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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
*/
#ifndef _UCSI_DVB_EXTENDED_EVENT_DESCRIPTOR
#define _UCSI_DVB_EXTENDED_EVENT_DESCRIPTOR 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/descriptor.h>
#include <libucsi/endianops.h>
#include <libucsi/types.h>
/**
* 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
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