userlibandfileserver/fileserver/sfat32/sl_fatcache.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 07 Jan 2010 13:38:45 +0200
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child 8 538db54a451d
permissions -rw-r--r--
Revision: 201001 Kit: 201001
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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\sl_facache.h
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// FAT cache base classes definition
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// FAT12 and FAT16 cache classes definition
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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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#ifndef SL_FAT_CACHE_H
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#define SL_FAT_CACHE_H
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//-----------------------------------------------------------------------------
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/**
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    A simple abstraction of the 32 bit flags
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*/
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class T32Bits
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{
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 public:
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    T32Bits() : iData(0) {}
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    inline void  Clear();
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    inline TBool HasBitsSet() const;
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    inline void SetBit(TUint32 aIndex);
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    inline TBool operator[](TUint32 aIndex) const;
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 private:
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    TUint32 iData; ///< 32 bits data
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};
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//-----------------------------------------------------------------------------
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class CFatBitCache;
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/**
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    An abstract base class for all types of FAT caches.
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    Provides user interface and some common for all types of FAT caches functionality.
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*/
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class CFatCacheBase : public CBase
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{
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 public:
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    virtual ~CFatCacheBase();
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    //-- public interface
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    virtual void Close(TBool /*aDiscardDirtyData*/) {};
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    virtual void FlushL() = 0;
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    virtual TUint32 ReadEntryL(TUint32 aIndex) = 0;
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    virtual void WriteEntryL(TUint32 aIndex, TUint32 aEntry) = 0;
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    virtual TInt Invalidate() = 0;
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    virtual TInt InvalidateRegion(TUint32 aStartEntry, TUint32 aNumEntries) = 0;
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    TInt ReadFatData(TUint32 aPos, TUint32 aLen, TDes8& aData) const;
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    TInt WriteFatData(TUint32 aPos, const TDesC8& aData) const;
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    inline TUint32  FatStartPos() const;
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    inline TUint32  FatSize() const;
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    inline TFatType FatType() const;
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 public:
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    //-- auxilary interface to additional bit supercache (it may exist only in FAT32 cache implementation)
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    virtual CFatBitCache* BitCacheInterface();
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 protected:
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    CFatCacheBase();
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    virtual void InitialiseL(CFatMountCB* aOwner);
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    inline TBool IsDirty() const;
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    inline void SetDirty(TBool aDirty);
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    inline TUint NumFATs() const;
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    TBool CheckInvalidatingDirtyCache() const;
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    inline TUint FAT_SectorSzLog2() const;
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    inline TUint FAT_SectorSz() const; 
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    inline TUint FAT_ClusterSzLog2() const;
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 protected:
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    enum {KInvalidFatNo = 0xFF}; ///< used to invalidate current FAT no.
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    TUint   iCurrentFatNo;       ///< current FAT number WriteFatData will write to.
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 private:    
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    //-- values cached from owning mount.
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    TUint32     iFatStartPos;   ///< media position of FAT1 start 
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    TUint32     iFatSize;       ///< size of FAT in bytes
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    TUint16     iNumFATs;       ///< number of FATs on the volume
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    TUint16     iFatSecSzLog2;  ///< Log2(FAT Sector size)
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    TUint16     iFatClustSzLog2;///< Log2(FAT cluster size)
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    TFatType    iFatType;       ///< FAT type
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    TDriveInterface* ipDrive;///< interface to the media driver
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    //---
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    TBool       iDirty;         ///< ETrue if the cache is dirty
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};
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//-----------------------------------------------------------------------------
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/**
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    Fixed FAT12 cache. This is a contiguous cache that caches whole FAT12.
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    This cache is logically divided to sectors, maximal number of sectors in this cache is KMaxSectorsInCache (32).
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    Read granularity: whole cache; anyway it can't be larger than 6126 bytes.
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    Write granularity: cache sector size, which is always "FAT Sector Size" and non-configurable.
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*/
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class CFat12Cache : public CFatCacheBase
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{
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    static CFat12Cache* NewL(CFatMountCB* aOwner, TUint32 aFatSize);
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    //-- overrides from base class
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    virtual void Close(TBool aDiscardDirtyData);
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    virtual void FlushL();
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    virtual TUint32 ReadEntryL(TUint32 aIndex);
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    virtual void WriteEntryL(TUint32 aIndex, TUint32 aEntry);
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    virtual TInt Invalidate();
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    virtual TInt InvalidateRegion(TUint32 aStartEntry, TUint32 aNumEntries);
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    //------------------------------------
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 private:
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    void InitialiseL(CFatMountCB* aOwner, TUint32 aFatSize); 
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    CFat12Cache();
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    CFat12Cache(const CFat12Cache&);
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    CFat12Cache& operator=(const CFat12Cache&);
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    inline TUint32 NumSectors() const;
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    void AssertCacheReallyClean() const;
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 private:
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    enum {KMaxSectorsInCache = 32};  ///< maximal number sectors in FAT12 cache
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    enum {KFat12EntryMask = 0x0FFF}; ///< FAT12 entry mask
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    TUint32 iSectorsInCache;    ///< total number sectors in the cache, KMaxSectorsInCache max.
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    T32Bits iDirtySectors;      ///< dirty sectors bitmap. '1' bit corresponds to the dirty sector;
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    RBuf8   iData;              ///< Whole FAT12 cache data.
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};
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//-----------------------------------------------------------------------------
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/**
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    Abstract base class for paged caches, i.e. those that consist of some number of cache pages.
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    In this case the most of the functionality is implemented in page classes and this is just a page container.
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    Each cache page in turn is logically divided to sectors. The sector is a logical unit of write granularity
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    See also CFatCachePageBase et al.
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*/
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class CFatPagedCacheBase : public CFatCacheBase
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{
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 public:
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    inline TUint PageSizeLog2()  const;
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    inline TUint PageSize()      const;
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    inline TUint SectorSizeLog2() const;
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    inline TUint SectorsInPage()  const;
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 protected:
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    CFatPagedCacheBase();
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 protected:
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    enum {KMaxSectorsInPage = 32}; ///< maximal number sectors in FAT cache page
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    TUint iPageSizeLog2;    ///< Log2(page size)
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    TUint iSectorSizeLog2;  ///< Log2(page sector size)
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};
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//-----------------------------------------------------------------------------
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class CFat16FixedCachePage;
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/**
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    FAT16 fixed paged cache. Used for FAT16 only and caches whole FAT16 (its max size is 131048 bytes).
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    Consists of the fixed array of cache pages; Pages are allocated on demand and never get evicted.
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    Each page is logically divided to page sectors. The number of pages depends on the FAT16 size.
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    Read granularity: One page, which size is 2^aRdGranularityLog2
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    Write granularity: cache's page sector; its size is 2^aWrGranularityLog2
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*/
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class CFat16FixedCache : public CFatPagedCacheBase
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{
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 public:
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    static CFat16FixedCache* NewL(CFatMountCB* aOwner, TUint32 aFatSize, TUint32 aRdGranularityLog2, TUint32 aWrGranularityLog2);
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    //-- overrides from base class
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    virtual void Close(TBool aDiscardDirtyData);
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    virtual void FlushL();
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    virtual TUint32 ReadEntryL(TUint32 aIndex);
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    virtual void WriteEntryL(TUint32 aIndex, TUint32 aEntry);
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    virtual TInt Invalidate();
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    virtual TInt InvalidateRegion(TUint32 aStartEntry, TUint32 aNumEntries);
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    //------------------------------------
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 private:
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    void InitialiseL(CFatMountCB* aOwner, TUint32 aFatSize, TUint32 aRdGranularityLog2, TUint32 aWrGranularityLog2); 
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    CFat16FixedCache();
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    CFat16FixedCache(const CFat16FixedCache&);
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    CFat16FixedCache& operator=(const CFat16FixedCache&);
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    inline TUint NumPages() const;
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    void AssertCacheReallyClean() const;
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 private:    
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    RPointerArray<CFat16FixedCachePage> iPages;  ///< array of pointer to the cahe pages; if the entry is NULL, it means that the page isn't allocated yet.
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};
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//-----------------------------------------------------------------------------
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/**
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    An abstract base class for the cache page. Paged caches, i.e derived form CFatPagedCacheBase uses this functionality.
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    Provides an interface and common functionality for all types of cache pages.
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    The FAT cache page contains a number of FAT16 or FAT32 entries, their number is always the power of 2.
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    The page is logically divided into sectors, the maximal number of sectors in the page is KMaxSectorsInPage (32).
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    The page read granularity is whole page and the write granularity is the sector  (see aRdGranularityLog2, aWrGranularityLog2 from the cache)
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    The caching is write-back, i.e WriteCachedEntryL() modifies data in the cache and marks corresponding page sector as dirty.
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    FlushL() shall be called to flust all dirty sectors in page to the media
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*/
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class CFatCachePageBase : public CBase
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{
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public:
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    ~CFatCachePageBase();
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    //----------------
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    virtual TBool ReadCachedEntryL (TUint32 aFatIndex, TUint32& aResult) = 0;
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    virtual TBool WriteCachedEntryL(TUint32 aFatIndex, TUint32 aFatEntry) = 0; 
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    virtual TUint32 ReadFromMediaL(TUint32 aFatIndex) = 0;
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    virtual void FlushL(TBool aKeepDirty);
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    //----------------
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    inline TBool IsEntryCached(TUint32 aFatIndex) const ;
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    void Invalidate(TBool aIgnoreDirtyData = EFalse);
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    inline TBool IsDirty() const;
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    inline TBool IsValid() const;
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    inline TUint32 StartFatIndex() const;
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protected:
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    CFatCachePageBase(CFatPagedCacheBase& aCache);
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    /** possible states of the page */
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    enum TState
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        {
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        EInvalid, ///< the page's data are invalid
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        EClean,   ///< the page is clean, data valid and the same as on the media  
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        EDirty    ///< the page is dirty, there are data eventually to be flushed to the media, iDirtySectors contains dirty sectors bitmap.
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        };
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    inline void SetState(TState aState);
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    inline TState State() const;
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    inline void SetClean();
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    inline TUint32 PageSize() const; 
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    inline TUint32 NumSectors() const; 
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    virtual void DoWriteSectorL(TUint32 aSector)=0;
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    inline TUint32 EntriesInPage() const;
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protected:
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    TUint32 iStartIndexInFAT;   ///< FAT index this page starts from
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    T32Bits iDirtySectors;      ///< dirty sectors bitmap. '1' bit corresponds to the dirty sector;
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    CFatPagedCacheBase& iCache; ///< reference to the owher cache
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    RBuf8   iData;              ///< page Data
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private:
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    TState  iState;             ///< page state
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    TUint32 iFatEntriesInPage;  ///< number of FAT entries in the page. 
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};
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//---------------------------------------------------------------------------------------------------------------------------------
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/**
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    FAT16 cache page. Used only by CFat16FixedCache.
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*/
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class CFat16FixedCachePage : public CFatCachePageBase
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{
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 public:
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    ~CFat16FixedCachePage() {}
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    static CFat16FixedCachePage* NewL(CFatPagedCacheBase& aCache);
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    //-- overrides
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    virtual TBool ReadCachedEntryL (TUint32 aFatIndex, TUint32& aResult);
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    virtual TBool WriteCachedEntryL(TUint32 aFatIndex, TUint32 aFatEntry); 
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    virtual TUint32 ReadFromMediaL(TUint32 aFatIndex);
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    //----
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 private:
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    CFat16FixedCachePage(CFatPagedCacheBase& aCache);
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    //-- outlaws here
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    CFat16FixedCachePage();
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    CFat16FixedCachePage(const CFat16FixedCachePage&);
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    CFat16FixedCachePage& operator=(const CFat16FixedCachePage&);
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    virtual void DoWriteSectorL(TUint32 aSector);
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    inline TFat16Entry* GetEntryPtr(TUint32 aFatIndex) const;
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 private:
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    enum {KFat16EntryMask = 0xFFFF}; ///< FAT16 entry mask
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};
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//---------------------------------------------------------------------------------------------------------------------------------
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#include "sl_fatcache.inl"
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#endif //SL_FAT_CACHE_H
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