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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_DATA_BROADCAST_DESCRIPTOR
#define _UCSI_DVB_DATA_BROADCAST_DESCRIPTOR 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/descriptor.h>
#include <libucsi/endianops.h>
#include <libucsi/types.h>
/**
* dvb_data_broadcast_descriptor structure.
*/
struct dvb_data_broadcast_descriptor {
struct descriptor d;
uint16_t data_broadcast_id;
uint8_t component_tag;
uint8_t selector_length;
/* uint8_t selector[] */
/* struct dvb_data_broadcast_descriptor_part2 part2 */
} __ucsi_packed;
/**
* Second part of a dvb_data_broadcast_descriptor following the variable length selector field.
*/
struct dvb_data_broadcast_descriptor_part2 {
iso639lang_t language_code;
uint8_t text_length;
/* uint8_t text[] */
} __ucsi_packed;
/**
* Process a dvb_data_broadcast_descriptor.
*
* @param d Generic descriptor pointer.
* @return dvb_data_broadcast_descriptor pointer, or NULL on error.
*/
static inline struct dvb_data_broadcast_descriptor*
dvb_data_broadcast_descriptor_codec(struct descriptor* d)
{
struct dvb_data_broadcast_descriptor *p =
(struct dvb_data_broadcast_descriptor *) d;
struct dvb_data_broadcast_descriptor_part2 *p2;
uint8_t* buf = (uint8_t*) d + 2;
uint32_t pos = sizeof(struct dvb_data_broadcast_descriptor) - 2;
uint32_t len = d->len;
if (pos > len)
return NULL;
bswap16(buf + 2);
pos += p->selector_length;
if (pos > len)
return NULL;
p2 = (struct dvb_data_broadcast_descriptor_part2*) (buf + 2 + pos);
pos += sizeof(struct dvb_data_broadcast_descriptor_part2);
if (pos > len)
return NULL;
pos += p2->text_length;
if (pos != len)
return NULL;
return p;
}
/**
* Accessor for the selector field of a dvb_data_broadcast_descriptor.
*
* @param d dvb_data_broadcast_descriptor pointer.
* @return pointer to the field.
*/
static inline uint8_t *
dvb_data_broadcast_descriptor_selector(struct dvb_data_broadcast_descriptor *d)
{
return (uint8_t *) d + sizeof(struct dvb_data_broadcast_descriptor);
}
/**
* Accessor for the second part of a dvb_data_broadcast_descriptor.
*
* @param d dvb_data_broadcast_descriptor pointer.
* @return dvb_data_broadcast_descriptor_part2 pointer.
*/
static inline struct dvb_data_broadcast_descriptor_part2 *
dvb_data_broadcast_descriptor_part2(struct dvb_data_broadcast_descriptor *d)
{
return (struct dvb_data_broadcast_descriptor_part2*)
((uint8_t*) d + sizeof(struct dvb_data_broadcast_descriptor) +
d->selector_length);
}
/**
* Accessor for the text field in a dvb_data_broadcast_descriptor_part2.
*
* @param d dvb_data_broadcast_descriptor_part2 pointer.
* @return pointer to the field.
*/
static inline uint8_t *
dvb_data_broadcast_descriptor_part2_text(struct dvb_data_broadcast_descriptor_part2 *d)
{
return (uint8_t *) d + sizeof(struct dvb_data_broadcast_descriptor_part2);
}
#ifdef __cplusplus
}
#endif
#endif
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