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/*
* section and descriptor parser
*
* Copyright (C) 2005 Kenneth Aafloy (kenneth@linuxtv.org)
* Copyright (C) 2005 Andrew de Quincey (adq_dvb@lidskialf.net)
*
* This library 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; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <libucsi/dvb/nit_section.h>
struct dvb_nit_section *dvb_nit_section_codec(struct section_ext * ext)
{
uint8_t * buf = (uint8_t *) ext;
struct dvb_nit_section * ret = (struct dvb_nit_section *) ext;
size_t pos = sizeof(struct section_ext);
size_t len = section_ext_length(ext);
if (len < sizeof(struct dvb_nit_section))
return NULL;
bswap16(buf + pos);
pos += 2;
if ((pos + ret->network_descriptors_length) > len)
return NULL;
if (verify_descriptors(buf + pos, ret->network_descriptors_length))
return NULL;
pos += ret->network_descriptors_length;
if ((pos + sizeof(struct dvb_nit_section_part2)) > len)
return NULL;
bswap16(buf + pos);
pos += 2;
while (pos < len) {
struct dvb_nit_transport *transport =
(struct dvb_nit_transport *)(buf + pos);
if ((pos + sizeof(struct dvb_nit_transport)) > len)
return NULL;
bswap16(buf + pos);
bswap16(buf + pos + 2);
bswap16(buf + pos + 4);
pos += sizeof(struct dvb_nit_transport);
if ((pos + transport->transport_descriptors_length) > len)
return NULL;
if (verify_descriptors(buf + pos,
transport->transport_descriptors_length))
return NULL;
pos += transport->transport_descriptors_length;
}
if (pos != len)
return NULL;
return ret;
}
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