First steps in CCNx packet coding. ccnx_encode* routines rewritten in NS3 style (using NS3::Buffer)
diff --git a/helper/ccnx-header-helper.cc b/helper/ccnx-header-helper.cc
new file mode 100644
index 0000000..fdc986a
--- /dev/null
+++ b/helper/ccnx-header-helper.cc
@@ -0,0 +1,61 @@
+/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2011 University of California, Los Angeles
+ *
+ * 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: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
+#include "ccnx-header-helper.h"
+
+#include "ns3/log.h"
+#include "ns3/packet.h"
+#include "ns3/header.h"
+#include "ns3/object.h"
+
+#include "ns3/ccnx-interest-header.h"
+#include "ns3/ccnx-content-object-header.h"
+
+NS_LOG_COMPONENT_DEFINE ("CcnxHeaderHelper");
+
+#define INTEREST_BYTE0 0x01
+#define INTEREST_BYTE1 0xD2
+
+#define CONTENT_OBJECT_BYTE0 0x04
+#define CONTENT_OBJECT_BYTE1 0x82
+
+namespace ns3
+{
+
+Ptr<Header>
+CcnxHeaderHelper::CreateCorrectCcnxHeader (Ptr<const Packet> packet)
+{
+ uint8_t type[2];
+ uint32_t read=packet->CopyData (type,2);
+ if (read!=2) throw CcnxUnknownHeaderException();
+
+ if (type[0] == INTEREST_BYTE0 && type[1] == INTEREST_BYTE1)
+ {
+ return Create<CcnxInterestHeader> ();
+ }
+ else if (type[0] == CONTENT_OBJECT_BYTE0 && type[1] == CONTENT_OBJECT_BYTE1)
+ {
+ return Create<CcnxContentObjectHeader> ();
+ }
+
+ throw CcnxUnknownHeaderException();
+}
+
+} // namespace ns3