author | timothy.murphy@nokia.com |
Thu, 08 Apr 2010 15:01:11 +0100 (2010-04-08) | |
branch | fix |
changeset 472 | d1500715c073 |
parent 0 | 044383f39525 |
child 590 | 360bd6b35136 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2006-2009 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 the License "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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* Cluster class used to allocate cluster numbers for directory entries |
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* and while writing file contents. And it is responsible to create the |
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* MAP of content starting cluster to ending cluster which can be used |
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* to generate FAT table. Since the cluster number is unique all over the |
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* filesystem component, this class is designed as singleton class. |
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* @internalComponent |
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* @released |
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* |
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*/ |
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#include "cluster.h" |
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//Initialize the Static CCluster instance pointer |
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CCluster* CCluster::iClusterInstance = NULL; |
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/** |
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Static function which is used to instantiate and return the address of CCluster class. |
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@internalComponent |
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@released |
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@param aClusterSize - single cluster size in Bytes |
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@param aTotalNumberOfClusters - Maximum number of clusters |
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@return - returns the instance of CCluster class |
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*/ |
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CCluster* CCluster::Instance(unsigned int aClusterSize,unsigned int aTotalNumberOfClusters) |
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{ |
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if (iClusterInstance == NULL) // is it the first call? |
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{ |
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// create sole instance |
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iClusterInstance = new CCluster(aClusterSize, aTotalNumberOfClusters); |
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} |
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return iClusterInstance; // address of sole instance |
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} |
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/** |
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Destructor: Clears the clusters per entry map |
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@internalComponent |
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@released |
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*/ |
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CCluster::~CCluster () |
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{ |
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iClustersPerEntry.clear(); |
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iClusterInstance = NULL; |
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} |
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/** |
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Constructor Receives inputs from dirregion Class and initializes the class variables |
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@internalComponent |
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@released |
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@param aClusterSize - Size of every Cluster |
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@param aTotalNumberOfClusters - maximum number of clusters allowed for current FAT image |
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*/ |
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CCluster::CCluster(unsigned int aClusterSize, unsigned int aTotalNumberOfClusters) |
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:iClusterSize(aClusterSize),iTotalNumberOfClusters(aTotalNumberOfClusters) |
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{ |
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iRootClusterNumber = KRootClusterNumber; |
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iCurrentClusterNumber = iRootClusterNumber; |
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} |
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/** |
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Function to return the current cluster number |
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@internalComponent |
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@released |
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@return - returns the current cluster number |
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*/ |
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unsigned int CCluster::GetCurrentClusterNumber() const |
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{ |
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return iCurrentClusterNumber; |
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} |
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/** |
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Function to decrement the current cluster number |
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@internalComponent |
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@released |
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*/ |
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void CCluster::DecrementCurrentClusterNumber() |
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{ |
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--iCurrentClusterNumber; |
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} |
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/** |
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Function to get the High word of Current cluster number |
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@internalComponent |
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@released |
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@return - returns the 16 bit HIGH word |
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*/ |
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unsigned short int CCluster::GetHighWordClusterNumber() const |
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{ |
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return (unsigned short)(iCurrentClusterNumber >> KBitShift16); |
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} |
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/** |
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Function to get the Low word of Current cluster number |
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@internalComponent |
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@released |
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@return - returns the 16 bit LOW word |
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*/ |
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unsigned short int CCluster::GetLowWordClusterNumber() const |
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{ |
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return (unsigned short)(iCurrentClusterNumber & KHighWordMask); |
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} |
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/** |
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Function responsible to |
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1. Increment the current Cluster Number |
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2. Throw the error "image size too big" if the allocated clusters count exceeds total |
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number of available clusters. |
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@internalComponent |
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@released |
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*/ |
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void CCluster::UpdateNextAvailableClusterNumber() |
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{ |
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if(iCurrentClusterNumber >= iTotalNumberOfClusters) |
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{ |
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throw ErrorHandler(IMAGESIZETOOBIG,"Occupied number of clusters count exceeded than available clusters",__FILE__,__LINE__); |
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} |
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++iCurrentClusterNumber; |
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} |
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/** |
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Function to Return the cluster size |
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|
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@internalComponent |
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@released |
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@return the cluster size |
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*/ |
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unsigned int CCluster::GetClusterSize() const |
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{ |
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return iClusterSize; |
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} |
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|
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/** |
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Function Creates mapping between starting cluster number (where data starts) and |
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the sub sequent cluster numbers (where the data extends). |
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|
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@internalComponent |
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@released |
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@param aStartingClusterNumber - Cluster number where the data starts |
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@param aPairClusterNumber - Cluster number where the data extends |
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*/ |
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void CCluster::CreateMap(unsigned int aStartingClusterNumber,unsigned int aPairClusterNumber) |
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{ |
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iClustersPerEntry.insert(std::make_pair(aStartingClusterNumber,aPairClusterNumber)); |
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} |
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|
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/** |
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Function to get Clusters per Entry MAP container. |
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|
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@internalComponent |
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@released |
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@return - returns the CLusters per entry container |
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*/ |
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|
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TClustersPerEntryMap* CCluster::GetClustersPerEntryMap() |
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{ |
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return &iClustersPerEntry; |
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} |