2dc68225 |
1 | /**/ |
2 | |
3 | #include <stdio.h> |
4 | #include <stdlib.h> |
5 | #include <assert.h> |
6 | #include <sysexits.h> |
7 | |
8 | #include "hex.h" |
9 | |
10 | const char *tohex(uint8 *data, int len, char *buf) { |
11 | char *p; |
12 | |
13 | for (p= buf; |
14 | len>0; |
15 | len--, data++, p+=2) |
16 | sprintf(p,"%02x",*data); |
17 | return buf; |
18 | } |
19 | |
20 | void unhex(const char *what, const char *txt, uint8 *datar, int *lenr, |
21 | int minlen, int maxlen) { |
22 | int l, v; |
23 | char buf[3], *ep; |
24 | |
25 | l= strlen(txt); |
26 | if (l%1) { fprintf(stderr,"odd number of hex digits in %s\n",what); exit(EX_DATAERR); } |
27 | l>>=1; |
28 | if (l<minlen) { fprintf(stderr,"too few hex digits in %s\n",what); exit(EX_DATAERR); } |
29 | if (l>maxlen) { fprintf(stderr,"too many hex digits in %s\n",what); exit(EX_DATAERR); } |
30 | |
31 | if (lenr) *lenr= l; |
32 | while (l) { |
33 | buf[0]= *txt++; |
34 | buf[1]= *txt++; |
35 | buf[2]= 0; |
36 | v= strtoul(buf,&ep,16); |
37 | if (*ep) { fprintf(stderr,"not hex digit in %s: %c\n",what,*ep); exit(EX_DATAERR); } |
38 | *datar++= v; |
39 | l--; |
40 | } |
41 | } |