pk2/
filetime.rs

1use std::time::{Duration, SystemTime};
2
3#[allow(non_snake_case)]
4#[derive(Clone, Copy, Debug, Default, Eq, PartialEq)]
5pub struct FILETIME {
6    pub dwLowDateTime: u32,
7    pub dwHighDateTime: u32,
8}
9
10impl FILETIME {
11    const MS_EPOCH: u64 = 11_6444_7360_0000_0000;
12
13    #[inline]
14    pub fn now() -> Self {
15        SystemTime::now().into()
16    }
17
18    pub fn into_systime(self) -> Option<SystemTime> {
19        let FILETIME { dwLowDateTime: low, dwHighDateTime: high } = self;
20        let ftime = ((high as u64) << 32) | low as u64;
21        let nanos = (ftime.checked_sub(Self::MS_EPOCH)?) * 100;
22        Some(SystemTime::UNIX_EPOCH + Duration::from_nanos(nanos))
23    }
24}
25
26impl From<SystemTime> for FILETIME {
27    fn from(time: SystemTime) -> Self {
28        let duration = time.duration_since(SystemTime::UNIX_EPOCH).unwrap();
29        let ftime = (duration.as_nanos() / 100) as u64 + Self::MS_EPOCH;
30        FILETIME { dwLowDateTime: ftime as u32, dwHighDateTime: (ftime >> 32) as u32 }
31    }
32}
33
34#[test]
35fn test_convert_roundtrip() {
36    let now = SystemTime::now();
37    let ftime = FILETIME::from(now);
38    let round_trip = ftime.into_systime().unwrap();
39    // we compare it this way because the conversion loses precision due to the
40    // division by 100. So comparing it by dividing the nanoseconds we will get a
41    // lossless comparison for systems that have a higher timer resolution.
42    assert_eq!(
43        now.duration_since(SystemTime::UNIX_EPOCH)
44            .as_ref()
45            .map(Duration::as_nanos)
46            .map(|nanos| nanos / 100)
47            .unwrap(),
48        round_trip
49            .duration_since(SystemTime::UNIX_EPOCH)
50            .as_ref()
51            .map(Duration::as_nanos)
52            .map(|nanos| nanos / 100)
53            .unwrap()
54    );
55}
pk2/filetime.rs

pk2/
filetime.rs
