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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
* Copyright (c) 2013-2019 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 "ndn-cxx/meta-info.hpp"
#include "ndn-cxx/encoding/block-helpers.hpp"
#include "ndn-cxx/encoding/encoding-buffer.hpp"
namespace ndn {
BOOST_CONCEPT_ASSERT((WireEncodable<MetaInfo>));
BOOST_CONCEPT_ASSERT((WireEncodableWithEncodingBuffer<MetaInfo>));
BOOST_CONCEPT_ASSERT((WireDecodable<MetaInfo>));
static_assert(std::is_base_of<tlv::Error, MetaInfo::Error>::value,
"MetaInfo::Error must inherit from tlv::Error");
MetaInfo::MetaInfo()
: m_type(tlv::ContentType_Blob)
, m_freshnessPeriod(DEFAULT_FRESHNESS_PERIOD)
{
}
MetaInfo::MetaInfo(const Block& block)
{
wireDecode(block);
}
MetaInfo&
MetaInfo::setType(uint32_t type)
{
m_wire.reset();
m_type = type;
return *this;
}
MetaInfo&
MetaInfo::setFreshnessPeriod(time::milliseconds freshnessPeriod)
{
if (freshnessPeriod < time::milliseconds::zero()) {
NDN_THROW(std::invalid_argument("FreshnessPeriod must be >= 0"));
}
m_wire.reset();
m_freshnessPeriod = freshnessPeriod;
return *this;
}
MetaInfo&
MetaInfo::setFinalBlock(optional<name::Component> finalBlockId)
{
m_wire.reset();
m_finalBlockId = std::move(finalBlockId);
return *this;
}
const std::list<Block>&
MetaInfo::getAppMetaInfo() const
{
return m_appMetaInfo;
}
MetaInfo&
MetaInfo::setAppMetaInfo(const std::list<Block>& info)
{
for (const auto& block : info) {
if (block.type() < 128 || block.type() > 252)
NDN_THROW(Error("AppMetaInfo block has type outside the application range [128, 252]"));
}
m_wire.reset();
m_appMetaInfo = info;
return *this;
}
MetaInfo&
MetaInfo::addAppMetaInfo(const Block& block)
{
if (!(128 <= block.type() && block.type() <= 252))
NDN_THROW(Error("AppMetaInfo block has type outside the application range [128, 252]"));
m_wire.reset();
m_appMetaInfo.push_back(block);
return *this;
}
bool
MetaInfo::removeAppMetaInfo(uint32_t tlvType)
{
for (auto it = m_appMetaInfo.begin(); it != m_appMetaInfo.end(); ++it) {
if (it->type() == tlvType) {
m_wire.reset();
m_appMetaInfo.erase(it);
return true;
}
}
return false;
}
const Block*
MetaInfo::findAppMetaInfo(uint32_t tlvType) const
{
auto it = std::find_if(m_appMetaInfo.begin(), m_appMetaInfo.end(),
[=] (const Block& b) { return b.type() == tlvType; });
return it != m_appMetaInfo.end() ? &*it : nullptr;
}
template<encoding::Tag TAG>
size_t
MetaInfo::wireEncode(EncodingImpl<TAG>& encoder) const
{
// MetaInfo ::= META-INFO-TYPE TLV-LENGTH
// ContentType?
// FreshnessPeriod?
// FinalBlockId?
// AppMetaInfo*
size_t totalLength = 0;
for (auto it = m_appMetaInfo.rbegin(); it != m_appMetaInfo.rend(); ++it) {
totalLength += encoder.prependBlock(*it);
}
// FinalBlockId
if (m_finalBlockId) {
totalLength += prependNestedBlock(encoder, tlv::FinalBlockId, *m_finalBlockId);
}
// FreshnessPeriod
if (m_freshnessPeriod != DEFAULT_FRESHNESS_PERIOD) {
totalLength += prependNonNegativeIntegerBlock(encoder, tlv::FreshnessPeriod,
static_cast<uint64_t>(m_freshnessPeriod.count()));
}
// ContentType
if (m_type != tlv::ContentType_Blob) {
totalLength += prependNonNegativeIntegerBlock(encoder, tlv::ContentType, m_type);
}
totalLength += encoder.prependVarNumber(totalLength);
totalLength += encoder.prependVarNumber(tlv::MetaInfo);
return totalLength;
}
NDN_CXX_DEFINE_WIRE_ENCODE_INSTANTIATIONS(MetaInfo);
const Block&
MetaInfo::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
MetaInfo::wireDecode(const Block& wire)
{
m_wire = wire;
m_wire.parse();
// MetaInfo ::= META-INFO-TYPE TLV-LENGTH
// ContentType?
// FreshnessPeriod?
// FinalBlockId?
// AppMetaInfo*
auto val = m_wire.elements_begin();
// ContentType
if (val != m_wire.elements_end() && val->type() == tlv::ContentType) {
m_type = readNonNegativeIntegerAs<uint32_t>(*val);
++val;
}
else {
m_type = tlv::ContentType_Blob;
}
// FreshnessPeriod
if (val != m_wire.elements_end() && val->type() == tlv::FreshnessPeriod) {
m_freshnessPeriod = time::milliseconds(readNonNegativeInteger(*val));
++val;
}
else {
m_freshnessPeriod = DEFAULT_FRESHNESS_PERIOD;
}
// FinalBlockId
if (val != m_wire.elements_end() && val->type() == tlv::FinalBlockId) {
m_finalBlockId.emplace(val->blockFromValue());
++val;
}
else {
m_finalBlockId = nullopt;
}
// AppMetaInfo (if any)
for (; val != m_wire.elements().end(); ++val) {
m_appMetaInfo.push_back(*val);
}
}
std::ostream&
operator<<(std::ostream& os, const MetaInfo& info)
{
// ContentType
os << "ContentType: " << info.getType();
// FreshnessPeriod
if (info.getFreshnessPeriod() > 0_ms) {
os << ", FreshnessPeriod: " << info.getFreshnessPeriod();
}
// FinalBlockId
if (info.getFinalBlock()) {
os << ", FinalBlockId: ";
info.getFinalBlock()->toUri(os);
}
// App-defined MetaInfo items
for (const auto& block : info.getAppMetaInfo()) {
os << ", AppMetaInfoTlvType: " << block.type();
}
return os;
}
} // namespace ndn