/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */

/*

 * Copyright (c) 2005 INRIA

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as 

 * published by the Free Software Foundation;

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>

 */

#include "ns3/assert.h"

#include "mac-tx-middle.h"

#include "wifi-mac-header.h"

namespace ns3 {

MacTxMiddle::MacTxMiddle ()

{

  m_sequence = 0;

  for (uint8_t i = 0; i < 16; i++) 

    {

      m_qosSequences[i] = 0;

    }

}

uint16_t 

MacTxMiddle::GetNextSequenceNumberfor (const WifiMacHeader *hdr)

{

  uint16_t retval;

  if (hdr->IsQosData () &&

      !hdr->GetAddr1 ().IsBroadcast ()) 

    {

      uint8_t tid = hdr->GetQosTid ();

      NS_ASSERT (tid < 16);

      retval = m_qosSequences[tid];

      m_qosSequences[tid]++;

      m_qosSequences[tid] %= 4096;

    } 

  else 

    {

      retval = m_sequence;

      m_sequence++;

      m_sequence %= 4096;

    }

  return retval;

}

} // namespace ns3