// Copyright (c) 1998-2009 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:

// f32\sfat\inc\fat_table.h

// FAT12/16 File Allocation Table classes definitions

// 

//

/**

 @file

 @internalTechnology

*/

#ifndef FAT_TABLE_H

#define FAT_TABLE_H

//---------------------------------------------------------------------------------------------------------------------------------------

/**

    Fat table used for all media except RAM, manages the Fat table for all cluster requests.

*/

class CAtaFatTable : public CFatTable

	{

public:

    static CAtaFatTable* NewL(CFatMountCB& aOwner);

    //-- overrides from the base class

	void FlushL();

	void Dismount(TBool aDiscardDirtyData);

    void ReMountL();

	void InvalidateCacheL(TInt64 aPos, TUint32 aLength);

	void InvalidateCacheL();

	TUint32 ReadL(TUint32 aFatIndex) const;

	void WriteL(TUint32 aFatIndex, TUint32 aValue);

	TInt64 DataPositionInBytes(TUint32 aCluster) const;

private:

	CAtaFatTable(CFatMountCB& aOwner);

    void InitializeL();

    void CreateCacheL();

private:

    CFatCacheBase* iCache;  ///< FAT cache, fixed or LRU depending on the FAT type

	};

//---------------------------------------------------------------------------------------------------------------------------------------

/**

    Fat table used for RAM media, manages the Fat table for all cluster requests. 

    RAM media only supports Fat12/16.

*/

class CRamFatTable : public CFatTable

	{

public:

    static CRamFatTable* NewL(CFatMountCB& aOwner);

    void ReMountL();

	TUint32 ReadL(TUint32 aFatIndex) const;

	void WriteL(TUint32 aFatIndex, TUint32 aValue);

	TInt64 DataPositionInBytes(TUint32 aCluster) const;

	void FreeClusterListL(TUint32 aCluster);

	TUint32 AllocateSingleClusterL(TUint32 aNearestCluster);

	void ExtendClusterListL(TUint32 aNumber,TInt& aCluster);

private:

	CRamFatTable(CFatMountCB& aOwner);

	void InitializeL();

	inline TUint8 *RamDiskBase() const;

	inline TInt AllocateClusterNumber();

	inline void WriteFatTable(TInt aFatIndex,TInt aValue);

	inline void WriteFatTable(TInt aFatIndex,TInt aFatValue,TInt anIndirectionTableValue);

	inline void ReadIndirectionTable(TUint32& aCluster) const;

	inline void WriteIndirectionTable(TInt aFatIndex,TInt aValue);

	inline TUint8* MemCopy(TAny* aTrg,const TAny* aSrc,TInt aLength);

	inline TUint8* MemCopyFillZ(TAny* aTrg, TAny* aSrc, TInt aLength);

	inline void ZeroFillCluster(TInt aCluster); 

	void UpdateIndirectionTable(TUint32 aStartCluster,TUint32 anEndCluster,TInt aNum);

protected:

	TInt iFatTablePos;          ///< Current position in the fat table

	TInt iIndirectionTablePos;  ///< Current position in indirection table, second fat used for this

	TUint8* iRamDiskBase;       ///< Pointer to the Ram disk base

	};

//---------------------------------------------------------------------------------------------------------------------------------

#endif //FAT_TABLE_H