/*

* Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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: 

* Base64 encoding and decoding functions.

*

*/

//

// base64.h

//

/**

 @file

 @internalComponent

*/

#ifndef __BASE64_H__

#define __BASE64_H__

#include <e32base.h>

/**

 * This class performs Base64 encoding and decoding. The implementation

 * has been obtained from messaging.

 */

class TBase64

	{

public:

	/**

	 * Constructs the codec object.

	 */

	IMPORT_C TBase64();

	/**

	 * Initializes the codec.

	 */

	IMPORT_C void Initialize();

	/**

	 * Encodes binary data using base64 encoding.

	 * @param aSrcString Data to encode.

	 * @return Newly allocated buffer containing base64 encoding of

	 *     the data (on the cleanup stack).

	 * @note The function leaves in case of an error.

	 */

	IMPORT_C HBufC8* EncodeLC(const TDesC8& aSrcString);

	/**

	 * Decodes base64-encoded binary data.

	 * @param aSrcString Data to decode.

	 * @param aNeedMoreData Receives ETrue if the encoded string is

	 *     not long enough to decode in full, EFalse otherwise.

	 * @return Newly allocated buffer containing decoded binary data

	 *     (on the cleanup stack).

	 * @note The function leaves in case of an error.

	 */

	IMPORT_C HBufC8* DecodeLC(const TDesC8& aSrcString, TBool& aNeedMoreData);

private:

	enum {EPadChar = 64};

	enum EMaskValues {ESixBitMask = 0x3F, EEightBitMask = 0xFF};

	enum EMaskShiftValues {ESix = 6, EFour = 4, ETwo = 2, EZero = 0};

	static const TUint8 iAlphabet[];

	TInt iShiftStored;

	TInt iMaskShiftStored;

	};

#endif // __BASE64_H__