# File lib_ctrl/rucy/jconv.rb, line 8
    def jconv(data)
      return '' if data.empty?
      begin
        Uconv.u8tou16(data)    # test UTF-8
        return data
      rescue Uconv::Error
        # auto-conversion of Japanese encoding
        return Uconv.euctou8(NKF.nkf('-e', data))
      end
    end