public unsafe void Init(Stream stream, CompressionMode mode, LZMAOptionLZMA *opts)
{
_compressedStream = stream;
_mode = mode;
_isClosed = false;
_zstreamBuff = new byte[sizeof(LZMAStreamNative)];
_zstreamHandle = GCHandle.Alloc(_zstreamBuff, GCHandleType.Pinned);
_zstream = (LZMAStreamNative *)_zstreamHandle.AddrOfPinnedObject().ToPointer();
_tmpBuffer = new byte[BufferSize];
_tmpBufferHandle = GCHandle.Alloc(_tmpBuffer, GCHandleType.Pinned);
_tmpBufferPtr = _tmpBufferHandle.AddrOfPinnedObject().ToPointer();
LZMAStatus ret;
switch (mode)
{
case CompressionMode.Compress:
// We will always use one filter, + 1 to mark the end of the filter array
var filters = stackalloc LZMAFilter[2];
filters[0].id = LZMANative.LZMA_FILTER_LZMA2;
filters[0].options = opts;
filters[1].id = LZMANative.LZMA_VLI_UNKNOWN;
ret = LZMANative.lzma_stream_encoder(_zstream, filters, LZMACheck.LZMA_CHECK_CRC64);
if (ret != LZMAStatus.LZMA_OK)
{
throw new ArgumentException(string.Format("Unable to init LZMA decoder. Return code: {0}", ret));
}
_zstream->next_out = _tmpBufferPtr;
_zstream->avail_out = (IntPtr)_tmpBuffer.Length;
break;
case CompressionMode.Decompress:
ret = LZMANative.lzma_auto_decoder(_zstream, 1024 * 1024 * 1024, 0);
if (ret != LZMAStatus.LZMA_OK)
{
throw new ArgumentException(string.Format("Unable to init LZMA decoder. Return code: {0}", ret));
}
break;
}
}
