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annotate trau-decode/trau-hr-dump-hex.c @ 75:b518ab15b518

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trau-decode: new program trau-hr-dump-hex
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 08 Feb 2025 03:38:54 +0000
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children
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75
b518ab15b518 trau-decode: new program trau-hr-dump-hex
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
b518ab15b518 trau-decode: new program trau-hr-dump-hex
Mychaela Falconia <falcon@freecalypso.org>
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2 * This program reads a line-based text file in an ad hoc hex format
b518ab15b518 trau-decode: new program trau-hr-dump-hex
Mychaela Falconia <falcon@freecalypso.org>
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3 * where each line represents a TRAU-8k frame. These TRAU-8k frames
b518ab15b518 trau-decode: new program trau-hr-dump-hex
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4 * are then decoded.
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5 */
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6
b518ab15b518 trau-decode: new program trau-hr-dump-hex
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7 #include <ctype.h>
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8 #include <stdio.h>
b518ab15b518 trau-decode: new program trau-hr-dump-hex
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9 #include <stdint.h>
b518ab15b518 trau-decode: new program trau-hr-dump-hex
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10 #include <stdlib.h>
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11 #include <string.h>
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12 #include <strings.h>
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13
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14 static int
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15 decode_hex_digit(c)
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16 {
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17 if (isdigit(c))
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18 return c - '0';
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19 else if (isupper(c))
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20 return c - 'A' + 10;
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21 else
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22 return c - 'a' + 10;
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23 }
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24
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25 static void
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26 hex2bits(hex, bits)
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27 char *hex;
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28 uint8_t *bits;
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29 {
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30 unsigned n, m, x;
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31
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32 for (n = 0; n < 40; n++) {
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33 x = decode_hex_digit(hex[n]);
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34 for (m = 8; m; m >>= 1) {
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35 if (x & m)
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36 *bits++ = 1;
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37 else
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38 *bits++ = 0;
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39 }
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40 }
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41 }
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42
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43 static void
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44 process_record(hex_frame, lineno)
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45 char *hex_frame;
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46 {
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47 uint8_t frame_bits[160];
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48
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49 printf("line %d: %s\n", lineno, hex_frame);
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50 hex2bits(hex_frame, frame_bits);
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51 print_gsmhr_frame(frame_bits);
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52 }
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53
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54 static void
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55 process_line(linebuf, filename, lineno)
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56 char *linebuf, *filename;
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57 {
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58 char *cp, *np;
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59 unsigned n;
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60
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61 for (cp = linebuf; isspace(*cp); cp++)
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62 ;
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63 if (*cp == '\0' || *cp == '#')
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64 return;
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65 np = cp;
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66 for (n = 0; n < 40; n++) {
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67 if (!isxdigit(*cp))
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68 goto inv;
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69 cp++;
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70 }
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71 if (*cp) {
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72 if (!isspace(*cp))
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73 goto inv;
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74 *cp++ = '\0';
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75 }
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76 while (isspace(*cp))
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77 cp++;
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78 if (*cp != '\0' && *cp != '#')
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79 goto inv;
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80 process_record(np, lineno);
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81 return;
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82
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83 inv: fprintf(stderr, "%s line %d: invalid syntax\n", filename, lineno);
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84 exit(1);
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85 }
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86
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87 main(argc, argv)
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88 char **argv;
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89 {
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90 FILE *inf;
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91 char linebuf[128];
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92 int lineno;
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93
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94 if (argc != 2) {
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95 fprintf(stderr, "usage: %s hex-file\n", argv[0]);
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96 exit(1);
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97 }
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98 inf = fopen(argv[1], "r");
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99 if (!inf) {
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100 perror(argv[1]);
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101 exit(1);
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102 }
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103 for (lineno = 1; fgets(linebuf, sizeof linebuf, inf); lineno++)
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104 process_line(linebuf, argv[1], lineno);
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105 exit(0);
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106 }