FreeCalypso > hg > freecalypso-tools

annotate uptools/libcoding/hexdecode.c @ 416:30f6d1c32c6f

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doc/Flash-boot-defect article removed (no longer relevant) This article is no longer relevant because the issue in question only affected one (1) defective FCDEV3B board which was not and never will be sold.
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 26 Oct 2018 07:11:08 +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
18c692984549 uptools/libcoding: hex line decoding implemented
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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 }