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

/*

 * Copyright (c) 2011 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>

 */

// TCP options that are specified in RFC 793 (kinds 0, 1, and 2)

#include "tcp-option-rfc793.h"

#include "ns3/log.h"

namespace ns3 {

NS_LOG_COMPONENT_DEFINE ("TcpOptionRfc793");

NS_OBJECT_ENSURE_REGISTERED (TcpOptionEnd);

TcpOptionEnd::TcpOptionEnd () : TcpOption ()

{

}

TcpOptionEnd::~TcpOptionEnd ()

{

}

TypeId

TcpOptionEnd::GetTypeId (void)

{

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

    .SetParent<TcpOption> ()

    .AddConstructor<TcpOptionEnd> ()

  ;

  return tid;

}

TypeId

TcpOptionEnd::GetInstanceTypeId (void) const

{

  return GetTypeId ();

}

void

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

{

  os << "EOL";

}

uint32_t

TcpOptionEnd::GetSerializedSize (void) const

{

  return 1;

}

void

TcpOptionEnd::Serialize (Buffer::Iterator start) const

{

  Buffer::Iterator i = start;

  i.WriteU8 (GetKind ());

}

uint32_t

TcpOptionEnd::Deserialize (Buffer::Iterator start)

{

  Buffer::Iterator i = start;

  uint8_t readKind = i.ReadU8 ();

  if (readKind != GetKind ())

    {

      NS_LOG_WARN ("Malformed END option");

      return 0;

    }

  return GetSerializedSize ();

}

uint8_t

TcpOptionEnd::GetKind (void) const

{

  return TcpOption::END;

}

// Tcp Option NOP

NS_OBJECT_ENSURE_REGISTERED (TcpOptionNOP);

TcpOptionNOP::TcpOptionNOP ()

  : TcpOption ()

{

}

TcpOptionNOP::~TcpOptionNOP ()

{

}

TypeId

TcpOptionNOP::GetTypeId (void)

{

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

    .SetParent<TcpOption> ()

    .AddConstructor<TcpOptionNOP> ()

  ;

  return tid;

}

TypeId

TcpOptionNOP::GetInstanceTypeId (void) const

{

  return GetTypeId ();

}

void

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

{

  os << "NOP";

}

uint32_t

TcpOptionNOP::GetSerializedSize (void) const

{

  return 1;

}

void

TcpOptionNOP::Serialize (Buffer::Iterator start) const

{

  Buffer::Iterator i = start;

  i.WriteU8 (GetKind ());

}

uint32_t

TcpOptionNOP::Deserialize (Buffer::Iterator start)

{

  Buffer::Iterator i = start;

  uint8_t readKind = i.ReadU8 ();

  if (readKind != GetKind ())

    {

      NS_LOG_WARN ("Malformed NOP option");

      return 0;

    }

  return GetSerializedSize ();

}

uint8_t

TcpOptionNOP::GetKind (void) const

{

  return TcpOption::NOP;

}

// Tcp Option MSS

NS_OBJECT_ENSURE_REGISTERED (TcpOptionMSS);

TcpOptionMSS::TcpOptionMSS ()

  : TcpOption (),

    m_mss (1460)

{

}

TcpOptionMSS::~TcpOptionMSS ()

{

}

TypeId

TcpOptionMSS::GetTypeId (void)

{

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

    .SetParent<TcpOption> ()

    .AddConstructor<TcpOptionMSS> ()

  ;

  return tid;

}

TypeId

TcpOptionMSS::GetInstanceTypeId (void) const

{

  return GetTypeId ();

}

void

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

{

  os << "MSS:" << m_mss;

}

uint32_t

TcpOptionMSS::GetSerializedSize (void) const

{

  return 4;

}

void

TcpOptionMSS::Serialize (Buffer::Iterator start) const

{

  Buffer::Iterator i = start;

  i.WriteU8 (GetKind ()); // Kind

  i.WriteU8 (4); // Length

  i.WriteHtonU16 (m_mss); // Max segment size

}

uint32_t

TcpOptionMSS::Deserialize (Buffer::Iterator start)

{

  Buffer::Iterator i = start;

  uint8_t readKind = i.ReadU8 ();

  if (readKind != GetKind ())

    {

      NS_LOG_WARN ("Malformed MSS option");

      return 0;

    }

  uint8_t size = i.ReadU8 ();

  NS_ASSERT (size == 4);

  m_mss = i.ReadNtohU16 ();

  return GetSerializedSize ();

}

uint8_t

TcpOptionMSS::GetKind (void) const

{

  return TcpOption::MSS;

}

uint16_t

TcpOptionMSS::GetMSS (void) const

{

  return m_mss;

}

void

TcpOptionMSS::SetMSS (uint16_t mss)

{

  m_mss = mss;

}

} // namespace ns3