460b9539 |
1 | /* |
2 | * This file is part of DisOrder |
3 | * Copyright (C) 2004, 2005 Richard Kettlewell |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License as published by |
7 | * the Free Software Foundation; either version 2 of the License, or |
8 | * (at your option) any later version. |
9 | * |
10 | * This program is distributed in the hope that it will be useful, but |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | * General Public License for more details. |
14 | * |
15 | * You should have received a copy of the GNU General Public License |
16 | * along with this program; if not, write to the Free Software |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
18 | * USA |
19 | */ |
20 | |
21 | #include <config.h> |
22 | #include "types.h" |
23 | |
24 | #include <stdio.h> |
25 | #include <string.h> |
26 | |
27 | #include "hex.h" |
28 | #include "mem.h" |
29 | #include "log.h" |
30 | |
31 | char *hex(const uint8_t *ptr, size_t n) { |
32 | char *buf = xmalloc_noptr(n * 2 + 1), *p = buf; |
33 | |
34 | while(n-- > 0) |
35 | p += sprintf(p, "%02x", (unsigned)*ptr++); |
36 | return buf; |
37 | } |
38 | |
39 | int unhexdigitq(int c) { |
40 | switch(c) { |
41 | case '0': return 0; |
42 | case '1': return 1; |
43 | case '2': return 2; |
44 | case '3': return 3; |
45 | case '4': return 4; |
46 | case '5': return 5; |
47 | case '6': return 6; |
48 | case '7': return 7; |
49 | case '8': return 8; |
50 | case '9': return 9; |
51 | case 'a': case 'A': return 10; |
52 | case 'b': case 'B': return 11; |
53 | case 'c': case 'C': return 12; |
54 | case 'd': case 'D': return 13; |
55 | case 'e': case 'E': return 14; |
56 | case 'f': case 'F': return 15; |
57 | default: return -1; |
58 | } |
59 | } |
60 | |
61 | int unhexdigit(int c) { |
62 | int d; |
63 | |
64 | if((d = unhexdigitq(c)) < 0) error(0, "invalid hex digit"); |
65 | return d; |
66 | } |
67 | |
68 | uint8_t *unhex(const char *s, size_t *np) { |
69 | size_t l; |
70 | uint8_t *buf, *p; |
71 | int d1, d2; |
72 | |
73 | if((l = strlen(s)) & 1) { |
74 | error(0, "hex string has odd length"); |
75 | return 0; |
76 | } |
77 | p = buf = xmalloc_noptr(l / 2); |
78 | while(*s) { |
79 | if((d1 = unhexdigit(*s++)) < 0) return 0; |
80 | if((d2 = unhexdigit(*s++)) < 0) return 0; |
81 | *p++ = d1 * 16 + d2; |
82 | } |
83 | if(np) |
84 | *np = l / 2; |
85 | return buf; |
86 | } |
87 | |
88 | /* |
89 | Local Variables: |
90 | c-basic-offset:2 |
91 | comment-column:40 |
92 | End: |
93 | */ |