author | hgs |
Mon, 13 Sep 2010 16:12:41 +0530 | |
changeset 61 | 2fc972553898 |
parent 0 | af10295192d8 |
permissions | -rw-r--r-- |
0
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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// Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// sbque.cpp - TCP sequence block queue |
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// |
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|
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#include "sbque.h" |
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|
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EXPORT_C SequenceBlock *SequenceBlockQueue::AddOrdered(TTcpSeqNum aLeft, TTcpSeqNum aRight) |
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{ |
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SequenceBlock *current, *block = NULL; |
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SequenceBlockQueueIter iter(*this); |
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|
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iter.SetToLast(); |
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while (current = iter--, current != NULL) |
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{ |
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// Find correct position. |
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if (aRight < current->iLeft) |
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continue; |
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|
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// No overlap? Insert new block here. |
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if (aLeft > current->iRight) |
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{ |
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if (block = new SequenceBlock(aLeft, aRight), block == NULL) |
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return NULL; |
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block->iLink.Enque(¤t->iLink); |
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iCount++; |
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iBytes += (aRight - aLeft); |
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break; |
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} |
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|
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// Already know about this block? |
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if (aLeft >= current->iLeft && aRight <= current->iRight) |
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{ |
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block = current; |
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break; |
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} |
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|
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// Our block partially overlaps one or more blocks. |
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if (aLeft > current->iLeft) |
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aLeft = current->iLeft; |
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if (aRight < current->iRight) |
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aRight = current->iRight; |
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|
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// Delete the previously known overlapping block. |
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iBytes -= (current->iRight - current->iLeft); |
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current->iLink.Deque(); |
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delete current; |
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iCount--; |
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} |
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|
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// We haven't found or created a sequence block? It goes first then. |
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if (!block) |
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{ |
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block = new SequenceBlock(aLeft, aRight); |
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if (block != NULL) |
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{ |
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AddFirst(*block); |
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iCount++; |
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iBytes += (aRight - aLeft); |
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} |
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} |
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|
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// Return the contiguous block, which the new block is belonged to. |
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return block; |
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} |
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|
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EXPORT_C SequenceBlock *SequenceBlockQueue::AddUnordered(TTcpSeqNum aLeft, TTcpSeqNum aRight) |
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{ |
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SequenceBlock *current, *block = NULL; |
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SequenceBlockQueueIter iter(*this); |
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82 |
|
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while (current = iter++, current != NULL) |
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84 |
{ |
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// Find overlapping blocks. |
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if (aLeft > current->iRight || aRight < current->iLeft) |
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continue; |
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88 |
|
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// Overlapping block exists. Extend our block accordingly. |
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if (aLeft > current->iLeft) |
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aLeft = current->iLeft; |
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if (aRight < current->iRight) |
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aRight = current->iRight; |
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94 |
|
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95 |
// Delete the previously known overlapping block. |
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iBytes -= (current->iRight - current->iLeft); |
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current->iLink.Deque(); |
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delete current; |
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iCount--; |
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100 |
} |
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101 |
|
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102 |
// Insert new block first in the queue. |
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103 |
if (block = new SequenceBlock(aLeft, aRight), block != NULL) |
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104 |
{ |
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105 |
AddFirst(*block); |
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106 |
iOrdered = !iCount; |
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107 |
iCount++; |
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108 |
iBytes += (aRight - aLeft); |
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109 |
} |
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110 |
|
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111 |
// Return the contiguous block, to which the new block belongs. |
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112 |
return block; |
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113 |
} |
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114 |
|
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115 |
|
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116 |
// |
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117 |
// Find a block that contains the given sequence number |
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118 |
// |
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119 |
EXPORT_C SequenceBlock *SequenceBlockQueue::Find(TTcpSeqNum aSeq) |
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120 |
{ |
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121 |
SequenceBlock *current; |
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122 |
SequenceBlockQueueIter iter(*this); |
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123 |
|
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124 |
while (current = iter++, current != NULL) |
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125 |
{ |
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126 |
// Find correct position. |
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127 |
if (aSeq >= current->iRight) |
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128 |
continue; |
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129 |
|
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130 |
// Found? |
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131 |
if (aSeq >= current->iLeft) |
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132 |
return current; |
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133 |
|
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134 |
// We can stop here if we know the queue is ordered. |
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135 |
if (iOrdered) |
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136 |
break; |
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137 |
} |
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138 |
|
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139 |
return NULL; |
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140 |
} |
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141 |
|
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142 |
// |
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143 |
// This only makes sense with ordered queues. |
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144 |
// |
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145 |
EXPORT_C TInt SequenceBlockQueue::FindGap(TTcpSeqNum& aLeft, TTcpSeqNum& aRight) |
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146 |
{ |
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147 |
ASSERT(iOrdered); |
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148 |
|
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149 |
SequenceBlock *current; |
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150 |
SequenceBlockQueueIter iter(*this); |
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151 |
TInt skipped = 0; |
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152 |
|
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153 |
while (current = iter++, current != NULL) |
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154 |
{ |
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155 |
TTcpSeqNum right = current->iRight; |
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156 |
TTcpSeqNum left = current->iLeft; |
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157 |
if (aLeft >= right) |
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158 |
{ |
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159 |
skipped += (right - left); |
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160 |
continue; |
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161 |
} |
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|
162 |
|
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163 |
if (aLeft >= left) |
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164 |
{ |
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165 |
skipped += (right - aLeft); |
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166 |
aLeft = right; |
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167 |
continue; |
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|
168 |
} |
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|
169 |
|
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170 |
aRight = left; |
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171 |
return skipped; |
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172 |
} |
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|
173 |
|
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|
174 |
return -1; |
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|
175 |
} |
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|
176 |
|
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|
177 |
|
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178 |
// |
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179 |
// Remove all contiguous blocks with sequence numbers |
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180 |
// less than aLeft. |
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181 |
// |
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182 |
EXPORT_C void SequenceBlockQueue::Prune(TTcpSeqNum aLeft) |
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183 |
{ |
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184 |
SequenceBlock *current; |
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185 |
SequenceBlockQueueIter iter(*this); |
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|
186 |
|
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187 |
while (current = iter++, current != NULL) |
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|
188 |
{ |
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189 |
TTcpSeqNum right = current->iRight; |
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190 |
TTcpSeqNum left = current->iLeft; |
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|
191 |
|
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|
192 |
// The whole block can go? |
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193 |
if (aLeft >= right) |
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|
194 |
{ |
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|
195 |
iBytes -= (right - left); |
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|
196 |
current->iLink.Deque(); |
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|
197 |
delete current; |
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|
198 |
--iCount; |
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|
199 |
continue; |
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|
200 |
} |
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|
201 |
|
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|
202 |
// Trim left edge of block. |
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203 |
if (aLeft > left) |
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|
204 |
{ |
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|
205 |
iBytes -= (aLeft - left); |
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|
206 |
current->iLeft = aLeft; |
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|
207 |
} |
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|
208 |
|
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|
209 |
// We can stop here if we know the queue is ordered. |
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210 |
if (iOrdered) |
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211 |
return; |
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|
212 |
} |
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|
213 |
|
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214 |
if (iCount <= 1) |
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|
215 |
iOrdered = ETrue; |
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|
216 |
} |
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|
217 |
|
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|
218 |
|
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219 |
// |
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// Remove contiguous blocks from the end of the queue |
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// until at most aCount blocks remain. |
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// |
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EXPORT_C void SequenceBlockQueue::Limit(TInt aCount) |
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{ |
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SequenceBlock *current; |
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SequenceBlockQueueIter iter(*this); |
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|
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iter.SetToLast(); |
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while (iCount > aCount) |
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{ |
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current = iter--; |
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iBytes -= (current->iRight - current->iLeft); |
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current->iLink.Deque(); |
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delete current; |
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--iCount; |
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} |
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|
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if (iCount <= 1) |
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iOrdered = ETrue; |
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} |
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|
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|
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// |
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// Clear the queue. |
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// |
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EXPORT_C void SequenceBlockQueue::Clear() |
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{ |
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SequenceBlock *current; |
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SequenceBlockQueueIter iter(*this); |
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|
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while (current = iter++, current != NULL) |
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{ |
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current->iLink.Deque(); |
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delete current; |
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} |
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iCount = 0; |
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iBytes = 0; |
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iOrdered = ETrue; |
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} |