private void ReadFileStreamMetadata(Stream stream, long basePosition)
{
BundleFileStreamHeader header = Header.FileStream;
if (header.Flags.IsBlocksInfoAtTheEnd())
{
stream.Position = basePosition + (header.Size - header.CompressedBlocksInfoSize);
}
CompressionType metaCompression = header.Flags.GetCompression();
switch (metaCompression)
{
case CompressionType.None:
{
ReadMetadata(stream, header.UncompressedBlocksInfoSize);
}
break;
case CompressionType.Lzma:
{
using (MemoryStream uncompressedStream = new MemoryStream(new byte[header.UncompressedBlocksInfoSize]))
{
SevenZipHelper.DecompressLZMAStream(stream, header.CompressedBlocksInfoSize, uncompressedStream, header.UncompressedBlocksInfoSize);
uncompressedStream.Position = 0;
ReadMetadata(uncompressedStream, header.UncompressedBlocksInfoSize);
}
}
break;
case CompressionType.Lz4:
case CompressionType.Lz4HC:
{
using (MemoryStream uncompressedStream = new MemoryStream(new byte[header.UncompressedBlocksInfoSize]))
{
using (Lz4DecodeStream decodeStream = new Lz4DecodeStream(stream, header.CompressedBlocksInfoSize))
{
decodeStream.ReadBuffer(uncompressedStream, header.UncompressedBlocksInfoSize);
}
uncompressedStream.Position = 0;
ReadMetadata(uncompressedStream, header.UncompressedBlocksInfoSize);
}
}
break;
default:
throw new NotSupportedException($"Bundle compression '{metaCompression}' isn't supported");
}
}
private void Read530Metadata(BundleReader reader, long headerSize)
{
if (Header.Flags.IsMetadataAtTheEnd())
{
reader.BaseStream.Position = Header.BundleSize - Header.MetadataCompressedSize;
}
BundleCompressType metaCompression = Header.Flags.GetCompression();
switch (metaCompression)
{
case BundleCompressType.None:
{
Metadata.Read(reader);
long expectedPosition = Header.Flags.IsMetadataAtTheEnd() ? Header.BundleSize : headerSize + Header.MetadataDecompressedSize;
if (reader.BaseStream.Position != expectedPosition)
{
throw new Exception($"Read {reader.BaseStream.Position - headerSize} but expected {Header.MetadataDecompressedSize}");
}
}
break;
case BundleCompressType.LZMA:
{
using (MemoryStream stream = new MemoryStream(new byte[Header.MetadataDecompressedSize]))
{
SevenZipHelper.DecompressLZMASizeStream(reader.BaseStream, Header.MetadataCompressedSize, stream);
using (BundleReader decompressReader = new BundleReader(stream, reader.EndianType, reader.Type, reader.Generation))
{
Metadata.Read(decompressReader);
}
if (stream.Position != Header.MetadataDecompressedSize)
{
throw new Exception($"Read {stream.Position} but expected {Header.MetadataDecompressedSize}");
}
}
}
break;
case BundleCompressType.LZ4:
case BundleCompressType.LZ4HZ:
{
using (MemoryStream stream = new MemoryStream(new byte[Header.MetadataDecompressedSize]))
{
using (Lz4DecodeStream decodeStream = new Lz4DecodeStream(reader.BaseStream, Header.MetadataCompressedSize))
{
decodeStream.ReadBuffer(stream, Header.MetadataDecompressedSize);
}
stream.Position = 0;
using (BundleReader decompressReader = new BundleReader(stream, reader.EndianType, reader.Type, reader.Generation))
{
Metadata.Read(decompressReader);
}
if (stream.Position != Header.MetadataDecompressedSize)
{
throw new Exception($"Read {stream.Position} but expected {Header.MetadataDecompressedSize}");
}
}
}
break;
default:
throw new NotSupportedException($"Bundle compression '{metaCompression}' isn't supported");
}
}
