// -------------------------------------------------------------------------------
private static unsafe byte[] PickleV0(byte *target, int targetLength, int sourceLength)
{
int diff = sourceLength - targetLength;
int llen = diff == 0 ? 0
: diff < 0x100 ? 1
: diff < 0x10000 ? 2
: 4;
byte[] result = new byte[targetLength + 1 + llen];
fixed(byte *resultPtr = result)
{
int llenFlags = llen == 4 ? 3 : llen; // 2 bits
byte flags = (byte)((llenFlags << 6) | CurrentVersion);
LZ4MemoryHelper.Poke8(resultPtr + 0, flags);
if (llen == 1)
{
LZ4MemoryHelper.Poke8(resultPtr + 1, (byte)diff);
}
else if (llen == 2)
{
LZ4MemoryHelper.Poke16(resultPtr + 1, (ushort)diff);
}
else if (llen == 4)
{
LZ4MemoryHelper.Poke32(resultPtr + 1, (uint)diff);
}
LZ4MemoryHelper.Move(resultPtr + llen + 1, target, targetLength);
}
return(result);
}