public static unsafe int Encode(byte *source, int sourceLength, byte *target, int targetLength, LZ4CompressionLevel level = LZ4CompressionLevel.Level0)
{
if (sourceLength <= 0)
{
return(0);
}
int encoded = level == LZ4CompressionLevel.Level0
? LZ4Engine64.CompressDefault(source, target, sourceLength, targetLength)
: LZ4Engine64HC.CompressHC(source, target, sourceLength, targetLength, (int)level);
return(encoded <= 0 ? -1 : encoded);
}
/// <summary>
/// Creates a new instance of the <see cref="LZ4HighChainEncoder"/> class.
/// </summary>
/// <param name="level">Compression level.</param>
/// <param name="blockSize">Block size.</param>
/// <param name="extraBlocks">Number of extra blocks.</param>
public LZ4HighChainEncoder(LZ4CompressionLevel level, int blockSize, int extraBlocks = 0)
: base(true, blockSize, extraBlocks)
{
if (level < LZ4CompressionLevel.Level3)
{
level = LZ4CompressionLevel.Level3;
}
if (level > LZ4CompressionLevel.Level12)
{
level = LZ4CompressionLevel.Level12;
}
_context = (LZ4Context *)LZ4MemoryHelper.AllocZero(sizeof(LZ4Context));
LZ4Engine64HC.ResetStreamHC(_context, (int)level);
}
/// <see cref="LZ4Encoder.CopyDict(byte*, int)"/>
protected override int CopyDict(byte *target, int length)
{
return(LZ4Engine64HC.SaveDictHC(_context, target, length));
}
/// <see cref="LZ4Encoder.EncodeBlock(byte*, int, byte*, int)"/>
protected override int EncodeBlock(byte *source, int sourceLength, byte *target, int targetLength)
{
return(LZ4Engine64HC.CompressHCContinue(_context, source, target, sourceLength, targetLength));
}
