internal ZipReturn LocalFileOpenReadStream(Stream zipFs, bool raw, out Stream readStream, out ulong streamSize, out ushort compressionMethod)
{
streamSize = 0;
compressionMethod = _compressionMethod;
readStream = null;
zipFs.Seek((long)_dataLocation, SeekOrigin.Begin);
switch (_compressionMethod)
{
case 0:
readStream = zipFs;
streamSize = _compressedSize; // same as UncompressedSize
break;
case 8:
if (raw)
{
readStream = zipFs;
streamSize = _compressedSize;
}
else
{
//readStream = new ZlibBaseStream(zipFs, CompressionMode.Decompress, CompressionLevel.Default, ZlibStreamFlavor.DEFLATE, true);
readStream = new System.IO.Compression.DeflateStream(zipFs, System.IO.Compression.CompressionMode.Decompress, true);
streamSize = UncompressedSize;
}
break;
case 9:
readStream = new Deflate64Stream(zipFs, System.IO.Compression.CompressionMode.Decompress);
streamSize = UncompressedSize;
break;
//case 10:
// readStream = new BlastStream(zipFs);
// streamSize = UncompressedSize;
// break;
case 12:
readStream = new CBZip2InputStream(zipFs, false);
streamSize = UncompressedSize;
break;
case 14:
{
zipFs.ReadByte(); // Major version
zipFs.ReadByte(); // Minor version
int headerSize = zipFs.ReadByte() + (zipFs.ReadByte() << 8);
byte[] header = new byte[headerSize];
zipFs.Read(header, 0, headerSize);
readStream = new LzmaStream(header, zipFs);
streamSize = UncompressedSize;
break;
}
case 20:
case 93:
readStream = new ZstdSharp.DecompressionStream(zipFs);
streamSize = UncompressedSize;
break;
case 98:
{
int headerSize = 2;
byte[] header = new byte[headerSize];
zipFs.Read(header, 0, headerSize);
readStream = new PpmdStream(new PpmdProperties(header), zipFs, false);
streamSize = UncompressedSize;
break;
}
}
return(readStream == null ? ZipReturn.ZipErrorGettingDataStream : ZipReturn.ZipGood);
}
internal Stream GetStream()
{
factory.BaseStream.Seek(factory.BaseOffset + (long)PackedStreams[0].StartPosition, SeekOrigin.Begin);
Stream stream = null;
foreach (var type in GetCompressions())
{
switch (type.CompressionType)
{
case CompressionType.LZMA:
{
if (type.Coder.Method.Length == 3 &&
type.Coder.Method[0] == 3 &&
type.Coder.Method[1] == 1 &&
type.Coder.Method[2] == 1)
{
stream = new LzmaStream(type.Coder.Properties, factory.BaseStream, (long)PackedStreams[0].PackedSize, (long)UnpackedStreamSizes[0]);
}
else if (type.Coder.Method.Length == 1 &&
type.Coder.Method[0] == 33)
{
stream = new LzmaStream(type.Coder.Properties, factory.BaseStream, (long)PackedStreams[0].PackedSize, (long)UnpackedStreamSizes[0]);
}
}
break;
case CompressionType.PPMd:
{
stream = new PpmdStream(new PpmdProperties(type.Coder.Properties), factory.BaseStream, false);
}
break;
case CompressionType.BZip2:
{
stream = new BZip2Stream(factory.BaseStream, CompressionMode.Decompress, true);
}
break;
case CompressionType.BCJ:
{
stream = new BCJFilter(false, stream);
}
break;
case CompressionType.BCJ2:
{
long pos = factory.BaseStream.Position;
byte[] data1 = new byte[PackedStreams[1].PackedSize];
factory.BaseStream.Seek(factory.BaseOffset + (long)PackedStreams[1].StartPosition, SeekOrigin.Begin);
factory.BaseStream.Read(data1, 0, data1.Length);
byte[] data2 = new byte[PackedStreams[2].PackedSize];
factory.BaseStream.Seek(factory.BaseOffset + (long)PackedStreams[2].StartPosition, SeekOrigin.Begin);
factory.BaseStream.Read(data2, 0, data2.Length);
byte[] control = new byte[PackedStreams[3].PackedSize];
factory.BaseStream.Seek(factory.BaseOffset + (long)PackedStreams[3].StartPosition, SeekOrigin.Begin);
factory.BaseStream.Read(control, 0, control.Length);
factory.BaseStream.Seek(pos, SeekOrigin.Begin);
stream = new BCJ2Filter(control, data1, data2, stream);
}
break;
default:
{
throw new NotSupportedException("Unknown coder.");
}
}
}
return(stream);
}
