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/*** tzraw.h -- reader for olson database zoneinfo files
*
* Copyright (C) 2009-2024 Sebastian Freundt
*
* Author: Sebastian Freundt <freundt@ga-group.nl>
*
* This file is part of uterus and dateutils.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the author nor the names of any contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
***/
#if !defined INCLUDED_tzraw_h_
#define INCLUDED_tzraw_h_
#include <stdint.h>
#include "leaps.h"
#if defined __cplusplus
extern "C" {
#endif /* __cplusplus */
/*
** Each file begins with. . .
*/
#define TZ_MAGIC "TZif"
#if 0
struct tzhead {
char tzh_magic[4]; /* TZ_MAGIC */
char tzh_version[1]; /* '\0' or '2' as of 2005 */
char tzh_reserved[15]; /* reserved--must be zero */
char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */
char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */
char tzh_leapcnt[4]; /* coded number of leap seconds */
char tzh_timecnt[4]; /* coded number of transition times */
char tzh_typecnt[4]; /* coded number of local time types */
char tzh_charcnt[4]; /* coded number of abbr. chars */
};
/*
** . . .followed by. . .
**
** tzh_timecnt (char [4])s coded transition times a la time(2)
** tzh_timecnt (unsigned char)s types of local time starting at above
** tzh_typecnt repetitions of
** one (char [4]) coded UTC offset in seconds
** one (unsigned char) used to set tm_isdst
** one (unsigned char) that's an abbreviation list index
** tzh_charcnt (char)s '\0'-terminated zone abbreviations
** tzh_leapcnt repetitions of
** one (char [4]) coded leap second transition times
** one (char [4]) total correction after above
** tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition
** time is standard time, if FALSE,
** transition time is wall clock time
** if absent, transition times are
** assumed to be wall clock time
** tzh_ttisgmtcnt (char)s indexed by type; if TRUE, transition
** time is UTC, if FALSE,
** transition time is local time
** if absent, transition times are
** assumed to be local time
*/
/*
** If tzh_version is '2' or greater, the above is followed by a second instance
** of tzhead and a second instance of the data in which each coded transition
** time uses 8 rather than 4 chars,
** then a POSIX-TZ-environment-variable-style string for use in handling
** instants after the last transition time stored in the file
** (with nothing between the newlines if there is no POSIX representation for
** such instants).
*/
#endif /* 0 */
/* now our view on things */
typedef struct zif_s *zif_t;
typedef int64_t stamp_t;
#define STAMP_MIN (-140737488355328LL)
#define STAMP_MAX (140737488355327LL)
typedef enum {
TZCZ_UNK,
TZCZ_UTC,
TZCZ_TAI,
TZCZ_GPS,
TZCZ_NZONE,
} coord_zone_t;
/* for the one tool that needs raw transitions */
struct zrng_s {
stamp_t prev, next;
signed int offs:24;
unsigned int trno:8;
} __attribute__((packed));
/**
* Open the zoneinfo file FILE.
* FILE can be absolute or relative to the configured TZDIR path.
* FILE can also name virtual zones such as GPS or TAI. */
extern zif_t zif_open(const char *file);
/**
* Close the zoneinfo file reader and free associated resources. */
extern void zif_close(zif_t);
/**
* Copy the zoneinfo structure. */
extern zif_t zif_copy(zif_t);
/**
* Find the most recent transition in Z before T. */
extern int zif_find_trans(zif_t z, stamp_t t);
/**
* Find a range of transitions in Z that T belongs to. */
extern struct zrng_s zif_find_zrng(zif_t z, stamp_t t);
/**
* Given T in local time specified by Z, return a T in UTC. */
extern stamp_t zif_utc_time(zif_t z, stamp_t t);
/**
* Given T in UTC, return a T in local time specified by Z. */
extern stamp_t zif_local_time(zif_t z, stamp_t t);
/* exposure for specific zif-inspecting tools (dzone(1) for one) */
/**
* Return the gmt offset (in seconds) after the N-th transition in Z. */
extern int zif_troffs(zif_t z, int n);
/**
* Return the number of transitions in Z. */
extern size_t zif_ntrans(zif_t z);
#if defined __cplusplus
}
#endif /* __cplusplus */
#endif /* INCLUDED_tzraw_h_ */
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