// 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 IFDGENERALENTRY_H

#define IFDGENERALENTRY_H

#include <e32base.h>

const TUint8 KNullCharacter = '\0';

class CIfdGeneral;

class CIfdGeneralEntry : public CBase

	{

public:

	friend class CExifVerifier;	

public:

	static CIfdGeneralEntry* NewLC();

	static CIfdGeneralEntry* NewLC(const TUint& aTag, const TUint& aFormat, const TUint& aComponentCount, const TUint8* aParam, CIfdGeneral* aIfd);

	static CIfdGeneralEntry* NewL(const TUint& aTag, const TUint& aFormat, const TUint& aComponentCount, const TUint8* aParam, CIfdGeneral* aIfd, TBool& aUnknownTag);

	~CIfdGeneralEntry();

	TUint Tag();

	TUint Format();

	TUint ComponentCount();

	TUint ValueOffset();

	const TUint8* ActualValue(); 

	// Accessor functions.

	// Returns the number of additional data bytes stored for an IfdEntry (outside of the 12 byte directory entry)

	TInt ExtraSize();

	// returns the total size of the ifd entry

	TInt TotalSize();		

	// Alter fields.

	TInt UpdateRational(const TInt aNumerator, const TInt aDenominator);

	TInt UpdateString(const HBufC8* aStringValue);

	TInt UpdateInteger(const TInt aIntegerValue);

	TInt UpdateShort(const TUint16 aShortValue);

	TInt UpdateData(TUint aComponentCount, const TUint8* aData); // A catch-all update function.

	// Check whether this entry has data of a particular type.

	TBool IsRationalFormat();

	TBool IsStringFormat();

	TBool IsUndefinedFormat();

	TBool IsIntegerFormat();

	TBool IsShortFormat();

	TBool IsUnicodeData();

	// Set fields in a new directory entry.

	TInt SetActualData(const TAny* aActualData, const TUint aSize, const TUint aBytes);

private: // Functions

	void SetTag(const TUint aTag);

	void SetFormat(const TUint aFormat);

	void SetComponentCount(const TUint aCompCount);

	void SetValueOffset(const TUint8* aValueOffset);

	CIfdGeneralEntry();

	void ConstructL();

	void ConstructL(const TUint& aTag, const TUint& aFormat, TUint aComponentCount, const TUint8* aValueOffset, CIfdGeneral* aIfd, TBool& aUnknownTag);

private: // Member variables.

	TUint8* iDirEntryData; // The actual data in a buffer pointed to by this.

	TUint8* iActualData; // Stores n bytes of data pointed to by value offset field.

	CIfdGeneral* iIfd; // not owned

	};

#endif // IFDGENERALENTRY_H