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// Copyright (c) 1998-2009 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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// f32\sfat\inc\fat_table.h
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// FAT12/16 File Allocation Table classes definitions
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//
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//
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/**
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@file
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@internalTechnology
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*/
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//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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//!!
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//!! WARNING!! DO NOT edit this file !! '\sfat' component is obsolete and is not being used. '\sfat32'replaces it
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//!!
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//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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#ifndef FAT_TABLE_H
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#define FAT_TABLE_H
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//---------------------------------------------------------------------------------------------------------------------------------------
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/**
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Fat table used for all media except RAM, manages the Fat table for all cluster requests.
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*/
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class CAtaFatTable : public CFatTable
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{
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public:
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static CAtaFatTable* NewL(CFatMountCB& aOwner);
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//-- overrides from the base class
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void FlushL();
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void Dismount(TBool aDiscardDirtyData);
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void ReMountL();
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void InvalidateCacheL(TInt64 aPos, TUint32 aLength);
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void InvalidateCacheL();
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TUint32 ReadL(TUint32 aFatIndex) const;
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void WriteL(TUint32 aFatIndex, TUint32 aValue);
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TInt64 DataPositionInBytes(TUint32 aCluster) const;
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private:
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CAtaFatTable(CFatMountCB& aOwner);
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void InitializeL();
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void CreateCacheL();
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private:
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CFatCacheBase* iCache; ///< FAT cache, fixed or LRU depending on the FAT type
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};
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//---------------------------------------------------------------------------------------------------------------------------------------
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/**
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Fat table used for RAM media, manages the Fat table for all cluster requests.
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RAM media only supports Fat12/16.
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*/
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class CRamFatTable : public CFatTable
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{
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public:
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static CRamFatTable* NewL(CFatMountCB& aOwner);
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void ReMountL();
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TUint32 ReadL(TUint32 aFatIndex) const;
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void WriteL(TUint32 aFatIndex, TUint32 aValue);
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TInt64 DataPositionInBytes(TUint32 aCluster) const;
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void FreeClusterListL(TUint32 aCluster);
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TUint32 AllocateSingleClusterL(TUint32 aNearestCluster);
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void ExtendClusterListL(TUint32 aNumber,TInt& aCluster);
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private:
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CRamFatTable(CFatMountCB& aOwner);
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void InitializeL();
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inline TUint8 *RamDiskBase() const;
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inline TInt AllocateClusterNumber();
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inline void WriteFatTable(TInt aFatIndex,TInt aValue);
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inline void WriteFatTable(TInt aFatIndex,TInt aFatValue,TInt anIndirectionTableValue);
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inline void ReadIndirectionTable(TUint32& aCluster) const;
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inline void WriteIndirectionTable(TInt aFatIndex,TInt aValue);
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inline TUint8* MemCopy(TAny* aTrg,const TAny* aSrc,TInt aLength);
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inline TUint8* MemCopyFillZ(TAny* aTrg, TAny* aSrc, TInt aLength);
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inline void ZeroFillCluster(TInt aCluster);
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void UpdateIndirectionTable(TUint32 aStartCluster,TUint32 anEndCluster,TInt aNum);
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protected:
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TInt iFatTablePos; ///< Current position in the fat table
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TInt iIndirectionTablePos; ///< Current position in indirection table, second fat used for this
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TUint8* iRamDiskBase; ///< Pointer to the Ram disk base
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};
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//---------------------------------------------------------------------------------------------------------------------------------
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#endif //FAT_TABLE_H
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