Initial vendor packages

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

vendor/weezl/bin/lzw.rs

@@ -0,0 +1,159 @@
+#![forbid(unsafe_code)]
+use std::path::PathBuf;
+use std::{env, ffi, fs, io, process};
+
+extern crate weezl;
+use weezl::{decode as delzw, encode as enlzw, BitOrder};
+
+fn main() {
+    let args = env::args_os().skip(1);
+    let flags = Flags::from_args(args).unwrap_or_else(|ParamError| explain());
+
+    let out = io::stdout();
+    let out = out.lock();
+
+    let mut files = flags.files;
+    let input = files.pop().unwrap_or_else(explain);
+    if !files.is_empty() {
+        return explain();
+    }
+    let operation = flags.operation.unwrap_or_else(explain);
+    let min_code = if flags.min_code < 2 || flags.min_code > 12 {
+        return explain();
+    } else {
+        flags.min_code
+    };
+    let bit_order = flags.bit_order;
+
+    let result = match (input, operation) {
+        (Input::File(file), Operation::Encode) => (|| {
+            let data = fs::File::open(file)?;
+            let file = io::BufReader::with_capacity(1 << 26, data);
+
+            let mut encoder = enlzw::Encoder::new(bit_order, min_code);
+            encoder.into_stream(out).encode_all(file).status
+        })(),
+        (Input::Stdin, Operation::Encode) => {
+            let input = io::BufReader::with_capacity(1 << 26, io::stdin());
+            let mut encoder = enlzw::Encoder::new(bit_order, min_code);
+            encoder.into_stream(out).encode_all(input).status
+        }
+        (Input::File(file), Operation::Decode) => (|| {
+            let data = fs::File::open(file)?;
+            let file = io::BufReader::with_capacity(1 << 26, data);
+
+            let mut decoder = delzw::Decoder::new(bit_order, min_code);
+            decoder.into_stream(out).decode_all(file).status
+        })(),
+        (Input::Stdin, Operation::Decode) => {
+            let input = io::BufReader::with_capacity(1 << 26, io::stdin());
+            let mut decoder = delzw::Decoder::new(bit_order, min_code);
+            decoder.into_stream(out).decode_all(input).status
+        }
+    };
+
+    result.expect("Operation Failed: ");
+}
+
+struct Flags {
+    files: Vec<Input>,
+    operation: Option<Operation>,
+    min_code: u8,
+    bit_order: BitOrder,
+}
+
+struct ParamError;
+
+enum Input {
+    File(PathBuf),
+    Stdin,
+}
+
+enum Operation {
+    Encode,
+    Decode,
+}
+
+fn explain<T>() -> T {
+    println!(
+        "Usage: lzw [-e|-d] <file>\n\
+        Arguments:\n\
+        -e\t operation encode (default)\n\
+        -d\t operation decode\n\
+        <file>\tfilepath or '-' for stdin"
+    );
+    process::exit(1);
+}
+
+impl Default for Flags {
+    fn default() -> Flags {
+        Flags {
+            files: vec![],
+            operation: None,
+            min_code: 8,
+            bit_order: BitOrder::Msb,
+        }
+    }
+}
+
+impl Flags {
+    fn from_args(mut args: impl Iterator<Item = ffi::OsString>) -> Result<Self, ParamError> {
+        let mut flags = Flags::default();
+        let mut operation = None;
+        loop {
+            match args.next().as_ref().and_then(|s| s.to_str()) {
+                Some("-d") | Some("--decode") => {
+                    if operation.is_some() {
+                        return Err(ParamError);
+                    }
+                    operation = Some(Operation::Decode);
+                }
+                Some("-e") | Some("--encode") => {
+                    if operation.is_some() {
+                        return Err(ParamError);
+                    }
+                    operation = Some(Operation::Encode);
+                }
+                Some("-w") | Some("--word-bits") => match args.next() {
+                    None => return Err(ParamError),
+                    Some(bits) => {
+                        let st = bits.to_str().ok_or(ParamError)?;
+                        flags.min_code = st.parse().ok().ok_or(ParamError)?;
+                    }
+                },
+                Some("-le") | Some("--little-endian") => {
+                    flags.bit_order = BitOrder::Lsb;
+                }
+                Some("-be") | Some("--big-endian") | Some("-ne") | Some("--network-endian") => {
+                    flags.bit_order = BitOrder::Msb;
+                }
+                Some("-") => {
+                    flags.files.push(Input::Stdin);
+                }
+                Some(other) if other.starts_with('-') => {
+                    // Reserved for future use.
+                    // -a: self-describing archive format, similar to actual compress
+                    // -b: maximum bits
+                    // -v: verbosity
+                    // some compress compatibility mode? Probably through arg(0) though.
+                    return Err(ParamError);
+                }
+                Some(file) => {
+                    flags.files.push(Input::File(file.into()));
+                }
+                None => break,
+            };
+        }
+
+        flags.files.extend(args.map(|file| {
+            if let Some("-") = file.to_str() {
+                Input::Stdin
+            } else {
+                Input::File(file.into())
+            }
+        }));
+
+        flags.operation = operation;
+        Ok(flags)
+    }
+}