error in serialization

[sinda]

Hi ns3-users

I tried to send a packet at HWMP level so i added a trailer having:

  Ipv4Address address;

  double timestamp;

TseHeader::GetSerializedSize (void) const

{

  NS_LOG_FUNCTION (this);

  return 8;

}

void

TseHeader::Serialize (Buffer::Iterator start) const

{

  NS_LOG_FUNCTION (this << &start);

  uint32_t data= address.Get();

  start.WriteU32 (data);

  start.WriteU32 (timestamp);

}

I added this code in Hwmp-protocol.cc:

                  Ptr<Packet> signal = Create<Packet> ();

            SignalHeader header;

            TseHeader content;

            header.SetEntity(1);

            header.SetMessageLength(header.GetMessageLength()+ 12);

                  timestamp = ((double)Simulator::Now().GetSeconds())-timestamp;

            content.SetAddress(address);

            content.SetTimeStamp(timestamp);

            signal->AddHeader (header);

            signal->AddTrailer(content);

            QueuedPacket sin;

            sin.pkt=signal;

            sin.dst=dst;

            m_rqueue.push_back(sin);

This line ( signal->AddTrailer(content);) generates often this error:

assert failed. cond="Check (m_current)", msg="You have attempted to write after the end of the available buffer space. This usually indicates that Header::GetSerializedSize returned a size which is too small compared to what Header::Serialize is actually using.", file=./ns3/buffer.h, line=871

terminate called without an active exception

Please help me to correct this error.

[Tommaso Pecorella]

The error is in the trailer.

Remember that you can not serialize a double.

T.

[sinda]

Thank you for the response. I think that so but the error given by the debugger is in line (start.WriteU32 (data);), I don't understand why. Also, It gives an error in the serialized size.

[Tommaso Pecorella]

Triple check the trailer serialized size and effective serialized elements.

As a side note, you posted the header's code, but not the trailer one.

T.