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TW-TS-005 reader: fix maximum line length bug TW-TS-005 section 4.1 states: The maximum allowed length of each line is 80 characters, not including the OS-specific newline encoding. The implementation of this line length limit in the TW-TS-005 hex file reader function in the present suite was wrong, such that lines of the full maximum length could not be read. Fix it. Note that this bug affects comment lines too, not just actual RTP payloads. Neither Annex A nor Annex B features an RTP payload format that goes to the maximum of 40 bytes, but if a comment line goes to the maximum allowed length of 80 characters not including the terminating newline, the bug will be triggered, necessitating the present fix.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 25 Feb 2025 07:49:28 +0000
parents bd832a456339
children
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47
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1 /*
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2 * This program reads in an EFR session recording in our binary format
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3 * (presumably obtained by converting from an RTP capture on the network
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4 * side or from a Calypso DSP readout on the mobile side) and converts
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5 * it into ETSI *.dec format, to be fed to ETSI decoder test program.
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6 *
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7 * The output from this program is in the local machine's native byte order.
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8 */
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9
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10 #include <stdio.h>
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11 #include <stdint.h>
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12 #include <stdlib.h>
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13 #include <string.h>
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14 #include <strings.h>
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15 #include "../libgsmefr/gsm_efr.h"
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16 #include "../libtest/binreader.h"
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17
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18 static void
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19 frame2bits(frame, bits)
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20 uint8_t *frame;
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21 uint16_t *bits;
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22 {
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23 unsigned nb, byte, mask, bit;
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24
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25 for (nb = 0; nb < 31; nb++) {
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26 byte = *frame++;
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27 for (mask = 0x80; mask; mask >>= 1) {
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28 if (byte & mask)
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29 bit = 1;
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30 else
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31 bit = 0;
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32 *bits++ = bit;
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33 }
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34 }
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35 }
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36
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37 main(argc, argv)
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38 char **argv;
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39 {
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40 FILE *binf, *outf;
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41 uint8_t frame[BINFILE_MAX_FRAME];
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42 uint16_t bits[250];
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43 int rc;
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44
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45 if (argc != 3) {
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46 fprintf(stderr, "usage: %s input.gsmx output.dec\n", argv[0]);
47
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47 exit(1);
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48 }
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49 binf = fopen(argv[1], "r");
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50 if (!binf) {
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51 perror(argv[1]);
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52 exit(1);
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53 }
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54 outf = fopen(argv[2], "w");
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55 if (!outf) {
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56 perror(argv[2]);
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57 exit(1);
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58 }
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59 for (;;) {
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60 rc = binfile_read_frame(binf, frame);
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61 if (rc < 0) {
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62 fprintf(stderr, "error: garbage in %s\n", argv[1]);
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63 exit(1);
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64 }
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65 if (!rc)
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66 break;
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67 if (frame[0] == 0xBF) {
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68 bits[3] = 1; /* BFI */
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69 bzero(bits + 4, 245 * 2);
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70 bits[249] = frame[1] & 1; /* TAF */
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71 } else if ((frame[0] & 0xF0) == 0xC0) {
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72 frame2bits(frame, bits);
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73 bits[248] = EFR_sid_classify(frame);
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74 bits[249] = 0; /* TAF */
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75 } else {
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76 fprintf(stderr,
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77 "error: %s is not in EFR codec format\n",
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78 argv[1]);
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79 exit(1);
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80 }
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81 fwrite(bits + 3, 2, 247, outf);
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82 }
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83 fclose(outf);
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84 exit(0);
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85 }