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46 lines
1.9 KiB
Zig
46 lines
1.9 KiB
Zig
// SPDX-License-Identifier: MIT
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// Copyright (c) 2015-2020 Zig Contributors
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// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
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// The MIT license requires this copyright notice to be included in all copies
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// and substantial portions of the software.
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const std = @import("std");
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pub const WindowsVersion = std.Target.Os.WindowsVersion;
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/// Returns the highest known WindowsVersion deduced from reported runtime information.
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/// Discards information about in-between versions we don't differentiate.
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pub fn detectRuntimeVersion() WindowsVersion {
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var version_info: std.os.windows.RTL_OSVERSIONINFOW = undefined;
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version_info.dwOSVersionInfoSize = @sizeOf(@TypeOf(version_info));
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switch (std.os.windows.ntdll.RtlGetVersion(&version_info)) {
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.SUCCESS => {},
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else => unreachable,
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}
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// Starting from the system infos build a NTDDI-like version
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// constant whose format is:
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// B0 B1 B2 B3
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// `---` `` ``--> Sub-version (Starting from Windows 10 onwards)
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// \ `--> Service pack (Always zero in the constants defined)
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// `--> OS version (Major & minor)
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const os_ver: u16 = @intCast(u16, version_info.dwMajorVersion & 0xff) << 8 |
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@intCast(u16, version_info.dwMinorVersion & 0xff);
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const sp_ver: u8 = 0;
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const sub_ver: u8 = if (os_ver >= 0x0A00) subver: {
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// There's no other way to obtain this info beside
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// checking the build number against a known set of
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// values
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var last_idx: usize = 0;
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for (WindowsVersion.known_win10_build_numbers) |build, i| {
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if (version_info.dwBuildNumber >= build)
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last_idx = i;
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}
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break :subver @truncate(u8, last_idx);
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} else 0;
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const version: u32 = @as(u32, os_ver) << 16 | @as(u16, sp_ver) << 8 | sub_ver;
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return @intToEnum(WindowsVersion, version);
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}
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