public static int Compress(byte[] inputBuffer, ref IEnumerable <byte> outputBuffer, bool useRedHeader,
CompressionLevel level = CompressionLevel.Normal, Compressor compressor = Compressor.Kraken)
{
if (inputBuffer == null)
{
throw new ArgumentNullException(nameof(inputBuffer));
}
var inputCount = inputBuffer.Length;
if (inputCount <= 0 || inputCount > inputBuffer.Length)
{
throw new ArgumentOutOfRangeException(nameof(inputCount));
}
if (outputBuffer == null)
{
throw new ArgumentNullException(nameof(outputBuffer));
}
var result = 0;
var compressedBufferSizeNeeded = Oodle.GetCompressedBufferSizeNeeded(inputCount);
var compressedBuffer = new byte[compressedBufferSizeNeeded];
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
result = CompressionSettings.Get().UseOodle
? OodleLib.OodleLZ_Compress(inputBuffer, compressedBuffer, compressor, level)
: KrakenNative.Compress(inputBuffer, compressedBuffer, (int)level);
}
else if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
{
result = KrakenNative.Compress(inputBuffer, compressedBuffer, (int)level);
}
else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
{
result = OozNative.Kraken_Compress(inputBuffer, compressedBuffer, (int)level);
}
else
{
throw new NotImplementedException();
}
if (result == 0 || inputCount <= (result + 8))
{
outputBuffer = inputBuffer;
return(outputBuffer.Count());
}
if (useRedHeader)
{
// write KARK header
var writelist = new List <byte>()
{
0x4B, 0x41, 0x52, 0x4B //KARK, TODO: make this dependent on the compression algo
};
// write size
writelist.AddRange(BitConverter.GetBytes(inputCount));
// write compressed data
writelist.AddRange(compressedBuffer.Take(result));
outputBuffer = writelist;
}
else
{
outputBuffer = compressedBuffer.Take(result);
}
return(outputBuffer.Count());
}
