helper: Add LFID route calculation
Loop-Free In-port Dependent (LFID) route calculation provides a set of loop-free paths.
Basically porting the existing code from https://github.com/schneiderklaus/ndnSIM-routing
Refs: #4985
Change-Id: I1ab25e729851cf2233c3b99be715ba0159cca0c7
diff --git a/helper/lfid/remove-loops.hpp b/helper/lfid/remove-loops.hpp
new file mode 100644
index 0000000..ec2a89e
--- /dev/null
+++ b/helper/lfid/remove-loops.hpp
@@ -0,0 +1,49 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2019 Klaus Schneider, The University of Arizona
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Author: Klaus Schneider <klaus@cs.arizona.edu>
+ */
+
+#ifndef LFID_REMOVE_LOOPS_H
+#define LFID_REMOVE_LOOPS_H
+
+#include <boost/graph/adjacency_list.hpp>
+
+#include "ns3/ndnSIM/helper/lfid/abstract-fib.hpp"
+
+namespace ns3 {
+namespace ndn {
+
+// No Vertex Property
+// Edge Property: Weight.
+using DiGraph =
+ boost::adjacency_list<boost::listS, boost::vecS, boost::bidirectionalS, boost::no_property,
+ boost::property<boost::edge_weight_t, int>>;
+
+void
+getDigraphFromFib(DiGraph& dg, const AbstractFib::AllNodeFib& allNodeFIB, const int dstId);
+
+int
+removeLoops(AbstractFib::AllNodeFib& allNodeFIB, bool printOutput = true);
+
+int
+removeDeadEnds(AbstractFib::AllNodeFib& allNodeFIB, bool printOutput = true);
+
+} // namespace ndn
+} // namespace ns3
+
+#endif //LFID_REMOVE_LOOPS_H