# File lib/Dnsruby/message.rb, line 307
    def encode
      if ((@tsigkey) && @tsigstate == :Unsigned && !@signing)
        @signing = true
        sign!
        @signing = false
      end
      return MessageEncoder.new {|msg|
        header = @header
        header.encode(msg)
        @question.each {|q|
          msg.put_name(q.qname)
          msg.put_pack('nn', q.qtype.code, q.qclass.code)
        }
        [@answer, @authority, @additional].each {|rr|
          rr.each {|r|
            name = r.name
            ttl = r.ttl
            if (r.type == Types.TSIG)
              msg.put_name(name, true)
            else
              msg.put_name(name)
            end
            msg.put_pack('nnN', r.type.code, r.klass.code, ttl)
            msg.put_length16 {r.encode_rdata(msg)}
          }
        }
      }.to_s
    end