geo-tag.cpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
#include "ndn-cxx/lp/geo-tag.hpp"
#include "ndn-cxx/lp/tlv.hpp"

namespace ndn {
namespace lp {

GeoTag::GeoTag(const Block& block)
{
  wireDecode(block);
}

template<encoding::Tag TAG>
size_t
GeoTag::wireEncode(EncodingImpl<TAG>& encoder) const
{
  size_t length = 0;
  length += prependDoubleBlock(encoder, tlv::GeoTagPos, std::get<2>(m_pos));
  length += prependDoubleBlock(encoder, tlv::GeoTagPos, std::get<1>(m_pos));
  length += prependDoubleBlock(encoder, tlv::GeoTagPos, std::get<0>(m_pos));
  length += encoder.prependVarNumber(length);
  length += encoder.prependVarNumber(tlv::GeoTag);
  return length;
}

template size_t
GeoTag::wireEncode<encoding::EncoderTag>(EncodingImpl<encoding::EncoderTag>& encoder) const;

template size_t
GeoTag::wireEncode<encoding::EstimatorTag>(EncodingImpl<encoding::EstimatorTag>& encoder) const;

const Block&
GeoTag::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
GeoTag::wireDecode(const Block& wire)
{
  if (wire.type() != tlv::GeoTag) {
    NDN_THROW(ndn::tlv::Error("expecting GeoTag block"));
  }

  m_wire = wire;
  m_wire.parse();

  if (m_wire.elements().size() < 3 ||
      m_wire.elements()[0].type() != tlv::GeoTagPos ||
      m_wire.elements()[1].type() != tlv::GeoTagPos ||
      m_wire.elements()[2].type() != tlv::GeoTagPos) {
    NDN_THROW(ndn::tlv::Error("Unexpected input while decoding GeoTag"));
  }
  m_pos = {encoding::readDouble(m_wire.elements()[0]),
           encoding::readDouble(m_wire.elements()[1]),
           encoding::readDouble(m_wire.elements()[2])};
}

} // namespace lp
} // namespace ndn