/src/sudo/lib/util/hexchar.c
Line | Count | Source |
1 | | /* |
2 | | * SPDX-License-Identifier: ISC |
3 | | * |
4 | | * Copyright (c) 2013-2015, 2023 Todd C. Miller <Todd.Miller@sudo.ws> |
5 | | * |
6 | | * Permission to use, copy, modify, and distribute this software for any |
7 | | * purpose with or without fee is hereby granted, provided that the above |
8 | | * copyright notice and this permission notice appear in all copies. |
9 | | * |
10 | | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
11 | | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
12 | | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
13 | | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
14 | | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
15 | | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
16 | | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
17 | | */ |
18 | | |
19 | | #include <config.h> |
20 | | |
21 | | #include <sudo_compat.h> |
22 | | #include <sudo_debug.h> |
23 | | #include <sudo_util.h> |
24 | | |
25 | | /* |
26 | | * Converts a two-byte hex string to decimal. |
27 | | * Returns a value 0-255 on success or -1 for invalid input. |
28 | | */ |
29 | | int |
30 | | sudo_hexchar_v1(const char s[restrict static 2]) |
31 | 1.20k | { |
32 | 1.20k | unsigned char result[2]; |
33 | 1.20k | unsigned int i; |
34 | 1.20k | debug_decl(sudo_hexchar, SUDO_DEBUG_UTIL); |
35 | | |
36 | 1.80k | for (i = 0; i < 2; i++) { |
37 | 1.60k | switch (s[i]) { |
38 | 341 | case '0': |
39 | 341 | result[i] = 0; |
40 | 341 | break; |
41 | 46 | case '1': |
42 | 46 | result[i] = 1; |
43 | 46 | break; |
44 | 2 | case '2': |
45 | 2 | result[i] = 2; |
46 | 2 | break; |
47 | 3 | case '3': |
48 | 3 | result[i] = 3; |
49 | 3 | break; |
50 | 126 | case '4': |
51 | 126 | result[i] = 4; |
52 | 126 | break; |
53 | 5 | case '5': |
54 | 5 | result[i] = 5; |
55 | 5 | break; |
56 | 26 | case '6': |
57 | 26 | result[i] = 6; |
58 | 26 | break; |
59 | 3 | case '7': |
60 | 3 | result[i] = 7; |
61 | 3 | break; |
62 | 4 | case '8': |
63 | 4 | result[i] = 8; |
64 | 4 | break; |
65 | 1 | case '9': |
66 | 1 | result[i] = 9; |
67 | 1 | break; |
68 | 21 | case 'A': |
69 | 22 | case 'a': |
70 | 22 | result[i] = 10; |
71 | 22 | break; |
72 | 0 | case 'B': |
73 | 3 | case 'b': |
74 | 3 | result[i] = 11; |
75 | 3 | break; |
76 | 0 | case 'C': |
77 | 0 | case 'c': |
78 | 0 | result[i] = 12; |
79 | 0 | break; |
80 | 1 | case 'D': |
81 | 3 | case 'd': |
82 | 3 | result[i] = 13; |
83 | 3 | break; |
84 | 0 | case 'E': |
85 | 8 | case 'e': |
86 | 8 | result[i] = 14; |
87 | 8 | break; |
88 | 2 | case 'F': |
89 | 11 | case 'f': |
90 | 11 | result[i] = 15; |
91 | 11 | break; |
92 | 999 | default: |
93 | | /* Invalid input. */ |
94 | 999 | debug_return_int(-1); |
95 | 1.60k | } |
96 | 1.60k | } |
97 | 202 | debug_return_int((result[0] << 4) | result[1]); |
98 | 202 | } |