codhandler/codeng/inc/CodBuffStorage.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:  Implements double buffering storage functionality for OMA downloads
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*
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*/
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#ifndef COD_BUFFSTORAGE_H
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#define COD_BUFFSTORAGE_H
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//  INCLUDES
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#include <e32base.h>
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// FORWARD DECLARATIONS
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class CFileSaver;
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// CLASS DECLARATION
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/**
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*  ?one_line_short_description.
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*  ?other_description_lines
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*
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*  @lib ?library
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*  @since Series 60 v2.8
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*/
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NONSHARABLE_CLASS( CCodBuffStorage ) : public CActive
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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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     */
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    static CCodBuffStorage* NewL( CFileSaver* aStorage );
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   /**
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    * Destructor.
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    */
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    ~CCodBuffStorage();
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    public: // Interface
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    /**
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    * Delets the storage buffers.
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    * @param 
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    * @return
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    */
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    void ResetBuffers();
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   /**
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    * Persist received chunk
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    * @since Series 60 v2.8
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    * @param aBuf new chunk to be added
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    * @return EFalse if content-length had to be updated.
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    */
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    TBool WriteOutNextBodyDataL( const TDesC8& aBuf );
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    /**
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    * If buffering enabled, flush data to disk
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    */
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    void FlushBuffersL();
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    /**
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    * Returns buffer size
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    * @since Series 60 v2.8
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    * @param 
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    * @return  Buffer size.
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    */
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    const TInt& CurrentBufferSize() { return iBufferSize; }
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    /**
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    * Clear the error encountered during writing to file
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    * @since Series 60 v2.8
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    * @param 
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    * @return  Buffer size.
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    */
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    void ClearErrors() { iLastWriteErrorCode = KErrNone; }
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    protected:  // Functions from base classes
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    private: // From CActive
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    /**
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    * Cancels the timer.
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    * @param 
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    * @return
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    */
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    void DoCancel();
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    /**
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    * Handles an active object’s request completion event.
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    * @param 
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    * @return
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    */
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    void RunL();
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    /**
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    * Persist received chunk
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    * @since Series 60 v2.8
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    * @param aBuf new chunk to be added
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    * @return EFalse if content-length had to be updated.
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    */
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    void DoBufferingWriteL(const TDesC8& aBuf);
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    //void DoNonbufferingWriteL(const TDesC8& aBuf);
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    private:              
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    /**
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     * C++ default constructor.
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     */
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    CCodBuffStorage(CFileSaver*);
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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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    public:     // Data
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    protected:  // Data
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    private:
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    // Double-buffering
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    HBufC8* iBuff1, *iBuff2;
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    HBufC8* iClientBuffer;
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    TPtr8 *iWritePtr;
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    TInt iBufferSize;
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    // For stalling condition handling
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    TInt iLastWriteErrorCode;
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    CActiveSchedulerWait iWait;
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    // References to CFileSaver data
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    RFile* iFile;
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    TInt& iDownloadedSize; // How much data actually written to finally
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    TInt32& iBufferedSize;   // How much data received over the air (but not necessarily all in file yet)
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    TInt32& iHttpStorageBufferSize; //Storage buffer size 128kb(Non-progressive)/16kb(Progressive)
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    TInt32& iHttpStorageLength;     //Content Length
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    TBool& iProgressiveDownload;    //Flag to indicate Progressive play
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    };
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#endif      // COD_BUFFSTORAGE_H   
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// End of File