/*

 * Copyright (c) 2005,2006 INRIA

 * All rights reserved.

 *

 * 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 "ns3/simulator.h"

#include "ns3/system-file.h"

#include "pcap-writer.h"

#include "packet.h"

namespace ns3 {

enum {

    PCAP_ETHERNET = 1

};

PcapWriter::PcapWriter ()

{

    m_writer = 0;

}

PcapWriter::~PcapWriter ()

{

    delete m_writer;

}

void

PcapWriter::Open (char const *name)

{

    m_writer = new SystemFile ();

    m_writer->Open (name);

}

void 

PcapWriter::WriteHeaderEthernet (void)

{

    Write32 (0xa1b2c3d4);

    Write16 (2);

    Write16 (4);

    Write32 (0);

    Write32 (0);

    Write32 (0xffff);

    Write32 (PCAP_ETHERNET);

}

void 

PcapWriter::WritePacket (Packet const packet)

{

    if (m_writer != 0) {

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

        uint64_t s = current / 1000000;

        uint64_t us = current % 1000000;

        Write32 (s & 0xffffffff);

        Write32 (us & 0xffffffff);

        Write32 (packet.GetSize ());

        Write32 (packet.GetSize ());

    	m_writer->Write (packet.PeekData (), packet.GetSize ());

    }

}

void

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

{

    m_writer->Write (buffer, size);

}

void

PcapWriter::Write32 (uint32_t data)

{

    m_writer->Write ((uint8_t*)&data, 4);

}

void

PcapWriter::Write16 (uint16_t data)

{

    m_writer->Write ((uint8_t*)&data, 2);

}

}; // namespace ns3