/*

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

* All rights reserved.

* This component and the accompanying materials are made available

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

* which accompanies this distribution, and is available

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

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

* FAT32 file system Class for FileSystem component

* @internalComponent

* @released

*

*/

#ifndef FAT32FILESYSTEM_H

#define FAT32FILESYSTEM_H

#include "filesystemclass.h"

#include "errorhandler.h"

#include "dirregion.h"

#include "filesysteminterface.h"

// constant values to initialize FSInfo data structure

const unsigned int KFSIleadSign=0x41615252;

const unsigned int KFSIStrutSign=0x61417272;

const unsigned int KFSIFreeCount=0xFFFFFFFF;

const unsigned int KFSITrailSign=0xAA550000;

//sector number containing copy of FAT Table and Boot sector

const unsigned int KBootBackupSector=6;

const unsigned int KFatBackupSector=7;

/**

Class representing FSINFO DataStrcuture

@internalComponent

@released

*/

class FSInfo

{

public: 

	void SetFSInfo();

public:

	//lead signature use to validate a FSInfo structure

	unsigned int FSI_LeadSign;

	//field for future expansion

	unsigned char FSI_Reserved[KFSIFutureExpansion];

	//another signature

	unsigned int FSI_StrucSig;

	//contains the last known free cluster count on the  volume

	unsigned int FSI_Free_Count;

	//indicates the cluster number at which the driver should start looking for free clusters

	unsigned int FSI_Nxt_Free;

	//reserved for future expansion

	unsigned int FSI_Reserved2[KFSIKFSIFutureExpansion2];

	//use to validate that this is an fact an FSInfo sector

	unsigned int FSI_TrailSig;

};

// Use to initialize the FSInfo data structure

inline void FSInfo::SetFSInfo()

{

	FSI_LeadSign=KFSIleadSign;

	for(int i=0;i<KFSIFutureExpansion;i++)

		FSI_Reserved[i]=0;

	FSI_StrucSig=KFSIStrutSign;

	FSI_Free_Count=KFSIFreeCount;

	FSI_Nxt_Free=KFSIFreeCount;

	for(int j=0;j<KFSIKFSIFutureExpansion2;j++)

		FSI_Reserved2[j]=0;

	FSI_TrailSig=KFSITrailSign;

}

/**

Class representing concrete class representing FAT32 type 

@internalComponent

@released

*/

class CFat32FileSystem : public CFileSystem

{

public:

	CFat32FileSystem(){};

	~CFat32FileSystem();

public:

	void CreateBootSector(Long64 aPartitionSize,ConfigurableFatAttributes* aConfigurableFatAttributes);

	void WriteBootSector(ofstream& aOutPutStream);

	void CreateFatTable(ofstream& aOutPutStream);

	void CreateFSinfoSector(ofstream& aOutPutStream);

	void RestReservedSectors(ofstream& aOutPutStream);

	void ComputeClusterSizeInBytes();

	void ComputeRootDirSectors();

	void ComputeBytesPerSector();

	void ComputeTotalClusters(Long64 aPartitionSize);

	void Execute(Long64 aPartitionSize,EntryList aNodeList,

				ofstream& aOutPutStream,ConfigurableFatAttributes* aConfigurableFatAttributes);

	void ErrorExceptionClean();

private:

	TFAT32BootSector iFAT32BootSector;

	//use to contain the data structure used to create a FAT Table

	TClustersPerEntryMap* iClustersPerEntry;

	FSInfo iFSInfo; //FSInfo data structure

	//Pointer to dynamic array representing the content of FSInfo data structure

	unsigned char* FSinfoData;

};

#endif //FAT32FILESYSTEM_H