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);
}
public uint FastStreamManual(int blockLength, int sourceLength)
{
sourceLength = LZ4MemoryHelper.RoundUp(sourceLength, blockLength);
var targetLength = 2 * sourceLength;
var context = (LZ4Engine.StreamT *)LZ4MemoryHelper.AllocZero(sizeof(LZ4Engine.StreamT));
var source = (byte *)LZ4MemoryHelper.Alloc(sourceLength);
var target = (byte *)LZ4MemoryHelper.Alloc(targetLength);
try
{
Lorem.Fill(source, sourceLength);
var sourceP = 0;
var targetP = 0;
while (sourceP < sourceLength && targetP < targetLength)
{
targetP += LZ4Engine64.CompressFastContinue(
context,
source + sourceP,
target + targetP,
Math.Min(blockLength, sourceLength - sourceP),
targetLength - targetP,
1);
sourceP += blockLength;
}
return(Tools.Adler32(target, targetP));
}
finally
{
LZ4MemoryHelper.Free(context);
LZ4MemoryHelper.Free(source);
LZ4MemoryHelper.Free(target);
}
}
/// <see cref="LZ4Encoder.EncodeBlock(byte*, int, byte*, int)"/>
protected override int EncodeBlock(byte *source, int sourceLength, byte *target, int targetLength)
{
return(LZ4Engine64.CompressFastContinue(_context, source, target, sourceLength, targetLength, 1));
}