tcp-tx-buffer.h

/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2010 Adrian Sai-wah Tam
 *
 * 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: Adrian Sai-wah Tam <adrian.sw.tam@gmail.com>
 */

#ifndef TCP_TX_BUFFER_H
#define TCP_TX_BUFFER_H

#include <list>
#include "ns3/traced-value.h"
#include "ns3/trace-source-accessor.h"
#include "ns3/object.h"
#include "ns3/sequence-number.h"
#include "ns3/ptr.h"

namespace ns3 {
class Packet;

class TcpTxBuffer : public Object
{
public:
  static TypeId GetTypeId (void);
  TcpTxBuffer (uint32_t n = 0);
  virtual ~TcpTxBuffer (void);

  // Accessors

  SequenceNumber32 HeadSequence (void) const;

  SequenceNumber32 TailSequence (void) const;

  uint32_t Size (void) const;

  uint32_t MaxBufferSize (void) const;

  void SetMaxBufferSize (uint32_t n);

  uint32_t Available (void) const;

  bool Add (Ptr<Packet> p);

  uint32_t SizeFromSequence (const SequenceNumber32& seq) const;

  Ptr<Packet> CopyFromSequence (uint32_t numBytes, const SequenceNumber32& seq);

  void SetHeadSequence (const SequenceNumber32& seq);

  void DiscardUpTo (const SequenceNumber32& seq);

private:
  typedef std::list<Ptr<Packet> >::iterator BufIterator;

  TracedValue<SequenceNumber32> m_firstByteSeq; //< Sequence number of the first byte in data (SND.UNA)
  uint32_t m_size;                              //< Number of data bytes
  uint32_t m_maxBuffer;                         //< Max number of data bytes in buffer (SND.WND)
  std::list<Ptr<Packet> > m_data;               //< Corresponding data (may be null)
};

} // namepsace ns3

#endif /* TCP_TX_BUFFER_H */