- [Core] Fix bug with assets parsing.
This commit is contained in:
Razmoth
223
AssetStudio/MhyFile.cs
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223
AssetStudio/MhyFile.cs
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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namespace AssetStudio
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{
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public class MhyFile
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{
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private string signature;
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private List<BundleFile.StorageBlock> m_BlocksInfo;
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private List<BundleFile.Node> m_DirectoryInfo;
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public BundleFile.Header m_Header;
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public List<StreamFile> fileList;
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public long Offset;
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public Mhy mhy;
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public long TotalSize => 8 + m_Header.compressedBlocksInfoSize + m_BlocksInfo.Sum(x => x.compressedSize);
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public MhyFile(FileReader reader, string path, Mhy mhy)
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{
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this.mhy = mhy;
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Offset = reader.Position;
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reader.Endian = EndianType.LittleEndian;
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signature = reader.ReadStringToNull(4);
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Logger.Verbose($"Parsed signature {signature}");
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if (signature != "mhy0")
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throw new Exception("not a mhy file");
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m_Header = new BundleFile.Header
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{
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version = 6,
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unityVersion = "5.x.x",
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unityRevision = "2017.4.30f1",
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compressedBlocksInfoSize = reader.ReadUInt32(),
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flags = (ArchiveFlags)0x43
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};
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Logger.Verbose($"Header: {m_Header}");
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ReadBlocksInfoAndDirectory(reader);
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using var blocksStream = CreateBlocksStream(path);
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ReadBlocks(reader, blocksStream);
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ReadFiles(blocksStream, path);
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}
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private void ReadBlocksInfoAndDirectory(FileReader reader)
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{
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int offset = 0x20;
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var blocksInfo = reader.ReadBytes((int)m_Header.compressedBlocksInfoSize);
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DescrambleHeader(blocksInfo);
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Logger.Verbose($"Descrambled blocksInfo signature {Convert.ToHexString(blocksInfo, 0 , 4)}");
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using var blocksInfoStream = new MemoryStream(blocksInfo, offset, (int)m_Header.compressedBlocksInfoSize - offset);
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using var blocksInfoReader = new EndianBinaryReader(blocksInfoStream);
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m_Header.uncompressedBlocksInfoSize = blocksInfoReader.ReadMhyUInt();
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Logger.Verbose($"uncompressed blocksInfo size: 0x{m_Header.uncompressedBlocksInfoSize:X8}");
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var compressedBlocksInfo = blocksInfoReader.ReadBytes((int)blocksInfoReader.Remaining);
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var uncompressedBlocksInfo = BigArrayPool<byte>.Shared.Rent((int)m_Header.uncompressedBlocksInfoSize);
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var uncompressedBlocksInfoSpan = uncompressedBlocksInfo.AsSpan(0, (int)m_Header.uncompressedBlocksInfoSize);
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var numWrite = LZ4.Decompress(compressedBlocksInfo, uncompressedBlocksInfoSpan);
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if (numWrite != m_Header.uncompressedBlocksInfoSize)
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{
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throw new IOException($"Lz4 decompression error, write {numWrite} bytes but expected {m_Header.uncompressedBlocksInfoSize} bytes");
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}
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Logger.Verbose($"Writing block and directory to blocks stream...");
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using var blocksInfoUncompressedStream = new MemoryStream(uncompressedBlocksInfo);
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using var blocksInfoUncompressedReader = new EndianBinaryReader(blocksInfoUncompressedStream);
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var nodesCount = blocksInfoUncompressedReader.ReadMhyInt();
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m_DirectoryInfo = new List<BundleFile.Node>();
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Logger.Verbose($"Directory count: {nodesCount}");
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for (int i = 0; i < nodesCount; i++)
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{
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m_DirectoryInfo.Add(new BundleFile.Node
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{
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path = blocksInfoUncompressedReader.ReadMhyString(),
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flags = blocksInfoUncompressedReader.ReadBoolean() ? 4u : 0,
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offset = blocksInfoUncompressedReader.ReadMhyInt(),
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size = blocksInfoUncompressedReader.ReadMhyUInt()
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});
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Logger.Verbose($"Directory {i} Info: {m_DirectoryInfo[i]}");
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}
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var blocksInfoCount = blocksInfoUncompressedReader.ReadMhyInt();
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m_BlocksInfo = new List<BundleFile.StorageBlock>();
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Logger.Verbose($"Blocks count: {blocksInfoCount}");
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for (int i = 0; i < blocksInfoCount; i++)
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{
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m_BlocksInfo.Add(new BundleFile.StorageBlock
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{
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compressedSize = (uint)blocksInfoUncompressedReader.ReadMhyInt(),
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uncompressedSize = blocksInfoUncompressedReader.ReadMhyUInt(),
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flags = (StorageBlockFlags)0x43
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});
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Logger.Verbose($"Block {i} Info: {m_BlocksInfo[i]}");
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}
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BigArrayPool<byte>.Shared.Return(uncompressedBlocksInfo);
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}
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private Stream CreateBlocksStream(string path)
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{
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Stream blocksStream;
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var uncompressedSizeSum = (int)m_BlocksInfo.Sum(x => x.uncompressedSize);
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Logger.Verbose($"Total size of decompressed blocks: 0x{uncompressedSizeSum:X8}");
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if (uncompressedSizeSum >= int.MaxValue)
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blocksStream = new FileStream(path + ".temp", FileMode.Create, FileAccess.ReadWrite, FileShare.None, 4096, FileOptions.DeleteOnClose);
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else
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blocksStream = new MemoryStream(uncompressedSizeSum);
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return blocksStream;
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}
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private void ReadBlocks(EndianBinaryReader reader, Stream blocksStream)
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{
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foreach (var blockInfo in m_BlocksInfo)
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{
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var compressedSize = (int)blockInfo.compressedSize;
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var uncompressedSize = (int)blockInfo.uncompressedSize;
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if (compressedSize < 0x10)
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{
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throw new Exception($"Wrong compressed length: {compressedSize}");
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}
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var compressedBytes = BigArrayPool<byte>.Shared.Rent(compressedSize);
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var uncompressedBytes = BigArrayPool<byte>.Shared.Rent(uncompressedSize);
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reader.Read(compressedBytes, 0, compressedSize);
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var offset = 0xC;
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var compressedBytesSpan = compressedBytes.AsSpan(0, compressedSize);
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var uncompressedBytesSpan = uncompressedBytes.AsSpan(0, uncompressedSize);
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DescrambleEntry(compressedBytesSpan);
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Logger.Verbose($"Descrambled block signature {Convert.ToHexString(compressedBytes, 0, 4)}");
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var numWrite = LZ4.Decompress(compressedBytesSpan[offset..], uncompressedBytesSpan);
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if (numWrite != uncompressedSize)
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{
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throw new IOException($"Lz4 decompression error, write {numWrite} bytes but expected {uncompressedSize} bytes");
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}
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blocksStream.Write(uncompressedBytes, 0, uncompressedSize);
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BigArrayPool<byte>.Shared.Return(compressedBytes);
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BigArrayPool<byte>.Shared.Return(uncompressedBytes);
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}
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}
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private void ReadFiles(Stream blocksStream, string path)
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{
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Logger.Verbose($"Writing files from blocks stream...");
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fileList = new List<StreamFile>();
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for (int i = 0; i < m_DirectoryInfo.Count; i++)
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{
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var node = m_DirectoryInfo[i];
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var file = new StreamFile();
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fileList.Add(file);
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file.path = node.path;
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file.fileName = Path.GetFileName(node.path);
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if (node.size >= int.MaxValue)
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{
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var extractPath = path + "_unpacked" + Path.DirectorySeparatorChar;
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Directory.CreateDirectory(extractPath);
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file.stream = new FileStream(extractPath + file.fileName, FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite);
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}
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else
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file.stream = new MemoryStream((int)node.size);
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blocksStream.Position = node.offset;
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blocksStream.CopyTo(file.stream, node.size);
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file.stream.Position = 0;
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}
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}
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#region Scramble
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private static readonly byte[] GF256Exp = new byte[] { 0x01, 0x03, 0x05, 0x0F, 0x11, 0x33, 0x55, 0xFF, 0x1A, 0x2E, 0x72, 0x96, 0xA1, 0xF8, 0x13, 0x35, 0x5F, 0xE1, 0x38, 0x48, 0xD8, 0x73, 0x95, 0xA4, 0xF7, 0x02, 0x06, 0x0A, 0x1E, 0x22, 0x66, 0xAA, 0xE5, 0x34, 0x5C, 0xE4, 0x37, 0x59, 0xEB, 0x26, 0x6A, 0xBE, 0xD9, 0x70, 0x90, 0xAB, 0xE6, 0x31, 0x53, 0xF5, 0x04, 0x0C, 0x14, 0x3C, 0x44, 0xCC, 0x4F, 0xD1, 0x68, 0xB8, 0xD3, 0x6E, 0xB2, 0xCD, 0x4C, 0xD4, 0x67, 0xA9, 0xE0, 0x3B, 0x4D, 0xD7, 0x62, 0xA6, 0xF1, 0x08, 0x18, 0x28, 0x78, 0x88, 0x83, 0x9E, 0xB9, 0xD0, 0x6B, 0xBD, 0xDC, 0x7F, 0x81, 0x98, 0xB3, 0xCE, 0x49, 0xDB, 0x76, 0x9A, 0xB5, 0xC4, 0x57, 0xF9, 0x10, 0x30, 0x50, 0xF0, 0x0B, 0x1D, 0x27, 0x69, 0xBB, 0xD6, 0x61, 0xA3, 0xFE, 0x19, 0x2B, 0x7D, 0x87, 0x92, 0xAD, 0xEC, 0x2F, 0x71, 0x93, 0xAE, 0xE9, 0x20, 0x60, 0xA0, 0xFB, 0x16, 0x3A, 0x4E, 0xD2, 0x6D, 0xB7, 0xC2, 0x5D, 0xE7, 0x32, 0x56, 0xFA, 0x15, 0x3F, 0x41, 0xC3, 0x5E, 0xE2, 0x3D, 0x47, 0xC9, 0x40, 0xC0, 0x5B, 0xED, 0x2C, 0x74, 0x9C, 0xBF, 0xDA, 0x75, 0x9F, 0xBA, 0xD5, 0x64, 0xAC, 0xEF, 0x2A, 0x7E, 0x82, 0x9D, 0xBC, 0xDF, 0x7A, 0x8E, 0x89, 0x80, 0x9B, 0xB6, 0xC1, 0x58, 0xE8, 0x23, 0x65, 0xAF, 0xEA, 0x25, 0x6F, 0xB1, 0xC8, 0x43, 0xC5, 0x54, 0xFC, 0x1F, 0x21, 0x63, 0xA5, 0xF4, 0x07, 0x09, 0x1B, 0x2D, 0x77, 0x99, 0xB0, 0xCB, 0x46, 0xCA, 0x45, 0xCF, 0x4A, 0xDE, 0x79, 0x8B, 0x86, 0x91, 0xA8, 0xE3, 0x3E, 0x42, 0xC6, 0x51, 0xF3, 0x0E, 0x12, 0x36, 0x5A, 0xEE, 0x29, 0x7B, 0x8D, 0x8C, 0x8F, 0x8A, 0x85, 0x94, 0xA7, 0xF2, 0x0D, 0x17, 0x39, 0x4B, 0xDD, 0x7C, 0x84, 0x97, 0xA2, 0xFD, 0x1C, 0x24, 0x6C, 0xB4, 0xC7, 0x52, 0xF6, 0x01 };
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private static readonly byte[] GF256Log = new byte[] { 0x00, 0x00, 0x19, 0x01, 0x32, 0x02, 0x1A, 0xC6, 0x4B, 0xC7, 0x1B, 0x68, 0x33, 0xEE, 0xDF, 0x03, 0x64, 0x04, 0xE0, 0x0E, 0x34, 0x8D, 0x81, 0xEF, 0x4C, 0x71, 0x08, 0xC8, 0xF8, 0x69, 0x1C, 0xC1, 0x7D, 0xC2, 0x1D, 0xB5, 0xF9, 0xB9, 0x27, 0x6A, 0x4D, 0xE4, 0xA6, 0x72, 0x9A, 0xC9, 0x09, 0x78, 0x65, 0x2F, 0x8A, 0x05, 0x21, 0x0F, 0xE1, 0x24, 0x12, 0xF0, 0x82, 0x45, 0x35, 0x93, 0xDA, 0x8E, 0x96, 0x8F, 0xDB, 0xBD, 0x36, 0xD0, 0xCE, 0x94, 0x13, 0x5C, 0xD2, 0xF1, 0x40, 0x46, 0x83, 0x38, 0x66, 0xDD, 0xFD, 0x30, 0xBF, 0x06, 0x8B, 0x62, 0xB3, 0x25, 0xE2, 0x98, 0x22, 0x88, 0x91, 0x10, 0x7E, 0x6E, 0x48, 0xC3, 0xA3, 0xB6, 0x1E, 0x42, 0x3A, 0x6B, 0x28, 0x54, 0xFA, 0x85, 0x3D, 0xBA, 0x2B, 0x79, 0x0A, 0x15, 0x9B, 0x9F, 0x5E, 0xCA, 0x4E, 0xD4, 0xAC, 0xE5, 0xF3, 0x73, 0xA7, 0x57, 0xAF, 0x58, 0xA8, 0x50, 0xF4, 0xEA, 0xD6, 0x74, 0x4F, 0xAE, 0xE9, 0xD5, 0xE7, 0xE6, 0xAD, 0xE8, 0x2C, 0xD7, 0x75, 0x7A, 0xEB, 0x16, 0x0B, 0xF5, 0x59, 0xCB, 0x5F, 0xB0, 0x9C, 0xA9, 0x51, 0xA0, 0x7F, 0x0C, 0xF6, 0x6F, 0x17, 0xC4, 0x49, 0xEC, 0xD8, 0x43, 0x1F, 0x2D, 0xA4, 0x76, 0x7B, 0xB7, 0xCC, 0xBB, 0x3E, 0x5A, 0xFB, 0x60, 0xB1, 0x86, 0x3B, 0x52, 0xA1, 0x6C, 0xAA, 0x55, 0x29, 0x9D, 0x97, 0xB2, 0x87, 0x90, 0x61, 0xBE, 0xDC, 0xFC, 0xBC, 0x95, 0xCF, 0xCD, 0x37, 0x3F, 0x5B, 0xD1, 0x53, 0x39, 0x84, 0x3C, 0x41, 0xA2, 0x6D, 0x47, 0x14, 0x2A, 0x9E, 0x5D, 0x56, 0xF2, 0xD3, 0xAB, 0x44, 0x11, 0x92, 0xD9, 0x23, 0x20, 0x2E, 0x89, 0xB4, 0x7C, 0xB8, 0x26, 0x77, 0x99, 0xE3, 0xA5, 0x67, 0x4A, 0xED, 0xDE, 0xC5, 0x31, 0xFE, 0x18, 0x0D, 0x63, 0x8C, 0x80, 0xC0, 0xF7, 0x70, 0x07 };
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private static int GF256Mul(int a, int b) => (a == 0 || b == 0) ? 0 : GF256Exp[(GF256Log[a] + GF256Log[b]) % 0xFF];
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private void DescrambleChunk(Span<byte> input)
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{
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byte[] vector = new byte[0x10];
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for (int i = 0; i < 3; i++)
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{
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for (int j = 0; j < 0x10; j++)
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{
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int k = mhy.MhyShiftRow[(2 - i) * 0x10 + j];
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int idx = j % 8;
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vector[j] = (byte)(mhy.MhyKey[idx] ^ mhy.SBox[(j % 4 * 0x100) | GF256Mul(mhy.MhyMul[idx], input[k])]);
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}
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vector.CopyTo(input);
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}
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}
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private void Descramble(Span<byte> input, int blockSize, int entrySize)
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{
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var roundedEntrySize = (entrySize + 0xF) / 0x10 * 0x10;
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for (int i = 0; i < roundedEntrySize; i += 0x10)
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DescrambleChunk(input.Slice(i + 4, 0x10));
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for (int i = 0; i < 4; i++)
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input[i] ^= input[i + 4];
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var finished = false;
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var currentEntry = roundedEntrySize + 4;
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while (currentEntry < blockSize && !finished)
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{
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for (int i = 0; i < entrySize; i++)
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{
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input[i + currentEntry] ^= input[i + 4];
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if (i + currentEntry >= blockSize - 1)
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{
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finished = true;
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break;
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}
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}
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currentEntry += entrySize;
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}
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}
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public void DescrambleHeader(Span<byte> input) => Descramble(input, 0x39, 0x1C);
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public void DescrambleEntry(Span<byte> input) => Descramble(input, Math.Min(input.Length, 0x21), 8);
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#endregion
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}
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}
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Block a user