public Value gzopen(Env env, String fileName, String mode, @Optional("0") int useIncludePath)
public Zlib gzopen(Env env, String fileName, String mode, @Optional("0") int useIncludePath)
  public Value gzopen(Env env,                      String fileName,                      String mode,                      @Optional("0") int useIncludePath)  {    if (fileName == null)      return BooleanValue.FALSE;    Zlib zlib = new Zlib(env, fileName, mode, useIncludePath);    return env.wrapJava(zlib);  }