author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 18 Jan 2010 21:31:10 +0200 | |
changeset 11 | 329ab0095843 |
parent 9 | 96e5fb8b040d |
child 22 | 2f92ad2dc5db |
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\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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#ifndef SL_SCANDRV_H |
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#define SL_SCANDRV_H |
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#include "sl_std.h" |
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//--------------------------------------------------------------------------------------------------------------------------------- |
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const TUint 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 TUint KMaxArrayDepth = 6; ///< Maximum array depth for cluster storage when KMaxScanDepth is reached |
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/** Data structure used to store the location of a partial VFat entry */ |
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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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/** Data structure used to store the locations of entries with matching start cluster numbers. */ |
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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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TUint iCount; ///< Count of matching entries |
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TUint iStartCluster; ///< The matching cluster number found in more than one entry |
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}; |
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//--------------------------------------------------------------------------------------------------------------------------------- |
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/** |
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This class is used for checking volume for FS errors and fixing a limited set of FS artefacts introduced by Rugged FAT on write failures. |
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It can operate in 2 modes: |
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1. "ScanDrive" mode, scan whole volume for possible Rugged FAT artefacts and fix them if possible. |
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1.1 If there was no problem at all, then StartL() finishes normally and ProblemsDiscovered() returns ENoErrors. |
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1.2 If there was Rugged FAT artefact and it had been successfully fixed, StartL() finishes normally and ProblemsDiscovered() returns EScanDriveDirError. |
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In this case the client may perform volum remounting, because FAT is very likely to have been changed. |
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1.3 If there was a fatal error, like media failure or unfixable FS problem, StartL() will leave with some generic error code. |
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2. "CheckDisk" mode. check file system for known artefacts and return an error if _any_ problem discovered. |
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In this case StartL() _may_ leave with something like KErrCorrupt if there was a media failure or scan has stumbled across unknown FS error, |
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ProblemsDiscovered() _may_ return some code describing the problem. If StartL() did not leave, but ProblemsDiscovered() returns a code different |
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from ENoErrors, this means that there is FS corruption. |
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*/ |
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class CScanDrive : public CBase |
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{ |
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public: |
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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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public: |
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/** description of known problems that this scanned can deal with. Mostly used in "CheckDisk " mode */ |
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enum TGenericError |
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{ |
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ENoErrors = 0, ///< 0 no errors discovered |
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EBadClusterNumber, ///< 1 cluster number that doesn't correspond to the max. amount of clusters on the volume |
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EClusterAlreadyInUse, ///< 2 cross-linked cluster chain |
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EBadClusterValue, ///< 3 also means "lost cluster" |
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EInvalidEntrySize, ///< 4 size of file/directory does not correspond to the cluster chain length |
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EUnknownError = 95, ///< unknown error |
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EScanDriveDirError=100 ///< 100 ScanDrive error |
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}; |
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TGenericError ProblemsDiscovered() const; |
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/** CScanDrive mode of operation */ |
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enum TScanDriveMode |
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{ |
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EScanAndFix, ///< "ScanDrive" mode, scan whole volume for possible Rugged FAT artefacts and fix them |
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ECheckDisk, ///< "CheckDisk" mode. check file system for known artefacts and return an error if _any_ problem discovered |
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}; |
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void StartL(TScanDriveMode aMode); |
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private: |
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void PrintErrors(); |
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void CompareFatsL(TBool aStopOnFirstErrorFound) ; |
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void CompareAndFixFatsL(); |
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void FixupDirErrorL(); |
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void ReadMediaFatL(); |
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void DoParseFatL(); |
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void DoParseFat32L(); |
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void DoParseFat32Buf(const TPtrC8& aBuf, TUint32& aCurrFatEntry); |
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TBool IsClusterUsedL(TUint aCluster); |
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void MarkClusterUsedL(TUint aCluster); |
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TUint32 ReadFatL(TUint aClusterNum) ; |
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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(TUint32 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 RecordClusterChainL(TInt aCluster,TUint 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 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 MoveToNextEntryL(TEntryPos& aPos); |
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void ReadDirEntryL(const TEntryPos& aPos,TFatDirEntry& aDirEntry); |
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inline void IndicateErrorsFound(TGenericError aError); |
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inline TUint32 MaxClusters() const; |
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inline TBool CheckDiskMode() const; |
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protected: |
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/** |
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Internal ScanDrive mode specific errors. In Rugged FAT mode (current implementatio) any type of error of this kind can occur only once and it will be fixed. |
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Othersise the FS is considered to be corrupted |
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*/ |
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enum TDirError |
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{ |
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ENoDirError= 0, ///< no errors found |
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EScanMatchingEntry=1, ///< Two entries pointing to the same cluster chain; Rugged FAT rename/replace artefact |
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EScanPartEntry, ///< Deleted DOS entry and orphaned VFAT ones from the same entryset; Rugged FAT 'file/dir delete' artefact |
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}; |
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private: |
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CFatMountCB* iMount; ///< The owning Fat mount |
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TPartVFatEntry iPartEntry; ///< Storage for a partial VFat entry set error, see EScanPartEntry |
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TMatchingStartCluster iMatching; ///< Storage for Matching start cluster error, see EScanMatchingEntry |
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TDirError iDirError; ///< Indicates the error tpye found also used to indicate if an error has occured |
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TInt iDirsChecked; ///< Count of the number of directories checked |
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TInt iRecursiveDepth; ///< Depth of recursion the scan has reached |
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RArray<TInt>* iClusterListArray[KMaxArrayDepth]; ///< Size in bytes of the bit packed Fat Cluster list array used when maximum depth has been reached so that directory may be re-visited. Avoid stack overflow |
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TUint iListArrayIndex; ///< Current position into cluster list array |
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TUint32 iTruncationCluster; ///< Cluster at which cluster chain truncation should take place, used for truncation errors |
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TUint32 iMaxClusters; ///< Max. amount of clusters on the volume |
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RBitVector iMediaFatBits; ///< Storage for bit packed Fat read from media |
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RBitVector iScanFatBits; ///< Storage for bit packed Fat built up by the scan |
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TGenericError iGenericError; ///< FS error that is discovered by scanning in any mode |
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TScanDriveMode iScanDriveMode; ///< mode of operation |
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}; |
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#endif //SL_SCANDRV_H |
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