public static extern int inflateReset(ref ZStream sz);
 public static extern int inflateEnd(ref ZStream sz);
 public static extern ZLibReturnCode inflate(ref ZStream sz, ZLibFlush flush);
 public static extern unsafe ZLibReturnCode inflateInit2_(ref ZStream sz, int windowBits, string version, int stream_size);
 public static extern unsafe ZLibReturnCode deflateInit2_ (ref ZStream sz, int  level, int  method, int windowBits, int memLevel, int strategy, string version, int stream_size);
 public static extern int inflateInit_(ref ZStream sz, string vs, int size);
 public static extern int deflateInit_(ref ZStream sz, int level, string vs, int size);