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

/*

 * Copyright (c) 2009 MIRKO BANCHI

 *

 * 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: Mirko Banchi <mk.banchi@gmail.com>

 */

#ifndef MSDU_STANDARD_AGGREGATOR_H

#define MSDU_STANDARD_AGGREGATOR_H

#include "msdu-aggregator.h"

namespace ns3 {

class MsduStandardAggregator : public MsduAggregator

{

public:

  static TypeId GetTypeId (void);

  MsduStandardAggregator ();

  ~MsduStandardAggregator ();

  /**

   * \param packet Packet we have to insert into </i>aggregatedPacket</i>.

   * \param aggregatedPacket Packet that will contain <i>packet</i>, if aggregation is possible, 

   * \param src Source address of <i>packet</i>.

   * \param dest Destination address of <i>packet</i>.

   * 

   * This method performs an MSDU aggregation.

   * Returns true if <i>packet</i> can be aggregated to <i>aggregatedPacket</i>, false otherwise. 

   */

  virtual bool Aggregate (Ptr<const Packet> packet, Ptr<Packet> aggregatedPacket,

                          Mac48Address src, Mac48Address dest);

private:

  /*  Calculates how much padding must be added to the end of aggregated packet,

      after that a new packet is added.

      Each A-MSDU subframe is padded so that its length is multiple of 4 octects.

   */

  uint32_t CalculatePadding (Ptr<const Packet> packet);

  uint32_t m_maxAmsduLength;

};

}  //namespace ns3

#endif /* MSDU_STANDARD_AGGREGATOR_H */