FreeCalypso > hg > gsm-net-reveng

annotate trau-decode/parse-tfo16.c @ 66:599fac1b882d

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pathloss: implement FSL
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 25 Oct 2024 08:12:28 +0000
parents 5f98c5cae4ea
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
31
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2 * This program reads a 64 kbit/s timeslot recording file and looks for
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3 * TFO frames of GSM 08.62, specifically the FR/EFR kind.
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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
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12 static unsigned file_offset;
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13
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14 static enum {
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15 HUNT_FOR_0,
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16 HUNT_FOUND_0,
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17 GOT_8_ZEROS,
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18 SYNCED
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19 } state;
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20 static unsigned hunt_for_0_count, frame_pos_count;
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21 static uint8_t in_frame_2bit[160], frame_bits[320], d_bits[260];
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22
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23 static void
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24 unpack_dibits()
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25 {
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26 int i, inb;
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27 uint8_t *op;
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28
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29 op = frame_bits;
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30 for (i = 0; i < 160; i++) {
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31 inb = in_frame_2bit[i];
31
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32 if (inb & 1)
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33 *op++ = 1;
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34 else
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35 *op++ = 0;
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36 if (inb & 2)
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37 *op++ = 1;
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38 else
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39 *op++ = 0;
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40 }
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41 }
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42
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43 static unsigned
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44 bits_to_num(bits, nbits)
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45 uint8_t *bits;
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46 unsigned nbits;
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47 {
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48 unsigned accum;
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49 unsigned n;
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50
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51 accum = 0;
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52 for (n = 0; n < nbits; n++) {
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53 accum <<= 1;
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54 if (*bits)
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55 accum |= 1;
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56 bits++;
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57 }
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58 return accum;
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59 }
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60
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61 static void
2
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62 collect_d_bits()
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63 {
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64 bcopy(frame_bits + 33, d_bits, 15);
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65 bcopy(frame_bits + 49, d_bits + 15, 15);
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66 bcopy(frame_bits + 65, d_bits + 30, 15);
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67 bcopy(frame_bits + 81, d_bits + 45, 15);
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68 bcopy(frame_bits + 97, d_bits + 60, 15);
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69 bcopy(frame_bits + 113, d_bits + 75, 15);
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70 bcopy(frame_bits + 129, d_bits + 90, 15);
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71 bcopy(frame_bits + 145, d_bits + 105, 15);
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72 bcopy(frame_bits + 161, d_bits + 120, 15);
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73 bcopy(frame_bits + 177, d_bits + 135, 15);
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74 bcopy(frame_bits + 193, d_bits + 150, 15);
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75 bcopy(frame_bits + 209, d_bits + 165, 15);
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76 bcopy(frame_bits + 225, d_bits + 180, 15);
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77 bcopy(frame_bits + 241, d_bits + 195, 15);
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78 bcopy(frame_bits + 257, d_bits + 210, 15);
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79 bcopy(frame_bits + 273, d_bits + 225, 15);
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80 bcopy(frame_bits + 289, d_bits + 240, 15);
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81 bcopy(frame_bits + 305, d_bits + 255, 5);
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82 }
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83
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84 static void
0
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85 process_frame()
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86 {
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87 unsigned c1_5eq, c6_11;
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88
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89 printf("Frame at 0x%x:\n", file_offset - 159);
0
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90 printf(" C1-C5: %u%u%u%u%u", frame_bits[17], frame_bits[18],
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91 frame_bits[19], frame_bits[20], frame_bits[21]);
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92 c1_5eq = bits_to_num(frame_bits + 17, 4) << 1;
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93 switch (c1_5eq) {
0
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94 case 0x02:
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95 fputs(" (FR UL)", stdout);
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96 break;
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97 case 0x1C:
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98 fputs(" (FR DL)", stdout);
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99 break;
1
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100 case 0x1A:
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101 fputs(" (EFR)", stdout);
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102 break;
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103 case 0x10:
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104 fputs(" (idle UL)", stdout);
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105 break;
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106 case 0x0E:
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107 fputs(" (idle DL)", stdout);
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108 break;
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109 }
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110 putchar('\n');
1
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111 c6_11 = bits_to_num(frame_bits + 22, 6);
0
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112 printf(" C6-C11: %u\n", c6_11);
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113 printf(" C12=%u C13=%u C14=%u C15=%u\n", frame_bits[28],
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114 frame_bits[29], frame_bits[30], frame_bits[31]);
31
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115 switch (c1_5eq) {
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116 case 0x02:
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117 case 0x1C:
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118 collect_d_bits();
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119 print_fr_frame(d_bits);
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120 break;
4
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121 case 0x1A:
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122 collect_d_bits();
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123 check_efr_crc(d_bits);
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124 print_efr_frame(d_bits);
4
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125 break;
2
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126 }
0
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127 printf(" C16=%u C17=%u C18=%u C19=%u C20=%u C21=%u\n",
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128 frame_bits[310], frame_bits[311], frame_bits[312],
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129 frame_bits[313], frame_bits[314], frame_bits[315]);
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130 printf(" T1=%u T2=%u T3=%u T4=%u\n", frame_bits[316], frame_bits[317],
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131 frame_bits[318], frame_bits[319]);
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132 }
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133
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134 static int
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135 check_sync_zeros()
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136 {
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137 int i;
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138
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139 for (i = 0; i < 16; i++) {
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140 if (frame_bits[i])
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141 return 0;
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diff changeset
142 }
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 return 1;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 }
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 static int
31
5f98c5cae4ea new program tfo-parse-fr16
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
147 check_sync_ones_full()
0
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 {
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 int i;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 for (i = 1; i < 20; i++) {
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 if (!frame_bits[i*16])
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 return 0;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 }
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 return 1;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 }
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157
31
5f98c5cae4ea new program tfo-parse-fr16
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
158 static int
5f98c5cae4ea new program tfo-parse-fr16
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
159 check_sync_ones_partial()
5f98c5cae4ea new program tfo-parse-fr16
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
160 {
5f98c5cae4ea new program tfo-parse-fr16
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
161 int i;
5f98c5cae4ea new program tfo-parse-fr16
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
162
5f98c5cae4ea new program tfo-parse-fr16
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
163 for (i = 1; i < 20; i++) {
5f98c5cae4ea new program tfo-parse-fr16
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
164 if ((i & 1) == 0)
5f98c5cae4ea new program tfo-parse-fr16
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
165 continue;
5f98c5cae4ea new program tfo-parse-fr16
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
166 if (!frame_bits[i*16])
5f98c5cae4ea new program tfo-parse-fr16
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
167 return 0;
5f98c5cae4ea new program tfo-parse-fr16
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
168 }
5f98c5cae4ea new program tfo-parse-fr16
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
169 return 1;
5f98c5cae4ea new program tfo-parse-fr16
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
170 }
5f98c5cae4ea new program tfo-parse-fr16
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
171
0
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 static void
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 check_sync()
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174 {
31
5f98c5cae4ea new program tfo-parse-fr16
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
175 if (check_sync_zeros() && check_sync_ones_partial()) {
5f98c5cae4ea new program tfo-parse-fr16
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
176 if (!check_sync_ones_full())
5f98c5cae4ea new program tfo-parse-fr16
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
177 printf(" Sync pattern partially overwritten!\n");
0
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
178 return;
31
5f98c5cae4ea new program tfo-parse-fr16
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
179 }
0
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180 printf("Bad frame sync, returning to hunt state\n");
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 state = HUNT_FOR_0;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 }
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
183
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
184 static void
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185 byte_input(inb)
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186 {
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 switch (state) {
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 case HUNT_FOR_0:
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 if (inb != 0)
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190 return;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191 state = HUNT_FOUND_0;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192 hunt_for_0_count = 1;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
193 return;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194 case HUNT_FOUND_0:
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
195 if (inb != 0) {
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 state = HUNT_FOR_0;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197 return;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
198 }
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
199 hunt_for_0_count++;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
200 if (hunt_for_0_count >= 8)
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
201 state = GOT_8_ZEROS;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202 return;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
203 case GOT_8_ZEROS:
31
5f98c5cae4ea new program tfo-parse-fr16
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
204 if (inb & 1) {
0
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205 printf("Found frame sync at file offset 0x%x\n",
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
206 file_offset - 8);
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207 bzero(in_frame_2bit, 8);
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
208 in_frame_2bit[8] = inb;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
209 frame_pos_count = 9;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
210 state = SYNCED;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
211 return;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
212 }
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
213 if (inb != 0)
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
214 state = HUNT_FOR_0;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
215 return;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
216 case SYNCED:
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
217 in_frame_2bit[frame_pos_count++] = inb;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
218 if (frame_pos_count < 160)
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
219 return;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
220 frame_pos_count = 0;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
221 unpack_dibits();
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
222 process_frame();
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
223 check_sync();
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
224 return;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
225 default:
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
226 fprintf(stderr, "BUG: bad sync state\n");
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
227 abort();
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
228 }
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
229 }
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
230
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
231 main(argc, argv)
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
232 char **argv;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
233 {
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
234 FILE *inf;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
235 int inb;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
236
31
5f98c5cae4ea new program tfo-parse-fr16
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
237 if (argc != 2) {
5f98c5cae4ea new program tfo-parse-fr16
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
238 fprintf(stderr, "usage: %s binfile\n", argv[0]);
0
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
239 exit(1);
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
240 }
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
241 inf = fopen(argv[1], "r");
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
242 if (!inf) {
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
243 perror(argv[1]);
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
244 exit(1);
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
245 }
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
246 state = HUNT_FOR_0;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
247 for (file_offset = 0; ; file_offset++) {
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
248 inb = getc(inf);
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
249 if (inb < 0)
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
250 break;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
251 inb &= 3;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
252 byte_input(inb);
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
253 }
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
254 exit(0);
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
255 }