/*
 * Copyright (c) 2002-2004 The Regents of The University of Michigan
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/* @file
 * Reference counted class containing ethernet packet data
 */

#ifndef __ETHERPKT_HH__
#define __ETHERPKT_HH__

#include <iosfwd>
#include <memory>
#include <assert.h>

#include "base/refcnt.hh"
#include "base/inet.hh"
#include "sim/host.hh"

/*
 * Reference counted class containing ethernet packet data
 */
class Checkpoint;
class PacketData : public RefCounted
{
  public:
    uint8_t *data;
    int length;

  protected:
    uint8_t *_eth;
    uint8_t *_ip;
    uint8_t *_tcp;
    uint8_t *_udp;

    void doext();
    void ext()
    {
        if (_eth != data)
            doext();
    }

  public:
    PacketData() : data(NULL), length(0) { doext(); }
    PacketData(std::auto_ptr<uint8_t> d, int l)
        : data(d.release()), length(l) { doext(); }
    ~PacketData() { if (data) delete [] data; }

  public:
    EthHdr *eth() { ext(); return (EthHdr *)_eth; }
    IpHdr *ip() { ext(); return (IpHdr *)_ip; }
    TcpHdr *tcp() { ext(); return (TcpHdr *)_tcp; }
    UdpHdr *udp() { ext(); return (UdpHdr *)_udp; }

  public:
    void serialize(std::ostream &os);
    void unserialize(Checkpoint *cp, const std::string &section);
};

typedef RefCountingPtr<PacketData> PacketPtr;

#endif // __ETHERPKT_HH__