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annotate libutil/plmncodes.c @ 222:8c151bb01d28

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doc/GrcardSIM2-WEKI-file: update for partial understanding and implementation
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 09 Mar 2021 03:13:41 +0000
parents 3ddbc3fea5f0
children
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1 /*
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2 * This module implements some functions for working with MCC-MNC PLMN codes.
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3 */
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4
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5 #include <sys/types.h>
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6 #include <ctype.h>
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7 #include <stdio.h>
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8
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9 decode_plmn_3bytes(bin, asc, space_pad)
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10 u_char *bin;
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11 char *asc;
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12 {
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13 asc[0] = encode_hex_digit(bin[0] & 0xF);
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14 asc[1] = encode_hex_digit(bin[0] >> 4);
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15 asc[2] = encode_hex_digit(bin[1] & 0xF);
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16 asc[3] = '-';
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17 asc[4] = encode_hex_digit(bin[2] & 0xF);
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18 asc[5] = encode_hex_digit(bin[2] >> 4);
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19 asc[6] = encode_hex_digit(bin[1] >> 4);
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20 asc[7] = '\0';
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21 if (asc[6] == 'F') {
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22 if (space_pad)
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23 asc[6] = ' ';
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24 else
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25 asc[6] = '\0';
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26 }
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27 }
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29 encode_plmn_3bytes(asc, bin)
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30 char *asc;
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31 u_char *bin;
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32 {
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33 u_char mcc[3], mnc[3];
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34
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35 if (!isxdigit(asc[0]) || !isxdigit(asc[1]) || !isxdigit(asc[2]))
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36 return(-1);
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37 mcc[0] = decode_hex_digit(asc[0]);
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38 mcc[1] = decode_hex_digit(asc[1]);
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39 mcc[2] = decode_hex_digit(asc[2]);
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40 asc += 3;
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41 if (*asc == '-')
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42 asc++;
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43 if (!isxdigit(asc[0]) || !isxdigit(asc[1]))
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44 return(-1);
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45 mnc[0] = decode_hex_digit(asc[0]);
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46 mnc[1] = decode_hex_digit(asc[1]);
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47 asc += 2;
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48 if (*asc == '\0')
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49 mnc[2] = 0xF;
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50 else if (isxdigit(asc[0]) && asc[1] == '\0')
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51 mnc[2] = decode_hex_digit(*asc);
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52 else
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53 return(-1);
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54 bin[0] = (mcc[1] << 4) | mcc[0];
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55 bin[1] = (mnc[2] << 4) | mcc[2];
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56 bin[2] = (mnc[1] << 4) | mnc[0];
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57 return(0);
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58 }