sl@0: // Copyright (c) 2001-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: // All rights reserved.
sl@0: // This component and the accompanying materials are made available
sl@0: // under the terms of "Eclipse Public License v1.0"
sl@0: // which accompanies this distribution, and is available
sl@0: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: //
sl@0: // Initial Contributors:
sl@0: // Nokia Corporation - initial contribution.
sl@0: //
sl@0: // Contributors:
sl@0: //
sl@0: // Description:
sl@0: // File contains internal classes for Ascii To Base64 converison
sl@0: // and vice-versa.
sl@0: // 
sl@0: //
sl@0: 
sl@0: /**
sl@0:  @file TConvBase64.h
sl@0:  @internalAll
sl@0:  @released
sl@0: */
sl@0: 
sl@0: #ifndef __TCONVBASE64_H__
sl@0: #define __TCONVBASE64_H__
sl@0: 
sl@0: #include <e32base.h>
sl@0: 
sl@0: 
sl@0: const TInt KMaxB64EncodedCharsPerLine = 60;
sl@0: // Could be increased to 75 characters for every encoded line if KDecodeLineLength = 675.  
sl@0: // 60 was chosen to maintain existing behaviour.
sl@0: const TInt8 KImcvLookUpStartOffset = 43;
sl@0: const TUint8 KImcvConvEquals = '=';
sl@0: const TInt8 AsciiToBase64[80]=
sl@0: 	{
sl@0:     62, -1, -1, -1, 63, 52, 53, 54, 55, 56,
sl@0:     57, 58, 59, 60, 61, -1, -1, -1, 64, -1,
sl@0:     -1, -1,  0,  1,  2,  3,  4,  5,  6,  7,
sl@0:     8,  9, 10, 11, 12, 13, 14, 15, 16, 17,
sl@0:     18, 19, 20, 21, 22, 23, 24, 25, -1, -1,
sl@0:     -1, -1, -1, -1, 26, 27, 28, 29, 30, 31,
sl@0:     32, 33, 34, 35, 36, 37, 38, 39, 40, 41,
sl@0:     42, 43, 44, 45, 46, 47, 48, 49, 50, 51
sl@0:     };
sl@0: const TInt8 Base64ToAscii[65]=
sl@0: 	{
sl@0:     65, 66, 67, 68, 69, 70, 71, 72, 73, 74,
sl@0:     75, 76, 77, 78, 79, 80, 81, 82, 83, 84,
sl@0:     85, 86, 87, 88, 89, 90, 97, 98, 99,100,
sl@0:     101,102,103,104,105,106,107,108,109,110,
sl@0:     111,112,113,114,115,116,117,118,119,120,
sl@0:     121,122, 48, 49, 50, 51, 52, 53, 54, 55,
sl@0:     56, 57, 43, 47, 61 
sl@0:     };
sl@0:     
sl@0: /**
sl@0: Base64 encoding and decoding class.
sl@0: @internalAll
sl@0: @released
sl@0: */    
sl@0: class TBase64
sl@0: 	{
sl@0: private:
sl@0: 	/** 
sl@0: 		enum base64 coding defines 
sl@0: 	*/
sl@0: 	enum
sl@0: 	{ 
sl@0: 	/** Padding characters	*/
sl@0: 	EPadChar = 64 
sl@0: 	};
sl@0: 	
sl@0: 	/** 
sl@0: 	enum for EMaskValues
sl@0: 	*/
sl@0: 	enum EMaskValues
sl@0: 	{ 
sl@0: 	/**	Mask Six bits */
sl@0: 	ESixBitMask = 0x3F, 
sl@0: 	/** Mask Eight bits */
sl@0: 	EEightBitMask = 0xFF 
sl@0: 	};
sl@0: 	
sl@0: 	/** 
sl@0: 	enum for EMaskShiftValues
sl@0: 	*/
sl@0: 	enum EMaskShiftValues
sl@0: 	{ 
sl@0: 	/** enum for 6 	*/
sl@0: 	ESix = 6,
sl@0: 	/** enum for 4 	*/ 
sl@0: 	EFour = 4, 
sl@0: 	/** enum for 2	*/
sl@0: 	ETwo = 2, 
sl@0: 	/** enum for 0	*/
sl@0: 	EZero = 0 
sl@0: 	};
sl@0: 
sl@0: public:
sl@0: 	IMPORT_C TBase64();
sl@0: 	IMPORT_C TInt Encode( const TDesC8& aSrcString, TDes8& rDestString);
sl@0: 	IMPORT_C TBool Decode( const TDesC8& aSrcString, TDes8& rDestString);
sl@0: 	IMPORT_C TInt PortableEncode(const TDesC8& aSrcString, TDes8& aDestString, TInt aLineLength=-1);
sl@0: private:
sl@0: 
sl@0: 	TInt iShiftStored;
sl@0: 	TInt iMaskShiftStored;	
sl@0: 	};
sl@0: 	
sl@0: #endif	// __TCONVBASE64_H__