private void getFiles(EndianStream f_Stream, int offset)
{
int fileCount = f_Stream.ReadInt32();
for (int i = 0; i < fileCount; i++)
{
MemoryAssetsFile memFile = new MemoryAssetsFile();
memFile.fileName = f_Stream.ReadStringToNull();
int fileOffset = f_Stream.ReadInt32();
fileOffset += offset;
int fileSize = f_Stream.ReadInt32();
long nextFile = f_Stream.Position;
f_Stream.Position = fileOffset;
byte[] buffer = new byte[fileSize];
f_Stream.Read(buffer, 0, fileSize);
memFile.memStream = new MemoryStream(buffer);
MemoryAssetsFileList.Add(memFile);
f_Stream.Position = nextFile;
}
}
private void readBundle(EndianStream b_Stream)
{
var signature = b_Stream.ReadStringToNull();
if (signature == "UnityWeb" || signature == "UnityRaw" || signature == "\xFA\xFA\xFA\xFA\xFA\xFA\xFA\xFA")
{
format = b_Stream.ReadInt32();
versionPlayer = b_Stream.ReadStringToNull();
versionEngine = b_Stream.ReadStringToNull();
if (format < 6)
{
int bundleSize = b_Stream.ReadInt32();
}
else if (format == 6)
{
ReadFormat6(b_Stream, true);
return;
}
short dummy2 = b_Stream.ReadInt16();
int offset = b_Stream.ReadInt16();
int dummy3 = b_Stream.ReadInt32();
int lzmaChunks = b_Stream.ReadInt32();
int lzmaSize = 0;
long streamSize = 0;
for (int i = 0; i < lzmaChunks; i++)
{
lzmaSize = b_Stream.ReadInt32();
streamSize = b_Stream.ReadInt32();
}
b_Stream.Position = offset;
switch (signature)
{
case "\xFA\xFA\xFA\xFA\xFA\xFA\xFA\xFA": //.bytes
case "UnityWeb":
{
byte[] lzmaBuffer = new byte[lzmaSize];
b_Stream.Read(lzmaBuffer, 0, lzmaSize);
using (var lzmaStream = new EndianStream(SevenZipHelper.StreamDecompress(new MemoryStream(lzmaBuffer)), EndianType.BigEndian))
{
getFiles(lzmaStream, 0);
}
break;
}
case "UnityRaw":
{
getFiles(b_Stream, offset);
break;
}
}
}
else if (signature == "UnityFS")
{
format = b_Stream.ReadInt32();
versionPlayer = b_Stream.ReadStringToNull();
versionEngine = b_Stream.ReadStringToNull();
if (format == 6)
{
ReadFormat6(b_Stream);
}
}
}
private void ReadFormat6(EndianStream b_Stream, bool padding = false)
{
var bundleSize = b_Stream.ReadInt64();
int compressedSize = b_Stream.ReadInt32();
int uncompressedSize = b_Stream.ReadInt32();
int flag = b_Stream.ReadInt32();
if (padding)
{
b_Stream.ReadByte();
}
byte[] blocksInfoBytes;
if ((flag & 0x80) != 0)//at end of file
{
var position = b_Stream.Position;
b_Stream.Position = b_Stream.BaseStream.Length - compressedSize;
blocksInfoBytes = b_Stream.ReadBytes(compressedSize);
b_Stream.Position = position;
}
else
{
blocksInfoBytes = b_Stream.ReadBytes(compressedSize);
}
EndianStream blocksInfo;
switch (flag & 0x3F)
{
default: //None
{
blocksInfo = new EndianStream(new MemoryStream(blocksInfoBytes), EndianType.BigEndian);
break;
}
case 1: //LZMA
{
blocksInfo = new EndianStream(SevenZipHelper.StreamDecompress(new MemoryStream(blocksInfoBytes)), EndianType.BigEndian);
break;
}
case 2: //LZ4
case 3: //LZ4HC
{
byte[] uncompressedBytes = new byte[uncompressedSize];
using (var mstream = new MemoryStream(blocksInfoBytes))
{
var decoder = new Lz4DecoderStream(mstream);
decoder.Read(uncompressedBytes, 0, uncompressedSize);
decoder.Dispose();
}
blocksInfo = new EndianStream(new MemoryStream(uncompressedBytes), EndianType.BigEndian);
break;
}
//case 4:LZHAM?
}
using (blocksInfo)
{
blocksInfo.Position = 0x10;
int blockcount = blocksInfo.ReadInt32();
EndianStream assetsData;
var assetsDataStream = new MemoryStream();
for (int i = 0; i < blockcount; i++)
{
uncompressedSize = blocksInfo.ReadInt32();
compressedSize = blocksInfo.ReadInt32();
flag = blocksInfo.ReadInt16();
var compressedBytes = b_Stream.ReadBytes(compressedSize);
switch (flag & 0x3F)
{
default: //None
{
assetsDataStream.Write(compressedBytes, 0, compressedSize);
break;
}
case 1: //LZMA
{
var uncompressedBytes = new byte[uncompressedSize];
using (var mstream = new MemoryStream(compressedBytes))
{
var decoder = SevenZipHelper.StreamDecompress(mstream, uncompressedSize);
decoder.Read(uncompressedBytes, 0, uncompressedSize);
decoder.Dispose();
}
assetsDataStream.Write(uncompressedBytes, 0, uncompressedSize);
break;
}
case 2: //LZ4
case 3: //LZ4HC
{
var uncompressedBytes = new byte[uncompressedSize];
using (var mstream = new MemoryStream(compressedBytes))
{
var decoder = new Lz4DecoderStream(mstream);
decoder.Read(uncompressedBytes, 0, uncompressedSize);
decoder.Dispose();
}
assetsDataStream.Write(uncompressedBytes, 0, uncompressedSize);
break;
}
//case 4:LZHAM?
}
}
assetsData = new EndianStream(assetsDataStream, EndianType.BigEndian);
using (assetsData)
{
var entryinfo_count = blocksInfo.ReadInt32();
for (int i = 0; i < entryinfo_count; i++)
{
var memFile = new MemoryAssetsFile();
var entryinfo_offset = blocksInfo.ReadInt64();
var entryinfo_size = blocksInfo.ReadInt64();
var unknown = blocksInfo.ReadInt32();
memFile.fileName = blocksInfo.ReadStringToNull();
assetsData.Position = entryinfo_offset;
var buffer = new byte[entryinfo_size];
assetsData.Read(buffer, 0, (int)entryinfo_size);
memFile.memStream = new MemoryStream(buffer);
MemoryAssetsFileList.Add(memFile);
}
}
}
}