helper/ccnb-parser/visitors/non-negative-integer-visitor.cc

/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
/*
 * Copyright (c) 2011 University of California, Los Angeles
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
 */

#include "non-negative-integer-visitor.h"

#include "../syntax-tree/blob.h"
#include "../syntax-tree/udata.h"
#include <sstream>

namespace ns3 {
namespace ndn {
namespace CcnbParser {

boost::any
NonNegativeIntegerVisitor::visit (Blob &n) //to throw parsing error
{
  // Buffer n.m_blob;
  throw CcnbDecodingException ();
}

boost::any
NonNegativeIntegerVisitor::visit (Udata &n)
{
  // std::string n.m_udata;
  std::istringstream is (n.m_udata);
  int32_t value;
  is >> value;
  if (value<0) // value should be non-negative
    throw CcnbDecodingException ();

  return static_cast<uint32_t> (value);
}

}
}
}