9f16c2bf8e
* *
* update copyright headers with new FSF postal address
* COPYING.txt -> LICENSE.txt (rest of repo to be synced)
121 lines
3.9 KiB
C
121 lines
3.9 KiB
C
/*
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* BASE64 encoder
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*
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* Copyright 2003 Giancarlo Niccolai <gian@niccolai.ws>
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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 program; see the file LICENSE.txt. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA (or visit https://www.gnu.org/licenses/).
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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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#include "hbapi.h"
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#include "hbapierr.h"
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HB_FUNC( HB_BASE64ENCODE )
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{
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HB_SIZE len = hb_parclen( 1 );
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if( len > 0 )
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{
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HB_SIZE lin = hb_parns( 2 );
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HB_SIZE dst = ( 4 * ( ( len + 2 ) / 3 ) + 1 );
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if( lin <= 2 )
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lin = 0;
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if( lin )
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dst += ( ( dst + lin - 1 ) / lin ) * 2;
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dst *= sizeof( char );
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if( dst > len )
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{
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const char * s = hb_parcx( 1 );
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char * t, * p;
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HB_SIZE lln = lin;
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t = p = ( char * ) hb_xgrab( dst );
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while( len-- > 0 )
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{
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#define ADD_EOL() do { if( --lln == 0 ) { *p++ = '\r'; *p++ = '\n'; lln = lin; } } while( 0 )
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#define ADD_CHAR( c ) do { *p++ = s_b64chars[ ( c ) & 0x3F ]; ADD_EOL(); } while( 0 )
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#define ADD_EQ() do { *p++ = '='; ADD_EOL(); } while( 0 )
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static const char s_b64chars[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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int x, y;
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x = *s++;
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ADD_CHAR( x >> 2 );
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if( len-- == 0 )
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{
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ADD_CHAR( x << 4 );
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ADD_EQ();
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ADD_EQ();
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break;
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}
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y = *s++;
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ADD_CHAR( ( x << 4 ) | ( ( y >> 4 ) & 0x0F ) );
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if( len-- == 0 )
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{
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ADD_CHAR( y << 2 );
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ADD_EQ();
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break;
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}
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x = *s++;
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ADD_CHAR( ( y << 2 ) | ( ( x >> 6 ) & 0x03 ) );
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ADD_CHAR( x );
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}
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if( lin && lin != lln )
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{
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*p++ = '\r';
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*p++ = '\n';
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}
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*p = '\0';
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hb_retclen_buffer( t, p - t );
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}
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else
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hb_errRT_BASE( EG_STROVERFLOW, 9999, NULL, HB_ERR_FUNCNAME, HB_ERR_ARGS_BASEPARAMS );
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}
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else
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hb_retc_null();
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}
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