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      1 /*
      2  * Copyright (C) 2009 Apple Inc. All Rights Reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include <windows.h>
     27 
     28 #if _WIN32_WINNT_WINBLUE
     29 #include <versionhelpers.h>
     30 #endif
     31 
     32 namespace rx {
     33 
     34 #ifndef _WIN32_WINNT_WINBLUE
     35 static bool IsWindowsVistaOrGreater()
     36 {
     37     OSVERSIONINFOEXW osvi = { };
     38     osvi.dwOSVersionInfoSize = sizeof(osvi);
     39     osvi.dwMajorVersion = HIBYTE(_WIN32_WINNT_VISTA);
     40     osvi.dwMinorVersion = LOBYTE(_WIN32_WINNT_VISTA);
     41     DWORDLONG condition = 0;
     42     VER_SET_CONDITION(condition, VER_MAJORVERSION, VER_GREATER_EQUAL);
     43     VER_SET_CONDITION(condition, VER_MINORVERSION, VER_GREATER_EQUAL);
     44     return !!::VerifyVersionInfoW(&osvi, VER_MAJORVERSION | VER_MINORVERSION, condition);
     45 }
     46 #endif
     47 
     48 bool isWindowsVistaOrGreater()
     49 {
     50     static bool initialized = false;
     51     static bool cachedIsWindowsVistaOrGreater;
     52 
     53     if (!initialized) {
     54         initialized = true;
     55         cachedIsWindowsVistaOrGreater = IsWindowsVistaOrGreater();
     56     }
     57     return cachedIsWindowsVistaOrGreater;
     58 }
     59 
     60 } // namespace rx
     61