// Copyright (c) 1999-2009 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:

//

#ifndef __TIFFCONVERT_H__

#define __TIFFCONVERT_H__

#include "icl/ImagePlugin.h"

#include "TIFFCodec.h"

// Constants.

const TInt KTiffHeaderSize = 8;

const TInt KTiffSignatureLength = 4;

// Helper classes.

// Class to read little/big endian values.

enum TTiffEndianness

	{

	ETiffLittleEndian = 0,

	ETiffBigEndian = 1

	};

class TTiffValueReader

	{

public:

	inline			TTiffValueReader(TTiffEndianness aEndianness = ETiffLittleEndian);

	TUint32			ReadUint32(const TUint8* aPtr) const;

	inline TInt32	ReadInt32(const TUint8* aPtr) const;

	TUint16			ReadUint16(const TUint8* aPtr) const;

	inline TInt16	ReadInt16(const TUint8* aPtr) const;

public:

	TTiffEndianness	iEndianness;

	};

// Format info

class TTiffFormatInfo

	{

public:

	TTiffEndianness	iEndianness;

	TInt			iFirstIfd;

	TUint32			iSignature;

	};

// Decoder.

class CTiffReadCodec;

class CTiffDecoder : public CImageDecoderPlugin

	{

private:

	enum TTiffSubType

		{

		ETiffUnknownSubType, ETiffLittleEndianSubType, ETiffBigEndianSubType

		};

	enum TTiffFormatType

		{

		EFormatGroup3Fax1D = 0, // values must co-incide with .rss image_format[]

		EFormatGroup3Fax2D,

		EFormatGroup4Fax,

		EFormatUnknown

		};

public:

 	static CTiffDecoder* NewL();

 	static CTiffDecoder* NewLittleEndianL();

 	static CTiffDecoder* NewBigEndianL();

	~CTiffDecoder();

	// from CImageDecoder

	void ImageType(TInt aFrameNumber, TUid& aImageType, TUid& aImageSubType) const;

	CFrameInfoStrings* FrameInfoStringsL(RFs& aFs, TInt aFrameNumber);

	TInt CurrentFilePosition();

protected:

	void Cleanup();

private:

	CTiffDecoder(TTiffSubType aTiffSubType);

	void ReadFormatL();

	void ScanDataL();

private:

	TTiffFormatInfo	iFormatInfo;

	TTiffSubType iTiffSubType;

	};

// Inlines

inline TTiffValueReader::TTiffValueReader(TTiffEndianness aEndianness)

	: iEndianness(aEndianness)

	{

	}

inline TInt32 TTiffValueReader::ReadInt32(const TUint8* aPtr) const

	{

	return TInt32(ReadUint32(aPtr));

	}

inline TInt16 TTiffValueReader::ReadInt16(const TUint8* aPtr) const

	{

	return TInt16(ReadUint16(aPtr));

	}

#endif // __TIFFCONVERT_H__