// Copyright (c) 2001-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "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:

//

#include <e32std.h>

#include <e32base.h>

#include <f32file.h>

#include <charconv.h>

class CHtmlToCrtConvBuffer : public CBase

	{

	public:

		static CHtmlToCrtConvBuffer* NewL(const TDesC& aFile, RFs& aFsSession, CCnvCharacterSetConverter& aCnvCharacterSetConverter);

		~CHtmlToCrtConvBuffer();

	/**

		@fn		TBool ReadCharacterL(TChar& aCharacter, TInt& aBufferPosition, TBool& aEndOfBuffer)		

		Intended Usage	: gets next character from the file

		@param	aCharacter the character which was read

		@param	aBufferPosition	the current buffer position

		@param	aEndOfBuffer	ETrue if end of buffer reached, else EFalse

		@return	TBool ETrue if character read, else EFalse

	 */

		TBool ReadCharacterL(TChar& aCharacter, TInt& aBufferPosition, TBool& aEndOfBuffer);

		void GetPartOfBufferL(TPtrC16& aPartOfBuffer, TInt aStartPosition, TInt aEndPosition) const;

		void GetToEndOfBufferL(TPtrC16& aPartOfBuffer, TInt aStartPosition) const;

	/**

		@fn		GetSampleOfTextFromFileL(TDes8& aSample, TInt aLength, TInt aOffset)

		Intended Usage	:	reads the specified number of characters from the file at a specified offset 

		@param	aSample	descriptor into which characters are read

		@param	aLength	number of characters to be read

		@param	aOffset	offset from start of file

		@return	void

	 */

		void GetSampleOfTextFromFileL(TDes8& aSample, TInt aLength, TInt aOffset);

		void ResetL();

	private:

		CHtmlToCrtConvBuffer(CCnvCharacterSetConverter& aCnvCharacterSetConverter);

		void ConstructL(const TDesC& aFile, RFs& aFsSession);

	/**

		@fn		TBool FillBufferL()

		Intended Usage	:	used to read characters from the file into the buffer 

		@return	TBool EFalse if no characters read from file, else Etrue

	 */

		TBool FillBufferL();

		void DoConvertBufferL(TPtr8& aSourcePtr, TPtr16& aUnicodePtr, TInt& aLength, TBool& aEndOfFile);

	private:

		CCnvCharacterSetConverter& iCnvCharacterSetConverter;

		TInt iState;

		RFile iFile;

		HBufC8* iSourceBuffer;

		HBufC16* iUnicodeBuffer;

		TInt iBufferPosition;

	};