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140 lines
3.7 KiB
140 lines
3.7 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_DATA_BROADCAST_DESCRIPTOR
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#define _UCSI_DVB_DATA_BROADCAST_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_data_broadcast_descriptor structure.
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*/
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struct dvb_data_broadcast_descriptor {
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struct descriptor d;
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uint16_t data_broadcast_id;
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uint8_t component_tag;
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uint8_t selector_length;
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/* uint8_t selector[] */
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/* struct dvb_data_broadcast_descriptor_part2 part2 */
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} __ucsi_packed;
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/**
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* Second part of a dvb_data_broadcast_descriptor following the variable length selector field.
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*/
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struct dvb_data_broadcast_descriptor_part2 {
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iso639lang_t language_code;
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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_data_broadcast_descriptor.
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*
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* @param d Generic descriptor pointer.
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* @return dvb_data_broadcast_descriptor pointer, or NULL on error.
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*/
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static inline struct dvb_data_broadcast_descriptor*
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dvb_data_broadcast_descriptor_codec(struct descriptor* d)
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{
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struct dvb_data_broadcast_descriptor *p =
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(struct dvb_data_broadcast_descriptor *) d;
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struct dvb_data_broadcast_descriptor_part2 *p2;
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uint8_t* buf = (uint8_t*) d + 2;
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uint32_t pos = sizeof(struct dvb_data_broadcast_descriptor) - 2;
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uint32_t len = d->len;
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if (pos > len)
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return NULL;
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bswap16(buf + 2);
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pos += p->selector_length;
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if (pos > len)
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return NULL;
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p2 = (struct dvb_data_broadcast_descriptor_part2*) (buf + 2 + pos);
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pos += sizeof(struct dvb_data_broadcast_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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* Accessor for the selector field of a dvb_data_broadcast_descriptor.
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*
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* @param d dvb_data_broadcast_descriptor 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_data_broadcast_descriptor_selector(struct dvb_data_broadcast_descriptor *d)
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{
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return (uint8_t *) d + sizeof(struct dvb_data_broadcast_descriptor);
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}
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/**
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* Accessor for the second part of a dvb_data_broadcast_descriptor.
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*
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* @param d dvb_data_broadcast_descriptor pointer.
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* @return dvb_data_broadcast_descriptor_part2 pointer.
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*/
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static inline struct dvb_data_broadcast_descriptor_part2 *
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dvb_data_broadcast_descriptor_part2(struct dvb_data_broadcast_descriptor *d)
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{
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return (struct dvb_data_broadcast_descriptor_part2*)
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((uint8_t*) d + sizeof(struct dvb_data_broadcast_descriptor) +
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d->selector_length);
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}
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/**
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* Accessor for the text field in a dvb_data_broadcast_descriptor_part2.
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*
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* @param d dvb_data_broadcast_descriptor_part2 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_data_broadcast_descriptor_part2_text(struct dvb_data_broadcast_descriptor_part2 *d)
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{
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return (uint8_t *) d + sizeof(struct dvb_data_broadcast_descriptor_part2);
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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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