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annotate libcommon/revnibbles.c @ 128:01aed8d0685a

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doc/Low-level-commands: raw apdu command documented
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 20 Feb 2021 20:10:18 +0000
parents 4360a7906f34
children
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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 encode_hex_digit(d)
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8 unsigned d;
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9 {
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10 if (d <= 9)
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11 return(d + '0');
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12 else
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13 return(d - 10 + 'A');
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14 }
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15
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16 decode_reversed_nibbles(bytes, nbytes, dest)
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17 u_char *bytes;
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18 unsigned nbytes;
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19 char *dest;
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20 {
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21 u_char *sp;
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22 char *dp;
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23 unsigned n, c;
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24
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25 sp = bytes;
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26 dp = dest;
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27 for (n = 0; n < nbytes; n++) {
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28 c = *sp & 0xF;
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29 *dp++ = encode_hex_digit(c);
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30 c = *sp >> 4;
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31 *dp++ = encode_hex_digit(c);
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32 sp++;
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33 }
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34 }