FreeCalypso > hg > gsm-net-reveng

comparison trau-decode/parse-data.c @ 77:729dbac9df82

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
trau-decode: factor out parse-data.c
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 08 Feb 2025 05:16:35 +0000
parents trau-decode/parse-main.c@d4ee42801cdc
children
comparison
equal deleted inserted replaced
76:d4ee42801cdc 77:729dbac9df82
1 /*
2 * This module contains a bit of code that has been factored out of
3 * trau-parse program; it handles data frames.
4 */
5
6 #include <stdio.h>
7 #include <stdint.h>
8 #include <stdlib.h>
9 #include <string.h>
10 #include <strings.h>
11
12 static unsigned
13 bits_to_num(bits, nbits)
14 uint8_t *bits;
15 unsigned nbits;
16 {
17 unsigned accum;
18 unsigned n;
19
20 accum = 0;
21 for (n = 0; n < nbits; n++) {
22 accum <<= 1;
23 if (*bits)
24 accum |= 1;
25 bits++;
26 }
27 return accum;
28 }
29
30 static void
31 print_data_subframe(nf, bits)
32 uint8_t *bits;
33 {
34 unsigned nb;
35
36 printf(" Data frame %d:", nf);
37 for (nb = 0; nb < 9; nb++) {
38 printf(" %02X", bits_to_num(bits, 8));
39 bits += 8;
40 }
41 putchar('\n');
42 }
43
44 void
45 print_data_frame(frame_bits)
46 uint8_t *frame_bits;
47 {
48 printf(" C6-C15: %u%u%u%u%u%u%u%u%u%u\n", frame_bits[22],
49 frame_bits[23], frame_bits[24], frame_bits[25],
50 frame_bits[26], frame_bits[27], frame_bits[28],
51 frame_bits[29], frame_bits[30], frame_bits[31]);
52 print_data_subframe(0, frame_bits + 4 * 8);
53 print_data_subframe(1, frame_bits + 13 * 8);
54 print_data_subframe(2, frame_bits + 22 * 8);
55 print_data_subframe(3, frame_bits + 31 * 8);
56 }
57
58 void
59 print_edata_frame(frame_bits)
60 uint8_t *frame_bits;
61 {
62 printf(" C6-C13: %u%u%u%u%u%u%u%u\n", frame_bits[22],
63 frame_bits[23], frame_bits[24], frame_bits[25],
64 frame_bits[26], frame_bits[27], frame_bits[28],
65 frame_bits[29]);
66 printf(" M1=%u M2=%u\n", frame_bits[30], frame_bits[31]);
67 }