--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/internet-stack/pending-data.cc Mon Jun 09 15:40:22 2008 -0700
@@ -0,0 +1,200 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+//
+// Copyright (c) 2006 Georgia Tech Research Corporation
+//
+// 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: Rajib Bhattacharjea<raj.b@gatech.edu>
+//
+
+
+// This is a port of Data PDU Headers from:
+// Georgia Tech Network Simulator
+// George F. Riley. Georgia Tech, Spring 2002
+
+#include <iostream>
+#include <algorithm>
+
+#include <string.h>
+
+#include "pending-data.h"
+#include "ns3/fatal-error.h"
+namespace ns3
+{
+
+PendingData::PendingData () : size (0), data (0),
+ msgSize (0), responseSize (0)
+{
+}
+
+PendingData::PendingData (uint32_t s, uint8_t* d, uint32_t msg, uint32_t resp)
+ : size (s), data (0), msgSize (msg), responseSize (resp)
+{
+ if (d)
+ {
+ data.push_back (Create<Packet> (d, size));
+ }
+}
+
+PendingData::PendingData(const std::string& s)
+ : size (s.length () + 1), data (0),
+ msgSize (0), responseSize (0)
+{
+ data.push_back (Create<Packet> ((uint8_t*)s.c_str(), size));
+}
+
+PendingData::PendingData(const PendingData& c)
+ : size (c.Size ()), data (c.data),
+ msgSize (c.msgSize), responseSize (c.responseSize)
+{
+}
+
+PendingData::~PendingData()
+{
+}
+
+PendingData* PendingData::Copy () const
+{
+ return new PendingData (*this);
+};
+
+PendingData* PendingData::CopyS (uint32_t s)
+{ // Copy, but with new size (assumes no associated data);
+ return new PendingData (s, 0, msgSize, responseSize);
+}
+
+PendingData* PendingData::CopySD (uint32_t s, uint8_t* d)
+{ // Copy, but with new size (assumes no associated data);
+ return new PendingData (s, d, msgSize, responseSize);
+}
+
+void PendingData::Clear ()
+{ // Remove all pending data
+ data.clear();
+ size = 0;
+}
+
+void PendingData::Add (uint32_t s, const uint8_t* d)
+{
+ if (d == 0)
+ {
+ data.push_back(Create<Packet> (d,s));
+ }
+ else
+ {
+ data.push_back(Create<Packet> (s));
+ }
+ size += s;
+}
+
+void PendingData::Add (Ptr<Packet> p)
+{
+ data.push_back(p);
+ size += p->GetSize();
+}
+
+uint32_t PendingData::SizeFromSeq (const SequenceNumber& f, const SequenceNumber& o)
+{
+ uint32_t o1 = OffsetFromSeq (f,o); // Offset to start of unused data
+ return SizeFromOffset (o1); // Amount of data after offset
+}
+
+uint32_t PendingData::SizeFromOffset (uint32_t o)
+{ // Find out how much data is available from offset
+ if (o > size) return 0; // No data at requested offset
+ return size - o; // Available data after offset
+}
+
+uint32_t PendingData::OffsetFromSeq (const SequenceNumber& f, const SequenceNumber& o)
+{ // f is the first sequence number in this data, o is offset sequence
+ if (o < f)
+ {
+ return 0; // HuH? Shouldn't happen
+ }
+ return o - f;
+}
+
+Ptr<Packet> PendingData::CopyFromOffset (uint32_t s, uint32_t o)
+{ // Make a copy of data from starting position "o" for "s" bytes
+ // Return NULL if results in zero length data
+ uint32_t s1 = std::min (s, SizeFromOffset (o)); // Insure not beyond end of data
+ if (s1 == 0)
+ {
+ return 0; // No data requested
+ }
+ if (data.size() != 0)
+ { // Actual data exists, make copy and return it
+ uint32_t count = 0;
+ std::vector<Ptr<Packet> >::size_type begin = 0;
+ bool beginFound = false;
+ std::vector<Ptr<Packet> >::size_type end = 0;
+ Ptr<Packet> outPacket;
+ Ptr<Packet> endFragment;
+ for (std::vector<Ptr<Packet> >::size_type i=0;i<data.size();++i)
+ {
+ count+=data[i]->GetSize();
+ if (!beginFound)
+ {
+ if (count > o)
+ {
+ if (count >= o + s1) //then just copy within this packet
+ {
+ Ptr<Packet> toFragment = data[i];
+ uint32_t packetStart = count - toFragment->GetSize();
+ uint32_t packetOffset = o - packetStart;
+ outPacket = toFragment->CreateFragment (packetOffset, s1);
+ return outPacket;
+ }
+ begin = i;
+ beginFound = true;
+ Ptr<Packet> toFragment = data[begin];
+ uint32_t packetStart = count - toFragment->GetSize();
+ uint32_t packetOffset = o - packetStart;
+ uint32_t fragmentLength = count - o;
+ outPacket = toFragment->CreateFragment (packetOffset, fragmentLength);
+ }
+ }
+ else
+ {
+ if (count >= o + s1)
+ {
+ end = i;
+ Ptr<Packet> toFragment = data[end];
+ uint32_t packetStart = count - toFragment->GetSize();
+ uint32_t fragmentLength = o + s1 - packetStart;
+ endFragment = toFragment->CreateFragment(0, fragmentLength);
+ break;
+ }
+ }
+ }
+ for (std::vector<Ptr<Packet> >::size_type i=begin+1;i<end;++i)
+ {
+ outPacket->AddAtEnd (data[i]);
+ }
+ outPacket->AddAtEnd(endFragment);
+ NS_ASSERT(outPacket->GetSize() == s1);
+ return outPacket;
+ }
+ else
+ { // No actual data, just return dummy-data packet of correct size
+ return Create<Packet> (s1);
+ }
+}
+
+Ptr<Packet> PendingData::CopyFromSeq (uint32_t s, const SequenceNumber& f, const SequenceNumber& o)
+{
+ return CopyFromOffset (s, OffsetFromSeq(f,o));
+}
+
+}//namepsace ns3