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NL unpacker

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This commit is contained in:
bird_egop 2024-11-17 15:54:59 +03:00
parent 3c47549fde
commit f2632ff583
2 changed files with 22 additions and 86 deletions
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1
NLUnpacker/NLUnpacker.csproj
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@ -5,6 +5,7 @@
<TargetFramework>net8.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
<AllowUnsafeBlocks>true</AllowUnsafeBlocks>
</PropertyGroup>
</Project>

101
NLUnpacker/Program.cs
View File

@ -1,93 +1,28 @@
using System.Buffers.Binary;
using System.Runtime.CompilerServices;
// ПОКА НЕ ПОНЯТНО КАК ОНО КОДИРУЕТСЯ
var fileBytes = File.ReadAllBytes("C:\\Program Files (x86)\\Nikita\\Iron Strategy\\gamefont.rlb");
// using var fs = new FileStream("gamefont.rlb", FileMode.Open, FileAccess.ReadWrite);
//
// int fileCount, c, i;
// byte b, n;
//
// fs.Seek(4, SeekOrigin.Current);
//
// Span<byte> buf2 = stackalloc byte[2];
// Span<byte> buf4 = stackalloc byte[4];
//
// fs.ReadExactly(buf2);
//
// fileCount = BinaryPrimitives.ReadInt16LittleEndian(buf2);
//
// fs.Seek(16 - 2, SeekOrigin.Current);
//
// b = (byte) fs.ReadByte();
// c = (byte) fs.ReadByte();
//
// fs.Seek(12 - 2, SeekOrigin.Current);
//
// Span<byte> buf1 = stackalloc byte[1];
//
// if (32 * fileCount > 0)
// {
// for (i = 0; i < 32 * fileCount; ++i)
// {
// b = (byte) ((b * 2) ^ c);
// n = (byte) c;
// c = (int) ((n >> 1) ^ b);
//
// // Read, modify, and write the byte at the current position
// byte originalByte = (byte) fs.ReadByte();
// fs.Seek(-1, SeekOrigin.Current); // Move back one byte to overwrite it
// buf1[0] = (byte) (originalByte ^ b);
// fs.Write(buf1);
// }
// }
var fileCount = BinaryPrimitives.ReadInt16LittleEndian(fileBytes.AsSpan().Slice(4, 2));
int v40 = 0;
var flags = 0;
var file_bytes = File.ReadAllBytes("gamefont.rlb");
var FileSize = file_bytes.Length;
var file_bytes_copy = file_bytes;
var v8 = flags;
if ((flags & 2) != 0)
{
if (file_bytes[FileSize - 6] != 'A' && file_bytes[FileSize - 5] != 'O')
throw new Exception("4");
v40 = BinaryPrimitives.ReadInt32LittleEndian(
file_bytes.Skip(FileSize - 4)
.Take(4)
.ToArray()
);
}
var decodedHeader = new byte[fileCount * 32];
if (file_bytes[0] != (byte)'N' || file_bytes[1] != (byte)'L' || file_bytes[2] != 0 || file_bytes[3] != 1)
throw new Exception("4");
var file_count = BinaryPrimitives.ReadInt16LittleEndian(
file_bytes.Skip(4)
.Take(2)
.ToArray()
);
var file_count_copy = file_count;
var section_mem_ptr = new byte[32 * file_count];
byte key1 = fileBytes[20];
byte key2 = fileBytes[21];
var decodeIndex = 0;
Console.WriteLine($"Keys: {key1} {key2}");
Console.WriteLine("Iteration " + decodeIndex.ToString("00") + "| " + string.Join(" ", decodedHeader.Take(20).Select(x => x.ToString("X2"))));
var section_count = 0;
var sixth_byte = file_bytes_copy[5];
var sixth_byte_shifted_by_1_byte = file_bytes_copy[5] >> 8;
if (32 * file_count > 0)
{
do
{
sixth_byte = (byte) (sixth_byte_shifted_by_1_byte ^ (2 * sixth_byte));
sixth_byte_shifted_by_1_byte = sixth_byte ^ (sixth_byte_shifted_by_1_byte >> 1);
section_mem_ptr[section_count] = (byte) (sixth_byte ^ file_bytes_copy[section_count + 32]);
++section_count;
} while (section_count < 32 * file_count);
v8 = flags;
}
key1 = (byte) (key2 ^ (key1 << 1));
key2 = (byte) (key1 ^ (key2 >> 1));
decodedHeader[decodeIndex] = (byte) (key1 ^ fileBytes[decodeIndex + 32]);
Console.WriteLine($"Keys: {key1} {key2}");
Console.WriteLine("Iteration " + decodeIndex.ToString("00") + "| " + string.Join(" ", decodedHeader.Take(20).Select(x => x.ToString("X2"))));
decodeIndex++;
} while (decodeIndex < fileCount * 32);
for (var i = 0; i < section_mem_ptr.Length; i++)
{
}
File.WriteAllBytes("gamefont-dump.rlb", file_bytes);
File.WriteAllBytes("encoding_table.bin", decodedHeader);