face: NDNLPv2 fragmentation and reassembly
refs #3171
Change-Id: If29035b697b904ee49cb86d9248be488657c6f9e
diff --git a/daemon/face/lp-fragmenter.hpp b/daemon/face/lp-fragmenter.hpp
new file mode 100644
index 0000000..8275d0f
--- /dev/null
+++ b/daemon/face/lp-fragmenter.hpp
@@ -0,0 +1,92 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014-2015, Regents of the University of California,
+ * Arizona Board of Regents,
+ * Colorado State University,
+ * University Pierre & Marie Curie, Sorbonne University,
+ * Washington University in St. Louis,
+ * Beijing Institute of Technology,
+ * The University of Memphis.
+ *
+ * This file is part of NFD (Named Data Networking Forwarding Daemon).
+ * See AUTHORS.md for complete list of NFD authors and contributors.
+ *
+ * NFD 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.
+ *
+ * NFD 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
+ * NFD, e.g., in COPYING.md file. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef NFD_DAEMON_FACE_LP_FRAGMENTER_HPP
+#define NFD_DAEMON_FACE_LP_FRAGMENTER_HPP
+
+#include "face-log.hpp"
+
+#include <ndn-cxx/lp/packet.hpp>
+
+namespace nfd {
+namespace face {
+
+class LinkService;
+
+/** \brief fragments network-layer packets into NDNLPv2 link-layer packets
+ * \sa http://redmine.named-data.net/projects/nfd/wiki/NDNLPv2
+ */
+class LpFragmenter
+{
+public:
+ /** \brief Options that control the behavior of LpFragmenter
+ */
+ class Options
+ {
+ public:
+ Options();
+
+ public:
+ /** \brief maximum number of fragments in a packet
+ */
+ size_t nMaxFragments;
+ };
+
+ explicit
+ LpFragmenter(const Options& options = Options(), const LinkService* linkService = nullptr);
+
+ /** \brief set options for fragmenter
+ */
+ void
+ setOptions(const Options& options);
+
+ /** \return LinkService that owns this instance
+ *
+ * This is only used for logging, and may be nullptr.
+ */
+ const LinkService*
+ getLinkService() const;
+
+ /** \brief fragments a network-layer packet into link-layer packets
+ * \param packet an LpPacket that contains a network-layer packet;
+ * must have Fragment field, must not have FragIndex and FragCount fields
+ * \param mtu maximum allowable LpPacket size after fragmentation and sequence number assignment
+ * \return whether fragmentation succeeded, fragmented packets without sequence number
+ */
+ std::tuple<bool, std::vector<lp::Packet>>
+ fragmentPacket(const lp::Packet& packet, size_t mtu);
+
+private:
+ Options m_options;
+ const LinkService* m_linkService;
+};
+
+std::ostream&
+operator<<(std::ostream& os, const FaceLogHelper<LpFragmenter>& flh);
+
+} // namespace face
+} // namespace nfd
+
+#endif // NFD_DAEMON_FACE_LP_FRAGMENTER_HPP