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/*
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* Copyright (c) 1997-2009 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 the License "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:
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*
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*/
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/**
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@file
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@internalComponent
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*/
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#if !defined(__UTF_H__)
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#define __UTF_H__
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#if !defined(__E32STD_H__)
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#include <e32std.h>
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#endif
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class CnvUtfConverter
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/**
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Converts text between Unicode (UCS-2) and the two Unicode transformation
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formats UTF-7 and UTF-8. There are no functions to convert directly between
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UTF-7 and UTF-8.
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Objects of this class do not need to be created because all the member functions
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are static. The four functions are passed text in the second argument and
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output the resulting text in the first argument. Sixteen-bit descriptors are
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used to hold text encoded in UCS-2 (i.e. normal 16 bit Unicode), and eight-bit
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descriptors are used to hold text encoded in either of the transformation
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formats.
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The conversion functions return the number of characters which were not converted
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because the output descriptor was not long enough to hold all of the converted
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text. This allows users of this class to perform partial conversions on an
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input descriptor, handling the case when the input descriptor is truncated
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mid way through a multi-byte character. The caller does not have to guess
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how big to make the output descriptor for a given input descriptor- they
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can simply do the conversion in a loop using a small output descriptor. The
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ability to handle truncated descriptors is particularly useful if the caller
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is receiving information in chunks from an external source.
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*/
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{
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public:
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/** Conversion error flags. At this stage there is only one error flag
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- others may be added in the future. */
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enum TError
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{
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/** The input descriptor contains a single corrupt character. This
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might occur when the input descriptor only contains some of the bytes
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of a single multi-byte character. */
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EErrorIllFormedInput=KErrCorrupt
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};
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/** Initial value for the state argument in a set of related calls to
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ConvertToUnicode(). */
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enum {KStateDefault=0};
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public:
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// the conversion functions return either one of the TError values above, or the number of unconverted elements left at the end of the input descriptor
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IMPORT_C static TInt ConvertFromUnicodeToUtf8(TDes8& aUtf8, const TDesC16& aUnicode);
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static TInt ConvertFromUnicodeToUtf8(TDes8& aUtf8, const TDesC16& aUnicode, TBool aGenerateJavaConformantUtf8);
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IMPORT_C static TInt ConvertToUnicodeFromUtf8(TDes16& aUnicode, const TDesC8& aUtf8);
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static TInt ConvertToUnicodeFromUtf8(TDes16& aUnicode, const TDesC8& aUtf8, TBool aGenerateJavaConformantUtf8);
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static TInt ConvertToUnicodeFromUtf8(TDes16& aUnicode, const TDesC8& aUtf8, TBool aGenerateJavaConformantUtf8,
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TInt& aNumberOfUnconvertibleCharacters, TInt& aIndexOfFirstByteOfFirstUnconvertibleCharacter);
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};
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#endif
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