1 /*
2 * Copyright (c) 2013-2014 - Andre Roth <neolynx@gmail.com>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU Lesser General Public License as published by
6 * the Free Software Foundation version 2.1 of the License.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU Lesser General Public License for more details.
12 *
13 * You should have received a copy of the GNU Lesser General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
16 * Or, point your browser to http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
17 *
18 */
19
20 #include <libdvbv5/cat.h>
21 #include <libdvbv5/descriptors.h>
22 #include <libdvbv5/dvb-fe.h>
23
24 #if __GNUC__ >= 9
25 #pragma GCC diagnostic ignored "-Waddress-of-packed-member"
26 #endif
27
dvb_table_cat_init(struct dvb_v5_fe_parms * parms,const uint8_t * buf,ssize_t buflen,struct dvb_table_cat ** table)28 ssize_t dvb_table_cat_init(struct dvb_v5_fe_parms *parms, const uint8_t *buf,
29 ssize_t buflen, struct dvb_table_cat **table)
30 {
31 const uint8_t *p = buf, *endbuf = buf + buflen;
32 struct dvb_table_cat *cat;
33 struct dvb_desc **head_desc;
34 size_t size;
35
36 size = offsetof(struct dvb_table_cat, descriptor);
37 if (p + size > endbuf) {
38 dvb_logerr("%s: short read %zd/%zd bytes", __func__,
39 endbuf - p, size);
40 return -1;
41 }
42
43 if (buf[0] != DVB_TABLE_CAT) {
44 dvb_logerr("%s: invalid marker 0x%02x, should be 0x%02x",
45 __func__, buf[0], DVB_TABLE_CAT);
46 return -2;
47 }
48
49 if (!*table) {
50 *table = calloc(sizeof(struct dvb_table_cat), 1);
51 if (!*table) {
52 dvb_logerr("%s: out of memory", __func__);
53 return -3;
54 }
55 }
56 cat = *table;
57 memcpy(cat, p, size);
58 p += size;
59 dvb_table_header_init(&cat->header);
60
61 /* find end of current lists */
62 head_desc = &cat->descriptor;
63 while (*head_desc != NULL)
64 head_desc = &(*head_desc)->next;
65
66 size = cat->header.section_length + 3 - DVB_CRC_SIZE; /* plus header, minus CRC */
67 if (buf + size > endbuf) {
68 dvb_logerr("%s: short read %zd/%zd bytes", __func__,
69 endbuf - buf, size);
70 return -4;
71 }
72 endbuf = buf + size;
73
74 /* parse the descriptors */
75 if (endbuf > p) {
76 uint16_t desc_length = endbuf - p;
77 if (dvb_desc_parse(parms, p, desc_length,
78 head_desc) != 0) {
79 return -5;
80 }
81 p += desc_length;
82 }
83
84 if (endbuf - p)
85 dvb_logwarn("%s: %zu spurious bytes at the end",
86 __func__, endbuf - p);
87
88 return p - buf;
89 }
90
dvb_table_cat_free(struct dvb_table_cat * cat)91 void dvb_table_cat_free(struct dvb_table_cat *cat)
92 {
93 dvb_desc_free((struct dvb_desc **) &cat->descriptor);
94 free(cat);
95 }
96
dvb_table_cat_print(struct dvb_v5_fe_parms * parms,struct dvb_table_cat * cat)97 void dvb_table_cat_print(struct dvb_v5_fe_parms *parms, struct dvb_table_cat *cat)
98 {
99 dvb_loginfo("CAT");
100 dvb_table_header_print(parms, &cat->header);
101 dvb_desc_print(parms, cat->descriptor);
102 }
103
104