// Copyright (c) 2004-2009 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 EXIFREADERWRITER_H

#define EXIFREADERWRITER_H

#include <iclexif.h> // For MExifMetadata declaration

// Forward declarations

class CIfdGeneral;

class CIfd0;

class CIfd1;

class CExifIfd;

class CInteropIfd;

class CGpsIfd;

class CExifReaderWriter : public CBase, public MExifMetadata

	{

public:

	friend class CExifVerifier;

public:

	~CExifReaderWriter();

	// Functions derived from MExifMetaData

	TInt GetIntegerParam(TUint aTag, TUint aIfd, TInt& aParam) const;

	TInt GetShortParam(TUint aTag, TUint aIfd, TUint16& aParam) const;

	TInt GetRationalParam(TUint aTag, TUint aIfd, TInt& aNumer, TInt& aDenom) const;

	TInt GetParam8(TUint aTag, TUint aIfd, HBufC8*& aParam) const;

	TInt GetParam16(TUint aTag, TUint aIfd, HBufC16*& aParam) const;

	TInt GetIntegerArrayParam(TUint aTag, TUint aIfd, CArrayFix<TInt>& aParam) const;

	TInt GetShortArrayParam(TUint aTag, TUint aIfd, CArrayFix<TUint16>& aParam) const;

	TInt GetRationalArrayParam(TUint aTag, TUint aIfd, CArrayFix<TRational>& aParam) const;

	TInt SetParam8(TUint aTag, TUint aIfd, HBufC8* aParam);

	TInt SetParam16(TUint aTag, TUint aIfd, HBufC16* aParam);

	TInt SetIntegerParam(TUint aTag, TUint aIfd, TInt aParam);

	TInt SetShortParam(TUint aTag, TUint aIfd, TUint16 aParam);

	TInt SetRationalParam(TUint aTag, TUint aIfd, TInt aNumerator, TInt aDenominator);	

	TInt SetIntegerArrayParam(TUint aTag, TUint aIfd, CArrayFix<TInt>& aParam);

	TInt SetShortArrayParam(TUint aTag, TUint aIfd, CArrayFix<TUint16>& aParam);

	TInt SetRationalArrayParam(TUint aTag, TUint aIfd, CArrayFix<TRational>& aParam);

	virtual HBufC8* GetJpegThumbnailData();

	virtual void SetThumbnailData(HBufC8* aJpegData);

	TBool IsExifDataModified();

	void ResetExifDataModified();

	// Helper Function

	static TUint ReadUint32(const TBool aIntelByteAlign, const TUint8* aPtr);

	// Helper Function	

	static TUint16 ReadUint16(const TBool aIntelByteAlign, const TUint8* aPtr);

protected:

	void SetUpIfdsL();

	virtual void SetIfd1L()=0;

	TInt CheckExifOffset(const TUint aOffset);

	TBool FindIfdIndex(TInt aRealIfd, TInt& aIfdIndex) const;

	CIfdGeneral* GetIfd(TInt aIndex);

   	void RemoveThumbnailData();

	CExifReaderWriter();

	void InitializeIfdsL(TBool aAlwaysCreateIfd1, TBool aCreateGpsIfd);

	void InitializeIfdsL(TUint8* aData, TUint aApp1Size);	

	void SetThumbnailDataBaseL(CIfdGeneral* ifd1, TBool aKeepIfd1);

	HBufC8* CreateExifHeaderBaseL();

	TInt GetThumbnailLengthOffsetBase(TUint& aThumbnailLengthOffset);

private: // functions

	void ReadHeaderL();

	TInt InternalIfd(const TUint aTag, const TInt aExternalIfd) const;

	TInt CheckTagL(const TUint aTag, const TUint aIfd) const;

	void FindInternalIfdDataL(const TUint aTag, const TUint aExternalIfdNumber, TInt& aInternalIfdNumber, CIfdGeneral*& aInternalIfd);

	CIfdGeneral* FindIfd(const TUint aTag, const TUint aExternalIfd) const;

	TInt ProcessGpsIfdAddParamResult(CIfdGeneral*& aGpsIfd, TInt aAddParamResult);

	CIfdGeneral* CreateAndAppendSubIfdL(CIfdGeneral& aIfd, TUint aTag);

	// thumbnail helper functions

	virtual void WriteExifFileHeaderBaseL(const TUint aApp1Size, TUint8*& aPtr);

	virtual void SetFirstIfdOffsetBase();

	TInt DoSetParam8(TUint aTag, TUint aIfd, HBufC8* aParam);

	TInt DoSetParam16(TUint aTag, TUint aIfd, HBufC16* aParam);

	TInt DoSetIntegerParam(TUint aTag, TUint aIfd, TInt aParam);

	TInt DoSetShortParam(TUint aTag, TUint aIfd, TUint16 aParam);

	TInt DoSetRationalParam(TUint aTag, TUint aIfd, TInt aNumerator, TInt aDenominator);	

	TInt DoSetIntegerArrayParam(TUint aTag, TUint aIfd, CArrayFix<TInt>& aParam);

	TInt DoSetShortArrayParam(TUint aTag, TUint aIfd, CArrayFix<TUint16>& aParam);

	TInt DoSetRationalArrayParam(TUint aTag, TUint aIfd, CArrayFix<TRational>& aParam);

protected:		

	RPointerArray<CIfdGeneral> iIfds; //own IFDs

	TBool iEncodeThumbnail;

	TUint8* iData;

	TBool iIntel;

	const TUint8* iBase;

	TUint16 iExifDataLength;	// used to check that offsets are within a valid range

private: // member variables

	TUint iOffsetToZerothIfd;	

	HBufC8* iJpegThumbnailData;

	TBool iExifDataModified;

	};

#endif // EXIFREADERWRITER_H