PayloadBlock.cpp

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/*
 * PayloadBlock.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/PayloadBlock.h"
#include "ibrdtn/data/Exceptions.h"
#include <ibrcommon/thread/MutexLock.h>
#include <ibrcommon/Logger.h>

namespace dtn
{
        namespace data
        {
                const dtn::data::block_t PayloadBlock::BLOCK_TYPE = 1;

                PayloadBlock::PayloadBlock()
                 : Block(PayloadBlock::BLOCK_TYPE), _blobref(ibrcommon::BLOB::create())
                {
                }

                PayloadBlock::PayloadBlock(ibrcommon::BLOB::Reference ref)
                 : Block(PayloadBlock::BLOCK_TYPE), _blobref(ref)
                {
                }

                PayloadBlock::~PayloadBlock()
                {
                }

                ibrcommon::BLOB::Reference PayloadBlock::getBLOB() const
                {
                        return _blobref;
                }

                Length PayloadBlock::getLength() const
                {
                        return _blobref.size();
                }

                std::ostream& PayloadBlock::serialize(std::ostream &stream, Length &length) const
                {
                        ibrcommon::BLOB::Reference blobref = _blobref;
                        ibrcommon::BLOB::iostream io = blobref.iostream();

                        try {
                                ibrcommon::BLOB::copy(stream, *io, io.size());
                                length += io.size();
                        } catch (const ibrcommon::IOException &ex) {
                                throw dtn::SerializationFailedException(ex.what());
                        }

                        return stream;
                }

                std::ostream& PayloadBlock::serialize(std::ostream &stream, const Length &clip_offset, const Length &clip_length) const
                {
                        ibrcommon::BLOB::Reference blobref = _blobref;
                        ibrcommon::BLOB::iostream io = blobref.iostream();

                        try {
                                (*io).seekg(clip_offset, std::ios::beg);
                                ibrcommon::BLOB::copy(stream, *io, clip_length);
                        } catch (const ibrcommon::IOException &ex) {
                                throw dtn::SerializationFailedException(ex.what());
                        }

                        return stream;
                }

                std::istream& PayloadBlock::deserialize(std::istream &stream, const Length &length)
                {
                        // lock the BLOB
                        ibrcommon::BLOB::iostream io = _blobref.iostream();

                        // clear the blob
                        io.clear();

                        // check if the blob is ready
                        if (!(*io).good()) throw dtn::SerializationFailedException("could not open BLOB for payload");

                        // set block not processed bit to false
                        set(dtn::data::Block::FORWARDED_WITHOUT_PROCESSED, false);

                        try {
                                ibrcommon::BLOB::copy(*io, stream, length);
                        } catch (const ibrcommon::IOException &ex) {
                                throw dtn::PayloadReceptionInterrupted(length, ex.what());
                        }

                        return stream;
                }
        }
}