checkpattern.cc

COPE the first practical network coding scheme which is developped on click

/*
 * checkpattern.{cc,hh} -- element checks packets generated by SendPattern
 * Robert Morris
 *
 * Copyright (c) 1999-2000 Massachusetts Institute of Technology
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, subject to the conditions
 * listed in the Click LICENSE file. These conditions include: you must
 * preserve this copyright notice, and you cannot mention the copyright
 * holders in advertising related to the Software without their permission.
 * The Software is provided WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED. This
 * notice is a summary of the Click LICENSE file; the license in that file is
 * legally binding.
 */

#include <click/config.h>
#include "checkpattern.hh"
#include <click/glue.hh>
#include <click/confparse.hh>
CLICK_DECLS

CheckPattern::CheckPattern()
  : Element(1, 1)
{
  _len = 1;
}

CheckPattern::~CheckPattern()
{
}

int
CheckPattern::configure(Vector<String> &conf, ErrorHandler *errh)
{
  return cp_va_parse(conf, this, errh,
		     cpUnsigned, "packet length", &_len,
		     cpEnd);
}

Packet *
CheckPattern::simple_action(Packet *p)
{
  unsigned i;

  if(p->length() != _len)
    click_chatter("CheckPattern: p->length() %d _len %d",
                p->length(), _len);

  for(i = 0; i < _len && i < p->length(); i++){
    if((p->data()[i]&0xff) != (i&0xff)){
      click_chatter("CheckPattern: i=%d pkt %02x wanted %02x",
                  i, p->data()[i] & 0xff, i & 0xff);
      break;
    }
  }

  return(p);
}

CLICK_ENDDECLS
EXPORT_ELEMENT(CheckPattern)