blob: a4f9938113df0eb28ce14d7c2f476963540f629d [file] [log] [blame]
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
* Copyright (c) 2013-2014 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 "meta-info.hpp"
#include "encoding/block-helpers.hpp"
#include "encoding/encoding-buffer.hpp"
#include "util/concepts.hpp"
namespace ndn {
BOOST_CONCEPT_ASSERT((boost::EqualityComparable<MetaInfo>));
BOOST_CONCEPT_ASSERT((WireEncodable<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(-1)
{
}
MetaInfo::MetaInfo(const Block& block)
{
wireDecode(block);
}
MetaInfo&
MetaInfo::setType(uint32_t type)
{
m_wire.reset();
m_type = type;
return *this;
}
MetaInfo&
MetaInfo::setFreshnessPeriod(const time::milliseconds& freshnessPeriod)
{
m_wire.reset();
m_freshnessPeriod = freshnessPeriod;
return *this;
}
MetaInfo&
MetaInfo::setFinalBlockId(const name::Component& finalBlockId)
{
m_wire.reset();
m_finalBlockId = finalBlockId;
return *this;
}
const std::list<Block>&
MetaInfo::getAppMetaInfo() const
{
return m_appMetaInfo;
}
MetaInfo&
MetaInfo::setAppMetaInfo(const std::list<Block>& info)
{
for (std::list<Block>::const_iterator i = info.begin(); i != info.end(); ++i) {
if (!(128 <= i->type() && i->type() <= 252))
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))
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 (std::list<Block>::iterator iter = m_appMetaInfo.begin();
iter != m_appMetaInfo.end(); ++iter) {
if (iter->type() == tlvType) {
m_wire.reset();
m_appMetaInfo.erase(iter);
return true;
}
}
return false;
}
const Block*
MetaInfo::findAppMetaInfo(uint32_t tlvType) const
{
for (std::list<Block>::const_iterator iter = m_appMetaInfo.begin();
iter != m_appMetaInfo.end(); ++iter) {
if (iter->type() == tlvType) {
return &*iter;
}
}
return 0;
}
template<bool T>
size_t
MetaInfo::wireEncode(EncodingImpl<T>& blk) const
{
// MetaInfo ::= META-INFO-TYPE TLV-LENGTH
// ContentType?
// FreshnessPeriod?
// FinalBlockId?
// AppMetaInfo*
size_t totalLength = 0;
for (std::list<Block>::const_reverse_iterator appMetaInfoItem = m_appMetaInfo.rbegin();
appMetaInfoItem != m_appMetaInfo.rend(); ++appMetaInfoItem) {
totalLength += prependBlock(blk, *appMetaInfoItem);
}
// FinalBlockId
if (!m_finalBlockId.empty())
{
totalLength += prependNestedBlock(blk, tlv::FinalBlockId, m_finalBlockId);
}
// FreshnessPeriod
if (m_freshnessPeriod >= time::milliseconds::zero())
{
totalLength += prependNonNegativeIntegerBlock(blk, tlv::FreshnessPeriod,
m_freshnessPeriod.count());
}
// ContentType
if (m_type != tlv::ContentType_Blob)
{
totalLength += prependNonNegativeIntegerBlock(blk, tlv::ContentType, m_type);
}
totalLength += blk.prependVarNumber(totalLength);
totalLength += blk.prependVarNumber(tlv::MetaInfo);
return totalLength;
}
template size_t
MetaInfo::wireEncode<true>(EncodingImpl<true>& block) const;
template size_t
MetaInfo::wireEncode<false>(EncodingImpl<false>& block) const;
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*
Block::element_const_iterator val = m_wire.elements_begin();
// ContentType
if (val != m_wire.elements_end() && val->type() == tlv::ContentType) {
m_type = readNonNegativeInteger(*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 = time::milliseconds::min();
}
// FinalBlockId
if (val != m_wire.elements_end() && val->type() == tlv::FinalBlockId) {
m_finalBlockId = val->blockFromValue();
if (m_finalBlockId.type() != tlv::NameComponent)
{
/// @todo May or may not throw exception later...
m_finalBlockId.reset();
}
++val;
}
else {
m_finalBlockId.reset();
}
// 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() >= time::milliseconds::zero()) {
os << ", FreshnessPeriod: " << info.getFreshnessPeriod();
}
// FinalBlockId
if (!info.getFinalBlockId().empty()) {
os << ", FinalBlockId: ";
info.getFinalBlockId().toUri(os);
}
// App-defined MetaInfo items
for (std::list<Block>::const_iterator iter = info.getAppMetaInfo().begin();
iter != info.getAppMetaInfo().end(); ++iter) {
os << ", AppMetaInfoTlvType: " << iter->type();
}
return os;
}
} // namespace ndn