phonebookui/Phonebook2/USIMExtension/inc/CPsu2CharConv.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 10:12:17 +0200
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Revision: 201003 Kit: 201005
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/*
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* Copyright (c) 2002-2007 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:  A class for converting characters and checking if the data is
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*                too long.
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*
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*/
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#ifndef CPSU2CHARCONV_H
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#define CPSU2CHARCONV_H
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// INCLUDE FILES
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#include <e32base.h>
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#include <f32file.h>
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#include <charconv.h>
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// FORWARD DECLARATIONS
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class RFs;
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class CCnvCharacterSetConverter;
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// CLASS DECLARATION
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class CPsu2CharConv : public CBase
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    {
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    public:
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        /**
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        * Two-phased constructor.
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        *
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        * @param aFs an open file system session
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        * @param aCharacterSet The character set to use. See charconv.h.
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        * @return a new instance of this class
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        */
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        static CPsu2CharConv* NewL( RFs& aFs, const TUint aChacterSet );
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        /**
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        * Two-phased constructor.
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        *
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        * @param aFs an open file system session
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        * @param aCharacterSet The character set to use. See charconv.h.
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        * @return a new instance of this class
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        */
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        static CPsu2CharConv* NewLC( RFs& aFs, const TUint aChacterSet );
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        /**
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         * Destructor.
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         */
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        ~CPsu2CharConv();
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    public: // Data structures
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        /// Used for indicating contact field validity
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        /// from (U)SIM store point of view
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        enum TPsu2FieldValidity
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            {
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            /// It's OK to add the field to the entry
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            EOk,
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            /// The data is too long for this field type
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            ETooLong
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            };
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    public: // Interface
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        void SetDownGradeLf( CCnvCharacterSetConverter::
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                TDowngradeForExoticLineTerminatingCharacters aDowngrade );
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        /**
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         * Checks contact field validity.
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         *
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         * @param aData         The data to be saved to the field.
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         * @param aMaxLength    Maximum length of the field.
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         * @param aValidity     Contains the validity value afterwards.
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         * @return  A pointer to the given data. The length depends
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         *          on aValidity. If ETooLong, the pointer points to
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         *          the aData but the length is cut. Can be used to add
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         *          the data to the entry without problems. In other cases
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         *          the pointer points to the given aData and
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         *          the length is same.
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         */
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        TPtrC CheckFieldValidityL(
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                const TDesC& aData, 
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                TInt aMaxLength,
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                TPsu2FieldValidity& aValidity );
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        /**
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         * Checks unicode descriptor data length with the current character set
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         * so that conversion from unicode to 8-bit descriptor will not exceed
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         * the given maximum length. Returns either the given descriptor or a
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         * truncated descriptor that can be converted to an 8-bit descriptor
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         * with the given maximum length.
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         *
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         * @param aData         The data to be saved to the field.
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         * @param aMaxLength    Maximum allowed length of the field for the
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         *                      converted data.
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         * @param aUnconvertedCount On return, contains the count of
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         *          characters that could not be converted.
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         * @return  A pointer to the given data. The pointer points to the
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         *          aData but the length is truncated to the length that allows
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         *          making the conversion so that the result length does not
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         *          exceed aMaxLength that was given as a parameter.
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         */
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        TPtrC CheckFieldLengthL(
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                const TDesC& aData, 
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                TInt aMaxLength,
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                TInt& aUnconvertedCount );
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        /**
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         * To check if the text includes unicode characters.
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         * @param aText The text to be checked.
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         * @return ETrue if the text included unicode characters.
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         *          EFalse otherwise.
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         */
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        TBool IsUnicodeL( const TDesC& aText );
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    private:    // Construction
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        /**
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        * Constructor.
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        */
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        CPsu2CharConv( RFs& aFs, const TUint aChacterSet );
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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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        /**
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         * Checks some special cases to need if extra space needs to be
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         * reserved for the data when saving to (U)SIM.
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         * @param aData The data to be saved to (U)SIM.
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         * @param aConvertedLength The length of the conversion. The function
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         *          increases this if any extra space needs to be reserved.
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         */
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        void ReviseLength(
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                const TDesC& aData, TInt& aConvertedLength );
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    private:    // Data
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        /// A file system session for characted converter
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        RFs iFs;
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        /// Own: Symbian's character converter
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        CCnvCharacterSetConverter* iConverter;
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        /// Character set identier as given to the constructors
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        TUint iCharacterSetIdentifier;
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	};
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#endif // CPSU2CHARCONV_H
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// End of File