C3/Src/CebuLoader/WindowsVersion.cpp

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#include "stdafx.h"
#include "WindowsVersion.h"
namespace MWR::Loader
{
WinVersion g_WinVer;
namespace
{
static bool versionInitialized = false;
void InitVersion()
{
if (versionInitialized)
return;
g_WinVer.native.dwOSVersionInfoSize = sizeof(g_WinVer.native);
using fnRtlGetVersion = NTSTATUS(NTAPI*)(PRTL_OSVERSIONINFOEXW lpVersionInformation);
auto RtlGetVersion = (fnRtlGetVersion)GetProcAddress(GetModuleHandleW(L"ntdll.dll"), "RtlGetVersion");
if (RtlGetVersion)
{
RtlGetVersion(&g_WinVer.native);
}
if (g_WinVer.native.dwMajorVersion != 0)
{
auto fullver = (g_WinVer.native.dwMajorVersion << 8) | g_WinVer.native.dwMinorVersion;
switch (fullver)
{
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case Win32WinNtWIN10:
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if (g_WinVer.native.dwBuildNumber >= Build_RS6)
g_WinVer.ver = Win10_RS6;
else if (g_WinVer.native.dwBuildNumber >= Build_RS5)
g_WinVer.ver = Win10_RS5;
else if (g_WinVer.native.dwBuildNumber >= Build_RS4)
g_WinVer.ver = Win10_RS4;
else if (g_WinVer.native.dwBuildNumber >= Build_RS3)
g_WinVer.ver = Win10_RS3;
else if (g_WinVer.native.dwBuildNumber >= Build_RS2)
g_WinVer.ver = Win10_RS2;
else if (g_WinVer.native.dwBuildNumber >= Build_RS1)
g_WinVer.ver = Win10_RS1;
else if (g_WinVer.native.dwBuildNumber >= Build_RS0)
g_WinVer.ver = Win10;
break;
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case Win32WinNtWINBLUE:
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g_WinVer.ver = Win8Point1;
break;
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case Win32WinNtWIN8:
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g_WinVer.ver = Win8;
break;
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case Win32WinNtWIN7:
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g_WinVer.ver = Win7;
break;
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case Win32WinNtWINXP:
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g_WinVer.ver = WinXP;
break;
default:
g_WinVer.ver = WinUnsupported;
}
}
g_WinVer.revision = GetRevision();
versionInitialized = true;
}
}
WinVersion& WinVer()
{
InitVersion();
return g_WinVer;
}
bool IsWindowsVersionOrGreater(WORD wMajorVersion, WORD wMinorVersion, WORD wServicePackMajor, DWORD dwBuild)
{
auto& g_WinVer = WinVer();
if (g_WinVer.native.dwMajorVersion != 0)
{
if (g_WinVer.native.dwMajorVersion > wMajorVersion)
return true;
else if (g_WinVer.native.dwMajorVersion < wMajorVersion)
return false;
if (g_WinVer.native.dwMinorVersion > wMinorVersion)
return true;
else if (g_WinVer.native.dwMinorVersion < wMinorVersion)
return false;
if (g_WinVer.native.wServicePackMajor > wServicePackMajor)
return true;
else if (g_WinVer.native.wServicePackMajor < wServicePackMajor)
return false;
if (g_WinVer.native.dwBuildNumber >= dwBuild)
return true;
}
return false;
}
}