iprwpatterns.cc

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

/*
 * iprwpatterns.{cc,hh} -- stores shared IPRewriter patterns
 * Eddie Kohler
 *
 * Copyright (c) 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 "iprwpatterns.hh"
#include <click/confparse.hh>
#include <click/router.hh>
#include <click/error.hh>
CLICK_DECLS

IPRewriterPatterns::IPRewriterPatterns()
  : _name_map(-1)
{
}

IPRewriterPatterns::~IPRewriterPatterns()
{
}

int
IPRewriterPatterns::configure(Vector<String> &conf, ErrorHandler *errh)
{
  // check for an earlier IPRewriterPatterns
  const Vector<Element *> &ev = router()->elements();
  for (int i = 0; i < eindex(); i++)
    if (IPRewriterPatterns *rwp = (IPRewriterPatterns *)ev[i]->cast("IPRewriterPatterns"))
      return rwp->configure(conf, errh);

  for (int i = 0; i < conf.size(); i++) {
    String word, rest;
    // allow empty patterns for convenience
    if (!cp_word(conf[i], &word, &rest))
      continue;
    cp_eat_space(rest);

    if (_name_map[word] >= 0) {
      errh->error("pattern name `%s' has already been defined", word.cc());
      continue;
    }

    IPRw::Pattern *p;
    if (IPRw::Pattern::parse(rest, &p, this, errh) >= 0) {
      p->use();
      _name_map.insert(word, _patterns.size());
      _patterns.push_back(p);
    }
  }
  return 0;
}

void
IPRewriterPatterns::cleanup(CleanupStage)
{
  for (int i = 0; i < _patterns.size(); i++)
    _patterns[i]->unuse();
}

IPRw::Pattern *
IPRewriterPatterns::find(Element *e, const String &name, ErrorHandler *errh)
{
  const Vector<Element *> &ev = e->router()->elements();
  for (int i = 0; i < ev.size(); i++)
    if (IPRewriterPatterns *rwp = (IPRewriterPatterns *)ev[i]->cast("IPRewriterPatterns")) {
      int x = rwp->_name_map[name];
      if (x >= 0)
	return rwp->_patterns[x];
      break;
    }
  errh->error("no pattern named `%s'", name.c_str());
  return 0;
}

CLICK_ENDDECLS
ELEMENT_REQUIRES(IPRw)
EXPORT_ELEMENT(IPRewriterPatterns)