/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2008-2009 Strasbourg University
 *
 * 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: David Gross <gdavid.devel@gmail.com>
 */

#ifndef IPV6_OPTION_HEADER_H
#define IPV6_OPTION_HEADER_H

#include <ostream>

#include "ns3/header.h"

namespace ns3
{

/**
 * \ingroup ipv6HeaderExt
 *
 * \brief Header for IPv6 Option.
 */
class Ipv6OptionHeader : public Header 
{
public:

  /**
   * \struct Alignment
   * \brief represents the alignment requirements of an option header
   *
   * Represented as factor*n+offset (eg. 8n+2) See \RFC{2460}.
   * No alignment is represented as 1n+0.
   */
  struct Alignment
  {
    uint8_t factor;   /**< Factor */
    uint8_t offset;   /**< Offset */
  };

  /**
   * \brief Get the type identificator.
   * \return type identificator
   */
  static TypeId GetTypeId ();

  /**
   * \brief Get the instance type ID.
   * \return instance type ID
   */
  virtual TypeId GetInstanceTypeId () const;

  /**
   * \brief Constructor.
   */
  Ipv6OptionHeader ();

  /**
   * \brief Destructor.
   */
  virtual ~Ipv6OptionHeader ();

  /**
   * \brief Set the type of the option.
   * \param type the type of the option
   */
  void SetType (uint8_t type);

  /**
   * \brief Get the type of the option.
   * \return the type of the option
   */
  uint8_t GetType () const;

  /**
   * \brief Set the option length.
   * \param length the option length
   */
  void SetLength (uint8_t length);

  /**
   * \brief Get the option length.
   * \return the option length
   */
  uint8_t GetLength () const;

  /**
   * \brief Print some information about the packet.
   * \param os output stream
   * \return info about this packet
   */
  virtual void Print (std::ostream &os) const;

  /**
   * \brief Get the serialized size of the packet.
   * \return size
   */
  virtual uint32_t GetSerializedSize () const;

  /**
   * \brief Serialize the packet.
   * \param start Buffer iterator
   */
  virtual void Serialize (Buffer::Iterator start) const;

  /**
   * \brief Deserialize the packet.
   * \param start Buffer iterator
   * \return size of the packet
   */
  virtual uint32_t Deserialize (Buffer::Iterator start);

  /**
   * \brief Get the Alignment requirement of this option header
   * \return The required alignment
   *
   * Subclasses should only implement this method, if special alignment is
   * required. Default is no alignment (1n+0).
   */
  virtual Alignment GetAlignment () const;

private:
  /**
   * \brief The type of the option.
   */
  uint8_t m_type;

  /**
   * \brief The option length.
   */
  uint8_t m_length;

  /**
   * \brief The anonymous data of this option
   */
  Buffer m_data;
};

/**
 * \ingroup ipv6HeaderExt
 *
 * \brief Header of IPv6 Option Pad1
 */
class Ipv6OptionPad1Header : public Ipv6OptionHeader
{
public:
  /**
   * \brief Get the type identificator.
   * \return type identificator
   */
  static TypeId GetTypeId ();

  /**
   * \brief Get the instance type ID.
   * \return instance type ID
   */
  virtual TypeId GetInstanceTypeId () const;

  /**
   * \brief Constructor.
   */
  Ipv6OptionPad1Header ();

  /**
   * \brief Destructor.
   */
  virtual ~Ipv6OptionPad1Header ();

  /**
   * \brief Print some information about the packet.
   * \param os output stream
   * \return info about this packet
   */
  virtual void Print (std::ostream &os) const;

  /**
   * \brief Get the serialized size of the packet.
   * \return size
   */
  virtual uint32_t GetSerializedSize () const;

  /**
   * \brief Serialize the packet.
   * \param start Buffer iterator
   */
  virtual void Serialize (Buffer::Iterator start) const;

  /**
   * \brief Deserialize the packet.
   * \param start Buffer iterator
   * \return size of the packet
   */
  virtual uint32_t Deserialize (Buffer::Iterator start);
};

/**
 * \ingroup ipv6HeaderExt
 *
 * \brief Header of IPv6 Option Padn
 */
class Ipv6OptionPadnHeader : public Ipv6OptionHeader
{
public:
  /**
   * \brief Get the type identificator.
   * \return type identificator
   */
  static TypeId GetTypeId ();

  /**
   * \brief Get the instance type ID.
   * \return instance type ID
   */
  virtual TypeId GetInstanceTypeId () const;

  /**
   * \brief Constructor.
   * \param pad Number of bytes to pad (>=2)
   */
  Ipv6OptionPadnHeader (uint32_t pad = 2);

  /**
   * \brief Destructor.
   */
  virtual ~Ipv6OptionPadnHeader ();

  /**
   * \brief Print some information about the packet.
   * \param os output stream
   * \return info about this packet
   */
  virtual void Print (std::ostream &os) const;

  /**
   * \brief Get the serialized size of the packet.
   * \return size
   */
  virtual uint32_t GetSerializedSize () const;

  /**
   * \brief Serialize the packet.
   * \param start Buffer iterator
   */
  virtual void Serialize (Buffer::Iterator start) const;

  /**
   * \brief Deserialize the packet.
   * \param start Buffer iterator
   * \return size of the packet
   */
  virtual uint32_t Deserialize (Buffer::Iterator start);
};

/**
 * \ingroup ipv6HeaderExt
 *
 * \brief Header of IPv6 Option Jumbogram
 */
class Ipv6OptionJumbogramHeader : public Ipv6OptionHeader
{
public:
  /**
   * \brief Get the type identificator.
   * \return type identificator
   */
  static TypeId GetTypeId ();

  /**
   * \brief Get the instance type ID.
   * \return instance type ID
   */
  virtual TypeId GetInstanceTypeId () const;

  /**
   * \brief Constructor.
   */
  Ipv6OptionJumbogramHeader ();

  /**
   * \brief Destructor.
   */
  virtual ~Ipv6OptionJumbogramHeader ();

  /**
   * \brief Set the data length.
   * \param dataLength the data length
   */
  void SetDataLength (uint32_t dataLength);

  /**
   * \brief Get the data length.
   * \return the data length
   */
  uint32_t GetDataLength () const;

  /**
   * \brief Print some information about the packet.
   * \param os output stream
   * \return info about this packet
   */
  virtual void Print (std::ostream &os) const;

  /**
   * \brief Get the serialized size of the packet.
   * \return size
   */
  virtual uint32_t GetSerializedSize () const;

  /**
   * \brief Serialize the packet.
   * \param start Buffer iterator
   */
  virtual void Serialize (Buffer::Iterator start) const;

  /**
   * \brief Deserialize the packet.
   * \param start Buffer iterator
   * \return size of the packet
   */
  virtual uint32_t Deserialize (Buffer::Iterator start);

  /**
   * \brief Get the Alignment requirement of this option header
   * \return The required alignment
   */
  virtual Alignment GetAlignment () const;

private:
  /**
   * \brief The data length.
   */
  uint32_t m_dataLength;
};

/**
 * \ingroup ipv6HeaderExt
 *
 * \brief Header of IPv6 Option Router Alert
 */
class Ipv6OptionRouterAlertHeader : public Ipv6OptionHeader
{
public:
  /**
   * \brief Get the type identificator.
   * \return type identificator
   */
  static TypeId GetTypeId ();

  /**
   * \brief Get the instance type ID.
   * \return instance type ID
   */
  virtual TypeId GetInstanceTypeId () const;

  /**
   * \brief Constructor.
   */
  Ipv6OptionRouterAlertHeader ();

  /**
   * \brief Destructor.
   */
  virtual ~Ipv6OptionRouterAlertHeader ();

  /**
   * \brief Set the field "value".
   * \param value the value to be set.
   */
  void SetValue (uint16_t value);

  /**
   * \brief Get the field "value".
   * \return the field "value"
   */
  uint16_t GetValue () const;

  /**
   * \brief Print some information about the packet.
   * \param os output stream
   * \return info about this packet
   */
  virtual void Print (std::ostream &os) const;

  /**
   * \brief Get the serialized size of the packet.
   * \return size
   */
  virtual uint32_t GetSerializedSize () const;

  /**
   * \brief Serialize the packet.
   * \param start Buffer iterator
   */
  virtual void Serialize (Buffer::Iterator start) const;

  /**
   * \brief Deserialize the packet.
   * \param start Buffer iterator
   * \return size of the packet
   */
  virtual uint32_t Deserialize (Buffer::Iterator start);

  /**
   * \brief Get the Alignment requirement of this option header
   * \return The required alignment
   */
  virtual Alignment GetAlignment () const;

private:
  /**
   * \brief The value.
   */
  uint16_t m_value;
};

} // namespace ns3

#endif /* IPV6_OPTION_HEADER_H */

