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[Blb3] Fixed some blocks parsing, some refactoring
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@yarik0chka
yarik0chka committed Jul 15, 2024
1 parent 50d481b commit 72a4c3c
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Showing 3 changed files with 50 additions and 89 deletions.
5 changes: 4 additions & 1 deletion AssetStudio.GUI/Studio.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -173,7 +173,10 @@ private static int ExtractBlockFile(FileReader reader, string savePath)
var subSavePath = Path.Combine(savePath, reader.FileName + "_unpacked");
var dummyPath = Path.Combine(reader.FullPath, stream.AbsolutePosition.ToString("X8"));
var subReader = new FileReader(dummyPath, stream, true);
total += ExtractBundleFile(subReader, subSavePath);
if (subReader.FileType == FileType.Blb3File)
total += ExtractBlb3File(subReader, subSavePath);
else
total += ExtractBundleFile(subReader, subSavePath);
} while (stream.Remaining > 0);
return total;
}
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77 changes: 40 additions & 37 deletions AssetStudio/BlbFile.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,6 @@ public class Blb3File
private byte[] Header;

private static string ModuleName = "UnityPlayer.dll";
private static IntPtr Module = IntPtr.Zero;

public BundleFile.Header m_Header;
public List<StreamFile> fileList;
Expand All @@ -27,35 +26,36 @@ public class Blb3File

[DllImport("kernel32.dll")]
static extern IntPtr LoadLibrary(string lpFileName);

[DllImport("kernel32.dll")]
static extern IntPtr GetModuleHandle(string lpModuleName);

public delegate int DecryptBlb(ref byte buffer, ulong size, ref byte header, ulong headerSize, uint idk);

private delegate int DecryptBlb(ref byte buffer, ulong size, ref byte header, ulong headerSize, uint idk);

private static DecryptBlb _decrypt;

public static void Decrypt(byte[] header, Span<byte> buffer)
{
if (Module == IntPtr.Zero)
if (_decrypt == null)
{
Module = LoadLibrary(ModuleName);
var module = LoadLibrary(ModuleName);

byte[] key1 = new byte[256] { 0x63, 0x7d, 0x75, 0x78, 0xf6, 0x6e, 0x69, 0xc2, 0x38, 0x08, 0x6d, 0x20, 0xf2, 0xda, 0xa5, 0x79, 0xda, 0x93, 0xdb, 0x6e, 0xee, 0x4c, 0x51, 0xe7, 0xb5, 0xcd, 0xb8, 0xb4, 0x80, 0xb9, 0x6c, 0xdf, 0x97, 0xdc, 0xb1, 0x05, 0x12, 0x1a, 0xd1, 0xeb, 0x1c, 0x8c, 0xcf, 0xda, 0x5d, 0xf5, 0x1f, 0x3a, 0x34, 0xf6, 0x11, 0xf0, 0x2c, 0xa3, 0x33, 0xad, 0x3f, 0x2b, 0xba, 0xd9, 0xd7, 0x1a, 0x8c, 0x4a, 0x49, 0xc2, 0x6e, 0x59, 0x5f, 0x2b, 0x1c, 0xe7, 0x1a, 0x72, 0x9c, 0xf8, 0x65, 0xae, 0x61, 0xcb, 0x03, 0x80, 0x52, 0xbe, 0x74, 0xa9, 0xe7, 0x0c, 0x32, 0x92, 0xe4, 0x62, 0x16, 0x11, 0x06, 0x90, 0xb0, 0x8e, 0xc8, 0x98, 0x27, 0x28, 0x55, 0xe2, 0x2d, 0x90, 0x68, 0x14, 0x3c, 0x51, 0xf1, 0xc7, 0x21, 0xd2, 0x32, 0xfc, 0xe6, 0xe8, 0x4e, 0x82, 0xc4, 0xcf, 0xa0, 0x5a, 0x6c, 0x82, 0x8d, 0xad, 0x4d, 0x8d, 0x91, 0x6f, 0xdb, 0x12, 0xc2, 0x90, 0x4c, 0x2e, 0xf4, 0xb6, 0xe8, 0xd0, 0x97, 0xfc, 0xf0, 0x10, 0xdd, 0x4f, 0xb6, 0xbf, 0x06, 0x1f, 0xde, 0x77, 0x22, 0x8f, 0x42, 0xc3, 0x95, 0x44, 0x40, 0x93, 0x98, 0xa9, 0xed, 0xa3, 0x82, 0xfb, 0x6a, 0x7a, 0x06, 0xc9, 0x3d, 0x38, 0x4a, 0xd6, 0x57, 0x79, 0x85, 0xde, 0x39, 0x60, 0xf8, 0x1e, 0xd4, 0xef, 0x4e, 0x51, 0xd9, 0xc7, 0x10, 0xb7, 0x7a, 0xb9, 0xe7, 0xed, 0xd8, 0x63, 0x72, 0x01, 0x20, 0x14, 0xbe, 0xd4, 0x87, 0x70, 0x45, 0x45, 0xa0, 0xef, 0x67, 0xb5, 0x9c, 0xd6, 0x20, 0xd9, 0xb9, 0xec, 0x8d, 0x62, 0x5a, 0x1c, 0xc3, 0x41, 0x01, 0x19, 0x7a, 0xf2, 0x8d, 0x3c, 0x68, 0x73, 0x73, 0xf7, 0x6d, 0x02, 0x22, 0xb8, 0xc6, 0x30, 0x7c, 0x50, 0x7b, 0xfe, 0x4b, 0x13, 0xb4, 0x9f, 0xb9, 0x60, 0xd7, 0xf4, 0x4c, 0xa9, 0x45, 0xe9 };
byte[] key2 = new byte[256] { 0x29, 0x23, 0xbe, 0x84, 0xe1, 0x6c, 0xd6, 0xae, 0x52, 0x90, 0x49, 0xf1, 0xf1, 0xbb, 0xe9, 0xeb, 0xb3, 0xa6, 0xdb, 0x3c, 0x87, 0x0c, 0x3e, 0x99, 0x24, 0x5e, 0x0d, 0x1c, 0x06, 0xb7, 0x47, 0xde, 0xb3, 0x12, 0x4d, 0xc8, 0x43, 0xbb, 0x8b, 0xa6, 0x1f, 0x03, 0x5a, 0x7d, 0x09, 0x38, 0x25, 0x1f, 0x5d, 0xd4, 0xcb, 0xfc, 0x96, 0xf5, 0x45, 0x3b, 0x13, 0x0d, 0x89, 0x0a, 0x1c, 0xdb, 0xae, 0x32, 0x20, 0x9a, 0x50, 0xee, 0x40, 0x78, 0x36, 0xfd, 0x12, 0x49, 0x32, 0xf6, 0x9e, 0x7d, 0x49, 0xdc, 0xad, 0x4f, 0x14, 0xf2, 0x44, 0x40, 0x66, 0xd0, 0x6b, 0xc4, 0x30, 0xb7, 0x32, 0x3b, 0xa1, 0x22, 0xf6, 0x22, 0x91, 0x9d, 0xe1, 0x8b, 0x1f, 0xda, 0xb0, 0xca, 0x99, 0x02, 0xb9, 0x72, 0x9d, 0x49, 0x2c, 0x80, 0x7e, 0xc5, 0x99, 0xd5, 0xe9, 0x80, 0xb2, 0xea, 0xc9, 0xcc, 0x53, 0xbf, 0x67, 0xd6, 0xbf, 0x14, 0xd6, 0x7e, 0x2d, 0xdc, 0x8e, 0x66, 0x83, 0xef, 0x57, 0x49, 0x61, 0xff, 0x69, 0x8f, 0x61, 0xcd, 0xd1, 0x1e, 0x9d, 0x9c, 0x16, 0x72, 0x72, 0xe6, 0x1d, 0xf0, 0x84, 0x4f, 0x4a, 0x77, 0x02, 0xd7, 0xe8, 0x39, 0x2c, 0x53, 0xcb, 0xc9, 0x12, 0x1e, 0x33, 0x74, 0x9e, 0x0c, 0xf4, 0xd5, 0xd4, 0x9f, 0xd4, 0xa4, 0x59, 0x7e, 0x35, 0xcf, 0x32, 0x22, 0xf4, 0xcc, 0xcf, 0xd3, 0x90, 0x2d, 0x48, 0xd3, 0x8f, 0x75, 0xe6, 0xd9, 0x1d, 0x2a, 0xe5, 0xc0, 0xf7, 0x2b, 0x78, 0x81, 0x87, 0x44, 0x0e, 0x5f, 0x50, 0x00, 0xd4, 0x61, 0x8d, 0xbe, 0x7b, 0x05, 0x15, 0x07, 0x3b, 0x33, 0x82, 0x1f, 0x18, 0x70, 0x92, 0xda, 0x64, 0x54, 0xce, 0xb1, 0x85, 0x3e, 0x69, 0x15, 0xf8, 0x46, 0x6a, 0x04, 0x96, 0x73, 0x0e, 0xd9, 0x16, 0x2f, 0x67, 0x68, 0xd4, 0xf7, 0x4a, 0x4a, 0xd0, 0x57, 0x68, 0x76 };

IntPtr key1Ptr = GetModuleHandle(ModuleName) + 0x1FF7090;
IntPtr key2Ptr = GetModuleHandle(ModuleName) + 0x1FF6F90;
IntPtr key1Ptr = module + 0x1FF7090;
IntPtr key2Ptr = module + 0x1FF6F90;

OverrideBytes(key1Ptr, key1, 256);
OverrideBytes(key2Ptr, key2, 256);

IntPtr function_raw = module + 0xFC730;

_decrypt = Marshal.GetDelegateForFunctionPointer<DecryptBlb>(function_raw);
}
IntPtr function_raw = Module + 0xFC730;
DecryptBlb decrypt = (DecryptBlb)Marshal.GetDelegateForFunctionPointer(function_raw, typeof(DecryptBlb));

ulong header_size = (ulong)header.Length;
ulong buffer_size = (ulong)buffer.Length;


decrypt(ref buffer[0], buffer_size > 128 ? 128 : buffer_size, ref header[0], header_size, 0);
_decrypt(ref buffer[0], buffer_size > 128 ? 128 : buffer_size, ref header[0], header_size, 0);
}

public Blb3File(FileReader reader, string path)
Expand Down Expand Up @@ -138,7 +138,8 @@ private void ReadBlocksInfoAndDirectory(byte[] header)
}
for (int i = m_BlocksInfo.Count - 1; i > 0; i--)
{
m_BlocksInfo[i].compressedSize = m_BlocksInfo[i].compressedSize - m_BlocksInfo[i - 1].compressedSize;
m_BlocksInfo[i].compressedSize -= m_BlocksInfo[i - 1].compressedSize;
m_BlocksInfo[i].flags = (StorageBlockFlags)(m_BlocksInfo[i].compressedSize == m_BlocksInfo[i].uncompressedSize ? CompressionType.None : compressionType);
}

reader.Position = nodesInfoOffset;
Expand Down Expand Up @@ -195,42 +196,44 @@ private void ReadBlocks(FileReader reader, Stream blocksStream)
{
case CompressionType.None: //None
{
reader.BaseStream.CopyTo(blocksStream, blockInfo.compressedSize);
var size = (int)blockInfo.uncompressedSize;
var buffer = reader.ReadBytes(size);
Decrypt(Header, buffer);
blocksStream.Write(buffer);
break;
}
case CompressionType.Oodle: //Oodle
{
{
var compressedSize = (int)blockInfo.compressedSize;
var uncompressedSize = (int)blockInfo.uncompressedSize;

var compressedBytes = ArrayPool<byte>.Shared.Rent(compressedSize);
var uncompressedBytes = ArrayPool<byte>.Shared.Rent(uncompressedSize);
var compressedSize = (int)blockInfo.compressedSize;
var uncompressedSize = (int)blockInfo.uncompressedSize;

var compressedBytesSpan = compressedBytes.AsSpan(0, compressedSize);
var uncompressedBytesSpan = uncompressedBytes.AsSpan(0, uncompressedSize);
var compressedBytes = ArrayPool<byte>.Shared.Rent(compressedSize);
var uncompressedBytes = ArrayPool<byte>.Shared.Rent(uncompressedSize);

try
{
var compressedBytesSpan = compressedBytes.AsSpan(0, compressedSize);
var uncompressedBytesSpan = uncompressedBytes.AsSpan(0, uncompressedSize);

reader.Read(compressedBytesSpan);
try
{

reader.Read(compressedBytesSpan);

if (compressedSize > 6)
Decrypt(Header, compressedBytesSpan);

var numWrite = OodleHelper.Decompress(compressedBytesSpan, uncompressedBytesSpan);
if (numWrite != uncompressedSize)
{
Logger.Warning($"Oodle decompression error, write {numWrite} bytes but expected {uncompressedSize} bytes");
}
}
finally
var numWrite = OodleHelper.Decompress(compressedBytesSpan, uncompressedBytesSpan);
if (numWrite != uncompressedSize)
{
blocksStream.Write(uncompressedBytesSpan);
ArrayPool<byte>.Shared.Return(compressedBytes, true);
ArrayPool<byte>.Shared.Return(uncompressedBytes, true);
Logger.Warning($"Oodle decompression error, write {numWrite} bytes but expected {uncompressedSize} bytes");
}
break;
}
finally
{
blocksStream.Write(uncompressedBytesSpan);
ArrayPool<byte>.Shared.Return(compressedBytes, true);
ArrayPool<byte>.Shared.Return(uncompressedBytes, true);
}
break;
}
case CompressionType.Lzma: //LZMA
{
Expand Down
57 changes: 6 additions & 51 deletions AssetStudio/OffsetStream.cs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -79,61 +79,16 @@ public IEnumerable<long> GetOffsets(string path)
}
else
{
using var reader = new FileReader(path, this, true);

var readSignature = reader.FileType;
var signature = "";

if (readSignature == FileType.BundleFile ||
readSignature == FileType.MhyFile ||
readSignature == FileType.Blb3File)
{
switch (reader.FileType)
{
case FileType.BundleFile:
signature = "UnityFS\x00";
break;
case FileType.MhyFile:
signature = "mhy0";
break;
case FileType.Blb3File:
signature = "Blb\x03";
break;
}

Logger.Verbose($"Parsed signature: {signature}");

var signatureBytes = Encoding.UTF8.GetBytes(signature);
var buffer = ArrayPool<byte>.Shared.Rent((int)reader.Length);
while (Remaining > 0)
{
var index = 0;
var absOffset = AbsolutePosition;
var read = Read(buffer);
while (index < read)
{
index = buffer.AsSpan(0, read).Search(signatureBytes, index);
if (index == -1) break;
var offset = absOffset + index;
Offset = offset;
yield return offset;
index++;
}
}
ArrayPool<byte>.Shared.Return(buffer);
} else
while (Remaining > 0)
{
while (Remaining > 0)
Offset = AbsolutePosition;
yield return AbsolutePosition;
if (Offset == AbsolutePosition)
{
Offset = AbsolutePosition;
yield return AbsolutePosition;
if (Offset == AbsolutePosition)
{
break;
}
break;
}
}
}
}
}
}
}

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