/* -- updatedd: base64encode.h --
 *
 * Copyright (C) 2002, 2003, 2004, 2005 Philipp Benner
 *
 * This file is part of UpdateDD - http://updatedd.philipp-benner.de.
 *
 * UpdateDD is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * any later version.
 *
 * UpdateDD 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with UpdateDD; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef BASE64
# define BASE64 1

static char table64[]=
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

static inline void
base64encode(char *intext, char *output)
{
	unsigned char ibuf[3];
	unsigned char obuf[4];
	int i;
	int inputparts;
        
	while(*intext) {
		for (i = inputparts = 0; i < 3; i++) {
			if(*intext) {
				inputparts++;
				ibuf[i] = *intext;
				intext++;
			} else
				ibuf[i] = 0;
		}

		obuf [0] = (ibuf [0] & 0xFC) >> 2;
		obuf [1] = ((ibuf [0] & 0x03) << 4) | ((ibuf [1] & 0xF0) >> 4);
		obuf [2] = ((ibuf [1] & 0x0F) << 2) | ((ibuf [2] & 0xC0) >> 6);
		obuf [3] = ibuf [2] & 0x3F;

		switch(inputparts) {
		case 1: /* only one byte read */
			sprintf(output, "%c%c==",
				table64[obuf[0]],
				table64[obuf[1]]);
			break;
		case 2: /* two bytes read */
			sprintf(output, "%c%c%c=",
				table64[obuf[0]],
				table64[obuf[1]],
				table64[obuf[2]]);
			break;
		default:
			sprintf(output, "%c%c%c%c",
				table64[obuf[0]],
				table64[obuf[1]],
				table64[obuf[2]],
				table64[obuf[3]] );
			break;
		}
		output += 4;
	}
	*output=0;
}

#endif /* BASE64 */