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1 office 1 /* base64.c
2 * Base-64 conversion
3 *
4 * Wireshark - Network traffic analyzer
5 * By Gerald Combs <gerald@wireshark.org>
6 * Copyright 1998 Gerald Combs
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 */
22  
23 #include "config.h"
24  
25 #include <string.h>
26 #include "base64.h"
27  
28 /* Decode a base64 string in-place - simple and slow algorithm.
29 Return length of result. Taken from rproxy/librsync/base64.c by
30 Andrew Tridgell. */
31  
32 size_t ws_base64_decode_inplace(char *s)
33 {
34 static const char b64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/\r\n";
35 int bit_offset, byte_offset, idx, i;
36 unsigned char *d = (unsigned char *)s;
37 char *p;
38 int cr_idx;
39  
40 /* we will allow CR and LF - but ignore them */
41 cr_idx = (int) (strchr(b64, '\r') - b64);
42  
43 i = 0;
44  
45 while (*s && (p=strchr(b64, *s))) {
46 idx = (int)(p - b64);
47 if(idx < cr_idx) {
48 byte_offset = (i*6)/8;
49 bit_offset = (i*6)%8;
50 d[byte_offset] &= ~((1<<(8-bit_offset))-1);
51 if (bit_offset < 3) {
52 d[byte_offset] |= (idx << (2-bit_offset));
53 } else {
54 d[byte_offset] |= (idx >> (bit_offset-2));
55 d[byte_offset+1] = 0;
56 d[byte_offset+1] |= (idx << (8-(bit_offset-2))) & 0xFF;
57 }
58 i++;
59 }
60 s++;
61 }
62  
63 d[i*3/4] = 0;
64 return i*3/4;
65 }
66  
67 /*
68 * Editor modelines - http://www.wireshark.org/tools/modelines.html
69 *
70 * Local variables:
71 * c-basic-offset: 8
72 * tab-width: 8
73 * indent-tabs-mode: t
74 * End:
75 *
76 * vi: set shiftwidth=8 tabstop=8 noexpandtab:
77 * :indentSize=8:tabSize=8:noTabs=false:
78 */