nt_time/file_time/dos_date_time.rs
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// SPDX-FileCopyrightText: 2023 Shun Sakai
//
// SPDX-License-Identifier: Apache-2.0 OR MIT
//! Implementations of conversions between [`FileTime`] and [MS-DOS date and
//! time].
//!
//! [MS-DOS date and time]: https://learn.microsoft.com/en-us/windows/win32/sysinfo/ms-dos-date-and-time
use time::{error::ComponentRange, macros::offset, Date, OffsetDateTime, Time, UtcOffset};
use super::FileTime;
use crate::error::{DosDateTimeRangeError, DosDateTimeRangeErrorKind};
impl FileTime {
/// Returns [MS-DOS date and time] which represents the same date and time
/// as this `FileTime`. This date and time is used as the timestamp such as
/// [FAT], [exFAT] or [ZIP] file format.
///
/// This method returns a `(date, time, resolution, offset)` tuple if the
/// result is [`Ok`].
///
/// `date` and `time` represents the local date and time. This date and time
/// has no notion of time zone. The resolution of MS-DOS date and time is 2
/// seconds, but additional [finer resolution] (10 ms units) can be
/// provided. `resolution` represents this additional finer resolution.
///
/// When the `offset` parameter is [`Some`], converts `date` and `time` from
/// UTC to the local date and time in the provided time zone and returns it
/// with the [UTC offset]. When the `offset` parameter is [`None`] or is not
/// a multiple of 15 minute intervals, returns the UTC date and time as a
/// date and time and [`None`] as the UTC offset.
///
/// # Errors
///
/// Returns [`Err`] if the resulting date and time is out of range for
/// MS-DOS date and time.
///
/// # Panics
///
/// Panics if `offset` is out of range for the [OffsetFromUtc field].
///
/// # Examples
///
/// ```
/// # use nt_time::{time::macros::offset, FileTime};
/// #
/// // `1980-01-01 00:00:00 UTC`.
/// assert_eq!(
/// FileTime::new(119_600_064_000_000_000)
/// .to_dos_date_time(None)
/// .unwrap(),
/// (0x0021, u16::MIN, u8::MIN, None)
/// );
/// // `2107-12-31 23:59:59 UTC`.
/// assert_eq!(
/// FileTime::new(159_992_927_990_000_000)
/// .to_dos_date_time(None)
/// .unwrap(),
/// (0xff9f, 0xbf7d, 100, None)
/// );
///
/// // Before `1980-01-01 00:00:00 UTC`.
/// assert!(FileTime::new(119_600_063_990_000_000)
/// .to_dos_date_time(None)
/// .is_err());
/// // After `2107-12-31 23:59:59.990000000 UTC`.
/// assert!(FileTime::new(159_992_928_000_000_000)
/// .to_dos_date_time(None)
/// .is_err());
///
/// // From `2002-11-27 03:25:00 UTC` to `2002-11-26 19:25:00 -08:00`.
/// assert_eq!(
/// FileTime::new(126_828_411_000_000_000)
/// .to_dos_date_time(Some(offset!(-08:00)))
/// .unwrap(),
/// (0x2d7a, 0x9b20, u8::MIN, Some(offset!(-08:00)))
/// );
/// ```
///
/// When the UTC offset is not a multiple of 15 minute intervals, returns
/// the UTC date and time:
///
/// ```
/// # use nt_time::{time::macros::offset, FileTime};
/// #
/// // `2002-11-27 03:25:00 UTC`.
/// assert_eq!(
/// FileTime::new(126_828_411_000_000_000)
/// .to_dos_date_time(Some(offset!(-08:01)))
/// .unwrap(),
/// (0x2d7b, 0x1b20, u8::MIN, None)
/// );
/// // `2002-11-27 03:25:00 UTC`.
/// assert_eq!(
/// FileTime::new(126_828_411_000_000_000)
/// .to_dos_date_time(Some(offset!(-08:14)))
/// .unwrap(),
/// (0x2d7b, 0x1b20, u8::MIN, None)
/// );
///
/// // From `2002-11-27 03:25:00 UTC` to `2002-11-26 19:10:00 -08:15`.
/// assert_eq!(
/// FileTime::new(126_828_411_000_000_000)
/// .to_dos_date_time(Some(offset!(-08:15)))
/// .unwrap(),
/// (0x2d7a, 0x9940, u8::MIN, Some(offset!(-08:15)))
/// );
/// ```
///
/// [MS-DOS date and time]: https://learn.microsoft.com/en-us/windows/win32/sysinfo/ms-dos-date-and-time
/// [FAT]: https://en.wikipedia.org/wiki/File_Allocation_Table
/// [exFAT]: https://en.wikipedia.org/wiki/ExFAT
/// [ZIP]: https://en.wikipedia.org/wiki/ZIP_(file_format)
/// [finer resolution]: https://learn.microsoft.com/en-us/windows/win32/fileio/exfat-specification#749-10msincrement-fields
/// [UTC offset]: https://learn.microsoft.com/en-us/windows/win32/fileio/exfat-specification#7410-utcoffset-fields
/// [OffsetFromUtc field]: https://learn.microsoft.com/en-us/windows/win32/fileio/exfat-specification#74101-offsetfromutc-field
pub fn to_dos_date_time(
self,
offset: Option<UtcOffset>,
) -> Result<(u16, u16, u8, Option<UtcOffset>), DosDateTimeRangeError> {
let offset = offset.filter(|o| o.whole_seconds() % 900 == 0);
if let Some(o) = offset {
// The UTC offset must be in the range of a 7-bit signed integer.
assert!((offset!(-16:00)..=offset!(+15:45)).contains(&o));
}
let dt = OffsetDateTime::try_from(self)
.ok()
.and_then(|dt| dt.checked_to_offset(offset.unwrap_or(UtcOffset::UTC)))
.ok_or(DosDateTimeRangeErrorKind::Overflow)?;
match dt.year() {
..=1979 => Err(DosDateTimeRangeErrorKind::Negative.into()),
2108.. => Err(DosDateTimeRangeErrorKind::Overflow.into()),
_ => {
let (date, time) = (dt.date(), dt.time());
let (second, minute, hour) = (time.second() / 2, time.minute(), time.hour());
let resolution = ((time
- Time::from_hms(hour, minute, second * 2)
.expect("the MS-DOS time should be in the range of `Time`"))
.whole_milliseconds()
/ 10)
.try_into()
.expect("resolution should be in the range of `u8`");
debug_assert!(resolution <= 199);
let (second, minute, hour) =
(u16::from(second), u16::from(minute), u16::from(hour));
let dos_time = second + (minute << 5) + (hour << 11);
let (day, month, year) = (
i32::from(date.day()),
i32::from(u8::from(date.month())),
date.year() - 1980,
);
let dos_date = (day + (month << 5) + (year << 9))
.try_into()
.expect("the MS-DOS date should be in the range of `u16`");
Ok((dos_date, dos_time, resolution, offset))
}
}
}
/// Creates a `FileTime` with the given [MS-DOS date and time]. This date
/// and time is used as the timestamp such as [FAT], [exFAT] or [ZIP] file
/// format.
///
/// When `resolution` is [`Some`], additional [finer resolution] (10 ms
/// units) is added to `time`.
///
/// When `offset` is [`Some`], converts `date` and `time` from the local
/// date and time in the provided time zone to UTC. When `offset` is
/// [`None`] or is not a multiple of 15 minute intervals, assumes the
/// provided date and time is in UTC.
///
/// # Errors
///
/// Returns [`Err`] if `date` or `time` is an invalid date and time.
///
/// # Panics
///
/// Panics if any of the following are true:
///
/// - `resolution` is greater than 199.
/// - `offset` is out of range for the [OffsetFromUtc field].
///
/// # Examples
///
/// ```
/// # use nt_time::{time::macros::offset, FileTime};
/// #
/// // `1980-01-01 00:00:00 UTC`.
/// assert_eq!(
/// FileTime::from_dos_date_time(0x0021, u16::MIN, None, None).unwrap(),
/// FileTime::new(119_600_064_000_000_000)
/// );
/// // `2107-12-31 23:59:59 UTC`.
/// assert_eq!(
/// FileTime::from_dos_date_time(0xff9f, 0xbf7d, Some(100), None).unwrap(),
/// FileTime::new(159_992_927_990_000_000)
/// );
///
/// // From `2002-11-26 19:25:00 -08:00` to `2002-11-27 03:25:00 UTC`.
/// assert_eq!(
/// FileTime::from_dos_date_time(0x2d7a, 0x9b20, None, Some(offset!(-08:00))).unwrap(),
/// FileTime::new(126_828_411_000_000_000)
/// );
///
/// // The Day field is 0.
/// assert!(FileTime::from_dos_date_time(0x0020, u16::MIN, None, None).is_err());
/// // The DoubleSeconds field is 30.
/// assert!(FileTime::from_dos_date_time(0x0021, 0x001e, None, None).is_err());
/// ```
///
/// When the [UTC offset] is not a multiple of 15 minute intervals, assumes
/// the provided date and time is in UTC:
///
/// ```
/// # use nt_time::{time::macros::offset, FileTime};
/// #
/// // From `2002-11-26 19:25:00 -08:01` to `2002-11-26 19:25:00 UTC`.
/// assert_eq!(
/// FileTime::from_dos_date_time(0x2d7a, 0x9b20, None, Some(offset!(-08:01))).unwrap(),
/// FileTime::new(126_828_123_000_000_000)
/// );
/// // From `2002-11-26 19:25:00 -08:14` to `2002-11-26 19:25:00 UTC`.
/// assert_eq!(
/// FileTime::from_dos_date_time(0x2d7a, 0x9b20, None, Some(offset!(-08:14))).unwrap(),
/// FileTime::new(126_828_123_000_000_000)
/// );
///
/// // From `2002-11-26 19:25:00 -08:15` to `2002-11-27 03:40:00 UTC`.
/// assert_eq!(
/// FileTime::from_dos_date_time(0x2d7a, 0x9b20, None, Some(offset!(-08:15))).unwrap(),
/// FileTime::new(126_828_420_000_000_000)
/// );
/// ```
///
/// Additional finer resolution must be in the range 0 to 199:
///
/// ```should_panic
/// # use nt_time::FileTime;
/// #
/// let _: FileTime = FileTime::from_dos_date_time(0x0021, u16::MIN, Some(200), None).unwrap();
/// ```
///
/// [MS-DOS date and time]: https://learn.microsoft.com/en-us/windows/win32/sysinfo/ms-dos-date-and-time
/// [FAT]: https://en.wikipedia.org/wiki/File_Allocation_Table
/// [exFAT]: https://en.wikipedia.org/wiki/ExFAT
/// [ZIP]: https://en.wikipedia.org/wiki/ZIP_(file_format)
/// [finer resolution]: https://learn.microsoft.com/en-us/windows/win32/fileio/exfat-specification#749-10msincrement-fields
/// [OffsetFromUtc field]: https://learn.microsoft.com/en-us/windows/win32/fileio/exfat-specification#74101-offsetfromutc-field
/// [UTC offset]: https://learn.microsoft.com/en-us/windows/win32/fileio/exfat-specification#7410-utcoffset-fields
pub fn from_dos_date_time(
date: u16,
time: u16,
resolution: Option<u8>,
offset: Option<UtcOffset>,
) -> Result<Self, ComponentRange> {
use core::time::Duration;
let (second, minute, hour) = (
((time & 0x1f) * 2)
.try_into()
.expect("second should be in the range of `u8`"),
((time >> 5) & 0x3f)
.try_into()
.expect("minute should be in the range of `u8`"),
(time >> 11)
.try_into()
.expect("hour should be in the range of `u8`"),
);
let mut time = Time::from_hms(hour, minute, second)?;
if let Some(res) = resolution {
assert!(res <= 199);
time += Duration::from_millis(u64::from(res) * 10);
}
let (day, month, year) = (
(date & 0x1f)
.try_into()
.expect("day should be in the range of `u8`"),
u8::try_from((date >> 5) & 0x0f)
.expect("month should be in the range of `u8`")
.try_into()?,
((date >> 9) + 1980).into(),
);
let date = Date::from_calendar_date(year, month, day)?;
let offset = offset.filter(|o| o.whole_seconds() % 900 == 0);
if let Some(o) = offset {
// The UTC offset must be in the range of a 7-bit signed integer.
assert!((offset!(-16:00)..=offset!(+15:45)).contains(&o));
}
let ft = OffsetDateTime::new_in_offset(date, time, offset.unwrap_or(UtcOffset::UTC))
.try_into()
.expect("MS-DOS date and time should be in the range of `FileTime`");
Ok(ft)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn to_dos_date_time_before_dos_date_time_epoch() {
// `1979-12-31 23:59:58 UTC`.
assert_eq!(
FileTime::new(119_600_063_980_000_000)
.to_dos_date_time(None)
.unwrap_err(),
DosDateTimeRangeErrorKind::Negative.into()
);
// `1979-12-31 23:59:59 UTC`.
assert_eq!(
FileTime::new(119_600_063_990_000_000)
.to_dos_date_time(None)
.unwrap_err(),
DosDateTimeRangeErrorKind::Negative.into()
);
// `1980-01-01 00:59:58 UTC`.
assert_eq!(
FileTime::new(119_600_099_980_000_000)
.to_dos_date_time(Some(offset!(-01:00)))
.unwrap_err(),
DosDateTimeRangeErrorKind::Negative.into()
);
// `1980-01-01 00:59:59 UTC`.
assert_eq!(
FileTime::new(119_600_099_990_000_000)
.to_dos_date_time(Some(offset!(-01:00)))
.unwrap_err(),
DosDateTimeRangeErrorKind::Negative.into()
);
}
#[cfg(feature = "std")]
#[test_strategy::proptest]
fn to_dos_date_time_before_dos_date_time_epoch_roundtrip(
#[strategy(..=119_600_063_980_000_000_u64)] ft: u64,
) {
use proptest::prop_assert_eq;
prop_assert_eq!(
FileTime::new(ft).to_dos_date_time(None).unwrap_err(),
DosDateTimeRangeErrorKind::Negative.into()
);
}
#[test]
#[allow(clippy::too_many_lines)]
fn to_dos_date_time() {
// `1980-01-01 00:00:00 UTC`.
assert_eq!(
FileTime::new(119_600_064_000_000_000)
.to_dos_date_time(None)
.unwrap(),
(0x0021, u16::MIN, u8::MIN, None)
);
// `1980-01-01 00:00:01 UTC`.
assert_eq!(
FileTime::new(119_600_064_010_000_000)
.to_dos_date_time(None)
.unwrap(),
(0x0021, u16::MIN, 100, None)
);
// <https://github.com/zip-rs/zip/blob/v0.6.4/src/types.rs#L553-L569>.
//
// `2018-11-17 10:38:30 UTC`.
assert_eq!(
FileTime::new(131_869_247_100_000_000)
.to_dos_date_time(None)
.unwrap(),
(0x4d71, 0x54cf, u8::MIN, None)
);
// `2107-12-31 23:59:58 UTC`.
assert_eq!(
FileTime::new(159_992_927_980_000_000)
.to_dos_date_time(None)
.unwrap(),
(0xff9f, 0xbf7d, u8::MIN, None)
);
// `2107-12-31 23:59:59 UTC`.
assert_eq!(
FileTime::new(159_992_927_990_000_000)
.to_dos_date_time(None)
.unwrap(),
(0xff9f, 0xbf7d, 100, None)
);
// `1980-01-01 00:00:00.010000000 UTC`.
assert_eq!(
FileTime::new(119_600_064_000_100_000)
.to_dos_date_time(None)
.unwrap(),
(0x0021, u16::MIN, 1, None)
);
// `1980-01-01 00:00:00.100000000 UTC`.
assert_eq!(
FileTime::new(119_600_064_001_000_000)
.to_dos_date_time(None)
.unwrap(),
(0x0021, u16::MIN, 10, None)
);
// `1980-01-01 00:00:01.990000000 UTC`.
assert_eq!(
FileTime::new(119_600_064_019_900_000)
.to_dos_date_time(None)
.unwrap(),
(0x0021, u16::MIN, 199, None)
);
// `1980-01-01 00:00:02 UTC`.
assert_eq!(
FileTime::new(119_600_064_020_000_000)
.to_dos_date_time(None)
.unwrap(),
(0x0021, 0x0001, u8::MIN, None)
);
// <https://devblogs.microsoft.com/oldnewthing/20030905-02/?p=42653>.
//
// From `2002-11-27 03:25:00 UTC` to `2002-11-26 19:25:00 -08:00`.
assert_eq!(
FileTime::new(126_828_411_000_000_000)
.to_dos_date_time(Some(offset!(-08:00)))
.unwrap(),
(0x2d7a, 0x9b20, u8::MIN, Some(offset!(-08:00)))
);
// From `2002-11-27 03:25:00 UTC` to `2002-11-26 19:25:00 -08:00`.
assert_eq!(
FileTime::new(126_828_411_000_000_000)
.to_dos_date_time(Some(offset!(-08)))
.unwrap(),
(0x2d7a, 0x9b20, u8::MIN, Some(offset!(-08)))
);
// `2002-11-27 03:25:00 UTC`.
//
// When the UTC offset is not a multiple of 15 minute intervals, returns the UTC
// date and time.
assert_eq!(
FileTime::new(126_828_411_000_000_000)
.to_dos_date_time(Some(offset!(-08:00:01)))
.unwrap(),
(0x2d7b, 0x1b20, u8::MIN, None)
);
// `2002-11-27 03:25:00 UTC`.
//
// When the UTC offset is not a multiple of 15 minute intervals, returns the UTC
// date and time.
assert_eq!(
FileTime::new(126_828_411_000_000_000)
.to_dos_date_time(Some(offset!(-08:01)))
.unwrap(),
(0x2d7b, 0x1b20, u8::MIN, None)
);
// `2002-11-27 03:25:00 UTC`.
//
// When the UTC offset is not a multiple of 15 minute intervals, returns the UTC
// date and time.
assert_eq!(
FileTime::new(126_828_411_000_000_000)
.to_dos_date_time(Some(offset!(-08:14)))
.unwrap(),
(0x2d7b, 0x1b20, u8::MIN, None)
);
// `2002-11-27 03:25:00 UTC`.
//
// When the UTC offset is not a multiple of 15 minute intervals, returns the UTC
// date and time.
assert_eq!(
FileTime::new(126_828_411_000_000_000)
.to_dos_date_time(Some(offset!(-08:14:59)))
.unwrap(),
(0x2d7b, 0x1b20, u8::MIN, None)
);
// From `2002-11-27 03:25:00 UTC` to `2002-11-26 19:10:00 -08:15`.
assert_eq!(
FileTime::new(126_828_411_000_000_000)
.to_dos_date_time(Some(offset!(-08:15)))
.unwrap(),
(0x2d7a, 0x9940, u8::MIN, Some(offset!(-08:15)))
);
// `2002-11-27 03:25:00 UTC`.
assert_eq!(
FileTime::new(126_828_411_000_000_000)
.to_dos_date_time(Some(UtcOffset::UTC))
.unwrap(),
(0x2d7b, 0x1b20, u8::MIN, Some(UtcOffset::UTC))
);
// `2002-11-27 03:25:00 UTC`.
assert_eq!(
FileTime::new(126_828_411_000_000_000)
.to_dos_date_time(Some(offset!(+00:00)))
.unwrap(),
(0x2d7b, 0x1b20, u8::MIN, Some(UtcOffset::UTC))
);
// From `1980-01-01 00:00:00 UTC` to `1980-01-01 15:45:00 +15:45`.
assert_eq!(
FileTime::new(119_600_064_000_000_000)
.to_dos_date_time(Some(offset!(+15:45)))
.unwrap(),
(0x0021, 0x7da0, u8::MIN, Some(offset!(+15:45)))
);
// From `2107-12-31 23:59:58 UTC` to `2107-12-31 07:59:58 -16:00`.
assert_eq!(
FileTime::new(159_992_927_980_000_000)
.to_dos_date_time(Some(offset!(-16:00)))
.unwrap(),
(0xff9f, 0x3f7d, u8::MIN, Some(offset!(-16:00)))
);
}
#[cfg(feature = "std")]
#[test_strategy::proptest]
fn to_dos_date_time_roundtrip(
#[strategy(119_600_064_000_000_000..=159_992_927_980_000_000_u64)] ft: u64,
) {
use proptest::prop_assert;
prop_assert!(FileTime::new(ft).to_dos_date_time(None).is_ok());
}
#[test]
fn to_dos_date_time_with_too_big_date_time() {
// `2108-01-01 00:00:00 UTC`.
assert_eq!(
FileTime::new(159_992_928_000_000_000)
.to_dos_date_time(None)
.unwrap_err(),
DosDateTimeRangeErrorKind::Overflow.into()
);
// `2107-12-31 23:00:00 UTC`.
assert_eq!(
FileTime::new(159_992_892_000_000_000)
.to_dos_date_time(Some(offset!(+01:00)))
.unwrap_err(),
DosDateTimeRangeErrorKind::Overflow.into()
);
}
#[cfg(feature = "std")]
#[test_strategy::proptest]
fn to_dos_date_time_with_too_big_date_time_roundtrip(
#[strategy(159_992_928_000_000_000_u64..)] ft: u64,
) {
use proptest::prop_assert_eq;
prop_assert_eq!(
FileTime::new(ft).to_dos_date_time(None).unwrap_err(),
DosDateTimeRangeErrorKind::Overflow.into()
);
}
#[test]
#[should_panic]
#[allow(clippy::should_panic_without_expect)]
fn to_dos_date_time_with_invalid_positive_offset() {
// From `1980-01-01 00:00:00 UTC` to `1980-01-01 16:00:00 +16:00`.
let _: (u16, u16, u8, Option<UtcOffset>) = FileTime::new(119_600_064_000_000_000)
.to_dos_date_time(Some(offset!(+16:00)))
.unwrap();
}
#[test]
#[should_panic]
#[allow(clippy::should_panic_without_expect)]
fn to_dos_date_time_with_invalid_negative_offset() {
// From `2107-12-31 23:59:58 UTC` to `2107-12-31 07:44:58 -16:15`.
let _: (u16, u16, u8, Option<UtcOffset>) = FileTime::new(159_992_927_980_000_000)
.to_dos_date_time(Some(offset!(-16:15)))
.unwrap();
}
#[test]
fn from_dos_date_time() {
// `1980-01-01 00:00:00 UTC`.
assert_eq!(
FileTime::from_dos_date_time(0x0021, u16::MIN, None, None).unwrap(),
FileTime::new(119_600_064_000_000_000)
);
// `1980-01-01 00:00:01 UTC`.
assert_eq!(
FileTime::from_dos_date_time(0x0021, u16::MIN, Some(100), None).unwrap(),
FileTime::new(119_600_064_010_000_000)
);
// <https://github.com/zip-rs/zip/blob/v0.6.4/src/types.rs#L553-L569>.
//
// `2018-11-17 10:38:30 UTC`.
assert_eq!(
FileTime::from_dos_date_time(0x4d71, 0x54cf, None, None).unwrap(),
FileTime::new(131_869_247_100_000_000)
);
// `2107-12-31 23:59:58 UTC`.
assert_eq!(
FileTime::from_dos_date_time(0xff9f, 0xbf7d, None, None).unwrap(),
FileTime::new(159_992_927_980_000_000)
);
// `2107-12-31 23:59:59 UTC`.
assert_eq!(
FileTime::from_dos_date_time(0xff9f, 0xbf7d, Some(100), None).unwrap(),
FileTime::new(159_992_927_990_000_000)
);
// `1980-01-01 00:00:00.010000000 UTC`.
assert_eq!(
FileTime::from_dos_date_time(0x0021, u16::MIN, Some(1), None).unwrap(),
FileTime::new(119_600_064_000_100_000)
);
// `1980-01-01 00:00:00.100000000 UTC`.
assert_eq!(
FileTime::from_dos_date_time(0x0021, u16::MIN, Some(10), None).unwrap(),
FileTime::new(119_600_064_001_000_000)
);
// `1980-01-01 00:00:01.990000000 UTC`.
assert_eq!(
FileTime::from_dos_date_time(0x0021, u16::MIN, Some(199), None).unwrap(),
FileTime::new(119_600_064_019_900_000)
);
// <https://devblogs.microsoft.com/oldnewthing/20030905-02/?p=42653>.
//
// From `2002-11-26 19:25:00 -08:00` to `2002-11-27 03:25:00 UTC`.
assert_eq!(
FileTime::from_dos_date_time(0x2d7a, 0x9b20, None, Some(offset!(-08:00))).unwrap(),
FileTime::new(126_828_411_000_000_000)
);
// From `2002-11-26 19:25:00 -08:00` to `2002-11-27 03:25:00 UTC`.
assert_eq!(
FileTime::from_dos_date_time(0x2d7a, 0x9b20, None, Some(offset!(-08))).unwrap(),
FileTime::new(126_828_411_000_000_000)
);
// From `2002-11-26 19:25:00 -08:00:01` to `2002-11-26 19:25:00 UTC`.
//
// When the UTC offset is not a multiple of 15 minute intervals, assumes the
// provided date and time is in UTC.
assert_eq!(
FileTime::from_dos_date_time(0x2d7a, 0x9b20, None, Some(offset!(-08:00:01))).unwrap(),
FileTime::new(126_828_123_000_000_000)
);
// From `2002-11-26 19:25:00 -08:01` to `2002-11-26 19:25:00 UTC`.
//
// When the UTC offset is not a multiple of 15 minute intervals, assumes the
// provided date and time is in UTC.
assert_eq!(
FileTime::from_dos_date_time(0x2d7a, 0x9b20, None, Some(offset!(-08:01))).unwrap(),
FileTime::new(126_828_123_000_000_000)
);
// From `2002-11-26 19:25:00 -08:14` to `2002-11-26 19:25:00 UTC`.
//
// When the UTC offset is not a multiple of 15 minute intervals, assumes the
// provided date and time is in UTC.
assert_eq!(
FileTime::from_dos_date_time(0x2d7a, 0x9b20, None, Some(offset!(-08:14))).unwrap(),
FileTime::new(126_828_123_000_000_000)
);
// From `2002-11-26 19:25:00 -08:14:59` to `2002-11-26 19:25:00 UTC`.
//
// When the UTC offset is not a multiple of 15 minute intervals, assumes the
// provided date and time is in UTC.
assert_eq!(
FileTime::from_dos_date_time(0x2d7a, 0x9b20, None, Some(offset!(-08:14:59))).unwrap(),
FileTime::new(126_828_123_000_000_000)
);
// From `2002-11-26 19:25:00 -08:15` to `2002-11-27 03:40:00 UTC`.
assert_eq!(
FileTime::from_dos_date_time(0x2d7a, 0x9b20, None, Some(offset!(-08:15))).unwrap(),
FileTime::new(126_828_420_000_000_000)
);
// `2002-11-26 19:25:00 UTC`.
assert_eq!(
FileTime::from_dos_date_time(0x2d7a, 0x9b20, None, Some(UtcOffset::UTC)).unwrap(),
FileTime::new(126_828_123_000_000_000)
);
// `2002-11-26 19:25:00 UTC`.
assert_eq!(
FileTime::from_dos_date_time(0x2d7a, 0x9b20, None, Some(offset!(+00:00))).unwrap(),
FileTime::new(126_828_123_000_000_000)
);
// From `2107-12-31 23:59:58 +15:45` to `2107-12-31 08:14:58 UTC`.
assert_eq!(
FileTime::from_dos_date_time(0xff9f, 0xbf7d, None, Some(offset!(+15:45))).unwrap(),
FileTime::new(159_992_360_980_000_000)
);
// From `1980-01-01 00:00:00 -16:00` to `1980-01-01 16:00:00 UTC`.
assert_eq!(
FileTime::from_dos_date_time(0x0021, u16::MIN, None, Some(offset!(-16:00))).unwrap(),
FileTime::new(119_600_640_000_000_000)
);
}
#[cfg(feature = "std")]
#[test_strategy::proptest]
fn from_dos_date_time_roundtrip(
#[strategy(1980..=2107_u16)] year: u16,
#[strategy(1..=12_u8)] month: u8,
#[strategy(1..=31_u8)] day: u8,
#[strategy(..=23_u8)] hour: u8,
#[strategy(..=59_u8)] minute: u8,
#[strategy(..=58_u8)] second: u8,
) {
use proptest::{prop_assert, prop_assume};
prop_assume!(Date::from_calendar_date(year.into(), month.try_into().unwrap(), day).is_ok());
prop_assume!(Time::from_hms(hour, minute, second).is_ok());
let date = u16::from(day) + (u16::from(month) << 5) + ((year - 1980) << 9);
let time = u16::from(second / 2) + (u16::from(minute) << 5) + (u16::from(hour) << 11);
prop_assert!(FileTime::from_dos_date_time(date, time, None, None).is_ok());
}
#[test]
fn from_dos_date_time_with_invalid_date_time() {
// The Day field is 0.
assert!(FileTime::from_dos_date_time(0x0020, u16::MIN, None, None).is_err());
// The Day field is 30, which is after the last day of February.
assert!(FileTime::from_dos_date_time(0x005e, u16::MIN, None, None).is_err());
// The Month field is 0.
assert!(FileTime::from_dos_date_time(0x0001, u16::MIN, None, None).is_err());
// The Month field is 13.
assert!(FileTime::from_dos_date_time(0x01a1, u16::MIN, None, None).is_err());
// The DoubleSeconds field is 30.
assert!(FileTime::from_dos_date_time(0x0021, 0x001e, None, None).is_err());
// The Minute field is 60.
assert!(FileTime::from_dos_date_time(0x0021, 0x0780, None, None).is_err());
// The Hour field is 24.
assert!(FileTime::from_dos_date_time(0x0021, 0xc000, None, None).is_err());
}
#[test]
#[should_panic]
#[allow(clippy::should_panic_without_expect)]
fn from_dos_date_time_with_invalid_resolution() {
let _: FileTime = FileTime::from_dos_date_time(0x0021, u16::MIN, Some(200), None).unwrap();
}
#[test]
#[should_panic]
#[allow(clippy::should_panic_without_expect)]
fn from_dos_date_time_with_invalid_positive_offset() {
// From `2107-12-31 23:59:58 +16:00` to `2107-12-31 07:59:58 UTC`.
let _: FileTime =
FileTime::from_dos_date_time(0xff9f, 0xbf7d, None, Some(offset!(+16:00))).unwrap();
}
#[test]
#[should_panic]
#[allow(clippy::should_panic_without_expect)]
fn from_dos_date_time_with_invalid_negative_offset() {
// From `1980-01-01 00:00:00 -16:15` to `1980-01-01 16:15:00 UTC`.
let _: FileTime =
FileTime::from_dos_date_time(0x0021, u16::MIN, None, Some(offset!(-16:15))).unwrap();
}
}