FreeCalypso > hg > gsm-net-reveng

annotate trau-decode/parse-efr.c @ 14:98c0881c2af0

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tfo/find-is-hdr: move here from freecalypso-reveng This little program was developed in freecalypso-reveng Hg repository in 2023-03, when we didn't have a separate repository for network-side reverse eng, but now that we do have separate repositories for FreeCalypso (mobile side) vs network side reverse eng, move TFO RE work to the proper place.
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 24 May 2024 21:18:22 +0000
parents bf5c9fb431b8
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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4
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1 /*
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2 * This module implements the EFR decoding part of trau-parse.
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3 */
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4
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5 #include <stdio.h>
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6 #include <stdint.h>
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7 #include <stdlib.h>
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8 #include <string.h>
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9 #include <strings.h>
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10 #include <gsm_efr.h>
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11 #include "osmo_bits.h"
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12
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13 /*
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14 * EFR TRAU parity
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15 *
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16 * g(x) = x^3 + x^1 + 1
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17 */
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18 static const struct osmo_crc8gen_code gsm0860_efr_crc3 = {
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19 .bits = 3,
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20 .poly = 0x3,
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21 .init = 0x0,
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22 .remainder = 0x7,
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23 };
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24
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25 /* re-combine EFR parity bits */
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26 static inline void efr_parity_bits_1(ubit_t *check_bits, const ubit_t *d_bits)
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27 {
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28 memcpy(check_bits + 0 , d_bits + 0, 22);
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29 memcpy(check_bits + 22 , d_bits + 24, 3);
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30 check_bits[25] = d_bits[28];
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31 }
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32
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33 static inline void efr_parity_bits_2(ubit_t *check_bits, const ubit_t *d_bits)
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34 {
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35 memcpy(check_bits + 0 , d_bits + 42, 10);
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36 memcpy(check_bits + 10 , d_bits + 90, 2);
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37 }
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38
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39 static inline void efr_parity_bits_3(ubit_t *check_bits, const ubit_t *d_bits)
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40 {
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41 memcpy(check_bits + 0 , d_bits + 98, 5);
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42 check_bits[5] = d_bits[104];
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43 memcpy(check_bits + 6 , d_bits + 143, 2);
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44 }
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45
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46 static inline void efr_parity_bits_4(ubit_t *check_bits, const ubit_t *d_bits)
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47 {
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48 memcpy(check_bits + 0 , d_bits + 151, 10);
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49 memcpy(check_bits + 10 , d_bits + 199, 2);
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50 }
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51
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52 static inline void efr_parity_bits_5(ubit_t *check_bits, const ubit_t *d_bits)
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53 {
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54 memcpy(check_bits + 0 , d_bits + 207, 5);
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55 check_bits[5] = d_bits[213];
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56 memcpy(check_bits + 6 , d_bits + 252, 2);
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57 }
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58
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59 void
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60 check_efr_crc(d_bits)
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61 ubit_t *d_bits;
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62 {
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63 ubit_t check_bits[26];
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64 int rc1, rc2, rc3, rc4, rc5;
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65
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66 efr_parity_bits_1(check_bits, d_bits);
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67 rc1 = osmo_crc8gen_check_bits(&gsm0860_efr_crc3, check_bits, 26,
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68 d_bits + 39);
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69 efr_parity_bits_2(check_bits, d_bits);
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70 rc2 = osmo_crc8gen_check_bits(&gsm0860_efr_crc3, check_bits, 12,
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71 d_bits + 95);
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72 efr_parity_bits_3(check_bits, d_bits);
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73 rc3 = osmo_crc8gen_check_bits(&gsm0860_efr_crc3, check_bits, 8,
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74 d_bits + 148);
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75 efr_parity_bits_4(check_bits, d_bits);
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76 rc4 = osmo_crc8gen_check_bits(&gsm0860_efr_crc3, check_bits, 12,
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77 d_bits + 204);
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78 efr_parity_bits_5(check_bits, d_bits);
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79 rc5 = osmo_crc8gen_check_bits(&gsm0860_efr_crc3, check_bits, 8,
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80 d_bits + 257);
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81 printf(" D1=%u CRC: %s %s %s %s %s\n", d_bits[0],
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82 rc1 ? "bad" : "good", rc2 ? "bad" : "good",
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83 rc3 ? "bad" : "good", rc4 ? "bad" : "good",
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84 rc5 ? "bad" : "good");
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85 }
5
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86
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87 static void
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88 dbits_to_frame(d_bits, frame)
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89 ubit_t *d_bits;
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90 uint8_t *frame;
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91 {
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92 ubit_t intermed[248], *ip;
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93 uint8_t *op, mask;
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94 unsigned nb;
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95
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96 intermed[0] = 1;
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97 intermed[1] = 1;
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98 intermed[2] = 0;
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99 intermed[3] = 0;
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100 bcopy(d_bits + 1, intermed + 4, 38);
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101 bcopy(d_bits + 42, intermed + 42, 53);
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102 bcopy(d_bits + 98, intermed + 95, 50);
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103 bcopy(d_bits + 151, intermed + 145, 53);
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104 bcopy(d_bits + 207, intermed + 198, 50);
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105 ip = intermed;
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106 op = frame;
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107 for (nb = 0; nb < EFR_RTP_FRAME_LEN; nb++) {
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108 *op = 0;
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109 for (mask = 0x80; mask; mask >>= 1) {
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110 if (*ip)
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111 *op |= mask;
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112 ip++;
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113 }
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114 op++;
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115 }
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116 }
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117
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118 void
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119 print_efr_frame(d_bits)
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120 ubit_t *d_bits;
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121 {
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122 uint8_t frame[EFR_RTP_FRAME_LEN];
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123 int16_t params[EFR_NUM_PARAMS];
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124 int i, j, n, sid;
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125
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126 dbits_to_frame(d_bits, frame);
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127 EFR_frame2params(frame, params);
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128 fputs(" EFR frame:\n LPC", stdout);
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129 n = 0;
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130 for (i = 0; i < 5; i++)
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131 printf(" %d", params[n++]);
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132 putchar('\n');
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133 for (i = 0; i < 4; i++) {
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134 fputs(" ", stdout);
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135 for (j = 0; j < 13; j++)
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136 printf(" %d", params[n++]);
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137 putchar('\n');
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138 }
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139 sid = EFR_sid_classify(frame);
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140 printf(" SID recompute: %d\n", sid);
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141 if (!bcmp(frame, EFR_decoder_homing_frame, EFR_RTP_FRAME_LEN))
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142 puts(" Matches DHF");
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parents: 4
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143 }