FreeCalypso > hg > freecalypso-tools

annotate tchtools/fc-vm2gsmx.c @ 921:74d284add54d

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fc-fsio: guard against bogus readdir results from the target If the FFS being operated on contains SE K2x0 extended filenames, readdir will return strings that are bad for printing. We need to guard against this possibility, and also against possible other bogosity that could be sent by other alien firmwares.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 31 Dec 2022 22:55:23 +0000
parents 546bf873ccc8
children
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1 /*
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2 * This utility converts old-fashioned (non-AMR) TCS211 voice memo files
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3 * read out of FFS into Themyscira Wireless gsmx (extended-libgsm) format,
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4 * allowing further decoding into playable speech with gsmfr-decode.
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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 <stdio.h>
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9 #include <stdlib.h>
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10
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11 static char *infname;
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12 static FILE *inf, *outf;
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13 static u_long file_offset;
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14
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15 static const u_char bfi_marker[2] = {0xBF, 0x00};
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16
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17 static unsigned
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18 get_word()
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19 {
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20 u_char b[2];
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21 int i, c;
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22
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23 for (i = 0; i < 2; i++) {
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24 c = getc(inf);
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25 if (c < 0) {
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26 fprintf(stderr, "error: premature EOF in %s\n",
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27 infname);
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28 exit(1);
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29 }
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30 b[i] = c;
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31 file_offset++;
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32 }
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33 return((b[1] << 8) | b[0]);
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34 }
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35
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36 static void
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37 read_dsp_bytes(bytes)
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38 u_char *bytes;
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39 {
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40 int i, dp;
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41 unsigned word;
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42
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43 dp = 0;
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44 for (i = 0; i < 17; i++) {
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45 word = get_word();
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46 bytes[dp++] = word >> 8;
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47 bytes[dp++] = word;
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48 }
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49 }
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50
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51 static void
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52 convert_speech_sample()
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53 {
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54 u_char tidsp_bytes[34], libgsm_bytes[33];
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55
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56 read_dsp_bytes(tidsp_bytes);
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57 gsm0610_tidsp_to_libgsm(tidsp_bytes, libgsm_bytes);
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58 fwrite(libgsm_bytes, 1, 33, outf);
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59 }
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60
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61 main(argc, argv)
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62 char **argv;
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63 {
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64 unsigned first_word;
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65
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66 if (argc != 3) {
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67 fprintf(stderr, "usage: %s infile outfile\n", argv[0]);
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68 exit(1);
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69 }
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70 infname = argv[1];
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71 inf = fopen(infname, "r");
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72 if (!inf) {
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73 perror(infname);
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74 exit(1);
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75 }
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76 outf = fopen(argv[2], "w");
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77 if (!outf) {
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78 perror(argv[2]);
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79 exit(1);
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80 }
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81 for (;;) {
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82 first_word = get_word();
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83 if (first_word == 0xFBFF) /* SC_VM_END_MASK */
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84 break;
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85 if ((first_word & 0xB7FF) == 0x8400) {
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86 /* skip dummy header words 1 and 2 */
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87 get_word();
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88 get_word();
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89 /* process the actual speech or SID frame */
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90 convert_speech_sample();
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91 } else if (first_word == 0x0400) {
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92 /* it's a skipped frame, aka BFI */
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93 fwrite(bfi_marker, 1, 2, outf);
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94 } else {
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95 fprintf(stderr,
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96 "error in %s at offset 0x%lx: invalid frame header word 0x%04X\n",
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97 infname, file_offset, first_word);
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98 exit(1);
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99 }
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100 }
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101 fclose(outf);
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102 exit(0);
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103 }