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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/dccsct_section.h>
struct atsc_dccsct_section *atsc_dccsct_section_codec(struct atsc_section_psip *psip)
{
uint8_t * buf = (uint8_t *) psip;
size_t pos = 0;
size_t len = section_ext_length(&(psip->ext_head));
int idx;
if (len < sizeof(struct atsc_dccsct_section))
return NULL;
struct atsc_dccsct_section *dccsct = (struct atsc_dccsct_section *) psip;
pos += sizeof(struct atsc_dccsct_section);
for(idx =0; idx < dccsct->updates_defined; idx++) {
if (len < (pos + sizeof(struct atsc_dccsct_update)))
return NULL;
struct atsc_dccsct_update *update = (struct atsc_dccsct_update *) (buf+pos);
pos += sizeof(struct atsc_dccsct_update);
if (len < (pos + update->update_data_length))
return NULL;
switch(update->update_type) {
case ATSC_DCCST_UPDATE_NEW_GENRE: {
int sublen = sizeof(struct atsc_dccsct_update_new_genre);
if (update->update_data_length < sublen)
return NULL;
if (atsc_text_validate(buf+pos+sublen, update->update_data_length - sublen))
return NULL;
break;
}
case ATSC_DCCST_UPDATE_NEW_STATE: {
int sublen = sizeof(struct atsc_dccsct_update_new_state);
if (update->update_data_length < sublen)
return NULL;
if (atsc_text_validate(buf+pos+sublen, update->update_data_length - sublen))
return NULL;
break;
}
case ATSC_DCCST_UPDATE_NEW_COUNTY: {
int sublen = sizeof(struct atsc_dccsct_update_new_county);
if (update->update_data_length < sublen)
return NULL;
bswap16(buf+pos+1);
if (atsc_text_validate(buf+pos+sublen, update->update_data_length - sublen))
return NULL;
break;
}
}
pos += update->update_data_length;
if (len < (pos + sizeof(struct atsc_dccsct_update_part2)))
return NULL;
struct atsc_dccsct_update_part2 *part2 = (struct atsc_dccsct_update_part2 *) buf + pos;
bswap16(buf+pos);
pos += sizeof(struct atsc_dccsct_update_part2);
if (len < (pos + part2->descriptors_length))
return NULL;
if (verify_descriptors(buf + pos, part2->descriptors_length))
return NULL;
pos += part2->descriptors_length;
}
if (len < (pos + sizeof(struct atsc_dccsct_section_part2)))
return NULL;
struct atsc_dccsct_section_part2 *part2 = (struct atsc_dccsct_section_part2 *) (buf+pos);
bswap16(buf+pos);
pos += sizeof(struct atsc_dccsct_section_part2);
if (len < (pos + part2->descriptors_length))
return NULL;
if (verify_descriptors(buf + pos, part2->descriptors_length))
return NULL;
pos += part2->descriptors_length;
if (pos != len)
return NULL;
return (struct atsc_dccsct_section *) psip;
}
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