--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/fbs/fontandbitmapserver/inc/FBSMBMC.H	Tue Feb 02 01:47:50 2010 +0200
@@ -0,0 +1,89 @@
+// Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of "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:
+// This file holds the class declarations for the CFbTopMBMCache 
+// The cache is used to store the stream ids of bitmaps in a MBM file
+// 
+//
+
+#ifndef __FBSMBMC_H__
+#define __FBSMBMC_H__
+
+#include <e32std.h>
+#include <e32base.h>
+#include <s32std.h>
+#include "ShiftedFileStore.h"
+
+
+//This class holds the TStreamIds of the bitmaps stored in an MBM file
+//and the filestore of the last loaded bitmap file. The idea of the cache
+//is to speed up loading of bitmaps from a mbm file by skipping the file
+//opening process and mapping the MBM id directly to the Stream ids stored
+//in the cache
+//
+NONSHARABLE_CLASS(CFbTopStreamIdCache): public CBase
+	{
+public:
+	CFbTopStreamIdCache(TInt aForwardSize, TInt aBackwardSize, TInt aMaxFilestores);
+	~CFbTopStreamIdCache();
+	TStreamId GetStreamIdL(RFile& aFile,const TDesC& aFilename,TInt32 aId,TUint aFileOffset, TInt aSessionHandle);
+	TStreamId GetStreamIdL(RFs& aFs,const TDesC& aFilename,TInt32 aId,TUint aFileOffset, TInt aSessionHandle);
+	CShiftedFileStore* MruFileStore();
+	void FlushCache();
+	void CloseFileStores(TInt aSessionHandle=0);	// If aSessionHandle is not passed, all file stores will be closed
+
+private:
+	class RCacheEntry;
+	RCacheEntry* AddCacheEntryL(const TDesC& aFilename, TUint aFileOffset);
+	RCacheEntry* FindCacheEntry(const TDesC& aFilename, TUint aFileOffset);
+
+private:
+	RPointerArray<RCacheEntry> iEntries;	// Array of pointers to the cache entries in least-recently-used order
+	TUint8* iBuffer;						// Buffer for storage of the cache entries
+	const TInt iForwardCacheSize;			// Max number of cached bitmap ids after the last requested bitmap id
+	const TInt iBackwardCacheSize;			// Max number of cached bitmap ids before the last requested bitmap id
+	const TInt iMaxCacheFilestores;			// Max number of filestores in the cache
+
+	friend class CTStreamIdCache;			// This is used for testing purposes
+	};
+
+
+class CFbTopStreamIdCache::RCacheEntry
+	{
+public:
+	RCacheEntry(const TDesC& aFilename, TUint aFileOffset);
+	TBool SameFile(const TDesC& aFilename, TUint aFileOffset);
+	TStreamId GetStreamIdL(TInt32 aId, TInt aForwardSize, TInt aBackwardSize);
+	CShiftedFileStore* FileStore();
+	void CloseFileStore();
+	TInt SessionHandle() const;
+	void CreateFileStoreL(RFile& aFile, TInt aSessionHandle);
+	void CreateFileStoreL(RFs& aFs, const TDesC& aFilename, TInt aSessionHandle);
+public:
+	static const TInt KBaseSize;		// Size of the class excluding array iStreamIdCache
+
+private:
+	TBufC<KMaxFileName>	iFilename;		// Name of the mbm file
+	TUint iFileOffset;					// Offset into the mbm file
+	CShiftedFileStore *iFilestore;		// File store for the mbm file
+	TInt iLastId;						// Last requested bitmap id from the mbm file
+	TInt iStreamIdCount;				// Number of stream ids from the mbm file
+	TInt iSessionHandle;				// Handle to the associated client session
+
+	// Keep always iStreamIdCache as the last data member
+	// Memory for it is allocated in CFbTopStreamIdCache::AddCacheEntryL()
+	TStreamId iStreamIdCache[1];		// Array of stream ids from the mbm file
+
+	friend class CTStreamIdCache;		// This is used for testing purposes
+	};
+#endif