tlv-nlsr.hpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
#ifndef NLSR_TLV_NLSR_HPP
#define NLSR_TLV_NLSR_HPP

#include <ndn-cxx/encoding/tlv.hpp>
#include <ndn-cxx/encoding/block-helpers.hpp>

namespace ndn {
namespace tlv {
namespace nlsr {

enum {
  LsaInfo          = 128,
  OriginRouter     = 129,
  SequenceNumber   = 130,
  AdjacencyLsa     = 131,
  Adjacency        = 132,
  CoordinateLsa    = 133,
  Double           = 134,
  HyperbolicRadius = 135,
  HyperbolicAngle  = 136,
  NameLsa          = 137,
  LsdbStatus       = 138,
  ExpirationPeriod = 139,
  Cost             = 140,
  Uri              = 141,
  Destination      = 142,
  NextHop          = 143,
  RoutingTable     = 144,
  RouteTableEntry  = 145
};

inline double
readDouble(const ndn::Block& block)
{
  block.parse();
  auto it = block.elements_begin();

  double doubleFromBlock = 0.0;
  if (it == it->elements_end() || it->type() != ndn::tlv::nlsr::Double ||
      it->value_size() != sizeof(doubleFromBlock)) {
    BOOST_THROW_EXCEPTION(ndn::tlv::Error("Block does not contain a double"));
  }
  memcpy(&doubleFromBlock, it->value(), sizeof(doubleFromBlock));
  return doubleFromBlock;
}

template<ndn::encoding::Tag TAG>
inline size_t
prependDouble(ndn::EncodingImpl<TAG>& encoder, uint32_t type, double value)
{
  size_t totalLength = 0;

  const uint8_t* doubleBytes = reinterpret_cast<const uint8_t*>(&value);
  totalLength = encoder.prependByteArrayBlock(ndn::tlv::nlsr::Double, doubleBytes, 8);
  totalLength += encoder.prependVarNumber(totalLength);
  totalLength += encoder.prependVarNumber(type);

  return totalLength;
}

} // namespace nlsr
} // namespace tlv
} // namespace ndn

#endif // NLSR_TLV_NLSR_HPP