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Update ntp-4.2.8p13 --> 4.2.8p14. The advisory can be found at: http://support.ntp.org/bin/view/Main/SecurityNotice#\ March_2020_ntp_4_2_8p14_NTP_Rele No CVEs have been documented yet. MFC after: now Security: http://support.ntp.org/bin/view/Main/NtpBug3610 http://support.ntp.org/bin/view/Main/NtpBug3596 http://support.ntp.org/bin/view/Main/NtpBug3592
152 lines
4 KiB
C
152 lines
4 KiB
C
/*
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* ntp_calgps.h - calendar for GPS/GNSS based clocks
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*
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* Written by Juergen Perlinger (perlinger@ntp.org) for the NTP project.
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* The contents of 'html/copyright.html' apply.
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*
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* --------------------------------------------------------------------
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*
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* This module implements stuff often used with GPS/GNSS receivers
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*/
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#ifndef NTP_CALGPS_H
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#define NTP_CALGPS_H
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#include <time.h>
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#include "ntp_types.h"
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#include "ntp_fp.h"
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#include "ntp_calendar.h"
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/* GPS week calendar (extended weeks)
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* We use weeks based on 1899-31-12, which was the last Sunday before
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* the begin of the NTP epoch. (Which is equivalent to saying 1900-01-01
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* was a Monday...)
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*
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* We simply pre-calculate the offsets and cycle shifts for the real GPS
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* calendar, which starts at 1980-01-06, to simplyfy some expressions.
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*
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* This has a fringe benefit that should not be overlooked: Since week zero
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* is around 1900, and we should never have to deal with dates before
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* 1970 or 1980, a week number of zero can be easily used to indicate
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* an invalid week time stamp.
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*/
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#define GPSNTP_WSHIFT 4175 /* weeks 1899-31-12 --> 1980-01-06 */
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#define GPSNTP_WCYCLE 79 /* above, modulo 1024 */
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#define GPSNTP_DSHIFT 1 /* day number of 1900-01-01 in week */
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struct gpsdatum {
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uint32_t weeks; /* weeks since GPS epoch */
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int32_t wsecs; /* seconds since week start */
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uint32_t frac; /* fractional seconds */
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};
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typedef struct gpsdatum TGpsDatum;
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typedef struct gpsdatum const TcGpsDatum;
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/* NTP date/time in split representation */
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struct ntpdatum {
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uint32_t days; /* since NTP epoch */
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int32_t secs; /* since midnight, denorm is ok */
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uint32_t frac; /* fractional seconds */
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};
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typedef struct ntpdatum TNtpDatum;
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typedef struct ntpdatum const TcNtpDatum;
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/*
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* GPS week/sec calendar functions
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*
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* see the implementation for details, especially the
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* 'gpscal_from_weektime{1,2}()'
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*/
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extern TGpsDatum
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gpscal_fix_gps_era(TcGpsDatum *);
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extern void
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gpscal_add_offset(TGpsDatum *datum, l_fp offset);
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extern TGpsDatum
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gpscal_from_calendar_ex(TcCivilDate*, l_fp fofs, int/*BOOL*/ warp);
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static inline TGpsDatum
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gpscal_from_calendar(TcCivilDate *pCiv, l_fp fofs) {
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return gpscal_from_calendar_ex(pCiv, fofs, TRUE);
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}
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extern TGpsDatum /* see source for semantic of the 'fofs' value! */
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gpscal_from_gpsweek(uint16_t w, int32_t s, l_fp fofs);
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extern TGpsDatum
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gpscal_from_weektime1(int32_t wsecs, l_fp fofs, l_fp pivot);
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extern TGpsDatum
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gpscal_from_weektime2(int32_t wsecs, l_fp fofs, TcGpsDatum *pivot);
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extern void
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gpscal_to_calendar(TCivilDate*, TcGpsDatum*);
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extern TGpsDatum
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gpscal_from_gpsntp(TcNtpDatum*);
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extern l_fp
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ntpfp_from_gpsdatum(TcGpsDatum *);
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/*
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* NTP day/sec calendar functions
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*
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* see the implementation for details, especially the
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* 'gpscal_from_daytime{1,2}()'
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*/
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extern TNtpDatum
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gpsntp_fix_gps_era(TcNtpDatum *);
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extern void
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gpsntp_add_offset(TNtpDatum *datum, l_fp offset);
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extern TNtpDatum
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gpsntp_from_calendar_ex(TcCivilDate*, l_fp fofs, int/*BOOL*/ warp);
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static inline TNtpDatum
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gpsntp_from_calendar(TcCivilDate * pCiv, l_fp fofs) {
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return gpsntp_from_calendar_ex(pCiv, fofs, TRUE);
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}
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extern TNtpDatum
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gpsntp_from_daytime1_ex(TcCivilDate *dt, l_fp fofs, l_fp pivot, int/*BOOL*/ warp);
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static inline TNtpDatum
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gpsntp_from_daytime1(TcCivilDate *dt, l_fp fofs, l_fp pivot) {
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return gpsntp_from_daytime1_ex(dt, fofs, pivot, TRUE);
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}
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extern TNtpDatum
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gpsntp_from_daytime2_ex(TcCivilDate *dt, l_fp fofs, TcNtpDatum *pivot, int/*BOOL*/ warp);
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static inline TNtpDatum
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gpsntp_from_daytime2(TcCivilDate *dt, l_fp fofs, TcNtpDatum *pivot) {
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return gpsntp_from_daytime2_ex(dt, fofs, pivot, TRUE);
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}
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extern TNtpDatum
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gpsntp_from_gpscal_ex(TcGpsDatum*, int/*BOOL*/ warp);
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static inline TNtpDatum
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gpsntp_from_gpscal(TcGpsDatum *wd) {
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return gpsntp_from_gpscal_ex(wd, FALSE);
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}
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extern void
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gpsntp_to_calendar(TCivilDate*, TcNtpDatum*);
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extern l_fp
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ntpfp_from_ntpdatum(TcNtpDatum*);
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/*
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* Some helpers
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*/
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/* apply fudge to time stamp: *SUBTRACT* the given offset from an l_fp*/
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extern l_fp
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ntpfp_with_fudge(l_fp lfp, double ofs);
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#endif /*!defined(NTP_CALGPS_H)*/
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