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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/atsc/mgt_section.h>
struct atsc_mgt_section *atsc_mgt_section_codec(struct atsc_section_psip *psip)
{
uint8_t * buf = (uint8_t *) psip;
size_t pos = sizeof(struct atsc_section_psip);
size_t len = section_ext_length(&(psip->ext_head));
struct atsc_mgt_section *mgt = (struct atsc_mgt_section *) psip;
int i;
if (len < sizeof(struct atsc_mgt_section))
return NULL;
bswap16(buf + pos);
pos += 2;
// we cannot use the tables_defined value here because of the braindead ATSC spec!
for(i=0; i < mgt->tables_defined; i++) {
// we think we're still in the tables - process as normal
if ((pos + sizeof(struct atsc_mgt_table)) > len)
return NULL;
struct atsc_mgt_table *table = (struct atsc_mgt_table *) (buf+pos);
bswap16(buf+pos);
bswap16(buf+pos+2);
bswap32(buf+pos+5);
bswap16(buf+pos+9);
pos += sizeof(struct atsc_mgt_table);
if ((pos + table->table_type_descriptors_length) > len)
return NULL;
if (verify_descriptors(buf + pos, table->table_type_descriptors_length))
return NULL;
pos += table->table_type_descriptors_length;
}
if ((pos + sizeof(struct atsc_mgt_section_part2)) > len)
return NULL;
struct atsc_mgt_section_part2 *part2 = (struct atsc_mgt_section_part2 *) (buf+pos);
bswap16(buf+pos);
pos += sizeof(struct atsc_mgt_section_part2);
if ((pos + part2->descriptors_length) > len)
return NULL;
if (verify_descriptors(buf + pos, part2->descriptors_length))
return NULL;
pos += part2->descriptors_length;
if (pos != len)
return NULL;
return (struct atsc_mgt_section *) psip;
}
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