{}`",
+                        section.name().unwrap_or(""),
+                    )));
+                }
+                if id.0 != comdat_section {
+                    section_offsets[id.0].selection = coff::IMAGE_COMDAT_SELECT_ASSOCIATIVE;
+                    section_offsets[id.0].associative_section = comdat_section as u32 + 1;
+                }
+            }
+        }
+
+        // Reserve symbol indices and add symbol strings to strtab.
+        let mut symbol_offsets = vec![SymbolOffsets::default(); self.symbols.len()];
+        for (index, symbol) in self.symbols.iter().enumerate() {
+            symbol_offsets[index].index = writer.reserve_symbol_index();
+            let mut name = &*symbol.name;
+            match symbol.kind {
+                SymbolKind::File => {
+                    // Name goes in auxiliary symbol records.
+                    symbol_offsets[index].aux_count = writer.reserve_aux_file_name(&symbol.name);
+                    name = b".file";
+                }
+                SymbolKind::Section if symbol.section.id().is_some() => {
+                    symbol_offsets[index].aux_count = writer.reserve_aux_section();
+                }
+                _ => {}
+            };
+            symbol_offsets[index].name = writer.add_name(name);
+        }
+
+        // Reserve file ranges.
+        writer.reserve_file_header();
+        writer.reserve_section_headers(self.sections.len() as u16);
+        for (index, section) in self.sections.iter().enumerate() {
+            section_offsets[index].offset = writer.reserve_section(section.data.len());
+            section_offsets[index].reloc_offset =
+                writer.reserve_relocations(section.relocations.len());
+        }
+        writer.reserve_symtab_strtab();
+
+        // Start writing.
+        writer.write_file_header(writer::FileHeader {
+            machine: match (self.architecture, self.sub_architecture) {
+                (Architecture::Arm, None) => coff::IMAGE_FILE_MACHINE_ARMNT,
+                (Architecture::Aarch64, None) => coff::IMAGE_FILE_MACHINE_ARM64,
+                (Architecture::Aarch64, Some(SubArchitecture::Arm64EC)) => {
+                    coff::IMAGE_FILE_MACHINE_ARM64EC
+                }
+                (Architecture::I386, None) => coff::IMAGE_FILE_MACHINE_I386,
+                (Architecture::X86_64, None) => coff::IMAGE_FILE_MACHINE_AMD64,
+                _ => {
+                    return Err(Error(format!(
+                        "unimplemented architecture {:?} with sub-architecture {:?}",
+                        self.architecture, self.sub_architecture
+                    )));
+                }
+            },
+            time_date_stamp: 0,
+            characteristics: match self.flags {
+                FileFlags::Coff { characteristics } => characteristics,
+                _ => 0,
+            },
+        })?;
+
+        // Write section headers.
+        for (index, section) in self.sections.iter().enumerate() {
+            let mut characteristics = if let SectionFlags::Coff {
+                characteristics, ..
+            } = section.flags
+            {
+                characteristics
+            } else {
+                match section.kind {
+                    SectionKind::Text => {
+                        coff::IMAGE_SCN_CNT_CODE
+                            | coff::IMAGE_SCN_MEM_EXECUTE
+                            | coff::IMAGE_SCN_MEM_READ
+                    }
+                    SectionKind::Data => {
+                        coff::IMAGE_SCN_CNT_INITIALIZED_DATA
+                            | coff::IMAGE_SCN_MEM_READ
+                            | coff::IMAGE_SCN_MEM_WRITE
+                    }
+                    SectionKind::UninitializedData => {
+                        coff::IMAGE_SCN_CNT_UNINITIALIZED_DATA
+                            | coff::IMAGE_SCN_MEM_READ
+                            | coff::IMAGE_SCN_MEM_WRITE
+                    }
+                    SectionKind::ReadOnlyData
+                    | SectionKind::ReadOnlyDataWithRel
+                    | SectionKind::ReadOnlyString => {
+                        coff::IMAGE_SCN_CNT_INITIALIZED_DATA | coff::IMAGE_SCN_MEM_READ
+                    }
+                    SectionKind::Debug | SectionKind::Other | SectionKind::OtherString => {
+                        coff::IMAGE_SCN_CNT_INITIALIZED_DATA
+                            | coff::IMAGE_SCN_MEM_READ
+                            | coff::IMAGE_SCN_MEM_DISCARDABLE
+                    }
+                    SectionKind::Linker => coff::IMAGE_SCN_LNK_INFO | coff::IMAGE_SCN_LNK_REMOVE,
+                    SectionKind::Common
+                    | SectionKind::Tls
+                    | SectionKind::UninitializedTls
+                    | SectionKind::TlsVariables
+                    | SectionKind::Note
+                    | SectionKind::Unknown
+                    | SectionKind::Metadata
+                    | SectionKind::Elf(_) => {
+                        return Err(Error(format!(
+                            "unimplemented section `{}` kind {:?}",
+                            section.name().unwrap_or(""),
+                            section.kind
+                        )));
+                    }
+                }
+            };
+            if section_offsets[index].selection != 0 {
+                characteristics |= coff::IMAGE_SCN_LNK_COMDAT;
+            };
+            if section.relocations.len() > 0xffff {
+                characteristics |= coff::IMAGE_SCN_LNK_NRELOC_OVFL;
+            }
+            characteristics |= match section.align {
+                1 => coff::IMAGE_SCN_ALIGN_1BYTES,
+                2 => coff::IMAGE_SCN_ALIGN_2BYTES,
+                4 => coff::IMAGE_SCN_ALIGN_4BYTES,
+                8 => coff::IMAGE_SCN_ALIGN_8BYTES,
+                16 => coff::IMAGE_SCN_ALIGN_16BYTES,
+                32 => coff::IMAGE_SCN_ALIGN_32BYTES,
+                64 => coff::IMAGE_SCN_ALIGN_64BYTES,
+                128 => coff::IMAGE_SCN_ALIGN_128BYTES,
+                256 => coff::IMAGE_SCN_ALIGN_256BYTES,
+                512 => coff::IMAGE_SCN_ALIGN_512BYTES,
+                1024 => coff::IMAGE_SCN_ALIGN_1024BYTES,
+                2048 => coff::IMAGE_SCN_ALIGN_2048BYTES,
+                4096 => coff::IMAGE_SCN_ALIGN_4096BYTES,
+                8192 => coff::IMAGE_SCN_ALIGN_8192BYTES,
+                _ => {
+                    return Err(Error(format!(
+                        "unimplemented section `{}` align {}",
+                        section.name().unwrap_or(""),
+                        section.align
+                    )));
+                }
+            };
+            writer.write_section_header(writer::SectionHeader {
+                name: section_offsets[index].name,
+                size_of_raw_data: section.size as u32,
+                pointer_to_raw_data: section_offsets[index].offset,
+                pointer_to_relocations: section_offsets[index].reloc_offset,
+                pointer_to_linenumbers: 0,
+                number_of_relocations: section.relocations.len() as u32,
+                number_of_linenumbers: 0,
+                characteristics,
+            });
+        }
+
+        // Write section data and relocations.
+        for section in &self.sections {
+            writer.write_section(&section.data);
+
+            if !section.relocations.is_empty() {
+                //debug_assert_eq!(section_offsets[index].reloc_offset, buffer.len());
+                writer.write_relocations_count(section.relocations.len());
+                for reloc in &section.relocations {
+                    //assert!(reloc.implicit_addend);
+                    let typ = match self.architecture {
+                        Architecture::I386 => match (reloc.kind, reloc.size, reloc.addend) {
+                            (RelocationKind::Absolute, 16, 0) => coff::IMAGE_REL_I386_DIR16,
+                            (RelocationKind::Relative, 16, 0) => coff::IMAGE_REL_I386_REL16,
+                            (RelocationKind::Absolute, 32, 0) => coff::IMAGE_REL_I386_DIR32,
+                            (RelocationKind::ImageOffset, 32, 0) => coff::IMAGE_REL_I386_DIR32NB,
+                            (RelocationKind::SectionIndex, 16, 0) => coff::IMAGE_REL_I386_SECTION,
+                            (RelocationKind::SectionOffset, 32, 0) => coff::IMAGE_REL_I386_SECREL,
+                            (RelocationKind::SectionOffset, 7, 0) => coff::IMAGE_REL_I386_SECREL7,
+                            (RelocationKind::Relative, 32, -4) => coff::IMAGE_REL_I386_REL32,
+                            (RelocationKind::Coff(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::X86_64 => match (reloc.kind, reloc.size, reloc.addend) {
+                            (RelocationKind::Absolute, 64, 0) => coff::IMAGE_REL_AMD64_ADDR64,
+                            (RelocationKind::Absolute, 32, 0) => coff::IMAGE_REL_AMD64_ADDR32,
+                            (RelocationKind::ImageOffset, 32, 0) => coff::IMAGE_REL_AMD64_ADDR32NB,
+                            (RelocationKind::Relative, 32, -4) => coff::IMAGE_REL_AMD64_REL32,
+                            (RelocationKind::Relative, 32, -5) => coff::IMAGE_REL_AMD64_REL32_1,
+                            (RelocationKind::Relative, 32, -6) => coff::IMAGE_REL_AMD64_REL32_2,
+                            (RelocationKind::Relative, 32, -7) => coff::IMAGE_REL_AMD64_REL32_3,
+                            (RelocationKind::Relative, 32, -8) => coff::IMAGE_REL_AMD64_REL32_4,
+                            (RelocationKind::Relative, 32, -9) => coff::IMAGE_REL_AMD64_REL32_5,
+                            (RelocationKind::SectionIndex, 16, 0) => coff::IMAGE_REL_AMD64_SECTION,
+                            (RelocationKind::SectionOffset, 32, 0) => coff::IMAGE_REL_AMD64_SECREL,
+                            (RelocationKind::SectionOffset, 7, 0) => coff::IMAGE_REL_AMD64_SECREL7,
+                            (RelocationKind::Coff(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::Arm => match (reloc.kind, reloc.size, reloc.addend) {
+                            (RelocationKind::Absolute, 32, 0) => coff::IMAGE_REL_ARM_ADDR32,
+                            (RelocationKind::ImageOffset, 32, 0) => coff::IMAGE_REL_ARM_ADDR32NB,
+                            (RelocationKind::Relative, 32, -4) => coff::IMAGE_REL_ARM_REL32,
+                            (RelocationKind::SectionIndex, 16, 0) => coff::IMAGE_REL_ARM_SECTION,
+                            (RelocationKind::SectionOffset, 32, 0) => coff::IMAGE_REL_ARM_SECREL,
+                            (RelocationKind::Coff(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::Aarch64 => match (reloc.kind, reloc.size, reloc.addend) {
+                            (RelocationKind::Absolute, 32, 0) => coff::IMAGE_REL_ARM64_ADDR32,
+                            (RelocationKind::ImageOffset, 32, 0) => coff::IMAGE_REL_ARM64_ADDR32NB,
+                            (RelocationKind::SectionIndex, 16, 0) => coff::IMAGE_REL_ARM64_SECTION,
+                            (RelocationKind::SectionOffset, 32, 0) => coff::IMAGE_REL_ARM64_SECREL,
+                            (RelocationKind::Absolute, 64, 0) => coff::IMAGE_REL_ARM64_ADDR64,
+                            (RelocationKind::Relative, 32, -4) => coff::IMAGE_REL_ARM64_REL32,
+                            (RelocationKind::Coff(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        _ => {
+                            return Err(Error(format!(
+                                "unimplemented architecture {:?}",
+                                self.architecture
+                            )));
+                        }
+                    };
+                    writer.write_relocation(writer::Relocation {
+                        virtual_address: reloc.offset as u32,
+                        symbol: symbol_offsets[reloc.symbol.0].index,
+                        typ,
+                    });
+                }
+            }
+        }
+
+        // Write symbols.
+        for (index, symbol) in self.symbols.iter().enumerate() {
+            let section_number = match symbol.section {
+                SymbolSection::None => {
+                    debug_assert_eq!(symbol.kind, SymbolKind::File);
+                    coff::IMAGE_SYM_DEBUG as u16
+                }
+                SymbolSection::Undefined => coff::IMAGE_SYM_UNDEFINED as u16,
+                SymbolSection::Absolute => coff::IMAGE_SYM_ABSOLUTE as u16,
+                SymbolSection::Common => coff::IMAGE_SYM_UNDEFINED as u16,
+                SymbolSection::Section(id) => id.0 as u16 + 1,
+            };
+            let typ = if symbol.kind == SymbolKind::Text {
+                coff::IMAGE_SYM_DTYPE_FUNCTION << coff::IMAGE_SYM_DTYPE_SHIFT
+            } else {
+                coff::IMAGE_SYM_TYPE_NULL
+            };
+            let storage_class = match symbol.kind {
+                SymbolKind::File => coff::IMAGE_SYM_CLASS_FILE,
+                SymbolKind::Section => {
+                    if symbol.section.id().is_some() {
+                        coff::IMAGE_SYM_CLASS_STATIC
+                    } else {
+                        coff::IMAGE_SYM_CLASS_SECTION
+                    }
+                }
+                SymbolKind::Label => coff::IMAGE_SYM_CLASS_LABEL,
+                SymbolKind::Text | SymbolKind::Data | SymbolKind::Tls => {
+                    match symbol.section {
+                        SymbolSection::None => {
+                            return Err(Error(format!(
+                                "missing section for symbol `{}`",
+                                symbol.name().unwrap_or("")
+                            )));
+                        }
+                        SymbolSection::Undefined | SymbolSection::Common => {
+                            coff::IMAGE_SYM_CLASS_EXTERNAL
+                        }
+                        SymbolSection::Absolute | SymbolSection::Section(_) => {
+                            match symbol.scope {
+                                // TODO: does this need aux symbol records too?
+                                _ if symbol.weak => coff::IMAGE_SYM_CLASS_WEAK_EXTERNAL,
+                                SymbolScope::Unknown => {
+                                    return Err(Error(format!(
+                                        "unimplemented symbol `{}` scope {:?}",
+                                        symbol.name().unwrap_or(""),
+                                        symbol.scope
+                                    )));
+                                }
+                                SymbolScope::Compilation => coff::IMAGE_SYM_CLASS_STATIC,
+                                SymbolScope::Linkage | SymbolScope::Dynamic => {
+                                    coff::IMAGE_SYM_CLASS_EXTERNAL
+                                }
+                            }
+                        }
+                    }
+                }
+                SymbolKind::Unknown | SymbolKind::Null => {
+                    return Err(Error(format!(
+                        "unimplemented symbol `{}` kind {:?}",
+                        symbol.name().unwrap_or(""),
+                        symbol.kind
+                    )));
+                }
+            };
+            let number_of_aux_symbols = symbol_offsets[index].aux_count;
+            let value = if symbol.section == SymbolSection::Common {
+                symbol.size as u32
+            } else {
+                symbol.value as u32
+            };
+            writer.write_symbol(writer::Symbol {
+                name: symbol_offsets[index].name,
+                value,
+                section_number,
+                typ,
+                storage_class,
+                number_of_aux_symbols,
+            });
+
+            // Write auxiliary symbols.
+            match symbol.kind {
+                SymbolKind::File => {
+                    writer.write_aux_file_name(&symbol.name, number_of_aux_symbols);
+                }
+                SymbolKind::Section if symbol.section.id().is_some() => {
+                    debug_assert_eq!(number_of_aux_symbols, 1);
+                    let section_index = symbol.section.id().unwrap().0;
+                    let section = &self.sections[section_index];
+                    writer.write_aux_section(writer::AuxSymbolSection {
+                        length: section.size as u32,
+                        number_of_relocations: section.relocations.len() as u32,
+                        number_of_linenumbers: 0,
+                        check_sum: checksum(section.data()),
+                        number: section_offsets[section_index].associative_section,
+                        selection: section_offsets[section_index].selection,
+                    });
+                }
+                _ => {
+                    debug_assert_eq!(number_of_aux_symbols, 0);
+                }
+            }
+        }
+
+        writer.write_strtab();
+
+        debug_assert_eq!(writer.reserved_len(), writer.len());
+
+        Ok(())
+    }
+}
+
+// JamCRC
+fn checksum(data: &[u8]) -> u32 {
+    let mut hasher = crc32fast::Hasher::new_with_initial(0xffff_ffff);
+    hasher.update(data);
+    !hasher.finalize()
+}

vendor/object/src/write/coff/writer.rs

@@ -0,0 +1,518 @@
+//! Helper for writing COFF files.
+use alloc::string::String;
+use alloc::vec::Vec;
+use core::mem;
+
+use crate::endian::{LittleEndian as LE, U16Bytes, U32Bytes, U16, U32};
+use crate::pe;
+use crate::write::string::{StringId, StringTable};
+use crate::write::util;
+use crate::write::{Error, Result, WritableBuffer};
+
+/// A helper for writing COFF files.
+///
+/// Writing uses a two phase approach. The first phase builds up all of the information
+/// that may need to be known ahead of time:
+/// - build string table
+/// - reserve section indices
+/// - reserve symbol indices
+/// - reserve file ranges for headers and sections
+///
+/// Some of the information has ordering requirements. For example, strings must be added
+/// to the string table before reserving the file range for the string table. There are debug
+/// asserts to check some of these requirements.
+///
+/// The second phase writes everything out in order. Thus the caller must ensure writing
+/// is in the same order that file ranges were reserved. There are debug asserts to assist
+/// with checking this.
+#[allow(missing_debug_implementations)]
+pub struct Writer<'a> {
+    buffer: &'a mut dyn WritableBuffer,
+    len: usize,
+
+    section_num: u16,
+
+    symtab_offset: u32,
+    symtab_num: u32,
+
+    strtab: StringTable<'a>,
+    strtab_len: usize,
+    strtab_offset: u32,
+    strtab_data: Vec<u8>,
+}
+
+impl<'a> Writer<'a> {
+    /// Create a new `Writer`.
+    pub fn new(buffer: &'a mut dyn WritableBuffer) -> Self {
+        Writer {
+            buffer,
+            len: 0,
+
+            section_num: 0,
+
+            symtab_offset: 0,
+            symtab_num: 0,
+
+            strtab: StringTable::default(),
+            strtab_len: 0,
+            strtab_offset: 0,
+            strtab_data: Vec::new(),
+        }
+    }
+
+    /// Return the current file length that has been reserved.
+    pub fn reserved_len(&self) -> usize {
+        self.len
+    }
+
+    /// Return the current file length that has been written.
+    #[allow(clippy::len_without_is_empty)]
+    pub fn len(&self) -> usize {
+        self.buffer.len()
+    }
+
+    /// Reserve a file range with the given size and starting alignment.
+    ///
+    /// Returns the aligned offset of the start of the range.
+    pub fn reserve(&mut self, len: usize, align_start: usize) -> u32 {
+        if align_start > 1 {
+            self.len = util::align(self.len, align_start);
+        }
+        let offset = self.len;
+        self.len += len;
+        offset as u32
+    }
+
+    /// Write alignment padding bytes.
+    pub fn write_align(&mut self, align_start: usize) {
+        if align_start > 1 {
+            util::write_align(self.buffer, align_start);
+        }
+    }
+
+    /// Write data.
+    pub fn write(&mut self, data: &[u8]) {
+        self.buffer.write_bytes(data);
+    }
+
+    /// Reserve the file range up to the given file offset.
+    pub fn reserve_until(&mut self, offset: usize) {
+        debug_assert!(self.len <= offset);
+        self.len = offset;
+    }
+
+    /// Write padding up to the given file offset.
+    pub fn pad_until(&mut self, offset: usize) {
+        debug_assert!(self.buffer.len() <= offset);
+        self.buffer.resize(offset);
+    }
+
+    /// Reserve the range for the file header.
+    ///
+    /// This must be at the start of the file.
+    pub fn reserve_file_header(&mut self) {
+        debug_assert_eq!(self.len, 0);
+        self.reserve(mem::size_of::<pe::ImageFileHeader>(), 1);
+    }
+
+    /// Write the file header.
+    ///
+    /// This must be at the start of the file.
+    ///
+    /// Fields that can be derived from known information are automatically set by this function.
+    pub fn write_file_header(&mut self, header: FileHeader) -> Result<()> {
+        debug_assert_eq!(self.buffer.len(), 0);
+
+        // Start writing.
+        self.buffer
+            .reserve(self.len)
+            .map_err(|_| Error(String::from("Cannot allocate buffer")))?;
+
+        // Write file header.
+        let header = pe::ImageFileHeader {
+            machine: U16::new(LE, header.machine),
+            number_of_sections: U16::new(LE, self.section_num),
+            time_date_stamp: U32::new(LE, header.time_date_stamp),
+            pointer_to_symbol_table: U32::new(LE, self.symtab_offset),
+            number_of_symbols: U32::new(LE, self.symtab_num),
+            size_of_optional_header: U16::default(),
+            characteristics: U16::new(LE, header.characteristics),
+        };
+        self.buffer.write(&header);
+
+        Ok(())
+    }
+
+    /// Reserve the range for the section headers.
+    pub fn reserve_section_headers(&mut self, section_num: u16) {
+        debug_assert_eq!(self.section_num, 0);
+        self.section_num = section_num;
+        self.reserve(
+            section_num as usize * mem::size_of::<pe::ImageSectionHeader>(),
+            1,
+        );
+    }
+
+    /// Write a section header.
+    pub fn write_section_header(&mut self, section: SectionHeader) {
+        let mut coff_section = pe::ImageSectionHeader {
+            name: [0; 8],
+            virtual_size: U32::default(),
+            virtual_address: U32::default(),
+            size_of_raw_data: U32::new(LE, section.size_of_raw_data),
+            pointer_to_raw_data: U32::new(LE, section.pointer_to_raw_data),
+            pointer_to_relocations: U32::new(LE, section.pointer_to_relocations),
+            pointer_to_linenumbers: U32::new(LE, section.pointer_to_linenumbers),
+            number_of_relocations: if section.number_of_relocations > 0xffff {
+                U16::new(LE, 0xffff)
+            } else {
+                U16::new(LE, section.number_of_relocations as u16)
+            },
+            number_of_linenumbers: U16::default(),
+            characteristics: U32::new(LE, section.characteristics),
+        };
+        match section.name {
+            Name::Short(name) => coff_section.name = name,
+            Name::Long(str_id) => {
+                let mut str_offset = self.strtab.get_offset(str_id);
+                if str_offset <= 9_999_999 {
+                    let mut name = [0; 7];
+                    let mut len = 0;
+                    if str_offset == 0 {
+                        name[6] = b'0';
+                        len = 1;
+                    } else {
+                        while str_offset != 0 {
+                            let rem = (str_offset % 10) as u8;
+                            str_offset /= 10;
+                            name[6 - len] = b'0' + rem;
+                            len += 1;
+                        }
+                    }
+                    coff_section.name = [0; 8];
+                    coff_section.name[0] = b'/';
+                    coff_section.name[1..][..len].copy_from_slice(&name[7 - len..]);
+                } else {
+                    debug_assert!(str_offset as u64 <= 0xf_ffff_ffff);
+                    coff_section.name[0] = b'/';
+                    coff_section.name[1] = b'/';
+                    for i in 0..6 {
+                        let rem = (str_offset % 64) as u8;
+                        str_offset /= 64;
+                        let c = match rem {
+                            0..=25 => b'A' + rem,
+                            26..=51 => b'a' + rem - 26,
+                            52..=61 => b'0' + rem - 52,
+                            62 => b'+',
+                            63 => b'/',
+                            _ => unreachable!(),
+                        };
+                        coff_section.name[7 - i] = c;
+                    }
+                }
+            }
+        }
+        self.buffer.write(&coff_section);
+    }
+
+    /// Reserve the range for the section data.
+    ///
+    /// Returns the aligned offset of the start of the range.
+    /// Does nothing and returns 0 if the length is zero.
+    pub fn reserve_section(&mut self, len: usize) -> u32 {
+        if len == 0 {
+            return 0;
+        }
+        // TODO: not sure what alignment is required here, but this seems to match LLVM
+        self.reserve(len, 4)
+    }
+
+    /// Write the alignment bytes prior to section data.
+    ///
+    /// This is unneeded if you are using `write_section` or `write_section_zeroes`
+    /// for the data.
+    pub fn write_section_align(&mut self) {
+        util::write_align(self.buffer, 4);
+    }
+
+    /// Write the section data.
+    ///
+    /// Writes alignment bytes prior to the data.
+    /// Does nothing if the data is empty.
+    pub fn write_section(&mut self, data: &[u8]) {
+        if data.is_empty() {
+            return;
+        }
+        self.write_section_align();
+        self.buffer.write_bytes(data);
+    }
+
+    /// Write the section data using zero bytes.
+    ///
+    /// Writes alignment bytes prior to the data.
+    /// Does nothing if the length is zero.
+    pub fn write_section_zeroes(&mut self, len: usize) {
+        if len == 0 {
+            return;
+        }
+        self.write_section_align();
+        self.buffer.resize(self.buffer.len() + len);
+    }
+
+    /// Reserve a file range for the given number of relocations.
+    ///
+    /// This will automatically reserve an extra relocation if there are more than 0xffff.
+    ///
+    /// Returns the offset of the range.
+    /// Does nothing and returns 0 if the count is zero.
+    pub fn reserve_relocations(&mut self, mut count: usize) -> u32 {
+        if count == 0 {
+            return 0;
+        }
+        if count > 0xffff {
+            count += 1;
+        }
+        self.reserve(count * mem::size_of::<pe::ImageRelocation>(), 1)
+    }
+
+    /// Write a relocation containing the count if required.
+    ///
+    /// This should be called before writing the first relocation for a section.
+    pub fn write_relocations_count(&mut self, count: usize) {
+        if count > 0xffff {
+            let coff_relocation = pe::ImageRelocation {
+                virtual_address: U32Bytes::new(LE, count as u32 + 1),
+                symbol_table_index: U32Bytes::new(LE, 0),
+                typ: U16Bytes::new(LE, 0),
+            };
+            self.buffer.write(&coff_relocation);
+        }
+    }
+
+    /// Write a relocation.
+    pub fn write_relocation(&mut self, reloc: Relocation) {
+        let coff_relocation = pe::ImageRelocation {
+            virtual_address: U32Bytes::new(LE, reloc.virtual_address),
+            symbol_table_index: U32Bytes::new(LE, reloc.symbol),
+            typ: U16Bytes::new(LE, reloc.typ),
+        };
+        self.buffer.write(&coff_relocation);
+    }
+
+    /// Reserve a symbol table entry.
+    ///
+    /// This must be called before [`Self::reserve_symtab_strtab`].
+    pub fn reserve_symbol_index(&mut self) -> u32 {
+        debug_assert_eq!(self.symtab_offset, 0);
+        let index = self.symtab_num;
+        self.symtab_num += 1;
+        index
+    }
+
+    /// Reserve a number of symbol table entries.
+    pub fn reserve_symbol_indices(&mut self, count: u32) {
+        debug_assert_eq!(self.symtab_offset, 0);
+        self.symtab_num += count;
+    }
+
+    /// Write a symbol table entry.
+    pub fn write_symbol(&mut self, symbol: Symbol) {
+        let mut coff_symbol = pe::ImageSymbol {
+            name: [0; 8],
+            value: U32Bytes::new(LE, symbol.value),
+            section_number: U16Bytes::new(LE, symbol.section_number),
+            typ: U16Bytes::new(LE, symbol.typ),
+            storage_class: symbol.storage_class,
+            number_of_aux_symbols: symbol.number_of_aux_symbols,
+        };
+        match symbol.name {
+            Name::Short(name) => coff_symbol.name = name,
+            Name::Long(str_id) => {
+                let str_offset = self.strtab.get_offset(str_id);
+                coff_symbol.name[4..8].copy_from_slice(&u32::to_le_bytes(str_offset as u32));
+            }
+        }
+        self.buffer.write(&coff_symbol);
+    }
+
+    /// Reserve auxiliary symbols for a file name.
+    ///
+    /// Returns the number of auxiliary symbols required.
+    ///
+    /// This must be called before [`Self::reserve_symtab_strtab`].
+    pub fn reserve_aux_file_name(&mut self, name: &[u8]) -> u8 {
+        debug_assert_eq!(self.symtab_offset, 0);
+        let aux_count = (name.len() + pe::IMAGE_SIZEOF_SYMBOL - 1) / pe::IMAGE_SIZEOF_SYMBOL;
+        self.symtab_num += aux_count as u32;
+        aux_count as u8
+    }
+
+    /// Write auxiliary symbols for a file name.
+    pub fn write_aux_file_name(&mut self, name: &[u8], aux_count: u8) {
+        let aux_len = aux_count as usize * pe::IMAGE_SIZEOF_SYMBOL;
+        debug_assert!(aux_len >= name.len());
+        let old_len = self.buffer.len();
+        self.buffer.write_bytes(name);
+        self.buffer.resize(old_len + aux_len);
+    }
+
+    /// Reserve an auxiliary symbol for a section.
+    ///
+    /// Returns the number of auxiliary symbols required.
+    ///
+    /// This must be called before [`Self::reserve_symtab_strtab`].
+    pub fn reserve_aux_section(&mut self) -> u8 {
+        debug_assert_eq!(self.symtab_offset, 0);
+        self.symtab_num += 1;
+        1
+    }
+
+    /// Write an auxiliary symbol for a section.
+    pub fn write_aux_section(&mut self, section: AuxSymbolSection) {
+        let aux = pe::ImageAuxSymbolSection {
+            length: U32Bytes::new(LE, section.length),
+            number_of_relocations: if section.number_of_relocations > 0xffff {
+                U16Bytes::new(LE, 0xffff)
+            } else {
+                U16Bytes::new(LE, section.number_of_relocations as u16)
+            },
+            number_of_linenumbers: U16Bytes::new(LE, section.number_of_linenumbers),
+            check_sum: U32Bytes::new(LE, section.check_sum),
+            number: U16Bytes::new(LE, section.number as u16),
+            selection: section.selection,
+            reserved: 0,
+            high_number: U16Bytes::new(LE, (section.number >> 16) as u16),
+        };
+        self.buffer.write(&aux);
+    }
+
+    /// Return the number of reserved symbol table entries.
+    pub fn symbol_count(&self) -> u32 {
+        self.symtab_num
+    }
+
+    /// Add a string to the string table.
+    ///
+    /// This must be called before [`Self::reserve_symtab_strtab`].
+    pub fn add_string(&mut self, name: &'a [u8]) -> StringId {
+        debug_assert_eq!(self.strtab_offset, 0);
+        self.strtab.add(name)
+    }
+
+    /// Add a section or symbol name to the string table if required.
+    ///
+    /// This must be called before [`Self::reserve_symtab_strtab`].
+    pub fn add_name(&mut self, name: &'a [u8]) -> Name {
+        if name.len() > 8 {
+            Name::Long(self.add_string(name))
+        } else {
+            let mut short_name = [0; 8];
+            short_name[..name.len()].copy_from_slice(name);
+            Name::Short(short_name)
+        }
+    }
+
+    /// Reserve the range for the symbol table and string table.
+    ///
+    /// This must be called after functions that reserve symbol
+    /// indices or add strings.
+    pub fn reserve_symtab_strtab(&mut self) {
+        debug_assert_eq!(self.symtab_offset, 0);
+        self.symtab_offset = self.reserve(self.symtab_num as usize * pe::IMAGE_SIZEOF_SYMBOL, 1);
+
+        debug_assert_eq!(self.strtab_offset, 0);
+        // First 4 bytes of strtab are the length.
+        self.strtab.write(4, &mut self.strtab_data);
+        self.strtab_len = self.strtab_data.len() + 4;
+        self.strtab_offset = self.reserve(self.strtab_len, 1);
+    }
+
+    /// Write the string table.
+    pub fn write_strtab(&mut self) {
+        debug_assert_eq!(self.strtab_offset, self.buffer.len() as u32);
+        self.buffer
+            .write_bytes(&u32::to_le_bytes(self.strtab_len as u32));
+        self.buffer.write_bytes(&self.strtab_data);
+    }
+}
+
+/// Shortened and native endian version of [`pe::ImageFileHeader`].
+#[allow(missing_docs)]
+#[derive(Debug, Default, Clone)]
+pub struct FileHeader {
+    pub machine: u16,
+    pub time_date_stamp: u32,
+    pub characteristics: u16,
+}
+
+/// A section or symbol name.
+#[derive(Debug, Clone, Copy)]
+pub enum Name {
+    /// An inline name.
+    Short([u8; 8]),
+    /// An id of a string table entry.
+    Long(StringId),
+}
+
+impl Default for Name {
+    fn default() -> Name {
+        Name::Short([0; 8])
+    }
+}
+
+// From isn't useful.
+#[allow(clippy::from_over_into)]
+impl<'a> Into<Name> for &'a [u8; 8] {
+    fn into(self) -> Name {
+        Name::Short(*self)
+    }
+}
+
+/// Native endian version of [`pe::ImageSectionHeader`].
+#[allow(missing_docs)]
+#[derive(Debug, Default, Clone)]
+pub struct SectionHeader {
+    pub name: Name,
+    pub size_of_raw_data: u32,
+    pub pointer_to_raw_data: u32,
+    pub pointer_to_relocations: u32,
+    pub pointer_to_linenumbers: u32,
+    /// This will automatically be clamped if there are more than 0xffff.
+    pub number_of_relocations: u32,
+    pub number_of_linenumbers: u16,
+    pub characteristics: u32,
+}
+
+/// Native endian version of [`pe::ImageSymbol`].
+#[allow(missing_docs)]
+#[derive(Debug, Default, Clone)]
+pub struct Symbol {
+    pub name: Name,
+    pub value: u32,
+    pub section_number: u16,
+    pub typ: u16,
+    pub storage_class: u8,
+    pub number_of_aux_symbols: u8,
+}
+
+/// Native endian version of [`pe::ImageAuxSymbolSection`].
+#[allow(missing_docs)]
+#[derive(Debug, Default, Clone)]
+pub struct AuxSymbolSection {
+    pub length: u32,
+    /// This will automatically be clamped if there are more than 0xffff.
+    pub number_of_relocations: u32,
+    pub number_of_linenumbers: u16,
+    pub check_sum: u32,
+    pub number: u32,
+    pub selection: u8,
+}
+
+/// Native endian version of [`pe::ImageRelocation`].
+#[allow(missing_docs)]
+#[derive(Debug, Default, Clone)]
+pub struct Relocation {
+    pub virtual_address: u32,
+    pub symbol: u32,
+    pub typ: u16,
+}

vendor/object/src/write/elf/mod.rs

@@ -0,0 +1,9 @@
+//! Support for writing ELF files.
+//!
+//! Provides [`Writer`] for low level writing of ELF files.
+//! This is also used to provide ELF support for [`write::Object`](crate::write::Object).
+
+mod object;
+
+mod writer;
+pub use writer::*;

vendor/object/src/write/elf/object.rs

@@ -0,0 +1,907 @@
+use alloc::vec::Vec;
+
+use crate::write::elf::writer::*;
+use crate::write::string::StringId;
+use crate::write::*;
+use crate::AddressSize;
+use crate::{elf, pod};
+
+#[derive(Clone, Copy)]
+struct ComdatOffsets {
+    offset: usize,
+    str_id: StringId,
+}
+
+#[derive(Clone, Copy)]
+struct SectionOffsets {
+    index: SectionIndex,
+    offset: usize,
+    str_id: StringId,
+    reloc_offset: usize,
+    reloc_str_id: Option<StringId>,
+}
+
+#[derive(Default, Clone, Copy)]
+struct SymbolOffsets {
+    index: SymbolIndex,
+    str_id: Option<StringId>,
+}
+
+// Public methods.
+impl<'a> Object<'a> {
+    /// Add a property with a u32 value to the ELF ".note.gnu.property" section.
+    ///
+    /// Requires `feature = "elf"`.
+    pub fn add_elf_gnu_property_u32(&mut self, property: u32, value: u32) {
+        if self.format != BinaryFormat::Elf {
+            return;
+        }
+
+        let align = if self.elf_is_64() { 8 } else { 4 };
+        let mut data = Vec::with_capacity(32);
+        let n_name = b"GNU\0";
+        data.extend_from_slice(pod::bytes_of(&elf::NoteHeader32 {
+            n_namesz: U32::new(self.endian, n_name.len() as u32),
+            n_descsz: U32::new(self.endian, util::align(3 * 4, align) as u32),
+            n_type: U32::new(self.endian, elf::NT_GNU_PROPERTY_TYPE_0),
+        }));
+        data.extend_from_slice(n_name);
+        // This happens to already be aligned correctly.
+        debug_assert_eq!(util::align(data.len(), align), data.len());
+        data.extend_from_slice(pod::bytes_of(&U32::new(self.endian, property)));
+        // Value size
+        data.extend_from_slice(pod::bytes_of(&U32::new(self.endian, 4)));
+        data.extend_from_slice(pod::bytes_of(&U32::new(self.endian, value)));
+        util::write_align(&mut data, align);
+
+        let section = self.section_id(StandardSection::GnuProperty);
+        self.append_section_data(section, &data, align as u64);
+    }
+}
+
+// Private methods.
+impl<'a> Object<'a> {
+    pub(crate) fn elf_section_info(
+        &self,
+        section: StandardSection,
+    ) -> (&'static [u8], &'static [u8], SectionKind, SectionFlags) {
+        match section {
+            StandardSection::Text => (&[], &b".text"[..], SectionKind::Text, SectionFlags::None),
+            StandardSection::Data => (&[], &b".data"[..], SectionKind::Data, SectionFlags::None),
+            StandardSection::ReadOnlyData | StandardSection::ReadOnlyString => (
+                &[],
+                &b".rodata"[..],
+                SectionKind::ReadOnlyData,
+                SectionFlags::None,
+            ),
+            StandardSection::ReadOnlyDataWithRel => (
+                &[],
+                b".data.rel.ro",
+                SectionKind::ReadOnlyDataWithRel,
+                SectionFlags::None,
+            ),
+            StandardSection::UninitializedData => (
+                &[],
+                &b".bss"[..],
+                SectionKind::UninitializedData,
+                SectionFlags::None,
+            ),
+            StandardSection::Tls => (&[], &b".tdata"[..], SectionKind::Tls, SectionFlags::None),
+            StandardSection::UninitializedTls => (
+                &[],
+                &b".tbss"[..],
+                SectionKind::UninitializedTls,
+                SectionFlags::None,
+            ),
+            StandardSection::TlsVariables => {
+                // Unsupported section.
+                (&[], &[], SectionKind::TlsVariables, SectionFlags::None)
+            }
+            StandardSection::Common => {
+                // Unsupported section.
+                (&[], &[], SectionKind::Common, SectionFlags::None)
+            }
+            StandardSection::GnuProperty => (
+                &[],
+                &b".note.gnu.property"[..],
+                SectionKind::Note,
+                SectionFlags::Elf {
+                    sh_flags: u64::from(elf::SHF_ALLOC),
+                },
+            ),
+        }
+    }
+
+    pub(crate) fn elf_subsection_name(&self, section: &[u8], value: &[u8]) -> Vec<u8> {
+        let mut name = section.to_vec();
+        name.push(b'.');
+        name.extend_from_slice(value);
+        name
+    }
+
+    fn elf_has_relocation_addend(&self) -> Result<bool> {
+        Ok(match self.architecture {
+            Architecture::Aarch64 => true,
+            Architecture::Aarch64_Ilp32 => true,
+            Architecture::Arm => false,
+            Architecture::Avr => true,
+            Architecture::Bpf => false,
+            Architecture::Csky => true,
+            Architecture::I386 => false,
+            Architecture::X86_64 => true,
+            Architecture::X86_64_X32 => true,
+            Architecture::Hexagon => true,
+            Architecture::LoongArch64 => true,
+            Architecture::Mips => false,
+            Architecture::Mips64 => true,
+            Architecture::Msp430 => true,
+            Architecture::PowerPc => true,
+            Architecture::PowerPc64 => true,
+            Architecture::Riscv64 => true,
+            Architecture::Riscv32 => true,
+            Architecture::S390x => true,
+            Architecture::Sbf => false,
+            Architecture::Sharc => true,
+            Architecture::Sparc64 => true,
+            Architecture::Xtensa => true,
+            _ => {
+                return Err(Error(format!(
+                    "unimplemented architecture {:?}",
+                    self.architecture
+                )));
+            }
+        })
+    }
+
+    pub(crate) fn elf_fixup_relocation(&mut self, relocation: &mut Relocation) -> Result<i64> {
+        // Determine whether the addend is stored in the relocation or the data.
+        if self.elf_has_relocation_addend()? {
+            Ok(0)
+        } else {
+            let constant = relocation.addend;
+            relocation.addend = 0;
+            Ok(constant)
+        }
+    }
+
+    pub(crate) fn elf_is_64(&self) -> bool {
+        match self.architecture.address_size().unwrap() {
+            AddressSize::U8 | AddressSize::U16 | AddressSize::U32 => false,
+            AddressSize::U64 => true,
+        }
+    }
+
+    pub(crate) fn elf_write(&self, buffer: &mut dyn WritableBuffer) -> Result<()> {
+        // Create reloc section header names so we can reference them.
+        let is_rela = self.elf_has_relocation_addend()?;
+        let reloc_names: Vec<_> = self
+            .sections
+            .iter()
+            .map(|section| {
+                let mut reloc_name = Vec::with_capacity(
+                    if is_rela { ".rela".len() } else { ".rel".len() } + section.name.len(),
+                );
+                if !section.relocations.is_empty() {
+                    reloc_name.extend_from_slice(if is_rela {
+                        &b".rela"[..]
+                    } else {
+                        &b".rel"[..]
+                    });
+                    reloc_name.extend_from_slice(&section.name);
+                }
+                reloc_name
+            })
+            .collect();
+
+        // Start calculating offsets of everything.
+        let mut writer = Writer::new(self.endian, self.elf_is_64(), buffer);
+        writer.reserve_file_header();
+
+        // Calculate size of section data.
+        let mut comdat_offsets = Vec::with_capacity(self.comdats.len());
+        for comdat in &self.comdats {
+            if comdat.kind != ComdatKind::Any {
+                return Err(Error(format!(
+                    "unsupported COMDAT symbol `{}` kind {:?}",
+                    self.symbols[comdat.symbol.0].name().unwrap_or(""),
+                    comdat.kind
+                )));
+            }
+
+            writer.reserve_section_index();
+            let offset = writer.reserve_comdat(comdat.sections.len());
+            let str_id = writer.add_section_name(b".group");
+            comdat_offsets.push(ComdatOffsets { offset, str_id });
+        }
+        let mut section_offsets = Vec::with_capacity(self.sections.len());
+        for (section, reloc_name) in self.sections.iter().zip(reloc_names.iter()) {
+            let index = writer.reserve_section_index();
+            let offset = writer.reserve(section.data.len(), section.align as usize);
+            let str_id = writer.add_section_name(&section.name);
+            let mut reloc_str_id = None;
+            if !section.relocations.is_empty() {
+                writer.reserve_section_index();
+                reloc_str_id = Some(writer.add_section_name(reloc_name));
+            }
+            section_offsets.push(SectionOffsets {
+                index,
+                offset,
+                str_id,
+                // Relocation data is reserved later.
+                reloc_offset: 0,
+                reloc_str_id,
+            });
+        }
+
+        // Calculate index of symbols and add symbol strings to strtab.
+        let mut symbol_offsets = vec![SymbolOffsets::default(); self.symbols.len()];
+        writer.reserve_null_symbol_index();
+        // Local symbols must come before global.
+        for (index, symbol) in self.symbols.iter().enumerate() {
+            if symbol.is_local() {
+                let section_index = symbol.section.id().map(|s| section_offsets[s.0].index);
+                symbol_offsets[index].index = writer.reserve_symbol_index(section_index);
+            }
+        }
+        let symtab_num_local = writer.symbol_count();
+        for (index, symbol) in self.symbols.iter().enumerate() {
+            if !symbol.is_local() {
+                let section_index = symbol.section.id().map(|s| section_offsets[s.0].index);
+                symbol_offsets[index].index = writer.reserve_symbol_index(section_index);
+            }
+        }
+        for (index, symbol) in self.symbols.iter().enumerate() {
+            if symbol.kind != SymbolKind::Section && !symbol.name.is_empty() {
+                symbol_offsets[index].str_id = Some(writer.add_string(&symbol.name));
+            }
+        }
+
+        // Calculate size of symbols.
+        writer.reserve_symtab_section_index();
+        writer.reserve_symtab();
+        if writer.symtab_shndx_needed() {
+            writer.reserve_symtab_shndx_section_index();
+        }
+        writer.reserve_symtab_shndx();
+        writer.reserve_strtab_section_index();
+        writer.reserve_strtab();
+
+        // Calculate size of relocations.
+        for (index, section) in self.sections.iter().enumerate() {
+            let count = section.relocations.len();
+            if count != 0 {
+                section_offsets[index].reloc_offset = writer.reserve_relocations(count, is_rela);
+            }
+        }
+
+        // Calculate size of section headers.
+        writer.reserve_shstrtab_section_index();
+        writer.reserve_shstrtab();
+        writer.reserve_section_headers();
+
+        // Start writing.
+        let e_type = elf::ET_REL;
+        let e_machine = match (self.architecture, self.sub_architecture) {
+            (Architecture::Aarch64, None) => elf::EM_AARCH64,
+            (Architecture::Aarch64_Ilp32, None) => elf::EM_AARCH64,
+            (Architecture::Arm, None) => elf::EM_ARM,
+            (Architecture::Avr, None) => elf::EM_AVR,
+            (Architecture::Bpf, None) => elf::EM_BPF,
+            (Architecture::Csky, None) => elf::EM_CSKY,
+            (Architecture::I386, None) => elf::EM_386,
+            (Architecture::X86_64, None) => elf::EM_X86_64,
+            (Architecture::X86_64_X32, None) => elf::EM_X86_64,
+            (Architecture::Hexagon, None) => elf::EM_HEXAGON,
+            (Architecture::LoongArch64, None) => elf::EM_LOONGARCH,
+            (Architecture::Mips, None) => elf::EM_MIPS,
+            (Architecture::Mips64, None) => elf::EM_MIPS,
+            (Architecture::Msp430, None) => elf::EM_MSP430,
+            (Architecture::PowerPc, None) => elf::EM_PPC,
+            (Architecture::PowerPc64, None) => elf::EM_PPC64,
+            (Architecture::Riscv32, None) => elf::EM_RISCV,
+            (Architecture::Riscv64, None) => elf::EM_RISCV,
+            (Architecture::S390x, None) => elf::EM_S390,
+            (Architecture::Sbf, None) => elf::EM_SBF,
+            (Architecture::Sharc, None) => elf::EM_SHARC,
+            (Architecture::Sparc64, None) => elf::EM_SPARCV9,
+            (Architecture::Xtensa, None) => elf::EM_XTENSA,
+            _ => {
+                return Err(Error(format!(
+                    "unimplemented architecture {:?} with sub-architecture {:?}",
+                    self.architecture, self.sub_architecture
+                )));
+            }
+        };
+        let (os_abi, abi_version, e_flags) = if let FileFlags::Elf {
+            os_abi,
+            abi_version,
+            e_flags,
+        } = self.flags
+        {
+            (os_abi, abi_version, e_flags)
+        } else {
+            (elf::ELFOSABI_NONE, 0, 0)
+        };
+        writer.write_file_header(&FileHeader {
+            os_abi,
+            abi_version,
+            e_type,
+            e_machine,
+            e_entry: 0,
+            e_flags,
+        })?;
+
+        // Write section data.
+        for comdat in &self.comdats {
+            writer.write_comdat_header();
+            for section in &comdat.sections {
+                writer.write_comdat_entry(section_offsets[section.0].index);
+            }
+        }
+        for (index, section) in self.sections.iter().enumerate() {
+            writer.write_align(section.align as usize);
+            debug_assert_eq!(section_offsets[index].offset, writer.len());
+            writer.write(&section.data);
+        }
+
+        // Write symbols.
+        writer.write_null_symbol();
+        let mut write_symbol = |index: usize, symbol: &Symbol| -> Result<()> {
+            let st_info = if let SymbolFlags::Elf { st_info, .. } = symbol.flags {
+                st_info
+            } else {
+                let st_type = match symbol.kind {
+                    SymbolKind::Null => elf::STT_NOTYPE,
+                    SymbolKind::Text => {
+                        if symbol.is_undefined() {
+                            elf::STT_NOTYPE
+                        } else {
+                            elf::STT_FUNC
+                        }
+                    }
+                    SymbolKind::Data => {
+                        if symbol.is_undefined() {
+                            elf::STT_NOTYPE
+                        } else if symbol.is_common() {
+                            elf::STT_COMMON
+                        } else {
+                            elf::STT_OBJECT
+                        }
+                    }
+                    SymbolKind::Section => elf::STT_SECTION,
+                    SymbolKind::File => elf::STT_FILE,
+                    SymbolKind::Tls => elf::STT_TLS,
+                    SymbolKind::Label => elf::STT_NOTYPE,
+                    SymbolKind::Unknown => {
+                        if symbol.is_undefined() {
+                            elf::STT_NOTYPE
+                        } else {
+                            return Err(Error(format!(
+                                "unimplemented symbol `{}` kind {:?}",
+                                symbol.name().unwrap_or(""),
+                                symbol.kind
+                            )));
+                        }
+                    }
+                };
+                let st_bind = if symbol.weak {
+                    elf::STB_WEAK
+                } else if symbol.is_undefined() {
+                    elf::STB_GLOBAL
+                } else if symbol.is_local() {
+                    elf::STB_LOCAL
+                } else {
+                    elf::STB_GLOBAL
+                };
+                (st_bind << 4) + st_type
+            };
+            let st_other = if let SymbolFlags::Elf { st_other, .. } = symbol.flags {
+                st_other
+            } else if symbol.scope == SymbolScope::Linkage {
+                elf::STV_HIDDEN
+            } else {
+                elf::STV_DEFAULT
+            };
+            let (st_shndx, section) = match symbol.section {
+                SymbolSection::None => {
+                    debug_assert_eq!(symbol.kind, SymbolKind::File);
+                    (elf::SHN_ABS, None)
+                }
+                SymbolSection::Undefined => (elf::SHN_UNDEF, None),
+                SymbolSection::Absolute => (elf::SHN_ABS, None),
+                SymbolSection::Common => (elf::SHN_COMMON, None),
+                SymbolSection::Section(id) => (0, Some(section_offsets[id.0].index)),
+            };
+            writer.write_symbol(&Sym {
+                name: symbol_offsets[index].str_id,
+                section,
+                st_info,
+                st_other,
+                st_shndx,
+                st_value: symbol.value,
+                st_size: symbol.size,
+            });
+            Ok(())
+        };
+        for (index, symbol) in self.symbols.iter().enumerate() {
+            if symbol.is_local() {
+                write_symbol(index, symbol)?;
+            }
+        }
+        for (index, symbol) in self.symbols.iter().enumerate() {
+            if !symbol.is_local() {
+                write_symbol(index, symbol)?;
+            }
+        }
+        writer.write_symtab_shndx();
+        writer.write_strtab();
+
+        // Write relocations.
+        for (index, section) in self.sections.iter().enumerate() {
+            if !section.relocations.is_empty() {
+                writer.write_align_relocation();
+                debug_assert_eq!(section_offsets[index].reloc_offset, writer.len());
+                for reloc in &section.relocations {
+                    let r_type = match self.architecture {
+                        Architecture::Aarch64 => match (reloc.kind, reloc.encoding, reloc.size) {
+                            (RelocationKind::Absolute, RelocationEncoding::Generic, 64) => {
+                                elf::R_AARCH64_ABS64
+                            }
+                            (RelocationKind::Absolute, RelocationEncoding::Generic, 32) => {
+                                elf::R_AARCH64_ABS32
+                            }
+                            (RelocationKind::Absolute, RelocationEncoding::Generic, 16) => {
+                                elf::R_AARCH64_ABS16
+                            }
+                            (RelocationKind::Relative, RelocationEncoding::Generic, 64) => {
+                                elf::R_AARCH64_PREL64
+                            }
+                            (RelocationKind::Relative, RelocationEncoding::Generic, 32) => {
+                                elf::R_AARCH64_PREL32
+                            }
+                            (RelocationKind::Relative, RelocationEncoding::Generic, 16) => {
+                                elf::R_AARCH64_PREL16
+                            }
+                            (RelocationKind::Relative, RelocationEncoding::AArch64Call, 26)
+                            | (RelocationKind::PltRelative, RelocationEncoding::AArch64Call, 26) => {
+                                elf::R_AARCH64_CALL26
+                            }
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::Aarch64_Ilp32 => {
+                            match (reloc.kind, reloc.encoding, reloc.size) {
+                                (RelocationKind::Absolute, RelocationEncoding::Generic, 32) => {
+                                    elf::R_AARCH64_P32_ABS32
+                                }
+                                (RelocationKind::Elf(x), _, _) => x,
+                                _ => {
+                                    return Err(Error(format!(
+                                        "unimplemented relocation {:?}",
+                                        reloc
+                                    )));
+                                }
+                            }
+                        }
+                        Architecture::Arm => match (reloc.kind, reloc.encoding, reloc.size) {
+                            (RelocationKind::Absolute, _, 32) => elf::R_ARM_ABS32,
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::Avr => match (reloc.kind, reloc.encoding, reloc.size) {
+                            (RelocationKind::Absolute, _, 32) => elf::R_AVR_32,
+                            (RelocationKind::Absolute, _, 16) => elf::R_AVR_16,
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::Bpf => match (reloc.kind, reloc.encoding, reloc.size) {
+                            (RelocationKind::Absolute, _, 64) => elf::R_BPF_64_64,
+                            (RelocationKind::Absolute, _, 32) => elf::R_BPF_64_32,
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::Csky => match (reloc.kind, reloc.encoding, reloc.size) {
+                            (RelocationKind::Absolute, _, 32) => elf::R_CKCORE_ADDR32,
+                            (RelocationKind::Relative, RelocationEncoding::Generic, 32) => {
+                                elf::R_CKCORE_PCREL32
+                            }
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::I386 => match (reloc.kind, reloc.size) {
+                            (RelocationKind::Absolute, 32) => elf::R_386_32,
+                            (RelocationKind::Relative, 32) => elf::R_386_PC32,
+                            (RelocationKind::Got, 32) => elf::R_386_GOT32,
+                            (RelocationKind::PltRelative, 32) => elf::R_386_PLT32,
+                            (RelocationKind::GotBaseOffset, 32) => elf::R_386_GOTOFF,
+                            (RelocationKind::GotBaseRelative, 32) => elf::R_386_GOTPC,
+                            (RelocationKind::Absolute, 16) => elf::R_386_16,
+                            (RelocationKind::Relative, 16) => elf::R_386_PC16,
+                            (RelocationKind::Absolute, 8) => elf::R_386_8,
+                            (RelocationKind::Relative, 8) => elf::R_386_PC8,
+                            (RelocationKind::Elf(x), _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::X86_64 | Architecture::X86_64_X32 => {
+                            match (reloc.kind, reloc.encoding, reloc.size) {
+                                (RelocationKind::Absolute, RelocationEncoding::Generic, 64) => {
+                                    elf::R_X86_64_64
+                                }
+                                (RelocationKind::Relative, RelocationEncoding::X86Branch, 32) => {
+                                    elf::R_X86_64_PLT32
+                                }
+                                (RelocationKind::Relative, _, 32) => elf::R_X86_64_PC32,
+                                (RelocationKind::Got, _, 32) => elf::R_X86_64_GOT32,
+                                (RelocationKind::PltRelative, _, 32) => elf::R_X86_64_PLT32,
+                                (RelocationKind::GotRelative, _, 32) => elf::R_X86_64_GOTPCREL,
+                                (RelocationKind::Absolute, RelocationEncoding::Generic, 32) => {
+                                    elf::R_X86_64_32
+                                }
+                                (RelocationKind::Absolute, RelocationEncoding::X86Signed, 32) => {
+                                    elf::R_X86_64_32S
+                                }
+                                (RelocationKind::Absolute, _, 16) => elf::R_X86_64_16,
+                                (RelocationKind::Relative, _, 16) => elf::R_X86_64_PC16,
+                                (RelocationKind::Absolute, _, 8) => elf::R_X86_64_8,
+                                (RelocationKind::Relative, _, 8) => elf::R_X86_64_PC8,
+                                (RelocationKind::Elf(x), _, _) => x,
+                                _ => {
+                                    return Err(Error(format!(
+                                        "unimplemented relocation {:?}",
+                                        reloc
+                                    )));
+                                }
+                            }
+                        }
+                        Architecture::Hexagon => match (reloc.kind, reloc.encoding, reloc.size) {
+                            (RelocationKind::Absolute, _, 32) => elf::R_HEX_32,
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::LoongArch64 => match (reloc.kind, reloc.encoding, reloc.size)
+                        {
+                            (RelocationKind::Absolute, _, 32) => elf::R_LARCH_32,
+                            (RelocationKind::Absolute, _, 64) => elf::R_LARCH_64,
+                            (RelocationKind::Relative, _, 32) => elf::R_LARCH_32_PCREL,
+                            (RelocationKind::Relative, _, 64) => elf::R_LARCH_64_PCREL,
+                            (RelocationKind::Relative, RelocationEncoding::LoongArchBranch, 16)
+                            | (
+                                RelocationKind::PltRelative,
+                                RelocationEncoding::LoongArchBranch,
+                                16,
+                            ) => elf::R_LARCH_B16,
+                            (RelocationKind::Relative, RelocationEncoding::LoongArchBranch, 21)
+                            | (
+                                RelocationKind::PltRelative,
+                                RelocationEncoding::LoongArchBranch,
+                                21,
+                            ) => elf::R_LARCH_B21,
+                            (RelocationKind::Relative, RelocationEncoding::LoongArchBranch, 26)
+                            | (
+                                RelocationKind::PltRelative,
+                                RelocationEncoding::LoongArchBranch,
+                                26,
+                            ) => elf::R_LARCH_B26,
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::Mips | Architecture::Mips64 => {
+                            match (reloc.kind, reloc.encoding, reloc.size) {
+                                (RelocationKind::Absolute, _, 16) => elf::R_MIPS_16,
+                                (RelocationKind::Absolute, _, 32) => elf::R_MIPS_32,
+                                (RelocationKind::Absolute, _, 64) => elf::R_MIPS_64,
+                                (RelocationKind::Elf(x), _, _) => x,
+                                _ => {
+                                    return Err(Error(format!(
+                                        "unimplemented relocation {:?}",
+                                        reloc
+                                    )));
+                                }
+                            }
+                        }
+                        Architecture::Msp430 => match (reloc.kind, reloc.encoding, reloc.size) {
+                            (RelocationKind::Absolute, _, 32) => elf::R_MSP430_32,
+                            (RelocationKind::Absolute, _, 16) => elf::R_MSP430_16_BYTE,
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::PowerPc => match (reloc.kind, reloc.encoding, reloc.size) {
+                            (RelocationKind::Absolute, _, 32) => elf::R_PPC_ADDR32,
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::PowerPc64 => match (reloc.kind, reloc.encoding, reloc.size) {
+                            (RelocationKind::Absolute, _, 32) => elf::R_PPC64_ADDR32,
+                            (RelocationKind::Absolute, _, 64) => elf::R_PPC64_ADDR64,
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::Riscv32 | Architecture::Riscv64 => {
+                            match (reloc.kind, reloc.encoding, reloc.size) {
+                                (RelocationKind::Absolute, _, 32) => elf::R_RISCV_32,
+                                (RelocationKind::Absolute, _, 64) => elf::R_RISCV_64,
+                                (RelocationKind::Relative, RelocationEncoding::Generic, 32) => {
+                                    elf::R_RISCV_32_PCREL
+                                }
+                                (RelocationKind::Elf(x), _, _) => x,
+                                _ => {
+                                    return Err(Error(format!(
+                                        "unimplemented relocation {:?}",
+                                        reloc
+                                    )));
+                                }
+                            }
+                        }
+                        Architecture::S390x => match (reloc.kind, reloc.encoding, reloc.size) {
+                            (RelocationKind::Absolute, RelocationEncoding::Generic, 8) => {
+                                elf::R_390_8
+                            }
+                            (RelocationKind::Absolute, RelocationEncoding::Generic, 16) => {
+                                elf::R_390_16
+                            }
+                            (RelocationKind::Absolute, RelocationEncoding::Generic, 32) => {
+                                elf::R_390_32
+                            }
+                            (RelocationKind::Absolute, RelocationEncoding::Generic, 64) => {
+                                elf::R_390_64
+                            }
+                            (RelocationKind::Relative, RelocationEncoding::Generic, 16) => {
+                                elf::R_390_PC16
+                            }
+                            (RelocationKind::Relative, RelocationEncoding::Generic, 32) => {
+                                elf::R_390_PC32
+                            }
+                            (RelocationKind::Relative, RelocationEncoding::Generic, 64) => {
+                                elf::R_390_PC64
+                            }
+                            (RelocationKind::Relative, RelocationEncoding::S390xDbl, 16) => {
+                                elf::R_390_PC16DBL
+                            }
+                            (RelocationKind::Relative, RelocationEncoding::S390xDbl, 32) => {
+                                elf::R_390_PC32DBL
+                            }
+                            (RelocationKind::PltRelative, RelocationEncoding::S390xDbl, 16) => {
+                                elf::R_390_PLT16DBL
+                            }
+                            (RelocationKind::PltRelative, RelocationEncoding::S390xDbl, 32) => {
+                                elf::R_390_PLT32DBL
+                            }
+                            (RelocationKind::Got, RelocationEncoding::Generic, 16) => {
+                                elf::R_390_GOT16
+                            }
+                            (RelocationKind::Got, RelocationEncoding::Generic, 32) => {
+                                elf::R_390_GOT32
+                            }
+                            (RelocationKind::Got, RelocationEncoding::Generic, 64) => {
+                                elf::R_390_GOT64
+                            }
+                            (RelocationKind::GotRelative, RelocationEncoding::S390xDbl, 32) => {
+                                elf::R_390_GOTENT
+                            }
+                            (RelocationKind::GotBaseOffset, RelocationEncoding::Generic, 16) => {
+                                elf::R_390_GOTOFF16
+                            }
+                            (RelocationKind::GotBaseOffset, RelocationEncoding::Generic, 32) => {
+                                elf::R_390_GOTOFF32
+                            }
+                            (RelocationKind::GotBaseOffset, RelocationEncoding::Generic, 64) => {
+                                elf::R_390_GOTOFF64
+                            }
+                            (RelocationKind::GotBaseRelative, RelocationEncoding::Generic, 64) => {
+                                elf::R_390_GOTPC
+                            }
+                            (RelocationKind::GotBaseRelative, RelocationEncoding::S390xDbl, 32) => {
+                                elf::R_390_GOTPCDBL
+                            }
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::Sbf => match (reloc.kind, reloc.encoding, reloc.size) {
+                            (RelocationKind::Absolute, _, 64) => elf::R_SBF_64_64,
+                            (RelocationKind::Absolute, _, 32) => elf::R_SBF_64_32,
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::Sharc => match (reloc.kind, reloc.encoding, reloc.size) {
+                            (RelocationKind::Absolute, RelocationEncoding::SharcTypeA, 32) => {
+                                elf::R_SHARC_ADDR32_V3
+                            }
+                            (RelocationKind::Absolute, RelocationEncoding::Generic, 32) => {
+                                elf::R_SHARC_ADDR_VAR_V3
+                            }
+                            (RelocationKind::Relative, RelocationEncoding::SharcTypeA, 24) => {
+                                elf::R_SHARC_PCRLONG_V3
+                            }
+                            (RelocationKind::Relative, RelocationEncoding::SharcTypeA, 6) => {
+                                elf::R_SHARC_PCRSHORT_V3
+                            }
+                            (RelocationKind::Relative, RelocationEncoding::SharcTypeB, 6) => {
+                                elf::R_SHARC_PCRSHORT_V3
+                            }
+                            (RelocationKind::Absolute, RelocationEncoding::Generic, 16) => {
+                                elf::R_SHARC_ADDR_VAR16_V3
+                            }
+                            (RelocationKind::Absolute, RelocationEncoding::SharcTypeA, 16) => {
+                                elf::R_SHARC_DATA16_V3
+                            }
+                            (RelocationKind::Absolute, RelocationEncoding::SharcTypeB, 16) => {
+                                elf::R_SHARC_DATA16_VISA_V3
+                            }
+                            (RelocationKind::Absolute, RelocationEncoding::SharcTypeA, 24) => {
+                                elf::R_SHARC_ADDR24_V3
+                            }
+                            (RelocationKind::Absolute, RelocationEncoding::SharcTypeA, 6) => {
+                                elf::R_SHARC_DATA6_V3
+                            }
+                            (RelocationKind::Absolute, RelocationEncoding::SharcTypeB, 6) => {
+                                elf::R_SHARC_DATA6_VISA_V3
+                            }
+                            (RelocationKind::Absolute, RelocationEncoding::SharcTypeB, 7) => {
+                                elf::R_SHARC_DATA7_VISA_V3
+                            }
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::Sparc64 => match (reloc.kind, reloc.encoding, reloc.size) {
+                            // TODO: use R_SPARC_32/R_SPARC_64 if aligned.
+                            (RelocationKind::Absolute, _, 32) => elf::R_SPARC_UA32,
+                            (RelocationKind::Absolute, _, 64) => elf::R_SPARC_UA64,
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        Architecture::Xtensa => match (reloc.kind, reloc.encoding, reloc.size) {
+                            (RelocationKind::Absolute, _, 32) => elf::R_XTENSA_32,
+                            (RelocationKind::Relative, RelocationEncoding::Generic, 32) => {
+                                elf::R_XTENSA_32_PCREL
+                            }
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
+                        _ => {
+                            if let RelocationKind::Elf(x) = reloc.kind {
+                                x
+                            } else {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        }
+                    };
+                    let r_sym = symbol_offsets[reloc.symbol.0].index.0;
+                    writer.write_relocation(
+                        is_rela,
+                        &Rel {
+                            r_offset: reloc.offset,
+                            r_sym,
+                            r_type,
+                            r_addend: reloc.addend,
+                        },
+                    );
+                }
+            }
+        }
+
+        writer.write_shstrtab();
+
+        // Write section headers.
+        writer.write_null_section_header();
+
+        let symtab_index = writer.symtab_index();
+        for (comdat, comdat_offset) in self.comdats.iter().zip(comdat_offsets.iter()) {
+            writer.write_comdat_section_header(
+                comdat_offset.str_id,
+                symtab_index,
+                symbol_offsets[comdat.symbol.0].index,
+                comdat_offset.offset,
+                comdat.sections.len(),
+            );
+        }
+        for (index, section) in self.sections.iter().enumerate() {
+            let sh_type = match section.kind {
+                SectionKind::UninitializedData | SectionKind::UninitializedTls => elf::SHT_NOBITS,
+                SectionKind::Note => elf::SHT_NOTE,
+                SectionKind::Elf(sh_type) => sh_type,
+                _ => elf::SHT_PROGBITS,
+            };
+            let sh_flags = if let SectionFlags::Elf { sh_flags } = section.flags {
+                sh_flags
+            } else {
+                match section.kind {
+                    SectionKind::Text => elf::SHF_ALLOC | elf::SHF_EXECINSTR,
+                    SectionKind::Data | SectionKind::ReadOnlyDataWithRel => {
+                        elf::SHF_ALLOC | elf::SHF_WRITE
+                    }
+                    SectionKind::Tls => elf::SHF_ALLOC | elf::SHF_WRITE | elf::SHF_TLS,
+                    SectionKind::UninitializedData => elf::SHF_ALLOC | elf::SHF_WRITE,
+                    SectionKind::UninitializedTls => elf::SHF_ALLOC | elf::SHF_WRITE | elf::SHF_TLS,
+                    SectionKind::ReadOnlyData => elf::SHF_ALLOC,
+                    SectionKind::ReadOnlyString => {
+                        elf::SHF_ALLOC | elf::SHF_STRINGS | elf::SHF_MERGE
+                    }
+                    SectionKind::OtherString => elf::SHF_STRINGS | elf::SHF_MERGE,
+                    SectionKind::Other
+                    | SectionKind::Debug
+                    | SectionKind::Metadata
+                    | SectionKind::Linker
+                    | SectionKind::Note
+                    | SectionKind::Elf(_) => 0,
+                    SectionKind::Unknown | SectionKind::Common | SectionKind::TlsVariables => {
+                        return Err(Error(format!(
+                            "unimplemented section `{}` kind {:?}",
+                            section.name().unwrap_or(""),
+                            section.kind
+                        )));
+                    }
+                }
+                .into()
+            };
+            // TODO: not sure if this is correct, maybe user should determine this
+            let sh_entsize = match section.kind {
+                SectionKind::ReadOnlyString | SectionKind::OtherString => 1,
+                _ => 0,
+            };
+            writer.write_section_header(&SectionHeader {
+                name: Some(section_offsets[index].str_id),
+                sh_type,
+                sh_flags,
+                sh_addr: 0,
+                sh_offset: section_offsets[index].offset as u64,
+                sh_size: section.size,
+                sh_link: 0,
+                sh_info: 0,
+                sh_addralign: section.align,
+                sh_entsize,
+            });
+
+            if !section.relocations.is_empty() {
+                writer.write_relocation_section_header(
+                    section_offsets[index].reloc_str_id.unwrap(),
+                    section_offsets[index].index,
+                    symtab_index,
+                    section_offsets[index].reloc_offset,
+                    section.relocations.len(),
+                    is_rela,
+                );
+            }
+        }
+
+        writer.write_symtab_section_header(symtab_num_local);
+        writer.write_symtab_shndx_section_header();
+        writer.write_strtab_section_header();
+        writer.write_shstrtab_section_header();
+
+        debug_assert_eq!(writer.reserved_len(), writer.len());
+
+        Ok(())
+    }
+}

vendor/object/src/write/mod.rs

@@ -0,0 +1,961 @@
+//! Interface for writing object files.
+
+use alloc::borrow::Cow;
+use alloc::string::String;
+use alloc::vec::Vec;
+use core::{fmt, result, str};
+#[cfg(not(feature = "std"))]
+use hashbrown::HashMap;
+#[cfg(feature = "std")]
+use std::{boxed::Box, collections::HashMap, error, io};
+
+use crate::endian::{Endianness, U32, U64};
+use crate::{
+    Architecture, BinaryFormat, ComdatKind, FileFlags, RelocationEncoding, RelocationKind,
+    SectionFlags, SectionKind, SubArchitecture, SymbolFlags, SymbolKind, SymbolScope,
+};
+
+#[cfg(feature = "coff")]
+pub mod coff;
+#[cfg(feature = "coff")]
+pub use coff::CoffExportStyle;
+
+#[cfg(feature = "elf")]
+pub mod elf;
+
+#[cfg(feature = "macho")]
+mod macho;
+#[cfg(feature = "macho")]
+pub use macho::MachOBuildVersion;
+
+#[cfg(feature = "pe")]
+pub mod pe;
+
+#[cfg(feature = "xcoff")]
+mod xcoff;
+
+mod string;
+pub use string::StringId;
+
+mod util;
+pub use util::*;
+
+/// The error type used within the write module.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct Error(String);
+
+impl fmt::Display for Error {
+    #[inline]
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.write_str(&self.0)
+    }
+}
+
+#[cfg(feature = "std")]
+impl error::Error for Error {}
+
+/// The result type used within the write module.
+pub type Result<T> = result::Result<T, Error>;
+
+/// A writable relocatable object file.
+#[derive(Debug)]
+pub struct Object<'a> {
+    format: BinaryFormat,
+    architecture: Architecture,
+    sub_architecture: Option<SubArchitecture>,
+    endian: Endianness,
+    sections: Vec<Section<'a>>,
+    standard_sections: HashMap<StandardSection, SectionId>,
+    symbols: Vec<Symbol>,
+    symbol_map: HashMap<Vec<u8>, SymbolId>,
+    stub_symbols: HashMap<SymbolId, SymbolId>,
+    comdats: Vec<Comdat>,
+    /// File flags that are specific to each file format.
+    pub flags: FileFlags,
+    /// The symbol name mangling scheme.
+    pub mangling: Mangling,
+    /// Mach-O "_tlv_bootstrap" symbol.
+    tlv_bootstrap: Option<SymbolId>,
+    /// Mach-O CPU subtype.
+    #[cfg(feature = "macho")]
+    macho_cpu_subtype: Option<u32>,
+    #[cfg(feature = "macho")]
+    macho_build_version: Option<MachOBuildVersion>,
+}
+
+impl<'a> Object<'a> {
+    /// Create an empty object file.
+    pub fn new(format: BinaryFormat, architecture: Architecture, endian: Endianness) -> Object<'a> {
+        Object {
+            format,
+            architecture,
+            sub_architecture: None,
+            endian,
+            sections: Vec::new(),
+            standard_sections: HashMap::new(),
+            symbols: Vec::new(),
+            symbol_map: HashMap::new(),
+            stub_symbols: HashMap::new(),
+            comdats: Vec::new(),
+            flags: FileFlags::None,
+            mangling: Mangling::default(format, architecture),
+            tlv_bootstrap: None,
+            #[cfg(feature = "macho")]
+            macho_cpu_subtype: None,
+            #[cfg(feature = "macho")]
+            macho_build_version: None,
+        }
+    }
+
+    /// Return the file format.
+    #[inline]
+    pub fn format(&self) -> BinaryFormat {
+        self.format
+    }
+
+    /// Return the architecture.
+    #[inline]
+    pub fn architecture(&self) -> Architecture {
+        self.architecture
+    }
+
+    /// Return the sub-architecture.
+    #[inline]
+    pub fn sub_architecture(&self) -> Option<SubArchitecture> {
+        self.sub_architecture
+    }
+
+    /// Specify the sub-architecture.
+    pub fn set_sub_architecture(&mut self, sub_architecture: Option<SubArchitecture>) {
+        self.sub_architecture = sub_architecture;
+    }
+
+    /// Return the current mangling setting.
+    #[inline]
+    pub fn mangling(&self) -> Mangling {
+        self.mangling
+    }
+
+    /// Specify the mangling setting.
+    #[inline]
+    pub fn set_mangling(&mut self, mangling: Mangling) {
+        self.mangling = mangling;
+    }
+
+    /// Return the name for a standard segment.
+    ///
+    /// This will vary based on the file format.
+    #[allow(unused_variables)]
+    pub fn segment_name(&self, segment: StandardSegment) -> &'static [u8] {
+        match self.format {
+            #[cfg(feature = "coff")]
+            BinaryFormat::Coff => &[],
+            #[cfg(feature = "elf")]
+            BinaryFormat::Elf => &[],
+            #[cfg(feature = "macho")]
+            BinaryFormat::MachO => self.macho_segment_name(segment),
+            _ => unimplemented!(),
+        }
+    }
+
+    /// Get the section with the given `SectionId`.
+    #[inline]
+    pub fn section(&self, section: SectionId) -> &Section<'a> {
+        &self.sections[section.0]
+    }
+
+    /// Mutably get the section with the given `SectionId`.
+    #[inline]
+    pub fn section_mut(&mut self, section: SectionId) -> &mut Section<'a> {
+        &mut self.sections[section.0]
+    }
+
+    /// Set the data for an existing section.
+    ///
+    /// Must not be called for sections that already have data, or that contain uninitialized data.
+    pub fn set_section_data<T>(&mut self, section: SectionId, data: T, align: u64)
+    where
+        T: Into<Cow<'a, [u8]>>,
+    {
+        self.sections[section.0].set_data(data, align)
+    }
+
+    /// Append data to an existing section. Returns the section offset of the data.
+    pub fn append_section_data(&mut self, section: SectionId, data: &[u8], align: u64) -> u64 {
+        self.sections[section.0].append_data(data, align)
+    }
+
+    /// Append zero-initialized data to an existing section. Returns the section offset of the data.
+    pub fn append_section_bss(&mut self, section: SectionId, size: u64, align: u64) -> u64 {
+        self.sections[section.0].append_bss(size, align)
+    }
+
+    /// Return the `SectionId` of a standard section.
+    ///
+    /// If the section doesn't already exist then it is created.
+    pub fn section_id(&mut self, section: StandardSection) -> SectionId {
+        self.standard_sections
+            .get(&section)
+            .cloned()
+            .unwrap_or_else(|| {
+                let (segment, name, kind, flags) = self.section_info(section);
+                let id = self.add_section(segment.to_vec(), name.to_vec(), kind);
+                self.section_mut(id).flags = flags;
+                id
+            })
+    }
+
+    /// Add a new section and return its `SectionId`.
+    ///
+    /// This also creates a section symbol.
+    pub fn add_section(&mut self, segment: Vec<u8>, name: Vec<u8>, kind: SectionKind) -> SectionId {
+        let id = SectionId(self.sections.len());
+        self.sections.push(Section {
+            segment,
+            name,
+            kind,
+            size: 0,
+            align: 1,
+            data: Cow::Borrowed(&[]),
+            relocations: Vec::new(),
+            symbol: None,
+            flags: SectionFlags::None,
+        });
+
+        // Add to self.standard_sections if required. This may match multiple standard sections.
+        let section = &self.sections[id.0];
+        for standard_section in StandardSection::all() {
+            if !self.standard_sections.contains_key(standard_section) {
+                let (segment, name, kind, _flags) = self.section_info(*standard_section);
+                if segment == &*section.segment && name == &*section.name && kind == section.kind {
+                    self.standard_sections.insert(*standard_section, id);
+                }
+            }
+        }
+
+        id
+    }
+
+    fn section_info(
+        &self,
+        section: StandardSection,
+    ) -> (&'static [u8], &'static [u8], SectionKind, SectionFlags) {
+        match self.format {
+            #[cfg(feature = "coff")]
+            BinaryFormat::Coff => self.coff_section_info(section),
+            #[cfg(feature = "elf")]
+            BinaryFormat::Elf => self.elf_section_info(section),
+            #[cfg(feature = "macho")]
+            BinaryFormat::MachO => self.macho_section_info(section),
+            #[cfg(feature = "xcoff")]
+            BinaryFormat::Xcoff => self.xcoff_section_info(section),
+            _ => unimplemented!(),
+        }
+    }
+
+    /// Add a subsection. Returns the `SectionId` and section offset of the data.
+    pub fn add_subsection(
+        &mut self,
+        section: StandardSection,
+        name: &[u8],
+        data: &[u8],
+        align: u64,
+    ) -> (SectionId, u64) {
+        let section_id = if self.has_subsections_via_symbols() {
+            self.set_subsections_via_symbols();
+            self.section_id(section)
+        } else {
+            let (segment, name, kind, flags) = self.subsection_info(section, name);
+            let id = self.add_section(segment.to_vec(), name, kind);
+            self.section_mut(id).flags = flags;
+            id
+        };
+        let offset = self.append_section_data(section_id, data, align);
+        (section_id, offset)
+    }
+
+    fn has_subsections_via_symbols(&self) -> bool {
+        match self.format {
+            BinaryFormat::Coff | BinaryFormat::Elf | BinaryFormat::Xcoff => false,
+            BinaryFormat::MachO => true,
+            _ => unimplemented!(),
+        }
+    }
+
+    fn set_subsections_via_symbols(&mut self) {
+        match self.format {
+            #[cfg(feature = "macho")]
+            BinaryFormat::MachO => self.macho_set_subsections_via_symbols(),
+            _ => unimplemented!(),
+        }
+    }
+
+    fn subsection_info(
+        &self,
+        section: StandardSection,
+        value: &[u8],
+    ) -> (&'static [u8], Vec<u8>, SectionKind, SectionFlags) {
+        let (segment, section, kind, flags) = self.section_info(section);
+        let name = self.subsection_name(section, value);
+        (segment, name, kind, flags)
+    }
+
+    #[allow(unused_variables)]
+    fn subsection_name(&self, section: &[u8], value: &[u8]) -> Vec<u8> {
+        debug_assert!(!self.has_subsections_via_symbols());
+        match self.format {
+            #[cfg(feature = "coff")]
+            BinaryFormat::Coff => self.coff_subsection_name(section, value),
+            #[cfg(feature = "elf")]
+            BinaryFormat::Elf => self.elf_subsection_name(section, value),
+            _ => unimplemented!(),
+        }
+    }
+
+    /// Get the COMDAT section group with the given `ComdatId`.
+    #[inline]
+    pub fn comdat(&self, comdat: ComdatId) -> &Comdat {
+        &self.comdats[comdat.0]
+    }
+
+    /// Mutably get the COMDAT section group with the given `ComdatId`.
+    #[inline]
+    pub fn comdat_mut(&mut self, comdat: ComdatId) -> &mut Comdat {
+        &mut self.comdats[comdat.0]
+    }
+
+    /// Add a new COMDAT section group and return its `ComdatId`.
+    pub fn add_comdat(&mut self, comdat: Comdat) -> ComdatId {
+        let comdat_id = ComdatId(self.comdats.len());
+        self.comdats.push(comdat);
+        comdat_id
+    }
+
+    /// Get the `SymbolId` of the symbol with the given name.
+    pub fn symbol_id(&self, name: &[u8]) -> Option<SymbolId> {
+        self.symbol_map.get(name).cloned()
+    }
+
+    /// Get the symbol with the given `SymbolId`.
+    #[inline]
+    pub fn symbol(&self, symbol: SymbolId) -> &Symbol {
+        &self.symbols[symbol.0]
+    }
+
+    /// Mutably get the symbol with the given `SymbolId`.
+    #[inline]
+    pub fn symbol_mut(&mut self, symbol: SymbolId) -> &mut Symbol {
+        &mut self.symbols[symbol.0]
+    }
+
+    /// Add a new symbol and return its `SymbolId`.
+    pub fn add_symbol(&mut self, mut symbol: Symbol) -> SymbolId {
+        // Defined symbols must have a scope.
+        debug_assert!(symbol.is_undefined() || symbol.scope != SymbolScope::Unknown);
+        if symbol.kind == SymbolKind::Section {
+            // There can only be one section symbol, but update its flags, since
+            // the automatically generated section symbol will have none.
+            let symbol_id = self.section_symbol(symbol.section.id().unwrap());
+            if symbol.flags != SymbolFlags::None {
+                self.symbol_mut(symbol_id).flags = symbol.flags;
+            }
+            return symbol_id;
+        }
+        if !symbol.name.is_empty()
+            && (symbol.kind == SymbolKind::Text
+                || symbol.kind == SymbolKind::Data
+                || symbol.kind == SymbolKind::Tls)
+        {
+            let unmangled_name = symbol.name.clone();
+            if let Some(prefix) = self.mangling.global_prefix() {
+                symbol.name.insert(0, prefix);
+            }
+            let symbol_id = self.add_raw_symbol(symbol);
+            self.symbol_map.insert(unmangled_name, symbol_id);
+            symbol_id
+        } else {
+            self.add_raw_symbol(symbol)
+        }
+    }
+
+    fn add_raw_symbol(&mut self, symbol: Symbol) -> SymbolId {
+        let symbol_id = SymbolId(self.symbols.len());
+        self.symbols.push(symbol);
+        symbol_id
+    }
+
+    /// Return true if the file format supports `StandardSection::UninitializedTls`.
+    #[inline]
+    pub fn has_uninitialized_tls(&self) -> bool {
+        self.format != BinaryFormat::Coff
+    }
+
+    /// Return true if the file format supports `StandardSection::Common`.
+    #[inline]
+    pub fn has_common(&self) -> bool {
+        self.format == BinaryFormat::MachO
+    }
+
+    /// Add a new common symbol and return its `SymbolId`.
+    ///
+    /// For Mach-O, this appends the symbol to the `__common` section.
+    pub fn add_common_symbol(&mut self, mut symbol: Symbol, size: u64, align: u64) -> SymbolId {
+        if self.has_common() {
+            let symbol_id = self.add_symbol(symbol);
+            let section = self.section_id(StandardSection::Common);
+            self.add_symbol_bss(symbol_id, section, size, align);
+            symbol_id
+        } else {
+            symbol.section = SymbolSection::Common;
+            symbol.size = size;
+            self.add_symbol(symbol)
+        }
+    }
+
+    /// Add a new file symbol and return its `SymbolId`.
+    pub fn add_file_symbol(&mut self, name: Vec<u8>) -> SymbolId {
+        self.add_raw_symbol(Symbol {
+            name,
+            value: 0,
+            size: 0,
+            kind: SymbolKind::File,
+            scope: SymbolScope::Compilation,
+            weak: false,
+            section: SymbolSection::None,
+            flags: SymbolFlags::None,
+        })
+    }
+
+    /// Get the symbol for a section.
+    pub fn section_symbol(&mut self, section_id: SectionId) -> SymbolId {
+        let section = &mut self.sections[section_id.0];
+        if let Some(symbol) = section.symbol {
+            return symbol;
+        }
+        let name = if self.format == BinaryFormat::Coff {
+            section.name.clone()
+        } else {
+            Vec::new()
+        };
+        let symbol_id = SymbolId(self.symbols.len());
+        self.symbols.push(Symbol {
+            name,
+            value: 0,
+            size: 0,
+            kind: SymbolKind::Section,
+            scope: SymbolScope::Compilation,
+            weak: false,
+            section: SymbolSection::Section(section_id),
+            flags: SymbolFlags::None,
+        });
+        section.symbol = Some(symbol_id);
+        symbol_id
+    }
+
+    /// Append data to an existing section, and update a symbol to refer to it.
+    ///
+    /// For Mach-O, this also creates a `__thread_vars` entry for TLS symbols, and the
+    /// symbol will indirectly point to the added data via the `__thread_vars` entry.
+    ///
+    /// Returns the section offset of the data.
+    pub fn add_symbol_data(
+        &mut self,
+        symbol_id: SymbolId,
+        section: SectionId,
+        data: &[u8],
+        align: u64,
+    ) -> u64 {
+        let offset = self.append_section_data(section, data, align);
+        self.set_symbol_data(symbol_id, section, offset, data.len() as u64);
+        offset
+    }
+
+    /// Append zero-initialized data to an existing section, and update a symbol to refer to it.
+    ///
+    /// For Mach-O, this also creates a `__thread_vars` entry for TLS symbols, and the
+    /// symbol will indirectly point to the added data via the `__thread_vars` entry.
+    ///
+    /// Returns the section offset of the data.
+    pub fn add_symbol_bss(
+        &mut self,
+        symbol_id: SymbolId,
+        section: SectionId,
+        size: u64,
+        align: u64,
+    ) -> u64 {
+        let offset = self.append_section_bss(section, size, align);
+        self.set_symbol_data(symbol_id, section, offset, size);
+        offset
+    }
+
+    /// Update a symbol to refer to the given data within a section.
+    ///
+    /// For Mach-O, this also creates a `__thread_vars` entry for TLS symbols, and the
+    /// symbol will indirectly point to the data via the `__thread_vars` entry.
+    #[allow(unused_mut)]
+    pub fn set_symbol_data(
+        &mut self,
+        mut symbol_id: SymbolId,
+        section: SectionId,
+        offset: u64,
+        size: u64,
+    ) {
+        // Defined symbols must have a scope.
+        debug_assert!(self.symbol(symbol_id).scope != SymbolScope::Unknown);
+        match self.format {
+            #[cfg(feature = "macho")]
+            BinaryFormat::MachO => symbol_id = self.macho_add_thread_var(symbol_id),
+            _ => {}
+        }
+        let symbol = self.symbol_mut(symbol_id);
+        symbol.value = offset;
+        symbol.size = size;
+        symbol.section = SymbolSection::Section(section);
+    }
+
+    /// Convert a symbol to a section symbol and offset.
+    ///
+    /// Returns `None` if the symbol does not have a section.
+    pub fn symbol_section_and_offset(&mut self, symbol_id: SymbolId) -> Option<(SymbolId, u64)> {
+        let symbol = self.symbol(symbol_id);
+        if symbol.kind == SymbolKind::Section {
+            return Some((symbol_id, 0));
+        }
+        let symbol_offset = symbol.value;
+        let section = symbol.section.id()?;
+        let section_symbol = self.section_symbol(section);
+        Some((section_symbol, symbol_offset))
+    }
+
+    /// Add a relocation to a section.
+    ///
+    /// Relocations must only be added after the referenced symbols have been added
+    /// and defined (if applicable).
+    pub fn add_relocation(&mut self, section: SectionId, mut relocation: Relocation) -> Result<()> {
+        let addend = match self.format {
+            #[cfg(feature = "coff")]
+            BinaryFormat::Coff => self.coff_fixup_relocation(&mut relocation),
+            #[cfg(feature = "elf")]
+            BinaryFormat::Elf => self.elf_fixup_relocation(&mut relocation)?,
+            #[cfg(feature = "macho")]
+            BinaryFormat::MachO => self.macho_fixup_relocation(&mut relocation),
+            #[cfg(feature = "xcoff")]
+            BinaryFormat::Xcoff => self.xcoff_fixup_relocation(&mut relocation),
+            _ => unimplemented!(),
+        };
+        if addend != 0 {
+            self.write_relocation_addend(section, &relocation, addend)?;
+        }
+        self.sections[section.0].relocations.push(relocation);
+        Ok(())
+    }
+
+    fn write_relocation_addend(
+        &mut self,
+        section: SectionId,
+        relocation: &Relocation,
+        addend: i64,
+    ) -> Result<()> {
+        let data = self.sections[section.0].data_mut();
+        let offset = relocation.offset as usize;
+        match relocation.size {
+            32 => data.write_at(offset, &U32::new(self.endian, addend as u32)),
+            64 => data.write_at(offset, &U64::new(self.endian, addend as u64)),
+            _ => {
+                return Err(Error(format!(
+                    "unimplemented relocation addend {:?}",
+                    relocation
+                )));
+            }
+        }
+        .map_err(|_| {
+            Error(format!(
+                "invalid relocation offset {}+{} (max {})",
+                relocation.offset,
+                relocation.size,
+                data.len()
+            ))
+        })
+    }
+
+    /// Write the object to a `Vec`.
+    pub fn write(&self) -> Result<Vec<u8>> {
+        let mut buffer = Vec::new();
+        self.emit(&mut buffer)?;
+        Ok(buffer)
+    }
+
+    /// Write the object to a `Write` implementation.
+    ///
+    /// Also flushes the writer.
+    ///
+    /// It is advisable to use a buffered writer like [`BufWriter`](std::io::BufWriter)
+    /// instead of an unbuffered writer like [`File`](std::fs::File).
+    #[cfg(feature = "std")]
+    pub fn write_stream<W: io::Write>(&self, w: W) -> result::Result<(), Box<dyn error::Error>> {
+        let mut stream = StreamingBuffer::new(w);
+        self.emit(&mut stream)?;
+        stream.result()?;
+        stream.into_inner().flush()?;
+        Ok(())
+    }
+
+    /// Write the object to a `WritableBuffer`.
+    pub fn emit(&self, buffer: &mut dyn WritableBuffer) -> Result<()> {
+        match self.format {
+            #[cfg(feature = "coff")]
+            BinaryFormat::Coff => self.coff_write(buffer),
+            #[cfg(feature = "elf")]
+            BinaryFormat::Elf => self.elf_write(buffer),
+            #[cfg(feature = "macho")]
+            BinaryFormat::MachO => self.macho_write(buffer),
+            #[cfg(feature = "xcoff")]
+            BinaryFormat::Xcoff => self.xcoff_write(buffer),
+            _ => unimplemented!(),
+        }
+    }
+}
+
+/// A standard segment kind.
+#[allow(missing_docs)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[non_exhaustive]
+pub enum StandardSegment {
+    Text,
+    Data,
+    Debug,
+}
+
+/// A standard section kind.
+#[allow(missing_docs)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[non_exhaustive]
+pub enum StandardSection {
+    Text,
+    Data,
+    ReadOnlyData,
+    ReadOnlyDataWithRel,
+    ReadOnlyString,
+    UninitializedData,
+    Tls,
+    /// Zero-fill TLS initializers. Unsupported for COFF.
+    UninitializedTls,
+    /// TLS variable structures. Only supported for Mach-O.
+    TlsVariables,
+    /// Common data. Only supported for Mach-O.
+    Common,
+    /// Notes for GNU properties. Only supported for ELF.
+    GnuProperty,
+}
+
+impl StandardSection {
+    /// Return the section kind of a standard section.
+    pub fn kind(self) -> SectionKind {
+        match self {
+            StandardSection::Text => SectionKind::Text,
+            StandardSection::Data => SectionKind::Data,
+            StandardSection::ReadOnlyData => SectionKind::ReadOnlyData,
+            StandardSection::ReadOnlyDataWithRel => SectionKind::ReadOnlyDataWithRel,
+            StandardSection::ReadOnlyString => SectionKind::ReadOnlyString,
+            StandardSection::UninitializedData => SectionKind::UninitializedData,
+            StandardSection::Tls => SectionKind::Tls,
+            StandardSection::UninitializedTls => SectionKind::UninitializedTls,
+            StandardSection::TlsVariables => SectionKind::TlsVariables,
+            StandardSection::Common => SectionKind::Common,
+            StandardSection::GnuProperty => SectionKind::Note,
+        }
+    }
+
+    // TODO: remembering to update this is error-prone, can we do better?
+    fn all() -> &'static [StandardSection] {
+        &[
+            StandardSection::Text,
+            StandardSection::Data,
+            StandardSection::ReadOnlyData,
+            StandardSection::ReadOnlyDataWithRel,
+            StandardSection::ReadOnlyString,
+            StandardSection::UninitializedData,
+            StandardSection::Tls,
+            StandardSection::UninitializedTls,
+            StandardSection::TlsVariables,
+            StandardSection::Common,
+            StandardSection::GnuProperty,
+        ]
+    }
+}
+
+/// An identifier used to reference a section.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct SectionId(usize);
+
+/// A section in an object file.
+#[derive(Debug)]
+pub struct Section<'a> {
+    segment: Vec<u8>,
+    name: Vec<u8>,
+    kind: SectionKind,
+    size: u64,
+    align: u64,
+    data: Cow<'a, [u8]>,
+    relocations: Vec<Relocation>,
+    symbol: Option<SymbolId>,
+    /// Section flags that are specific to each file format.
+    pub flags: SectionFlags,
+}
+
+impl<'a> Section<'a> {
+    /// Try to convert the name to a utf8 string.
+    #[inline]
+    pub fn name(&self) -> Option<&str> {
+        str::from_utf8(&self.name).ok()
+    }
+
+    /// Try to convert the segment to a utf8 string.
+    #[inline]
+    pub fn segment(&self) -> Option<&str> {
+        str::from_utf8(&self.segment).ok()
+    }
+
+    /// Return true if this section contains zerofill data.
+    #[inline]
+    pub fn is_bss(&self) -> bool {
+        self.kind.is_bss()
+    }
+
+    /// Set the data for a section.
+    ///
+    /// Must not be called for sections that already have data, or that contain uninitialized data.
+    pub fn set_data<T>(&mut self, data: T, align: u64)
+    where
+        T: Into<Cow<'a, [u8]>>,
+    {
+        debug_assert!(!self.is_bss());
+        debug_assert_eq!(align & (align - 1), 0);
+        debug_assert!(self.data.is_empty());
+        self.data = data.into();
+        self.size = self.data.len() as u64;
+        self.align = align;
+    }
+
+    /// Append data to a section.
+    ///
+    /// Must not be called for sections that contain uninitialized data.
+    pub fn append_data(&mut self, append_data: &[u8], align: u64) -> u64 {
+        debug_assert!(!self.is_bss());
+        debug_assert_eq!(align & (align - 1), 0);
+        if self.align < align {
+            self.align = align;
+        }
+        let align = align as usize;
+        let data = self.data.to_mut();
+        let mut offset = data.len();
+        if offset & (align - 1) != 0 {
+            offset += align - (offset & (align - 1));
+            data.resize(offset, 0);
+        }
+        data.extend_from_slice(append_data);
+        self.size = data.len() as u64;
+        offset as u64
+    }
+
+    /// Append uninitialized data to a section.
+    ///
+    /// Must not be called for sections that contain initialized data.
+    pub fn append_bss(&mut self, size: u64, align: u64) -> u64 {
+        debug_assert!(self.is_bss());
+        debug_assert_eq!(align & (align - 1), 0);
+        if self.align < align {
+            self.align = align;
+        }
+        let mut offset = self.size;
+        if offset & (align - 1) != 0 {
+            offset += align - (offset & (align - 1));
+            self.size = offset;
+        }
+        self.size += size;
+        offset
+    }
+
+    /// Returns the section as-built so far.
+    ///
+    /// This requires that the section is not a bss section.
+    pub fn data(&self) -> &[u8] {
+        debug_assert!(!self.is_bss());
+        &self.data
+    }
+
+    /// Returns the section as-built so far.
+    ///
+    /// This requires that the section is not a bss section.
+    pub fn data_mut(&mut self) -> &mut [u8] {
+        debug_assert!(!self.is_bss());
+        self.data.to_mut()
+    }
+}
+
+/// The section where a symbol is defined.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[non_exhaustive]
+pub enum SymbolSection {
+    /// The section is not applicable for this symbol (such as file symbols).
+    None,
+    /// The symbol is undefined.
+    Undefined,
+    /// The symbol has an absolute value.
+    Absolute,
+    /// The symbol is a zero-initialized symbol that will be combined with duplicate definitions.
+    Common,
+    /// The symbol is defined in the given section.
+    Section(SectionId),
+}
+
+impl SymbolSection {
+    /// Returns the section id for the section where the symbol is defined.
+    ///
+    /// May return `None` if the symbol is not defined in a section.
+    #[inline]
+    pub fn id(self) -> Option<SectionId> {
+        if let SymbolSection::Section(id) = self {
+            Some(id)
+        } else {
+            None
+        }
+    }
+}
+
+/// An identifier used to reference a symbol.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct SymbolId(usize);
+
+/// A symbol in an object file.
+#[derive(Debug)]
+pub struct Symbol {
+    /// The name of the symbol.
+    pub name: Vec<u8>,
+    /// The value of the symbol.
+    ///
+    /// If the symbol defined in a section, then this is the section offset of the symbol.
+    pub value: u64,
+    /// The size of the symbol.
+    pub size: u64,
+    /// The kind of the symbol.
+    pub kind: SymbolKind,
+    /// The scope of the symbol.
+    pub scope: SymbolScope,
+    /// Whether the symbol has weak binding.
+    pub weak: bool,
+    /// The section containing the symbol.
+    pub section: SymbolSection,
+    /// Symbol flags that are specific to each file format.
+    pub flags: SymbolFlags<SectionId, SymbolId>,
+}
+
+impl Symbol {
+    /// Try to convert the name to a utf8 string.
+    #[inline]
+    pub fn name(&self) -> Option<&str> {
+        str::from_utf8(&self.name).ok()
+    }
+
+    /// Return true if the symbol is undefined.
+    #[inline]
+    pub fn is_undefined(&self) -> bool {
+        self.section == SymbolSection::Undefined
+    }
+
+    /// Return true if the symbol is common data.
+    ///
+    /// Note: does not check for `SymbolSection::Section` with `SectionKind::Common`.
+    #[inline]
+    pub fn is_common(&self) -> bool {
+        self.section == SymbolSection::Common
+    }
+
+    /// Return true if the symbol scope is local.
+    #[inline]
+    pub fn is_local(&self) -> bool {
+        self.scope == SymbolScope::Compilation
+    }
+}
+
+/// A relocation in an object file.
+#[derive(Debug)]
+pub struct Relocation {
+    /// The section offset of the place of the relocation.
+    pub offset: u64,
+    /// The size in bits of the place of relocation.
+    pub size: u8,
+    /// The operation used to calculate the result of the relocation.
+    pub kind: RelocationKind,
+    /// Information about how the result of the relocation operation is encoded in the place.
+    pub encoding: RelocationEncoding,
+    /// The symbol referred to by the relocation.
+    ///
+    /// This may be a section symbol.
+    pub symbol: SymbolId,
+    /// The addend to use in the relocation calculation.
+    ///
+    /// This may be in addition to an implicit addend stored at the place of the relocation.
+    pub addend: i64,
+}
+
+/// An identifier used to reference a COMDAT section group.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct ComdatId(usize);
+
+/// A COMDAT section group.
+#[derive(Debug)]
+pub struct Comdat {
+    /// The COMDAT selection kind.
+    ///
+    /// This determines the way in which the linker resolves multiple definitions of the COMDAT
+    /// sections.
+    pub kind: ComdatKind,
+    /// The COMDAT symbol.
+    ///
+    /// If this symbol is referenced, then all sections in the group will be included by the
+    /// linker.
+    pub symbol: SymbolId,
+    /// The sections in the group.
+    pub sections: Vec<SectionId>,
+}
+
+/// The symbol name mangling scheme.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[non_exhaustive]
+pub enum Mangling {
+    /// No symbol mangling.
+    None,
+    /// Windows COFF symbol mangling.
+    Coff,
+    /// Windows COFF i386 symbol mangling.
+    CoffI386,
+    /// ELF symbol mangling.
+    Elf,
+    /// Mach-O symbol mangling.
+    MachO,
+    /// Xcoff symbol mangling.
+    Xcoff,
+}
+
+impl Mangling {
+    /// Return the default symboling mangling for the given format and architecture.
+    pub fn default(format: BinaryFormat, architecture: Architecture) -> Self {
+        match (format, architecture) {
+            (BinaryFormat::Coff, Architecture::I386) => Mangling::CoffI386,
+            (BinaryFormat::Coff, _) => Mangling::Coff,
+            (BinaryFormat::Elf, _) => Mangling::Elf,
+            (BinaryFormat::MachO, _) => Mangling::MachO,
+            (BinaryFormat::Xcoff, _) => Mangling::Xcoff,
+            _ => Mangling::None,
+        }
+    }
+
+    /// Return the prefix to use for global symbols.
+    pub fn global_prefix(self) -> Option<u8> {
+        match self {
+            Mangling::None | Mangling::Elf | Mangling::Coff | Mangling::Xcoff => None,
+            Mangling::CoffI386 | Mangling::MachO => Some(b'_'),
+        }
+    }
+}

vendor/object/src/write/pe.rs

@@ -0,0 +1,847 @@
+//! Helper for writing PE files.
+use alloc::string::String;
+use alloc::vec::Vec;
+use core::mem;
+
+use crate::endian::{LittleEndian as LE, *};
+use crate::pe;
+use crate::write::util;
+use crate::write::{Error, Result, WritableBuffer};
+
+/// A helper for writing PE files.
+///
+/// Writing uses a two phase approach. The first phase reserves file ranges and virtual
+/// address ranges for everything in the order that they will be written.
+///
+/// The second phase writes everything out in order. Thus the caller must ensure writing
+/// is in the same order that file ranges were reserved.
+#[allow(missing_debug_implementations)]
+pub struct Writer<'a> {
+    is_64: bool,
+    section_alignment: u32,
+    file_alignment: u32,
+
+    buffer: &'a mut dyn WritableBuffer,
+    len: u32,
+    virtual_len: u32,
+    headers_len: u32,
+
+    code_address: u32,
+    data_address: u32,
+    code_len: u32,
+    data_len: u32,
+    bss_len: u32,
+
+    nt_headers_offset: u32,
+    data_directories: Vec<DataDirectory>,
+    section_header_num: u16,
+    sections: Vec<Section>,
+
+    symbol_offset: u32,
+    symbol_num: u32,
+
+    reloc_blocks: Vec<RelocBlock>,
+    relocs: Vec<U16<LE>>,
+    reloc_offset: u32,
+}
+
+impl<'a> Writer<'a> {
+    /// Create a new `Writer`.
+    pub fn new(
+        is_64: bool,
+        section_alignment: u32,
+        file_alignment: u32,
+        buffer: &'a mut dyn WritableBuffer,
+    ) -> Self {
+        Writer {
+            is_64,
+            section_alignment,
+            file_alignment,
+
+            buffer,
+            len: 0,
+            virtual_len: 0,
+            headers_len: 0,
+
+            code_address: 0,
+            data_address: 0,
+            code_len: 0,
+            data_len: 0,
+            bss_len: 0,
+
+            nt_headers_offset: 0,
+            data_directories: Vec::new(),
+            section_header_num: 0,
+            sections: Vec::new(),
+
+            symbol_offset: 0,
+            symbol_num: 0,
+
+            reloc_blocks: Vec::new(),
+            relocs: Vec::new(),
+            reloc_offset: 0,
+        }
+    }
+
+    /// Return the current virtual address size that has been reserved.
+    ///
+    /// This is only valid after section headers have been reserved.
+    pub fn virtual_len(&self) -> u32 {
+        self.virtual_len
+    }
+
+    /// Reserve a virtual address range with the given size.
+    ///
+    /// The reserved length will be increased to match the section alignment.
+    ///
+    /// Returns the aligned offset of the start of the range.
+    pub fn reserve_virtual(&mut self, len: u32) -> u32 {
+        let offset = self.virtual_len;
+        self.virtual_len += len;
+        self.virtual_len = util::align_u32(self.virtual_len, self.section_alignment);
+        offset
+    }
+
+    /// Reserve up to the given virtual address.
+    ///
+    /// The reserved length will be increased to match the section alignment.
+    pub fn reserve_virtual_until(&mut self, address: u32) {
+        debug_assert!(self.virtual_len <= address);
+        self.virtual_len = util::align_u32(address, self.section_alignment);
+    }
+
+    /// Return the current file length that has been reserved.
+    pub fn reserved_len(&self) -> u32 {
+        self.len
+    }
+
+    /// Return the current file length that has been written.
+    #[allow(clippy::len_without_is_empty)]
+    pub fn len(&self) -> usize {
+        self.buffer.len()
+    }
+
+    /// Reserve a file range with the given size and starting alignment.
+    ///
+    /// Returns the aligned offset of the start of the range.
+    pub fn reserve(&mut self, len: u32, align_start: u32) -> u32 {
+        if len == 0 {
+            return self.len;
+        }
+        self.reserve_align(align_start);
+        let offset = self.len;
+        self.len += len;
+        offset
+    }
+
+    /// Reserve a file range with the given size and using the file alignment.
+    ///
+    /// Returns the aligned offset of the start of the range.
+    pub fn reserve_file(&mut self, len: u32) -> u32 {
+        self.reserve(len, self.file_alignment)
+    }
+
+    /// Write data.
+    pub fn write(&mut self, data: &[u8]) {
+        self.buffer.write_bytes(data);
+    }
+
+    /// Reserve alignment padding bytes.
+    pub fn reserve_align(&mut self, align_start: u32) {
+        self.len = util::align_u32(self.len, align_start);
+    }
+
+    /// Write alignment padding bytes.
+    pub fn write_align(&mut self, align_start: u32) {
+        util::write_align(self.buffer, align_start as usize);
+    }
+
+    /// Write padding up to the next multiple of file alignment.
+    pub fn write_file_align(&mut self) {
+        self.write_align(self.file_alignment);
+    }
+
+    /// Reserve the file range up to the given file offset.
+    pub fn reserve_until(&mut self, offset: u32) {
+        debug_assert!(self.len <= offset);
+        self.len = offset;
+    }
+
+    /// Write padding up to the given file offset.
+    pub fn pad_until(&mut self, offset: u32) {
+        debug_assert!(self.buffer.len() <= offset as usize);
+        self.buffer.resize(offset as usize);
+    }
+
+    /// Reserve the range for the DOS header.
+    ///
+    /// This must be at the start of the file.
+    ///
+    /// When writing, you may use `write_custom_dos_header` or `write_empty_dos_header`.
+    pub fn reserve_dos_header(&mut self) {
+        debug_assert_eq!(self.len, 0);
+        self.reserve(mem::size_of::<pe::ImageDosHeader>() as u32, 1);
+    }
+
+    /// Write a custom DOS header.
+    ///
+    /// This must be at the start of the file.
+    pub fn write_custom_dos_header(&mut self, dos_header: &pe::ImageDosHeader) -> Result<()> {
+        debug_assert_eq!(self.buffer.len(), 0);
+
+        // Start writing.
+        self.buffer
+            .reserve(self.len as usize)
+            .map_err(|_| Error(String::from("Cannot allocate buffer")))?;
+
+        self.buffer.write(dos_header);
+        Ok(())
+    }
+
+    /// Write the DOS header for a file without a stub.
+    ///
+    /// This must be at the start of the file.
+    ///
+    /// Uses default values for all fields.
+    pub fn write_empty_dos_header(&mut self) -> Result<()> {
+        self.write_custom_dos_header(&pe::ImageDosHeader {
+            e_magic: U16::new(LE, pe::IMAGE_DOS_SIGNATURE),
+            e_cblp: U16::new(LE, 0),
+            e_cp: U16::new(LE, 0),
+            e_crlc: U16::new(LE, 0),
+            e_cparhdr: U16::new(LE, 0),
+            e_minalloc: U16::new(LE, 0),
+            e_maxalloc: U16::new(LE, 0),
+            e_ss: U16::new(LE, 0),
+            e_sp: U16::new(LE, 0),
+            e_csum: U16::new(LE, 0),
+            e_ip: U16::new(LE, 0),
+            e_cs: U16::new(LE, 0),
+            e_lfarlc: U16::new(LE, 0),
+            e_ovno: U16::new(LE, 0),
+            e_res: [U16::new(LE, 0); 4],
+            e_oemid: U16::new(LE, 0),
+            e_oeminfo: U16::new(LE, 0),
+            e_res2: [U16::new(LE, 0); 10],
+            e_lfanew: U32::new(LE, self.nt_headers_offset),
+        })
+    }
+
+    /// Reserve a fixed DOS header and stub.
+    ///
+    /// Use `reserve_dos_header` and `reserve` if you need a custom stub.
+    pub fn reserve_dos_header_and_stub(&mut self) {
+        self.reserve_dos_header();
+        self.reserve(64, 1);
+    }
+
+    /// Write a fixed DOS header and stub.
+    ///
+    /// Use `write_custom_dos_header` and `write` if you need a custom stub.
+    pub fn write_dos_header_and_stub(&mut self) -> Result<()> {
+        self.write_custom_dos_header(&pe::ImageDosHeader {
+            e_magic: U16::new(LE, pe::IMAGE_DOS_SIGNATURE),
+            e_cblp: U16::new(LE, 0x90),
+            e_cp: U16::new(LE, 3),
+            e_crlc: U16::new(LE, 0),
+            e_cparhdr: U16::new(LE, 4),
+            e_minalloc: U16::new(LE, 0),
+            e_maxalloc: U16::new(LE, 0xffff),
+            e_ss: U16::new(LE, 0),
+            e_sp: U16::new(LE, 0xb8),
+            e_csum: U16::new(LE, 0),
+            e_ip: U16::new(LE, 0),
+            e_cs: U16::new(LE, 0),
+            e_lfarlc: U16::new(LE, 0x40),
+            e_ovno: U16::new(LE, 0),
+            e_res: [U16::new(LE, 0); 4],
+            e_oemid: U16::new(LE, 0),
+            e_oeminfo: U16::new(LE, 0),
+            e_res2: [U16::new(LE, 0); 10],
+            e_lfanew: U32::new(LE, self.nt_headers_offset),
+        })?;
+
+        #[rustfmt::skip]
+        self.buffer.write_bytes(&[
+            0x0e, 0x1f, 0xba, 0x0e, 0x00, 0xb4, 0x09, 0xcd,
+            0x21, 0xb8, 0x01, 0x4c, 0xcd, 0x21, 0x54, 0x68,
+            0x69, 0x73, 0x20, 0x70, 0x72, 0x6f, 0x67, 0x72,
+            0x61, 0x6d, 0x20, 0x63, 0x61, 0x6e, 0x6e, 0x6f,
+            0x74, 0x20, 0x62, 0x65, 0x20, 0x72, 0x75, 0x6e,
+            0x20, 0x69, 0x6e, 0x20, 0x44, 0x4f, 0x53, 0x20,
+            0x6d, 0x6f, 0x64, 0x65, 0x2e, 0x0d, 0x0d, 0x0a,
+            0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        ]);
+
+        Ok(())
+    }
+
+    fn nt_headers_size(&self) -> u32 {
+        if self.is_64 {
+            mem::size_of::<pe::ImageNtHeaders64>() as u32
+        } else {
+            mem::size_of::<pe::ImageNtHeaders32>() as u32
+        }
+    }
+
+    fn optional_header_size(&self) -> u32 {
+        let size = if self.is_64 {
+            mem::size_of::<pe::ImageOptionalHeader64>() as u32
+        } else {
+            mem::size_of::<pe::ImageOptionalHeader32>() as u32
+        };
+        size + self.data_directories.len() as u32 * mem::size_of::<pe::ImageDataDirectory>() as u32
+    }
+
+    /// Return the offset of the NT headers, if reserved.
+    pub fn nt_headers_offset(&self) -> u32 {
+        self.nt_headers_offset
+    }
+
+    /// Reserve the range for the NT headers.
+    pub fn reserve_nt_headers(&mut self, data_directory_num: usize) {
+        debug_assert_eq!(self.nt_headers_offset, 0);
+        self.nt_headers_offset = self.reserve(self.nt_headers_size(), 8);
+        self.data_directories = vec![DataDirectory::default(); data_directory_num];
+        self.reserve(
+            data_directory_num as u32 * mem::size_of::<pe::ImageDataDirectory>() as u32,
+            1,
+        );
+    }
+
+    /// Set the virtual address and size of a data directory.
+    pub fn set_data_directory(&mut self, index: usize, virtual_address: u32, size: u32) {
+        self.data_directories[index] = DataDirectory {
+            virtual_address,
+            size,
+        }
+    }
+
+    /// Write the NT headers.
+    pub fn write_nt_headers(&mut self, nt_headers: NtHeaders) {
+        self.pad_until(self.nt_headers_offset);
+        self.buffer.write(&U32::new(LE, pe::IMAGE_NT_SIGNATURE));
+        let file_header = pe::ImageFileHeader {
+            machine: U16::new(LE, nt_headers.machine),
+            number_of_sections: U16::new(LE, self.section_header_num),
+            time_date_stamp: U32::new(LE, nt_headers.time_date_stamp),
+            pointer_to_symbol_table: U32::new(LE, self.symbol_offset),
+            number_of_symbols: U32::new(LE, self.symbol_num),
+            size_of_optional_header: U16::new(LE, self.optional_header_size() as u16),
+            characteristics: U16::new(LE, nt_headers.characteristics),
+        };
+        self.buffer.write(&file_header);
+        if self.is_64 {
+            let optional_header = pe::ImageOptionalHeader64 {
+                magic: U16::new(LE, pe::IMAGE_NT_OPTIONAL_HDR64_MAGIC),
+                major_linker_version: nt_headers.major_linker_version,
+                minor_linker_version: nt_headers.minor_linker_version,
+                size_of_code: U32::new(LE, self.code_len),
+                size_of_initialized_data: U32::new(LE, self.data_len),
+                size_of_uninitialized_data: U32::new(LE, self.bss_len),
+                address_of_entry_point: U32::new(LE, nt_headers.address_of_entry_point),
+                base_of_code: U32::new(LE, self.code_address),
+                image_base: U64::new(LE, nt_headers.image_base),
+                section_alignment: U32::new(LE, self.section_alignment),
+                file_alignment: U32::new(LE, self.file_alignment),
+                major_operating_system_version: U16::new(
+                    LE,
+                    nt_headers.major_operating_system_version,
+                ),
+                minor_operating_system_version: U16::new(
+                    LE,
+                    nt_headers.minor_operating_system_version,
+                ),
+                major_image_version: U16::new(LE, nt_headers.major_image_version),
+                minor_image_version: U16::new(LE, nt_headers.minor_image_version),
+                major_subsystem_version: U16::new(LE, nt_headers.major_subsystem_version),
+                minor_subsystem_version: U16::new(LE, nt_headers.minor_subsystem_version),
+                win32_version_value: U32::new(LE, 0),
+                size_of_image: U32::new(LE, self.virtual_len),
+                size_of_headers: U32::new(LE, self.headers_len),
+                check_sum: U32::new(LE, 0),
+                subsystem: U16::new(LE, nt_headers.subsystem),
+                dll_characteristics: U16::new(LE, nt_headers.dll_characteristics),
+                size_of_stack_reserve: U64::new(LE, nt_headers.size_of_stack_reserve),
+                size_of_stack_commit: U64::new(LE, nt_headers.size_of_stack_commit),
+                size_of_heap_reserve: U64::new(LE, nt_headers.size_of_heap_reserve),
+                size_of_heap_commit: U64::new(LE, nt_headers.size_of_heap_commit),
+                loader_flags: U32::new(LE, 0),
+                number_of_rva_and_sizes: U32::new(LE, self.data_directories.len() as u32),
+            };
+            self.buffer.write(&optional_header);
+        } else {
+            let optional_header = pe::ImageOptionalHeader32 {
+                magic: U16::new(LE, pe::IMAGE_NT_OPTIONAL_HDR32_MAGIC),
+                major_linker_version: nt_headers.major_linker_version,
+                minor_linker_version: nt_headers.minor_linker_version,
+                size_of_code: U32::new(LE, self.code_len),
+                size_of_initialized_data: U32::new(LE, self.data_len),
+                size_of_uninitialized_data: U32::new(LE, self.bss_len),
+                address_of_entry_point: U32::new(LE, nt_headers.address_of_entry_point),
+                base_of_code: U32::new(LE, self.code_address),
+                base_of_data: U32::new(LE, self.data_address),
+                image_base: U32::new(LE, nt_headers.image_base as u32),
+                section_alignment: U32::new(LE, self.section_alignment),
+                file_alignment: U32::new(LE, self.file_alignment),
+                major_operating_system_version: U16::new(
+                    LE,
+                    nt_headers.major_operating_system_version,
+                ),
+                minor_operating_system_version: U16::new(
+                    LE,
+                    nt_headers.minor_operating_system_version,
+                ),
+                major_image_version: U16::new(LE, nt_headers.major_image_version),
+                minor_image_version: U16::new(LE, nt_headers.minor_image_version),
+                major_subsystem_version: U16::new(LE, nt_headers.major_subsystem_version),
+                minor_subsystem_version: U16::new(LE, nt_headers.minor_subsystem_version),
+                win32_version_value: U32::new(LE, 0),
+                size_of_image: U32::new(LE, self.virtual_len),
+                size_of_headers: U32::new(LE, self.headers_len),
+                check_sum: U32::new(LE, 0),
+                subsystem: U16::new(LE, nt_headers.subsystem),
+                dll_characteristics: U16::new(LE, nt_headers.dll_characteristics),
+                size_of_stack_reserve: U32::new(LE, nt_headers.size_of_stack_reserve as u32),
+                size_of_stack_commit: U32::new(LE, nt_headers.size_of_stack_commit as u32),
+                size_of_heap_reserve: U32::new(LE, nt_headers.size_of_heap_reserve as u32),
+                size_of_heap_commit: U32::new(LE, nt_headers.size_of_heap_commit as u32),
+                loader_flags: U32::new(LE, 0),
+                number_of_rva_and_sizes: U32::new(LE, self.data_directories.len() as u32),
+            };
+            self.buffer.write(&optional_header);
+        }
+
+        for dir in &self.data_directories {
+            self.buffer.write(&pe::ImageDataDirectory {
+                virtual_address: U32::new(LE, dir.virtual_address),
+                size: U32::new(LE, dir.size),
+            })
+        }
+    }
+
+    /// Reserve the section headers.
+    ///
+    /// The number of reserved section headers must be the same as the number of sections that
+    /// are later reserved.
+    // TODO: change this to a maximum number of sections?
+    pub fn reserve_section_headers(&mut self, section_header_num: u16) {
+        debug_assert_eq!(self.section_header_num, 0);
+        self.section_header_num = section_header_num;
+        self.reserve(
+            u32::from(section_header_num) * mem::size_of::<pe::ImageSectionHeader>() as u32,
+            1,
+        );
+        // Padding before sections must be included in headers_len.
+        self.reserve_align(self.file_alignment);
+        self.headers_len = self.len;
+        self.reserve_virtual(self.len);
+    }
+
+    /// Write the section headers.
+    ///
+    /// This uses information that was recorded when the sections were reserved.
+    pub fn write_section_headers(&mut self) {
+        debug_assert_eq!(self.section_header_num as usize, self.sections.len());
+        for section in &self.sections {
+            let section_header = pe::ImageSectionHeader {
+                name: section.name,
+                virtual_size: U32::new(LE, section.range.virtual_size),
+                virtual_address: U32::new(LE, section.range.virtual_address),
+                size_of_raw_data: U32::new(LE, section.range.file_size),
+                pointer_to_raw_data: U32::new(LE, section.range.file_offset),
+                pointer_to_relocations: U32::new(LE, 0),
+                pointer_to_linenumbers: U32::new(LE, 0),
+                number_of_relocations: U16::new(LE, 0),
+                number_of_linenumbers: U16::new(LE, 0),
+                characteristics: U32::new(LE, section.characteristics),
+            };
+            self.buffer.write(&section_header);
+        }
+    }
+
+    /// Reserve a section.
+    ///
+    /// Returns the file range and virtual address range that are reserved
+    /// for the section.
+    pub fn reserve_section(
+        &mut self,
+        name: [u8; 8],
+        characteristics: u32,
+        virtual_size: u32,
+        data_size: u32,
+    ) -> SectionRange {
+        let virtual_address = self.reserve_virtual(virtual_size);
+
+        // Padding after section must be included in section file size.
+        let file_size = util::align_u32(data_size, self.file_alignment);
+        let file_offset = if file_size != 0 {
+            self.reserve(file_size, self.file_alignment)
+        } else {
+            0
+        };
+
+        // Sizes in optional header use the virtual size with the file alignment.
+        let aligned_virtual_size = util::align_u32(virtual_size, self.file_alignment);
+        if characteristics & pe::IMAGE_SCN_CNT_CODE != 0 {
+            if self.code_address == 0 {
+                self.code_address = virtual_address;
+            }
+            self.code_len += aligned_virtual_size;
+        } else if characteristics & pe::IMAGE_SCN_CNT_INITIALIZED_DATA != 0 {
+            if self.data_address == 0 {
+                self.data_address = virtual_address;
+            }
+            self.data_len += aligned_virtual_size;
+        } else if characteristics & pe::IMAGE_SCN_CNT_UNINITIALIZED_DATA != 0 {
+            if self.data_address == 0 {
+                self.data_address = virtual_address;
+            }
+            self.bss_len += aligned_virtual_size;
+        }
+
+        let range = SectionRange {
+            virtual_address,
+            virtual_size,
+            file_offset,
+            file_size,
+        };
+        self.sections.push(Section {
+            name,
+            characteristics,
+            range,
+        });
+        range
+    }
+
+    /// Write the data for a section.
+    pub fn write_section(&mut self, offset: u32, data: &[u8]) {
+        if data.is_empty() {
+            return;
+        }
+        self.pad_until(offset);
+        self.write(data);
+        self.write_align(self.file_alignment);
+    }
+
+    /// Reserve a `.text` section.
+    ///
+    /// Contains executable code.
+    pub fn reserve_text_section(&mut self, size: u32) -> SectionRange {
+        self.reserve_section(
+            *b".text\0\0\0",
+            pe::IMAGE_SCN_CNT_CODE | pe::IMAGE_SCN_MEM_EXECUTE | pe::IMAGE_SCN_MEM_READ,
+            size,
+            size,
+        )
+    }
+
+    /// Reserve a `.data` section.
+    ///
+    /// Contains initialized data.
+    ///
+    /// May also contain uninitialized data if `virtual_size` is greater than `data_size`.
+    pub fn reserve_data_section(&mut self, virtual_size: u32, data_size: u32) -> SectionRange {
+        self.reserve_section(
+            *b".data\0\0\0",
+            pe::IMAGE_SCN_CNT_INITIALIZED_DATA | pe::IMAGE_SCN_MEM_READ | pe::IMAGE_SCN_MEM_WRITE,
+            virtual_size,
+            data_size,
+        )
+    }
+
+    /// Reserve a `.rdata` section.
+    ///
+    /// Contains read-only initialized data.
+    pub fn reserve_rdata_section(&mut self, size: u32) -> SectionRange {
+        self.reserve_section(
+            *b".rdata\0\0",
+            pe::IMAGE_SCN_CNT_INITIALIZED_DATA | pe::IMAGE_SCN_MEM_READ,
+            size,
+            size,
+        )
+    }
+
+    /// Reserve a `.bss` section.
+    ///
+    /// Contains uninitialized data.
+    pub fn reserve_bss_section(&mut self, size: u32) -> SectionRange {
+        self.reserve_section(
+            *b".bss\0\0\0\0",
+            pe::IMAGE_SCN_CNT_UNINITIALIZED_DATA | pe::IMAGE_SCN_MEM_READ | pe::IMAGE_SCN_MEM_WRITE,
+            size,
+            0,
+        )
+    }
+
+    /// Reserve an `.idata` section.
+    ///
+    /// Contains import tables. Note that it is permissible to store import tables in a different
+    /// section.
+    ///
+    /// This also sets the `pe::IMAGE_DIRECTORY_ENTRY_IMPORT` data directory.
+    pub fn reserve_idata_section(&mut self, size: u32) -> SectionRange {
+        let range = self.reserve_section(
+            *b".idata\0\0",
+            pe::IMAGE_SCN_CNT_INITIALIZED_DATA | pe::IMAGE_SCN_MEM_READ | pe::IMAGE_SCN_MEM_WRITE,
+            size,
+            size,
+        );
+        let dir = &mut self.data_directories[pe::IMAGE_DIRECTORY_ENTRY_IMPORT];
+        debug_assert_eq!(dir.virtual_address, 0);
+        *dir = DataDirectory {
+            virtual_address: range.virtual_address,
+            size,
+        };
+        range
+    }
+
+    /// Reserve an `.edata` section.
+    ///
+    /// Contains export tables.
+    ///
+    /// This also sets the `pe::IMAGE_DIRECTORY_ENTRY_EXPORT` data directory.
+    pub fn reserve_edata_section(&mut self, size: u32) -> SectionRange {
+        let range = self.reserve_section(
+            *b".edata\0\0",
+            pe::IMAGE_SCN_CNT_INITIALIZED_DATA | pe::IMAGE_SCN_MEM_READ,
+            size,
+            size,
+        );
+        let dir = &mut self.data_directories[pe::IMAGE_DIRECTORY_ENTRY_EXPORT];
+        debug_assert_eq!(dir.virtual_address, 0);
+        *dir = DataDirectory {
+            virtual_address: range.virtual_address,
+            size,
+        };
+        range
+    }
+
+    /// Reserve a `.pdata` section.
+    ///
+    /// Contains exception information.
+    ///
+    /// This also sets the `pe::IMAGE_DIRECTORY_ENTRY_EXCEPTION` data directory.
+    pub fn reserve_pdata_section(&mut self, size: u32) -> SectionRange {
+        let range = self.reserve_section(
+            *b".pdata\0\0",
+            pe::IMAGE_SCN_CNT_INITIALIZED_DATA | pe::IMAGE_SCN_MEM_READ,
+            size,
+            size,
+        );
+        let dir = &mut self.data_directories[pe::IMAGE_DIRECTORY_ENTRY_EXCEPTION];
+        debug_assert_eq!(dir.virtual_address, 0);
+        *dir = DataDirectory {
+            virtual_address: range.virtual_address,
+            size,
+        };
+        range
+    }
+
+    /// Reserve a `.xdata` section.
+    ///
+    /// Contains exception information.
+    pub fn reserve_xdata_section(&mut self, size: u32) -> SectionRange {
+        self.reserve_section(
+            *b".xdata\0\0",
+            pe::IMAGE_SCN_CNT_INITIALIZED_DATA | pe::IMAGE_SCN_MEM_READ,
+            size,
+            size,
+        )
+    }
+
+    /// Reserve a `.rsrc` section.
+    ///
+    /// Contains the resource directory.
+    ///
+    /// This also sets the `pe::IMAGE_DIRECTORY_ENTRY_RESOURCE` data directory.
+    pub fn reserve_rsrc_section(&mut self, size: u32) -> SectionRange {
+        let range = self.reserve_section(
+            *b".rsrc\0\0\0",
+            pe::IMAGE_SCN_CNT_INITIALIZED_DATA | pe::IMAGE_SCN_MEM_READ,
+            size,
+            size,
+        );
+        let dir = &mut self.data_directories[pe::IMAGE_DIRECTORY_ENTRY_RESOURCE];
+        debug_assert_eq!(dir.virtual_address, 0);
+        *dir = DataDirectory {
+            virtual_address: range.virtual_address,
+            size,
+        };
+        range
+    }
+
+    /// Add a base relocation.
+    ///
+    /// `typ` must be one of the `IMAGE_REL_BASED_*` constants.
+    pub fn add_reloc(&mut self, mut virtual_address: u32, typ: u16) {
+        let reloc = U16::new(LE, typ << 12 | (virtual_address & 0xfff) as u16);
+        virtual_address &= !0xfff;
+        if let Some(block) = self.reloc_blocks.last_mut() {
+            if block.virtual_address == virtual_address {
+                self.relocs.push(reloc);
+                block.count += 1;
+                return;
+            }
+            // Blocks must have an even number of relocations.
+            if block.count & 1 != 0 {
+                self.relocs.push(U16::new(LE, 0));
+                block.count += 1;
+            }
+            debug_assert!(block.virtual_address < virtual_address);
+        }
+        self.relocs.push(reloc);
+        self.reloc_blocks.push(RelocBlock {
+            virtual_address,
+            count: 1,
+        });
+    }
+
+    /// Return true if a base relocation has been added.
+    pub fn has_relocs(&mut self) -> bool {
+        !self.relocs.is_empty()
+    }
+
+    /// Reserve a `.reloc` section.
+    ///
+    /// This contains the base relocations that were added with `add_reloc`.
+    ///
+    /// This also sets the `pe::IMAGE_DIRECTORY_ENTRY_BASERELOC` data directory.
+    pub fn reserve_reloc_section(&mut self) -> SectionRange {
+        if let Some(block) = self.reloc_blocks.last_mut() {
+            // Blocks must have an even number of relocations.
+            if block.count & 1 != 0 {
+                self.relocs.push(U16::new(LE, 0));
+                block.count += 1;
+            }
+        }
+        let size = self.reloc_blocks.iter().map(RelocBlock::size).sum();
+        let range = self.reserve_section(
+            *b".reloc\0\0",
+            pe::IMAGE_SCN_CNT_INITIALIZED_DATA
+                | pe::IMAGE_SCN_MEM_READ
+                | pe::IMAGE_SCN_MEM_DISCARDABLE,
+            size,
+            size,
+        );
+        let dir = &mut self.data_directories[pe::IMAGE_DIRECTORY_ENTRY_BASERELOC];
+        debug_assert_eq!(dir.virtual_address, 0);
+        *dir = DataDirectory {
+            virtual_address: range.virtual_address,
+            size,
+        };
+        self.reloc_offset = range.file_offset;
+        range
+    }
+
+    /// Write a `.reloc` section.
+    ///
+    /// This contains the base relocations that were added with `add_reloc`.
+    pub fn write_reloc_section(&mut self) {
+        if self.reloc_offset == 0 {
+            return;
+        }
+        self.pad_until(self.reloc_offset);
+
+        let mut total = 0;
+        for block in &self.reloc_blocks {
+            self.buffer.write(&pe::ImageBaseRelocation {
+                virtual_address: U32::new(LE, block.virtual_address),
+                size_of_block: U32::new(LE, block.size()),
+            });
+            self.buffer
+                .write_slice(&self.relocs[total..][..block.count as usize]);
+            total += block.count as usize;
+        }
+        debug_assert_eq!(total, self.relocs.len());
+
+        self.write_align(self.file_alignment);
+    }
+
+    /// Reserve the certificate table.
+    ///
+    /// This also sets the `pe::IMAGE_DIRECTORY_ENTRY_SECURITY` data directory.
+    // TODO: reserve individual certificates
+    pub fn reserve_certificate_table(&mut self, size: u32) {
+        let size = util::align_u32(size, 8);
+        let offset = self.reserve(size, 8);
+        let dir = &mut self.data_directories[pe::IMAGE_DIRECTORY_ENTRY_SECURITY];
+        debug_assert_eq!(dir.virtual_address, 0);
+        *dir = DataDirectory {
+            virtual_address: offset,
+            size,
+        };
+    }
+
+    /// Write the certificate table.
+    // TODO: write individual certificates
+    pub fn write_certificate_table(&mut self, data: &[u8]) {
+        let dir = self.data_directories[pe::IMAGE_DIRECTORY_ENTRY_SECURITY];
+        self.pad_until(dir.virtual_address);
+        self.write(data);
+        self.pad_until(dir.virtual_address + dir.size);
+    }
+}
+
+/// Information required for writing [`pe::ImageNtHeaders32`] or [`pe::ImageNtHeaders64`].
+#[allow(missing_docs)]
+#[derive(Debug, Clone)]
+pub struct NtHeaders {
+    // ImageFileHeader
+    pub machine: u16,
+    pub time_date_stamp: u32,
+    pub characteristics: u16,
+    // ImageOptionalHeader
+    pub major_linker_version: u8,
+    pub minor_linker_version: u8,
+    pub address_of_entry_point: u32,
+    pub image_base: u64,
+    pub major_operating_system_version: u16,
+    pub minor_operating_system_version: u16,
+    pub major_image_version: u16,
+    pub minor_image_version: u16,
+    pub major_subsystem_version: u16,
+    pub minor_subsystem_version: u16,
+    pub subsystem: u16,
+    pub dll_characteristics: u16,
+    pub size_of_stack_reserve: u64,
+    pub size_of_stack_commit: u64,
+    pub size_of_heap_reserve: u64,
+    pub size_of_heap_commit: u64,
+}
+
+#[derive(Default, Clone, Copy)]
+struct DataDirectory {
+    virtual_address: u32,
+    size: u32,
+}
+
+/// Information required for writing [`pe::ImageSectionHeader`].
+#[allow(missing_docs)]
+#[derive(Debug, Clone)]
+pub struct Section {
+    pub name: [u8; pe::IMAGE_SIZEOF_SHORT_NAME],
+    pub characteristics: u32,
+    pub range: SectionRange,
+}
+
+/// The file range and virtual address range for a section.
+#[allow(missing_docs)]
+#[derive(Debug, Default, Clone, Copy)]
+pub struct SectionRange {
+    pub virtual_address: u32,
+    pub virtual_size: u32,
+    pub file_offset: u32,
+    pub file_size: u32,
+}
+
+struct RelocBlock {
+    virtual_address: u32,
+    count: u32,
+}
+
+impl RelocBlock {
+    fn size(&self) -> u32 {
+        mem::size_of::<pe::ImageBaseRelocation>() as u32 + self.count * mem::size_of::<u16>() as u32
+    }
+}

vendor/object/src/write/string.rs

@@ -0,0 +1,159 @@
+use alloc::vec::Vec;
+
+#[cfg(feature = "std")]
+type IndexSet<K> = indexmap::IndexSet<K>;
+#[cfg(not(feature = "std"))]
+type IndexSet<K> = indexmap::IndexSet<K, hashbrown::hash_map::DefaultHashBuilder>;
+
+/// An identifier for an entry in a string table.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct StringId(usize);
+
+#[derive(Debug, Default)]
+pub(crate) struct StringTable<'a> {
+    strings: IndexSet<&'a [u8]>,
+    offsets: Vec<usize>,
+}
+
+impl<'a> StringTable<'a> {
+    /// Add a string to the string table.
+    ///
+    /// Panics if the string table has already been written, or
+    /// if the string contains a null byte.
+    pub fn add(&mut self, string: &'a [u8]) -> StringId {
+        assert!(self.offsets.is_empty());
+        assert!(!string.contains(&0));
+        let id = self.strings.insert_full(string).0;
+        StringId(id)
+    }
+
+    /// Return the id of the given string.
+    ///
+    /// Panics if the string is not in the string table.
+    pub fn get_id(&self, string: &[u8]) -> StringId {
+        let id = self.strings.get_index_of(string).unwrap();
+        StringId(id)
+    }
+
+    /// Return the string for the given id.
+    ///
+    /// Panics if the string is not in the string table.
+    pub fn get_string(&self, id: StringId) -> &'a [u8] {
+        self.strings.get_index(id.0).unwrap()
+    }
+
+    /// Return the offset of the given string.
+    ///
+    /// Panics if the string table has not been written, or
+    /// if the string is not in the string table.
+    pub fn get_offset(&self, id: StringId) -> usize {
+        self.offsets[id.0]
+    }
+
+    /// Append the string table to the given `Vec`, and
+    /// calculate the list of string offsets.
+    ///
+    /// `base` is the initial string table offset. For example,
+    /// this should be 1 for ELF, to account for the initial
+    /// null byte (which must have been written by the caller).
+    pub fn write(&mut self, base: usize, w: &mut Vec<u8>) {
+        assert!(self.offsets.is_empty());
+
+        let mut ids: Vec<_> = (0..self.strings.len()).collect();
+        sort(&mut ids, 1, &self.strings);
+
+        self.offsets = vec![0; ids.len()];
+        let mut offset = base;
+        let mut previous = &[][..];
+        for id in ids {
+            let string = self.strings.get_index(id).unwrap();
+            if previous.ends_with(string) {
+                self.offsets[id] = offset - string.len() - 1;
+            } else {
+                self.offsets[id] = offset;
+                w.extend_from_slice(string);
+                w.push(0);
+                offset += string.len() + 1;
+                previous = string;
+            }
+        }
+    }
+}
+
+// Multi-key quicksort.
+//
+// Ordering is such that if a string is a suffix of at least one other string,
+// then it is placed immediately after one of those strings. That is:
+// - comparison starts at the end of the string
+// - shorter strings come later
+//
+// Based on the implementation in LLVM.
+fn sort(mut ids: &mut [usize], mut pos: usize, strings: &IndexSet<&[u8]>) {
+    loop {
+        if ids.len() <= 1 {
+            return;
+        }
+
+        let pivot = byte(ids[0], pos, strings);
+        let mut lower = 0;
+        let mut upper = ids.len();
+        let mut i = 1;
+        while i < upper {
+            let b = byte(ids[i], pos, strings);
+            if b > pivot {
+                ids.swap(lower, i);
+                lower += 1;
+                i += 1;
+            } else if b < pivot {
+                upper -= 1;
+                ids.swap(upper, i);
+            } else {
+                i += 1;
+            }
+        }
+
+        sort(&mut ids[..lower], pos, strings);
+        sort(&mut ids[upper..], pos, strings);
+
+        if pivot == 0 {
+            return;
+        }
+        ids = &mut ids[lower..upper];
+        pos += 1;
+    }
+}
+
+fn byte(id: usize, pos: usize, strings: &IndexSet<&[u8]>) -> u8 {
+    let string = strings.get_index(id).unwrap();
+    let len = string.len();
+    if len >= pos {
+        string[len - pos]
+    } else {
+        // We know the strings don't contain null bytes.
+        0
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn string_table() {
+        let mut table = StringTable::default();
+        let id0 = table.add(b"");
+        let id1 = table.add(b"foo");
+        let id2 = table.add(b"bar");
+        let id3 = table.add(b"foobar");
+
+        let mut data = Vec::new();
+        data.push(0);
+        table.write(1, &mut data);
+        assert_eq!(data, b"\0foobar\0foo\0");
+
+        assert_eq!(table.get_offset(id0), 11);
+        assert_eq!(table.get_offset(id1), 8);
+        assert_eq!(table.get_offset(id2), 4);
+        assert_eq!(table.get_offset(id3), 1);
+    }
+}

vendor/object/src/write/util.rs

@@ -0,0 +1,260 @@
+use alloc::vec::Vec;
+#[cfg(feature = "std")]
+use std::{io, mem};
+
+use crate::pod::{bytes_of, bytes_of_slice, Pod};
+
+/// Trait for writable buffer.
+#[allow(clippy::len_without_is_empty)]
+pub trait WritableBuffer {
+    /// Returns position/offset for data to be written at.
+    ///
+    /// Should only be used in debug assertions
+    fn len(&self) -> usize;
+
+    /// Reserves specified number of bytes in the buffer.
+    ///
+    /// This will be called exactly once before writing anything to the buffer,
+    /// and the given size is the exact total number of bytes that will be written.
+    fn reserve(&mut self, size: usize) -> Result<(), ()>;
+
+    /// Writes zero bytes at the end of the buffer until the buffer
+    /// has the specified length.
+    fn resize(&mut self, new_len: usize);
+
+    /// Writes the specified slice of bytes at the end of the buffer.
+    fn write_bytes(&mut self, val: &[u8]);
+
+    /// Writes the specified `Pod` type at the end of the buffer.
+    fn write_pod<T: Pod>(&mut self, val: &T)
+    where
+        Self: Sized,
+    {
+        self.write_bytes(bytes_of(val))
+    }
+
+    /// Writes the specified `Pod` slice at the end of the buffer.
+    fn write_pod_slice<T: Pod>(&mut self, val: &[T])
+    where
+        Self: Sized,
+    {
+        self.write_bytes(bytes_of_slice(val))
+    }
+}
+
+impl<'a> dyn WritableBuffer + 'a {
+    /// Writes the specified `Pod` type at the end of the buffer.
+    pub fn write<T: Pod>(&mut self, val: &T) {
+        self.write_bytes(bytes_of(val))
+    }
+
+    /// Writes the specified `Pod` slice at the end of the buffer.
+    pub fn write_slice<T: Pod>(&mut self, val: &[T]) {
+        self.write_bytes(bytes_of_slice(val))
+    }
+}
+
+impl WritableBuffer for Vec<u8> {
+    #[inline]
+    fn len(&self) -> usize {
+        self.len()
+    }
+
+    #[inline]
+    fn reserve(&mut self, size: usize) -> Result<(), ()> {
+        debug_assert!(self.is_empty());
+        self.reserve(size);
+        Ok(())
+    }
+
+    #[inline]
+    fn resize(&mut self, new_len: usize) {
+        debug_assert!(new_len >= self.len());
+        self.resize(new_len, 0);
+    }
+
+    #[inline]
+    fn write_bytes(&mut self, val: &[u8]) {
+        debug_assert!(self.len() + val.len() <= self.capacity());
+        self.extend_from_slice(val)
+    }
+}
+
+/// A [`WritableBuffer`] that streams data to a [`Write`](std::io::Write) implementation.
+///
+/// [`Self::result`] must be called to determine if an I/O error occurred during writing.
+///
+/// It is advisable to use a buffered writer like [`BufWriter`](std::io::BufWriter)
+/// instead of an unbuffered writer like [`File`](std::fs::File).
+#[cfg(feature = "std")]
+#[derive(Debug)]
+pub struct StreamingBuffer<W> {
+    writer: W,
+    len: usize,
+    result: Result<(), io::Error>,
+}
+
+#[cfg(feature = "std")]
+impl<W> StreamingBuffer<W> {
+    /// Create a new `StreamingBuffer` backed by the given writer.
+    pub fn new(writer: W) -> Self {
+        StreamingBuffer {
+            writer,
+            len: 0,
+            result: Ok(()),
+        }
+    }
+
+    /// Unwraps this [`StreamingBuffer`] giving back the original writer.
+    pub fn into_inner(self) -> W {
+        self.writer
+    }
+
+    /// Returns any error that occurred during writing.
+    pub fn result(&mut self) -> Result<(), io::Error> {
+        mem::replace(&mut self.result, Ok(()))
+    }
+}
+
+#[cfg(feature = "std")]
+impl<W: io::Write> WritableBuffer for StreamingBuffer<W> {
+    #[inline]
+    fn len(&self) -> usize {
+        self.len
+    }
+
+    #[inline]
+    fn reserve(&mut self, _size: usize) -> Result<(), ()> {
+        Ok(())
+    }
+
+    #[inline]
+    fn resize(&mut self, new_len: usize) {
+        debug_assert!(self.len <= new_len);
+        while self.len < new_len {
+            let write_amt = (new_len - self.len - 1) % 1024 + 1;
+            self.write_bytes(&[0; 1024][..write_amt]);
+        }
+    }
+
+    #[inline]
+    fn write_bytes(&mut self, val: &[u8]) {
+        if self.result.is_ok() {
+            self.result = self.writer.write_all(val);
+        }
+        self.len += val.len();
+    }
+}
+
+/// A trait for mutable byte slices.
+///
+/// It provides convenience methods for `Pod` types.
+pub(crate) trait BytesMut {
+    fn write_at<T: Pod>(self, offset: usize, val: &T) -> Result<(), ()>;
+}
+
+impl<'a> BytesMut for &'a mut [u8] {
+    #[inline]
+    fn write_at<T: Pod>(self, offset: usize, val: &T) -> Result<(), ()> {
+        let src = bytes_of(val);
+        let dest = self.get_mut(offset..).ok_or(())?;
+        let dest = dest.get_mut(..src.len()).ok_or(())?;
+        dest.copy_from_slice(src);
+        Ok(())
+    }
+}
+
+/// Write an unsigned number using the LEB128 encoding to a buffer.
+///
+/// Returns the number of bytes written.
+pub(crate) fn write_uleb128(buf: &mut Vec<u8>, mut val: u64) -> usize {
+    let mut len = 0;
+    loop {
+        let mut byte = (val & 0x7f) as u8;
+        val >>= 7;
+        let done = val == 0;
+        if !done {
+            byte |= 0x80;
+        }
+
+        buf.push(byte);
+        len += 1;
+
+        if done {
+            return len;
+        }
+    }
+}
+
+/// Write a signed number using the LEB128 encoding to a buffer.
+///
+/// Returns the number of bytes written.
+#[allow(dead_code)]
+pub(crate) fn write_sleb128(buf: &mut Vec<u8>, mut val: i64) -> usize {
+    let mut len = 0;
+    loop {
+        let mut byte = val as u8;
+        // Keep the sign bit for testing
+        val >>= 6;
+        let done = val == 0 || val == -1;
+        if done {
+            byte &= !0x80;
+        } else {
+            // Remove the sign bit
+            val >>= 1;
+            byte |= 0x80;
+        }
+
+        buf.push(byte);
+        len += 1;
+
+        if done {
+            return len;
+        }
+    }
+}
+
+pub(crate) fn align(offset: usize, size: usize) -> usize {
+    (offset + (size - 1)) & !(size - 1)
+}
+
+#[allow(dead_code)]
+pub(crate) fn align_u32(offset: u32, size: u32) -> u32 {
+    (offset + (size - 1)) & !(size - 1)
+}
+
+#[allow(dead_code)]
+pub(crate) fn align_u64(offset: u64, size: u64) -> u64 {
+    (offset + (size - 1)) & !(size - 1)
+}
+
+pub(crate) fn write_align(buffer: &mut dyn WritableBuffer, size: usize) {
+    let new_len = align(buffer.len(), size);
+    buffer.resize(new_len);
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn bytes_mut() {
+        let data = vec![0x01, 0x23, 0x45, 0x67];
+
+        let mut bytes = data.clone();
+        bytes.extend_from_slice(bytes_of(&u16::to_be(0x89ab)));
+        assert_eq!(bytes, [0x01, 0x23, 0x45, 0x67, 0x89, 0xab]);
+
+        let mut bytes = data.clone();
+        assert_eq!(bytes.write_at(0, &u16::to_be(0x89ab)), Ok(()));
+        assert_eq!(bytes, [0x89, 0xab, 0x45, 0x67]);
+
+        let mut bytes = data.clone();
+        assert_eq!(bytes.write_at(2, &u16::to_be(0x89ab)), Ok(()));
+        assert_eq!(bytes, [0x01, 0x23, 0x89, 0xab]);
+
+        assert_eq!(bytes.write_at(3, &u16::to_be(0x89ab)), Err(()));
+        assert_eq!(bytes.write_at(4, &u16::to_be(0x89ab)), Err(()));
+        assert_eq!(vec![].write_at(0, &u32::to_be(0x89ab)), Err(()));
+    }
+}

vendor/object/src/write/xcoff.rs

@@ -0,0 +1,556 @@
+use core::mem;
+
+use crate::endian::{BigEndian as BE, I16, U16, U32};
+use crate::write::string::*;
+use crate::write::util::*;
+use crate::write::*;
+
+use crate::{xcoff, AddressSize};
+
+#[derive(Default, Clone, Copy)]
+struct SectionOffsets {
+    address: u64,
+    data_offset: usize,
+    reloc_offset: usize,
+}
+
+#[derive(Default, Clone, Copy)]
+struct SymbolOffsets {
+    index: usize,
+    str_id: Option<StringId>,
+    aux_count: u8,
+    storage_class: u8,
+}
+
+impl<'a> Object<'a> {
+    pub(crate) fn xcoff_section_info(
+        &self,
+        section: StandardSection,
+    ) -> (&'static [u8], &'static [u8], SectionKind, SectionFlags) {
+        match section {
+            StandardSection::Text => (&[], &b".text"[..], SectionKind::Text, SectionFlags::None),
+            StandardSection::Data => (&[], &b".data"[..], SectionKind::Data, SectionFlags::None),
+            StandardSection::ReadOnlyData
+            | StandardSection::ReadOnlyDataWithRel
+            | StandardSection::ReadOnlyString => (
+                &[],
+                &b".rdata"[..],
+                SectionKind::ReadOnlyData,
+                SectionFlags::None,
+            ),
+            StandardSection::UninitializedData => (
+                &[],
+                &b".bss"[..],
+                SectionKind::UninitializedData,
+                SectionFlags::None,
+            ),
+            StandardSection::Tls => (&[], &b".tdata"[..], SectionKind::Tls, SectionFlags::None),
+            StandardSection::UninitializedTls => (
+                &[],
+                &b".tbss"[..],
+                SectionKind::UninitializedTls,
+                SectionFlags::None,
+            ),
+            StandardSection::TlsVariables => {
+                // Unsupported section.
+                (&[], &[], SectionKind::TlsVariables, SectionFlags::None)
+            }
+            StandardSection::Common => {
+                // Unsupported section.
+                (&[], &[], SectionKind::Common, SectionFlags::None)
+            }
+            StandardSection::GnuProperty => {
+                // Unsupported section.
+                (&[], &[], SectionKind::Note, SectionFlags::None)
+            }
+        }
+    }
+
+    pub(crate) fn xcoff_fixup_relocation(&mut self, relocation: &mut Relocation) -> i64 {
+        let constant = match relocation.kind {
+            RelocationKind::Relative => relocation.addend + 4,
+            _ => relocation.addend,
+        };
+        relocation.addend -= constant;
+        constant
+    }
+
+    pub(crate) fn xcoff_write(&self, buffer: &mut dyn WritableBuffer) -> Result<()> {
+        let is_64 = match self.architecture.address_size().unwrap() {
+            AddressSize::U8 | AddressSize::U16 | AddressSize::U32 => false,
+            AddressSize::U64 => true,
+        };
+
+        let (hdr_size, sechdr_size, rel_size, sym_size) = if is_64 {
+            (
+                mem::size_of::<xcoff::FileHeader64>(),
+                mem::size_of::<xcoff::SectionHeader64>(),
+                mem::size_of::<xcoff::Rel64>(),
+                mem::size_of::<xcoff::Symbol64>(),
+            )
+        } else {
+            (
+                mem::size_of::<xcoff::FileHeader32>(),
+                mem::size_of::<xcoff::SectionHeader32>(),
+                mem::size_of::<xcoff::Rel32>(),
+                mem::size_of::<xcoff::Symbol32>(),
+            )
+        };
+
+        // Calculate offsets and build strtab.
+        let mut offset = 0;
+        let mut strtab = StringTable::default();
+        // We place the shared address 0 immediately after the section header table.
+        let mut address = 0;
+
+        // XCOFF file header.
+        offset += hdr_size;
+        // Section headers.
+        offset += self.sections.len() * sechdr_size;
+
+        // Calculate size of section data.
+        let mut section_offsets = vec![SectionOffsets::default(); self.sections.len()];
+        for (index, section) in self.sections.iter().enumerate() {
+            let len = section.data.len();
+            let sectype = section.kind;
+            // Section address should be 0 for all sections except the .text, .data, and .bss sections.
+            if sectype == SectionKind::Data
+                || sectype == SectionKind::Text
+                || sectype == SectionKind::UninitializedData
+            {
+                section_offsets[index].address = address as u64;
+                address += len;
+                address = align(address, 4);
+            } else {
+                section_offsets[index].address = 0;
+            }
+            if len != 0 {
+                // Set the default section alignment as 4.
+                offset = align(offset, 4);
+                section_offsets[index].data_offset = offset;
+                offset += len;
+            } else {
+                section_offsets[index].data_offset = 0;
+            }
+        }
+
+        // Calculate size of relocations.
+        for (index, section) in self.sections.iter().enumerate() {
+            let count = section.relocations.len();
+            if count != 0 {
+                section_offsets[index].reloc_offset = offset;
+                offset += count * rel_size;
+            } else {
+                section_offsets[index].reloc_offset = 0;
+            }
+        }
+
+        // Calculate size of symbols.
+        let mut file_str_id = None;
+        let mut symbol_offsets = vec![SymbolOffsets::default(); self.symbols.len()];
+        let mut symtab_count = 0;
+        for (index, symbol) in self.symbols.iter().enumerate() {
+            symbol_offsets[index].index = symtab_count;
+            symtab_count += 1;
+
+            let storage_class = if let SymbolFlags::Xcoff { n_sclass, .. } = symbol.flags {
+                n_sclass
+            } else {
+                match symbol.kind {
+                    SymbolKind::Null => xcoff::C_NULL,
+                    SymbolKind::File => xcoff::C_FILE,
+                    SymbolKind::Text | SymbolKind::Data | SymbolKind::Tls => {
+                        if symbol.is_local() {
+                            xcoff::C_STAT
+                        } else if symbol.weak {
+                            xcoff::C_WEAKEXT
+                        } else {
+                            xcoff::C_EXT
+                        }
+                    }
+                    SymbolKind::Section | SymbolKind::Label | SymbolKind::Unknown => {
+                        return Err(Error(format!(
+                            "unimplemented symbol `{}` kind {:?}",
+                            symbol.name().unwrap_or(""),
+                            symbol.kind
+                        )));
+                    }
+                }
+            };
+            symbol_offsets[index].storage_class = storage_class;
+
+            if storage_class == xcoff::C_FILE {
+                if is_64 && file_str_id.is_none() {
+                    file_str_id = Some(strtab.add(b".file"));
+                }
+                if symbol.name.len() > 8 {
+                    symbol_offsets[index].str_id = Some(strtab.add(&symbol.name));
+                }
+            } else if is_64 || symbol.name.len() > 8 {
+                symbol_offsets[index].str_id = Some(strtab.add(&symbol.name));
+            }
+
+            symbol_offsets[index].aux_count = 0;
+            match storage_class {
+                xcoff::C_FILE => {
+                    symbol_offsets[index].aux_count = 1;
+                    symtab_count += 1;
+                }
+                xcoff::C_EXT | xcoff::C_WEAKEXT | xcoff::C_HIDEXT => {
+                    symbol_offsets[index].aux_count = 1;
+                    symtab_count += 1;
+                }
+                // TODO: support auxiliary entry for other types of symbol.
+                _ => {}
+            }
+        }
+        let symtab_offset = offset;
+        let symtab_len = symtab_count * sym_size;
+        offset += symtab_len;
+
+        // Calculate size of strtab.
+        let strtab_offset = offset;
+        let mut strtab_data = Vec::new();
+        // First 4 bytes of strtab are the length.
+        strtab.write(4, &mut strtab_data);
+        let strtab_len = strtab_data.len() + 4;
+        offset += strtab_len;
+
+        // Start writing.
+        buffer
+            .reserve(offset)
+            .map_err(|_| Error(String::from("Cannot allocate buffer")))?;
+
+        // Write file header.
+        if is_64 {
+            let header = xcoff::FileHeader64 {
+                f_magic: U16::new(BE, xcoff::MAGIC_64),
+                f_nscns: U16::new(BE, self.sections.len() as u16),
+                f_timdat: U32::new(BE, 0),
+                f_symptr: U64::new(BE, symtab_offset as u64),
+                f_nsyms: U32::new(BE, symtab_count as u32),
+                f_opthdr: U16::new(BE, 0),
+                f_flags: match self.flags {
+                    FileFlags::Xcoff { f_flags } => U16::new(BE, f_flags),
+                    _ => U16::default(),
+                },
+            };
+            buffer.write(&header);
+        } else {
+            let header = xcoff::FileHeader32 {
+                f_magic: U16::new(BE, xcoff::MAGIC_32),
+                f_nscns: U16::new(BE, self.sections.len() as u16),
+                f_timdat: U32::new(BE, 0),
+                f_symptr: U32::new(BE, symtab_offset as u32),
+                f_nsyms: U32::new(BE, symtab_count as u32),
+                f_opthdr: U16::new(BE, 0),
+                f_flags: match self.flags {
+                    FileFlags::Xcoff { f_flags } => U16::new(BE, f_flags),
+                    _ => U16::default(),
+                },
+            };
+            buffer.write(&header);
+        }
+
+        // Write section headers.
+        for (index, section) in self.sections.iter().enumerate() {
+            let mut sectname = [0; 8];
+            sectname
+                .get_mut(..section.name.len())
+                .ok_or_else(|| {
+                    Error(format!(
+                        "section name `{}` is too long",
+                        section.name().unwrap_or(""),
+                    ))
+                })?
+                .copy_from_slice(&section.name);
+            let flags = if let SectionFlags::Xcoff { s_flags } = section.flags {
+                s_flags
+            } else {
+                match section.kind {
+                    SectionKind::Text
+                    | SectionKind::ReadOnlyData
+                    | SectionKind::ReadOnlyString
+                    | SectionKind::ReadOnlyDataWithRel => xcoff::STYP_TEXT,
+                    SectionKind::Data => xcoff::STYP_DATA,
+                    SectionKind::UninitializedData => xcoff::STYP_BSS,
+                    SectionKind::Tls => xcoff::STYP_TDATA,
+                    SectionKind::UninitializedTls => xcoff::STYP_TBSS,
+                    SectionKind::OtherString => xcoff::STYP_INFO,
+                    SectionKind::Debug => xcoff::STYP_DEBUG,
+                    SectionKind::Other | SectionKind::Metadata => 0,
+                    SectionKind::Note
+                    | SectionKind::Linker
+                    | SectionKind::Common
+                    | SectionKind::Unknown
+                    | SectionKind::TlsVariables
+                    | SectionKind::Elf(_) => {
+                        return Err(Error(format!(
+                            "unimplemented section `{}` kind {:?}",
+                            section.name().unwrap_or(""),
+                            section.kind
+                        )));
+                    }
+                }
+                .into()
+            };
+            if is_64 {
+                let section_header = xcoff::SectionHeader64 {
+                    s_name: sectname,
+                    s_paddr: U64::new(BE, section_offsets[index].address),
+                    // This field has the same value as the s_paddr field.
+                    s_vaddr: U64::new(BE, section_offsets[index].address),
+                    s_size: U64::new(BE, section.data.len() as u64),
+                    s_scnptr: U64::new(BE, section_offsets[index].data_offset as u64),
+                    s_relptr: U64::new(BE, section_offsets[index].reloc_offset as u64),
+                    s_lnnoptr: U64::new(BE, 0),
+                    s_nreloc: U32::new(BE, section.relocations.len() as u32),
+                    s_nlnno: U32::new(BE, 0),
+                    s_flags: U32::new(BE, flags),
+                    s_reserve: U32::new(BE, 0),
+                };
+                buffer.write(&section_header);
+            } else {
+                let section_header = xcoff::SectionHeader32 {
+                    s_name: sectname,
+                    s_paddr: U32::new(BE, section_offsets[index].address as u32),
+                    // This field has the same value as the s_paddr field.
+                    s_vaddr: U32::new(BE, section_offsets[index].address as u32),
+                    s_size: U32::new(BE, section.data.len() as u32),
+                    s_scnptr: U32::new(BE, section_offsets[index].data_offset as u32),
+                    s_relptr: U32::new(BE, section_offsets[index].reloc_offset as u32),
+                    s_lnnoptr: U32::new(BE, 0),
+                    // TODO: If more than 65,534 relocation entries are required, the field
+                    // value will be 65535, and an STYP_OVRFLO section header will contain
+                    // the actual count of relocation entries in the s_paddr field.
+                    s_nreloc: U16::new(BE, section.relocations.len() as u16),
+                    s_nlnno: U16::new(BE, 0),
+                    s_flags: U32::new(BE, flags),
+                };
+                buffer.write(&section_header);
+            }
+        }
+
+        // Write section data.
+        for (index, section) in self.sections.iter().enumerate() {
+            let len = section.data.len();
+            if len != 0 {
+                write_align(buffer, 4);
+                debug_assert_eq!(section_offsets[index].data_offset, buffer.len());
+                buffer.write_bytes(&section.data);
+            }
+        }
+
+        // Write relocations.
+        for (index, section) in self.sections.iter().enumerate() {
+            if !section.relocations.is_empty() {
+                debug_assert_eq!(section_offsets[index].reloc_offset, buffer.len());
+                for reloc in &section.relocations {
+                    let rtype = match reloc.kind {
+                        RelocationKind::Absolute => xcoff::R_POS,
+                        RelocationKind::Relative => xcoff::R_REL,
+                        RelocationKind::Got => xcoff::R_TOC,
+                        RelocationKind::Xcoff(x) => x,
+                        _ => {
+                            return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                        }
+                    };
+                    if is_64 {
+                        let xcoff_rel = xcoff::Rel64 {
+                            r_vaddr: U64::new(BE, reloc.offset),
+                            r_symndx: U32::new(BE, symbol_offsets[reloc.symbol.0].index as u32),
+                            // Specifies the bit length of the relocatable reference minus one.
+                            r_rsize: (reloc.size - 1),
+                            r_rtype: rtype,
+                        };
+                        buffer.write(&xcoff_rel);
+                    } else {
+                        let xcoff_rel = xcoff::Rel32 {
+                            r_vaddr: U32::new(BE, reloc.offset as u32),
+                            r_symndx: U32::new(BE, symbol_offsets[reloc.symbol.0].index as u32),
+                            r_rsize: (reloc.size - 1),
+                            r_rtype: rtype,
+                        };
+                        buffer.write(&xcoff_rel);
+                    }
+                }
+            }
+        }
+
+        // Write symbols.
+        debug_assert_eq!(symtab_offset, buffer.len());
+        for (index, symbol) in self.symbols.iter().enumerate() {
+            let (n_value, section_kind) = if let SymbolSection::Section(id) = symbol.section {
+                (
+                    section_offsets[id.0].address + symbol.value,
+                    self.sections[id.0].kind,
+                )
+            } else {
+                (symbol.value, SectionKind::Unknown)
+            };
+            let n_scnum = match symbol.section {
+                SymbolSection::None => {
+                    debug_assert_eq!(symbol.kind, SymbolKind::File);
+                    xcoff::N_DEBUG
+                }
+                SymbolSection::Undefined | SymbolSection::Common => xcoff::N_UNDEF,
+                SymbolSection::Absolute => xcoff::N_ABS,
+                SymbolSection::Section(id) => id.0 as i16 + 1,
+            };
+            let n_sclass = symbol_offsets[index].storage_class;
+            let n_type = if (symbol.scope == SymbolScope::Linkage)
+                && (n_sclass == xcoff::C_EXT
+                    || n_sclass == xcoff::C_WEAKEXT
+                    || n_sclass == xcoff::C_HIDEXT)
+            {
+                xcoff::SYM_V_HIDDEN
+            } else {
+                0
+            };
+            let n_numaux = symbol_offsets[index].aux_count;
+            if is_64 {
+                let str_id = if n_sclass == xcoff::C_FILE {
+                    file_str_id.unwrap()
+                } else {
+                    symbol_offsets[index].str_id.unwrap()
+                };
+                let xcoff_sym = xcoff::Symbol64 {
+                    n_value: U64::new(BE, n_value),
+                    n_offset: U32::new(BE, strtab.get_offset(str_id) as u32),
+                    n_scnum: I16::new(BE, n_scnum),
+                    n_type: U16::new(BE, n_type),
+                    n_sclass,
+                    n_numaux,
+                };
+                buffer.write(&xcoff_sym);
+            } else {
+                let mut sym_name = [0; 8];
+                if n_sclass == xcoff::C_FILE {
+                    sym_name[..5].copy_from_slice(b".file");
+                } else if symbol.name.len() <= 8 {
+                    sym_name[..symbol.name.len()].copy_from_slice(&symbol.name[..]);
+                } else {
+                    let str_offset = strtab.get_offset(symbol_offsets[index].str_id.unwrap());
+                    sym_name[4..8].copy_from_slice(&u32::to_be_bytes(str_offset as u32));
+                }
+                let xcoff_sym = xcoff::Symbol32 {
+                    n_name: sym_name,
+                    n_value: U32::new(BE, n_value as u32),
+                    n_scnum: I16::new(BE, n_scnum),
+                    n_type: U16::new(BE, n_type),
+                    n_sclass,
+                    n_numaux,
+                };
+                buffer.write(&xcoff_sym);
+            }
+            // Generate auxiliary entries.
+            if n_sclass == xcoff::C_FILE {
+                debug_assert_eq!(n_numaux, 1);
+                let mut x_fname = [0; 8];
+                if symbol.name.len() <= 8 {
+                    x_fname[..symbol.name.len()].copy_from_slice(&symbol.name[..]);
+                } else {
+                    let str_offset = strtab.get_offset(symbol_offsets[index].str_id.unwrap());
+                    x_fname[4..8].copy_from_slice(&u32::to_be_bytes(str_offset as u32));
+                }
+                if is_64 {
+                    let file_aux = xcoff::FileAux64 {
+                        x_fname,
+                        x_fpad: Default::default(),
+                        x_ftype: xcoff::XFT_FN,
+                        x_freserve: Default::default(),
+                        x_auxtype: xcoff::AUX_FILE,
+                    };
+                    buffer.write(&file_aux);
+                } else {
+                    let file_aux = xcoff::FileAux32 {
+                        x_fname,
+                        x_fpad: Default::default(),
+                        x_ftype: xcoff::XFT_FN,
+                        x_freserve: Default::default(),
+                    };
+                    buffer.write(&file_aux);
+                }
+            } else if n_sclass == xcoff::C_EXT
+                || n_sclass == xcoff::C_WEAKEXT
+                || n_sclass == xcoff::C_HIDEXT
+            {
+                debug_assert_eq!(n_numaux, 1);
+                let (x_smtyp, x_smclas) = if let SymbolFlags::Xcoff {
+                    x_smtyp, x_smclas, ..
+                } = symbol.flags
+                {
+                    (x_smtyp, x_smclas)
+                } else {
+                    match symbol.kind {
+                        SymbolKind::Text => (xcoff::XTY_SD, xcoff::XMC_PR),
+                        SymbolKind::Data => {
+                            if section_kind == SectionKind::UninitializedData {
+                                (xcoff::XTY_CM, xcoff::XMC_BS)
+                            } else if section_kind == SectionKind::ReadOnlyData {
+                                (xcoff::XTY_SD, xcoff::XMC_RO)
+                            } else {
+                                (xcoff::XTY_SD, xcoff::XMC_RW)
+                            }
+                        }
+                        SymbolKind::Tls => {
+                            if section_kind == SectionKind::UninitializedTls {
+                                (xcoff::XTY_CM, xcoff::XMC_UL)
+                            } else {
+                                (xcoff::XTY_SD, xcoff::XMC_TL)
+                            }
+                        }
+                        _ => {
+                            return Err(Error(format!(
+                                "unimplemented symbol `{}` kind {:?}",
+                                symbol.name().unwrap_or(""),
+                                symbol.kind
+                            )));
+                        }
+                    }
+                };
+                let scnlen = if let SymbolFlags::Xcoff {
+                    containing_csect: Some(containing_csect),
+                    ..
+                } = symbol.flags
+                {
+                    symbol_offsets[containing_csect.0].index as u64
+                } else {
+                    symbol.size
+                };
+                if is_64 {
+                    let csect_aux = xcoff::CsectAux64 {
+                        x_scnlen_lo: U32::new(BE, (scnlen & 0xFFFFFFFF) as u32),
+                        x_scnlen_hi: U32::new(BE, ((scnlen >> 32) & 0xFFFFFFFF) as u32),
+                        x_parmhash: U32::new(BE, 0),
+                        x_snhash: U16::new(BE, 0),
+                        x_smtyp,
+                        x_smclas,
+                        pad: 0,
+                        x_auxtype: xcoff::AUX_CSECT,
+                    };
+                    buffer.write(&csect_aux);
+                } else {
+                    let csect_aux = xcoff::CsectAux32 {
+                        x_scnlen: U32::new(BE, scnlen as u32),
+                        x_parmhash: U32::new(BE, 0),
+                        x_snhash: U16::new(BE, 0),
+                        x_smtyp,
+                        x_smclas,
+                        x_stab: U32::new(BE, 0),
+                        x_snstab: U16::new(BE, 0),
+                    };
+                    buffer.write(&csect_aux);
+                }
+            }
+        }
+
+        // Write string table.
+        debug_assert_eq!(strtab_offset, buffer.len());
+        buffer.write_bytes(&u32::to_be_bytes(strtab_len as u32));
+        buffer.write_bytes(&strtab_data);
+
+        debug_assert_eq!(offset, buffer.len());
+        Ok(())
+    }
+}

vendor/object/src/xcoff.rs

@@ -0,0 +1,905 @@
+//! XCOFF definitions
+//!
+//! These definitions are independent of read/write support, although we do implement
+//! some traits useful for those.
+//!
+//! This module is the equivalent of /usr/include/xcoff.h, and is based heavily on it.
+
+#![allow(missing_docs)]
+
+use crate::endian::{BigEndian as BE, I16, U16, U32, U64};
+use crate::pod::Pod;
+
+/// The header at the start of every 32-bit XCOFF file.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct FileHeader32 {
+    /// Magic number. Must be 0x01DF.
+    pub f_magic: U16<BE>,
+    /// Number of sections.
+    pub f_nscns: U16<BE>,
+    /// Time and date of file creation.
+    pub f_timdat: U32<BE>,
+    /// Byte offset to symbol table start.
+    pub f_symptr: U32<BE>,
+    /// Number of entries in symbol table.
+    pub f_nsyms: U32<BE>,
+    /// Number of bytes in optional header
+    pub f_opthdr: U16<BE>,
+    /// Extra flags.
+    pub f_flags: U16<BE>,
+}
+
+/// The header at the start of every 64-bit XCOFF file.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct FileHeader64 {
+    /// Magic number. Must be 0x01F7.
+    pub f_magic: U16<BE>,
+    /// Number of sections.
+    pub f_nscns: U16<BE>,
+    /// Time and date of file creation
+    pub f_timdat: U32<BE>,
+    /// Byte offset to symbol table start.
+    pub f_symptr: U64<BE>,
+    /// Number of bytes in optional header
+    pub f_opthdr: U16<BE>,
+    /// Extra flags.
+    pub f_flags: U16<BE>,
+    /// Number of entries in symbol table.
+    pub f_nsyms: U32<BE>,
+}
+
+// Values for `f_magic`.
+//
+/// the 64-bit mach magic number
+pub const MAGIC_64: u16 = 0x01F7;
+/// the 32-bit mach magic number
+pub const MAGIC_32: u16 = 0x01DF;
+
+// Values for `f_flags`.
+//
+/// Indicates that the relocation information for binding has been removed from
+/// the file.
+pub const F_RELFLG: u16 = 0x0001;
+/// Indicates that the file is executable. No unresolved external references exist.
+pub const F_EXEC: u16 = 0x0002;
+/// Indicates that line numbers have been stripped from the file by a utility program.
+pub const F_LNNO: u16 = 0x0004;
+/// Indicates that the file was profiled with the fdpr command.
+pub const F_FDPR_PROF: u16 = 0x0010;
+/// Indicates that the file was reordered with the fdpr command.
+pub const F_FDPR_OPTI: u16 = 0x0020;
+/// Indicates that the file uses Very Large Program Support.
+pub const F_DSA: u16 = 0x0040;
+/// Indicates that one of the members of the auxiliary header specifying the
+/// medium page sizes is non-zero.
+pub const F_VARPG: u16 = 0x0100;
+/// Indicates the file is dynamically loadable and executable. External references
+/// are resolved by way of imports, and the file might contain exports and loader
+/// relocation.
+pub const F_DYNLOAD: u16 = 0x1000;
+/// Indicates the file is a shared object (shared library). The file is separately
+/// loadable. That is, it is not normally bound with other objects, and its loader
+/// exports symbols are used as automatic import symbols for other object files.
+pub const F_SHROBJ: u16 = 0x2000;
+/// If the object file is a member of an archive, it can be loaded by the system
+/// loader, but the member is ignored by the binder. If the object file is not in
+/// an archive, this flag has no effect.
+pub const F_LOADONLY: u16 = 0x4000;
+
+/// The auxiliary header immediately following file header. If the value of the
+/// f_opthdr field in the file header is 0, the auxiliary header does not exist.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct AuxHeader32 {
+    /// Flags.
+    pub o_mflag: U16<BE>,
+    /// Version.
+    pub o_vstamp: U16<BE>,
+    /// Text size in bytes.
+    pub o_tsize: U32<BE>,
+    /// Initialized data size in bytes.
+    pub o_dsize: U32<BE>,
+    /// Uninitialized data size in bytes.
+    pub o_bsize: U32<BE>,
+    /// Entry point descriptor (virtual address).
+    pub o_entry: U32<BE>,
+    /// Base address of text (virtual address).
+    pub o_text_start: U32<BE>,
+    /// Base address of data (virtual address).
+    pub o_data_start: U32<BE>,
+    /// Address of TOC anchor.
+    pub o_toc: U32<BE>,
+    /// Section number for entry point.
+    pub o_snentry: U16<BE>,
+    /// Section number for .text.
+    pub o_sntext: U16<BE>,
+    /// Section number for .data.
+    pub o_sndata: U16<BE>,
+    /// Section number for TOC.
+    pub o_sntoc: U16<BE>,
+    /// Section number for loader data.
+    pub o_snloader: U16<BE>,
+    /// Section number for .bss.
+    pub o_snbss: U16<BE>,
+    /// Maximum alignment for .text.
+    pub o_algntext: U16<BE>,
+    /// Maximum alignment for .data.
+    pub o_algndata: U16<BE>,
+    /// Module type field.
+    pub o_modtype: U16<BE>,
+    /// Bit flags - cpu types of objects.
+    pub o_cpuflag: u8,
+    /// Reserved for CPU type.
+    pub o_cputype: u8,
+    /// Maximum stack size allowed (bytes).
+    pub o_maxstack: U32<BE>,
+    /// Maximum data size allowed (bytes).
+    pub o_maxdata: U32<BE>,
+    /// Reserved for debuggers.
+    pub o_debugger: U32<BE>,
+    /// Requested text page size.
+    pub o_textpsize: u8,
+    /// Requested data page size.
+    pub o_datapsize: u8,
+    /// Requested stack page size.
+    pub o_stackpsize: u8,
+    /// Flags and thread-local storage alignment.
+    pub o_flags: u8,
+    /// Section number for .tdata.
+    pub o_sntdata: U16<BE>,
+    /// Section number for .tbss.
+    pub o_sntbss: U16<BE>,
+}
+
+/// The auxiliary header immediately following file header. If the value of the
+/// f_opthdr field in the file header is 0, the auxiliary header does not exist.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct AuxHeader64 {
+    /// Flags.
+    pub o_mflag: U16<BE>,
+    /// Version.
+    pub o_vstamp: U16<BE>,
+    /// Reserved for debuggers.
+    pub o_debugger: U32<BE>,
+    /// Base address of text (virtual address).
+    pub o_text_start: U64<BE>,
+    /// Base address of data (virtual address).
+    pub o_data_start: U64<BE>,
+    /// Address of TOC anchor.
+    pub o_toc: U64<BE>,
+    /// Section number for entry point.
+    pub o_snentry: U16<BE>,
+    /// Section number for .text.
+    pub o_sntext: U16<BE>,
+    /// Section number for .data.
+    pub o_sndata: U16<BE>,
+    /// Section number for TOC.
+    pub o_sntoc: U16<BE>,
+    /// Section number for loader data.
+    pub o_snloader: U16<BE>,
+    /// Section number for .bss.
+    pub o_snbss: U16<BE>,
+    /// Maximum alignment for .text.
+    pub o_algntext: U16<BE>,
+    /// Maximum alignment for .data.
+    pub o_algndata: U16<BE>,
+    /// Module type field.
+    pub o_modtype: U16<BE>,
+    /// Bit flags - cpu types of objects.
+    pub o_cpuflag: u8,
+    /// Reserved for CPU type.
+    pub o_cputype: u8,
+    /// Requested text page size.
+    pub o_textpsize: u8,
+    /// Requested data page size.
+    pub o_datapsize: u8,
+    /// Requested stack page size.
+    pub o_stackpsize: u8,
+    /// Flags and thread-local storage alignment.
+    pub o_flags: u8,
+    /// Text size in bytes.
+    pub o_tsize: U64<BE>,
+    /// Initialized data size in bytes.
+    pub o_dsize: U64<BE>,
+    /// Uninitialized data size in bytes.
+    pub o_bsize: U64<BE>,
+    /// Entry point descriptor (virtual address).
+    pub o_entry: U64<BE>,
+    /// Maximum stack size allowed (bytes).
+    pub o_maxstack: U64<BE>,
+    /// Maximum data size allowed (bytes).
+    pub o_maxdata: U64<BE>,
+    /// Section number for .tdata.
+    pub o_sntdata: U16<BE>,
+    /// Section number for .tbss.
+    pub o_sntbss: U16<BE>,
+    /// XCOFF64 flags.
+    pub o_x64flags: U16<BE>,
+    /// Reserved.
+    pub o_resv3a: U16<BE>,
+    /// Reserved.
+    pub o_resv3: [U32<BE>; 2],
+}
+
+/// Some AIX programs generate auxiliary headers for 32-bit object files that
+/// end after the data_start field.
+pub const AOUTHSZ_SHORT: u16 = 28;
+
+/// Section header.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct SectionHeader32 {
+    /// Section name.
+    pub s_name: [u8; 8],
+    /// Physical address.
+    pub s_paddr: U32<BE>,
+    /// Virtual address (same as physical address).
+    pub s_vaddr: U32<BE>,
+    /// Section size.
+    pub s_size: U32<BE>,
+    /// Offset in file to raw data for section.
+    pub s_scnptr: U32<BE>,
+    /// Offset in file to relocation entries for section.
+    pub s_relptr: U32<BE>,
+    /// Offset in file to line number entries for section.
+    pub s_lnnoptr: U32<BE>,
+    /// Number of relocation entries.
+    pub s_nreloc: U16<BE>,
+    /// Number of line number entries.
+    pub s_nlnno: U16<BE>,
+    /// Flags to define the section type.
+    pub s_flags: U32<BE>,
+}
+
+/// Section header.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct SectionHeader64 {
+    /// Section name.
+    pub s_name: [u8; 8],
+    /// Physical address.
+    pub s_paddr: U64<BE>,
+    /// Virtual address (same as physical address).
+    pub s_vaddr: U64<BE>,
+    /// Section size.
+    pub s_size: U64<BE>,
+    /// Offset in file to raw data for section.
+    pub s_scnptr: U64<BE>,
+    /// Offset in file to relocation entries for section.
+    pub s_relptr: U64<BE>,
+    /// Offset in file to line number entries for section.
+    pub s_lnnoptr: U64<BE>,
+    /// Number of relocation entries.
+    pub s_nreloc: U32<BE>,
+    /// Number of line number entries.
+    pub s_nlnno: U32<BE>,
+    /// Flags to define the section type.
+    pub s_flags: U32<BE>,
+    /// Reserved.
+    pub s_reserve: U32<BE>,
+}
+
+// Values for `s_flags`.
+//
+/// "regular" section
+pub const STYP_REG: u16 = 0x00;
+/// Specifies a pad section. A section of this type is used to provide alignment
+/// padding between sections within an XCOFF executable object file. This section
+/// header type is obsolete since padding is allowed in an XCOFF file without a
+/// corresponding pad section header.
+pub const STYP_PAD: u16 = 0x08;
+/// Specifies a DWARF debugging section, which provide source file and symbol
+/// information for the symbolic debugger.
+pub const STYP_DWARF: u16 = 0x10;
+/// Specifies an executable text (code) section. A section of this type contains
+/// the executable instructions of a program.
+pub const STYP_TEXT: u16 = 0x20;
+/// Specifies an initialized data section. A section of this type contains the
+/// initialized data and the TOC of a program.
+pub const STYP_DATA: u16 = 0x40;
+/// Specifies an uninitialized data section. A section header of this type
+/// defines the uninitialized data of a program.
+pub const STYP_BSS: u16 = 0x80;
+/// Specifies an exception section. A section of this type provides information
+/// to identify the reason that a trap or exception occurred within an executable
+/// object program.
+pub const STYP_EXCEPT: u16 = 0x0100;
+/// Specifies a comment section. A section of this type provides comments or data
+/// to special processing utility programs.
+pub const STYP_INFO: u16 = 0x0200;
+/// Specifies an initialized thread-local data section.
+pub const STYP_TDATA: u16 = 0x0400;
+/// Specifies an uninitialized thread-local data section.
+pub const STYP_TBSS: u16 = 0x0800;
+/// Specifies a loader section. A section of this type contains object file
+/// information for the system loader to load an XCOFF executable. The information
+/// includes imported symbols, exported symbols, relocation data, type-check
+/// information, and shared object names.
+pub const STYP_LOADER: u16 = 0x1000;
+/// Specifies a debug section. A section of this type contains stabstring
+/// information used by the symbolic debugger.
+pub const STYP_DEBUG: u16 = 0x2000;
+/// Specifies a type-check section. A section of this type contains
+/// parameter/argument type-check strings used by the binder.
+pub const STYP_TYPCHK: u16 = 0x4000;
+/// Specifies a relocation or line-number field overflow section. A section
+/// header of this type contains the count of relocation entries and line
+/// number entries for some other section. This section header is required
+/// when either of the counts exceeds 65,534.
+pub const STYP_OVRFLO: u16 = 0x8000;
+
+pub const SSUBTYP_DWINFO: u32 = 0x10000;
+pub const SSUBTYP_DWLINE: u32 = 0x20000;
+pub const SSUBTYP_DWPBNMS: u32 = 0x30000;
+pub const SSUBTYP_DWPBTYP: u32 = 0x40000;
+pub const SSUBTYP_DWARNGE: u32 = 0x50000;
+pub const SSUBTYP_DWABREV: u32 = 0x60000;
+pub const SSUBTYP_DWSTR: u32 = 0x70000;
+pub const SSUBTYP_DWRNGES: u32 = 0x80000;
+pub const SSUBTYP_DWLOC: u32 = 0x90000;
+pub const SSUBTYP_DWFRAME: u32 = 0xA0000;
+pub const SSUBTYP_DWMAC: u32 = 0xB0000;
+
+pub const SIZEOF_SYMBOL: usize = 18;
+
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct SymbolBytes(pub [u8; SIZEOF_SYMBOL]);
+
+/// Symbol table entry.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct Symbol32 {
+    /// Symbol name.
+    ///
+    /// If first 4 bytes are 0, then second 4 bytes are offset into string table.
+    pub n_name: [u8; 8],
+    /// Symbol value; storage class-dependent.
+    pub n_value: U32<BE>,
+    /// Section number of symbol.
+    pub n_scnum: I16<BE>,
+    /// Basic and derived type specification.
+    pub n_type: U16<BE>,
+    /// Storage class of symbol.
+    pub n_sclass: u8,
+    /// Number of auxiliary entries.
+    pub n_numaux: u8,
+}
+
+/// Symbol table entry.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct Symbol64 {
+    /// Symbol value; storage class-dependent.
+    pub n_value: U64<BE>,
+    /// Offset of the name in string table or .debug section.
+    pub n_offset: U32<BE>,
+    /// Section number of symbol.
+    pub n_scnum: I16<BE>,
+    /// Basic and derived type specification.
+    pub n_type: U16<BE>,
+    /// Storage class of symbol.
+    pub n_sclass: u8,
+    /// Number of auxiliary entries.
+    pub n_numaux: u8,
+}
+
+// Values for `n_scnum`.
+//
+/// A special symbolic debugging symbol.
+pub const N_DEBUG: i16 = -2;
+/// An absolute symbol. The symbol has a value but is not relocatable.
+pub const N_ABS: i16 = -1;
+/// An undefined external symbol.
+pub const N_UNDEF: i16 = 0;
+
+// Vlaues for `n_type`.
+//
+/// Values for visibility as they would appear when encoded in the high 4 bits
+/// of the 16-bit unsigned n_type field of symbol table entries. Valid for
+/// 32-bit XCOFF only when the o_vstamp in the auxiliary header is greater than 1.
+pub const SYM_V_MASK: u16 = 0xF000;
+pub const SYM_V_INTERNAL: u16 = 0x1000;
+pub const SYM_V_HIDDEN: u16 = 0x2000;
+pub const SYM_V_PROTECTED: u16 = 0x3000;
+pub const SYM_V_EXPORTED: u16 = 0x4000;
+
+// Values for `n_sclass`.
+//
+// Storage classes used for symbolic debugging symbols.
+//
+/// Source file name and compiler information.
+pub const C_FILE: u8 = 103;
+/// Beginning of include file.
+pub const C_BINCL: u8 = 108;
+/// Ending of include file.
+pub const C_EINCL: u8 = 109;
+/// Global variable.
+pub const C_GSYM: u8 = 128;
+/// Statically allocated symbol.
+pub const C_STSYM: u8 = 133;
+/// Beginning of common block.
+pub const C_BCOMM: u8 = 135;
+/// End of common block.
+pub const C_ECOMM: u8 = 137;
+/// Alternate entry.
+pub const C_ENTRY: u8 = 141;
+/// Beginning of static block.
+pub const C_BSTAT: u8 = 143;
+/// End of static block.
+pub const C_ESTAT: u8 = 144;
+/// Global thread-local variable.
+pub const C_GTLS: u8 = 145;
+/// Static thread-local variable.
+pub const C_STTLS: u8 = 146;
+/// DWARF section symbol.
+pub const C_DWARF: u8 = 112;
+//
+// Storage classes used for absolute symbols.
+//
+/// Automatic variable allocated on stack.
+pub const C_LSYM: u8 = 129;
+/// Argument to subroutine allocated on stack.
+pub const C_PSYM: u8 = 130;
+/// Register variable.
+pub const C_RSYM: u8 = 131;
+/// Argument to function or procedure stored in register.
+pub const C_RPSYM: u8 = 132;
+/// Local member of common block.
+pub const C_ECOML: u8 = 136;
+/// Function or procedure.
+pub const C_FUN: u8 = 142;
+//
+// Storage classes used for undefined external symbols or symbols of general sections.
+//
+/// External symbol.
+pub const C_EXT: u8 = 2;
+/// Weak external symbol.
+pub const C_WEAKEXT: u8 = 111;
+//
+// Storage classes used for symbols of general sections.
+//
+/// Symbol table entry marked for deletion.
+pub const C_NULL: u8 = 0;
+/// Static.
+pub const C_STAT: u8 = 3;
+/// Beginning or end of inner block.
+pub const C_BLOCK: u8 = 100;
+/// Beginning or end of function.
+pub const C_FCN: u8 = 101;
+/// Un-named external symbol.
+pub const C_HIDEXT: u8 = 107;
+/// Comment string in .info section.
+pub const C_INFO: u8 = 110;
+/// Declaration of object (type).
+pub const C_DECL: u8 = 140;
+//
+// Storage classes - Obsolete/Undocumented.
+//
+/// Automatic variable.
+pub const C_AUTO: u8 = 1;
+/// Register variable.
+pub const C_REG: u8 = 4;
+/// External definition.
+pub const C_EXTDEF: u8 = 5;
+/// Label.
+pub const C_LABEL: u8 = 6;
+/// Undefined label.
+pub const C_ULABEL: u8 = 7;
+/// Member of structure.
+pub const C_MOS: u8 = 8;
+/// Function argument.
+pub const C_ARG: u8 = 9;
+/// Structure tag.
+pub const C_STRTAG: u8 = 10;
+/// Member of union.
+pub const C_MOU: u8 = 11;
+/// Union tag.
+pub const C_UNTAG: u8 = 12;
+/// Type definition.
+pub const C_TPDEF: u8 = 13;
+/// Undefined static.
+pub const C_USTATIC: u8 = 14;
+/// Enumeration tag.
+pub const C_ENTAG: u8 = 15;
+/// Member of enumeration.
+pub const C_MOE: u8 = 16;
+/// Register parameter.
+pub const C_REGPARM: u8 = 17;
+/// Bit field.
+pub const C_FIELD: u8 = 18;
+/// End of structure.
+pub const C_EOS: u8 = 102;
+/// Duplicate tag.
+pub const C_ALIAS: u8 = 105;
+/// Special storage class for external.
+pub const C_HIDDEN: u8 = 106;
+/// Physical end of function.
+pub const C_EFCN: u8 = 255;
+/// Reserved.
+pub const C_TCSYM: u8 = 134;
+
+/// File Auxiliary Entry for C_FILE Symbols.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct FileAux32 {
+    /// The source file name or compiler-related string.
+    ///
+    /// If first 4 bytes are 0, then second 4 bytes are offset into string table.
+    pub x_fname: [u8; 8],
+    /// Pad size for file name.
+    pub x_fpad: [u8; 6],
+    /// The source-file string type.
+    pub x_ftype: u8,
+    /// Reserved.
+    pub x_freserve: [u8; 3],
+}
+
+/// File Auxiliary Entry for C_FILE Symbols.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct FileAux64 {
+    /// The source file name or compiler-related string.
+    ///
+    /// If first 4 bytes are 0, then second 4 bytes are offset into string table.
+    pub x_fname: [u8; 8],
+    /// Pad size for file name.
+    pub x_fpad: [u8; 6],
+    /// The source-file string type.
+    pub x_ftype: u8,
+    /// Reserved.
+    pub x_freserve: [u8; 2],
+    /// Specifies the type of auxiliary entry. Contains _AUX_FILE for this auxiliary entry.
+    pub x_auxtype: u8,
+}
+
+// Values for `x_ftype`.
+//
+/// Specifies the source-file name.
+pub const XFT_FN: u8 = 0;
+/// Specifies the compiler time stamp.
+pub const XFT_CT: u8 = 1;
+/// Specifies the compiler version number.
+pub const XFT_CV: u8 = 2;
+/// Specifies compiler-defined information.
+pub const XFT_CD: u8 = 128;
+
+/// Csect auxiliary entry for C_EXT, C_WEAKEXT, and C_HIDEXT symbols.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct CsectAux32 {
+    /// Section length.
+    pub x_scnlen: U32<BE>,
+    /// Offset of parameter type-check hash in .typchk section.
+    pub x_parmhash: U32<BE>,
+    /// .typchk section number.
+    pub x_snhash: U16<BE>,
+    /// Symbol alignment and type.
+    pub x_smtyp: u8,
+    /// Storage mapping class.
+    pub x_smclas: u8,
+    /// Reserved.
+    pub x_stab: U32<BE>,
+    /// x_snstab.
+    pub x_snstab: U16<BE>,
+}
+
+/// Csect auxiliary entry for C_EXT, C_WEAKEXT, and C_HIDEXT symbols.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct CsectAux64 {
+    /// Low 4 bytes of section length.
+    pub x_scnlen_lo: U32<BE>,
+    /// Offset of parameter type-check hash in .typchk section.
+    pub x_parmhash: U32<BE>,
+    /// .typchk section number.
+    pub x_snhash: U16<BE>,
+    /// Symbol alignment and type.
+    pub x_smtyp: u8,
+    /// Storage mapping class.
+    pub x_smclas: u8,
+    /// High 4 bytes of section length.
+    pub x_scnlen_hi: U32<BE>,
+    /// Reserved.
+    pub pad: u8,
+    /// Contains _AUX_CSECT; indicates type of auxiliary entry.
+    pub x_auxtype: u8,
+}
+
+// Values for `x_smtyp`.
+//
+/// External reference.
+pub const XTY_ER: u8 = 0;
+/// Csect definition for initialized storage.
+pub const XTY_SD: u8 = 1;
+/// Defines an entry point to an initialized csect.
+pub const XTY_LD: u8 = 2;
+/// Common csect definition. For uninitialized storage.
+pub const XTY_CM: u8 = 3;
+
+// Values for `x_smclas`.
+//
+// READ ONLY CLASSES
+//
+/// Program Code
+pub const XMC_PR: u8 = 0;
+/// Read Only Constant
+pub const XMC_RO: u8 = 1;
+/// Debug Dictionary Table
+pub const XMC_DB: u8 = 2;
+/// Global Linkage (Interfile Interface Code)
+pub const XMC_GL: u8 = 6;
+/// Extended Operation (Pseudo Machine Instruction)
+pub const XMC_XO: u8 = 7;
+/// Supervisor Call (32-bit process only)
+pub const XMC_SV: u8 = 8;
+/// Supervisor Call for 64-bit process
+pub const XMC_SV64: u8 = 17;
+/// Supervisor Call for both 32- and 64-bit processes
+pub const XMC_SV3264: u8 = 18;
+/// Traceback Index csect
+pub const XMC_TI: u8 = 12;
+/// Traceback Table csect
+pub const XMC_TB: u8 = 13;
+//
+// READ WRITE CLASSES
+//
+/// Read Write Data
+pub const XMC_RW: u8 = 5;
+/// TOC Anchor for TOC Addressability
+pub const XMC_TC0: u8 = 15;
+/// General TOC item
+pub const XMC_TC: u8 = 3;
+/// Scalar data item in the TOC
+pub const XMC_TD: u8 = 16;
+/// Descriptor csect
+pub const XMC_DS: u8 = 10;
+/// Unclassified - Treated as Read Write
+pub const XMC_UA: u8 = 4;
+/// BSS class (uninitialized static internal)
+pub const XMC_BS: u8 = 9;
+/// Un-named Fortran Common
+pub const XMC_UC: u8 = 11;
+/// Initialized thread-local variable
+pub const XMC_TL: u8 = 20;
+/// Uninitialized thread-local variable
+pub const XMC_UL: u8 = 21;
+/// Symbol mapped at the end of TOC
+pub const XMC_TE: u8 = 22;
+
+/// Function auxiliary entry.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct FunAux32 {
+    /// File offset to exception table entry.
+    pub x_exptr: U32<BE>,
+    /// Size of function in bytes.
+    pub x_fsize: U32<BE>,
+    /// File pointer to line number
+    pub x_lnnoptr: U32<BE>,
+    /// Symbol table index of next entry beyond this function.
+    pub x_endndx: U32<BE>,
+    /// Pad
+    pub pad: U16<BE>,
+}
+
+/// Function auxiliary entry.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct FunAux64 {
+    /// File pointer to line number
+    pub x_lnnoptr: U64<BE>,
+    /// Size of function in bytes.
+    pub x_fsize: U32<BE>,
+    /// Symbol table index of next entry beyond this function.
+    pub x_endndx: U32<BE>,
+    /// Pad
+    pub pad: u8,
+    /// Contains _AUX_FCN; Type of auxiliary entry.
+    pub x_auxtype: u8,
+}
+
+/// Exception auxiliary entry. (XCOFF64 only)
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct ExpAux {
+    /// File offset to exception table entry.
+    pub x_exptr: U64<BE>,
+    /// Size of function in bytes.
+    pub x_fsize: U32<BE>,
+    /// Symbol table index of next entry beyond this function.
+    pub x_endndx: U32<BE>,
+    /// Pad
+    pub pad: u8,
+    /// Contains _AUX_EXCEPT; Type of auxiliary entry
+    pub x_auxtype: u8,
+}
+
+/// Block auxiliary entry for the C_BLOCK and C_FCN Symbols.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct BlockAux32 {
+    /// Reserved.
+    pub pad: [u8; 2],
+    /// High-order 2 bytes of the source line number.
+    pub x_lnnohi: U16<BE>,
+    /// Low-order 2 bytes of the source line number.
+    pub x_lnnolo: U16<BE>,
+    /// Reserved.
+    pub pad2: [u8; 12],
+}
+
+/// Block auxiliary entry for the C_BLOCK and C_FCN Symbols.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct BlockAux64 {
+    /// Source line number.
+    pub x_lnno: U32<BE>,
+    /// Reserved.
+    pub pad: [u8; 13],
+    /// Contains _AUX_SYM; Type of auxiliary entry.
+    pub x_auxtype: u8,
+}
+
+/// Section auxiliary entry for the C_STAT Symbol. (XCOFF32 Only)
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct StatAux {
+    /// Section length.
+    pub x_scnlen: U32<BE>,
+    /// Number of relocation entries.
+    pub x_nreloc: U16<BE>,
+    /// Number of line numbers.
+    pub x_nlinno: U16<BE>,
+    /// Reserved.
+    pub pad: [u8; 10],
+}
+
+/// Section auxiliary entry Format for C_DWARF symbols.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct DwarfAux32 {
+    /// Length of portion of section represented by symbol.
+    pub x_scnlen: U32<BE>,
+    /// Reserved.
+    pub pad: [u8; 4],
+    /// Number of relocation entries in section.
+    pub x_nreloc: U32<BE>,
+    /// Reserved.
+    pub pad2: [u8; 6],
+}
+
+/// Section auxiliary entry Format for C_DWARF symbols.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct DwarfAux64 {
+    /// Length of portion of section represented by symbol.
+    pub x_scnlen: U64<BE>,
+    /// Number of relocation entries in section.
+    pub x_nreloc: U64<BE>,
+    /// Reserved.
+    pub pad: u8,
+    /// Contains _AUX_SECT; Type of Auxiliary entry.
+    pub x_auxtype: u8,
+}
+
+// Values for `x_auxtype`
+//
+/// Identifies an exception auxiliary entry.
+pub const AUX_EXCEPT: u8 = 255;
+/// Identifies a function auxiliary entry.
+pub const AUX_FCN: u8 = 254;
+/// Identifies a symbol auxiliary entry.
+pub const AUX_SYM: u8 = 253;
+/// Identifies a file auxiliary entry.
+pub const AUX_FILE: u8 = 252;
+/// Identifies a csect auxiliary entry.
+pub const AUX_CSECT: u8 = 251;
+/// Identifies a SECT auxiliary entry.
+pub const AUX_SECT: u8 = 250;
+
+/// Relocation table entry
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct Rel32 {
+    /// Virtual address (position) in section to be relocated.
+    pub r_vaddr: U32<BE>,
+    /// Symbol table index of item that is referenced.
+    pub r_symndx: U32<BE>,
+    /// Relocation size and information.
+    pub r_rsize: u8,
+    /// Relocation type.
+    pub r_rtype: u8,
+}
+
+/// Relocation table entry
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct Rel64 {
+    /// Virtual address (position) in section to be relocated.
+    pub r_vaddr: U64<BE>,
+    /// Symbol table index of item that is referenced.
+    pub r_symndx: U32<BE>,
+    /// Relocation size and information.
+    pub r_rsize: u8,
+    /// Relocation type.
+    pub r_rtype: u8,
+}
+
+// Values for `r_rtype`.
+//
+/// Positive relocation.
+pub const R_POS: u8 = 0x00;
+/// Positive indirect load relocation.
+pub const R_RL: u8 = 0x0c;
+/// Positive load address relocation. Modifiable instruction.
+pub const R_RLA: u8 = 0x0d;
+/// Negative relocation.
+pub const R_NEG: u8 = 0x01;
+/// Relative to self relocation.
+pub const R_REL: u8 = 0x02;
+/// Relative to the TOC relocation.
+pub const R_TOC: u8 = 0x03;
+/// TOC relative indirect load relocation.
+pub const R_TRL: u8 = 0x12;
+/// Relative to the TOC or to the thread-local storage base relocation.
+pub const R_TRLA: u8 = 0x13;
+/// Global linkage-external TOC address relocation.
+pub const R_GL: u8 = 0x05;
+/// Local object TOC address relocation.
+pub const R_TCL: u8 = 0x06;
+/// A non-relocating relocation.
+pub const R_REF: u8 = 0x0f;
+/// Branch absolute relocation. References a non-modifiable instruction.
+pub const R_BA: u8 = 0x08;
+/// Branch relative to self relocation. References a non-modifiable instruction.
+pub const R_BR: u8 = 0x0a;
+/// Branch absolute relocation. References a modifiable instruction.
+pub const R_RBA: u8 = 0x18;
+/// Branch relative to self relocation. References a modifiable instruction.
+pub const R_RBR: u8 = 0x1a;
+/// General-dynamic reference to TLS symbol.
+pub const R_TLS: u8 = 0x20;
+/// Initial-exec reference to TLS symbol.
+pub const R_TLS_IE: u8 = 0x21;
+/// Local-dynamic reference to TLS symbol.
+pub const R_TLS_LD: u8 = 0x22;
+/// Local-exec reference to TLS symbol.
+pub const R_TLS_LE: u8 = 0x23;
+/// Module reference to TLS.
+pub const R_TLSM: u8 = 0x24;
+/// Module reference to the local TLS storage.
+pub const R_TLSML: u8 = 0x25;
+/// Relative to TOC upper.
+pub const R_TOCU: u8 = 0x30;
+/// Relative to TOC lower.
+pub const R_TOCL: u8 = 0x31;
+
+unsafe_impl_pod!(
+    FileHeader32,
+    FileHeader64,
+    AuxHeader32,
+    AuxHeader64,
+    SectionHeader32,
+    SectionHeader64,
+    SymbolBytes,
+    Symbol32,
+    Symbol64,
+    FileAux32,
+    FileAux64,
+    CsectAux32,
+    CsectAux64,
+    FunAux32,
+    FunAux64,
+    ExpAux,
+    BlockAux32,
+    BlockAux64,
+    StatAux,
+    DwarfAux32,
+    DwarfAux64,
+    Rel32,
+    Rel64,
+);