--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/userlibandfileserver/fileserver/sfat32/inc/sl_scandrv.h	Mon Oct 19 15:55:17 2009 +0100
@@ -0,0 +1,141 @@
+// 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
+
+#include "sl_std.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
+	};
+
+/**
+Scan drive class performs scan drive functionality on all types
+of fat volume.
+*/
+class CScanDrive : public CBase
+	{
+public:
+	/**
+	Error type found by scan drive, only a single error should occur in 
+	any scan of the volume
+	*/
+	enum TDirError{EScanMatchingEntry=1,EScanPartEntry, ETruncation};
+
+public:
+
+	~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 ReadMediaFatL();
+    void DoParseFatL();
+    void DoParseFat32L();
+    void DoParseFat32Buf(const TPtrC8& aBuf, TUint32& aCurrFatEntry);
+
+	TBool AlreadyUsedL(TUint aCluster) const;
+	void SetUsedL(TUint aCluster);
+
+	TUint32 ReadFatL(TInt aClusterNum) const;
+	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,TUint 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 MoveToNextEntryL(TEntryPos& aPos);
+	void ReadDirEntryL(const TEntryPos& aPos,TFatDirEntry& aDirEntry);
+
+    void IndicateErrorsFound();
+
+private:
+	CFatMountCB*            iMount;             ///< The owning Fat mount
+	TPartVFatEntry          iPartEntry;         ///< Storage for a partial VFat entry set error
+	TMatchingStartCluster   iMatching;          ///< Storage for Matching start cluster error
+	TDirError               iDirError;          ///< Indicates the error tpye found also used to indicate if an error has occured
+	TInt                    iDirsChecked;       ///< Count of the number of directories checked
+	TInt                    iRecursiveDepth;    ///< Depth of recursion the scan has reached
+	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
+	TInt                    iListArrayIndex;    ///< Current position into cluster list array
+	TInt                    iTruncationCluster; ///< Cluster at which cluster chain truncation should take place, used for truncation errors
+	
+    TBool                   iFoundProblems; ///< if ETrue after finish, it means that there where some problems FS structure and they were probably fixed;
+    RBitVector              iMediaFatBits;  ///< Storage for bit packed Fat read from media 
+    RBitVector              iScanFatBits;   ///< Storage for bit packed Fat built up by the scan
+
+	};
+
+
+
+#endif //SL_SCANDRV_H
+
+