blob: c839666b74b75092f22381a20a981cf29ae17f94 [file] [log] [blame]
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
* Copyright (c) 2013-2015 Regents of the University of California.
*
* This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
*
* ndn-cxx library is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later version.
*
* ndn-cxx library 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 Lesser General Public License for more details.
*
* You should have received copies of the GNU General Public License and GNU Lesser
* General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see
* <http://www.gnu.org/licenses/>.
*
* See AUTHORS.md for complete list of ndn-cxx authors and contributors.
*/
#include "packet.hpp"
#include "detail/field-info.hpp"
#include <boost/range/adaptor/reversed.hpp>
namespace ndn {
namespace lp {
Packet::Packet()
: m_wire(Block(tlv::LpPacket))
{
}
Packet::Packet(const Block& wire)
{
wireDecode(wire);
}
template<encoding::Tag TAG>
size_t
Packet::wireEncode(EncodingImpl<TAG>& encoder) const
{
if (m_wire.hasWire()) {
return m_wire.size();
}
size_t length = 0;
for (const Block& element : boost::adaptors::reverse(m_wire.elements())) {
length += encoder.prependBlock(element);
}
length += encoder.prependVarNumber(length);
length += encoder.prependVarNumber(tlv::LpPacket);
return length;
}
template size_t
Packet::wireEncode<encoding::EncoderTag>(EncodingImpl<encoding::EncoderTag>& encoder) const;
template size_t
Packet::wireEncode<encoding::EstimatorTag>(EncodingImpl<encoding::EstimatorTag>& encoder) const;
const Block
Packet::wireEncode() const
{
if (m_wire.hasWire()) {
return m_wire;
}
// If no header or trailer, return bare network packet
Block::element_container elements = m_wire.elements();
if (elements.size() == 1 && elements.front().type() == FragmentField::TlvType::value) {
elements.front().parse();
elements.front().elements().front().parse();
return elements.front().elements().front();
}
EncodingEstimator estimator;
size_t estimatedSize = wireEncode(estimator);
EncodingBuffer buffer(estimatedSize, 0);
wireEncode(buffer);
m_wire = buffer.block();
return m_wire;
}
void
Packet::wireDecode(const Block& wire)
{
if (wire.type() == ndn::tlv::Interest || wire.type() == ndn::tlv::Data) {
m_wire = Block(tlv::LpPacket);
add<FragmentField>(make_pair(wire.begin(), wire.end()));
return;
}
if (wire.type() != tlv::LpPacket) {
BOOST_THROW_EXCEPTION(Error("unrecognized TLV-TYPE " + to_string(wire.type())));
}
wire.parse();
bool isFirst = true;
detail::FieldInfo prev;
for (const Block& element : wire.elements()) {
detail::FieldInfo info(element.type());
if (!info.isRecognized && !info.canIgnore) {
BOOST_THROW_EXCEPTION(Error("unrecognized field cannot be ignored"));
}
if (!isFirst) {
if (info.tlvType == prev.tlvType && !info.isRepeatable) {
BOOST_THROW_EXCEPTION(Error("non-repeatable field cannot be repeated"));
}
else if (info.tlvType != prev.tlvType && !detail::compareFieldSortOrder(prev, info)) {
BOOST_THROW_EXCEPTION(Error("fields are not in correct sort order"));
}
}
isFirst = false;
prev = info;
}
m_wire = wire;
}
bool
Packet::comparePos(const Block& first, const uint64_t second)
{
detail::FieldInfo firstInfo(first.type());
detail::FieldInfo secondInfo(second);
return detail::compareFieldSortOrder(firstInfo, secondInfo);
}
} // namespace lp
} // namespace ndn