blob: b900450c6b0167af25dc409086896bfae2ede791 [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 "link.hpp"
#include "interest.hpp"
#include "encoding/block-helpers.hpp"
#include "util/crypto.hpp"
#include "security/key-chain.hpp"
#include <algorithm>
#include <boost/range/adaptors.hpp>
namespace ndn {
BOOST_CONCEPT_ASSERT((boost::EqualityComparable<Link>));
BOOST_CONCEPT_ASSERT((WireEncodable<Link>));
BOOST_CONCEPT_ASSERT((WireEncodableWithEncodingBuffer<Link>));
BOOST_CONCEPT_ASSERT((WireDecodable<Link>));
static_assert(std::is_base_of<Data::Error, Link::Error>::value,
"Link::Error should inherit from Data::Error");
Link::Link(const Block& block)
{
wireDecode(block);
}
Link::Link(const Name& name)
: Data(name)
{
}
Link::Link(const Name& name, std::initializer_list<std::pair<uint32_t, Name>> links)
: Data(name)
{
m_delegations.insert(links);
encodeContent();
}
void
Link::addDelegation(uint32_t preference, const Name& name)
{
this->removeDelegationNoEncode(name);
m_delegations.insert({preference, name});
encodeContent();
}
bool
Link::removeDelegation(const Name& name)
{
bool hasRemovedDelegation = this->removeDelegationNoEncode(name);
if (hasRemovedDelegation) {
encodeContent();
}
return hasRemovedDelegation;
}
const Link::DelegationSet&
Link::getDelegations() const
{
return m_delegations;
}
template<encoding::Tag TAG>
size_t
Link::encodeContent(EncodingImpl<TAG>& encoder) const
{
// LinkContent ::= CONTENT-TYPE TLV-LENGTH
// Delegation+
// Delegation ::= LINK-DELEGATION-TYPE TLV-LENGTH
// Preference
// Name
// Preference ::= LINK-PREFERENCE-TYPE TLV-LENGTH
// nonNegativeInteger
size_t totalLength = 0;
for (const auto& delegation : m_delegations | boost::adaptors::reversed) {
size_t delegationLength = 0;
delegationLength += std::get<1>(delegation).wireEncode(encoder);
delegationLength += prependNonNegativeIntegerBlock(encoder, tlv::LinkPreference,
std::get<0>(delegation));
delegationLength += encoder.prependVarNumber(delegationLength);
delegationLength += encoder.prependVarNumber(tlv::LinkDelegation);
totalLength += delegationLength;
}
totalLength += encoder.prependVarNumber(totalLength);
totalLength += encoder.prependVarNumber(tlv::Content);
return totalLength;
}
template size_t
Link::encodeContent<encoding::EncoderTag>(EncodingImpl<encoding::EncoderTag>& encoder) const;
template size_t
Link::encodeContent<encoding::EstimatorTag>(EncodingImpl<encoding::EstimatorTag>& encoder) const;
void
Link::encodeContent()
{
onChanged();
EncodingEstimator estimator;
size_t estimatedSize = encodeContent(estimator);
EncodingBuffer buffer(estimatedSize, 0);
encodeContent(buffer);
setContentType(tlv::ContentType_Link);
setContent(buffer.block());
}
void
Link::decodeContent()
{
// LinkContent ::= CONTENT-TYPE TLV-LENGTH
// Delegation+
// Delegation ::= LINK-DELEGATION-TYPE TLV-LENGTH
// Preference
// Name
// Preference ::= LINK-PREFERENCE-TYPE TLV-LENGTH
// nonNegativeInteger
if (getContentType() != tlv::ContentType_Link)
{
throw Error("Expected Content Type Link");
}
const Block& content = getContent();
content.parse();
for (auto& delegation : content.elements()) {
delegation.parse();
Block::element_const_iterator val = delegation.elements_begin();
if (val == delegation.elements_end()) {
throw Error("Unexpected Link Encoding");
}
uint32_t preference;
try {
preference = static_cast<uint32_t>(readNonNegativeInteger(*val));
}
catch (tlv::Error&) {
throw Error("Missing preference field in Link Encoding");
}
++val;
if (val == delegation.elements_end()) {
throw Error("Missing name field in Link Encoding");
}
Name name(*val);
m_delegations.insert({preference, name});
}
}
void
Link::wireDecode(const Block& wire)
{
Data::wireDecode(wire);
decodeContent();
}
std::tuple<uint32_t, Name>
Link::getDelegationFromWire(const Block& block, size_t index)
{
block.parse();
const Block& contentBlock = block.get(tlv::Content);
contentBlock.parse();
const Block& delegationBlock = contentBlock.elements().at(index);
delegationBlock.parse();
if (delegationBlock.type() != tlv::LinkDelegation) {
throw Error("Unexpected TLV-TYPE; expecting LinkDelegation");
}
return std::make_tuple(
static_cast<uint32_t>(
readNonNegativeInteger(delegationBlock.get(tlv::LinkPreference))),
Name(delegationBlock.get(tlv::Name)));
}
ssize_t
Link::findDelegationFromWire(const Block& block, const Name& delegationName)
{
block.parse();
const Block& contentBlock = block.get(tlv::Content);
contentBlock.parse();
size_t counter = 0;
for (auto&& delegationBlock : contentBlock.elements()) {
delegationBlock.parse();
if (delegationBlock.type() != tlv::LinkDelegation) {
throw Error("Unexpected TLV-TYPE; expecting LinkDelegation");
}
Name name(delegationBlock.get(tlv::Name));
if (name == delegationName) {
return counter;
}
++counter;
}
return INVALID_SELECTED_DELEGATION_INDEX;
}
ssize_t
Link::countDelegationsFromWire(const Block& block)
{
block.parse();
const Block& contentBlock = block.get(tlv::Content);
contentBlock.parse();
return contentBlock.elements_size();
}
bool
Link::removeDelegationNoEncode(const Name& name)
{
bool hasRemoved = false;
auto i = m_delegations.begin();
while (i != m_delegations.end()) {
if (i->second == name) {
hasRemoved = true;
i = m_delegations.erase(i);
}
else {
++i;
}
}
return hasRemoved;
}
} // namespace ndn