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89bc0b6c DB |
1 | /* |
2 | * QEMU base64 helpers | |
3 | * | |
4 | * Copyright (c) 2015 Red Hat, Inc. | |
5 | * | |
6 | * This library is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | * This library is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. | |
18 | * | |
19 | */ | |
20 | ||
aafd7584 | 21 | #include "qemu/osdep.h" |
89bc0b6c DB |
22 | #include "qemu/base64.h" |
23 | ||
24 | static const char *base64_valid_chars = | |
25 | "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n"; | |
26 | ||
27 | uint8_t *qbase64_decode(const char *input, | |
28 | size_t in_len, | |
29 | size_t *out_len, | |
30 | Error **errp) | |
31 | { | |
32 | *out_len = 0; | |
33 | ||
34 | if (in_len != -1) { | |
35 | /* Lack of NUL terminator is an error */ | |
36 | if (input[in_len] != '\0') { | |
37 | error_setg(errp, "Base64 data is not NUL terminated"); | |
38 | return NULL; | |
39 | } | |
40 | /* Check there's no NULs embedded since we expect | |
41 | * this to be valid base64 data */ | |
42 | if (memchr(input, '\0', in_len) != NULL) { | |
43 | error_setg(errp, "Base64 data contains embedded NUL characters"); | |
44 | return NULL; | |
45 | } | |
46 | ||
47 | /* Now we know its a valid nul terminated string | |
48 | * strspn is safe to use... */ | |
49 | } else { | |
50 | in_len = strlen(input); | |
51 | } | |
52 | ||
53 | if (strspn(input, base64_valid_chars) != in_len) { | |
54 | error_setg(errp, "Base64 data contains invalid characters"); | |
55 | return NULL; | |
56 | } | |
57 | ||
58 | return g_base64_decode(input, out_len); | |
59 | } |