FreeCalypso > hg > sms-coding-utils

annotate libcoding/gsm7_decode_qstring.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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27
7418ca2e9949 libcoding: add functions from freecalypso-tools/uptools/libcoding
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1 /*
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2 * This module implements a function for decoding GSM7 strings
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3 * to ASCII with output to a stdio file; it is an implementation
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4 * of lossless conversion per our SIM-data-formats spec
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5 * in freecalypso-docs.
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6 */
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7
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8 #include <sys/types.h>
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9 #include <stdio.h>
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10
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11 static char basic_table[128] = {
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12 '@', 0, '$', 0, 0, 0, 0, 0,
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13 0, 0, 'n'|0x80, 0, 0, 'r'|0x80, 0, 0,
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14 0, '_', 0, 0, 0, 0, 0, 0,
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15 0, 0, 0, 0, 0, 0, 0, 0,
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16 ' ', '!', '"'|0x80, '#', 0, '%', '&', 0x27,
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17 '(', ')', '*', '+', ',', '-', '.', '/',
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18 '0', '1', '2', '3', '4', '5', '6', '7',
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19 '8', '9', ':', ';', '<', '=', '>', '?',
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20 0, 'A', 'B', 'C', 'D', 'E', 'F', 'G',
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21 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
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22 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
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23 'X', 'Y', 'Z', 0, 0, 0, 0, 0,
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24 0, 'a', 'b', 'c', 'd', 'e', 'f', 'g',
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25 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
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26 'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
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27 'x', 'y', 'z', 0, 0, 0, 0, 0
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28 };
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29
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30 static char escape_table[128] = {
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31 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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32 0, 0, 0, 0, '^', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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33 0, 0, 0, 0, 0, 0, 0, 0, '{', '}', 0, 0, 0, 0, 0, '\\'|0x80,
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34 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, '[', '~', ']', 0,
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35 '|', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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36 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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37 0, 0, 0, 0, 0,'E'|0x80,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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38 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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39 };
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40
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41 void
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42 print_gsm7_string_to_file(data, nbytes, outf)
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43 u_char *data;
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44 unsigned nbytes;
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45 FILE *outf;
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46 {
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47 u_char *dp, *endp;
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48 int b, c;
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49
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50 dp = data;
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51 endp = data + nbytes;
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52 putc('"', outf);
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53 while (dp < endp) {
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54 b = *dp++;
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55 if (b == 0x1B) {
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56 if (dp >= endp || *dp == 0x1B || *dp == '\n' ||
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57 *dp == '\r') {
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58 putc('\\', outf);
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59 putc('e', outf);
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60 continue;
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61 }
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62 b = *dp++;
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63 c = escape_table[b];
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64 if (!c) {
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65 fprintf(outf, "\\e\\%02X", b);
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66 continue;
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67 }
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68 } else {
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69 c = basic_table[b];
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70 if (!c) {
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71 fprintf(outf, "\\%02X", b);
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72 continue;
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73 }
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74 }
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75 if (c & 0x80) {
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76 putc('\\', outf);
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77 c &= 0x7F;
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78 }
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79 putc(c, outf);
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80 }
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81 putc('"', outf);
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82 }