1 /*
2 * section and descriptor parser
3 *
4 * Copyright (C) 2005 Andrew de Quincey (adq_dvb@lidskialf.net)
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
19 */
20
21 #include <string.h>
22 #include "libucsi/atsc/types.h"
23
24 /* GPS epoch == unix time_t at 06/Jan/1980 */
25 #define GPS_EPOCH 315964800
26
27
atsc_text_validate(uint8_t * buf,int len)28 int atsc_text_validate(uint8_t *buf, int len)
29 {
30 int i;
31 int j;
32 int number_strings;
33 int number_segments;
34 int number_bytes;
35 int pos = 0;
36
37 if (len == 0)
38 return 0;
39 number_strings = buf[pos];
40 pos++;
41
42 for(i=0; i< number_strings; i++) {
43 if (len < (pos+4))
44 return -1;
45 number_segments = buf[pos+3];
46 pos+=4;
47
48 for(j=0; j < number_segments; j++) {
49 if (len < (pos+3))
50 return -1;
51 number_bytes = buf[pos+2];
52 pos+=3;
53
54 if (len < (pos + number_bytes))
55 return -1;
56 pos += number_bytes;
57 }
58 }
59
60 return 0;
61 }
62
atsctime_to_unixtime(atsctime_t atsc)63 time_t atsctime_to_unixtime(atsctime_t atsc)
64 {
65 return atsc + GPS_EPOCH;
66 }
67
unixtime_to_atsctime(time_t t)68 atsctime_t unixtime_to_atsctime(time_t t)
69 {
70 return t - GPS_EPOCH;
71 }
72