/* * 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 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; } -1&id=f5a002e361636dd41dc84a5fa1a2e1ee77862edb'>plain)