| 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 | */ |