FreeCalypso > hg > freecalypso-tools

annotate uptools/libcoding/hexdecode.c @ 1012:11391cb6bdc0

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patch from fixeria: doc change from SE K2x0 to K2xx Since their discovery in late 2022, Sony Ericsson K200 and K220 phones were collectively referred to as SE K2x0 in FreeCalypso documentation. However, now that SE K205 has been discovered as yet another member of the same family (same PCBA in different case), it makes more sense to refer to the whole family as SE K2xx.
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 23 Sep 2024 12:23:20 +0000
parents 18c692984549
children
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18c692984549 uptools/libcoding: hex line decoding implemented
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1 /*
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2 * This library module implements decoding of long hex strings,
18c692984549 uptools/libcoding: hex line decoding implemented
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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 }