1 /*

     2 * Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of the License "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description: 

    15 * Cluster class for FileSystem component

    16 * @internalComponent

    17 * @released

    18 *

    19 */

    20 

    21 

    22 #ifndef CLUSTER_H

    23 #define CLUSTER_H

    24 

    25 #include "errorhandler.h"

    26 #include "directory.h"

    27 

    28 typedef std::multimap <unsigned int,unsigned int> TClustersPerEntryMap;

    29 

    30 /*

    31  * This class is used by classes CDirRegion and CLongName. This class describes 

    32  * the basic Data members and Member functions related to cluster number 

    33  * allocation and FAT input map creation.

    34  *

    35  * @internalComponent

    36  * @released

    37  */

    38 

    39 class CCluster

    40 {

    41 	public:

    42 		static CCluster* Instance (unsigned int aClusterSize, 

    43 								   unsigned int aTotalNumberOfClusters);

    44 

    45 		unsigned int GetCurrentClusterNumber() const;

    46 		void DecrementCurrentClusterNumber();

    47 		unsigned short int GetHighWordClusterNumber() const;

    48 		unsigned short int GetLowWordClusterNumber() const;

    49 		void CreateMap(unsigned int aStartingClusterNumber,unsigned int aPairClusterNumber);

    50 		TClustersPerEntryMap* GetClustersPerEntryMap();

    51 		void UpdateNextAvailableClusterNumber();

    52 		unsigned int GetClusterSize() const;

    53 		~CCluster ();

    54 

    55 	private:

    56 		CCluster(unsigned int aClusterSize,

    57 				 unsigned int aTotalNumberOfClusters);

    58 		static CCluster* iClusterInstance;

    59 

    60 		unsigned long int iClusterSize;

    61 		unsigned int iRootClusterNumber;

    62 		unsigned int iCurrentClusterNumber;

    63 		unsigned int iTotalNumberOfClusters;

    64 

    65 		

    66 		/* used to store the mapping of Starting cluster and Number's of

    67 		 * clusters occupied by the specific entry

    68 		 */

    69 		TClustersPerEntryMap iClustersPerEntry;

    70 };

    71 

    72 #endif //CLUSTER_H