/** @file

* Copyright (c) 2005-2006 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:  Parses chunked-encoding content.

*

*/

#ifndef C_CUPNPHTTPCHUNKPARSER_H

#define C_CUPNPHTTPCHUNKPARSER_H

// INCLUDES

#include <e32base.h>

#include <f32file.h>

// FORWARD DECLARATIONS

// CONSTANTS

/**

 *  CUpnpHttpChunkParser:

 *	Parses chunked-encoding content.

 *  @lib dlnawebserver.lib

 *  @since S60 3.2

 */

NONSHARABLE_CLASS (CUpnpHttpChunkParser) : public CBase

		{

public: 

	//possible values of the context

    enum TChunkContext

        {

        EUnknown=0,

        EHeader,        

        EBody,

        ELastChunk,

        EExtension,

        ETrailer,

        EEndChunkBody,

        EError,

        EFinish,

        };

	// Constructor and destructor

    /**

    * Constructor function.

    * @since Series60 3.2 

    * @return A new CUpnpHttpChunkParser instance

    **/

    static CUpnpHttpChunkParser* NewL();

    /**

    * Virtual destructor function.

    * @since Series60 3.2 

    **/

    virtual ~CUpnpHttpChunkParser();

     /**

     * Parse - decodes chunked-encoding     

     * @since S60 3.2

     * @param buffer

     * @param position in the buffer

     * @return error code

     */

    TInt Parse(TDes8& aBuffer,TInt& aPos);

    /**

     * SetErrorState - set error state

     * @since S60 3.2          

     */

    void SetErrorState();

	/**

     * IsFinished - if decoding finished    

     * @since S60 3.2     

     * @return TBool

     */	

	TBool IsFinished();

	/**

     * Reset - resets parser for new decoding

     * @since S60 3.2          

     */

	void Reset();

protected: // Constructors

    /**

    * First phase constructor.

    * @param aSession Handle to session that owns CUpnpChunkFileTransferBuffer instance.

    * @param aToBeSaveInFile Should content be saved to the file.

    **/

    CUpnpHttpChunkParser();

    /**

    * By default Symbian 2nd phase constructor is private

    */

    void ConstructL();

private:

   	/**

     * ParseBody - decodes chunk-body     

     * @since S60 3.2

     * @param buffer

     * @param position in the buffer

     * @return ETrue if all data parsed

     */

    TBool ParseBody(TDes8& aBuffer,TInt& aPos);

    /**

     * ParseHeader - decodes chunk-header    

     * @since S60 3.2

     * @param buffer

     * @param position in the buffer

     * @return ETrue if all data parsed

     */

    TBool ParseHeader(TDes8& aBuffer,TInt& aPos);

    /**

     * ParseExtension - decodes chunk-extension     

     * @since S60 3.2

     * @param buffer

     * @param position in the buffer

     * @return ETrue if all data parsed

     */

    TBool ParseExtension(TDes8& aBuffer,TInt& aPos);

    /**

     * ParseTrailer - decodes chunk-trailer    

     * @since S60 3.2

     * @param buffer

     * @param position in the buffer

     * @return ETrue if all data parsed

     */

    TBool ParseTrailer(TDes8& aBuffer,TInt& aPos);

    /**

     * ParseLastChunk - decodes last chunk     

     * @since S60 3.2

     * @param buffer

     * @param position in the buffer

     * @return ETrue if all data parsed

     */

    TBool ParseLastChunk(TDes8& aBuffer,TInt& aPos);

    /**

     * IsEmpty - checks if any data left     

     * @since S60 3.2

     * @param buffer

     * @param position in the buffer

     * @return ETrue if no data left

     */

    TBool IsEmpty(TDes8& aBuffer,TInt aPos);        

protected: 

    //Context of the parser

    TChunkContext iContext;

    //size of the current chunk

    TInt iChunkSize;

	//error in parsing    

    TInt iError;

    //already appended bytes of the current chunk

    TInt iBytesAppended;        

	};

#endif // C_CUPNPHTTPCHUNKPARSER_H

// End Of File