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comparison frtest/cvt-dlcap.c @ 139:be57e06bed84

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factor out common part of gsmfr-cvt-dlcap, in prep for EFR
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 13 Dec 2022 07:03:55 +0000
parents b7ea278390eb
children
comparison
equal deleted inserted replaced
138:68215020852b 139:be57e06bed84
1 /* 1 /*
2 * This program reads a TCH downlink capture produced with FreeCalypso tools 2 * This program reads a TCH/FS downlink capture produced with FreeCalypso tools
3 * (fw version with TCH downlink sniffing feature and fc-shell tch record) 3 * (fw version with TCH downlink sniffing feature and fc-shell tch record)
4 * and converts it into our extended-libgsm binary format, to be further 4 * and converts it into our extended-libgsm binary format, to be further
5 * fed to gsmfr-decode. 5 * fed to gsmfr-decode.
6 */ 6 */
7 7
8 #include <sys/types.h>
9 #include <ctype.h> 8 #include <ctype.h>
10 #include <stdio.h> 9 #include <stdio.h>
10 #include <stdint.h>
11 #include <stdlib.h> 11 #include <stdlib.h>
12 #include <string.h> 12 #include <string.h>
13 #include <strings.h> 13 #include <strings.h>
14
15 static
16 decode_hex_digit(ch)
17 {
18 if (isdigit(ch))
19 return(ch - '0');
20 else if (isupper(ch))
21 return(ch - 'A' + 10);
22 else
23 return(ch - 'a' + 10);
24 }
25
26 static
27 parse_classic_part(line, status_words, tidsp_bytes)
28 char *line;
29 u_short *status_words;
30 u_char *tidsp_bytes;
31 {
32 char *cp;
33 int i;
34
35 /* grok DSP status words */
36 cp = line;
37 for (i = 0; i < 3; i++) {
38 if (!isxdigit(cp[0]) || !isxdigit(cp[1]) ||
39 !isxdigit(cp[2]) || !isxdigit(cp[3]))
40 return -1;
41 status_words[i] = (decode_hex_digit(cp[0]) << 12) |
42 (decode_hex_digit(cp[1]) << 8) |
43 (decode_hex_digit(cp[2]) << 4) |
44 decode_hex_digit(cp[3]);
45 cp += 4;
46 if (*cp++ != ' ')
47 return -1;
48 }
49 /* read the frame bits */
50 for (i = 0; i < 33; i++) {
51 if (!isxdigit(cp[0]) || !isxdigit(cp[1]))
52 return -1;
53 tidsp_bytes[i] = (decode_hex_digit(cp[0]) << 4) |
54 decode_hex_digit(cp[1]);
55 cp += 2;
56 }
57 return 0;
58 }
59 14
60 main(argc, argv) 15 main(argc, argv)
61 char **argv; 16 char **argv;
62 { 17 {
63 FILE *inf, *outf; 18 FILE *inf, *outf;
64 char linebuf[128]; 19 char linebuf[128];
65 int lineno, rc; 20 int lineno, rc;
66 u_short status_words[3]; 21 uint16_t status_words[3];
67 u_char tidsp_bytes[33], libgsm_bytes[33], bfi[2]; 22 uint8_t tidsp_bytes[33], libgsm_bytes[33], bfi[2];
68 unsigned fn_mod_104; 23 unsigned fn_mod_104;
69 24
70 if (argc != 3) { 25 if (argc != 3) {
71 fprintf(stderr, "usage: %s infile outfile\n", argv[0]); 26 fprintf(stderr, "usage: %s infile outfile\n", argv[0]);
72 exit(1); 27 exit(1);
83 } 38 }
84 for (lineno = 1; fgets(linebuf, sizeof linebuf, inf); lineno++) { 39 for (lineno = 1; fgets(linebuf, sizeof linebuf, inf); lineno++) {
85 /* support both old and new formats */ 40 /* support both old and new formats */
86 if (isxdigit(linebuf[0]) && isxdigit(linebuf[1]) && 41 if (isxdigit(linebuf[0]) && isxdigit(linebuf[1]) &&
87 isxdigit(linebuf[2]) && isxdigit(linebuf[3])) { 42 isxdigit(linebuf[2]) && isxdigit(linebuf[3])) {
88 rc = parse_classic_part(linebuf, status_words, 43 rc = parse_dlcap_common(linebuf, status_words,
89 tidsp_bytes); 44 tidsp_bytes);
90 if (rc < 0) { 45 if (rc < 0) {
91 invalid: fprintf(stderr, 46 invalid: fprintf(stderr,
92 "error: %s is not in the expected format\n", 47 "error: %s is not in the expected format\n",
93 argv[1]); 48 argv[1]);
94 exit(1); 49 exit(1);
95 } 50 }
96 fn_mod_104 = 0; /* won't have TAF */ 51 fn_mod_104 = 0; /* won't have TAF */
97 } else if (!strncmp(linebuf, "FR ", 3)) { 52 } else if (!strncmp(linebuf, "FR ", 3)) {
98 rc = parse_classic_part(linebuf + 3, status_words, 53 rc = parse_dlcap_common(linebuf + 3, status_words,
99 tidsp_bytes); 54 tidsp_bytes);
100 if (rc < 0) 55 if (rc < 0)
101 goto invalid; 56 goto invalid;
102 if (linebuf[84] != ' ') 57 if (linebuf[84] != ' ')
103 goto invalid; 58 goto invalid;