FreeCalypso > hg > freecalypso-tools

annotate tchtools/fc-tch2fr.c @ 1011:6d9b10633f10 default tip

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etmsync Pirelli IMEI retrieval: fix poor use of printf() Bug reported by Vadim Yanitskiy <fixeria@osmocom.org>: the construct where a static-allocated string was passed to printf() without any format arguments causes newer compilers to report a security problem. Given that formatted output is not needed here, just fixed string output, change printf() to fputs(), and direct the error message to stderr while at it.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 23 May 2024 17:29:57 +0000
parents a7ad6b39e01b
children
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6
d57f68d0568d fc-tch2fr utility written, added under miscutil
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parents:
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1 /*
903
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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2 * This program reads TCH downlink capture files in the old format from 2016
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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3 * (the format which fc-shell tch record will write if the firmware running
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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4 * on the Calypso GSM device is an old version that emits TCH DL bits in
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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5 * the old format from 2016), completely *disregards* all 3 status words
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
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parents: 902
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6 * including the essential word of control flags, converts the 260-bit
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
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parents: 902
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7 * payload portion of each frame into standard libgsm/RTP format, and
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
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parents: 902
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8 * writes the result into a .gsm binary file.
6
d57f68d0568d fc-tch2fr utility written, added under miscutil
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9 *
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10 * This program was written in 2016, at that time we (FreeCalypso team)
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
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parents: 902
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11 * did not have a proper understanding of how the complete TCH DL processing
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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12 * chain works - we particularly missed the Rx DTX handler block that MUST
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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13 * be present between the output of the GSM 05.03 channel decoder and the
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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14 * input to the GSM 06.10 speech decoder - and therefore the function
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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15 * performed by this program is a bogo-transform.
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d57f68d0568d fc-tch2fr utility written, added under miscutil
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16 *
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parents: 902
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17 * This bogo-transform program is kept as part of FC host tools package
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
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parents: 902
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18 * only for backward compatibility - for actual decoding of TCH DL captures,
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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19 * please use our new gsmfr-dlcap-* and gsmefr-dlcap-* utilities that are
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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20 * maintained as part of Themyscira Wireless GSM codec libraries & utilities
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
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21 * package.
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22 */
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23
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24 #include <sys/types.h>
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25 #include <ctype.h>
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26 #include <stdio.h>
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27 #include <stdlib.h>
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28
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29 static
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30 decode_hex_digit(ch)
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31 {
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32 if (isdigit(ch))
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33 return(ch - '0');
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34 else if (isupper(ch))
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35 return(ch - 'A' + 10);
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36 else
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37 return(ch - 'a' + 10);
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38 }
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39
d57f68d0568d fc-tch2fr utility written, added under miscutil
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40 main(argc, argv)
d57f68d0568d fc-tch2fr utility written, added under miscutil
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41 char **argv;
d57f68d0568d fc-tch2fr utility written, added under miscutil
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42 {
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43 FILE *inf, *outf;
d57f68d0568d fc-tch2fr utility written, added under miscutil
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44 char linebuf[128];
d57f68d0568d fc-tch2fr utility written, added under miscutil
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45 int lineno;
d57f68d0568d fc-tch2fr utility written, added under miscutil
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46 char *cp;
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47 int i, j;
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48 u_char tidsp_bytes[33], libgsm_bytes[33];
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49
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50 if (argc != 3) {
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51 fprintf(stderr, "usage: %s infile outfile\n", argv[0]);
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52 exit(1);
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53 }
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54 inf = fopen(argv[1], "r");
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55 if (!inf) {
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56 perror(argv[1]);
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57 exit(1);
d57f68d0568d fc-tch2fr utility written, added under miscutil
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58 }
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59 outf = fopen(argv[2], "w");
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60 if (!outf) {
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61 perror(argv[2]);
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62 exit(1);
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63 }
d57f68d0568d fc-tch2fr utility written, added under miscutil
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64 for (lineno = 1; fgets(linebuf, sizeof linebuf, inf); lineno++) {
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65 /* skip DSP status words */
d57f68d0568d fc-tch2fr utility written, added under miscutil
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66 cp = linebuf;
d57f68d0568d fc-tch2fr utility written, added under miscutil
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67 for (i = 0; i < 3; i++) {
d57f68d0568d fc-tch2fr utility written, added under miscutil
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68 for (j = 0; j < 4; j++) {
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69 if (!isxdigit(*cp++)) {
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70 invalid: fprintf(stderr,
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71 "error: %s is not in the expected format\n",
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72 argv[1]);
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73 exit(1);
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74 }
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75 }
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76 if (*cp++ != ' ')
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77 goto invalid;
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78 }
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79 /* read the frame bits */
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80 for (i = 0; i < 33; i++) {
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81 if (!isxdigit(cp[0]) || !isxdigit(cp[1]))
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82 goto invalid;
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83 tidsp_bytes[i] = (decode_hex_digit(cp[0]) << 4) |
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84 decode_hex_digit(cp[1]);
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85 cp += 2;
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86 }
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87 gsm0610_tidsp_to_libgsm(tidsp_bytes, libgsm_bytes);
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88 fwrite(libgsm_bytes, 1, 33, outf);
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89 }
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90 exit(0);
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91 }