author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 07 Jan 2010 13:38:45 +0200 | |
changeset 10 | 36bfc973b146 |
parent 9 | 96e5fb8b040d |
child 8 | 538db54a451d |
permissions | -rw-r--r-- |
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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\sfat32\inc\fat_table32.h |
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// FAT32 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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#ifndef FAT_TABLE_32_H |
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#define FAT_TABLE_32_H |
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//--------------------------------------------------------------------------------------------------------------------------------------- |
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class CFatHelperThreadBase; |
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class CFat32ScanThread; |
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TInt FAT32_ScanThread(TAny* apHostObject); |
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//--------------------------------------------------------------------------------------------------------------------------------------- |
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/** |
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Fat table abstraction for all media types except RAM. |
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Supports FAT12/16/32 |
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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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~CAtaFatTable(); |
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//-- overrides from th ebase class |
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TUint32 ReadL(TUint32 aFatIndex) const; |
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void WriteL(TUint32 aFatIndex, TUint32 aValue); |
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void MountL(const TMountParams& aMountParam); |
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TInt64 DataPositionInBytes(TUint32 aCluster) const; |
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void InitializeL(); |
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void Dismount(TBool aDiscardDirtyData); |
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void FlushL(); |
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void InvalidateCacheL(); |
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void InvalidateCacheL(TInt64 aPos, TUint32 aLength); |
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TUint32 FreeClusterHint() const; |
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TUint32 NumberOfFreeClusters(TBool aSyncOperation=EFalse) const; |
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TBool ConsistentState() const; |
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inline void AcquireLock() const {iDriveInteface.AcquireLock();} |
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inline void ReleaseLock() const {iDriveInteface.ReleaseLock();} |
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inline TDriveInterface& DriveInterface() const; |
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inline CFatMountCB* OwnerMount() const; |
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private: |
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/** internal states of this object */ |
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enum TState |
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{ |
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ENotInitialised, ///< 0 initial invalid state |
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EInitialised, ///< 1 initialised, i.e. internal objects created, but unusable becasue number of free entries isn't known |
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EMounting, ///< 2 mounting started |
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EMounted, ///< 3 successfully mounted; number of free entries is known. This is the only consistent state. |
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EDismounted, ///< 4 FAT table object is dismounted |
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EFreeClustersScan, ///< 5 FAT32 scan thread is currently scanning FAT table for free clusters |
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EMountAborted ///< 6 Mounting failed, probably because of FAT32 free clusters scan thread failure. |
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}; |
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public: |
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/** A helper class used in FAT scanning for free clusters*/ |
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class TFatScanParam |
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{ |
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public: |
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inline TFatScanParam(); |
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public: |
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TUint32 iEntriesScanned; ///< total number of FAT entries scanned by DoParseFatBuf() |
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TUint32 iFirstFree; ///< first free FAT entry found |
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TUint32 iCurrFreeEntries; ///< current number of free FAT entries found by DoParseFatBuf() |
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TUint32 iCurrOccupiedEntries; ///< current number of non-free FAT entries found by DoParseFatBuf() |
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}; |
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private: |
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CAtaFatTable(CFatMountCB& aOwner); |
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void RequestRawWriteAccess(TInt64 aPos, TUint32 aLen) const; |
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void SetFreeClusters(TUint32 aFreeClusters); |
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void SetFreeClusterHint(TUint32 aCluster); |
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void CountFreeClustersL(); |
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void CreateCacheL(); |
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virtual void DecrementFreeClusterCount(TUint32 aCount); |
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virtual void IncrementFreeClusterCount(TUint32 aCount); |
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virtual TUint32 FindClosestFreeClusterL(TUint32 aCluster); |
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void DoCountFreeClustersL(); |
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void DoParseFatBuf(const TPtrC8& aBuf, TFatScanParam& aScanParam) const; |
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TBool RequestFreeClusters(TUint32 aClustersRequired) const; |
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void DoLaunchFat32FreeSpaceScanThreadL(); |
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void DestroyHelperThread(); |
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inline TState State() const; |
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inline void SetState(TState aState); |
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private: |
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10
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CFatCacheBase* iCache; ///< FAT cache, fixed or LRU depending on the FAT type |
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TDriveInterface& iDriveInteface; ///< reference to the drive interface |
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CFatHelperThreadBase* ipHelperThread; ///< helper thread object pointer. NULL if it is not present |
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TState iState; ///< state of this object |
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//-- friends |
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friend TInt FAT32_ScanThread(TAny* apHostObject); |
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friend class CFat32ScanThread; |
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friend class CFat32FreeSpaceScanner; |
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friend class CFat32BitCachePopulator; |
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}; |
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//--------------------------------------------------------------------------------------------------------------------------------------- |
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/** |
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Fat table abstraction for RAM media type. |
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Supports FAT16/32 only |
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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 InitializeL(); |
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void MountL(const TMountParams& aMountParam); |
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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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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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/** |
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Abstract base class for the FAT32 helper threads. |
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Provides basic functionality of the helper threads and interface to the owher CAtaFatTable. |
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*/ |
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class CFatHelperThreadBase : public CBase |
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{ |
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public: |
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/** Possible types of the FAT32 helper threads */ |
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enum TFatHelperThreadType |
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{ |
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EInvalidType, ///< invalid type |
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EFreeSpaceScanner, ///< Free FAT32 entries counter, see CFat32FreeSpaceScanner |
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EBitCachePopulator ///< FAT32 bit supercache populating thread. |
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}; |
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/** this object states, mostly related to the worker thread activity and results */ |
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enum TState |
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{ |
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EInvalid, ///< invalid initial state |
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ENotStarted, ///< the worker thread hasn't started yet |
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EWorking, ///< worker thread is working |
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EFinished_OK, ///< worker thread has successfully finished, everything is fine. |
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EFailed ///< worker thread failed to finish its job for some reason; see the thread completion status |
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}; |
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public: |
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~CFatHelperThreadBase(); |
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//-- virtual interface |
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virtual TFatHelperThreadType Type() const = 0; |
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virtual TInt Launch()=0; |
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virtual void RequestFatEntryWriteAccess(TUint32 aFatIndex) const=0; |
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//-- non-virtual interface for external user only |
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void Close(); |
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void ForceStop(); |
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inline TState State() const; |
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inline void Suspend() const; |
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inline void Resume() const; |
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inline TInt ThreadCompletionCode() const; |
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inline TBool ThreadWorking() const; |
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inline void BoostPriority(TBool aBoost) const; |
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inline TBool IsPriorityBoosted() const; |
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inline TThreadId ThreadId() const; |
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TInt WaitToFinish() const; |
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protected: |
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CFatHelperThreadBase(CAtaFatTable& aOwner); |
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//-- outlaws |
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CFatHelperThreadBase(); |
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CFatHelperThreadBase(const CFatHelperThreadBase&); |
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CFatHelperThreadBase& operator=(const CFatHelperThreadBase&); |
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/** the worker thread priorities values */ |
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enum |
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{ |
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EHelperPriorityNormal = EPriorityMuchLess, ///< FAT32 Helper thread normal priority (assigned on start) |
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EHelperPriorityBoosted = EPriorityNormal ///< FAT32 Helper thread bosted priority |
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}; |
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TInt DoLaunchThread(TThreadFunction aFunction, TAny* aThreadParameter); |
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inline void SetState(TState aState); |
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inline TBool AllowedToLive() const; |
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inline void AllowToLive(TBool aAllow); |
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protected: |
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CAtaFatTable& iOwner; ///< owner, CAtaFatTable |
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private: |
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TState iState; ///< internal state of this object |
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RThread iThread; ///< FAT helper thread handle |
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mutable TRequestStatus iThreadStatus; ///< helper thread logon status |
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TBool iAllowedToLive : 1; ///< if EFalse the worker thread must gracefully finish ASAP. |
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mutable TBool iPriorityBoosted : 1; ///< ETrue when thread priority is boosted by BoostPriority() call |
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}; |
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//--------------------------------------------------------------------------------------------------------------------------------------- |
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/** |
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Abstract base class for the FAT32 helper threads that read FAT by big chunks of data and parse it. |
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Provides basic functionality of the helper threads and interface to the owher CAtaFatTable. |
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*/ |
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class CFat32ScanThread : public CFatHelperThreadBase |
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{ |
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public: |
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virtual TInt Launch(); |
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protected: |
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CFat32ScanThread(CAtaFatTable& aOwner); |
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//-- virtual private interface for the thread function. |
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virtual TInt Thread_Preamble(); |
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virtual TInt Thread_Postamble(TInt aResult); |
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virtual TInt Thread_ProcessCollectedFreeEntries(const CAtaFatTable::TFatScanParam& aFatScanParam)=0; |
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friend TInt FAT32_ScanThread(TAny* apHostObject); ///< FAT32 scanner thread function, generic functionality for derived classes |
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protected: |
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RBuf8 iFatChunkBuf; ///< a buffer for reading FAT directly from the media |
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TTime iTimeStart; ///< thread start time, used to measure how long thread worked |
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TTime iTimeEnd; ///< thread end time, used to measure how long thread worked |
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CFatBitCache *ipFatBitCache; ///< interface to the FAT bit supercache (if it is present) |
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}; |
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//--------------------------------------------------------------------------------------------------------------------------------------- |
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/** |
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FAT32 free FAT entries scanner thread. |
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Represents transient FAT32 helper thread that can be launched on FAT table object mounting stage and will be |
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counting free FAT entries in order to find out free space on the volume. |
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*/ |
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class CFat32FreeSpaceScanner : public CFat32ScanThread |
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{ |
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public: |
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static CFat32FreeSpaceScanner* NewL(CAtaFatTable& aOwner); |
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virtual inline TFatHelperThreadType Type() const; |
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private: |
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CFat32FreeSpaceScanner(CAtaFatTable& aOwner); |
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void RequestFatEntryWriteAccess(TUint32 aFatIndex) const; |
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//-- virtual private interface for the thread function. |
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TInt Thread_Preamble(); |
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TInt Thread_Postamble(TInt aResult); |
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TInt Thread_ProcessCollectedFreeEntries(const CAtaFatTable::TFatScanParam& aFatScanParam); |
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//-- |
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private: |
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void SetClustersScanned(TUint32 aClusters); |
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TUint32 ClustersScanned() const; |
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friend TInt FAT32_ScanThread(TAny* apHostObject); ///< FAT32 scanner thread function, generic functionality for CFat32ScanThread derived classes |
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private: |
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enum |
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{ |
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KFatChunkBufSize_Small = 16*K1KiloByte, //-- buffer size for reading small FAT tables |
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KFatChunkBufSize_Big = 64*K1KiloByte, //-- buffer size for reading large FAT tables |
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KBigSzFat_Threshold = 2*K1MegaByte, //-- if FAT table size > this value, larger FAT read chunk (KFatChunkBufSize_Big) will be used |
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}; |
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TUint32 iClustersScanned; ///< Number of FAT entries already scanned by the thread. Counts from the beginning of the FAT |
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//-- volume space treshold in bytes that causes CMountCB::SetDiskSpaceChange() to be called by FAT32 free space scanner thread. |
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//-- This thread will be calling CMountCB::SetDiskSpaceChange() after processing number of FAT32 entries corresponding to |
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//-- this amount of space in FAT clusters. e.g. after processing amount of FAT32 entries comprising 256MB volume space |
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enum {KVolSpaceNotifyThreshold = 256 * K1MegaByte}; |
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TUint32 iEntriesNotifyThreshold; ///< the value of FAT32 entries need to be counted for CMountCB::SetDiskSpaceChange() call |
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TUint32 iNfyThresholdInc; ///< Threshold increment in FAT32 entries. |
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}; |
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//--------------------------------------------------------------------------------------------------------------------------------------- |
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/** |
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FAT32 Bit supercache populating thread. |
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Represents transient FAT32 helper thread that is populating bit supercache in backgroud. |
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*/ |
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class CFat32BitCachePopulator : public CFat32ScanThread |
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{ |
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public: |
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static CFat32BitCachePopulator* NewL(CAtaFatTable& aOwner); |
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virtual inline TFatHelperThreadType Type() const; |
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private: |
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CFat32BitCachePopulator(CAtaFatTable& aOwner); |
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void RequestFatEntryWriteAccess(TUint32 aFatIndex) const; |
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//-- virtual private interface for the thread function. |
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TInt Thread_Preamble(); |
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TInt Thread_Postamble(TInt aResult); |
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TInt Thread_ProcessCollectedFreeEntries(const CAtaFatTable::TFatScanParam& aFatScanParam); |
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//-- |
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private: |
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friend TInt FAT32_ScanThread(TAny* apHostObject); ///< FAT32 scanner thread function, generic functionality for CFat32ScanThread derived classes |
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enum {KFatChunkBufSize = 16*K1KiloByte}; //-- buffer size for FAT reading |
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TUint32 iTotalOccupiedFatEntries; ///< total counted number of non-free FAT entries |
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}; |
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//--------------------------------------------------------------------------------------------------------------------------------------- |
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#include "fat_table32.inl" |
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#endif //FAT_TABLE_32_H |
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