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

/*

 * Copyright (c) 2005,2006 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>

 */

/*

 * Documentation kindly pointed out by Tom Henderson:

 * http://wiki.ethereal.com/Development/LibpcapFileFormat

 */

#include <fstream>

#include "ns3/simulator.h"

#include "pcap-writer.h"

#include "packet.h"

namespace ns3 {

enum {

  PCAP_ETHERNET = 1,

  PCAP_PPP      = 9,

  PCAP_RAW_IP   = 101,

  PCAP_80211    = 105,

};

PcapWriter::PcapWriter ()

{

  m_writer = 0;

}

PcapWriter::~PcapWriter ()

{

  if (m_writer != 0)

    {

      m_writer->close ();

    }

  delete m_writer;

  m_writer = 0;

}

void

PcapWriter::Open (std::string const &name)

{

  m_writer = new std::ofstream ();

  m_writer->open (name.c_str ());

}

void 

PcapWriter::WriteEthernetHeader (void)

{

  WriteHeader (PCAP_ETHERNET);

}

void 

PcapWriter::WriteIpHeader (void)

{

  WriteHeader (PCAP_RAW_IP);

}

void

PcapWriter::WriteWifiHeader (void)

{

  WriteHeader (PCAP_80211);

}

void 

PcapWriter::WritePppHeader (void)

{

  WriteHeader (PCAP_PPP);

}

void 

PcapWriter::WriteHeader (uint32_t network)

{

  Write32 (0xa1b2c3d4);

  Write16 (2);

  Write16 (4);

  Write32 (0);

  Write32 (0);

  Write32 (0xffff);

  Write32 (network);

}

void 

PcapWriter::WritePacket (Ptr<const Packet> packet)

{

  if (m_writer != 0) 

    {

      uint64_t current = Simulator::Now ().GetMicroSeconds ();

      uint64_t s = current / 1000000;

      uint64_t us = current % 1000000;

      Write32 (s & 0xffffffff);

      Write32 (us & 0xffffffff);

      Write32 (packet->GetSize ());

      Write32 (packet->GetSize ());

      WriteData (packet->PeekData (), packet->GetSize ());

    }

}

void

PcapWriter::WriteData (uint8_t const*buffer, uint32_t size)

{

  m_writer->write ((char const *)buffer, size);

}

void

PcapWriter::Write32 (uint32_t data)

{

  uint8_t buffer[4];

  buffer[0] = (data >> 0) & 0xff;

  buffer[1] = (data >> 8) & 0xff;

  buffer[2] = (data >> 16) & 0xff;

  buffer[3] = (data >> 24) & 0xff;

  WriteData (buffer, 4);

}

void

PcapWriter::Write16 (uint16_t data)

{

  uint8_t buffer[2];

  buffer[0] = (data >> 0) & 0xff;

  buffer[1] = (data >> 8) & 0xff;

  WriteData (buffer, 2);

}

} // namespace ns3