userlibandfileserver/fileserver/sfat/inc/sl_scandrv.h
author John Imhofe <john.imhofe@nokia.com>
Mon, 21 Dec 2009 16:14:42 +0000
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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\sl_scandrv.h
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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 '\sfat' component is obsolete and is not being used.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 SL_SCANDRV_H
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#define SL_SCANDRV_H
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//---------------------------------------------------------------------------------------------------------------------------------
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const TInt KMaxMatchingEntries      = 2;        ///< Maximum number of matching directory entries scan drive can fix. Any more indicates a fault in the file system
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const TInt KMaxArrayDepth           = 6;        ///< Maximum array depth for cluster storage when KMaxScanDepth is reached
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//---------------------------------------------------------------------------------------------------------------------------------
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/**
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Data structure used to store the location of a partial VFat entry
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*/
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struct TPartVFatEntry
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    {
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    TEntryPos    iEntryPos; ///< The position of the partial VFat entry
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    TFatDirEntry iEntry;    ///< The Dos entry The VFat entries belong with
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    };
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//---------------------------------------------------------------------------------------------------------------------------------
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/**
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Data structure used to store the locations of entries with matching
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start cluster numbers. 
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*/
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struct TMatchingStartCluster
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    {
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    TEntryPos   iEntries[KMaxMatchingEntries]; ///< The positions of the matching entries
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    TInt        iCount;         ///< Count of matching entries
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    TInt        iStartCluster;  ///< The matching cluster number found in more than one entry
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    };
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//---------------------------------------------------------------------------------------------------------------------------------
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class CCheckFatTable : public CBase
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    {
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    static CCheckFatTable* NewL(CFatMountCB* aOwner);
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    CCheckFatTable(CFatMountCB* aOwner);
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    ~CCheckFatTable();
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    void InitializeL();
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    TBool FlushL();
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    TBool GetNextClusterL(TInt& aCluster) const;
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    void WriteFatEntryEofFL(TInt aCluster);
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    TInt ReadL(TInt aFatIndex) const;
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    void WriteL(TInt aFatIndex,TInt aValue);
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private:
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    void WriteMediaDescriptor();
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    TInt PosInBytes(TInt aFatIndex) const;
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    TInt PosInIndex(TInt aBytePos) const;
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    inline TBool IsEof16Bit(TInt aCluster) const;
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    inline TBool IsEof12Bit(TInt aCluster) const;
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    inline TInt MaxFatIndex() const;
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protected:
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    TInt iMaxFatIndex;
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    TUint8* iCheckFat;
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    CFatMountCB* iOwner;
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    };
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//---------------------------------------------------------------------------------------------------------------------------------
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/**
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Scan drive class performs scan drive functionality on all types
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of fat volume.
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*/
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class CScanDrive : public CBase
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    {
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    enum TDirError{EScanMatchingEntry=1,EScanPartEntry};
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    CScanDrive();
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    ~CScanDrive();
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    static CScanDrive* NewL(CFatMountCB* aMount);
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    void ConstructL(CFatMountCB* aMount);
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    TInt StartL();
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    TBool ProblemsDiscovered() const;  
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private:
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#if defined(DEBUG_SCANDRIVE)
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    void PrintErrors();
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    void CompareFatsL() const;
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#endif
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    void FixupDirErrorL();
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    void FindSameStartClusterL();
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    TInt FindStartClusterL(TInt aDirCluster);
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    void CheckDirStructureL();
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    void CheckDirL(TInt aCluster);
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    void ProcessEntryL(const TFatDirEntry& aEntry);
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    TInt CheckEntryClusterL(const TFatDirEntry& aEntry, const TEntryPos& aEntryPos);
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    void WriteClusterChainL(TInt aCluster,TInt aSizeInBytes);
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    TBool MoveToVFatEndL(TEntryPos& aPos,TFatDirEntry& aEntry,TInt& aDirLength);
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    TBool IsValidVFatEntry(const TFatDirEntry& aEntry,TInt prevNum)const;
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    TBool IsDosEntry(const TFatDirEntry& aEntry)const;
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    void AddPartialVFatL(const TEntryPos& aStartPos, const TFatDirEntry& aEntry);
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    TBool AddMatchingEntryL(const TEntryPos& aEntryPos);
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    TInt GetReservedidL(const TEntryPos aVFatPos);
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    void WriteNewFatsL();
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    void FixPartEntryL();
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    void FixMatchingEntryL();
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    void MovePastEntriesL(TEntryPos& aEntryPos,TFatDirEntry& aEntry,TInt aToMove,TInt& aDirEntries);
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    void AddToClusterListL(TInt aCluster);
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    inline TBool AlreadyExistsL(TInt aCluster)const;
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    inline TBool IsEndOfRootDir(const TEntryPos& aPos)const;
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    inline TBool IsEofF(TInt aVal)const;
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    inline TBool IsDirError()const;
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    void IndicateErrorsFound();
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private:
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    CFatMountCB*        iMount;
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    CCheckFatTable*     iNewFat;
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    TPartVFatEntry      iPartEntry;
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    TMatchingStartCluster iMatching;
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    TDirError           iDirError;
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    TInt                iDirsChecked;
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    TInt                iRecursiveDepth;
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    RArray<TInt>*       iClusterListArray[KMaxArrayDepth];
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    TInt                iListArrayIndex;
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    TBool               iFoundProblems; ///< if ETrue after finish, it means that there where some problems FS structure and they were probably fixed;
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    };
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#endif //SL_SCANDRV_H
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