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comparison libutil/revnibbles.c @ 8:34bbb0585cab

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libutil: import from previous fc-pcsc-tools version
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 14 Mar 2021 05:42:37 +0000
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7:b25d4dfe5798 8:34bbb0585cab
1 /*
2 * This module implements some reversed-nibbles parsing functions.
3 */
4
5 #include <sys/types.h>
6
7 decode_reversed_nibbles(bytes, nbytes, dest)
8 u_char *bytes;
9 unsigned nbytes;
10 char *dest;
11 {
12 u_char *sp;
13 char *dp;
14 unsigned n, c;
15
16 sp = bytes;
17 dp = dest;
18 for (n = 0; n < nbytes; n++) {
19 c = *sp & 0xF;
20 *dp++ = encode_hex_digit(c);
21 c = *sp >> 4;
22 *dp++ = encode_hex_digit(c);
23 sp++;
24 }
25 }
26
27 pack_reversed_nibbles(nibbles, bytes, nbytes)
28 u_char *nibbles, *bytes;
29 unsigned nbytes;
30 {
31 u_char *sp, *dp;
32 unsigned n;
33
34 sp = nibbles;
35 dp = bytes;
36 for (n = 0; n < nbytes; n++) {
37 *dp++ = sp[0] | (sp[1] << 4);
38 sp += 2;
39 }
40 }