private void ReadBlocks(EndianBinaryReader reader, Stream blocksStream)
{
foreach (var blockInfo in m_BlocksInfo)
{
var compressionType = (CompressionType)(blockInfo.flags & StorageBlockFlags.CompressionTypeMask);
switch (compressionType)
{
case CompressionType.None:
{
reader.BaseStream.CopyTo(blocksStream, blockInfo.compressedSize);
break;
}
case CompressionType.Lzma:
{
SevenZipHelper.StreamDecompress(reader.BaseStream, blocksStream, blockInfo.compressedSize, blockInfo.uncompressedSize);
break;
}
case CompressionType.Lz4:
case CompressionType.Lz4HC:
{
var compressedSize = (int)blockInfo.compressedSize;
var compressedBytes = BigArrayPool <byte> .Shared.Rent(compressedSize);
reader.Read(compressedBytes, 0, compressedSize);
var uncompressedSize = (int)blockInfo.uncompressedSize;
var uncompressedBytes = BigArrayPool <byte> .Shared.Rent(uncompressedSize);
var numWrite = LZ4Codec.Decode(compressedBytes, 0, compressedSize, uncompressedBytes, 0, uncompressedSize);
if (numWrite != uncompressedSize)
{
throw new IOException($"Lz4 decompression error, write {numWrite} bytes but expected {uncompressedSize} bytes");
}
blocksStream.Write(uncompressedBytes, 0, uncompressedSize);
BigArrayPool <byte> .Shared.Return(compressedBytes);
BigArrayPool <byte> .Shared.Return(uncompressedBytes);
break;
}
default:
throw new IOException($"Unsupported compression type {compressionType}");
}
}
blocksStream.Position = 0;
}
private void ReadBlocks(EndianBinaryReader reader, Stream blocksStream)
{
foreach (var blockInfo in m_BlocksInfo)
{
switch (blockInfo.flags & 0x3F) //kStorageBlockCompressionTypeMask
{
default: //None
{
reader.BaseStream.CopyTo(blocksStream, blockInfo.compressedSize);
break;
}
case 1: //LZMA
{
SevenZipHelper.StreamDecompress(reader.BaseStream, blocksStream, blockInfo.compressedSize, blockInfo.uncompressedSize);
break;
}
case 2: //LZ4
case 3: //LZ4HC
{
var compressedSize = (int)blockInfo.compressedSize;
var compressedBytes = BigArrayPool <byte> .Shared.Rent(compressedSize);
reader.Read(compressedBytes, 0, compressedSize);
var uncompressedSize = (int)blockInfo.uncompressedSize;
var uncompressedBytes = BigArrayPool <byte> .Shared.Rent(uncompressedSize);
var numWrite = LZ4Codec.Decode(compressedBytes, 0, compressedSize, uncompressedBytes, 0, uncompressedSize);
if (numWrite != uncompressedSize)
{
throw new IOException($"Lz4 decompression error, write {numWrite} bytes but expected {uncompressedSize} bytes");
}
blocksStream.Write(uncompressedBytes, 0, uncompressedSize);
BigArrayPool <byte> .Shared.Return(compressedBytes);
BigArrayPool <byte> .Shared.Return(uncompressedBytes);
break;
}
}
}
blocksStream.Position = 0;
}