1 files changed, 80 insertions, 0 deletions
diff --git a/mfbt/WindowsVersion.h b/mfbt/WindowsVersion.h
new file mode 100644
index 0000000000..c357a76d24
--- /dev/null
+++ b/mfbt/WindowsVersion.h
@@ -0,0 +1,80 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_WindowsVersion_h
+#define mozilla_WindowsVersion_h
+
+#include "mozilla/Atomics.h"
+#include "mozilla/Attributes.h"
+#include <stdint.h>
+#include <windows.h>
+
+namespace mozilla {
+
+inline bool IsWindows10BuildOrLater(uint32_t aBuild) {
+  static Atomic<uint32_t> minBuild(0);
+  static Atomic<uint32_t> maxBuild(UINT32_MAX);
+
+  if (minBuild >= aBuild) {
+    return true;
+  }
+
+  if (aBuild >= maxBuild) {
+    return false;
+  }
+
+  OSVERSIONINFOEXW info;
+  ZeroMemory(&info, sizeof(OSVERSIONINFOEXW));
+  info.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEXW);
+  info.dwMajorVersion = 10;
+  info.dwBuildNumber = aBuild;
+
+  DWORDLONG conditionMask = 0;
+  VER_SET_CONDITION(conditionMask, VER_MAJORVERSION, VER_GREATER_EQUAL);
+  VER_SET_CONDITION(conditionMask, VER_MINORVERSION, VER_GREATER_EQUAL);
+  VER_SET_CONDITION(conditionMask, VER_BUILDNUMBER, VER_GREATER_EQUAL);
+  VER_SET_CONDITION(conditionMask, VER_SERVICEPACKMAJOR, VER_GREATER_EQUAL);
+  VER_SET_CONDITION(conditionMask, VER_SERVICEPACKMINOR, VER_GREATER_EQUAL);
+
+  if (VerifyVersionInfoW(&info,
+                         VER_MAJORVERSION | VER_MINORVERSION | VER_BUILDNUMBER |
+                             VER_SERVICEPACKMAJOR | VER_SERVICEPACKMINOR,
+                         conditionMask)) {
+    minBuild = aBuild;
+    return true;
+  }
+
+  maxBuild = aBuild;
+  return false;
+}
+
+MOZ_ALWAYS_INLINE bool IsWin10AnniversaryUpdateOrLater() {
+  return IsWindows10BuildOrLater(14393);
+}
+
+MOZ_ALWAYS_INLINE bool IsWin10CreatorsUpdateOrLater() {
+  return IsWindows10BuildOrLater(15063);
+}
+
+MOZ_ALWAYS_INLINE bool IsWin10FallCreatorsUpdateOrLater() {
+  return IsWindows10BuildOrLater(16299);
+}
+
+MOZ_ALWAYS_INLINE bool IsWin10Sep2018UpdateOrLater() {
+  return IsWindows10BuildOrLater(17763);
+}
+
+MOZ_ALWAYS_INLINE bool IsWin11OrLater() {
+  return IsWindows10BuildOrLater(22000);
+}
+
+MOZ_ALWAYS_INLINE bool IsWin1122H2OrLater() {
+  return IsWindows10BuildOrLater(22621);
+}
+
+}  // namespace mozilla
+
+#endif /* mozilla_WindowsVersion_h */