docs: public byte[] read(int len) throws SQLException {
      // This is the original method, where the entire block (len bytes)
      // is retrieved in one go.
      FastpathArg[] args = new FastpathArg[2];
      args[0] = new FastpathArg(fd);
      args[1] = new FastpathArg(len);
      return fp.getData("loread", args);
    }