/*

* Copyright (c) 2006 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:  Implements storage functionality in the DownloadManager

*

*/

#ifndef BUFFSTORAGE_H

#define BUFFSTORAGE_H

//  INCLUDES

#include <e32base.h>

// FORWARD DECLARATIONS

class CHttpDownload;

class CHttpStorage;

class RFotaEngineSession;

class RWriteStream;

class CDocumentHandler;

class CBuffStorage;

// CLASS DECLARATION

/**

*  ?one_line_short_description.

*  ?other_description_lines

*

*  @lib ?library

*  @since Series 60 v2.8

*/

NONSHARABLE_CLASS( CBuffStorage ) : public CBase

    {

    public:  // Constructors and destructor

    /**

     * Two-phased constructor.

     */

    static CBuffStorage* NewL( CHttpStorage* aStorage );

   /**

    * Destructor.

    */

    ~CBuffStorage();

    public: // Interface

    /**

    * Delets the storage buffers.

    * @param 

    * @return

    */

    void ResetBuffers();

	/**

    * Persist received chunk

    * @since Series 60 v2.8

    * @param aBuf new chunk to be added

    * @return EFalse if content-length had to be updated.

    */

    TBool WriteOutNextBodyDataL( const TDesC8& aBuf );

    /**

    * If buffering enabled, flush data to disk

    */

    void FlushBuffersL();

    /**

    * Returns buffer size

    * @since Series 60 v2.8

    * @param 

    * @return  Buffer size.

    */

    const TInt& CurrentBufferSize() { return iBufferSize; }

    /**

    * Clear the error encountered during writing to file

    * @since Series 60 v2.8

    * @param 

    * @return  Buffer size.

    */

    void ClearErrors() { iLastWriteErrorCode = KErrNone; }

    protected:  // Functions from base classes

    private: // From CActive

    void DoBufferingWriteL(const TDesC8& aBuf);

    void DoNonbufferingWriteL(const TDesC8& aBuf);

    private:              

    /**

     * C++ default constructor.

     */

    CBuffStorage(CHttpStorage*);

    /**

     * By default Symbian 2nd phase constructor is private.

     */

    void ConstructL();

	public:     // Data

	friend class CBuffStorage;

    protected:  // Data

    private:

    // Double-buffering

    HBufC8* iBuff1, *iBuff2;

    HBufC8* iClientBuffer;

    TPtr8 *iWritePtr;

    TInt iBufferSize;

    // For stalling condition handling

    TInt iLastWriteErrorCode;

    // References to CHttpStorage data

    RFile*& iFile;

    TInt32& iDownloadedSize; // How much data actually written to finally

    TInt32& iBufferedSize;   // How much data received over the air (but not necessarily all in file yet)

    TInt& iHttpStorageBufferSize;

    TInt32& iHttpStorageLength;

    TBool& iBufferingEnabled;

    TBool& iProgressiveDownload;

#ifdef __SYNCML_DM_FOTA

    RWriteStream*& iFotaStream;

#endif // __SYNCML_DM_FOTA

    };

#endif      // BUFFSTORAGE_H   

// End of File