FreeCalypso > hg > gsm-net-reveng

annotate trau-parse.c @ 0:131e0f1972bb

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beginning of trau-parse program
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 24 May 2024 07:17:23 +0000
parents
children b0dcd48a1c8a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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Mychaela Falconia <falcon@freecalypso.org>
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2 * This program reads a 64 kbit/s timeslot recording file, examines one
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
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3 * of the four 16 kbit/s subslots (selected), looks for GSM 08.60 TRAU
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
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4 * frames, and dumps whatever it finds.
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5 */
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6
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7 #include <stdio.h>
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8 #include <stdint.h>
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9 #include <stdlib.h>
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10 #include <string.h>
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11 #include <strings.h>
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12
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13 static unsigned file_offset;
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14
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15 static enum {
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16 HUNT_FOR_0,
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17 HUNT_FOUND_0,
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18 GOT_8_ZEROS,
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19 SYNCED
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Mychaela Falconia <falcon@freecalypso.org>
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20 } state;
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21 static unsigned hunt_for_0_count, frame_pos_count;
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Mychaela Falconia <falcon@freecalypso.org>
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22 static uint8_t in_frame_2bit[160], frame_bits[320];
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23
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24 static void
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25 unpack_dibits()
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26 {
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27 int i, inb;
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28 uint8_t *op;
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29
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30 op = frame_bits;
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31 for (i = 0; i < 160; i++) {
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32 inb = in_frame_2bit[i];
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33 if (inb & 2)
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34 *op++ = 1;
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35 else
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36 *op++ = 0;
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Mychaela Falconia <falcon@freecalypso.org>
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37 if (inb & 1)
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38 *op++ = 1;
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Mychaela Falconia <falcon@freecalypso.org>
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39 else
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40 *op++ = 0;
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41 }
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42 }
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43
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44 static unsigned
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Mychaela Falconia <falcon@freecalypso.org>
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45 bits_to_num(bits, nbits)
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Mychaela Falconia <falcon@freecalypso.org>
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46 uint8_t *bits;
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47 unsigned nbits;
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48 {
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Mychaela Falconia <falcon@freecalypso.org>
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49 unsigned accum;
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Mychaela Falconia <falcon@freecalypso.org>
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50 unsigned n;
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51
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52 accum = 0;
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Mychaela Falconia <falcon@freecalypso.org>
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53 for (n = 0; n < nbits; n++) {
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Mychaela Falconia <falcon@freecalypso.org>
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54 accum <<= 1;
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Mychaela Falconia <falcon@freecalypso.org>
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55 if (*bits)
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Mychaela Falconia <falcon@freecalypso.org>
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56 accum |= 1;
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Mychaela Falconia <falcon@freecalypso.org>
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57 bits++;
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Mychaela Falconia <falcon@freecalypso.org>
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58 }
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Mychaela Falconia <falcon@freecalypso.org>
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59 return accum;
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Mychaela Falconia <falcon@freecalypso.org>
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60 }
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Mychaela Falconia <falcon@freecalypso.org>
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61
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62 static void
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Mychaela Falconia <falcon@freecalypso.org>
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63 process_frame()
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Mychaela Falconia <falcon@freecalypso.org>
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64 {
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Mychaela Falconia <falcon@freecalypso.org>
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65 unsigned c1_5, c6_11;
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Mychaela Falconia <falcon@freecalypso.org>
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66
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Mychaela Falconia <falcon@freecalypso.org>
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67 printf("Frame at 0x%x:\n", file_offset - 160);
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Mychaela Falconia <falcon@freecalypso.org>
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68 printf(" C1-C5: %u%u%u%u%u", frame_bits[17], frame_bits[18],
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Mychaela Falconia <falcon@freecalypso.org>
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69 frame_bits[19], frame_bits[20], frame_bits[21]);
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70 c1_5 = bits_to_num(frame_bits + 17);
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Mychaela Falconia <falcon@freecalypso.org>
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71 switch (c1_5) {
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Mychaela Falconia <falcon@freecalypso.org>
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72 case 0x02:
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Mychaela Falconia <falcon@freecalypso.org>
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73 fputs(" (FR UL)", stdout);
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74 break;
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Mychaela Falconia <falcon@freecalypso.org>
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75 case 0x1C:
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76 fputs(" (FR DL)", stdout);
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77 break;
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78 case 0x1E:
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79 fputs(" (EFR)", stdout);
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80 break;
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Mychaela Falconia <falcon@freecalypso.org>
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81 case 0x10:
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Mychaela Falconia <falcon@freecalypso.org>
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82 fputs(" (idle UL)", stdout);
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Mychaela Falconia <falcon@freecalypso.org>
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83 break;
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Mychaela Falconia <falcon@freecalypso.org>
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84 case 0x0E:
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85 fputs(" (idle DL)", stdout);
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86 break;
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Mychaela Falconia <falcon@freecalypso.org>
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87 }
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Mychaela Falconia <falcon@freecalypso.org>
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88 putchar('\n');
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Mychaela Falconia <falcon@freecalypso.org>
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89 c6_11 = bits_to_num(frame_bits + 22);
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90 printf(" C6-C11: %u\n", c6_11);
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91 printf(" C12=%u C13=%u C14=%u C15=%u\n", frame_bits[28],
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92 frame_bits[29], frame_bits[30], frame_bits[31]);
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93 /* payload to be handled */
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94 printf(" C16=%u C17=%u C18=%u C19=%u C20=%u C21=%u\n",
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95 frame_bits[310], frame_bits[311], frame_bits[312],
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96 frame_bits[313], frame_bits[314], frame_bits[315]);
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97 printf(" T1=%u T2=%u T3=%u T4=%u\n", frame_bits[316], frame_bits[317],
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98 frame_bits[318], frame_bits[319]);
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99 }
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100
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101 static int
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102 check_sync_zeros()
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Mychaela Falconia <falcon@freecalypso.org>
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103 {
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104 int i;
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105
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106 for (i = 0; i < 16; i++) {
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Mychaela Falconia <falcon@freecalypso.org>
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107 if (frame_bits[i])
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108 return 0;
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Mychaela Falconia <falcon@freecalypso.org>
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109 }
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110 return 1;
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111 }
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112
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113 static int
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114 check_sync_ones()
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Mychaela Falconia <falcon@freecalypso.org>
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115 {
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116 int i;
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117
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118 for (i = 1; i < 20; i++) {
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Mychaela Falconia <falcon@freecalypso.org>
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119 if (!frame_bits[i*16])
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120 return 0;
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Mychaela Falconia <falcon@freecalypso.org>
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121 }
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Mychaela Falconia <falcon@freecalypso.org>
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122 return 1;
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Mychaela Falconia <falcon@freecalypso.org>
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123 }
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Mychaela Falconia <falcon@freecalypso.org>
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124
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125 static void
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126 check_sync()
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Mychaela Falconia <falcon@freecalypso.org>
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127 {
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Mychaela Falconia <falcon@freecalypso.org>
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128 if (check_sync_zeros() && check_sync_ones())
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Mychaela Falconia <falcon@freecalypso.org>
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129 return;
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Mychaela Falconia <falcon@freecalypso.org>
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130 printf("Bad frame sync, returning to hunt state\n");
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Mychaela Falconia <falcon@freecalypso.org>
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131 state = HUNT_FOR_0;
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Mychaela Falconia <falcon@freecalypso.org>
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132 }
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Mychaela Falconia <falcon@freecalypso.org>
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133
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134 static void
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Mychaela Falconia <falcon@freecalypso.org>
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135 byte_input(inb)
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Mychaela Falconia <falcon@freecalypso.org>
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136 {
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Mychaela Falconia <falcon@freecalypso.org>
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137 switch (state) {
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Mychaela Falconia <falcon@freecalypso.org>
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138 case HUNT_FOR_0:
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Mychaela Falconia <falcon@freecalypso.org>
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139 if (inb != 0)
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Mychaela Falconia <falcon@freecalypso.org>
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140 return;
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Mychaela Falconia <falcon@freecalypso.org>
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141 state = HUNT_FOUND_0;
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Mychaela Falconia <falcon@freecalypso.org>
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142 hunt_for_0_count = 1;
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Mychaela Falconia <falcon@freecalypso.org>
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143 return;
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Mychaela Falconia <falcon@freecalypso.org>
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144 case HUNT_FOUND_0:
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Mychaela Falconia <falcon@freecalypso.org>
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145 if (inb != 0) {
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Mychaela Falconia <falcon@freecalypso.org>
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146 state = HUNT_FOR_0;
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Mychaela Falconia <falcon@freecalypso.org>
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147 return;
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Mychaela Falconia <falcon@freecalypso.org>
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148 }
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Mychaela Falconia <falcon@freecalypso.org>
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149 hunt_for_0_count++;
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Mychaela Falconia <falcon@freecalypso.org>
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150 if (hunt_for_0_count >= 8)
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Mychaela Falconia <falcon@freecalypso.org>
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151 state = GOT_8_ZEROS;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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152 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 case GOT_8_ZEROS:
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 if (inb & 2) {
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 printf("Found frame sync at file offset 0x%x\n",
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 file_offset - 8);
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 bzero(in_frame_2bit, 8);
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 in_frame_2bit[8] = inb;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 frame_pos_count = 9;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 state = SYNCED;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 return;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 }
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 if (inb != 0)
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 state = HUNT_FOR_0;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 return;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166 case SYNCED:
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
167 in_frame_2bit[frame_pos_count++] = inb;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 if (frame_pos_count < 160)
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169 return;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170 frame_pos_count = 0;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171 unpack_dibits();
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 process_frame();
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 return;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
175 default:
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
176 fprintf(stderr, "BUG: bad sync state\n");
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
177 abort();
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
178 }
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179 }
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 main(argc, argv)
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 char **argv;
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 FILE *inf;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185 int subslot, right_shift;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186 int inb;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 if (argc != 3) {
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 fprintf(stderr, "usage: %s binfile subslot\n", argv[0]);
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190 exit(1);
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191 }
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192 inf = fopen(argv[1], "r");
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
193 if (!inf) {
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194 perror(argv[1]);
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
195 exit(1);
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 }
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197 subslot = atoi(argv[2]);
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
198 if (subslot < 0 || subslot > 3) {
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
199 fprintf(stderr, "error: invalid subslot argument\n");
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
200 exit(1);
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
201 }
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202 right_shift = (3 - subslot) * 2;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
203 state = HUNT_FOR_0;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
204 for (file_offset = 0; ; file_offset++) {
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205 inb = getc(inf);
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
206 if (inb < 0)
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207 break;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
208 inb >>= right_shift;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
209 inb &= 3;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
210 byte_input(inb);
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
211 }
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
212 exit(0);
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
213 }