+
−/*
+
− * This program reads a TCH/FS downlink capture produced with FreeCalypso tools
+
− * (fw version with TCH downlink sniffing feature and fc-shell tch record),
+
− * parses the frame bits according to our current understanding, and dumps
+
− * everything in human-readable form for further analysis.
+
− */
+
−
+
−#include <ctype.h>
+
−#include <stdio.h>
+
−#include <stdint.h>
+
−#include <stdlib.h>
+
−#include <string.h>
+
−#include <strings.h>
+
−#include "../libgsmfr2/tw_gsmfr.h"
+
−
+
−static void
+
−process_record(lineno, fn_mod_104, status_words, tidsp_bytes)
+
−	int lineno;
+
−	unsigned fn_mod_104;
+
−	uint16_t *status_words;
+
−	uint8_t *tidsp_bytes;
+
−{
+
−	uint8_t libgsm_bytes[33];
+
−	int16_t params[76];
+
−	int i, j, n;
+
−
+
−	printf("#%d: fn=%u DSP %04X %04X %04X\n", lineno, fn_mod_104,
+
−		status_words[0], status_words[1], status_words[2]);
+
−	gsm0610_tidsp_to_libgsm(tidsp_bytes, libgsm_bytes);
+
−	fputs("  bits ", stdout);
+
−	for (i = 0; i < 33; i++)
+
−		printf("%02X", tidsp_bytes[i]);
+
−	printf(" SID=%d\n", gsmfr_preproc_sid_classify(libgsm_bytes));
+
−	gsmfr_unpack_to_array(libgsm_bytes, params);
+
−	fputs("  FR", stdout);
+
−	n = 0;
+
−	for (i = 0; i < 8; i++)
+
−		printf(" %d", params[n++]);
+
−	putchar('\n');
+
−	for (i = 0; i < 4; i++) {
+
−		putchar(' ');
+
−		for (j = 0; j < 17; j++)
+
−			printf(" %d", params[n++]);
+
−		putchar('\n');
+
−	}
+
−}
+
−
+
−main(argc, argv)
+
−	char **argv;
+
−{
+
−	FILE *inf;
+
−	char linebuf[128];
+
−	int lineno, rc;
+
−	uint16_t status_words[3];
+
−	uint8_t tidsp_bytes[33];
+
−	unsigned fn_mod_104;
+
−
+
−	if (argc != 2) {
+
−		fprintf(stderr, "usage: %s dlcap-file\n", argv[0]);
+
−		exit(1);
+
−	}
+
−	inf = fopen(argv[1], "r");
+
−	if (!inf) {
+
−		perror(argv[1]);
+
−		exit(1);
+
−	}
+
−	for (lineno = 1; fgets(linebuf, sizeof linebuf, inf); lineno++) {
+
−		/* support both old and new formats */
+
−		if (isxdigit(linebuf[0]) && isxdigit(linebuf[1]) &&
+
−		    isxdigit(linebuf[2]) && isxdigit(linebuf[3])) {
+
−			/* also support parsing output from fc-vm2hex */
+
−			if (linebuf[4] == '\n') {
+
−				printf("#%d: fn=0 DSP %.4s\n", lineno, linebuf);
+
−				continue;
+
−			}
+
−			rc = parse_dlcap_common(linebuf, status_words,
+
−						tidsp_bytes);
+
−			if (rc < 0) {
+
−invalid:			fprintf(stderr,
+
−				"error: %s is not in the expected format\n",
+
−					argv[1]);
+
−				exit(1);
+
−			}
+
−			fn_mod_104 = 0;		/* won't have TAF */
+
−		} else if (!strncmp(linebuf, "FR ", 3)) {
+
−			rc = parse_dlcap_common(linebuf + 3, status_words,
+
−						tidsp_bytes);
+
−			if (rc < 0)
+
−				goto invalid;
+
−			if (linebuf[84] != ' ')
+
−				goto invalid;
+
−			if (!isdigit(linebuf[85]))
+
−				goto invalid;
+
−			fn_mod_104 = strtoul(linebuf + 85, 0, 10);
+
−		} else
+
−			goto invalid;
+
−		process_record(lineno, fn_mod_104, status_words, tidsp_bytes);
+
−	}
+
−	exit(0);
+
−}