static MemoryStream UnpackStream(BinaryReader binaryReader, uint blockSize, uint decompressedSize = 0, byte compressionMethod = byte.MaxValue)
{
if (decompressedSize == 0)
{
decompressedSize = binaryReader.ReadUInt32();
}
if (compressionMethod == byte.MaxValue)
{
compressionMethod = binaryReader.ReadByte();
}
Bio.Debug("Decompressing " + blockSize + " bytes @ " + binaryReader.BaseStream.Position);
Bio.Debug(string.Format("\tCompression: {0}, decompressed size: {1}", (COMPRESSION)compressionMethod, decompressedSize));
blockSize -= 5;
var decompressedStream = new MemoryStream((int)decompressedSize);
switch ((COMPRESSION)compressionMethod)
{
case COMPRESSION.NONE:
binaryReader.BaseStream.Copy(decompressedStream, (int)blockSize);
break;
case COMPRESSION.DEFLATE:
binaryReader.BaseStream.Skip(2);
using (var deflateStream = new DeflateStream(binaryReader.BaseStream, CompressionMode.Decompress, true)) {
deflateStream.Copy(decompressedStream, (int)decompressedSize);
}
break;
case COMPRESSION.BZ2:
using (var bzip2Stream = new BZip2InputStream(binaryReader.BaseStream)) {
bzip2Stream.IsStreamOwner = false;
bzip2Stream.Copy(decompressedStream, (int)decompressedSize);
}
break;
default:
Bio.Warn("Unknown compression method, data might be encrypted and cannot be unpacked. Skipping block.");
decompressedStream.Dispose();
binaryReader.BaseStream.Skip(blockSize);
return(null);
}
//binaryReader.BaseStream.Skip(blockSize);
return(decompressedStream);
}
