--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/userlibandfileserver/fileserver/sfile/sf_cache_client.h	Thu Dec 17 09:24:54 2009 +0200
@@ -0,0 +1,112 @@
+// Copyright (c) 2006-2009 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\sfile\sf_cache_client.h
+// 
+//
+
+/**
+ @file
+ @internalTechnology
+ @released
+*/
+
+#if !defined(__SF_CACHE_CLIENT_H__)
+#define __SF_CACHE_CLIENT_H__
+
+#include "sf_cache_man.h"
+
+// fwd refs
+class CCacheManager;	
+
+NONSHARABLE_CLASS(CCacheClient) : public CBase
+	{
+public:
+	~CCacheClient();
+	void Purge(TBool aPurgeDirty = EFalse);
+
+	TUint8* AllocateAndLockSegments(TInt64 aPos, TInt& aSegmentCount, TBool aMakeDirty, TBool aExtendExisting);
+
+	TUint8* FindAndLockSegments(TInt64 aPos, TInt& aSegmentCount, TInt& aFilledSegmentCount, TInt& aLockError, TBool aMakeDirty);
+	TUint8* FindSegment(TInt64 aPos);
+	
+
+	void UnlockSegments(TInt64 aPos);
+
+
+	void MarkSegmentsAsFilled(TInt64 aPos, TInt aSegmentCount);
+	void MarkSegmentsAsDirty(TInt64 aPos, TInt aSegmentCount);
+
+	TInt FindFirstDirtySegment(TInt64& aPos, TUint8*& aAddr);
+
+	void MarkSegmentsAsClean(TInt64 aPos);
+
+	
+	void SetMaxSegments(TInt aMaxSegments);
+
+	TBool SegmentEmpty(TInt64 aPos);
+	TBool SegmentDirty(TInt64 aPos);
+	TBool TooManyLockedSegments();
+
+	inline TInt CacheOffset(TInt64 aLinAddr) const \
+		{return(I64LOW(aLinAddr)& ((1 << iManager.SegmentSizeLog2())-1));}
+
+	TInt SegmentSize();
+	TInt SegmentSizeLog2();
+	TInt64 SegmentSizeMask();
+	TInt CacheLineSize();
+	TInt CacheLineSizeInSegments();
+
+#if defined(_DEBUG) || defined(_DEBUG_RELEASE)
+	void DumpCache();
+#endif
+
+private:
+	// class can only be instantiated from friend class CCacheManager
+	static CCacheClient* NewL(CCacheManager& aManager);
+	void ConstructL();
+	CCacheClient(CCacheManager& aManager);
+	
+
+	TInt LockSegments(TInt64 aPos, TInt aSegmentCount, TBool aMakeDirty);
+
+	const CCacheManager::TCacheLine* FindCacheLine(TInt64 aPos);
+	TInt FindCacheLineIndex(TInt64 aPos);
+
+	TBool FreeCacheLine(const CCacheManager::TCacheLine* aCacheLine);
+
+	void RemoveCacheLine(const CCacheManager::TCacheLine* aCacheLine);
+	void RemoveEmptySegments(const CCacheManager::TCacheLine* aCacheLine);
+
+	void RemoveLru(const CCacheManager::TCacheLine* aCacheLineToExclude);
+
+	inline TInt StartSegment(const CCacheManager::TCacheLine* aCacheLine, TInt64 aPos);
+	inline TInt CacheLineLen(const CCacheManager::TCacheLine* aCacheLine);
+
+	TInt CachedBytes();
+	TInt LockedBytes();
+private:
+	CCacheManager& iManager;
+
+	// segment array for segments that contain valid data
+	RPointerArray<CCacheManager::TCacheLine>* iCacheLines;
+	TInt iMaxBytesCached;
+
+	TInt iLastCacheLineIndex;
+
+	friend class CCacheManager;
+	};
+
+
+
+#endif