/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2006,2007 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: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
 */
#include <stdarg.h>
#include <iostream>
#include <sstream>
#include "ns3/test.h"
#include "ns3/header.h"
#include "ns3/trailer.h"
#include "ns3/packet.h"
#include "ns3/packet-metadata.h"

using namespace ns3;

namespace {

class HistoryHeaderBase : public Header
{
public:
  static TypeId GetTypeId (void);
  HistoryHeaderBase ();
  bool IsOk (void) const;
protected:
  void ReportError (void);
private:
  bool m_ok;
};

TypeId 
HistoryHeaderBase::GetTypeId (void)
{
  static TypeId tid = TypeId ("ns3::HistoryHeaderBase")
    .SetParent<Header> ()
  ;
  return tid;
}

HistoryHeaderBase::HistoryHeaderBase ()
  : m_ok (true)
{
}

bool
HistoryHeaderBase::IsOk (void) const
{
  return m_ok;
}
void
HistoryHeaderBase::ReportError (void)
{
  m_ok = false;
}


template <int N>
class HistoryHeader : public HistoryHeaderBase
{
public:
  HistoryHeader ();
  static TypeId GetTypeId (void);
  virtual TypeId GetInstanceTypeId (void) const;
  virtual void Print (std::ostream &os) const;
  virtual uint32_t GetSerializedSize (void) const;
  virtual void Serialize (Buffer::Iterator start) const;
  virtual uint32_t Deserialize (Buffer::Iterator start);
};

template <int N>
HistoryHeader<N>::HistoryHeader ()
  : HistoryHeaderBase ()
{
}

template <int N>
TypeId
HistoryHeader<N>::GetTypeId (void)
{
  std::ostringstream oss;
  oss << "ns3::HistoryHeader<"<<N<<">";
  static TypeId tid = TypeId (oss.str ().c_str ())
    .SetParent<HistoryHeaderBase> ()
    .AddConstructor<HistoryHeader<N> > ()
  ;
  return tid;
}

template <int N>
TypeId 
HistoryHeader<N>::GetInstanceTypeId (void) const
{
  return GetTypeId ();
}
template <int N>
void 
HistoryHeader<N>::Print (std::ostream &os) const
{
  NS_ASSERT (false);
}
template <int N>
uint32_t 
HistoryHeader<N>::GetSerializedSize (void) const
{
  return N;
}
template <int N>
void 
HistoryHeader<N>::Serialize (Buffer::Iterator start) const
{
  start.WriteU8 (N, N);
}
template <int N>
uint32_t
HistoryHeader<N>::Deserialize (Buffer::Iterator start)
{
  for (int i = 0; i < N; i++)
    {
      if (start.ReadU8 () != N)
        {
          ReportError ();
        }
    }
  return N;
}

class HistoryTrailerBase : public Trailer
{
public:
  static TypeId GetTypeId (void);
  HistoryTrailerBase ();
  bool IsOk (void) const;
protected:
  void ReportError (void);
private:
  bool m_ok;
};

TypeId 
HistoryTrailerBase::GetTypeId (void)
{
  static TypeId tid = TypeId ("ns3::HistoryTrailerBase")
    .SetParent<Trailer> ()
  ;
  return tid;
}
HistoryTrailerBase::HistoryTrailerBase ()
  : m_ok (true)
{
}
bool
HistoryTrailerBase::IsOk (void) const
{
  return m_ok;
}
void
HistoryTrailerBase::ReportError (void)
{
  m_ok = false;
}


template <int N>
class HistoryTrailer : public HistoryTrailerBase
{
public:
  HistoryTrailer ();

  static TypeId GetTypeId (void);
  virtual TypeId GetInstanceTypeId (void) const;
  virtual void Print (std::ostream &os) const;
  virtual uint32_t GetSerializedSize (void) const;
  virtual void Serialize (Buffer::Iterator start) const;
  virtual uint32_t Deserialize (Buffer::Iterator start);
private:
  bool m_ok;
};

template <int N>
HistoryTrailer<N>::HistoryTrailer ()
{
}

template <int N>
TypeId
HistoryTrailer<N>::GetTypeId (void)
{
  std::ostringstream oss;
  oss << "ns3::HistoryTrailer<"<<N<<">";
  static TypeId tid = TypeId (oss.str ().c_str ())
    .SetParent<HistoryTrailerBase> ()
    .AddConstructor<HistoryTrailer<N> > ()
  ;
  return tid;
}

template <int N>
TypeId 
HistoryTrailer<N>::GetInstanceTypeId (void) const
{
  return GetTypeId ();
}
template <int N>
void 
HistoryTrailer<N>::Print (std::ostream &os) const
{
  NS_ASSERT (false);
}
template <int N>
uint32_t 
HistoryTrailer<N>::GetSerializedSize (void) const
{
  return N;
}
template <int N>
void 
HistoryTrailer<N>::Serialize (Buffer::Iterator start) const
{
  start.Prev (N);
  start.WriteU8 (N, N);
}
template <int N>
uint32_t
HistoryTrailer<N>::Deserialize (Buffer::Iterator start)
{
  start.Prev (N);
  for (int i = 0; i < N; i++)
    {
      if (start.ReadU8 () != N)
        {
          ReportError ();
        }
    }
  return N;
}

}

namespace ns3 {

class PacketMetadataTest : public TestCase {
public:
  PacketMetadataTest ();
  virtual ~PacketMetadataTest ();
  void CheckHistory (Ptr<Packet> p, const char *file, int line, uint32_t n, ...);
  virtual void DoRun (void);
private:
  Ptr<Packet> DoAddHeader (Ptr<Packet> p);
};

PacketMetadataTest::PacketMetadataTest ()
  : TestCase ("Packet metadata")
{
}

PacketMetadataTest::~PacketMetadataTest ()
{
}

void
PacketMetadataTest::CheckHistory (Ptr<Packet> p, const char *file, int line, uint32_t n, ...)
{
  std::list<int> expected;
  va_list ap;
  va_start (ap, n);
  for (uint32_t j = 0; j < n; j++)
    {
      int v = va_arg (ap, int);
      expected.push_back (v);
    }
  va_end (ap);

  PacketMetadata::ItemIterator k = p->BeginItem ();
  std::list<int> got;
  while (k.HasNext ())
    {
      struct PacketMetadata::Item item = k.Next ();
      if (item.isFragment || item.type == PacketMetadata::Item::PAYLOAD)
        {
          got.push_back (item.currentSize);
          continue;
        }
      if (item.type == PacketMetadata::Item::HEADER)
        {
          Callback<ObjectBase *> constructor = item.tid.GetConstructor ();
          HistoryHeaderBase *header = dynamic_cast<HistoryHeaderBase *> (constructor ());
          if (header == 0)
            {
              goto error;
            }
          header->Deserialize (item.current);
          if (!header->IsOk ())
            {
              delete header;
              goto error;
            }
          delete header;
        }
      else if (item.type == PacketMetadata::Item::TRAILER)
        {
          Callback<ObjectBase *> constructor = item.tid.GetConstructor ();
          HistoryTrailerBase *trailer = dynamic_cast<HistoryTrailerBase *> (constructor ());
          if (trailer == 0)
            {
              goto error;
            }
          trailer->Deserialize (item.current);
          if (!trailer->IsOk ())
            {
              delete trailer;
              goto error;
            }
          delete trailer;
        }
      got.push_back (item.currentSize);
    }

  for (std::list<int>::iterator i = got.begin (),
       j = expected.begin ();
       i != got.end (); i++, j++)
    {
      NS_ASSERT (j != expected.end ());
      if (*j != *i)
        {
          goto error;
        }
    }
  return;
error:
  std::ostringstream failure;
  failure << "PacketMetadata error. Got:\"";
  for (std::list<int>::iterator i = got.begin (); 
       i != got.end (); i++)
    {
      failure << *i << ", ";
    }
  failure << "\", expected: \"";
  for (std::list<int>::iterator j = expected.begin ();
       j != expected.end (); j++)
    {
      failure << *j << ", ";
    }
  failure << "\"";
  NS_TEST_ASSERT_MSG_EQ_INTERNAL (false, true, failure.str (), file, line);
}

#define ADD_HEADER(p, n)                                           \
  {                                                                \
    HistoryHeader<n> header;                                       \
    p->AddHeader (header);                                         \
  }
#define ADD_TRAILER(p, n)                                          \
  {                                                                \
    HistoryTrailer<n> trailer;                                     \
    p->AddTrailer (trailer);                                       \
  }
#define REM_HEADER(p, n)                                           \
  {                                                                \
    HistoryHeader<n> header;                                       \
    p->RemoveHeader (header);                                      \
  }
#define REM_TRAILER(p, n)                                          \
  {                                                                \
    HistoryTrailer<n> trailer;                                     \
    p->RemoveTrailer (trailer);                                    \
  }
#define CHECK_HISTORY(p, ...)                                      \
  {                                                                \
    CheckHistory (p, __FILE__, __LINE__, __VA_ARGS__);             \
    uint32_t size = p->GetSerializedSize ();                       \
    uint8_t* buffer = new uint8_t[size];                           \
    p->Serialize (buffer, size);                                   \
    Ptr<Packet> otherPacket = Create<Packet> (buffer, size, true); \
    delete [] buffer;                                              \
    CheckHistory (otherPacket, __FILE__, __LINE__, __VA_ARGS__);   \
  }


Ptr<Packet>
PacketMetadataTest::DoAddHeader (Ptr<Packet> p)
{
  ADD_HEADER (p, 10);
  return p;
}

void
PacketMetadataTest::DoRun (void)
{
  PacketMetadata::Enable ();

  Ptr<Packet> p = Create<Packet> (0);
  Ptr<Packet> p1 = Create<Packet> (0);

  p = Create<Packet> (10);
  ADD_TRAILER (p, 100);
  CHECK_HISTORY (p, 2, 10, 100);


  p = Create<Packet> (10);
  ADD_HEADER (p, 1);
  ADD_HEADER (p, 2);
  ADD_HEADER (p, 3);
  CHECK_HISTORY (p, 4, 
                 3, 2, 1, 10);
  ADD_HEADER (p, 5);
  CHECK_HISTORY (p, 5, 
                 5, 3, 2, 1, 10);
  ADD_HEADER (p, 6);
  CHECK_HISTORY (p, 6, 
                 6, 5, 3, 2, 1, 10);

  p = Create<Packet> (10);
  ADD_HEADER (p, 1);
  ADD_HEADER (p, 2);
  ADD_HEADER (p, 3);
  REM_HEADER (p, 3);
  CHECK_HISTORY (p, 3, 
                 2, 1, 10);

  p = Create<Packet> (10);
  ADD_HEADER (p, 1);
  ADD_HEADER (p, 2);
  ADD_HEADER (p, 3);
  REM_HEADER (p, 3);
  REM_HEADER (p, 2);
  CHECK_HISTORY (p, 2, 
                 1, 10);

  p = Create<Packet> (10);
  ADD_HEADER (p, 1);
  ADD_HEADER (p, 2);
  ADD_HEADER (p, 3);
  REM_HEADER (p, 3);
  REM_HEADER (p, 2);
  REM_HEADER (p, 1);
  CHECK_HISTORY (p, 1, 10);

  p = Create<Packet> (10);
  ADD_HEADER (p, 1);
  ADD_HEADER (p, 2);
  ADD_HEADER (p, 3);
  p1 = p->Copy ();
  REM_HEADER (p1, 3);
  REM_HEADER (p1, 2);
  REM_HEADER (p1, 1);
  CHECK_HISTORY (p1, 1, 10);
  CHECK_HISTORY (p, 4, 
                 3, 2, 1, 10);
  ADD_HEADER (p1, 1);
  ADD_HEADER (p1, 2);
  CHECK_HISTORY (p1, 3, 
                 2, 1, 10);
  CHECK_HISTORY (p, 4, 
                 3, 2, 1, 10);
  ADD_HEADER (p, 3);
  CHECK_HISTORY (p, 5, 
                 3, 3, 2, 1, 10);
  ADD_TRAILER (p, 4);
  CHECK_HISTORY (p, 6, 
                 3, 3, 2, 1, 10, 4);
  ADD_TRAILER (p, 5);
  CHECK_HISTORY (p, 7, 
                 3, 3, 2, 1, 10, 4, 5);
  REM_HEADER (p, 3);
  CHECK_HISTORY (p, 6, 
                 3, 2, 1, 10, 4, 5);
  REM_TRAILER (p, 5);
  CHECK_HISTORY (p, 5, 
                 3, 2, 1, 10, 4);
  p1 = p->Copy ();
  REM_TRAILER (p, 4);
  CHECK_HISTORY (p, 4, 
                 3, 2, 1, 10);
  CHECK_HISTORY (p1, 5, 
                 3, 2, 1, 10, 4);
  p1->RemoveAtStart (3);
  CHECK_HISTORY (p1, 4, 
                 2, 1, 10, 4);
  p1->RemoveAtStart (1);
  CHECK_HISTORY (p1, 4, 
                 1, 1, 10, 4);
  p1->RemoveAtStart (1);
  CHECK_HISTORY (p1, 3, 
                 1, 10, 4);
  p1->RemoveAtEnd (4);
  CHECK_HISTORY (p1, 2, 
                 1, 10);
  p1->RemoveAtStart (1);
  CHECK_HISTORY (p1, 1, 10);

  p = Create<Packet> (10);
  ADD_HEADER (p, 8);
  ADD_TRAILER (p, 8);
  ADD_TRAILER (p, 8);
  p->RemoveAtStart (8+10+8);
  CHECK_HISTORY (p, 1, 8);

  p = Create<Packet> (10);
  ADD_HEADER (p, 10);
  ADD_HEADER (p, 8);
  ADD_TRAILER (p, 6);
  ADD_TRAILER (p, 7);
  ADD_TRAILER (p, 9);
  p->RemoveAtStart (5);
  p->RemoveAtEnd (12);
  CHECK_HISTORY (p, 5, 3, 10, 10, 6, 4);

  p = Create<Packet> (10);
  ADD_HEADER (p, 10);
  ADD_TRAILER (p, 6);
  p->RemoveAtEnd (18);
  ADD_TRAILER (p, 5);
  ADD_HEADER (p, 3);
  CHECK_HISTORY (p, 3, 3, 8, 5);
  p->RemoveAtStart (12);
  CHECK_HISTORY (p, 1, 4);
  p->RemoveAtEnd (2);
  CHECK_HISTORY (p, 1, 2);
  ADD_HEADER (p, 10);
  CHECK_HISTORY (p, 2, 10, 2);
  p->RemoveAtEnd (5);
  CHECK_HISTORY (p, 1, 7);

  Ptr<Packet> p2 = Create<Packet> (0);
  Ptr<Packet> p3 = Create<Packet> (0);

  p = Create<Packet> (40);
  ADD_HEADER (p, 5);
  ADD_HEADER (p, 8);
  CHECK_HISTORY (p, 3, 8, 5, 40);
  p1 = p->CreateFragment (0, 5);
  p2 = p->CreateFragment (5, 5);
  p3 = p->CreateFragment (10, 43);
  CHECK_HISTORY (p1, 1, 5);
  CHECK_HISTORY (p2, 2, 3, 2);
  CHECK_HISTORY (p3, 2, 3, 40);
  p1->AddAtEnd (p2);
  CHECK_HISTORY (p1, 2, 8, 2);
  CHECK_HISTORY (p2, 2, 3, 2);
  p1->AddAtEnd (p3);
  CHECK_HISTORY (p1, 3, 8, 5, 40);
  CHECK_HISTORY (p2, 2, 3, 2);
  CHECK_HISTORY (p3, 2, 3, 40);
  p1 = p->CreateFragment (0, 5);
  CHECK_HISTORY (p1, 1, 5);

  p3 = Create<Packet> (50);
  ADD_HEADER (p3, 8);
  CHECK_HISTORY (p3, 2, 8, 50);
  CHECK_HISTORY (p1, 1, 5);
  p1->AddAtEnd (p3);
  CHECK_HISTORY (p1, 3, 5, 8, 50);
  ADD_HEADER (p1, 5);
  CHECK_HISTORY (p1, 4, 5, 5, 8, 50);
  ADD_TRAILER (p1, 2);
  CHECK_HISTORY (p1, 5, 5, 5, 8, 50, 2);
  REM_HEADER (p1, 5);
  CHECK_HISTORY (p1, 4, 5, 8, 50, 2);
  p1->RemoveAtEnd (60);
  CHECK_HISTORY (p1, 1, 5);
  p1->AddAtEnd (p2);
  CHECK_HISTORY (p1, 2, 8, 2);
  CHECK_HISTORY (p2, 2, 3, 2);

  p3 = Create<Packet> (40);
  ADD_HEADER (p3, 5);
  ADD_HEADER (p3, 5);
  CHECK_HISTORY (p3, 3, 5, 5, 40);
  p1 = p3->CreateFragment (0, 5);
  p2 = p3->CreateFragment (5, 5);
  CHECK_HISTORY (p1, 1, 5);
  CHECK_HISTORY (p2, 1, 5);
  p1->AddAtEnd (p2);
  CHECK_HISTORY (p1, 2, 5, 5);

  p = Create<Packet> (0);
  CHECK_HISTORY (p, 0);

  p3 = Create<Packet> (0);
  ADD_HEADER (p3, 5);
  ADD_HEADER (p3, 5);
  CHECK_HISTORY (p3, 2, 5, 5);
  p1 = p3->CreateFragment (0, 4);
  p2 = p3->CreateFragment (9, 1);
  CHECK_HISTORY (p1, 1, 4);
  CHECK_HISTORY (p2, 1, 1);
  p1->AddAtEnd (p2);
  CHECK_HISTORY (p1, 2, 4, 1);


  p = Create<Packet> (2000);
  CHECK_HISTORY (p, 1, 2000);

  p = Create<Packet> ();
  ADD_TRAILER (p, 10);
  ADD_HEADER (p, 5);
  p1 = p->CreateFragment (0, 8);
  p2 = p->CreateFragment (8, 7);
  p1->AddAtEnd (p2);
  CHECK_HISTORY (p, 2, 5, 10);

  p = Create<Packet> ();
  ADD_TRAILER (p, 10);
  REM_TRAILER (p, 10);
  ADD_TRAILER (p, 10);
  CHECK_HISTORY (p, 1, 10);

  p = Create<Packet> ();
  ADD_HEADER (p, 10);
  REM_HEADER (p, 10);
  ADD_HEADER (p, 10);
  CHECK_HISTORY (p, 1, 10);

  p = Create<Packet> ();
  ADD_HEADER (p, 10);
  p = DoAddHeader (p);
  CHECK_HISTORY (p, 2, 10, 10);

  p = Create<Packet> (10);
  ADD_HEADER (p, 8);
  ADD_TRAILER (p, 8);
  ADD_TRAILER (p, 8);
  p->RemoveAtStart (8+10+8);
  CHECK_HISTORY (p, 1, 8);

  p = Create<Packet> (0);
  ADD_HEADER (p, 8);
  REM_HEADER (p, 8);
  CHECK_HISTORY (p, 0);

  p = Create<Packet> (0);
  ADD_TRAILER (p, 8);
  REM_TRAILER (p, 8);
  CHECK_HISTORY (p, 0);

  p = Create<Packet> (0);
  ADD_HEADER (p, 8);
  p->RemoveAtStart (8);
  CHECK_HISTORY (p, 0);

  p = Create<Packet> (0);
  ADD_HEADER (p, 8);
  ADD_TRAILER (p, 8);
  REM_TRAILER (p, 8);
  REM_HEADER (p, 8);
  CHECK_HISTORY (p, 0);

  p = Create<Packet> (0);
  ADD_HEADER (p, 8);
  ADD_TRAILER (p, 8);
  REM_HEADER (p, 8);
  REM_TRAILER (p, 8);
  CHECK_HISTORY (p, 0);

  p = Create<Packet> (0);
  ADD_HEADER (p, 8);
  ADD_TRAILER (p, 8);
  REM_TRAILER (p, 8);
  p->RemoveAtStart (8);
  CHECK_HISTORY (p, 0);

  p = Create<Packet> (0);
  ADD_HEADER (p, 8);
  ADD_TRAILER (p, 8);
  REM_HEADER (p, 8);
  p->RemoveAtEnd (8);
  CHECK_HISTORY (p, 0);

  p = Create<Packet> (0);
  ADD_HEADER (p, 8);
  ADD_TRAILER (p, 8);
  REM_TRAILER (p, 8);
  p->RemoveAtEnd (8);
  CHECK_HISTORY (p, 0);

  p = Create<Packet> (0);
  ADD_HEADER (p, 8);
  ADD_TRAILER (p, 8);
  REM_HEADER (p, 8);
  p->RemoveAtStart (8);
  CHECK_HISTORY (p, 0);

  p = Create<Packet> (16383);
  p = Create<Packet> (16384);


  // bug 179.
  p = Create<Packet> (40);
  p2 = p->CreateFragment (5, 5);
  p3 = p->CreateFragment (10, 30);
  ADD_HEADER (p2, 8);
  ADD_HEADER (p3, 8);
  REM_HEADER (p2, 8);
  REM_HEADER (p3, 8);
  p2->AddAtEnd (p3);


  p = Create<Packet> (1000);
  ADD_HEADER (p, 10);
  ADD_TRAILER (p, 5);
  p1 = p->Copy ();
  ADD_HEADER (p1, 20);
  REM_HEADER (p1, 20);
  REM_TRAILER (p1, 5);
  NS_TEST_EXPECT_MSG_EQ (p->GetSize (), 1015, "Correct size");


  p = Create<Packet> (1510);
  ADD_HEADER (p, 8);
  ADD_HEADER (p, 25);
  REM_HEADER (p, 25);
  ADD_HEADER (p, 1);
  p1 = p->CreateFragment (0, 1500);
  p2 = p1->Copy ();
  ADD_HEADER (p2, 24);
  NS_TEST_EXPECT_MSG_EQ (p->GetSize (), 1519, "Correct size");

  p = Create<Packet> (1000);
  ADD_HEADER (p, 2);
  ADD_TRAILER (p, 3);
  p1 = p->Copy ();
  CHECK_HISTORY (p1, 3, 2, 1000, 3);
  REM_HEADER (p, 2);
  ADD_HEADER (p, 1);
  CHECK_HISTORY (p, 3, 1, 1000, 3);
  CHECK_HISTORY (p1, 3, 2, 1000, 3);

  p = Create<Packet> (200);
  ADD_HEADER (p, 24);
  p1 = p->CreateFragment (0, 100);
  p2 = p->CreateFragment (100, 100);
  p1->AddAtEnd (p2);

  p = Create<Packet> ();
  ADD_HEADER (p, 10);
  p1 = Create<Packet> ();
  ADD_HEADER (p1, 11);
  REM_HEADER (p1, 11);
  p->AddAtEnd (p1);

  p = Create<Packet> (500);
  CHECK_HISTORY (p, 1, 500);
  ADD_HEADER (p, 10);
  CHECK_HISTORY (p, 2, 10, 500);
  REM_HEADER (p, 10);
  CHECK_HISTORY (p, 1, 500);
  p->RemoveAtEnd (10);
  CHECK_HISTORY (p, 1, 490);

  p = Create<Packet> (500);
  CHECK_HISTORY (p, 1, 500);
  ADD_TRAILER (p, 10);
  CHECK_HISTORY (p, 2, 500, 10);
  REM_TRAILER (p, 10);
  CHECK_HISTORY (p, 1, 500);
  p->RemoveAtStart (10);
  CHECK_HISTORY (p, 1, 490);

  // bug 1072
  p = Create<Packet> (500);
  ADD_HEADER (p, 10);
  ADD_HEADER (p, 20);
  ADD_HEADER (p, 5);
  CHECK_HISTORY (p, 4, 5, 20, 10, 500);
  p1 = p->CreateFragment (0,6);
  p2 = p->CreateFragment (6,535-6);
  p1->AddAtEnd (p2);

  // bug 1072#2
  p = Create<Packet> (reinterpret_cast<const uint8_t*> ("hello world"), 11);
  ADD_HEADER (p, 2);
  CHECK_HISTORY (p, 2, 2, 11);
  p1 = p->CreateFragment (0, 5);
  CHECK_HISTORY (p1, 2, 2, 3);
  p2 = p->CreateFragment (5, 8);
  CHECK_HISTORY (p2, 1, 8);

  ADD_HEADER (p1, 8+2+2*6);
  ADD_TRAILER (p1, 4);
  CHECK_HISTORY (p1, 4, 22, 2, 3, 4);
  ADD_HEADER (p2, 8+2+2*6);
  ADD_TRAILER (p2, 4);
  CHECK_HISTORY (p2, 3, 22, 8, 4);

  REM_TRAILER (p1, 4);
  REM_HEADER (p1, 8+2+2*6);
  CHECK_HISTORY (p1, 2, 2, 3);
  REM_TRAILER (p2, 4);
  REM_HEADER (p2, 8+2+2*6);
  CHECK_HISTORY (p2, 1, 8);

  p3 = p1->Copy ();
  CHECK_HISTORY (p3, 2, 2, 3);
  p3->AddAtEnd (p2);
  CHECK_HISTORY (p3, 2, 2, 11);

  CHECK_HISTORY (p, 2, 2, 11);
  REM_HEADER (p, 2);
  CHECK_HISTORY (p, 1, 11);
  REM_HEADER (p3, 2);
  CHECK_HISTORY (p3, 1, 11);

  uint8_t *buf = new uint8_t[p3->GetSize ()];
  p3->CopyData (buf, p3->GetSize ());
  std::string msg = std::string (reinterpret_cast<const char *>(buf),
                                 p3->GetSize ());
  delete [] buf;
  NS_TEST_EXPECT_MSG_EQ (msg, std::string ("hello world"), "Could not find original data in received packet");
}
//-----------------------------------------------------------------------------
class PacketMetadataTestSuite : public TestSuite
{
public:
  PacketMetadataTestSuite ();
};

PacketMetadataTestSuite::PacketMetadataTestSuite ()
  : TestSuite ("packet-metadata", UNIT)
{
  AddTestCase (new PacketMetadataTest);
}

PacketMetadataTestSuite g_packetMetadataTest;
} // namespace ns3
