FreeCalypso > hg > freecalypso-tools
comparison uptools/libcoding/hexdecode.c @ 329:18c692984549
uptools/libcoding: hex line decoding implemented
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 03 Feb 2018 20:37:14 +0000 |
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328:978571e23318 | 329:18c692984549 |
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1 /* | |
2 * This library module implements decoding of long hex strings, | |
3 * such as SMS PDUs. | |
4 */ | |
5 | |
6 #include <sys/types.h> | |
7 #include <ctype.h> | |
8 | |
9 decode_hex_line(inbuf, outbuf, outmax) | |
10 char *inbuf; | |
11 u_char *outbuf; | |
12 unsigned outmax; | |
13 { | |
14 char *inp = inbuf; | |
15 u_char *outp = outbuf; | |
16 unsigned outcnt = 0; | |
17 int c, d[2], i; | |
18 | |
19 while (*inp) { | |
20 if (!isxdigit(inp[0]) || !isxdigit(inp[1])) | |
21 return(-1); | |
22 if (outcnt >= outmax) | |
23 break; | |
24 for (i = 0; i < 2; i++) { | |
25 c = *inp++; | |
26 if (isdigit(c)) | |
27 d[i] = c - '0'; | |
28 else if (isupper(c)) | |
29 d[i] = c - 'A' + 10; | |
30 else | |
31 d[i] = c - 'a' + 10; | |
32 } | |
33 *outp++ = (d[0] << 4) | d[1]; | |
34 outcnt++; | |
35 } | |
36 return outcnt; | |
37 } |