/*

* Copyright (c) 2005 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:  A misc. char-encoding related utilities.

*

*/

#ifndef XML_ENCODING_H

#define XML_ENCODING_H

// INCLUDES

#include <e32base.h>

#include <f32file.h>

// CONSTANTS

// MACROS

// DATA TYPES

// FUNCTION PROTOTYPES

// FORWARD DECLARATIONS

class CCnvCharacterSetConverter;

// CLASS DECLARATION

/**

*  A misc. char-encoding related utilities.

*

*  \b Library: FeedsEngine.lib

*

*  @since 3.0

*/

class CXmlEncoding: public CBase

    {

    private: // Data types

        struct SupportedEncodings

            {

            TDesC8*  charEncoding;

            TUint    uid;

            };

    public: // Constructors and destructor

        /**

        * Two-phased constructor.

        */

        IMPORT_C static CXmlEncoding* NewL();

        /**

        * Destructor.

        */        

        virtual ~CXmlEncoding();

    public: // New methods

        /**

        * Resolves the given char-encoding into its uid.

        *

        * @since 3.0

        * @param aCharEncoding The encoding.

        * @param aUid The resulting uid for the given encoding.

        * @return ETrue if the encoding was resolved.

        */

        TBool ResolveCharEncodingL(const TDesC8& aCharEncoding, TUint& aUid) const;

        /**

        * Determine the char-encoding.

        *

        * @since 3.0

        * @param aBuffer The native buffer.

        * @param aCharSet The char-set provided by the orignal source

        * @param aEncoding The resulting encoding.

        * @return ETrue if a encoding was determined.

        */

        IMPORT_C TBool DetermineCharEncodingL(const TDesC8& aBuffer, 

                const TDesC& aCharSet, TUint& aEncoding) const;

        /**

        * Determine the char-encoding from the BOM.

        *

        * @since 3.0

        * @param aBuffer The native buffer.

        * @param aEncoding The resulting encoding.

        * @return ETrue if a encoding was determined.

        */

        TBool DetermineCharEncodingFromBom(const TDesC8& aBuffer, TUint& aEncoding) const;

        /**

        * Determine the char-encoding from the char-encoding in the xml-prolog.

        *

        * @since 3.1

        * @param aBuffer The native buffer.

        * @param aEncoding The resulting encoding.

        * @return ETrue if a encoding was determined.

        */

        TBool DetermineCharEncodingFromXmlProlog(const TDesC8& aBuffer, TUint& aEncoding) const;

        /**

        * Erase the char-encoding attribute (if any) from the xml-prolog.

        *

        * @since 3.0

        * @param aUtf8Buffer The utf8 buffer.

        * @return void

        */

        void StripCharEncoding(HBufC8& aUtf8Buffer) const;

        /**

        * Erase the char-encoding attribute (if any) from the xml-prolog.

        *

        * @since 3.0

        * @param aUtf8Buffer The utf8 buffer.

        * @return void

        */

        void StripCharEncoding(HBufC16& aUcs2Buffer) const;

        /**

        * Converts the given native buffer into utf8.

        *

        * @since 3.0

        * @param aEncoding The encoding.

        * @param aBuffer The native buffer.

        * @return The converted buffer.

        */

        IMPORT_C HBufC8* ConvertToUtf8L(TUint aEncoding, const TDesC8& aBuffer) const;

        /**

        * Converts the given native buffer into ucs2.

        *

        * @since 3.0

        * @param aEncoding The encoding.

        * @param aBuffer The native buffer.

        * @return The converted buffer.

        */

        IMPORT_C HBufC16* ConvertToUcs2L(TUint aEncoding, const TDesC8& aBuffer) const;

    private:

        /**

        * C++ default constructor.

        */

        CXmlEncoding();

        /**

        * By default Symbian 2nd phase constructor is private.

        */

        void ConstructL();

        /**

        * Converts the given ucs2 buffer into utf8.

        *

        * @since 3.0

        * @param aUsc2Buffer The ucs2 buffer.

        * @return The converted buffer.

        */

        HBufC8* ConvertToUtf8L(HBufC16& aUsc2Buffer) const;

        /**

        * Finds the location of the encoding attribute in the xml-prolog.

        *

        * @since 3.0

        * @param aBuffer The native buffer.

        * @param aBegin The beginning of the attribute.

        * @param aEnd  The end of the attribute.

        * @param aValueBegin The beginning of the encoding's value.

        * @param aValueEnd The end of the encoding's value

        * @return ETrue if the encoding was found.

        */

        TBool CXmlEncoding::FindEncoding(const TDesC8& aBuffer, 

                TInt& aBegin, TInt& aEnd, TInt& aValueBegin, TInt& aValueEnd) const;

        /**

        * Finds the location of the encoding attribute in the xml-prolog.

        *

        * @since 3.0

        * @param aBuffer The ucs2 buffer.

        * @param aBegin The beginning of the attribute.

        * @param aEnd  The end of the attribute.

        * @param aValueBegin The beginning of the encoding's value.

        * @param aValueEnd The end of the encoding's value

        * @return ETrue if the encoding was found.

        */

        TBool CXmlEncoding::FindEncoding(const TDesC& aBuffer, 

                TInt& aBegin, TInt& aEnd, TInt& aValueBegin, TInt& aValueEnd) const;

    private:  // Data

        RFs                         iRfs;

        CCnvCharacterSetConverter*  iConverter;

        RArray<SupportedEncodings>  iCharEncodings;

    };

#endif      // XML_ENCODING_H

// End of File