textrendering/texthandling/stext/TXTPLAIN.H
author Pat Downey <patd@symbian.org>
Wed, 01 Sep 2010 12:39:40 +0100
branchRCL_3
changeset 55 336bee5c2d35
parent 0 1fb32624e06b
permissions -rw-r--r--
Revert incorrect RCL_3 drop: Revision: 201021 Kit: 201035
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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/*
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* Copyright (c) 1998-2009 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 "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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* Header for the classes that import and export plain text into and out of ETEXT.
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*
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*/
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#ifndef __TXTPLAIN__
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#define __TXTPLAIN__ 1
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#include <e32std.h>
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#include <s32mem.h>
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#include <txtetext.h>
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#include "TxtWriter.h"
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class CCnvCharacterSetConverter;
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class TPlainTextIOState;
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NONSHARABLE_CLASS(CPlainTextConverter) : public CBase
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/**
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@internalComponent
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*/
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	{
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	public:
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	static CPlainTextConverter* NewLC();
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	~CPlainTextConverter();
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	void PrepareToConvertL(TPlainTextIOState& aState,const TDesC8* aSample);
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	enum
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		{
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		EConversionBufferSize = 1024
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		};
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	CCnvCharacterSetConverter* iConverter;	// use this converter to translate input or output
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	TUint8* iConversionBuffer;				// the buffer used by iConverter for non-Unicode text
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	TInt iConversionBufferLength;			// current number of characters in the conversion buffer
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	};
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class TPlainTextIOState
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/**
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@internalComponent
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*/
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	{
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	public:
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	TPlainTextIOState(const CPlainText::TImportExportParam& aParam,CPlainText::TImportExportResult& aResult,
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					  RWriteStream& aOutput,RReadStream& aInput);
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	TBool Finished() const
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		{ return iResult.iOutputChars >= iParam.iMaxOutputChars || iResult.iInputChars >= iParam.iMaxInputChars; }
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	TText ReadRawCharL();
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	void WriteRawCharL(TText aChar);
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	const CPlainText::TImportExportParam& iParam;
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	CPlainText::TImportExportResult& iResult;
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	RWriteStream& iOutput;
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	RReadStream& iInput;
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	CPlainTextConverter* iConverter;// if non-null, use CHARCONV, via this object, to convert a
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									// foreign encoding to or from Unicode
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	TBool iSwapInput;				// input needs to be byte-swapped
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	TBool iCheckByteOrder;			// flip iSwapInput if the next input character is 0xFFFE (byte-swapped byte order mark)
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	};
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class TPlainTextWriter: public TPlainTextIOState
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/**
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@internalComponent
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*/
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	{
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	public:
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	static void TranslateL(const CPlainText::TImportExportParam& aParam,CPlainText::TImportExportResult& aResult,
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						   RWriteStream& aOutput,RReadStream& aInput);
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	private:
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	TPlainTextWriter(const CPlainText::TImportExportParam& aParam,CPlainText::TImportExportResult& aResult,
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					 RWriteStream& aOutput,RReadStream& aInput);
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	void TranslateHelperL();
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	enum
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		{
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		EDefaultLineBufferSize = CPlainTextConverter::EConversionBufferSize * 2
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		};
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	void TranslateToEofL();
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	void FlushL();
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	void WriteCharL(TText aChar);
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	void WriteNewLineL();
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	void WriteAndConvertL(const TText* aText,TInt aLength);
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	RBufReadStream iBufReadStream;	// a stream over the input buffer
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	TInt iMaxLineLength;			// wrap lines automatically if they exceed this length
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	TInt iLineLength;				// length of the current line
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	TText* iLineBuffer;				// if non-null, this buffer contains the current line, or Unicode text
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									// to be converted to a foreign encoding
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	TInt iMaxLineBufferLength;		// maximum number of characters in iLineBuffer
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	};
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/**
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@internalComponent
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*/
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NONSHARABLE_CLASS(TPlainTextReader) : public TPlainTextIOState, public MOutputChar
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	{
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	public:
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	static void TranslateL(const CPlainText::TImportExportParam& aParam,CPlainText::TImportExportResult& aResult,
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						   RWriteStream& aOutput,RReadStream& aInput);
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	private:
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	TPlainTextReader(const CPlainText::TImportExportParam& aParam,CPlainText::TImportExportResult& aResult,
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					 RWriteStream& aOutput,RReadStream& aInput);
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	void TranslateHelperL(TSLBTransaltor& aSLBTranslator);
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	enum
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		{
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		EInputBufferSize = CPlainTextConverter::EConversionBufferSize * 2
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		};
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	void TranslateToEofL(TSLBTransaltor& aSLBTranslator);
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	TText ReadAndConvertL();
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	virtual void OutputCharL(TText aChar);
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	TText* iInputBuffer;				// if non-null, this buffer contains Unicode text
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										// converted from a foreign encoding
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	TInt iInputLength;					// number of characters currently stored in iInputBuffer
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	TInt iInputPos;						// current position in iInputBuffer;
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	TInt iConversionState;				// state used by iConverter when converting to Unicode
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	};
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#endif // __TXTPLAIN__