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

/*

 * Copyright (c) 2011 Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)

 *

 * 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: Manuel Requena <manuel.requena@cttc.es>

 */

#include "ns3/log.h"

#include "ns3/lte-pdcp-header.h"

NS_LOG_COMPONENT_DEFINE ("LtePdcpHeader");

namespace ns3 {

LtePdcpHeader::LtePdcpHeader ()

  : m_dcBit (0xff),

    m_sequenceNumber (0xfffa)

{

}

LtePdcpHeader::~LtePdcpHeader ()

{

  m_dcBit = 0xff;

  m_sequenceNumber = 0xfffb;

}

void

LtePdcpHeader::SetDcBit (uint8_t dcBit)

{

  m_dcBit = dcBit & 0x01;

}

void

LtePdcpHeader::SetSequenceNumber (uint16_t sequenceNumber)

{

  m_sequenceNumber = sequenceNumber & 0x0FFF;

}

uint8_t

LtePdcpHeader::GetDcBit () const

{

  return m_dcBit;

}

uint16_t

LtePdcpHeader::GetSequenceNumber () const

{

  return m_sequenceNumber;

}

TypeId

LtePdcpHeader::GetTypeId (void)

{

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

    .SetParent<Header> ()

    .AddConstructor<LtePdcpHeader> ()

  ;

  return tid;

}

TypeId

LtePdcpHeader::GetInstanceTypeId (void) const

{

  return GetTypeId ();

}

void LtePdcpHeader::Print (std::ostream &os)  const

{

  os << "D/C=" << (uint16_t)m_dcBit;

  os << " SN=" << m_sequenceNumber;

}

uint32_t LtePdcpHeader::GetSerializedSize (void) const

{

  return 2;

}

void LtePdcpHeader::Serialize (Buffer::Iterator start) const

{

  Buffer::Iterator i = start;

  i.WriteU8 ( (m_dcBit << 7) | (m_sequenceNumber & 0x0F00) >> 8 );

  i.WriteU8 ( (m_sequenceNumber & 0x00FF) );

}

uint32_t LtePdcpHeader::Deserialize (Buffer::Iterator start)

{

  Buffer::Iterator i = start;

  uint8_t byte_1;

  uint8_t byte_2;

  byte_1 = i.ReadU8 ();

  byte_2 = i.ReadU8 ();

  m_dcBit = (byte_1 & 0x80) > 7;

  // For now, we just support DATA PDUs

  NS_ASSERT (m_dcBit == DATA_PDU);

  m_sequenceNumber = ((byte_1 & 0x0F) << 8) | byte_2;

  return GetSerializedSize ();

}

}; // namespace ns3