66 lines
2.3 KiB
C++
66 lines
2.3 KiB
C++
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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//
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// Copyright (c) 2006 Georgia Tech Research Corporation
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License version 2 as
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// published by the Free Software Foundation;
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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// Author: Rajib Bhattacharjea<raj.b@gatech.edu>
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//
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// Ported from:
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// Georgia Tech Network Simulator - Manage 32 bit unsigned sequence numbers
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// George F. Riley. Georgia Tech, Spring 2002
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// Class to manage arithmetic operations on sequence numbers (mod 2^32)
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#include "sequence-number.h"
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bool operator< (const SequenceNumber l, const SequenceNumber r)
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{ // Account for 32 bit rollover
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if (l.seq > 0xc0000000 && r.seq < 0x40000000) return true; // Rollover
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return l.seq < r.seq;
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}
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bool operator<= (const SequenceNumber l, const SequenceNumber r)
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{ // Account for 32 bit rollover
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if (l.seq > 0xc0000000 && r.seq < 0x40000000) return true; // Rollover
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return l.seq <= r.seq;
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}
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bool operator> (const SequenceNumber l, const SequenceNumber r)
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{ // Account for 32 bit rollover
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if (l.seq > 0xc0000000 && r.seq < 0x40000000) return false; // Rollover
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return l.seq > r.seq;
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}
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bool operator>= (const SequenceNumber l, const SequenceNumber r)
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{ // Account for 32 bit rollover
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if (l.seq > 0xc0000000 && r.seq < 0x40000000) return false; // Rollover
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return l.seq >= r.seq;
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}
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// Non-Member Arithmetic operators
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SequenceNumber operator+ (const SequenceNumber l, const SequenceNumber r)
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{
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return SequenceNumber (l.seq + r.seq);
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}
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SequenceNumber operator- (const SequenceNumber l, const SequenceNumber r)
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{ // This assumes l is always bigger than r (allows for rollover)
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if (l.seq >= r.seq) return SequenceNumber (l.seq-r.seq);
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return SequenceNumber ((MAX_SEQ - r.seq) + l.seq + 1); // Adjust for rollover
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}
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