private static extern ZLibError compress2(byte[] dest, ref ulong destLength, byte[] source, int sourceLength, ZLibQuality quality);

 public ZLibError Compress(byte[] dest, ref int destLength, byte[] source, int sourceLength, ZLibQuality quality)
 {
     ulong destLengthLong = (ulong)destLength;
     ZLibError z = compress2(dest, ref destLengthLong, source, sourceLength, quality);
     destLength = (int)destLengthLong;
     return z;
 }

 public static ZLibError Pack(byte[] dest, ref int destLength, byte[] source, int sourceLength, ZLibQuality quality)
 {
     return Compressor.Compress(dest, ref destLength, source, sourceLength, quality);
 }

			internal static extern ZLibError compress2(
				byte[] dest, ref int destLength, byte[] source, int sourceLength, ZLibQuality quality);

 private static extern unsafe ZLibError _Compress64(byte[] dest, ref Int32 destLenght, byte[] source, Int32 sourceLenght, ZLibQuality quality);