--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/internet-node/udp-header.cc	Fri May 04 15:04:07 2007 +0200
@@ -0,0 +1,149 @@
+/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2005 INRIA
+ * All rights reserved.
+ *
+ * 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: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
+ */
+
+#include "udp-header.h"
+#include "ipv4-checksum.h"
+
+namespace ns3 {
+
+bool UdpHeader::m_calcChecksum = false;
+
+/* The magic values below are used only for debugging.
+ * They can be used to easily detect memory corruption
+ * problems so you can see the patterns in memory.
+ */
+UdpHeader::UdpHeader ()
+  : m_sourcePort (0xfffd),
+    m_destinationPort (0xfffd),
+    m_payloadSize (0xfffd),
+    m_initialChecksum (0)
+{}
+UdpHeader::~UdpHeader ()
+{
+  m_sourcePort = 0xfffe;
+  m_destinationPort = 0xfffe;
+  m_payloadSize = 0xfffe;
+}
+
+void 
+UdpHeader::EnableChecksums (void)
+{
+  m_calcChecksum = true;
+}
+
+void 
+UdpHeader::SetDestination (uint16_t port)
+{
+  m_destinationPort = port;
+}
+void 
+UdpHeader::SetSource (uint16_t port)
+{
+  m_sourcePort = port;
+}
+uint16_t 
+UdpHeader::GetSource (void) const
+{
+  return m_sourcePort;
+}
+uint16_t 
+UdpHeader::GetDestination (void) const
+{
+  return m_destinationPort;
+}
+void 
+UdpHeader::SetPayloadSize (uint16_t size)
+{
+  m_payloadSize = size;
+}
+void 
+UdpHeader::InitializeChecksum (Ipv4Address source, 
+                              Ipv4Address destination,
+                              uint8_t protocol)
+{
+  uint8_t buf[12];
+  source.Serialize (buf);
+  destination.Serialize (buf+4);
+  buf[8] = 0;
+  buf[9] = protocol;
+  uint16_t udpLength = m_payloadSize + GetSize ();
+  buf[10] = udpLength >> 8;
+  buf[11] = udpLength & 0xff;
+
+  m_initialChecksum = Ipv4ChecksumCalculate (0, buf, 12);
+}
+
+
+
+void 
+UdpHeader::PrintTo (std::ostream &os) const
+{
+  os << "(udp)"
+     << ", port source=" << m_sourcePort
+     << ", port destination=" << m_destinationPort
+     << ", length=" << m_payloadSize;
+}
+
+uint32_t 
+UdpHeader::GetSerializedSize (void) const
+{
+  return 8;
+}
+
+void
+UdpHeader::SerializeTo (Buffer::Iterator start) const
+{
+  Buffer::Iterator i = start;
+  i.WriteHtonU16 (m_sourcePort);
+  i.WriteHtonU16 (m_destinationPort);
+  i.WriteHtonU16 (m_payloadSize + GetSize ());
+  i.WriteU16 (0);
+
+  if (m_calcChecksum) 
+    {
+#if 0
+      //XXXX
+      uint16_t checksum = Ipv4ChecksumCalculate (m_initialChecksum, 
+                                                  buffer->PeekData (), 
+                                                  GetSize () + m_payloadSize);
+      checksum = Ipv4ChecksumComplete (checksum);
+      i = buffer->Begin ();
+      i.Next (6);
+      i.WriteU16 (checksum);
+#endif
+    }
+}
+uint32_t
+UdpHeader::DeserializeFrom (Buffer::Iterator start)
+{
+  Buffer::Iterator i = start;
+  m_sourcePort = i.ReadNtohU16 ();
+  m_destinationPort = i.ReadNtohU16 ();
+  m_payloadSize = i.ReadNtohU16 () - GetSize ();
+  if (m_calcChecksum) 
+    {
+      // XXX verify checksum.
+    }
+  return GetSerializedSize ();
+}
+
+
+}; // namespace ns3