webengine/osswebengine/cache/inc/HttpCacheStreamHandler.h
author Kiiskinen Klaus (Nokia-D-MSW/Tampere) <klaus.kiiskinen@nokia.com>
Mon, 30 Mar 2009 12:54:55 +0300
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/*
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* Copyright (c) 2006 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:  Definition of CHttpCacheStreamHandler  
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*
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*/
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#ifndef CHTTPCACHESTREAMHANDLER_H
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#define CHTTPCACHESTREAMHANDLER_H
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//  INCLUDES
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#include <e32base.h>
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#include <f32file.h>
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#include <s32file.h>
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// CONSTANTS
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// MACROS
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// DATA TYPES
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// FUNCTION PROTOTYPES
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// FORWARD DECLARATIONS
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class CHttpCacheEntry;
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class RFileWriteStream;
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class RFileReadStream;
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// CLASS DECLARATION
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/**
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*
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*  @lib
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*  @since 3.1
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*/
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class CHttpCacheStreamEntry : public CBase
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    {
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    public:  // Constructors and destructor
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        /**
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        * Two-phased constructor.
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        * @since 3.1
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        * @param
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        * @param
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        * @return CHttpCacheStreamEntry object.
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        */
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        static CHttpCacheStreamEntry* NewL( RFs& aRfs, CHttpCacheEntry& aHttpCacheEntry, TDriveUnit aDrive,
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            TInt64 aCriticalLevel );
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        /**
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        * Destructor.
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        */
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        virtual ~CHttpCacheStreamEntry();
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    public: // new functions
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        inline CHttpCacheEntry* CacheEntry() const { return iHttpCacheEntry; }
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        void Erase();
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        HBufC8* HeadersL();
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        HBufC8* NextChunkL( TBool& aLastChunk );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TInt SaveHeaders( const TDesC8& aHeaderStr );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        void RemoveHeaders();
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TInt SaveBodyData( const TDesC8& aBodyStr );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        void RemoveBodyData();
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        /**
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        * Flush
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TInt Flush();
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    private:
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        /**
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        * Construct.
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        * @since 3.1
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        * @param
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        * @param
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        * @return CHttpCacheStreamEntry object.
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        */
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        CHttpCacheStreamEntry( RFs& aRfs, CHttpCacheEntry& aHttpCacheEntry, TDriveUnit aDrive,
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            TInt64 aCriticalLevel );
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        /**
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        * By default Symbian 2nd phase constructor is private.
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        */
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        void ConstructL();
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    private: //
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        void GetHeaderFileName( const TFileName& aBodyFileName, TFileName& aHeaderFileName );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TBool OpenCacheFiles();
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TBool CreateNewFilesL();
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        void BodyFileName( TFileName& aBodyFileName );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TBool DiskSpaceBelowCriticalLevel( TInt aContentSize );
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    private:    // Data
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        //
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        TBool               iFileOk;
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        //
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        RFs                 iRfs;       // not owned
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        //
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        RFile               iHeaderFile;      // owned
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        //
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        RFile               iBodyFile;      // owned
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        //
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        CHttpCacheEntry*    iHttpCacheEntry; // not owned
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        //
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        TDriveUnit          iDrive;
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        //
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        TInt64              iCriticalLevel;
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        //
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        HBufC8*             iCacheBuffer;   // owned
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    };
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/**
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*
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*  @lib
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*  @since 3.1
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*/
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class CHttpCacheStreamHandler : public CBase
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    {
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    public:  // Constructors and destructor
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        /**
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        * Two-phased constructor.
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        * @since 3.1
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        * @param
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        * @param
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        * @return CHttpCacheStreamHandler object.
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        */
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        static CHttpCacheStreamHandler* NewL( const TDesC& aDirectory, TInt aCriticalLevel );
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        /**
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        * Destructor.
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        */
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        virtual ~CHttpCacheStreamHandler();
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    public: // new functions
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        inline TInt SavedContentSize() const { return iContentSize; }
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TBool AttachL( CHttpCacheEntry& aCacheEntry );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        void Detach( const CHttpCacheEntry& aCacheEntry );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        void Erase( const CHttpCacheEntry& aCacheEntry );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        HBufC8* HeadersL( CHttpCacheEntry& aCacheEntry );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        HBufC8* NextChunkL( CHttpCacheEntry& aCacheEntry, TBool& aLastChunk );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TBool SaveHeaders( CHttpCacheEntry& aCacheEntry, const TDesC8& aHeaderStr );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        void RemoveHeaders( CHttpCacheEntry& aCacheEntry );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TBool SaveBodyData( CHttpCacheEntry& aCacheEntry, const TDesC8& aBodyStr );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        void RemoveBodyData( CHttpCacheEntry& aCacheEntry );
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        /**
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        * Flush
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TBool Flush( CHttpCacheEntry& aCacheEntry );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        inline void SetStartupCacheSize( TInt aContentSize ) { iContentSize = aContentSize; }
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#ifdef _DEBUG
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        inline TBool Find( const CHttpCacheEntry& aCacheEntry ) { return ( FindStreamEntry( aCacheEntry ) != NULL );  }
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#endif // _DEBUG
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    private:
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        /**
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        * Construct.
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        * @since 3.1
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        * @param
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        * @param
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        * @return CacheHandler object.
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        */
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        CHttpCacheStreamHandler();
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        /**
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        * By default Symbian 2nd phase constructor is private.
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        */
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        void ConstructL( const TDesC& aDirectory, TInt aCriticalLevel );
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    private:
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   365
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        /**
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        *
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        * @since 3.1
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        * @param
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parents:
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        * @return
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parents:
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        */
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   372
        CHttpCacheStreamEntry* FindStreamEntry( const CHttpCacheEntry& aCacheEntry, TInt* aIndex = NULL );
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    private:    // Data
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   377
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        //
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        RFs                                         iRfs;               // owned
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        // attached entries
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        CArrayPtrFlat<CHttpCacheStreamEntry>*       iActiveEntries;     // owned
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        //
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        TInt                                        iContentSize;
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        //
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        TDriveUnit          iDrive;
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        //
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        TInt64              iCriticalLevel;
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        //
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        TInt                iDiskFull;
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    };
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#endif      // CHTTPCACHESTREAMHANDLER_H
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// End of File