ScopeControlHopLimitBlock.cpp

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/*
 * ScopeControlHopLimitBlock.cpp
 *
 * Copyright (C) 2011 IBR, TU Braunschweig
 *
 * Written-by: Johannes Morgenroth <morgenroth@ibr.cs.tu-bs.de>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

#include "ibrdtn/data/ScopeControlHopLimitBlock.h"

namespace dtn
{
        namespace data
        {
                const dtn::data::block_t ScopeControlHopLimitBlock::BLOCK_TYPE = 199;

                dtn::data::Block* ScopeControlHopLimitBlock::Factory::create()
                {
                        return new ScopeControlHopLimitBlock();
                }

                ScopeControlHopLimitBlock::ScopeControlHopLimitBlock()
                 : dtn::data::Block(ScopeControlHopLimitBlock::BLOCK_TYPE)
                {
                        // set the replicate in every fragment bit
                        set(REPLICATE_IN_EVERY_FRAGMENT, true);
                }

                ScopeControlHopLimitBlock::~ScopeControlHopLimitBlock()
                {
                }

                Number ScopeControlHopLimitBlock::getHopsToLive() const
                {
                        if (_limit < _count) return 0;
                        return _limit - _count;
                }

                void ScopeControlHopLimitBlock::increment(const Number &hops)
                {
                        _count += hops;
                }

                void ScopeControlHopLimitBlock::setLimit(const Number &hops)
                {
                        _count = 0;
                        _limit = hops;
                }

                Length ScopeControlHopLimitBlock::getLength() const
                {
                        return _count.getLength() + _limit.getLength();
                }

                std::ostream& ScopeControlHopLimitBlock::serialize(std::ostream &stream, Length &length) const
                {
                        stream << _count;
                        stream << _limit;
                        length += getLength();
                        return stream;
                }

                std::istream& ScopeControlHopLimitBlock::deserialize(std::istream &stream, const Length&)
                {
                        stream >> _count;
                        stream >> _limit;
                        return stream;
                }
        } /* namespace data */
} /* namespace dtn */