1 #ifndef _WIMLIB_TIMESTAMP_H
2 #define _WIMLIB_TIMESTAMP_H
7 #define intervals_per_second (1000000000ULL / 100ULL)
8 #define intervals_per_microsecond (10)
9 #define nanoseconds_per_interval (100)
10 #define days_per_year (365ULL)
11 #define seconds_per_day (3600ULL * 24ULL)
12 #define intervals_per_day (seconds_per_day * intervals_per_second)
13 #define intervals_per_year (intervals_per_day * days_per_year)
14 #define years_1601_to_1970 (1970ULL - 1601ULL)
15 #define leap_years_1601_to_1970 (years_1601_to_1970 / 4ULL - 3ULL)
16 #define intervals_1601_to_1970 (years_1601_to_1970 * intervals_per_year \
17 + leap_years_1601_to_1970 * intervals_per_day)
19 static inline u64 unix_timestamp_to_wim(time_t t)
21 return (u64)intervals_1601_to_1970 + t * intervals_per_second;
25 /* Converts a timestamp as used in the WIM file to a UNIX timestamp as used in
26 * the time() function. */
27 static inline time_t wim_timestamp_to_unix(u64 timestamp)
29 return (timestamp - intervals_1601_to_1970) / intervals_per_second;
32 static inline u64 timeval_to_wim_timestamp(const struct timeval *tv)
34 return intervals_1601_to_1970
35 + (u64)tv->tv_sec * intervals_per_second
36 + (u64)tv->tv_usec * intervals_per_microsecond;
39 static inline void wim_timestamp_to_timeval(u64 timestamp, struct timeval *tv)
41 tv->tv_sec = (timestamp - intervals_1601_to_1970) / intervals_per_second;
42 tv->tv_usec = ((timestamp - intervals_1601_to_1970) /
43 intervals_per_microsecond) % 1000000;
46 static inline u64 timespec_to_wim_timestamp(const struct timespec *ts)
48 return intervals_1601_to_1970
49 + (u64)ts->tv_sec * intervals_per_second
50 + (u64)ts->tv_nsec / nanoseconds_per_interval;
54 extern u64 get_wim_timestamp();