public Value gzfile(Env env, String fileName, @Optional("0") int useIncludePath)
public Zlib gzfile(Env env, String fileName, @Optional("0") int useIncludePath)
  public Value gzfile(Env env,                      String fileName,                      @Optional("0") int useIncludePath)    throws IOException, DataFormatException  {    if (fileName == null)      return BooleanValue.FALSE;    Zlib zlib = new Zlib(env,fileName,"r",useIncludePath);    return zlib.gzfile();  }