NativeSerializer.cpp

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/*
 * NativeSerializer.cpp
 *
 * Copyright (C) 2013 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 "api/NativeSerializer.h"

namespace dtn
{
        namespace api
        {
                NativeCallbackStream::NativeCallbackStream(NativeSerializerCallback &cb)
                 : _output_buf(4096), _callback(cb)
                {
                        setp(&_output_buf[0], &_output_buf[4096 - 1]);
                }

                NativeCallbackStream::~NativeCallbackStream() {

                }

                int NativeCallbackStream::sync()
                {
                        int ret = std::char_traits<char>::eq_int_type(this->overflow(
                                        std::char_traits<char>::eof()), std::char_traits<char>::eof()) ? -1
                                        : 0;

                        return ret;
                }

                std::char_traits<char>::int_type NativeCallbackStream::overflow(std::char_traits<char>::int_type c)
                {
                        char *ibegin = &_output_buf[0];
                        char *iend = pptr();

                        // mark the buffer as free
                        setp(&_output_buf[0], &_output_buf[4096 - 1]);

                        if (!std::char_traits<char>::eq_int_type(c, std::char_traits<char>::eof()))
                        {
                                *iend++ = std::char_traits<char>::to_char_type(c);
                        }

                        // if there is nothing to send, just return
                        if ((iend - ibegin) == 0)
                        {
                                return std::char_traits<char>::not_eof(c);
                        }

                        _callback.payload(&_output_buf[0], (iend - ibegin));

                        return std::char_traits<char>::not_eof(c);
                }

                NativeSerializer::NativeSerializer(NativeSerializerCallback &cb, DataMode mode)
                 : _callback(cb), _mode(mode) {

                }

                NativeSerializer::~NativeSerializer() {
                }

                NativeSerializer& NativeSerializer::operator<<(const dtn::data::Bundle &obj)
                {
                        _callback.beginBundle(obj);
                        if (_mode != BUNDLE_HEADER)
                        {
                                for (dtn::data::Bundle::const_iterator it = obj.begin(); it != obj.end(); ++it) {
                                        const dtn::data::Block &block = (**it);
                                        _callback.beginBlock(block, block.getLength());

                                        if (_mode == BUNDLE_FULL)
                                        {
                                                dtn::data::Length len = 0;
                                                NativeCallbackStream streambuf(_callback);
                                                std::ostream stream(&streambuf);
                                                block.serialize(stream, len);
                                                stream << std::flush;
                                        }

                                        _callback.endBlock();
                                }
                        }
                        _callback.endBundle();
                        return (*this);
                }
        } /* namespace api */
} /* namespace dtn */