struct atsc_tvct_section *atsc_tvct_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));
int idx;
struct atsc_tvct_section *tvct = (struct atsc_tvct_section *) psip;
if (len < sizeof(struct atsc_tvct_section))
return NULL;
pos++;
for(idx =0; idx < tvct->num_channels_in_section; idx++) {
if ((pos + sizeof(struct atsc_tvct_channel)) > len)
return NULL;
struct atsc_tvct_channel *channel = (struct atsc_tvct_channel *) (buf+pos);
pos += 7*2;
bswap32(buf+pos);
bswap32(buf+pos+4);
bswap16(buf+pos+8);
bswap16(buf+pos+10);
bswap16(buf+pos+12);
bswap16(buf+pos+14);
bswap16(buf+pos+16);
pos+=18;
if ((pos + channel->descriptors_length) > len)
return NULL;
if (verify_descriptors(buf + pos, channel->descriptors_length))
return NULL;
pos += channel->descriptors_length;
}
if ((pos + sizeof(struct atsc_tvct_section_part2)) > len)
return NULL;
struct atsc_tvct_section_part2 *part2 = (struct atsc_tvct_section_part2 *) (buf+pos);
bswap16(buf+pos);
pos+=2;
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_tvct_section *) psip;
}
struct mpeg_odsmt_section *mpeg_odsmt_section_codec(struct section_ext * ext)
{
struct mpeg_odsmt_section * odsmt = (struct mpeg_odsmt_section *)ext;
uint8_t * buf = (uint8_t *)ext;
size_t pos = sizeof(struct section_ext);
size_t len = section_ext_length(ext);
int i;
if (len < sizeof(struct mpeg_odsmt_section))
return NULL;
pos++;
if (odsmt->stream_count == 0) {
struct mpeg_odsmt_stream * stream =
(struct mpeg_odsmt_stream *) (buf + pos);
if ((pos + sizeof(struct mpeg_odsmt_stream_single)) > len)
return NULL;
bswap16(buf+pos);
pos+=3;
if ((pos + stream->u.single.es_info_length) >= len)
return NULL;
if (verify_descriptors(buf + pos, stream->u.single.es_info_length))
return NULL;
pos += stream->u.single.es_info_length;
} else {
for (i=0; i< odsmt->stream_count; i++) {
struct mpeg_odsmt_stream * stream =
(struct mpeg_odsmt_stream *)(buf + pos);
if ((pos + sizeof(struct mpeg_odsmt_stream_multi)) > len)
return NULL;
bswap16(buf+pos);
pos += sizeof(struct mpeg_odsmt_stream_multi);
if ((pos + stream->u.multi.es_info_length) > len)
return NULL;
if (verify_descriptors(buf + pos,
stream->u.multi.es_info_length))
return NULL;
pos += stream->u.multi.es_info_length;
}
}
if (pos != len)
return NULL;
return (struct mpeg_odsmt_section *) ext;
}
struct atsc_ett_section *atsc_ett_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));
if (len < sizeof(struct atsc_ett_section))
return NULL;
bswap32(buf + pos);
pos += 4;
if (atsc_text_validate(buf + pos,
section_ext_length(&psip->ext_head) - sizeof(struct atsc_ett_section)))
return NULL;
return (struct atsc_ett_section *) psip;
}
struct dvb_tva_container_section *dvb_tva_container_section_codec(struct section_ext *ext)
{
size_t len = section_ext_length(ext);
struct dvb_tva_container_section* ret = (struct dvb_tva_container_section*) ext;
if (len < sizeof(struct dvb_tva_container_section))
return NULL;
return ret;
}
struct dvb_int_section * dvb_int_section_codec(struct section_ext *ext)
{
uint8_t *buf = (uint8_t *) ext;
struct dvb_int_section *in = (struct dvb_int_section *) ext;
size_t pos = sizeof(struct section_ext);
size_t len = section_ext_length(ext);
if (len < sizeof(struct dvb_int_section))
return NULL;
bswap32(buf+8);
bswap16(buf+12);
pos += 6;
if (len - pos < in->platform_descriptors_length)
return NULL;
if (verify_descriptors(buf + pos, in->platform_descriptors_length))
return NULL;
pos += in->platform_descriptors_length;
while (pos < len) {
struct dvb_int_target *s2 = (struct dvb_int_target *) (buf + pos);
struct dvb_int_operational_loop *s3;
bswap16(buf + pos); /* target_descriptor_loop_length swap */
if (len - pos < s2->target_descriptors_length)
return NULL;
pos += sizeof(struct dvb_int_target);
if (verify_descriptors(buf + pos, s2->target_descriptors_length))
return NULL;
pos += s2->target_descriptors_length;
s3 = (struct dvb_int_operational_loop *) (buf + pos);
bswap16(buf + pos); /* operational_descriptor_loop_length swap */
if (len - pos < s3->operational_descriptors_length)
return NULL;
pos += sizeof(struct dvb_int_operational_loop);
if (verify_descriptors(buf + pos, s3->operational_descriptors_length))
return NULL;
pos += s3->operational_descriptors_length;
}
return (struct dvb_int_section *) ext;
}
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;
}
struct mpeg_tsdt_section * mpeg_tsdt_section_codec(struct section_ext * ext)
{
uint8_t * buf = (uint8_t *)ext;
size_t pos = sizeof(struct section_ext);
if (verify_descriptors(buf + pos,
section_ext_length(ext) - sizeof(struct mpeg_tsdt_section)))
return NULL;
return (struct mpeg_tsdt_section *)ext;
}
struct atsc_eit_section *atsc_eit_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_eit_section))
return NULL;
struct atsc_eit_section *eit = (struct atsc_eit_section *) psip;
pos += sizeof(struct atsc_eit_section);
for(idx =0; idx < eit->num_events_in_section; idx++) {
if (len < (pos + sizeof(struct atsc_eit_event)))
return NULL;
struct atsc_eit_event *event = (struct atsc_eit_event *) (buf+pos);
bswap16(buf+pos);
bswap32(buf+pos+2);
bswap32(buf+pos+6);
pos += sizeof(struct atsc_eit_event);
if (len < (pos + event->title_length))
return NULL;
if (atsc_text_validate(buf+pos, event->title_length))
return NULL;
pos += event->title_length;
if (len < (pos + sizeof(struct atsc_eit_event_part2)))
return NULL;
struct atsc_eit_event_part2 *part2 = (struct atsc_eit_event_part2 *) (buf+pos);
bswap16(buf+pos);
pos += sizeof(struct atsc_eit_event_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_eit_section *) psip;
}
struct atsc_stt_section *atsc_stt_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));
if (len < sizeof(struct atsc_stt_section))
return NULL;
bswap32(buf + pos);
pos += 5;
bswap16(buf + pos);
pos += 2;
if (verify_descriptors(buf + pos, len - sizeof(struct atsc_stt_section)))
return NULL;
return (struct atsc_stt_section *) psip;
}
struct dvb_sdt_section * dvb_sdt_section_codec(struct section_ext * ext)
{
uint8_t * buf = (uint8_t *) ext;
size_t pos = sizeof(struct section_ext);
size_t len = section_ext_length(ext);
if (len < sizeof(struct dvb_sdt_section))
return NULL;
bswap16(buf + pos);
pos += 3;
while (pos < len) {
struct dvb_sdt_service * service =
(struct dvb_sdt_service *)(buf + pos);
if ((pos + sizeof(struct dvb_sdt_service)) > len)
return NULL;
bswap16(buf + pos);
bswap16(buf + pos + 3);
pos += sizeof(struct dvb_sdt_service);
if ((pos + service->descriptors_loop_length) > len)
return NULL;
if (verify_descriptors(buf + pos, service->descriptors_loop_length))
return NULL;
pos += service->descriptors_loop_length;
}
if (pos != len)
return NULL;
return (struct dvb_sdt_section *) ext;
}
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;
}
