packet.cc

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.

#include "packet.h"
#include <stdlib.h>
#include <string.h>

int hdr_cmn::offset_;
int hdr_ip::offset_;

extern int nsport_headersize;
int big_hdr_size = 0;

Packet::Packet()
{
  //printf("Allocating new Packet of size %d.\n", nsport_headersize);
  bits_ = 0;
  size_ = 0;
  data_ = 0;
  hdrlen_ = nsport_headersize;
    //sizeof(hdr_cmn) + sizeof(hdr_ip) + sizeof(hdr_lift);
  
}

Packet *
Packet::copy()
{
  Packet *pkt;
  
  pkt = alloc();
  memcpy(pkt->bits_, bits_, hdrlen_);
  
  if (data_)
    {
      pkt->data_ = (unsigned char *)malloc(size_);
      memcpy(pkt->data_, data_, size_);
    }
  pkt->hdrlen_ = hdrlen_;
  pkt->size_ = size_;

  return pkt;
}


PacketHeaderClass::PacketHeaderClass(char *mystring, int size)
{
  size_ = size;
}