if (fileName == null) return false;
  public boolean readgzfile(Env env,                            String fileName,                            @Optional("0") int useIncludePath)    throws IOException, DataFormatException  {    if (fileName == null)      return false;    Zlib zlib = new Zlib(env, fileName,"r",useIncludePath);    env.getOut().writeStream(zlib.readgzfile());    return true;  }