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

/*

 * Copyright (c) 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>

 */

#include "ns3/system-wall-clock-ms.h"

#include "ns3/packet.h"

#include "ns3/packet-history.h"

#include <iostream>

#include <sstream>

using namespace ns3;

template <int N>

class BenchHeader : public Header

{

public:

  BenchHeader ();

  bool IsOk (void) const;

private:

  virtual std::string DoGetName (void) const;

  virtual void PrintTo (std::ostream &os) const;

  virtual uint32_t GetSerializedSize (void) const;

  virtual void SerializeTo (Buffer::Iterator start) const;

  virtual uint32_t DeserializeFrom (Buffer::Iterator start);

  bool m_ok;

};

template <int N>

BenchHeader<N>::BenchHeader ()

  : m_ok (false)

{}

template <int N>

bool 

BenchHeader<N>::IsOk (void) const

{

  return m_ok;

}

template <int N>

std::string 

BenchHeader<N>::DoGetName (void) const

{

  std::ostringstream oss;

  oss << N;

  return oss.str ();

}

template <int N>

void 

BenchHeader<N>::PrintTo (std::ostream &os) const

{

  NS_ASSERT (false);

}

template <int N>

uint32_t 

BenchHeader<N>::GetSerializedSize (void) const

{

  return N;

}

template <int N>

void 

BenchHeader<N>::SerializeTo (Buffer::Iterator start) const

{

  start.WriteU8 (N, N);

}

template <int N>

uint32_t

BenchHeader<N>::DeserializeFrom (Buffer::Iterator start)

{

  m_ok = true;

  for (int i = 0; i < N; i++)

    {

      if (start.ReadU8 () != N)

        {

          m_ok = false;

        }

    }

  return N;

}

static void 

benchPtrA (uint32_t n)

{

  BenchHeader<25> ipv4;

  BenchHeader<8> udp;

  for (uint32_t i = 0; i < n; i++) {

      Packet p (2000);

      p.AddHeader (udp);

      p.AddHeader (ipv4);

      Packet o = p;

      o.RemoveHeader (ipv4);

      o.RemoveHeader (udp);

  }

}

static void 

benchPtrB (uint32_t n)

{

  BenchHeader<25> ipv4;

  BenchHeader<8> udp;

  for (uint32_t i = 0; i < n; i++) {

      Packet p (2000);

      p.AddHeader (udp);

      p.AddHeader (ipv4);

  }

}

static void

ptrC2 (Packet p)

{

  BenchHeader<8> udp;

  p.RemoveHeader (udp);

}

static void 

ptrC1 (Packet p)

{

  BenchHeader<25> ipv4;

  p.RemoveHeader (ipv4);

  ptrC2 (p);

}

static void

benchPtrC (uint32_t n)

{

  BenchHeader<25> ipv4;

  BenchHeader<8> udp;

  for (uint32_t i = 0; i < n; i++) {

      Packet p (2000);

      p.AddHeader (udp);

      p.AddHeader (ipv4);

      ptrC1 (p);

  }

}

static void

runBench (void (*bench) (uint32_t), uint32_t n, char const *name)

{

  SystemWallClockMs time;

  time.Start ();

  (*bench) (n);

  unsigned long long deltaMs = time.End ();

  double ps = n;

  ps *= 1000;

  ps /= deltaMs;

  std::cout << name<<"=" << ps << " packets/s" << std::endl;

}

int main (int argc, char *argv[])

{

  uint32_t n = 0;

  while (argc > 0) {

      if (strncmp ("--n=", argv[0],strlen ("--n=")) == 0) 

        {

          char const *nAscii = argv[0] + strlen ("--n=");

          n = atoi (nAscii);

        }

      if (strncmp ("--enable-metadata", argv[0], strlen ("--enable-metadata")) == 0)

        {

          Packet::EnableMetadata ();

        }

      argc--;

      argv++;

  }

  runBench (&benchPtrA, n, "a");

  runBench (&benchPtrB, n, "b");

  runBench (&benchPtrC, n, "c");

  return 0;

}