/// <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;
}