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

   1 #ifndef _WIMLIB_TIMESTAMP_H
   2 #define _WIMLIB_TIMESTAMP_H
   3
   4 #include "wimlib/types.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
  22 unix_timestamp_to_wim(time_t t)
  23 {
  24         return (u64)intervals_1601_to_1970 + t * intervals_per_second;
  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
  30 wim_timestamp_to_unix(u64 timestamp)
  31 {
  32         return (timestamp - intervals_1601_to_1970) / intervals_per_second;
  33 }
  34
  35 static inline u64
  36 timeval_to_wim_timestamp(const struct timeval tv)
  37 {
  38         return intervals_1601_to_1970
  39                + (u64)tv.tv_sec * intervals_per_second
  40                + (u64)tv.tv_usec * intervals_per_microsecond;
  41 }
  42
  43 static inline struct timeval
  44 wim_timestamp_to_timeval(u64 timestamp)
  45 {
  46         struct timeval tv;
  47         tv.tv_sec = (timestamp - intervals_1601_to_1970) / intervals_per_second;
  48         tv.tv_usec = ((timestamp - intervals_1601_to_1970) /
  49                         intervals_per_microsecond) % 1000000;
  50         return tv;
  51 }
  52
  53 static inline u64
  54 timespec_to_wim_timestamp(const struct timespec ts)
  55 {
  56         return intervals_1601_to_1970
  57                + (u64)ts.tv_sec * intervals_per_second
  58                + (u64)ts.tv_nsec / nanoseconds_per_interval;
  59 }
  60
  61 static inline struct timespec
  62 wim_timestamp_to_timespec(u64 timestamp)
  63 {
  64         struct timespec ts;
  65         ts.tv_sec = (timestamp - intervals_1601_to_1970) / intervals_per_second;
  66         ts.tv_nsec = ((timestamp - intervals_1601_to_1970) % intervals_per_second) *
  67                         nanoseconds_per_interval;
  68         return ts;
  69 }
  70
  71 extern u64
  72 get_wim_timestamp(void);
  73
  74 extern void
  75 wim_timestamp_to_str(u64 timestamp, tchar *buf, size_t len);
  76
  77 #endif