mirror of
https://github.com/aelurum/AssetStudio.git
synced 2025-07-18 03:24:15 -04:00
522 lines
22 KiB
C#
522 lines
22 KiB
C#
using System;
|
|
using System.IO;
|
|
using System.Linq;
|
|
|
|
namespace AssetStudio
|
|
{
|
|
[Flags]
|
|
public enum ArchiveFlags
|
|
{
|
|
CompressionTypeMask = 0x3f,
|
|
BlocksAndDirectoryInfoCombined = 0x40,
|
|
BlocksInfoAtTheEnd = 0x80,
|
|
OldWebPluginCompatibility = 0x100,
|
|
BlockInfoNeedPaddingAtStart = 0x200
|
|
}
|
|
|
|
[Flags]
|
|
public enum CnEncryptionFlags
|
|
{
|
|
V1 = 0x200,
|
|
V2_V3 = 0x1400,
|
|
}
|
|
|
|
[Flags]
|
|
public enum StorageBlockFlags
|
|
{
|
|
CompressionTypeMask = 0x3f,
|
|
Streamed = 0x40
|
|
}
|
|
|
|
public enum CompressionType
|
|
{
|
|
Auto = -1,
|
|
None,
|
|
Lzma,
|
|
Lz4,
|
|
Lz4HC,
|
|
Lzham,
|
|
Zstd, //custom
|
|
Oodle, //custom
|
|
}
|
|
|
|
public class BundleFile
|
|
{
|
|
public readonly bool IsMultiBundle;
|
|
|
|
public class Header
|
|
{
|
|
public string signature;
|
|
public uint version;
|
|
public string unityVersion;
|
|
public UnityVersion unityRevision;
|
|
public long size;
|
|
public uint compressedBlocksInfoSize;
|
|
public uint uncompressedBlocksInfoSize;
|
|
public ArchiveFlags flags;
|
|
}
|
|
|
|
public class StorageBlock
|
|
{
|
|
public uint compressedSize;
|
|
public uint uncompressedSize;
|
|
public StorageBlockFlags flags;
|
|
}
|
|
|
|
public class Node
|
|
{
|
|
public long offset;
|
|
public long size;
|
|
public uint flags;
|
|
public string path;
|
|
}
|
|
|
|
public Header m_Header;
|
|
private StorageBlock[] m_BlocksInfo;
|
|
private Node[] m_DirectoryInfo;
|
|
|
|
public StreamFile[] fileList;
|
|
|
|
public BundleFile(FileReader reader, CompressionType customBlockInfoCompression, CompressionType customBlockCompression, UnityVersion specUnityVer = null)
|
|
{
|
|
m_Header = new Header();
|
|
m_Header.signature = reader.ReadStringToNull();
|
|
m_Header.version = reader.ReadUInt32();
|
|
m_Header.unityVersion = reader.ReadStringToNull();
|
|
m_Header.unityRevision = new UnityVersion(reader.ReadStringToNull());
|
|
switch (m_Header.signature)
|
|
{
|
|
case "UnityArchive":
|
|
break; //TODO
|
|
case "UnityWeb":
|
|
case "UnityRaw":
|
|
if (m_Header.version == 6)
|
|
{
|
|
goto case "UnityFS";
|
|
}
|
|
ReadHeaderAndBlocksInfo(reader);
|
|
using (var blocksStream = CreateBlocksStream(reader.FullPath))
|
|
{
|
|
ReadBlocksAndDirectory(reader, blocksStream);
|
|
ReadFiles(blocksStream, reader.FullPath);
|
|
}
|
|
break;
|
|
case "UnityFS":
|
|
ReadHeader(reader);
|
|
|
|
var bundleSize = m_Header.size;
|
|
var streamSize = reader.BaseStream.Length;
|
|
if (bundleSize > streamSize)
|
|
{
|
|
Logger.Warning("Bundle size is incorrect.");
|
|
}
|
|
else if (streamSize - bundleSize > 200)
|
|
{
|
|
IsMultiBundle = true;
|
|
}
|
|
|
|
var unityVer = m_Header.unityRevision;
|
|
if (specUnityVer != null)
|
|
{
|
|
if (!unityVer.IsStripped && specUnityVer != unityVer)
|
|
{
|
|
Logger.Warning($"Detected Unity version is different from the specified one ({specUnityVer.FullVersion.Color(ColorConsole.BrightCyan)}).\n" +
|
|
$"Assets may load with errors.\n" +
|
|
$"It is recommended to specify the detected Unity version: {unityVer.FullVersion.Color(ColorConsole.BrightCyan)}");
|
|
}
|
|
unityVer = specUnityVer;
|
|
}
|
|
|
|
UnityCnCheck(reader, customBlockInfoCompression, unityVer);
|
|
|
|
ReadBlocksInfoAndDirectory(reader, customBlockInfoCompression, unityVer);
|
|
using (var blocksStream = CreateBlocksStream(reader.FullPath))
|
|
{
|
|
ReadBlocks(reader, customBlockCompression, blocksStream);
|
|
ReadFiles(blocksStream, reader.FullPath);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
private void ReadHeaderAndBlocksInfo(FileReader reader)
|
|
{
|
|
if (m_Header.version >= 4)
|
|
{
|
|
var hash = reader.ReadBytes(16);
|
|
var crc = reader.ReadUInt32();
|
|
}
|
|
var minimumStreamedBytes = reader.ReadUInt32();
|
|
m_Header.size = reader.ReadUInt32();
|
|
var numberOfLevelsToDownloadBeforeStreaming = reader.ReadUInt32();
|
|
var levelCount = reader.ReadInt32();
|
|
m_BlocksInfo = new StorageBlock[1];
|
|
for (int i = 0; i < levelCount; i++)
|
|
{
|
|
var storageBlock = new StorageBlock()
|
|
{
|
|
compressedSize = reader.ReadUInt32(),
|
|
uncompressedSize = reader.ReadUInt32(),
|
|
};
|
|
if (i == levelCount - 1)
|
|
{
|
|
m_BlocksInfo[0] = storageBlock;
|
|
}
|
|
}
|
|
if (m_Header.version >= 2)
|
|
{
|
|
var completeFileSize = reader.ReadUInt32();
|
|
}
|
|
if (m_Header.version >= 3)
|
|
{
|
|
var fileInfoHeaderSize = reader.ReadUInt32();
|
|
}
|
|
reader.Position = m_Header.size;
|
|
}
|
|
|
|
private Stream CreateBlocksStream(string path)
|
|
{
|
|
Stream blocksStream;
|
|
var uncompressedSizeSum = m_BlocksInfo.Sum(x => x.uncompressedSize);
|
|
if (uncompressedSizeSum >= int.MaxValue)
|
|
{
|
|
/*var memoryMappedFile = MemoryMappedFile.CreateNew(null, uncompressedSizeSum);
|
|
assetsDataStream = memoryMappedFile.CreateViewStream();*/
|
|
blocksStream = new FileStream(path + ".temp", FileMode.Create, FileAccess.ReadWrite, FileShare.None, 4096, FileOptions.DeleteOnClose);
|
|
}
|
|
else
|
|
{
|
|
blocksStream = new MemoryStream((int)uncompressedSizeSum);
|
|
}
|
|
return blocksStream;
|
|
}
|
|
|
|
private void ReadBlocksAndDirectory(FileReader reader, Stream blocksStream)
|
|
{
|
|
var isCompressed = m_Header.signature == "UnityWeb";
|
|
foreach (var blockInfo in m_BlocksInfo)
|
|
{
|
|
var uncompressedBytes = reader.ReadBytes((int)blockInfo.compressedSize);
|
|
if (isCompressed)
|
|
{
|
|
using (var memoryStream = new MemoryStream(uncompressedBytes))
|
|
{
|
|
using (var decompressStream = BundleDecompressionHelper.DecompressLzmaStream(memoryStream))
|
|
{
|
|
uncompressedBytes = decompressStream.ToArray();
|
|
}
|
|
}
|
|
}
|
|
blocksStream.Write(uncompressedBytes, 0, uncompressedBytes.Length);
|
|
}
|
|
blocksStream.Position = 0;
|
|
var blocksReader = new EndianBinaryReader(blocksStream);
|
|
var nodesCount = blocksReader.ReadInt32();
|
|
m_DirectoryInfo = new Node[nodesCount];
|
|
for (int i = 0; i < nodesCount; i++)
|
|
{
|
|
m_DirectoryInfo[i] = new Node
|
|
{
|
|
path = blocksReader.ReadStringToNull(),
|
|
offset = blocksReader.ReadUInt32(),
|
|
size = blocksReader.ReadUInt32()
|
|
};
|
|
}
|
|
}
|
|
|
|
public void ReadFiles(Stream blocksStream, string path)
|
|
{
|
|
fileList = new StreamFile[m_DirectoryInfo.Length];
|
|
for (int i = 0; i < m_DirectoryInfo.Length; i++)
|
|
{
|
|
var node = m_DirectoryInfo[i];
|
|
var file = new StreamFile();
|
|
fileList[i] = file;
|
|
file.path = node.path;
|
|
file.fileName = Path.GetFileName(node.path);
|
|
if (node.size >= int.MaxValue)
|
|
{
|
|
/*var memoryMappedFile = MemoryMappedFile.CreateNew(null, entryinfo_size);
|
|
file.stream = memoryMappedFile.CreateViewStream();*/
|
|
var extractPath = path + "_unpacked" + Path.DirectorySeparatorChar;
|
|
Directory.CreateDirectory(extractPath);
|
|
file.stream = new FileStream(extractPath + file.fileName, FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite);
|
|
}
|
|
else
|
|
{
|
|
file.stream = new MemoryStream((int)node.size);
|
|
}
|
|
blocksStream.Position = node.offset;
|
|
blocksStream.CopyTo(file.stream, node.size);
|
|
file.stream.Position = 0;
|
|
}
|
|
}
|
|
|
|
private void ReadHeader(FileReader reader)
|
|
{
|
|
m_Header.size = reader.ReadInt64();
|
|
m_Header.compressedBlocksInfoSize = reader.ReadUInt32();
|
|
m_Header.uncompressedBlocksInfoSize = reader.ReadUInt32();
|
|
m_Header.flags = (ArchiveFlags)reader.ReadUInt32();
|
|
if (m_Header.signature != "UnityFS")
|
|
{
|
|
reader.ReadByte();
|
|
}
|
|
}
|
|
|
|
private void ReadBlocksInfoAndDirectory(FileReader reader, CompressionType customBlockInfoCompression, UnityVersion unityVer, bool silent = false)
|
|
{
|
|
byte[] blocksInfoBytes;
|
|
|
|
if (m_Header.version >= 7)
|
|
{
|
|
reader.AlignStream(16);
|
|
}
|
|
else if (unityVer >= (2019, 4) && m_Header.flags != ArchiveFlags.BlocksAndDirectoryInfoCombined)
|
|
{
|
|
//check if we need to align the reader
|
|
//- align to 16 bytes and check if all are 0
|
|
//- if not, reset the reader to the previous position
|
|
var preAlign = reader.Position;
|
|
var alignData = reader.ReadBytes((16 - (int)(preAlign % 16)) % 16);
|
|
if (alignData.Any(x => x != 0))
|
|
{
|
|
reader.Position = preAlign;
|
|
}
|
|
}
|
|
|
|
var compressedSize = (int)m_Header.compressedBlocksInfoSize;
|
|
var uncompressedSize = (int)m_Header.uncompressedBlocksInfoSize;
|
|
if ((m_Header.flags & ArchiveFlags.BlocksInfoAtTheEnd) != 0)
|
|
{
|
|
var position = reader.Position;
|
|
reader.Position = m_Header.size - compressedSize;
|
|
blocksInfoBytes = reader.ReadBytes(compressedSize);
|
|
reader.Position = position;
|
|
}
|
|
else //0x40 BlocksAndDirectoryInfoCombined
|
|
{
|
|
blocksInfoBytes = reader.ReadBytes(compressedSize);
|
|
}
|
|
|
|
var compressionType = (CompressionType)(m_Header.flags & ArchiveFlags.CompressionTypeMask);
|
|
if (customBlockInfoCompression == CompressionType.Auto)
|
|
{
|
|
if (!silent && compressionType > CompressionType.Lzham && Enum.IsDefined(typeof(CompressionType), compressionType))
|
|
{
|
|
Logger.Warning($"Non-standard blockInfo compression type: {(int)compressionType}. Trying to decompress as {compressionType} archive..");
|
|
}
|
|
}
|
|
else if (compressionType != CompressionType.None)
|
|
{
|
|
compressionType = customBlockInfoCompression;
|
|
if (!silent)
|
|
{
|
|
Logger.Info($"Custom blockInfo compression type: {customBlockInfoCompression}");
|
|
}
|
|
}
|
|
Logger.Debug($"BlockInfo compression: {compressionType}");
|
|
|
|
int numWrite;
|
|
var errorMsg = string.Empty;
|
|
MemoryStream blocksInfoUncompressedStream;
|
|
switch (compressionType)
|
|
{
|
|
case CompressionType.None:
|
|
{
|
|
blocksInfoUncompressedStream = new MemoryStream(blocksInfoBytes);
|
|
numWrite = compressedSize;
|
|
break;
|
|
}
|
|
case CompressionType.Lzma:
|
|
{
|
|
blocksInfoUncompressedStream = new MemoryStream(uncompressedSize);
|
|
using (var blocksInfoCompressedStream = new MemoryStream(blocksInfoBytes))
|
|
{
|
|
numWrite = (int)BundleDecompressionHelper.DecompressLzmaStream(blocksInfoCompressedStream, blocksInfoUncompressedStream, compressedSize, uncompressedSize, ref errorMsg);
|
|
}
|
|
blocksInfoUncompressedStream.Position = 0;
|
|
break;
|
|
}
|
|
case CompressionType.Lz4:
|
|
case CompressionType.Lz4HC:
|
|
case CompressionType.Zstd:
|
|
case CompressionType.Oodle:
|
|
{
|
|
var uncompressedBytes = new byte[uncompressedSize];
|
|
numWrite = BundleDecompressionHelper.DecompressBlock(compressionType, blocksInfoBytes, uncompressedBytes, ref errorMsg);
|
|
blocksInfoUncompressedStream = new MemoryStream(uncompressedBytes);
|
|
break;
|
|
}
|
|
case CompressionType.Lzham:
|
|
throw new IOException($"Unsupported blockInfo compression type: {compressionType}.\n");
|
|
default:
|
|
throw new IOException($"Unknown blockInfo compression type: {compressionType}.\nYou may try to specify the compression type manually.\n");
|
|
}
|
|
|
|
if (numWrite != uncompressedSize)
|
|
{
|
|
var msg = $"{compressionType} blockInfo decompression error. {errorMsg}\nWrite {numWrite} bytes but expected {uncompressedSize} bytes.";
|
|
var exMsg = compressionType > CompressionType.Lz4HC
|
|
? "Wrong compression type or blockInfo data might be encrypted."
|
|
: "BlockInfo data might be encrypted.";
|
|
throw new IOException($"{msg}\n{exMsg}\n");
|
|
}
|
|
|
|
using (var blocksInfoReader = new EndianBinaryReader(blocksInfoUncompressedStream))
|
|
{
|
|
var uncompressedDataHash = blocksInfoReader.ReadBytes(16);
|
|
var blocksInfoCount = blocksInfoReader.ReadInt32();
|
|
m_BlocksInfo = new StorageBlock[blocksInfoCount];
|
|
for (int i = 0; i < blocksInfoCount; i++)
|
|
{
|
|
m_BlocksInfo[i] = new StorageBlock
|
|
{
|
|
uncompressedSize = blocksInfoReader.ReadUInt32(),
|
|
compressedSize = blocksInfoReader.ReadUInt32(),
|
|
flags = (StorageBlockFlags)blocksInfoReader.ReadUInt16()
|
|
};
|
|
}
|
|
|
|
var nodesCount = blocksInfoReader.ReadInt32();
|
|
m_DirectoryInfo = new Node[nodesCount];
|
|
for (int i = 0; i < nodesCount; i++)
|
|
{
|
|
m_DirectoryInfo[i] = new Node
|
|
{
|
|
offset = blocksInfoReader.ReadInt64(),
|
|
size = blocksInfoReader.ReadInt64(),
|
|
flags = blocksInfoReader.ReadUInt32(),
|
|
path = blocksInfoReader.ReadStringToNull(),
|
|
};
|
|
}
|
|
}
|
|
if ((m_Header.flags & ArchiveFlags.BlockInfoNeedPaddingAtStart) != 0)
|
|
{
|
|
reader.AlignStream(16);
|
|
}
|
|
}
|
|
|
|
private void ReadBlocks(FileReader reader, CompressionType customBlockCompression, Stream blocksStream)
|
|
{
|
|
Logger.Debug($"Block compression: {(CompressionType)m_BlocksInfo.Max(x => x.flags)}");
|
|
|
|
var showCustomTypeWarning = true;
|
|
foreach (var blockInfo in m_BlocksInfo)
|
|
{
|
|
var compressionType = (CompressionType)(blockInfo.flags & StorageBlockFlags.CompressionTypeMask);
|
|
if (customBlockCompression == CompressionType.Auto)
|
|
{
|
|
if (showCustomTypeWarning && compressionType > CompressionType.Lzham && Enum.IsDefined(typeof(CompressionType), compressionType))
|
|
{
|
|
Logger.Warning($"Non-standard block compression type: {(int)compressionType}. Trying to decompress as {compressionType} archive..");
|
|
showCustomTypeWarning = false;
|
|
}
|
|
}
|
|
else if (compressionType != CompressionType.None)
|
|
{
|
|
compressionType = customBlockCompression;
|
|
if (showCustomTypeWarning)
|
|
{
|
|
Logger.Info($"Custom block compression type: {customBlockCompression}");
|
|
showCustomTypeWarning = false;
|
|
}
|
|
}
|
|
|
|
long numWrite;
|
|
var errorMsg = string.Empty;
|
|
switch (compressionType)
|
|
{
|
|
case CompressionType.None:
|
|
{
|
|
reader.BaseStream.CopyTo(blocksStream, blockInfo.compressedSize);
|
|
numWrite = blockInfo.compressedSize;
|
|
break;
|
|
}
|
|
case CompressionType.Lzma:
|
|
{
|
|
numWrite = BundleDecompressionHelper.DecompressLzmaStream(reader.BaseStream, blocksStream, blockInfo.compressedSize, blockInfo.uncompressedSize, ref errorMsg);
|
|
break;
|
|
}
|
|
case CompressionType.Lz4:
|
|
case CompressionType.Lz4HC:
|
|
case CompressionType.Zstd:
|
|
case CompressionType.Oodle:
|
|
{
|
|
var compressedSize = (int)blockInfo.compressedSize;
|
|
var uncompressedSize = (int)blockInfo.uncompressedSize;
|
|
|
|
var compressedBytes = BigArrayPool<byte>.Shared.Rent(compressedSize);
|
|
var uncompressedBytes = BigArrayPool<byte>.Shared.Rent(uncompressedSize);
|
|
try
|
|
{
|
|
_ = reader.Read(compressedBytes, 0, compressedSize);
|
|
var compressedSpan = new ReadOnlySpan<byte>(compressedBytes, 0, compressedSize);
|
|
var uncompressedSpan = new Span<byte>(uncompressedBytes, 0, uncompressedSize);
|
|
|
|
numWrite = BundleDecompressionHelper.DecompressBlock(compressionType, compressedSpan, uncompressedSpan, ref errorMsg);
|
|
if (numWrite == uncompressedSize)
|
|
blocksStream.Write(uncompressedBytes, 0, uncompressedSize);
|
|
}
|
|
finally
|
|
{
|
|
BigArrayPool<byte>.Shared.Return(compressedBytes, clearArray: true);
|
|
BigArrayPool<byte>.Shared.Return(uncompressedBytes, clearArray: true);
|
|
}
|
|
break;
|
|
}
|
|
case CompressionType.Lzham:
|
|
throw new IOException($"Unsupported block compression type: {compressionType}.\n");
|
|
default:
|
|
throw new IOException($"Unknown block compression type: {compressionType}.\nYou may try to specify the compression type manually.\n");
|
|
}
|
|
|
|
if (numWrite != blockInfo.uncompressedSize)
|
|
{
|
|
var msg = $"{compressionType} block decompression error. {errorMsg}\nWrite {numWrite} bytes but expected {blockInfo.uncompressedSize} bytes.";
|
|
var exMsg = compressionType > CompressionType.Lz4HC
|
|
? "Wrong compression type or block data might be encrypted."
|
|
: "Block data might be encrypted.";
|
|
throw new IOException($"{msg}\n{exMsg}\n");
|
|
}
|
|
}
|
|
blocksStream.Position = 0;
|
|
}
|
|
|
|
private void UnityCnCheck(FileReader reader, CompressionType customBlockInfoCompression, UnityVersion unityVer)
|
|
{
|
|
var hasUnityCnFlag = false;
|
|
if (!unityVer.IsStripped)
|
|
{
|
|
// https://issuetracker.unity3d.com/issues/files-within-assetbundles-do-not-start-on-aligned-boundaries-breaking-patching-on-nintendo-switch
|
|
if (unityVer < 2020
|
|
|| unityVer.IsInRange(2020, (2020, 3, 34))
|
|
|| unityVer.IsInRange(2021, (2021, 3, 2))
|
|
|| unityVer.IsInRange(2022, (2022, 1, 1)))
|
|
{
|
|
hasUnityCnFlag = ((CnEncryptionFlags)m_Header.flags & CnEncryptionFlags.V1) != 0;
|
|
}
|
|
else
|
|
{
|
|
hasUnityCnFlag = ((CnEncryptionFlags)m_Header.flags & CnEncryptionFlags.V2_V3) != 0;
|
|
}
|
|
}
|
|
if (!hasUnityCnFlag)
|
|
return;
|
|
|
|
var pos = reader.Position;
|
|
reader.Position += 70;
|
|
try
|
|
{
|
|
ReadBlocksInfoAndDirectory(reader, customBlockInfoCompression, unityVer, silent: true);
|
|
}
|
|
catch (Exception)
|
|
{
|
|
reader.Position = pos;
|
|
return;
|
|
}
|
|
throw new NotSupportedException("Unsupported bundle file. UnityCN encryption was detected.");
|
|
}
|
|
}
|
|
}
|