model: PacketHeader<T> and interface with NS-3
This commit creates a compatible interface to convert ndn-cxx Interest
and Data structures into NS-3's Ptr<Packet> and back.
Refs: #2048, #2230
diff --git a/model/ndn-ns3.cpp b/model/ndn-ns3.cpp
new file mode 100644
index 0000000..c7d6c29
--- /dev/null
+++ b/model/ndn-ns3.cpp
@@ -0,0 +1,95 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2011-2014 Regents of the University of California.
+ *
+ * This file is part of ndnSIM. See AUTHORS for complete list of ndnSIM authors and
+ * contributors.
+ *
+ * ndnSIM is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU General Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later version.
+ *
+ * ndnSIM 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * ndnSIM, e.g., in COPYING.md file. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+#include "ndn-ns3.hpp"
+
+#include <ndn-cxx/encoding/block.hpp>
+#include <ndn-cxx/interest.hpp>
+#include <ndn-cxx/data.hpp>
+
+#include "ndn-header.hpp"
+#include "../utils/ndn-ns3-packet-tag.hpp"
+
+namespace ns3 {
+namespace ndn {
+
+template<class T>
+std::shared_ptr<const T>
+Convert::FromPacket(Ptr<Packet> packet)
+{
+ PacketHeader<T> header;
+ packet->RemoveHeader(header);
+
+ auto pkt = header.getPacket();
+ pkt->setTag(make_shared<Ns3PacketTag>(packet));
+
+ return pkt;
+}
+
+template std::shared_ptr<const Interest>
+Convert::FromPacket<Interest>(Ptr<Packet> packet);
+
+template std::shared_ptr<const Data>
+Convert::FromPacket<Data>(Ptr<Packet> packet);
+
+template<class T>
+Ptr<Packet>
+Convert::ToPacket(const T& pkt)
+{
+ PacketHeader<T> header(pkt);
+
+ Ptr<Packet> packet;
+
+ auto tag = pkt.template getTag<Ns3PacketTag>();
+ if (tag != nullptr) {
+ packet = tag->getPacket()->Copy();
+ }
+ else {
+ packet = Create<Packet>();
+ }
+
+ packet->AddHeader(header);
+ return packet;
+}
+
+template Ptr<Packet>
+Convert::ToPacket<Interest>(const Interest& packet);
+
+template Ptr<Packet>
+Convert::ToPacket<Data>(const Data& packet);
+
+uint32_t
+Convert::getPacketType(Ptr<const Packet> packet)
+{
+ uint8_t type;
+ uint32_t nRead = packet->CopyData(&type, 1);
+ if (nRead != 1) {
+ throw ::ndn::tlv::Error("Unknown header");
+ }
+
+ if (type == ::ndn::tlv::Interest || type == ::ndn::tlv::Data) {
+ return type;
+ }
+ else {
+ throw ::ndn::tlv::Error("Unknown header");
+ }
+}
+
+} // namespace ndn
+} // namespace ns3