Junxiao Shi
df3b438c40
FragIndex and FragCount fields are encoded as nonNegativeInteger. refs #1283 Change-Id: I4654078c3bfd73c83ce06ce6a9cd97952a4f49f8
75 lines
2.3 KiB
C++
75 lines
2.3 KiB
C++
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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/**
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* Copyright (C) 2014 Named Data Networking Project
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* See COPYING for copyright and distribution information.
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*/
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#include "ndnlp-parse.hpp"
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namespace nfd {
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namespace ndnlp {
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void
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NdnlpData::wireDecode(const Block& wire)
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{
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if (wire.type() != tlv::NdnlpData) {
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throw ParseError("top element is not NdnlpData");
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}
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wire.parse();
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const Block::element_container& elements = wire.elements();
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if (elements.size() < 2) {
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throw ParseError("NdnlpData element has incorrect number of children");
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}
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const Block& sequenceElement = elements.front();
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if (sequenceElement.type() != tlv::NdnlpSequence) {
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throw ParseError("NdnlpSequence element is missing");
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}
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if (sequenceElement.value_size() != sizeof(uint64_t)) {
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throw ParseError("NdnlpSequence element has incorrect length");
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}
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m_seq = be64toh(*reinterpret_cast<const uint64_t*>(&*sequenceElement.value_begin()));
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const Block& payloadElement = elements.back();
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if (payloadElement.type() != tlv::NdnlpPayload) {
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throw ParseError("NdnlpPayload element is missing");
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}
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m_payload = payloadElement;
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if (elements.size() == 2) { // single wire packet
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m_fragIndex = 0;
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m_fragCount = 1;
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return;
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}
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if (elements.size() != 4) {
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throw ParseError("NdnlpData element has incorrect number of children");
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}
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const Block& fragIndexElement = elements.at(1);
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if (fragIndexElement.type() != tlv::NdnlpFragIndex) {
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throw ParseError("NdnlpFragIndex element is missing");
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}
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uint64_t fragIndex = ndn::readNonNegativeInteger(fragIndexElement);
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if (fragIndex > std::numeric_limits<uint16_t>::max()) {
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throw ParseError("NdnlpFragIndex is too large");
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}
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m_fragIndex = static_cast<uint16_t>(fragIndex);
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const Block& fragCountElement = elements.at(2);
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if (fragCountElement.type() != tlv::NdnlpFragCount) {
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throw ParseError("NdnlpFragCount element is missing");
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}
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uint64_t fragCount = ndn::readNonNegativeInteger(fragCountElement);
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if (fragCount > std::numeric_limits<uint16_t>::max()) {
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throw ParseError("NdnlpFragCount is too large");
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}
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m_fragCount = static_cast<uint16_t>(fragCount);
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if (m_fragIndex >= m_fragCount) {
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throw ParseError("NdnlpFragIndex must be less than NdnlpFragCount");
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}
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}
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} // namespace ndnlp
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} // namespace nfd
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