6 * Wireshark - Network traffic analyzer
7 * By Gerald Combs <gerald@wireshark.org>
8 * Copyright 1998 Gerald Combs
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version 2
13 * of the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
32 /* Decode a base64 string in-place - simple and slow algorithm.
33 Return length of result. Taken from rproxy/librsync/base64.c by
36 size_t epan_base64_decode(char *s)
38 static const char b64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/\r\n";
39 int bit_offset, byte_offset, idx, i, n;
40 unsigned char *d = (unsigned char *)s;
44 /* we will allow CR and LF - but ignore them */
45 cr_idx = strchr(b64, '\r') - b64;
49 while (*s && (p=strchr(b64, *s))) {
52 byte_offset = (i*6)/8;
54 d[byte_offset] &= ~((1<<(8-bit_offset))-1);
56 d[byte_offset] |= (idx << (2-bit_offset));
59 d[byte_offset] |= (idx >> (bit_offset-2));
61 d[byte_offset+1] |= (idx << (8-(bit_offset-2))) & 0xFF;