imgtools/imglib/filesystem/include/cluster.h
author yiluzhu
Tue, 26 Jan 2010 14:49:20 +0000 (2010-01-26)
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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 for FileSystem component
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* @internalComponent
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* @released
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*
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*/
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#ifndef CLUSTER_H
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#define CLUSTER_H
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#include "errorhandler.h"
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#include "directory.h"
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typedef std::multimap <unsigned int,unsigned int> TClustersPerEntryMap;
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/*
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 * This class is used by classes CDirRegion and CLongName. This class describes 
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 * the basic Data members and Member functions related to cluster number 
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 * allocation and FAT input map creation.
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 *
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 * @internalComponent
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 * @released
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 */
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class CCluster
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{
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	public:
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		static CCluster* Instance (unsigned int aClusterSize, 
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								   unsigned int aTotalNumberOfClusters);
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		unsigned int GetCurrentClusterNumber() const;
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		void DecrementCurrentClusterNumber();
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		unsigned short int GetHighWordClusterNumber() const;
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		unsigned short int GetLowWordClusterNumber() const;
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		void CreateMap(unsigned int aStartingClusterNumber,unsigned int aPairClusterNumber);
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		TClustersPerEntryMap* GetClustersPerEntryMap();
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		void UpdateNextAvailableClusterNumber();
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		unsigned int GetClusterSize() const;
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		~CCluster ();
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	private:
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		CCluster(unsigned int aClusterSize,
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				 unsigned int aTotalNumberOfClusters);
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		static CCluster* iClusterInstance;
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		unsigned long int iClusterSize;
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		unsigned int iRootClusterNumber;
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		unsigned int iCurrentClusterNumber;
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		unsigned int iTotalNumberOfClusters;
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		/* used to store the mapping of Starting cluster and Number's of
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		 * clusters occupied by the specific entry
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		 */
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		TClustersPerEntryMap iClustersPerEntry;
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};
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#endif //CLUSTER_H