[ndnSIM] Adding new field to Interest packet

[Mateus Sousa]

Hi all,

I added a new field to Interest packet by following the discussions:
http://www.lists.cs.ucla.edu/pipermail/ndnsim/2015-July/002044.html and
http://www.lists.cs.ucla.edu/pipermail/ndnsim/2017-March/003481.html.

I created the field "NextForwarder" to point what node is the next
forwarder to the interest. This field should be updated at every node (here
is the problem).

However, the alterations aren't persistent. The field value turns into "0"
no matter what value I set.

Here goes my modifications:

*    src/Interest.cpp: *

    Interest&
    Interest::setNextForwarder(uint32_t next) {
           if (m_wire.hasWire() && m_nextForwarder.value_size() ==
sizeof(uint32_t)) {
            std::memcpy(const_cast<uint8_t*>(m_nextForwarder.value()),
&next, sizeof(next));
  }
  else {
    m_nextForwarder = makeBinaryBlock(tlv::NextForwarder,
                              reinterpret_cast<const uint8_t*>(&next),
                              sizeof(next));
    m_wire.reset();
  }
  return *this;
}

uint32_t
Interest::getNextForwarder() const{
  if (!m_nextForwarder.hasWire())
    const_cast<Interest*>(this)->setNextForwarder(9999);

  if (m_nextForwarder.value_size() == sizeof(uint32_t))
    return *reinterpret_cast<const uint32_t*>(m_nextForwarder.value());
  else {
    return readNonNegativeInteger(m_nextForwarder);
  }
}


*    encoding/tlv.h*
          NextForwarder = 33, // X- Mateus


Thanks in advance.
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