1 files changed, 230 insertions, 0 deletions
diff --git a/mfbt/WindowsVersion.h b/mfbt/WindowsVersion.h
new file mode 100644
index 000000000..f8b071861
--- /dev/null
+++ b/mfbt/WindowsVersion.h
@@ -0,0 +1,230 @@
+/* -*- 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/Attributes.h"
+#include <stdint.h>
+#include <windows.h>
+
+namespace mozilla {
+
+inline bool
+IsWindowsVersionOrLater(uint32_t aVersion)
+{
+  static uint32_t minVersion = 0;
+  static uint32_t maxVersion = UINT32_MAX;
+
+  if (minVersion >= aVersion) {
+    return true;
+  }
+
+  if (aVersion >= maxVersion) {
+    return false;
+  }
+
+  OSVERSIONINFOEX info;
+  ZeroMemory(&info, sizeof(OSVERSIONINFOEX));
+  info.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
+  info.dwMajorVersion = aVersion >> 24;
+  info.dwMinorVersion = (aVersion >> 16) & 0xFF;
+  info.wServicePackMajor = (aVersion >> 8) & 0xFF;
+  info.wServicePackMinor = aVersion & 0xFF;
+
+  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_SERVICEPACKMAJOR, VER_GREATER_EQUAL);
+  VER_SET_CONDITION(conditionMask, VER_SERVICEPACKMINOR, VER_GREATER_EQUAL);
+
+  if (VerifyVersionInfo(&info,
+                        VER_MAJORVERSION | VER_MINORVERSION |
+                        VER_SERVICEPACKMAJOR | VER_SERVICEPACKMINOR,
+                        conditionMask)) {
+    minVersion = aVersion;
+    return true;
+  }
+
+  maxVersion = aVersion;
+  return false;
+}
+
+inline bool
+IsWindowsBuildOrLater(uint32_t aBuild)
+{
+  static uint32_t minBuild = 0;
+  static uint32_t maxBuild = UINT32_MAX;
+
+  if (minBuild >= aBuild) {
+    return true;
+  }
+
+  if (aBuild >= maxBuild) {
+    return false;
+  }
+
+  OSVERSIONINFOEX info;
+  ZeroMemory(&info, sizeof(OSVERSIONINFOEX));
+  info.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
+  info.dwBuildNumber = aBuild;
+
+  DWORDLONG conditionMask = 0;
+  VER_SET_CONDITION(conditionMask, VER_BUILDNUMBER, VER_GREATER_EQUAL);
+
+  if (VerifyVersionInfo(&info, VER_BUILDNUMBER, conditionMask)) {
+    minBuild = aBuild;
+    return true;
+  }
+
+  maxBuild = aBuild;
+  return false;
+}
+
+#if defined(_M_X64) || defined(_M_AMD64)
+// We support only Win7 or later on Win64.
+MOZ_ALWAYS_INLINE bool
+IsXPSP3OrLater()
+{
+  return true;
+}
+
+MOZ_ALWAYS_INLINE bool
+IsWin2003OrLater()
+{
+  return true;
+}
+
+MOZ_ALWAYS_INLINE bool
+IsWin2003SP2OrLater()
+{
+  return true;
+}
+
+MOZ_ALWAYS_INLINE bool
+IsVistaOrLater()
+{
+  return true;
+}
+
+MOZ_ALWAYS_INLINE bool
+IsVistaSP1OrLater()
+{
+  return true;
+}
+
+MOZ_ALWAYS_INLINE bool
+IsWin7OrLater()
+{
+  return true;
+}
+#else
+MOZ_ALWAYS_INLINE bool
+IsXPSP3OrLater()
+{
+  return IsWindowsVersionOrLater(0x05010300ul);
+}
+
+MOZ_ALWAYS_INLINE bool
+IsWin2003OrLater()
+{
+  return IsWindowsVersionOrLater(0x05020000ul);
+}
+
+MOZ_ALWAYS_INLINE bool
+IsWin2003SP2OrLater()
+{
+  return IsWindowsVersionOrLater(0x05020200ul);
+}
+
+MOZ_ALWAYS_INLINE bool
+IsVistaOrLater()
+{
+  return IsWindowsVersionOrLater(0x06000000ul);
+}
+
+MOZ_ALWAYS_INLINE bool
+IsVistaSP1OrLater()
+{
+  return IsWindowsVersionOrLater(0x06000100ul);
+}
+
+MOZ_ALWAYS_INLINE bool
+IsWin7OrLater()
+{
+  return IsWindowsVersionOrLater(0x06010000ul);
+}
+#endif
+
+MOZ_ALWAYS_INLINE bool
+IsWin7SP1OrLater()
+{
+  return IsWindowsVersionOrLater(0x06010100ul);
+}
+
+MOZ_ALWAYS_INLINE bool
+IsWin8OrLater()
+{
+  return IsWindowsVersionOrLater(0x06020000ul);
+}
+
+MOZ_ALWAYS_INLINE bool
+IsWin8Point1OrLater()
+{
+  return IsWindowsVersionOrLater(0x06030000ul);
+}
+
+MOZ_ALWAYS_INLINE bool
+IsWin10OrLater()
+{
+  return IsWindowsVersionOrLater(0x0a000000ul);
+}
+
+MOZ_ALWAYS_INLINE bool
+IsNotWin7PreRTM()
+{
+  return IsWin7SP1OrLater() || !IsWin7OrLater() ||
+         IsWindowsBuildOrLater(7600);
+}
+
+MOZ_ALWAYS_INLINE bool
+IsWin7AndPre2000Compatible() {
+  /*
+   * See Bug 1279171.
+   * We'd like to avoid using WMF on specific OS version when compatibility
+   * mode is in effect. The purpose of this function is to check if FF runs on
+   * Win7 OS with application compatibility mode being set to 95/98/ME.
+   * Those compatibility mode options (95/98/ME) can only display and
+   * be selected for 32-bit application.
+   * If the compatibility mode is in effect, the GetVersionEx function will
+   * report the OS as it identifies itself, which may not be the OS that is
+   * installed.
+   * Note : 1) We only target for Win7 build number greater than 7600.
+   *        2) GetVersionEx may be altered or unavailable for release after
+   *           Win8.1. Set pragma to avoid build warning as error.
+   */
+  bool isWin7 = IsNotWin7PreRTM() && !IsWin8OrLater();
+  if (!isWin7) {
+    return false;
+  }
+
+  OSVERSIONINFOEX info;
+  ZeroMemory(&info, sizeof(OSVERSIONINFOEX));
+
+  info.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
+#pragma warning(push)
+#pragma warning(disable:4996)
+  bool success = GetVersionEx((LPOSVERSIONINFO) &info);
+#pragma warning(pop)
+  if (!success) {
+    return false;
+  }
+  return info.dwMajorVersion < 5;
+}
+
+} // namespace mozilla
+
+#endif /* mozilla_WindowsVersion_h */