private int ApplyDict(int index)
{
var dictStart = Math.Max(index - Mem.K64, 0);
var dictSize = index - dictStart;
LZ4_xx.LZ4_setStreamDecode(_context, _outputBuffer + dictStart, dictSize);
return(index);
}
/// <summary>Decompresses data from given buffer.</summary>
/// <param name="source">Input buffer.</param>
/// <param name="sourceLength">Input buffer length.</param>
/// <param name="target">Output buffer.</param>
/// <param name="targetLength">Output buffer length.</param>
/// <returns>Number of bytes written, or negative value if output buffer is too small.</returns>
public static unsafe int Decode(
byte *source, int sourceLength,
byte *target, int targetLength)
{
if (sourceLength <= 0)
{
return(0);
}
var decoded = LZ4_xx.LZ4_decompress_safe(source, target, sourceLength, targetLength);
return(decoded <= 0 ? -1 : decoded);
}
/// <inheritdoc /> protected override int CopyDict(byte *target, int length) => LZ4_xx.LZ4_saveDict(_context, target, length);
private int DecodeBlock(byte *source, int sourceLength, byte *target, int targetLength) => LZ4_xx.LZ4_decompress_safe_continue(_context, source, target, sourceLength, targetLength);
/// <summary>Maximum size after compression.</summary> /// <param name="length">Length of input buffer.</param> /// <returns>Maximum length after compression.</returns> public static int MaximumOutputSize(int length) => LZ4_xx.LZ4_compressBound(length);