/* -*-  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: Emmanuelle Laprise <emmanuelle.laprise@bluekazoo.ca>

 */

#include "ns3/assert.h"

#include "ns3/log.h"

#include "ns3/trailer.h"

#include "ethernet-trailer.h"

NS_LOG_COMPONENT_DEFINE ("EthernetTrailer");

namespace ns3 {

NS_OBJECT_ENSURE_REGISTERED (EthernetTrailer);

bool EthernetTrailer::m_calcFcs = false;

EthernetTrailer::EthernetTrailer ()

{

  Init();

}

void EthernetTrailer::Init()

{

  m_fcs = 0;

}

void 

EthernetTrailer::EnableFcs (bool enable)

{

  m_calcFcs = enable;

}

bool

EthernetTrailer::CheckFcs (Ptr<Packet> p) const

{

  if (!m_calcFcs)

    {

      return true;

    } 

  else 

    {

      NS_LOG_WARN ("FCS calculation is not yet enabled");

      return false;

    }

}

void

EthernetTrailer::CalcFcs (Ptr<Packet> p)

{

  NS_LOG_WARN ("FCS calculation is not yet enabled");

}

void

EthernetTrailer::SetFcs (uint32_t fcs)

{

  m_fcs = fcs;

}

uint32_t

EthernetTrailer::GetFcs (void)

{

  return m_fcs;

}

uint32_t

EthernetTrailer::GetTrailerSize (void) const

{

  return GetSerializedSize();

}

TypeId 

EthernetTrailer::GetTypeId (void)

{

  static TypeId tid = TypeId ("ns3::EthernetTrailer")

    .SetParent<Trailer> ()

    .AddConstructor<EthernetTrailer> ()

    ;

  return tid;

}

TypeId 

EthernetTrailer::GetInstanceTypeId (void) const

{

  return GetTypeId ();

}

void 

EthernetTrailer::Print (std::ostream &os) const

{

  os << "fcs=" << m_fcs;

}

uint32_t 

EthernetTrailer::GetSerializedSize (void) const

{

  return 4;

}

void

EthernetTrailer::Serialize (Buffer::Iterator end) const

{

  Buffer::Iterator i = end;

  i.Prev(GetSerializedSize());

  i.WriteU32 (m_fcs);

}

uint32_t

EthernetTrailer::Deserialize (Buffer::Iterator end)

{

  Buffer::Iterator i = end;

  uint32_t size = GetSerializedSize();

  i.Prev(size);

  m_fcs = i.ReadU32 ();

  return size;

}

}; // namespace ns3