sl@0: /*
sl@0: * Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: * All rights reserved.
sl@0: * This component and the accompanying materials are made available
sl@0: * under the terms of "Eclipse Public License v1.0"
sl@0: * which accompanies this distribution, and is available
sl@0: * at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: *
sl@0: * Initial Contributors:
sl@0: * Nokia Corporation - initial contribution.
sl@0: *
sl@0: * Contributors:
sl@0: *
sl@0: * Description: 
sl@0: * Header for the classes that import and export plain text into and out of ETEXT.
sl@0: *
sl@0: */
sl@0: 
sl@0: 
sl@0: #ifndef __TXTPLAIN__
sl@0: #define __TXTPLAIN__ 1
sl@0: 
sl@0: #include <e32std.h>
sl@0: #include <s32mem.h>
sl@0: #include <txtetext.h>
sl@0: #include "TxtWriter.h"
sl@0: 
sl@0: class CCnvCharacterSetConverter;
sl@0: class TPlainTextIOState;
sl@0: 
sl@0: NONSHARABLE_CLASS(CPlainTextConverter) : public CBase
sl@0: /**
sl@0: @internalComponent
sl@0: */
sl@0: 	{
sl@0: 	public:
sl@0: 	static CPlainTextConverter* NewLC();
sl@0: 	~CPlainTextConverter();
sl@0: 	void PrepareToConvertL(TPlainTextIOState& aState,const TDesC8* aSample);
sl@0: 
sl@0: 	enum
sl@0: 		{
sl@0: 		EConversionBufferSize = 1024
sl@0: 		};
sl@0: 
sl@0: 	CCnvCharacterSetConverter* iConverter;	// use this converter to translate input or output
sl@0: 	TUint8* iConversionBuffer;				// the buffer used by iConverter for non-Unicode text
sl@0: 	TInt iConversionBufferLength;			// current number of characters in the conversion buffer
sl@0: 	};
sl@0: 
sl@0: class TPlainTextIOState
sl@0: /**
sl@0: @internalComponent
sl@0: */
sl@0: 	{
sl@0: 	public:
sl@0: 	TPlainTextIOState(const CPlainText::TImportExportParam& aParam,CPlainText::TImportExportResult& aResult,
sl@0: 					  RWriteStream& aOutput,RReadStream& aInput);
sl@0: 	TBool Finished() const
sl@0: 		{ return iResult.iOutputChars >= iParam.iMaxOutputChars || iResult.iInputChars >= iParam.iMaxInputChars; }
sl@0: 	TText ReadRawCharL();
sl@0: 	void WriteRawCharL(TText aChar);
sl@0: 
sl@0: 	const CPlainText::TImportExportParam& iParam;
sl@0: 	CPlainText::TImportExportResult& iResult;
sl@0: 	RWriteStream& iOutput;
sl@0: 	RReadStream& iInput;
sl@0: 	CPlainTextConverter* iConverter;// if non-null, use CHARCONV, via this object, to convert a
sl@0: 									// foreign encoding to or from Unicode
sl@0: 	TBool iSwapInput;				// input needs to be byte-swapped
sl@0: 	TBool iCheckByteOrder;			// flip iSwapInput if the next input character is 0xFFFE (byte-swapped byte order mark)
sl@0: 	};
sl@0: 
sl@0: class TPlainTextWriter: public TPlainTextIOState
sl@0: /**
sl@0: @internalComponent
sl@0: */
sl@0: 	{
sl@0: 	public:
sl@0: 	static void TranslateL(const CPlainText::TImportExportParam& aParam,CPlainText::TImportExportResult& aResult,
sl@0: 						   RWriteStream& aOutput,RReadStream& aInput);
sl@0: 
sl@0: 	private:
sl@0: 	TPlainTextWriter(const CPlainText::TImportExportParam& aParam,CPlainText::TImportExportResult& aResult,
sl@0: 					 RWriteStream& aOutput,RReadStream& aInput);
sl@0: 	void TranslateHelperL();
sl@0: 
sl@0: 	enum
sl@0: 		{
sl@0: 		EDefaultLineBufferSize = CPlainTextConverter::EConversionBufferSize * 2
sl@0: 		};
sl@0: 
sl@0: 	void TranslateToEofL();
sl@0: 	void FlushL();
sl@0: 	void WriteCharL(TText aChar);
sl@0: 	void WriteNewLineL();
sl@0: 	void WriteAndConvertL(const TText* aText,TInt aLength);
sl@0: 
sl@0: 	RBufReadStream iBufReadStream;	// a stream over the input buffer
sl@0: 	TInt iMaxLineLength;			// wrap lines automatically if they exceed this length
sl@0: 	TInt iLineLength;				// length of the current line
sl@0: 	TText* iLineBuffer;				// if non-null, this buffer contains the current line, or Unicode text
sl@0: 									// to be converted to a foreign encoding
sl@0: 	TInt iMaxLineBufferLength;		// maximum number of characters in iLineBuffer
sl@0: 	};
sl@0: 
sl@0: /**
sl@0: @internalComponent
sl@0: */
sl@0: NONSHARABLE_CLASS(TPlainTextReader) : public TPlainTextIOState, public MOutputChar
sl@0: 	{
sl@0: 	public:
sl@0: 	static void TranslateL(const CPlainText::TImportExportParam& aParam,CPlainText::TImportExportResult& aResult,
sl@0: 						   RWriteStream& aOutput,RReadStream& aInput);
sl@0: 
sl@0: 	private:
sl@0: 	TPlainTextReader(const CPlainText::TImportExportParam& aParam,CPlainText::TImportExportResult& aResult,
sl@0: 					 RWriteStream& aOutput,RReadStream& aInput);
sl@0: 	void TranslateHelperL(TSLBTransaltor& aSLBTranslator);
sl@0: 
sl@0: 	enum
sl@0: 		{
sl@0: 		EInputBufferSize = CPlainTextConverter::EConversionBufferSize * 2
sl@0: 		};
sl@0: 
sl@0: 	void TranslateToEofL(TSLBTransaltor& aSLBTranslator);
sl@0: 	TText ReadAndConvertL();
sl@0: 	virtual void OutputCharL(TText aChar);
sl@0: 
sl@0: 	TText* iInputBuffer;				// if non-null, this buffer contains Unicode text
sl@0: 										// converted from a foreign encoding
sl@0: 	TInt iInputLength;					// number of characters currently stored in iInputBuffer
sl@0: 	TInt iInputPos;						// current position in iInputBuffer;
sl@0: 	TInt iConversionState;				// state used by iConverter when converting to Unicode
sl@0: 	};
sl@0: 
sl@0: #endif // __TXTPLAIN__