--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/userlibandfileserver/fileserver/sfat/inc/sl_scandrv.h	Mon Oct 19 15:55:17 2009 +0100
@@ -0,0 +1,154 @@
+// Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of the License "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+// f32\sfat\inc\sl_scandrv.h
+// 
+//
+
+/**
+ @file
+ @internalTechnology
+*/
+
+#ifndef SL_SCANDRV_H
+#define SL_SCANDRV_H
+
+//---------------------------------------------------------------------------------------------------------------------------------
+
+const TInt KMaxMatchingEntries		= 2;        ///< Maximum number of matching directory entries scan drive can fix. Any more indicates a fault in the file system
+const TInt KMaxArrayDepth			= 6;        ///< Maximum array depth for cluster storage when KMaxScanDepth is reached
+
+//---------------------------------------------------------------------------------------------------------------------------------
+
+/**
+Data structure used to store the location of a partial VFat entry
+*/
+struct TPartVFatEntry
+	{
+	TEntryPos    iEntryPos; ///< The position of the partial VFat entry
+	TFatDirEntry iEntry;    ///< The Dos entry The VFat entries belong with
+	};
+
+//---------------------------------------------------------------------------------------------------------------------------------
+
+/**
+Data structure used to store the locations of entries with matching
+start cluster numbers. 
+*/
+struct TMatchingStartCluster
+	{
+	TEntryPos   iEntries[KMaxMatchingEntries]; ///< The positions of the matching entries
+	TInt        iCount;         ///< Count of matching entries
+	TInt        iStartCluster;  ///< The matching cluster number found in more than one entry
+	};
+
+
+//---------------------------------------------------------------------------------------------------------------------------------
+
+class CCheckFatTable : public CBase
+	{
+public:
+	static CCheckFatTable* NewL(CFatMountCB* aOwner);
+	CCheckFatTable(CFatMountCB* aOwner);
+	~CCheckFatTable();
+	void InitializeL();
+	TBool FlushL();
+	TBool GetNextClusterL(TInt& aCluster) const;
+	void WriteFatEntryEofFL(TInt aCluster);
+	TInt ReadL(TInt aFatIndex) const;
+	void WriteL(TInt aFatIndex,TInt aValue);
+private:
+	void WriteMediaDescriptor();
+	TInt PosInBytes(TInt aFatIndex) const;
+	TInt PosInIndex(TInt aBytePos) const;
+	inline TBool IsEof16Bit(TInt aCluster) const;
+	inline TBool IsEof12Bit(TInt aCluster) const;
+    inline TInt MaxFatIndex() const;
+protected:
+    TInt iMaxFatIndex;
+	TUint8* iCheckFat;
+	CFatMountCB* iOwner;
+	};
+
+
+//---------------------------------------------------------------------------------------------------------------------------------
+
+/**
+Scan drive class performs scan drive functionality on all types
+of fat volume.
+*/
+class CScanDrive : public CBase
+	{
+public:
+	enum TDirError{EScanMatchingEntry=1,EScanPartEntry};
+public:
+	CScanDrive();
+	~CScanDrive();
+	static CScanDrive* NewL(CFatMountCB* aMount);
+	void ConstructL(CFatMountCB* aMount);
+	TInt StartL();
+    TBool ProblemsDiscovered() const;  
+
+
+private:
+
+#if defined(DEBUG_SCANDRIVE)
+	void PrintErrors();
+	void CompareFatsL() const;
+#endif
+
+	void FixupDirErrorL();
+	void FindSameStartClusterL();
+	TInt FindStartClusterL(TInt aDirCluster);
+	void CheckDirStructureL();
+	void CheckDirL(TInt aCluster);
+	void ProcessEntryL(const TFatDirEntry& aEntry);
+	TInt CheckEntryClusterL(const TFatDirEntry& aEntry, const TEntryPos& aEntryPos);
+	void WriteClusterChainL(TInt aCluster,TInt aSizeInBytes);
+	TBool MoveToVFatEndL(TEntryPos& aPos,TFatDirEntry& aEntry,TInt& aDirLength);
+	TBool IsValidVFatEntry(const TFatDirEntry& aEntry,TInt prevNum)const;
+	TBool IsDosEntry(const TFatDirEntry& aEntry)const;
+	void AddPartialVFatL(const TEntryPos& aStartPos, const TFatDirEntry& aEntry);
+	TBool AddMatchingEntryL(const TEntryPos& aEntryPos);
+	TInt GetReservedidL(const TEntryPos aVFatPos);
+	void WriteNewFatsL();
+	void FixPartEntryL();
+	void FixMatchingEntryL();
+	void MovePastEntriesL(TEntryPos& aEntryPos,TFatDirEntry& aEntry,TInt aToMove,TInt& aDirEntries);
+	void AddToClusterListL(TInt aCluster);
+	inline TBool AlreadyExistsL(TInt aCluster)const;
+	inline TBool IsEndOfRootDir(const TEntryPos& aPos)const;
+	inline TBool IsEofF(TInt aVal)const;
+	inline TBool IsDirError()const;
+    void IndicateErrorsFound();
+
+private:
+	CFatMountCB*        iMount;
+	CCheckFatTable*     iNewFat;
+	TPartVFatEntry      iPartEntry;
+	TMatchingStartCluster iMatching;
+	TDirError           iDirError;
+	TInt                iDirsChecked;
+	TInt                iRecursiveDepth;
+	RArray<TInt>*       iClusterListArray[KMaxArrayDepth];
+	TInt                iListArrayIndex;
+    TBool               iFoundProblems; ///< if ETrue after finish, it means that there where some problems FS structure and they were probably fixed;
+	};
+
+
+
+
+
+#endif //SL_SCANDRV_H
+
+