author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 18 Jan 2010 21:00:57 +0200 | |
changeset 2 | c32dc0be5eb4 |
parent 0 | 3ad9d5175a89 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2005-2006 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: LRU priority list for the file cache |
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* |
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*/ |
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|
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|
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#include "rsfwlruprioritylist.h" |
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#include "rsfwlrulistnode.h" |
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#include "rsfwfileentry.h" |
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#include "mdebug.h" |
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#include "rsfwvolumetable.h" |
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#include "rsfwvolume.h" |
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#include "rsfwfileengine.h" |
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#include "rsfwfiletable.h" |
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|
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// ---------------------------------------------------------------------------- |
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// CRsfwLruPriorityList::CRsfwLruPriorityList |
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// |
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// ---------------------------------------------------------------------------- |
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// |
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CRsfwLruPriorityList::CRsfwLruPriorityList() |
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: iHdr(CRsfwLruListNode::iOffset),iIter(iHdr) //construct header & iterator |
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{} |
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|
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// ---------------------------------------------------------------------------- |
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// CRsfwLruPriorityList::~CRsfwLruPriorityList |
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// |
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// ---------------------------------------------------------------------------- |
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// |
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CRsfwLruPriorityList::~CRsfwLruPriorityList() |
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{ |
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CRsfwLruListNode* node; |
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|
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iIter.SetToFirst(); |
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node = iIter++; |
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while (node) |
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{ |
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node->iLink.Deque(); |
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delete node; |
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node = iIter++; |
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} |
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} |
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|
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// ---------------------------------------------------------------------------- |
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// CRsfwLruPriorityList::AddNodeL |
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// |
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// ---------------------------------------------------------------------------- |
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// |
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void CRsfwLruPriorityList::AddNodeL(CRsfwFileEntry *aFe, TInt aPriority) |
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{ |
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CRsfwLruListNode* currentNode; |
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iIter.SetToFirst(); |
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|
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currentNode = iIter++; |
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while (currentNode) |
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{ |
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if (currentNode->iEntryPtr->Fid() == aFe->Fid()) |
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{ |
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DEBUGSTRING(("LRU list: '%d' already exists on the list", |
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aFe->Fid().iNodeId)); |
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return; |
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} |
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currentNode = iIter++; |
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} |
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|
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// Inserts the specified list element in descending priority order. |
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// If there is an existing list element with the same priority, |
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// then the new element is added after the existing element. |
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CRsfwLruListNode* newNode = CRsfwLruListNode::NewL(aFe, aPriority); |
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iHdr.Add(*newNode); |
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DEBUGSTRING(("LRU list: added fid '%d' to the list", |
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aFe->Fid().iNodeId)); |
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} |
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|
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|
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// ---------------------------------------------------------------------------- |
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// CRsfwLruPriorityList::RemoveNode |
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// |
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// ---------------------------------------------------------------------------- |
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// |
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TInt CRsfwLruPriorityList::RemoveNode(CRsfwFileEntry *aFe) |
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{ |
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DEBUGSTRING(("CRsfwLruPriorityList::RemoveNode")); |
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// When file is opened, it must be removed from LRU list |
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// as it is not candidate for removal from cache. |
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// Returns KErrNotFound if the file is not found at all |
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TInt err = KErrNotFound; |
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CRsfwLruListNode* currentNode; |
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|
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104 |
iIter.SetToFirst(); |
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|
105 |
|
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106 |
currentNode = iIter++; |
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107 |
while (currentNode) |
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108 |
{ |
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109 |
if (currentNode->iEntryPtr->Fid() == aFe->Fid()) |
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110 |
{ |
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111 |
currentNode->iLink.Deque(); |
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112 |
delete currentNode; |
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113 |
err = KErrNone; |
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DEBUGSTRING(("LRU list: removed fid '%d' from the list", |
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115 |
aFe->Fid().iNodeId)); |
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116 |
break; |
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117 |
} |
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118 |
currentNode = iIter++; |
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119 |
} |
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120 |
return err; |
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121 |
} |
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122 |
|
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123 |
// ---------------------------------------------------------------------------- |
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124 |
// CRsfwLruPriorityList::GetAndRemoveFirstEntry |
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125 |
// |
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126 |
// ---------------------------------------------------------------------------- |
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127 |
// |
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CRsfwFileEntry* CRsfwLruPriorityList::GetAndRemoveFirstEntry() |
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129 |
{ |
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130 |
|
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CRsfwLruListNode* firstNode = iHdr.First(); |
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CRsfwFileEntry* firstEntry = NULL; |
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133 |
|
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134 |
if (iHdr.IsHead(firstNode)) |
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135 |
{ |
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136 |
return NULL; // the head has been reached, and must not be removed |
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137 |
} |
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138 |
|
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139 |
if (firstNode) |
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140 |
{ |
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141 |
firstEntry = firstNode->iEntryPtr; |
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142 |
firstNode->iLink.Deque(); |
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143 |
delete firstNode; |
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144 |
} |
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145 |
|
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146 |
DEBUGSTRING(("LRU list: first fid on the list removed, '%d'", |
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147 |
firstEntry->Fid().iNodeId)); |
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148 |
return firstEntry; |
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149 |
} |
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150 |
|
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151 |
// ---------------------------------------------------------------------------- |
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152 |
// CRsfwFileEntry::ExternalizeL |
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153 |
// ---------------------------------------------------------------------------- |
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154 |
// |
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155 |
void CRsfwLruPriorityList::ExternalizeL(RWriteStream& aStream) |
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156 |
{ |
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157 |
// start from the end! |
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158 |
iIter.SetToLast(); |
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159 |
CRsfwLruListNode* currentNode = iIter--; |
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160 |
while (currentNode) |
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161 |
{ |
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162 |
CRsfwFileEntry* currentEntry = currentNode->iEntryPtr; |
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163 |
if (currentEntry) |
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164 |
{ |
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165 |
TFid fid = currentEntry->Fid(); |
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166 |
aStream.WriteInt32L(fid.iNodeId); |
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167 |
aStream.WriteInt32L(fid.iVolumeId); |
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168 |
} |
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169 |
currentNode = iIter--; |
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170 |
} |
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171 |
} |
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|
172 |
|
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173 |
// ---------------------------------------------------------------------------- |
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174 |
// CRsfwFileEntry::InternalizeL |
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175 |
// ---------------------------------------------------------------------------- |
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176 |
// |
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177 |
void CRsfwLruPriorityList::InternalizeL(RReadStream& aStream, CRsfwVolumeTable* aVolumeTable) |
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178 |
{ |
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179 |
if ( !aVolumeTable ) |
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180 |
{ |
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181 |
User::Leave(KErrArgument); |
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182 |
} |
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|
183 |
|
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184 |
// reset existing list |
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185 |
iHdr.Reset(); |
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186 |
|
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187 |
// get stream size |
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188 |
MStreamBuf* streamBuf = aStream.Source(); |
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189 |
TInt streamSize = streamBuf->SizeL(); |
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190 |
|
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191 |
TInt i; |
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192 |
// note i+8 as one entry takes two TInt32 (2 times 4 bytes) |
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193 |
for ( i = 0; i < streamSize; i = i+8 ) |
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194 |
{ |
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195 |
TFid fid; |
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196 |
fid.iNodeId = aStream.ReadInt32L(); |
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197 |
fid.iVolumeId = aStream.ReadInt32L(); |
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198 |
|
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199 |
// check whether there is no trash in the data being internalized |
2
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|
200 |
if (fid.iVolumeId >= 0 && fid.iVolumeId < KMaxVolumes && fid.iNodeId > 0) |
0
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|
201 |
{ |
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202 |
// find existing CRsfwFileEntry object based on TFid |
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|
203 |
CRsfwVolume* volume = aVolumeTable->iVolumes[fid.iVolumeId]; |
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204 |
if ( volume ) |
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205 |
{ |
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206 |
CRsfwFileEntry* entry = volume->iFileEngine->iFileTable->Root()->Lookup(fid); |
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207 |
if ( entry ) |
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|
208 |
{ |
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|
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AddNodeL(entry, ECachePriorityNormal); |
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} |
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} |
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else |
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{ |
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DEBUGSTRING(("LRU List: wrong item on the list being internalized!")); |
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