FreeCalypso > hg > fc-pcsc-tools

annotate libcommon/gsm7_encode.c @ 74:8562d8508cf2

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grcard2-set-{adm,super}-hex commands implemented It appears that GrcardSIM2 cards allow arbitrary 64-bit keys for ADM and SUPER ADM, not necessarily consisting of ASCII digits like the specs require for standard PIN and PUK, and pySim-prog.py in fact sets the ADM key to 4444444444444444 in hex by default, which is not an ASCII digit string. If the cards allow such keys, we need to support them too.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 16 Feb 2021 04:10:36 +0000
parents 90e7020df08a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * This module implements functions for parsing quoted string
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3 * arguments intended for GSM7 string encoding, and actually
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4 * encoding them into GSM7 binary strings.
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5 */
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6
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7 #include <sys/types.h>
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8 #include <ctype.h>
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9 #include <stdio.h>
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10
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8a34f5b7c812 gsm7_encode_table[] factored out into libcommon
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11 extern u_char gsm7_encode_table[256];
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13 qstring_arg_to_gsm7(arg, record, maxlen)
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14 char *arg;
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15 u_char *record;
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16 unsigned maxlen;
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17 {
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18 unsigned acclen, nadd;
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19 char *cp;
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20 int c;
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21
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22 cp = arg;
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23 for (acclen = 0; *cp; ) {
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24 c = *cp++;
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25 if (c == '\\') {
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26 if (*cp == '\0') {
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27 fprintf(stderr,
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28 "error: dangling backslash escape\n");
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29 return(-1);
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30 }
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31 c = *cp++;
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32 if (c >= '0' && c <= '7' && isxdigit(*cp)) {
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33 c = ((c - '0') << 4) | decode_hex_digit(*cp++);
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34 goto bypass_encoding;
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35 }
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36 switch (c) {
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37 case 'n':
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38 c = '\n';
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39 goto bypass_encoding;
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40 case 'r':
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41 c = '\r';
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42 goto bypass_encoding;
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43 case 'e':
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44 c = 0x1B;
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45 goto bypass_encoding;
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46 case '"':
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47 case '\\':
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48 break;
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49 default:
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50 fprintf(stderr,
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51 "error: non-understood backslash escape\n");
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52 return(-1);
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53 }
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54 }
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55 c = gsm7_encode_table[c];
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56 if (c == 0xFF) {
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57 fprintf(stderr,
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58 "error: character in alpha tag string cannot be encoded in GSM7\n");
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59 return(-1);
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60 }
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61 bypass_encoding:
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62 if (c & 0x80)
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63 nadd = 2;
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64 else
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65 nadd = 1;
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66 if (acclen + nadd > maxlen) {
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67 fprintf(stderr,
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68 "error: alpha tag string is longer than SIM limit\n");
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69 return(-1);
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70 }
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71 if (c & 0x80)
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72 record[acclen++] = 0x1B;
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73 record[acclen++] = c & 0x7F;
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74 }
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75 return(acclen);
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76 }