mmserv/metadatautility/Src/MetaDataBufferAgg.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 01:08:46 +0200
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/*
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* Copyright (c) 2008 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 "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:  Active object for MetadataUtility
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*
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*/
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#ifndef METADATABUFFERAGG_H
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#define METADATABUFFERAGG_H
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// INCLUDES
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#include <e32base.h>
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class CMetaDataUtilityBody;
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class MMDUChunkDataObserver;
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NONSHARABLE_CLASS(CMetaDataBufferAgg): public CActive
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{
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public:
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    /**
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     * Two-phased constructor.
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     * @since 9.1
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     * @param aMimeType The MIME type
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     * @param aObserver should not be NULL
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     * @return A pointer to a new instance of this class
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     */    
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    static CMetaDataBufferAgg* NewL( CMetaDataUtilityBody* aBody,
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                                     TDesC8& aMimeType, 
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                                     MMDUChunkDataObserver& aObserver);
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    /**
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     * Destructor.
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     */
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    virtual ~CMetaDataBufferAgg();
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    /** 
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    * Process the chunk data.
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    * @since 5.1
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    *      Max size of buffer passed in is N bytes for performance optimization
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    *      Buffer overflow (out of memory) results in callback with error.
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    *      invalid chunk data results in callback with error
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    *      parsing APIs are invoked before callback is received results in 0 count or empty container
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    *      parsing APIs are invoked after callback is received results in positive count and full container
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    * @param aChunk the data chunk to be processed
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    * @return error value
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    *       KErrNone
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    *       KErrNotReady
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    */
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    TInt RequestProcessChunkData( TDesC8& aChunk, TBool aFinalChunk );    
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    /** 
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    * Parse the chunk data.
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    * @since 5.1
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    *      parsing APIs are invoked before callback is received results in 0 count or empty container
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    *      parsing APIs are invoked after callback is received results in positive count and full container
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    * @return error value
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    *       KErrNone
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    *       KErrNotReady
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    */
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    TInt RequestParseChunkData();    
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    void ReadyToGo();
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    /**
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     * Do Cancel
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     * @since 9.1
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     */    
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    void DoCancel();
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    /**
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     * Run for Active Object
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     * @since 9.1
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     */        
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	void RunL();
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private:
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private:
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    enum TAggregateState 
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        { 
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        EFindIdentifier,
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        ECalculateSize,
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        ECollectData,
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        EParseData,
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        EParseComplete
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        };
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    void ConstructL(const TDesC8& aMimeType );
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    CMetaDataBufferAgg( CMetaDataUtilityBody* aBody, 
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                        MMDUChunkDataObserver& aObserver );
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    void FindMetaDataIdentifierL( TDesC8* aBuf );
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    void CalculateMetaDataSizeL( TDesC8* aBuf );
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    void ComputeSize( TDesC8* aBuf, TInt aOffset );
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    void CollectMetaDataL( TDesC8* aBuf );
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    void ProcessPreviousChunkL( TDesC8* aBuf );
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    void DoCallback( TInt aError );
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    void CopyBufferL(RBuf8* aDes, TUint8* aPtr, TInt aSize );
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    void AppendBufferL(RBuf8* aDes, TUint8* aPtr, TInt aSize );
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private: // data    
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    CMetaDataUtilityBody* iBody;
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    MMDUChunkDataObserver& iObserver;
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    TAggregateState iState;
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    RBuf8 iMimeType;
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    TDesC8* iUserChunk;
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    RBuf8 iPrevBuf;         // to save previous data
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    RBuf8 iMetaDataBuf;     
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    TBool iFinalChunk;
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    TInt iMetaDataSize;
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};
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#endif	// METADATABUFFERAGG_H