/// <summary>
/// Create multi-threaded compressing XZStream. Requires more memory than single-threaded mode.
/// </summary>
public unsafe XZStream(Stream baseStream, XZCompressOptions compOpts, XZThreadedCompressOptions threadOpts)
{
XZInit.Manager.EnsureLoaded();
BaseStream = baseStream ?? throw new ArgumentNullException(nameof(baseStream));
_mode = Mode.Compress;
_disposed = false;
// Check and set XZStreamOptions
_leaveOpen = compOpts.LeaveOpen;
_bufferSize = CheckBufferSize(compOpts.BufferSize);
_workBuf = new byte[_bufferSize];
// Prepare LzmaStream and buffers
_lzmaStream = new LzmaStream();
_lzmaStreamPin = GCHandle.Alloc(_lzmaStream, GCHandleType.Pinned);
// Check LzmaMt instance
LzmaMt mt = compOpts.ToLzmaMt(threadOpts);
CheckPreset(mt.Preset);
// Initialize the encoder
LzmaRet ret = XZInit.Lib.LzmaStreamEncoderMt(_lzmaStream, mt);
XZException.CheckReturnValue(ret);
// Set possible max memory usage.
MaxMemUsage = XZInit.Lib.LzmaStreamEncoderMtMemUsage(mt);
}
/// <summary>
/// Calculate approximate memory usage of multithreaded .xz encoder
/// </summary>
/// <returns>
/// Number of bytes of memory required for encoding with the given options.
/// If an error occurs, for example due to unsupported preset or filter chain, UINT64_MAX is returned.
/// </returns>
public static ulong EncoderMultiMemUsage(XZCompressOptions compOpts, XZThreadedCompressOptions threadOpts)
{
Manager.EnsureLoaded();
LzmaMt mtOpts = compOpts.ToLzmaMt(threadOpts);
return(Lib.LzmaStreamEncoderMtMemUsage(mtOpts));
}
internal LzmaMt ToLzmaMt(XZThreadedCompressOptions threadOpts)
{
return(new LzmaMt()
{
BlockSize = threadOpts.BlockSize,
Threads = XZThreadedCompressOptions.CheckThreadCount(threadOpts.Threads),
Preset = Preset,
Check = Check,
});
}
