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/*
* Copyright (c) 2011-2012 - Mauro Carvalho Chehab
* Copyright (c) 2012-2014 - Andre Roth <neolynx@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation version 2.1 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
* Or, point your browser to http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
*
*/
#include <libdvbv5/nit.h>
#include <libdvbv5/dvb-fe.h>
#if __GNUC__ >= 9
#pragma GCC diagnostic ignored "-Waddress-of-packed-member"
#endif
ssize_t dvb_table_nit_init(struct dvb_v5_fe_parms *parms, const uint8_t *buf,
ssize_t buflen, struct dvb_table_nit **table)
{
const uint8_t *p = buf, *endbuf = buf + buflen;
struct dvb_table_nit *nit;
struct dvb_table_nit_transport **head;
struct dvb_desc **head_desc;
size_t size;
size = offsetof(struct dvb_table_nit, descriptor);
if (p + size > endbuf) {
dvb_logerr("%s: short read %zd/%zd bytes", __func__,
endbuf - p, size);
return -1;
}
if (buf[0] != DVB_TABLE_NIT && (buf[0] != DVB_TABLE_NIT2)) {
dvb_logerr("%s: invalid marker 0x%02x, should be 0x%02x or 0x%02x",
__func__, buf[0], DVB_TABLE_NIT, DVB_TABLE_NIT2);
return -2;
}
if (!*table) {
*table = calloc(sizeof(struct dvb_table_nit), 1);
if (!*table) {
dvb_logerr("%s: out of memory", __func__);
return -3;
}
}
nit = *table;
memcpy(nit, p, size);
p += size;
dvb_table_header_init(&nit->header);
bswap16(nit->bitfield);
/* find end of current lists */
head_desc = &nit->descriptor;
while (*head_desc != NULL)
head_desc = &(*head_desc)->next;
head = &nit->transport;
while (*head != NULL)
head = &(*head)->next;
size = nit->desc_length;
if (p + size > endbuf) {
dvb_logerr("%s: short read %zd/%zd bytes", __func__,
endbuf - p, size);
return -4;
}
if (dvb_desc_parse(parms, p, size, head_desc) != 0) {
return -5;
}
p += size;
size = sizeof(union dvb_table_nit_transport_header);
if (p + size > endbuf) {
dvb_logerr("%s: short read %zd/%zd bytes", __func__,
endbuf - p, size);
return -6;
}
p += size;
size = offsetof(struct dvb_table_nit_transport, descriptor);
while (p + size <= endbuf) {
struct dvb_table_nit_transport *transport;
transport = malloc(sizeof(struct dvb_table_nit_transport));
if (!transport) {
dvb_logerr("%s: out of memory", __func__);
return -7;
}
memcpy(transport, p, size);
p += size;
bswap16(transport->transport_id);
bswap16(transport->network_id);
bswap16(transport->bitfield);
transport->descriptor = NULL;
transport->next = NULL;
*head = transport;
head = &(*head)->next;
/* parse the descriptors */
if (transport->desc_length > 0) {
uint16_t desc_length = transport->desc_length;
if (p + desc_length > endbuf) {
dvb_logwarn("%s: descriptors short read %zd/%d bytes", __func__,
endbuf - p, desc_length);
desc_length = endbuf - p;
}
if (dvb_desc_parse(parms, p, desc_length,
&transport->descriptor) != 0) {
return -8;
}
p += desc_length;
}
}
if (endbuf - p)
dvb_logwarn("%s: %zu spurious bytes at the end",
__func__, endbuf - p);
return p - buf;
}
void dvb_table_nit_free(struct dvb_table_nit *nit)
{
struct dvb_table_nit_transport *transport = nit->transport;
dvb_desc_free(&nit->descriptor);
while (transport) {
dvb_desc_free(&transport->descriptor);
struct dvb_table_nit_transport *tmp = transport;
transport = transport->next;
free(tmp);
}
free(nit);
}
void dvb_table_nit_print(struct dvb_v5_fe_parms *parms, struct dvb_table_nit *nit)
{
const struct dvb_table_nit_transport *transport = nit->transport;
uint16_t transports = 0;
dvb_loginfo("NIT");
dvb_table_header_print(parms, &nit->header);
dvb_loginfo("| desc_length %d", nit->desc_length);
dvb_desc_print(parms, nit->descriptor);
while (transport) {
dvb_loginfo("|- transport %04x network %04x", transport->transport_id, transport->network_id);
dvb_desc_print(parms, transport->descriptor);
transport = transport->next;
transports++;
}
dvb_loginfo("|_ %d transports", transports);
}
void dvb_table_nit_descriptor_handler(
struct dvb_v5_fe_parms *parms,
struct dvb_table_nit *nit,
enum descriptors descriptor,
nit_handler_callback_t *call_nit,
nit_tran_handler_callback_t *call_tran,
void *priv)
{
if (call_nit || parms->verbose) {
dvb_desc_find(struct dvb_desc, desc, nit,
descriptor) {
if (call_nit)
call_nit(nit, desc, priv);
else
dvb_logwarn("descriptor %s found on NIT but unhandled",
dvb_descriptors[descriptor].name);
}
}
if (!call_tran && !parms->verbose)
return;
dvb_nit_transport_foreach(tran, nit) {
dvb_desc_find(struct dvb_desc, desc, tran,
descriptor) {
if (call_tran)
call_tran(nit, tran, desc, priv);
else
dvb_logwarn("descriptor %s found on NIT transport but unhandled",
dvb_descriptors[descriptor].name);
}
}
}
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