author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 02:01:42 +0200 | |
changeset 0 | e4d67989cc36 |
child 27 | 3a7375419266 |
permissions | -rw-r--r-- |
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// Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// TBase64.cpp |
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// |
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// |
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#include <tconvbase64.h> |
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/** |
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TBase64 constructor |
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*/ |
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EXPORT_C TBase64::TBase64(): iShiftStored(0), iMaskShiftStored(ESix) |
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{} |
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/** |
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Encodes an ASCII string to Base64 string. |
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@param aSrcString The source string in ASCII code. |
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@param rDestString The destination string with converted base64 values. |
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@return Number of characters in the source string that were not Encoded. |
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*/ |
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EXPORT_C TInt TBase64::Encode(const TDesC8& aSrcString, TDes8& rDestString) |
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{ |
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// Clears the destination string |
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rDestString.Zero(); |
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// Initialise variables |
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const TUint8* srcStringPtr=aSrcString.Ptr(); |
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const TUint8* srcStringEnd=aSrcString.Length()+srcStringPtr; |
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TUint8* destStringPtr=(TUint8*)rDestString.Ptr(); |
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TUint8* destStringPtrBase=destStringPtr; |
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TInt character=0; |
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TUint8 encodedChar=0; |
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TInt charStorage=0; |
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TInt maskShift=EZero; |
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TInt destStringCharNum = 0; |
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while(srcStringPtr<=srcStringEnd) |
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{ |
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// maskShift is used as a char read counter |
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if(maskShift==ESix) |
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{ |
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// If the 3rd char read is also the last char then the while loop |
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// is broken on the next check. |
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if(srcStringPtr==srcStringEnd) |
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srcStringPtr++; |
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maskShift=EZero; |
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character=0; |
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} |
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else |
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{ |
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if(srcStringPtr==srcStringEnd) |
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character=0; |
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else |
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character=*srcStringPtr; |
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srcStringPtr++; |
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// Shifts charStorage ready for the next char |
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charStorage=charStorage<<8; |
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maskShift+=ETwo; |
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} |
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charStorage=charStorage|character; |
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// Shifts the mask to the correct bit location |
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// Masks (AND's) the valid bits from charStorage |
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// Shifts the valid bits into the low order 8bits |
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// Converts to BASE64 char, Casts the result to an unsigned char (which it should be ?....I hope) |
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encodedChar=(TUint8)Base64ToAscii[((charStorage>>maskShift)&ESixBitMask)]; |
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*destStringPtr++=encodedChar; |
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destStringCharNum++; |
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|
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// Add a CRLF every KMaxB64EncodedCharsPerLine characters so as not to exceed the line length |
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// limitation specified in RFC 2822. |
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if (destStringCharNum == KMaxB64EncodedCharsPerLine) |
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{ |
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destStringCharNum = 0; |
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*destStringPtr++ = '\r'; |
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*destStringPtr++ = '\n'; |
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} |
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} |
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// Check for not enough chars and pad if required |
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if (maskShift==EFour) |
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{ |
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*destStringPtr++=KImcvConvEquals; |
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*destStringPtr++=KImcvConvEquals; |
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} |
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else |
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if(maskShift==ESix) |
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*destStringPtr++=KImcvConvEquals; |
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|
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rDestString.SetLength((TInt)(destStringPtr-destStringPtrBase)); |
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return ((TInt)(srcStringPtr-srcStringEnd)); |
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} |
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/** |
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Decodes the Base64 string to ASCII pattern. |
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@param aSrcString The source string in Base64 codeset. |
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@param rDestString The destination string with converted ASCII code values. |
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@return ETrue if aSrcString is not long enough to decode fully, resulting in the storage of |
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the last character and requiring another aSrcString (poss 0 length) to be passed to it to clear this character. |
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Returns EFalse if the line was decoded OK or the end of the encoded file is reached ie "=" |
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*/ |
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EXPORT_C TBool TBase64::Decode(const TDesC8& aSrcString, TDes8& rDestString) |
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{ |
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TInt decodedInt=0; |
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TInt8 offsetChar=0; |
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TUint8 decodedChar=0; |
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// Clears the destination string |
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rDestString.Zero(); |
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// Initialise variables |
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const TUint8* srcStringPtr=aSrcString.Ptr(); |
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const TUint8* srcStringEnd=aSrcString.Length()+srcStringPtr; |
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TUint8* destStringPtr=(TUint8*)rDestString.Ptr(); |
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TUint8* destStringPtrBase=destStringPtr; |
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TInt maskShift=iMaskShiftStored; |
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TInt shiftStorage=iShiftStored; |
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// Main character process loop |
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while(srcStringPtr<srcStringEnd) |
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{ |
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offsetChar=(TInt8)(*srcStringPtr-KImcvLookUpStartOffset); |
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srcStringPtr++; |
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|
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// Check for valid B64 character |
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if((offsetChar>=0)&&(offsetChar<80)) |
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{ |
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// Read in next character and B64 decode |
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decodedInt=AsciiToBase64[offsetChar]; |
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// Exits when a PAD char is reached |
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if(decodedInt==EPadChar) |
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{ |
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rDestString.SetLength((TInt)(destStringPtr-destStringPtrBase)); |
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return EFalse; |
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} |
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|
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// Ensures the first 2 chars of 4 are received before processing |
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if(maskShift==ESix) |
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maskShift=EFour; |
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else |
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{ |
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shiftStorage=shiftStorage<<ESix; |
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shiftStorage=shiftStorage|decodedInt; |
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decodedChar=(TUint8)((shiftStorage>>maskShift)&EEightBitMask); |
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if((maskShift-=ETwo)<EZero) |
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maskShift=ESix; |
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*destStringPtr++=decodedChar; |
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} |
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shiftStorage=decodedInt; |
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} |
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} |
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iShiftStored=shiftStorage; |
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iMaskShiftStored=maskShift; |
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rDestString.SetLength((TInt)(destStringPtr-destStringPtrBase)); |
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return maskShift<ESix; |
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} |