wimlib.net Git - wimlib/blob - src/timestamp.h

   1 #ifndef _WIMLIB_TIMESTAMP_H
   2 #define _WIMLIB_TIMESTAMP_H
   3
   4 #include "util.h"
   5 #include <sys/types.h>
   6 #include <sys/time.h>
   7
   8 #define intervals_per_second (1000000000ULL / 100ULL)
   9 #define intervals_per_microsecond (10)
  10 #define nanoseconds_per_interval (100)
  11 #define days_per_year (365ULL)
  12 #define seconds_per_day (3600ULL * 24ULL)
  13 #define intervals_per_day (seconds_per_day * intervals_per_second)
  14 #define intervals_per_year (intervals_per_day * days_per_year)
  15 #define years_1601_to_1970 (1970ULL - 1601ULL)
  16 #define leap_years_1601_to_1970 (years_1601_to_1970 / 4ULL - 3ULL)
  17 #define intervals_1601_to_1970 (years_1601_to_1970 * intervals_per_year \
  18                                 + leap_years_1601_to_1970 * intervals_per_day)
  19
  20 static inline u64 unix_timestamp_to_wim(time_t t)
  21 {
  22         return (u64)intervals_1601_to_1970 + t * intervals_per_second;
  23 }
  24
  25
  26 /* Converts a timestamp as used in the WIM file to a UNIX timestamp as used in
  27  * the time() function. */
  28 static inline time_t wim_timestamp_to_unix(u64 timestamp)
  29 {
  30         return (timestamp - intervals_1601_to_1970) / intervals_per_second;
  31 }
  32
  33 static inline u64 timeval_to_wim_timestamp(const struct timeval *tv)
  34 {
  35         return intervals_1601_to_1970
  36                + (u64)tv->tv_sec * intervals_per_second
  37                + (u64)tv->tv_usec * intervals_per_microsecond;
  38 }
  39
  40 static inline void wim_timestamp_to_timeval(u64 timestamp, struct timeval *tv)
  41 {
  42         tv->tv_sec = (timestamp - intervals_1601_to_1970) / intervals_per_second;
  43         tv->tv_usec = ((timestamp - intervals_1601_to_1970) /
  44                         intervals_per_microsecond) % 1000000;
  45 }
  46
  47 static inline u64 timespec_to_wim_timestamp(const struct timespec *ts)
  48 {
  49         return intervals_1601_to_1970
  50                + (u64)ts->tv_sec * intervals_per_second
  51                + (u64)ts->tv_nsec / nanoseconds_per_interval;
  52 }
  53
  54
  55 extern u64 get_wim_timestamp();
  56
  57 #endif