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128 lines
3.4 KiB
128 lines
3.4 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_LOCAL_TIME_OFFSET_DESCRIPTOR
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#define _UCSI_DVB_LOCAL_TIME_OFFSET_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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#include <libucsi/dvb/types.h>
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/**
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* dvb_local_time_offset_descriptor parameter.
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*/
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struct dvb_local_time_offset_descriptor {
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struct descriptor d;
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/* struct dvb_local_time_offset offsets[] */
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} __ucsi_packed;
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/**
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* Entry in the offsets field of dvb_local_time_offset_descriptor.
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*/
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struct dvb_local_time_offset {
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iso639country_t country_code;
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EBIT3(uint8_t country_region_id : 6; ,
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uint8_t reserved : 1; ,
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uint8_t local_time_offset_polarity : 1; );
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dvbhhmm_t local_time_offset;
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dvbdate_t time_of_change;
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dvbhhmm_t next_time_offset;
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} __ucsi_packed;
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/**
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* Process a dvb_local_time_offset_descriptor.
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*
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* @param d Generic descriptor pointer.
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* @return dvb_local_time_offset_descriptor pointer, or NULL on error.
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*/
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static inline struct dvb_local_time_offset_descriptor*
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dvb_local_time_offset_descriptor_codec(struct descriptor* d)
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{
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uint32_t len = d->len;
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uint32_t pos = 0;
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if (len % sizeof(struct dvb_local_time_offset))
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return NULL;
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while(pos < len) {
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pos += sizeof(struct dvb_local_time_offset);
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}
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return (struct dvb_local_time_offset_descriptor*) d;
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}
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/**
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* Iterator for the offsets field of a dvb_local_time_offset_descriptor.
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*
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* @param d dvb_local_time_offset_descriptor pointer.
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* @param pos Variable containing a pointer to the current dvb_local_time_offset.
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*/
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#define dvb_local_time_offset_descriptor_offsets_for_each(d, pos) \
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for ((pos) = dvb_local_time_offset_descriptor_offsets_first(d); \
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(pos); \
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(pos) = dvb_local_time_offset_descriptor_offsets_next(d, pos))
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/******************************** PRIVATE CODE ********************************/
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static inline struct dvb_local_time_offset*
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dvb_local_time_offset_descriptor_offsets_first(struct dvb_local_time_offset_descriptor *d)
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{
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if (d->d.len == 0)
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return NULL;
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return (struct dvb_local_time_offset *)
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((uint8_t*) d + sizeof(struct dvb_local_time_offset_descriptor));
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}
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static inline struct dvb_local_time_offset*
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dvb_local_time_offset_descriptor_offsets_next(struct dvb_local_time_offset_descriptor *d,
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struct dvb_local_time_offset *pos)
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{
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uint8_t *end = (uint8_t*) d + 2 + d->d.len;
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uint8_t *next = (uint8_t *) pos + sizeof(struct dvb_local_time_offset);
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if (next >= end)
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return NULL;
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return (struct dvb_local_time_offset *) 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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