bp3d-os 2.2.3

Operating System tools designed for BlockProject3D
Documentation 
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// Copyright (c) 2023, BlockProject 3D
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
//     * Redistributions of source code must retain the above copyright notice,
//       this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright notice,
//       this list of conditions and the following disclaimer in the documentation
//       and/or other materials provided with the distribution.
//     * Neither the name of BlockProject 3D nor the names of its contributors
//       may be used to endorse or promote products derived from this software
//       without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

use std::mem::MaybeUninit;

use time::{OffsetDateTime, UtcOffset};
use windows_sys::Win32::System::{
    SystemServices::{TIME_ZONE_ID_DAYLIGHT, TIME_ZONE_ID_STANDARD, TIME_ZONE_ID_UNKNOWN},
    Time::GetTimeZoneInformation,
};

pub fn local_offset_at(_: &OffsetDateTime) -> Option<UtcOffset> {
    let mut info = MaybeUninit::uninit();
    unsafe {
        let res = GetTimeZoneInformation(info.as_mut_ptr());
        let offset = match res {
            TIME_ZONE_ID_UNKNOWN => info.assume_init().Bias,
            TIME_ZONE_ID_DAYLIGHT => {
                let info = info.assume_init();
                info.Bias + info.DaylightBias
            }
            TIME_ZONE_ID_STANDARD => {
                let info = info.assume_init();
                info.Bias + info.StandardBias
            }
            _ => return None,
        };
        UtcOffset::from_whole_seconds(offset * -60).ok()
    }
}