private void Parse(AssetsReader reader)
{
UncompressedSize = reader.ReadBEUInt32();
CompressedSize = reader.ReadBEUInt32();
_flags = reader.ReadBEUInt16();
}
private void Parse(AssetsReader reader)
{
Offset = reader.ReadBEInt64();
Size = reader.ReadBEInt64();
_flags = reader.ReadBEUInt32();
Filename = reader.ReadCStr();
}
private void Parse(AssetsReader reader)
{
//basic header stuff
var signature = reader.ReadCStr();
if (signature != "UnityFS")
{
throw new NotSupportedException("Stream is not UnityFS");
}
var fileVersion = reader.ReadBEInt32();
if (fileVersion != 6)
{
throw new NotSupportedException("File version is not supported");
}
PlayerVersion = reader.ReadCStr();
EngineVersion = reader.ReadCStr();
BundleSize = reader.ReadBEInt64();
//header info
var compressedSize = reader.ReadBEInt32();
var decompressedSize = reader.ReadBEInt32();
var flags = reader.ReadBEUInt32();
byte[] infoBytes;
if (IsDirectoryAtEnd(flags))
{
var start = (int)reader.BaseStream.Position;
reader.Seek((int)reader.BaseStream.Length - compressedSize);
infoBytes = reader.ReadBytes(compressedSize);
reader.Seek(start);
}
else
{
infoBytes = reader.ReadBytes(compressedSize);
}
Stream blockInfoStream = null;
try
{
switch (CompressionMode(flags))
{
case UnityFSCompressionMode.LZ4:
case UnityFSCompressionMode.LZ4HC:
blockInfoStream = new MemoryStream(LZ4.LZ4Codec.Decode(infoBytes, 0, infoBytes.Length, decompressedSize));
break;
case UnityFSCompressionMode.NoCompression:
blockInfoStream = new MemoryStream(infoBytes);
break;
case UnityFSCompressionMode.LZMA:
blockInfoStream = new MemoryStream(LZMADecode(infoBytes, decompressedSize));
break;
}
using (AssetsReader infoReader = new AssetsReader(blockInfoStream, false))
ParseDirectory(infoReader);
}
finally
{
if (blockInfoStream != null)
{
blockInfoStream.Dispose();
}
}
MemoryStream outputStream = new MemoryStream();
foreach (var blockInfo in BlockInfos)
{
byte[] blockData = null;
switch (blockInfo.CompressionMode)
{
case UnityFSCompressionMode.LZ4:
case UnityFSCompressionMode.LZ4HC:
blockData = LZ4.LZ4Codec.Decode(reader.ReadBytes((int)blockInfo.CompressedSize), 0, (int)blockInfo.CompressedSize, (int)blockInfo.UncompressedSize);
break;
case UnityFSCompressionMode.NoCompression:
blockData = reader.ReadBytes((int)blockInfo.UncompressedSize);
break;
case UnityFSCompressionMode.LZMA:
blockData = LZMADecode(reader.BaseStream, (int)blockInfo.CompressedSize, (int)blockInfo.UncompressedSize);
break;
}
outputStream.Write(blockData, 0, blockData.Length);
}
using (outputStream)
{
foreach (var entry in Entries)
{
outputStream.Seek(entry.Offset, SeekOrigin.Begin);
entry.Data = outputStream.ReadBytes((int)entry.Size);
}
}
}
