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233 lines
6.2 KiB
233 lines
6.2 KiB
/*
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* section and descriptor parser
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*
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* Copyright (C) 2005 Kenneth Aafloy (kenneth@linuxtv.org)
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* Copyright (C) 2005 Andrew de Quincey (adq_dvb@lidskialf.net)
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#ifndef _UCSI_DVB_EXTENDED_EVENT_DESCRIPTOR
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#define _UCSI_DVB_EXTENDED_EVENT_DESCRIPTOR 1
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#include <libucsi/descriptor.h>
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#include <libucsi/endianops.h>
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#include <libucsi/types.h>
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/**
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* dvb_extended_event_descriptor structure.
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*/
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struct dvb_extended_event_descriptor {
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struct descriptor d;
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EBIT2(uint8_t descriptor_number : 4; ,
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uint8_t last_descriptor_number : 4; );
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iso639lang_t language_code;
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uint8_t length_of_items;
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/* struct dvb_extended_event_item items[] */
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/* struct dvb_extended_event_descriptor_part2 part2 */
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} __ucsi_packed;
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/**
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* An entry in the items field of a dvb_extended_event_descriptor.
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*/
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struct dvb_extended_event_item {
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uint8_t item_description_length;
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/* uint8_t item_description[] */
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/* struct dvb_extended_event_item_part2 part2 */
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} __ucsi_packed;
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/**
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* The second part of a dvb_extended_event_item, following the variable length
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* description field.
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*/
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struct dvb_extended_event_item_part2 {
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uint8_t item_length;
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/* uint8_t item[] */
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} __ucsi_packed;
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/**
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* The second part of a dvb_extended_event_descriptor, following the variable
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* length items field.
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*/
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struct dvb_extended_event_descriptor_part2 {
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uint8_t text_length;
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/* uint8_t text[] */
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} __ucsi_packed;
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/**
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* Process a dvb_extended_event_descriptor.
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*
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* @param d Generic descriptor structure.
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* @return dvb_extended_event_descriptor pointer, or NULL on error.
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*/
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static inline struct dvb_extended_event_descriptor*
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dvb_extended_event_descriptor_codec(struct descriptor* d)
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{
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uint8_t* buf = (uint8_t*) d + 2;
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uint32_t pos = 0;
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uint32_t len = d->len;
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struct dvb_extended_event_descriptor * p =
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(struct dvb_extended_event_descriptor *) d;
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struct dvb_extended_event_descriptor_part2 *p2;
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pos += sizeof(struct dvb_extended_event_descriptor) - 2;
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if (pos > len)
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return NULL;
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pos += p->length_of_items;
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if (pos > len)
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return NULL;
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p2 = (struct dvb_extended_event_descriptor_part2*) (buf+pos);
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pos += sizeof(struct dvb_extended_event_descriptor_part2);
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if (pos > len)
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return NULL;
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pos += p2->text_length;
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if (pos != len)
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return NULL;
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return p;
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}
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/**
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* Iterator for the items field of a dvb_extended_event_descriptor.
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*
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* @param d dvb_extended_event_descriptor pointer.
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* @param pos Variable containing a pointer to the current dvb_extended_event_item.
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*/
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#define dvb_extended_event_descriptor_items_for_each(d, pos) \
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for ((pos) = dvb_extended_event_descriptor_items_first(d); \
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(pos); \
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(pos) = dvb_extended_event_descriptor_items_next(d, pos))
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/**
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* Accessor for the description field of a dvb_extended_event_item.
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*
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* @param d dvb_extended_event_item pointer.
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* @return Pointer to the field.
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*/
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static inline uint8_t*
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dvb_extended_event_item_description(struct dvb_extended_event_item *d)
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{
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return (uint8_t*) d + sizeof(struct dvb_extended_event_item);
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}
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/**
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* Accessor for the second part of a dvb_extended_event_item.
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*
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* @param dvb_extended_event_item pointer.
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* @return dvb_extended_event_item_part2 pointer.
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*/
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static inline struct dvb_extended_event_item_part2*
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dvb_extended_event_item_part2(struct dvb_extended_event_item *d)
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{
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return (struct dvb_extended_event_item_part2*)
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((uint8_t*) d + sizeof(struct dvb_extended_event_item) +
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d->item_description_length);
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}
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/**
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* Accessor for the item field of a dvb_extended_event_item_part2.
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*
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* @param d dvb_extended_event_item_part2 pointer.
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* @return Pointer to the item field.
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*/
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static inline uint8_t*
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dvb_extended_event_item_part2_item(struct dvb_extended_event_item_part2 *d)
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{
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return (uint8_t*) d + sizeof(struct dvb_extended_event_item_part2);
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}
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/**
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* Accessor for the second part of a dvb_extended_event_descriptor.
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*
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* @param d dvb_extended_event_descriptor pointer.
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* @return dvb_extended_event_descriptor_part2 pointer.
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*/
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static inline struct dvb_extended_event_descriptor_part2*
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dvb_extended_event_descriptor_part2(struct dvb_extended_event_descriptor *d)
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{
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return (struct dvb_extended_event_descriptor_part2*)
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((uint8_t*) d + sizeof(struct dvb_extended_event_descriptor) +
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d->length_of_items);
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}
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/**
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* Accessor for the text field of an dvb_extended_event_descriptor_part2.
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*
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* @param d dvb_extended_event_descriptor_part2 pointer.
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* @return Pointer to the text field.
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*/
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static inline uint8_t*
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dvb_extended_event_descriptor_part2_text(struct dvb_extended_event_descriptor_part2 *d)
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{
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return (uint8_t*)
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((uint8_t*) d + sizeof(struct dvb_extended_event_descriptor_part2));
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}
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/******************************** PRIVATE CODE ********************************/
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static inline struct dvb_extended_event_item*
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dvb_extended_event_descriptor_items_first(struct dvb_extended_event_descriptor *d)
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{
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if (d->length_of_items == 0)
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return NULL;
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return (struct dvb_extended_event_item *)
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((uint8_t*) d + sizeof(struct dvb_extended_event_descriptor));
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}
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static inline struct dvb_extended_event_item*
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dvb_extended_event_descriptor_items_next(struct dvb_extended_event_descriptor *d,
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struct dvb_extended_event_item *pos)
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{
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struct dvb_extended_event_item_part2* part2 =
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dvb_extended_event_item_part2(pos);
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uint8_t *end = (uint8_t*) d + sizeof(struct dvb_extended_event_descriptor) + d->length_of_items;
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uint8_t *next = (uint8_t *) part2 +
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sizeof(struct dvb_extended_event_item_part2) +
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part2->item_length;
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if (next >= end)
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return NULL;
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return (struct dvb_extended_event_item *) next;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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