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annotate libutil/revnibbles.c @ 64:dba24129027e

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doc/ADM-PIN-numbering article written
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 23 Mar 2021 23:30:00 +0000
parents 34bbb0585cab
children
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34bbb0585cab libutil: import from previous fc-pcsc-tools version
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1 /*
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2 * This module implements some reversed-nibbles parsing functions.
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3 */
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4
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5 #include <sys/types.h>
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6
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7 decode_reversed_nibbles(bytes, nbytes, dest)
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8 u_char *bytes;
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9 unsigned nbytes;
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10 char *dest;
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11 {
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12 u_char *sp;
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13 char *dp;
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14 unsigned n, c;
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15
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16 sp = bytes;
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17 dp = dest;
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18 for (n = 0; n < nbytes; n++) {
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19 c = *sp & 0xF;
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20 *dp++ = encode_hex_digit(c);
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21 c = *sp >> 4;
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22 *dp++ = encode_hex_digit(c);
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23 sp++;
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24 }
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25 }
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26
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27 pack_reversed_nibbles(nibbles, bytes, nbytes)
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28 u_char *nibbles, *bytes;
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29 unsigned nbytes;
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30 {
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31 u_char *sp, *dp;
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32 unsigned n;
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33
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34 sp = nibbles;
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35 dp = bytes;
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36 for (n = 0; n < nbytes; n++) {
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37 *dp++ = sp[0] | (sp[1] << 4);
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38 sp += 2;
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39 }
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40 }