blob: 9f3157c88879358c14d37f8139932a01bbf4a0be [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.
*
* @author Eric Newberry <enewberry@email.arizona.edu>
*/
#include "nack-header.hpp"
namespace ndn {
namespace lp {
std::ostream&
operator<<(std::ostream& os, NackReason reason)
{
switch (reason) {
case NackReason::CONGESTION:
os << "Congestion";
break;
case NackReason::DUPLICATE:
os << "Duplicate";
break;
case NackReason::NO_ROUTE:
os << "NoRoute";
break;
default:
os << "None";
break;
}
return os;
}
NackHeader::NackHeader()
: m_reason(NackReason::NONE)
{
}
NackHeader::NackHeader(const Block& block)
{
wireDecode(block);
}
template<encoding::Tag TAG>
size_t
NackHeader::wireEncode(EncodingImpl<TAG>& encoder) const
{
size_t length = 0;
length += prependNonNegativeIntegerBlock(encoder, tlv::NackReason,
static_cast<uint32_t>(m_reason));
length += encoder.prependVarNumber(length);
length += encoder.prependVarNumber(tlv::Nack);
return length;
}
template size_t
NackHeader::wireEncode<encoding::EncoderTag>(EncodingImpl<encoding::EncoderTag>& encoder) const;
template size_t
NackHeader::wireEncode<encoding::EstimatorTag>(EncodingImpl<encoding::EstimatorTag>& encoder) const;
const Block&
NackHeader::wireEncode() const
{
if (m_wire.hasWire()) {
return m_wire;
}
EncodingEstimator estimator;
size_t estimatedSize = wireEncode(estimator);
EncodingBuffer buffer(estimatedSize, 0);
wireEncode(buffer);
m_wire = buffer.block();
return m_wire;
}
void
NackHeader::wireDecode(const Block& wire)
{
if (wire.type() != tlv::Nack) {
BOOST_THROW_EXCEPTION(ndn::tlv::Error("expecting Nack block"));
}
m_wire = wire;
m_wire.parse();
m_reason = NackReason::NONE;
if (m_wire.elements_size() > 0) {
Block::element_const_iterator it = m_wire.elements_begin();
if (it->type() == tlv::NackReason) {
m_reason = static_cast<NackReason>(readNonNegativeInteger(*it));
}
else {
BOOST_THROW_EXCEPTION(ndn::tlv::Error("expecting NackReason block"));
}
}
}
NackReason
NackHeader::getReason() const
{
switch (m_reason) {
case NackReason::CONGESTION:
case NackReason::DUPLICATE:
case NackReason::NO_ROUTE:
return m_reason;
default:
return NackReason::NONE;
}
}
NackHeader&
NackHeader::setReason(NackReason reason)
{
m_reason = reason;
m_wire.reset();
return *this;
}
} // namespace lp
} // namespace ndn