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