Add even more of the source
This should be about everything needed to build so far?
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153
APIModules/QTSSReflectorModule/SequenceNumberMap.cpp
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153
APIModules/QTSSReflectorModule/SequenceNumberMap.cpp
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/*
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*
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* @APPLE_LICENSE_HEADER_START@
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*
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* Copyright (c) 1999-2008 Apple Inc. All Rights Reserved.
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this
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* file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_LICENSE_HEADER_END@
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*
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*/
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/*
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File: SequenceNumberMap.cpp
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Contains: Implements object defined in SequenceNumberMap.h.
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*/
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#include <string.h>
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#include "MyAssert.h"
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#include "OSMemory.h"
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#include "SequenceNumberMap.h"
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SequenceNumberMap::SequenceNumberMap(UInt32 inSlidingWindowSize)
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: fSlidingWindow(NULL),
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fWindowSize( (SInt32) inSlidingWindowSize),
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fNegativeWindowSize( (SInt32) inSlidingWindowSize - (SInt32) (2 * inSlidingWindowSize)),
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fHighestSeqIndex(0),
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fHighestSeqNumber(0)
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{
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Assert(fNegativeWindowSize < 0);
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Assert(fWindowSize < 32768);//AddSequenceNumber makes this assumption
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}
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Bool16 SequenceNumberMap::AddSequenceNumber(UInt16 inSeqNumber)
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{
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// Returns whether sequence number has already been added.
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//Check to see if object has been initialized
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if (fSlidingWindow == NULL)
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{
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fSlidingWindow = NEW Bool16[fWindowSize + 1];
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::memset(fSlidingWindow, 0, fWindowSize * sizeof(Bool16));
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fHighestSeqIndex = 0;
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fHighestSeqNumber = inSeqNumber;
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}
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// First check to see if this sequence number is so far below the highest sequence number
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// we can't even put it in the sliding window.
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SInt16 theWindowOffset = inSeqNumber - fHighestSeqNumber;
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if (theWindowOffset < fNegativeWindowSize)
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return false;//We don't know, but for safety, assume we haven't seen it.
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// If this seq # is higher thn the highest previous, set the highest to be this
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// new sequence number, and zero out our sliding window as we go.
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while (theWindowOffset > 0)
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{
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fHighestSeqNumber++;
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fHighestSeqIndex++;
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if (fHighestSeqIndex == fWindowSize)
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fHighestSeqIndex = 0;
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fSlidingWindow[fHighestSeqIndex] = false;
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theWindowOffset--;
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}
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// Find the right entry in the sliding window for this sequence number, taking
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// into account that we may need to wrap.
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SInt32 theWindowIndex = fHighestSeqIndex + theWindowOffset;
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if (theWindowIndex < 0)
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theWindowIndex += fWindowSize;
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Assert(theWindowIndex >= 0);
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Assert(theWindowIndex < fWindowSize);
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// Turn this index on, return whether it was already turned on.
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Bool16 alreadyAdded = fSlidingWindow[theWindowIndex];
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fSlidingWindow[theWindowIndex] = true;
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#if SEQUENCENUMBERMAPTESTING
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//if (alreadyAdded)
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// qtss_printf("Found a duplicate seq num. Num = %d\n", inSeqNumber);
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#endif
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return alreadyAdded;
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}
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#if SEQUENCENUMBERMAPTESTING
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void SequenceNumberMap::Test()
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{
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SequenceNumberMap theMap1;
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Bool16 retval = theMap1.AddSequenceNumber(64674);
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Assert(retval == false);
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retval = theMap1.AddSequenceNumber(64582);
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Assert(retval == false);
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retval = theMap1.AddSequenceNumber(64777);
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Assert(retval == false);
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retval = theMap1.AddSequenceNumber(64582);
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Assert(retval == TRUE);
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retval = theMap1.AddSequenceNumber(64674);
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Assert(retval == TRUE);
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retval = theMap1.AddSequenceNumber(1);
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Assert(retval == FALSE);
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retval = theMap1.AddSequenceNumber(65500);
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Assert(retval == FALSE);
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retval = theMap1.AddSequenceNumber(65500);
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Assert(retval == FALSE);
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retval = theMap1.AddSequenceNumber(32768);
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Assert(retval == FALSE);
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retval = theMap1.AddSequenceNumber(1024);
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Assert(retval == FALSE);
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retval = theMap1.AddSequenceNumber(32757);
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Assert(retval == FALSE);
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retval = theMap1.AddSequenceNumber(32799);
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Assert(retval == FALSE);
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retval = theMap1.AddSequenceNumber(32768);
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Assert(retval == FALSE);
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}
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#endif
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