mpserviceplugins/m3uplaylistplugin/inc/mpxm3uplaylistimporter.h
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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 "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:  Imports a m3u playlist file
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*
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*/
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#ifndef MPXM3UPLAYLISTIMPORTER_H
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#define MPXM3UPLAYLISTIMPORTER_H
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#include <mpxplaylistpluginobserver.h>
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#include <f32file.h>
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#include <charconv.h>
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class CMPXMediaArray;
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/**
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*  CMPXM3uPlaylistImporter imports a m3u playlist file. Each instance can
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*  only handle the import of one m3u file and the processing starts as
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*  soon as the object is instantiated.
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*
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*  When processing is complete, CMPXM3uPlaylistImporter will invoke
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*  callback through MMPXPlaylistPluginObserver interface. Once completed,
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*  the importing service cannot be restarted. A new instance is required
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*  if the client wishes to import another m3u playlist file.
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*/
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class CMPXM3uPlaylistImporter : 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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    * @param aFs a file session handle
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    * @param aObserver reference to the playlist plugin observer
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    * @param aPlaylistUri URI of the playlist file to be internalized
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    * @param aTopCharacterSet top character set for the current locale
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    * @param aAvailableCharacterSet available character set in the system
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    * @param aStatus caller's request status
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    * @return object of constructed
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    */
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    IMPORT_C static CMPXM3uPlaylistImporter* NewL(
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                RFs* aFs,
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                MMPXPlaylistPluginObserver* aObserver,
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                const TDesC& aPlaylistUri,
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                const CArrayFix<CCnvCharacterSetConverter::SCharacterSet>& aTopCharacterSet,
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                const CArrayFix<CCnvCharacterSetConverter::SCharacterSet>& aAvailableCharacterSet,
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                TRequestStatus& aStatus );
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    /**
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    * Destructor
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    */
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    IMPORT_C virtual ~CMPXM3uPlaylistImporter();
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protected:
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    /**
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    * Constructor
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    *
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    * @param aFs a file session handle
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    * @param aObserver reference to the playlist plugin observer
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    * @param aTopCharacterSet top character set for the current locale
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    * @param aAvailableCharacterSet available character set in the system
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    * @param aStatus caller's request status
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    */
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    IMPORT_C CMPXM3uPlaylistImporter(
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                RFs* aFs,
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                MMPXPlaylistPluginObserver* aObserver,
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                const CArrayFix<CCnvCharacterSetConverter::SCharacterSet>& aTopCharacterSet,
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                const CArrayFix<CCnvCharacterSetConverter::SCharacterSet>& aAvailableCharacterSet,
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                TRequestStatus& aStatus );
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    /**
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    * 2nd phase constructor
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    *
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    * @param aPlaylistUri URI of the playlist file to be internalized
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    */
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    IMPORT_C virtual void ConstructL( const TDesC& aPlaylistUri );
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    /**
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    *  From CActive
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    *  Handles an active object's request completion event
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    */
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    IMPORT_C virtual void RunL();
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    /**
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    * From CActive
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    * Implements cancellation of an outstanding request.
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    */
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    IMPORT_C virtual void DoCancel();
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    /**
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    * Does a step of the task
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    */
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    IMPORT_C virtual void DoTaskStep();
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    /**
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    * Does a step of the task, leave if there is an error
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    */
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    IMPORT_C virtual void DoTaskStepL();
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private:
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    /**
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    * Reads data from playlist file to the buffer
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    */
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    void ReadPlaylistFileToBufferL();
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    /**
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    * Auto detects the character encoding from the supplied character
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    * set
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    * @param aSample a sample of the file
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    * @param aCharSetId auto-detected character set for the supplied
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    *        sample
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    * @param aCharacterSet a character set to detect the encoding from
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    * @return KErrNone if a character set is found; otherwise
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    *         KErrNotFound.
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    */
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    TInt DetectCharacterSetL(
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        const TDesC8& aSample,
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        const CArrayFix<CCnvCharacterSetConverter::SCharacterSet>& aCharacterSet,
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        TUint& aCharSetId);
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    /**
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    * Parses the buffer where playlist file was read to.
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    */
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    void ParsePlaylistBufferL(
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            CMPXMediaArray& aPlaylist,
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            TInt& aInvalidItemCount);
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    /**
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    * Reads next line from iBuffer and stores it to iLine. Returns EFalse
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    * if there are no more new lines.
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    */
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    TBool ReadNextLineL();
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    /**
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    * Decides what to do with an iLine read from iBuffer
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    */
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    void ProcessLineL(
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            CMPXMediaArray& aPlaylist,
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            TInt& aInvalidItemCount);
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    /**
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    * Parses path or extended info from an iLine and stores them to iItem
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    */
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    TInt ParseLineL(
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            CMPXMedia* aItem,
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            TInt& aInvalidItemCount);
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    /**
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    * Parses and returns an absolute path if aPath is relative to playlist
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    * file's path. If path is not valid or it doesn't exist, error code is
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    * returned in aError.
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    *
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    * caller assumes ownership of the returned HBufC
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    */
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    HBufC* ParseAbsolutePathLC(
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            const TDesC& aPath,
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            TInt& aError);
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    /**
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    * compose CMPXMedia to be sent back to the client
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    */
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    void ComposePlaylistL();
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    /**
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    * Reset data members for after completing the current request
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    */
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    void Cleanup();
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    /**
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    * Notify client of the specified error through MMPXPlaylistPluginObserver
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    * interface
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    */
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    void NotifyClient(TInt aError);
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protected:
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    enum TMPXM3UImporterState
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        {
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        EMPXM3UReadBufferWithAutoDetectEncoding,
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        EMPXM3UParseWithAutoDetectEncoding,
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        EMPXM3UComposePlaylistMedia
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        };
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protected:    // Data
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    HBufC*                              iBuffer;
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    TPtrC                               iBufferPtr;
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    TPtrC                               iPlaylistFilePath;
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    HBufC*                              iLine;
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    RFs*                                iFs;      // not owned
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    MMPXPlaylistPluginObserver*         iObserver;// not owned
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    TBool                               iExtendedFormat;
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    TRequestStatus*                     iCallerStatus;
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    TInt                                iEndLineNumber;  
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    TInt                                iCurrentLineNumber;
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    TBool                               iMoreToDo;
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    TBool                               iEndOfFile;
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    CMPXMedia*                          iItem;
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    CMPXMediaArray*                     iAutoEncodingPlaylistArray;
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    TInt                                iAutoEncodingInvalidItems;
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    CMPXMedia*                          iPlaylist;
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    TMPXM3UImporterState                iState;
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    const CArrayFix<CCnvCharacterSetConverter::SCharacterSet>&     iTopCharacterSet;
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    const CArrayFix<CCnvCharacterSetConverter::SCharacterSet>&     iAvailableCharacterSet;
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    };
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#endif   // MPXM3UPLAYLISTIMPORTER_H
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