/* * 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 */ #ifndef _UCSI_DVB_EXTENDED_EVENT_DESCRIPTOR #define _UCSI_DVB_EXTENDED_EVENT_DESCRIPTOR 1 #ifdef __cplusplus extern "C" { #endif #include #include #include /** * dvb_extended_event_descriptor structure. */ struct dvb_extended_event_descriptor { struct descriptor d; EBIT2(uint8_t descriptor_number : 4; , uint8_t last_descriptor_number : 4; ) iso639lang_t language_code; uint8_t length_of_items; /* struct dvb_extended_event_item items[] */ /* struct dvb_extended_event_descriptor_part2 part2 */ } __ucsi_packed; /** * An entry in the items field of a dvb_extended_event_descriptor. */ struct dvb_extended_event_item { uint8_t item_description_length; /* uint8_t item_description[] */ /* struct dvb_extended_event_item_part2 part2 */ } __ucsi_packed; /** * The second part of a dvb_extended_event_item, following the variable length * description field. */ struct dvb_extended_event_item_part2 { uint8_t item_length; /* uint8_t item[] */ } __ucsi_packed; /** * The second part of a dvb_extended_event_descriptor, following the variable * length items field. */ struct dvb_extended_event_descriptor_part2 { uint8_t text_length; /* uint8_t text[] */ } __ucsi_packed; /** * Process a dvb_extended_event_descriptor. * * @param d Generic descriptor structure. * @return dvb_extended_event_descriptor pointer, or NULL on error. */ static inline struct dvb_extended_event_descriptor* dvb_extended_event_descriptor_codec(struct descriptor* d) { uint8_t* buf = (uint8_t*) d + 2; uint32_t pos = 0; uint32_t len = d->len; struct dvb_extended_event_descriptor * p = (struct dvb_extended_event_descriptor *) d; struct dvb_extended_event_descriptor_part2 *p2; pos += sizeof(struct dvb_extended_event_descriptor) - 2; if (pos > len) return NULL; pos += p->length_of_items; if (pos > len) return NULL; p2 = (struct dvb_extended_event_descriptor_part2*) (buf+pos); pos += sizeof(struct dvb_extended_event_descriptor_part2); if (pos > len) return NULL; pos += p2->text_length; if (pos != len) return NULL; return p; } /** * Iterator for the items field of a dvb_extended_event_descriptor. * * @param d dvb_extended_event_descriptor pointer. * @param pos Variable containing a pointer to the current dvb_extended_event_item. */ #define dvb_extended_event_descriptor_items_for_each(d, pos) \ for ((pos) = dvb_extended_event_descriptor_items_first(d); \ (pos); \ (pos) = dvb_extended_event_descriptor_items_next(d, pos)) /** * Accessor for the description field of a dvb_extended_event_item. * * @param d dvb_extended_event_item pointer. * @return Pointer to the field. */ static inline uint8_t* dvb_extended_event_item_description(struct dvb_extended_event_item *d) { return (uint8_t*) d + sizeof(struct dvb_extended_event_item); } /** * Accessor for the second part of a dvb_extended_event_item. * * @param dvb_extended_event_item pointer. * @return dvb_extended_event_item_part2 pointer. */ static inline struct dvb_extended_event_item_part2* dvb_extended_event_item_part2(struct dvb_extended_event_item *d) { return (struct dvb_extended_event_item_part2*) ((uint8_t*) d + sizeof(struct dvb_extended_event_item) + d->item_description_length); } /** * Accessor for the item field of a dvb_extended_event_item_part2. * * @param d dvb_extended_event_item_part2 pointer. * @return Pointer to the item field. */ static inline uint8_t* dvb_extended_event_item_part2_item(struct dvb_extended_event_item_part2 *d) { return (uint8_t*) d + sizeof(struct dvb_extended_event_item_part2); } /** * Accessor for the second part of a dvb_extended_event_descriptor. * * @param d dvb_extended_event_descriptor pointer. * @return dvb_extended_event_descriptor_part2 pointer. */ static inline struct dvb_extended_event_descriptor_part2* dvb_extended_event_descriptor_part2(struct dvb_extended_event_descriptor *d) { return (struct dvb_extended_event_descriptor_part2*) ((uint8_t*) d + sizeof(struct dvb_extended_event_descriptor) + d->length_of_items); } /** * Accessor for the text field of an dvb_extended_event_descriptor_part2. * * @param d dvb_extended_event_descriptor_part2 pointer. * @return Pointer to the text field. */ static inline uint8_t* dvb_extended_event_descriptor_part2_text(struct dvb_extended_event_descriptor_part2 *d) { return (uint8_t*) ((uint8_t*) d + sizeof(struct dvb_extended_event_descriptor_part2)); } /******************************** PRIVATE CODE ********************************/ static inline struct dvb_extended_event_item* dvb_extended_event_descriptor_items_first(struct dvb_extended_event_descriptor *d) { if (d->length_of_items == 0) return NULL; return (struct dvb_extended_event_item *) ((uint8_t*) d + sizeof(struct dvb_extended_event_descriptor)); } static inline struct dvb_extended_event_item* dvb_extended_event_descriptor_items_next(struct dvb_extended_event_descriptor *d, struct dvb_extended_event_item *pos) { struct dvb_extended_event_item_part2* part2 = dvb_extended_event_item_part2(pos); uint8_t *end = (uint8_t*) d + sizeof(struct dvb_extended_event_descriptor) + d->length_of_items; uint8_t *next = (uint8_t *) part2 + sizeof(struct dvb_extended_event_item_part2) + part2->item_length; if (next >= end) return NULL; return (struct dvb_extended_event_item *) next; } #ifdef __cplusplus } #endif #endif