1 // Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of the License "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

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

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 // f32\sfat\inc\fat_table.h

    15 // FAT12/16 File Allocation Table classes definitions

    16 // 

    17 //

    18 

    19 /**

    20  @file

    21  @internalTechnology

    22 */

    23 

    24 //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    25 //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    26 //!!

    27 //!! WARNING!! DO NOT edit this file !! '\sfat' component is obsolete and is not being used. '\sfat32'replaces it

    28 //!!

    29 //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    30 //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    31 

    32 

    33 

    34 #ifndef FAT_TABLE_H

    35 #define FAT_TABLE_H

    36 

    37 

    38 //---------------------------------------------------------------------------------------------------------------------------------------

    39 

    40 /**

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

    42 */

    43 class CAtaFatTable : public CFatTable

    44     {

    45 public:

    46     static CAtaFatTable* NewL(CFatMountCB& aOwner);

    47 

    48     //-- overrides from the base class

    49     void FlushL();

    50     void Dismount(TBool aDiscardDirtyData);

    51     void ReMountL();

    52     void InvalidateCacheL(TInt64 aPos, TUint32 aLength);

    53     void InvalidateCacheL();

    54     

    55     TUint32 ReadL(TUint32 aFatIndex) const;

    56     void WriteL(TUint32 aFatIndex, TUint32 aValue);

    57 

    58     TInt64 DataPositionInBytes(TUint32 aCluster) const;

    59 

    60 private:

    61     CAtaFatTable(CFatMountCB& aOwner);

    62     void InitializeL();

    63     void CreateCacheL();

    64 

    65 private:

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

    67     };

    68 

    69 //---------------------------------------------------------------------------------------------------------------------------------------

    70 

    71 /**

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

    73     RAM media only supports Fat12/16.

    74 */

    75 class CRamFatTable : public CFatTable

    76     {

    77 public:

    78     static CRamFatTable* NewL(CFatMountCB& aOwner);

    79 

    80     void ReMountL();

    81     TUint32 ReadL(TUint32 aFatIndex) const;

    82     void WriteL(TUint32 aFatIndex, TUint32 aValue);

    83     TInt64 DataPositionInBytes(TUint32 aCluster) const;

    84     void FreeClusterListL(TUint32 aCluster);

    85     TUint32 AllocateSingleClusterL(TUint32 aNearestCluster);

    86     void ExtendClusterListL(TUint32 aNumber,TInt& aCluster);

    87 

    88 private:

    89     CRamFatTable(CFatMountCB& aOwner);

    90 

    91     void InitializeL();

    92 

    93     inline TUint8 *RamDiskBase() const;

    94     inline TInt AllocateClusterNumber();

    95     inline void WriteFatTable(TInt aFatIndex,TInt aValue);

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

    97     inline void ReadIndirectionTable(TUint32& aCluster) const;

    98     inline void WriteIndirectionTable(TInt aFatIndex,TInt aValue);

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

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

   101     inline void ZeroFillCluster(TInt aCluster); 

   102     

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

   104 

   105 protected:

   106 

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

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

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

   110     };

   111 

   112 

   113 

   114 //---------------------------------------------------------------------------------------------------------------------------------

   115 

   116 

   117 #endif //FAT_TABLE_H

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