private void ReadPre530Metadata(EndianReader reader)
{
switch (Header.Type)
{
case BundleType.UnityRaw:
{
Metadata = new BundleMetadata(m_filePath);
Metadata.ReadPre530(reader);
}
break;
case BundleType.UnityWeb:
case BundleType.HexFA:
{
// read only last chunk. wtf?
ChunkInfo chunkInfo = Header.ChunkInfos[Header.ChunkInfos.Count - 1];
using (SmartStream stream = SmartStream.CreateMemory(new byte[chunkInfo.DecompressedSize]))
{
SevenZipHelper.DecompressLZMASizeStream(reader.BaseStream, chunkInfo.CompressedSize, stream);
Metadata = new BundleMetadata(m_filePath);
using (EndianReader decompressReader = new EndianReader(stream, EndianType.BigEndian))
{
Metadata.ReadPre530(decompressReader);
}
}
}
break;
default:
throw new NotSupportedException($"Bundle type {Header.Type} isn't supported before 530 generation");
}
}
private void Read530Blocks(SmartStream bundleStream, BlockInfo[] blockInfos)
{
int cachedBlock = -1;
long dataOffset = bundleStream.Position;
BundleFileEntry[] newEntries = new BundleFileEntry[Metadata.Entries.Count];
using (SmartStream blockStream = SmartStream.CreateNull())
{
for (int ei = 0; ei < Metadata.Entries.Count; ei++)
{
BundleFileEntry entry = Metadata.Entries[ei];
// find block corresponding to current entry
int blockIndex = 0;
long compressedOffset = 0;
long decompressedOffset = 0;
while (true)
{
BlockInfo block = blockInfos[blockIndex];
if (decompressedOffset + block.DecompressedSize > entry.Offset)
{
break;
}
blockIndex++;
compressedOffset += block.CompressedSize;
decompressedOffset += block.DecompressedSize;
}
// check does this entry use any compressed blocks
long entrySize = 0;
bool isCompressed = false;
for (int bi = blockIndex; entrySize < entry.Size; bi++)
{
BlockInfo block = blockInfos[bi];
entrySize += block.DecompressedSize;
if (block.Flags.GetCompression() != BundleCompressType.None)
{
isCompressed = true;
break;
}
}
if (isCompressed)
{
// well, at leat one block is compressed so we should copy data of current entry to separate stream
using (SmartStream entryStream = CreateStream(entry.Size))
{
long left = entry.Size;
long entryOffset = entry.Offset - decompressedOffset;
bundleStream.Position = dataOffset + compressedOffset;
// copy data of all blocks used by current entry to created stream
for (int bi = blockIndex; left > 0; bi++)
{
long blockOffset = 0;
BlockInfo block = blockInfos[bi];
if (cachedBlock == bi)
{
// some data of previous entry is in the same block as this one
// so we don't need to unpack it once again but can use cached stream
bundleStream.Position += block.CompressedSize;
}
else
{
BundleCompressType compressType = block.Flags.GetCompression();
switch (compressType)
{
case BundleCompressType.None:
blockOffset = dataOffset + compressedOffset;
blockStream.Assign(bundleStream);
break;
case BundleCompressType.LZMA:
blockStream.Move(CreateStream(block.DecompressedSize));
SevenZipHelper.DecompressLZMAStream(bundleStream, block.CompressedSize, blockStream, block.DecompressedSize);
break;
case BundleCompressType.LZ4:
case BundleCompressType.LZ4HZ:
blockStream.Move(CreateStream(block.DecompressedSize));
using (Lz4Stream lzStream = new Lz4Stream(bundleStream, block.CompressedSize))
{
long read = lzStream.Read(blockStream, block.DecompressedSize);
if (read != block.DecompressedSize)
{
throw new Exception($"Read {read} but expected {block.CompressedSize}");
}
}
break;
default:
throw new NotImplementedException($"Bundle compression '{compressType}' isn't supported");
}
cachedBlock = bi;
}
// consider next offsets:
// 1) block - if it is new stream then offset is 0, otherwise offset of this block in bundle file
// 2) entry - if this is first block for current entry then it is offset of this entry related to this block
// otherwise 0
long fragmentSize = block.DecompressedSize - entryOffset;
blockStream.Position = blockOffset + entryOffset;
entryOffset = 0;
long size = Math.Min(fragmentSize, left);
blockStream.CopyStream(entryStream, size);
compressedOffset += block.CompressedSize;
left -= size;
}
if (left < 0)
{
throw new Exception($"Read more than expected");
}
newEntries[ei] = new BundleFileEntry(entryStream, entry.FilePath, entry.Name, 0, entry.Size);
}
}
else
{
// no compressed blocks was found so we can use original bundle stream
newEntries[ei] = new BundleFileEntry(entry, dataOffset + entry.Offset);
}
}
}
Metadata.Dispose();
Metadata = new BundleMetadata(m_filePath, newEntries);
}
private void Read530Metadata(EndianReader reader, long basePosition)
{
SmartStream bundleStream = (SmartStream)reader.BaseStream;
long dataPosition = bundleStream.Position;
if (Header.Flags.IsMetadataAtTheEnd())
{
bundleStream.Position = basePosition + Header.BundleSize - Header.MetadataCompressedSize;
}
else
{
dataPosition += Header.MetadataCompressedSize;
}
BlockInfo[] blockInfos;
BundleCompressType metaCompression = Header.Flags.GetCompression();
switch (metaCompression)
{
case BundleCompressType.None:
{
long metaPosition = bundleStream.Position;
// unknown 0x10
bundleStream.Position += 0x10;
blockInfos = reader.ReadArray <BlockInfo>();
Metadata = new BundleMetadata(m_filePath);
Metadata.Read530(reader, bundleStream);
if (bundleStream.Position != metaPosition + Header.MetadataDecompressedSize)
{
throw new Exception($"Read {bundleStream.Position - metaPosition} but expected {Header.MetadataDecompressedSize}");
}
break;
}
case BundleCompressType.LZMA:
{
using (MemoryStream metaStream = new MemoryStream(new byte[Header.MetadataDecompressedSize]))
{
SevenZipHelper.DecompressLZMASizeStream(bundleStream, Header.MetadataCompressedSize, metaStream);
using (EndianReader metaReader = new EndianReader(metaStream, EndianType.BigEndian))
{
// unknown 0x10
metaReader.BaseStream.Position += 0x10;
blockInfos = metaReader.ReadArray <BlockInfo>();
Metadata = new BundleMetadata(m_filePath);
Metadata.Read530(metaReader, bundleStream);
}
if (metaStream.Position != metaStream.Length)
{
throw new Exception($"Read {metaStream.Position} but expected {metaStream.Length}");
}
}
break;
}
case BundleCompressType.LZ4:
case BundleCompressType.LZ4HZ:
{
using (MemoryStream metaStream = new MemoryStream(new byte[Header.MetadataDecompressedSize]))
{
using (Lz4Stream lzStream = new Lz4Stream(bundleStream, Header.MetadataCompressedSize))
{
long read = lzStream.Read(metaStream, Header.MetadataDecompressedSize);
metaStream.Position = 0;
if (read != Header.MetadataDecompressedSize)
{
throw new Exception($"Read {read} but expected {Header.MetadataDecompressedSize}");
}
}
using (EndianReader metaReader = new EndianReader(metaStream, EndianType.BigEndian))
{
// unknown 0x10
metaReader.BaseStream.Position += 0x10;
blockInfos = metaReader.ReadArray <BlockInfo>();
Metadata = new BundleMetadata(m_filePath);
Metadata.Read530(metaReader, bundleStream);
}
if (metaStream.Position != metaStream.Length)
{
throw new Exception($"Read {metaStream.Position} but expected {metaStream.Length}");
}
}
break;
}
default:
throw new NotSupportedException($"Bundle compression '{metaCompression}' isn't supported");
}
bundleStream.Position = dataPosition;
Read530Blocks(bundleStream, blockInfos);
}
public BundleFileBlockReader(Stream stream, BundleMetadata metadata)
{
m_stream = stream;
m_metadata = metadata;
m_dataOffset = stream.Position;
}