FreeCalypso > hg > sms-coding-utils

annotate libcoding/hexdecode.c @ 31:19476164c54d

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doc/SMS-PDU-decoding: document imported utilities
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 14 Jun 2024 18:48:58 +0000
parents 7418ca2e9949
children
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1 /*
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2 * This library module implements decoding of long hex strings,
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3 * such as SMS PDUs.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <ctype.h>
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8
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9 decode_hex_line(inbuf, outbuf, outmax)
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10 char *inbuf;
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11 u_char *outbuf;
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12 unsigned outmax;
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13 {
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14 char *inp = inbuf;
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15 u_char *outp = outbuf;
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16 unsigned outcnt = 0;
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17 int c, d[2], i;
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18
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19 while (*inp) {
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20 if (!isxdigit(inp[0]) || !isxdigit(inp[1]))
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21 return(-1);
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22 if (outcnt >= outmax)
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23 break;
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24 for (i = 0; i < 2; i++) {
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25 c = *inp++;
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26 if (isdigit(c))
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27 d[i] = c - '0';
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28 else if (isupper(c))
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29 d[i] = c - 'A' + 10;
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30 else
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31 d[i] = c - 'a' + 10;
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32 }
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33 *outp++ = (d[0] << 4) | d[1];
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34 outcnt++;
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35 }
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36 return outcnt;
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37 }