/// <summary>Flushes current chunk.</summary> private void FlushCurrentChunk() { if (_bufferOffset <= 0) { return; } var compressed = new byte[_bufferOffset]; var compressedLength = _highCompression ? LZ4Codec.EncodeHC(_buffer, 0, _bufferOffset, compressed, 0, _bufferOffset) : LZ4Codec.Encode(_buffer, 0, _bufferOffset, compressed, 0, _bufferOffset); if (compressedLength <= 0 || compressedLength >= _bufferOffset) { // incompressible block compressed = _buffer; compressedLength = _bufferOffset; } var isCompressed = compressedLength < _bufferOffset; if (fileHeaderInfo == null) { fileHeaderInfo = new LZ4FileHeaderInfo(); fileHeaderInfo.FrameDescriptor_BD_BlockMaxSize = BlockMaximumSize.Block64K; fileHeaderInfo.FrameDescriptor_FLG_BChecksum = false; fileHeaderInfo.FrameDescriptor_FLG_BIndependence = true; fileHeaderInfo.FrameDescriptor_FLG_ContentChecksum = true; fileHeaderInfo.FrameDescriptor_FLG_ContentSize = false; fileHeaderInfo.FrameDescriptor_FLG_Version = 64; //U32 const xxh = XXH32(header, length, 0); //return (BYTE)(xxh >> 8); // *dstPtr = LZ4F_headerChecksum(headerStart, dstPtr - headerStart); LZ4FileHeaderInfo.WriteHeader(_innerStream, fileHeaderInfo); } LZ4HeaderChunkInfo chunkInfo = new LZ4HeaderChunkInfo(); chunkInfo.IsCompressed = true; chunkInfo.ChunkSize = compressedLength; LZ4HeaderChunkInfo.WriteHeader(_innerStream, chunkInfo); _innerStream.Write(compressed, 0, compressedLength); _bufferOffset = 0; }
private async Task FlushCurrentChunkAsync() { if (_bufferOffset <= 0) { return; } var compressed = new byte[_bufferOffset]; var compressedLength = _highCompression ? LZ4Codec.EncodeHC(_buffer, 0, _bufferOffset, compressed, 0, _bufferOffset) : LZ4Codec.Encode(_buffer, 0, _bufferOffset, compressed, 0, _bufferOffset); if (compressedLength <= 0 || compressedLength >= _bufferOffset) { // incompressible block compressed = _buffer; compressedLength = _bufferOffset; } var isCompressed = compressedLength < _bufferOffset; var flags = ChunkFlags.None; if (isCompressed) { flags |= ChunkFlags.Compressed; } if (_highCompression) { flags |= ChunkFlags.HighCompression; } await WriteVarIntAsync((ulong)flags).ConfigureAwait(false); await WriteVarIntAsync((ulong)_bufferOffset).ConfigureAwait(false); if (isCompressed) { await WriteVarIntAsync((ulong)compressedLength).ConfigureAwait(false); } await _innerStream.WriteAsync(compressed, 0, compressedLength).ConfigureAwait(false); _bufferOffset = 0; }
/// <summary>Flushes current chunk.</summary> private void FlushCurrentChunk() { if (_bufferOffset <= 0) { return; } var compressed = new byte[_bufferOffset]; var compressedLength = _highCompression ? LZ4Codec.EncodeHC(_buffer, 0, _bufferOffset, compressed, 0, _bufferOffset) : LZ4Codec.Encode(_buffer, 0, _bufferOffset, compressed, 0, _bufferOffset); if (compressedLength <= 0 || compressedLength >= _bufferOffset) { // incompressible block compressed = _buffer; compressedLength = _bufferOffset; } var isCompressed = compressedLength < _bufferOffset; var flags = ChunkFlags.None; if (isCompressed) { flags |= ChunkFlags.Compressed; } if (_highCompression) { flags |= ChunkFlags.HighCompression; } WriteVarInt((ulong)flags); WriteVarInt((ulong)_bufferOffset); if (isCompressed) { WriteVarInt((ulong)compressedLength); } _innerStream.Write(compressed, 0, compressedLength); _bufferOffset = 0; }