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// SPDX-FileCopyrightText: 2026 Shun Sakai
//
// SPDX-License-Identifier: Apache-2.0 OR MIT
//! Implementations of conversions between [`FileTime`] and [`Duration`].
use core::time::Duration;
use super::FileTime;
use crate::error::{FileTimeRangeError, FileTimeRangeErrorKind};
impl FileTime {
/// Returns this `FileTime` as a [`Duration`] since
/// [`FileTime::NT_TIME_EPOCH`].
///
/// # Examples
///
/// ```
/// # use core::time::Duration;
/// #
/// # use nt_time::FileTime;
/// #
/// assert_eq!(FileTime::NT_TIME_EPOCH.to_duration(), Duration::ZERO);
/// assert_eq!(
/// FileTime::UNIX_EPOCH.to_duration(),
/// Duration::from_hours(3_234_576)
/// );
/// assert_eq!(
/// FileTime::SIGNED_MAX.to_duration(),
/// Duration::new(922_337_203_685, 477_580_700)
/// );
/// assert_eq!(
/// FileTime::MAX.to_duration(),
/// Duration::new(1_844_674_407_370, 955_161_500)
/// );
/// ```
#[must_use]
pub fn to_duration(self) -> Duration {
Duration::from_nanos_u128(u128::from(self.to_raw()) * 100)
}
/// Creates a `FileTime` from a [`Duration`] since
/// [`FileTime::NT_TIME_EPOCH`].
///
/// # Errors
///
/// Returns [`Err`] if `duration` is greater than [`FileTime::MAX`].
///
/// # Examples
///
/// ```
/// # use core::time::Duration;
/// #
/// # use nt_time::FileTime;
/// #
/// assert_eq!(
/// FileTime::from_duration(Duration::ZERO),
/// Ok(FileTime::NT_TIME_EPOCH)
/// );
/// assert_eq!(
/// FileTime::from_duration(Duration::from_hours(3_234_576)),
/// Ok(FileTime::UNIX_EPOCH)
/// );
/// assert_eq!(
/// FileTime::from_duration(Duration::new(922_337_203_685, 477_580_700)),
/// Ok(FileTime::SIGNED_MAX)
/// );
/// assert_eq!(
/// FileTime::from_duration(Duration::new(1_844_674_407_370, 955_161_500)),
/// Ok(FileTime::MAX)
/// );
///
/// // After `+60056-05-28 05:36:10.955161500 UTC`.
/// assert!(FileTime::from_duration(Duration::new(1_844_674_407_370, 955_161_600)).is_err());
/// ```
pub fn from_duration(duration: Duration) -> Result<Self, FileTimeRangeError> {
let ft = u64::try_from(duration.as_nanos() / 100)
.map_err(|_| FileTimeRangeErrorKind::Overflow)?;
Ok(Self::new(ft))
}
}
#[cfg(test)]
mod tests {
use super::{super::FILE_TIMES_PER_SEC, *};
#[test]
fn to_duration() {
assert_eq!(FileTime::NT_TIME_EPOCH.to_duration(), Duration::ZERO);
assert_eq!(FileTime::new(1).to_duration(), Duration::from_nanos(100));
assert_eq!(
FileTime::new(FILE_TIMES_PER_SEC - 1).to_duration(),
Duration::from_nanos(999_999_900)
);
assert_eq!(
FileTime::new(FILE_TIMES_PER_SEC).to_duration(),
Duration::from_secs(1)
);
assert_eq!(
(FileTime::UNIX_EPOCH - Duration::from_nanos(100)).to_duration(),
Duration::new(11_644_473_599, 999_999_900)
);
assert_eq!(
FileTime::UNIX_EPOCH.to_duration(),
Duration::from_hours(3_234_576)
);
assert_eq!(
(FileTime::UNIX_EPOCH + Duration::from_nanos(100)).to_duration(),
Duration::new(11_644_473_600, 100)
);
assert_eq!(
FileTime::SIGNED_MAX.to_duration(),
Duration::new(922_337_203_685, 477_580_700)
);
assert_eq!(
(FileTime::MAX - Duration::from_nanos(100)).to_duration(),
Duration::new(1_844_674_407_370, 955_161_400)
);
assert_eq!(
FileTime::MAX.to_duration(),
Duration::new(1_844_674_407_370, 955_161_500)
);
}
#[test]
fn from_duration() {
assert_eq!(
FileTime::from_duration(Duration::ZERO).unwrap(),
FileTime::NT_TIME_EPOCH
);
assert_eq!(
FileTime::from_duration(Duration::from_nanos(1)).unwrap(),
FileTime::NT_TIME_EPOCH
);
assert_eq!(
FileTime::from_duration(Duration::from_nanos(99)).unwrap(),
FileTime::NT_TIME_EPOCH
);
assert_eq!(
FileTime::from_duration(Duration::from_nanos(100)).unwrap(),
FileTime::new(1)
);
assert_eq!(
FileTime::from_duration(Duration::from_nanos(999_999_900)).unwrap(),
FileTime::new(FILE_TIMES_PER_SEC - 1)
);
assert_eq!(
FileTime::from_duration(Duration::from_nanos(999_999_901)).unwrap(),
FileTime::new(FILE_TIMES_PER_SEC - 1)
);
assert_eq!(
FileTime::from_duration(Duration::from_nanos(999_999_999)).unwrap(),
FileTime::new(FILE_TIMES_PER_SEC - 1)
);
assert_eq!(
FileTime::from_duration(Duration::from_secs(1)).unwrap(),
FileTime::new(FILE_TIMES_PER_SEC)
);
assert_eq!(
FileTime::from_duration(Duration::new(11_644_473_599, 999_999_900)).unwrap(),
FileTime::UNIX_EPOCH - Duration::from_nanos(100)
);
assert_eq!(
FileTime::from_duration(Duration::new(11_644_473_599, 999_999_901)).unwrap(),
FileTime::UNIX_EPOCH - Duration::from_nanos(100)
);
assert_eq!(
FileTime::from_duration(Duration::new(11_644_473_599, 999_999_999)).unwrap(),
FileTime::UNIX_EPOCH - Duration::from_nanos(100)
);
assert_eq!(
FileTime::from_duration(Duration::from_hours(3_234_576)).unwrap(),
FileTime::UNIX_EPOCH
);
assert_eq!(
FileTime::from_duration(Duration::new(11_644_473_600, 1)).unwrap(),
FileTime::UNIX_EPOCH
);
assert_eq!(
FileTime::from_duration(Duration::new(11_644_473_600, 99)).unwrap(),
FileTime::UNIX_EPOCH
);
assert_eq!(
FileTime::from_duration(Duration::new(11_644_473_600, 100)).unwrap(),
FileTime::UNIX_EPOCH + Duration::from_nanos(100)
);
assert_eq!(
FileTime::from_duration(Duration::new(922_337_203_685, 477_580_700)).unwrap(),
FileTime::SIGNED_MAX
);
assert_eq!(
FileTime::from_duration(Duration::new(1_844_674_407_370, 955_161_500)).unwrap(),
FileTime::MAX
);
}
#[test]
fn from_duration_with_too_big_date_time() {
assert_eq!(
FileTime::from_duration(Duration::new(1_844_674_407_370, 955_161_600)).unwrap_err(),
FileTimeRangeErrorKind::Overflow.into()
);
assert_eq!(
FileTime::from_duration(Duration::MAX).unwrap_err(),
FileTimeRangeErrorKind::Overflow.into()
);
}
}