imgtools/imglib/filesystem/source/cluster.cpp
author timothy.murphy@nokia.com
Thu, 08 Apr 2010 15:01:11 +0100 (2010-04-08)
branchfix
changeset 472 d1500715c073
parent 0 044383f39525
child 590 360bd6b35136
permissions -rw-r--r--
fix: resource speedup's whatlog handling. update other tests to cope with alternate rpp.d files.
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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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@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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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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@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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Function to get Clusters per Entry MAP container.
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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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TClustersPerEntryMap* CCluster::GetClustersPerEntryMap()
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{
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	return &iClustersPerEntry;
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}