1b080a03f9
- source
+ src
* src/Makefile
* src/dynlib/mt/Makefile
* src/dynlib/Makefile
* INSTALL
* Makefile
* ChangeLog
* harbour.spec
* mpkg_tgz.sh
* Renamed 'source' dir to 'src' to move closer to other FOSS
projects. It's also easier to type, plus it has the side
effect that some cmdlines will be shorter in the
build process.
120 lines
4.3 KiB
Plaintext
120 lines
4.3 KiB
Plaintext
/*
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* $Id$
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*/
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/*
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* Harbour Project source code:
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* HB_BASE64DECODE() function
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*
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* Based on VB code by: 1999-2004 Antonin Foller, http://www.motobit.com, http://motobit.cz
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* Converted to Clipper and optimized by Viktor Szakats (harbour.01 syenar.hu)
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* www - http://www.harbour-project.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA (or visit the web site http://www.gnu.org/).
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*
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* As a special exception, the Harbour Project gives permission for
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* additional uses of the text contained in its release of Harbour.
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*
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* The exception is that, if you link the Harbour libraries with other
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* files to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the Harbour library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the Harbour
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* Project under the name Harbour. If you copy code from other
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* Harbour Project or Free Software Foundation releases into a copy of
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* Harbour, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for Harbour, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice.
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*
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*/
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FUNCTION HB_BASE64DECODE( cString )
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LOCAL cResult
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LOCAL nLen
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LOCAL nGroupPos
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LOCAL nGroup
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LOCAL nCharPos
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LOCAL nDataLen
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LOCAL nData
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/* remove white spaces, If any */
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cString := StrTran( cString, Chr( 10 ) )
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cString := StrTran( cString, Chr( 13 ) )
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cString := StrTran( cString, Chr( 9 ) )
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cString := StrTran( cString, " " )
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/* The source must consists from groups with Len of 4 chars */
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IF ( nLen := Len( cString ) ) % 4 != 0
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RETURN "" /* Bad Base64 string */
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ENDIF
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#if 0
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IF nLen > Int( MAXSTRINGLENGTH / 1.34 ) /* Base64 is 1/3rd larger than source text. */
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RETURN "" /* Not enough memory to decode */
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ENDIF
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#endif
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cResult := ""
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/* Now decode each group: */
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FOR nGroupPos := 1 TO nLen STEP 4
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/* Each data group encodes up To 3 actual bytes */
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nDataLen := 3
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nGroup := 0
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FOR nCharPos := 0 TO 3
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/* Convert each character into 6 bits of data, And add it To
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an integer For temporary storage. If a character is a '=', there
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is one fewer data byte. (There can only be a maximum of 2 '=' In
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the whole string.) */
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nData := At( SubStr( cString, nGroupPos + nCharPos, 1 ), "=ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" ) - 2
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DO CASE
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CASE nData >= 0
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/* Do nothing (for speed) */
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CASE nData == -1
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nData := 0
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nDataLen--
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CASE nData == -2
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RETURN "" /* Bad character In Base64 string */
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ENDCASE
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nGroup := 64 * nGroup + nData
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NEXT
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/* Convert the 24 bits to 3 characters
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and add nDataLen characters To out string */
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cResult += Left( Chr( nGroup / 65536 ) +; /* bitwise AND 255, which is done by Chr() automatically */
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Chr( nGroup / 256 ) +; /* bitwise AND 255, which is done by Chr() automatically */
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Chr( nGroup ), nDataLen ) /* bitwise AND 255, which is done by Chr() automatically */
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NEXT
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RETURN cResult
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