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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
30 /* Decode a base64 string in-place - simple and slow algorithm.
31 Return length of result. Taken from rproxy/librsync/base64.c by
34 size_t epan_base64_decode(char *s)
36 static const char b64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/\r\n";
37 int bit_offset, byte_offset, idx, i;
38 unsigned char *d = (unsigned char *)s;
42 /* we will allow CR and LF - but ignore them */
43 cr_idx = (int) (strchr(b64, '\r') - b64);
47 while (*s && (p=strchr(b64, *s))) {
50 byte_offset = (i*6)/8;
52 d[byte_offset] &= ~((1<<(8-bit_offset))-1);
54 d[byte_offset] |= (idx << (2-bit_offset));
56 d[byte_offset] |= (idx >> (bit_offset-2));
58 d[byte_offset+1] |= (idx << (8-(bit_offset-2))) & 0xFF;
69 /* Return a tvb that contains the binary representation of a base64
73 base64_to_tvb(tvbuff_t *parent, const char *base64)
76 char *data = g_strdup(base64);
79 len = (gint) epan_base64_decode(data);
80 tvb = tvb_new_child_real_data(parent, (const guint8 *)data, len, len);
82 tvb_set_free_cb(tvb, g_free);