packet.h

这是一个著名的应用层组播中间件的源码

//Copyright (c) 2004, Charles Killian, Adolfo Rodriguez, Dejan Kostic, Sooraj Bhat, and Amin Vahdat
//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 names of Duke University nor The University of
//     California, San Diego, 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.

#ifndef PACKETH
#define PACKETH

#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#define HEADER_SIZE 

#define PT_DMST 3
#define PT_NARADA 4
#define PT_saro 7

class AppData {
 public:
  unsigned char *data_;
  unsigned int size_;
};

class Packet {
 public:
  Packet();
  unsigned char *bits_;
  unsigned int hdrlen_;
  unsigned char *data_;
  unsigned int size_;

  inline unsigned char* access(int off) const {
    return (&bits_[off]);
  }
  Packet *copy();
  static inline Packet *alloc();
  static inline void free(Packet *);
};

struct hdr_ip
{
  ns_addr_t       src_;
  ns_addr_t       dst_;
  int             ttl_;
  int             fid_;
  static int offset_;
  inline static int& offset() { return offset_; }
  inline static hdr_ip* access(const Packet* p) {
    return (hdr_ip*) p->access(offset_);
  }
};

struct hdr_cmn
{
  int     size_;          // simulated packet size
  int     hdrsize_;    // size of headers
  static int offset_;
  inline static hdr_cmn* access(const Packet* p) {
    return (hdr_cmn*) p->access(offset_);
  }
  inline int& size() { return (size_); }

};


class PacketHeaderClass 
{

 public:
  PacketHeaderClass(char *mystring, int size);
  int size_;


};

inline void
Packet::free(Packet *pkt)
{
  void *tofree = pkt->bits_;
  if (tofree)
    ::free(tofree);
  pkt->bits_=NULL;
  tofree = pkt->data_;
  if (tofree) 
    {
      //      printf("Freeing real data at %x\n", tofree);
      //      sprintf((char *)tofree, "FREED");
      ::free(tofree); 
      tofree = 0;
    }
  pkt->data_=NULL;
  delete pkt;
}

inline Packet *
Packet::alloc()
{
  Packet *pkt = new Packet();
  hdr_cmn *my_cmn;
  hdr_ip *my_ip;

  pkt->bits_ = (unsigned char *) malloc(pkt->hdrlen_);
  //printf("alloc %d\n",pkt->hdrlen_);

  return pkt;
}



typedef void TclObject;

class TclClass
{
 public:
  TclClass(char *);

};

void bind (char *, void *);

#define TCL_OK 0

#endif