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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_MULTILINGUAL_COMPONENT_DESCRIPTOR
#define _UCSI_DVB_MULTILINGUAL_COMPONENT_DESCRIPTOR 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/descriptor.h>
#include <libucsi/endianops.h>
#include <libucsi/types.h>
/**
* dvb_multilingual_component_descriptor structure.
*/
struct dvb_multilingual_component_descriptor {
struct descriptor d;
uint8_t component_tag;
/* struct dvb_multilingual_component components[] */
} __ucsi_packed;
/**
* An entry in the components field of a dvb_multilingual_component_descriptor.
*/
struct dvb_multilingual_component {
iso639lang_t language_code;
uint8_t text_description_length;
/* uint8_t text_char[] */
} __ucsi_packed;
/**
* Process a dvb_multilingual_component_descriptor.
*
* @param d Generic descriptor pointer.
* @return dvb_multilingual_component_descriptor pointer, or NULL on error.
*/
static inline struct dvb_multilingual_component_descriptor*
dvb_multilingual_component_descriptor_codec(struct descriptor* d)
{
uint8_t* buf = (uint8_t*) d + 2;
uint32_t pos = sizeof(struct dvb_multilingual_component_descriptor) - 2;
uint32_t len = d->len;
if (pos > len)
return NULL;
while(pos < len) {
struct dvb_multilingual_component *e =
(struct dvb_multilingual_component*) (buf+pos);
pos += sizeof(struct dvb_multilingual_component);
if (pos > len)
return NULL;
pos += e->text_description_length;
if (pos > len)
return NULL;
}
return (struct dvb_multilingual_component_descriptor*) d;
}
/**
* Iterator for entries in the components field of a dvb_multilingual_component_descriptor.
*
* @param d Generic descriptor pointer.
* @param pos Variable containing a pointer to the current dvb_multilingual_component.
*/
#define dvb_multilingual_component_descriptor_components_for_each(d, pos) \
for ((pos) = dvb_multilingual_component_descriptor_components_first(d); \
(pos); \
(pos) = dvb_multilingual_component_descriptor_components_next(d, pos))
/**
* Accessor for the text_char field in a dvb_multilingual_component.
*
* @param e dvb_multilingual_component pointer.
* @return Pointer to the field.
*/
static inline uint8_t *
dvb_multilingual_component_text_char(struct dvb_multilingual_component *e)
{
return (uint8_t *) e + sizeof(struct dvb_multilingual_component);
}
/******************************** PRIVATE CODE ********************************/
static inline struct dvb_multilingual_component*
dvb_multilingual_component_descriptor_components_first(struct dvb_multilingual_component_descriptor *d)
{
if (d->d.len == 1)
return NULL;
return (struct dvb_multilingual_component *)
((uint8_t*) d + sizeof(struct dvb_multilingual_component_descriptor));
}
static inline struct dvb_multilingual_component*
dvb_multilingual_component_descriptor_components_next(struct dvb_multilingual_component_descriptor *d,
struct dvb_multilingual_component *pos)
{
uint8_t *end = (uint8_t*) d + 2 + d->d.len;
uint8_t *next = (uint8_t *) pos +
sizeof(struct dvb_multilingual_component) +
pos->text_description_length;
if (next >= end)
return NULL;
return (struct dvb_multilingual_component *) next;
}
#ifdef __cplusplus
}
#endif
#endif
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