author | John Imhofe |
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changeset 16 | f3f3987b99ac |
parent 2 | 4122176ea935 |
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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 '\sfat' component is obsolete and is not being used.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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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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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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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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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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