FreeCalypso > hg > gsm-net-reveng

annotate trau-ul-prep/etsi-bit-rd.c @ 56:b32b644b7d96

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d144/nokia-tcsm2-atrau.bin: captured A-TRAU output from Nokia TCSM2, fed with ul-input from Ater
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 25 Sep 2024 07:42:04 +0000
parents 8957383370c5
children
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22
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1 /*
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2 * In this module we implement utility functions for reading ETSI *.cod
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3 * and *.dec files in either LE or BE format.
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4 */
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5
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6 #include <stdio.h>
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7 #include <stdint.h>
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8 #include <stdlib.h>
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9 #include <string.h>
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10 #include <strings.h>
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11 #include <gsm_efr.h>
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12 #include "etsi.h"
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13
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14 read_etsi_bits(inf, big_endian, bitvec, nwords, filename_for_errs)
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15 FILE *inf;
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16 uint8_t *bitvec;
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17 unsigned nwords;
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18 char *filename_for_errs;
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19 {
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20 uint8_t file_bytes[ETSI_DEC_NWORDS * 2], *sp;
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21 int cc;
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22 unsigned n, upper;
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23
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24 cc = fread(file_bytes, 2, nwords, inf);
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25 if (cc == 0)
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26 return 0;
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27 if (cc != nwords) {
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28 fprintf(stderr, "error: short read from %s\n",
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29 filename_for_errs);
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30 exit(1);
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31 }
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32 sp = file_bytes;
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33 for (n = 0; n < nwords; n++) {
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34 if (big_endian) {
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35 upper = sp[0];
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36 bitvec[n] = sp[1];
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37 } else {
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38 bitvec[n] = sp[0];
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39 upper = sp[1];
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40 }
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41 if (upper) {
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42 fprintf(stderr,
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43 "error in %s: non-zero in what should be %s upper byte\n",
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44 filename_for_errs, big_endian ? "BE" : "LE");
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45 exit(1);
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46 }
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47 sp += 2;
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48 }
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49 return 1;
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50 }
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51
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52 void
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53 bits2frame(input_bits, frame, filename_for_errs, frame_no)
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54 uint8_t *input_bits, *frame;
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55 char *filename_for_errs;
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56 unsigned frame_no;
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57 {
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58 uint8_t bits[248], *sp, *dp;
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59 unsigned nb, byte, mask;
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60
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61 bits[0] = 1;
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62 bits[1] = 1;
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63 bits[2] = 0;
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64 bits[3] = 0;
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65 bcopy(input_bits, bits + 4, 244);
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66 sp = bits;
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67 dp = frame;
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68 for (nb = 0; nb < EFR_RTP_FRAME_LEN; nb++) {
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69 byte = 0;
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70 for (mask = 0x80; mask; mask >>= 1) {
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71 if (*sp > 1) {
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72 fprintf(stderr,
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73 "error in %s frame #%u: data bit > 1\n",
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74 filename_for_errs, frame_no);
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75 exit(1);
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76 }
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77 if (*sp)
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78 byte |= mask;
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79 sp++;
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80 }
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81 *dp++ = byte;
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82 }
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83 }