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/*************************************************************************
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: base64.cpp,v $
*
* $Revision: 1.3 $
*
* last change: $Author: rt $ $Date: 2005-09-08 09:43:56 $
*
* The Contents of this file are made available subject to
* the terms of GNU Lesser General Public License Version 2.1.
*
*
* GNU Lesser General Public License Version 2.1
* =============================================
* Copyright 2005 by Sun Microsystems, Inc.
* 901 San Antonio Road, Palo Alto, CA 94303, USA
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
************************************************************************/
#include <stdio.h>
#include <string.h>
#include "base64.h"
static const char base64_tab[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
extern "C" size_t base64_encode( FILE *fin, FILE *fout )
{
size_t nBytesRead = 0;
size_t nLineLength = 0;
size_t nBytesWritten = 0;
size_t nBytes = 0;
do
{
unsigned char in_buffer[3];
memset( in_buffer, 0, sizeof(in_buffer) );
nBytes = fread( in_buffer, 1, sizeof(in_buffer), fin );
nBytesRead += nBytes;
if ( nBytes )
{
unsigned long value =
((unsigned long)in_buffer[0]) << 16 |
((unsigned long)in_buffer[1]) << 8 |
((unsigned long)in_buffer[2]) << 0;
unsigned char out_buffer[4];
memset( out_buffer, '=', sizeof(out_buffer) );
out_buffer[0] = base64_tab[(value >> 18) & 0x3F];
out_buffer[1] = base64_tab[(value >> 12) & 0x3F];
if ( nBytes > 1 )
{
out_buffer[2] = base64_tab[(value >> 6) & 0x3F];
if ( nBytes > 2 )
out_buffer[3] = base64_tab[(value >> 0) & 0x3F];
}
if ( nLineLength >= 76 )
{
fputs( "\n", fout );
nLineLength = 0;
}
nBytesWritten += fwrite( out_buffer, 1, sizeof(out_buffer), fout );
nLineLength += sizeof(out_buffer);
}
} while ( nBytes );
return nBytesWritten;
}
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