Muldersoft/MUtilities
Muldersoft/MUtilities
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Small improvement in get_real_os_version() function.

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This commit is contained in:
LoRd_MuldeR 2016-05-16 17:05:59 +02:00
parent cb53f41a01
commit 2e22f8ff4b
2 changed files with 39 additions and 24 deletions
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1
.gitignore vendored
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@ -11,3 +11,4 @@
/obj /obj
/out /out
/tmp /tmp
*.db

42
src/OSSupport_Win32.cpp
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@ -304,33 +304,43 @@ namespace MUtils
bool os_version_t::operator<= (const os_version_t &rhs) const { return (type == rhs.type) && ((versionMajor < rhs.versionMajor) || ((versionMajor == rhs.versionMajor) && (versionMinor <= rhs.versionMinor))); } bool os_version_t::operator<= (const os_version_t &rhs) const { return (type == rhs.type) && ((versionMajor < rhs.versionMajor) || ((versionMajor == rhs.versionMajor) && (versionMinor <= rhs.versionMinor))); }
//Known Windows NT versions //Known Windows NT versions
const os_version_t WINDOWS_WIN2K = { OS_WINDOWS, 5, 0 }; // 2000 const os_version_t WINDOWS_WIN2K = { OS_WINDOWS, 5, 0, 2195 }; // 2000
const os_version_t WINDOWS_WINXP = { OS_WINDOWS, 5, 1 }; // XP const os_version_t WINDOWS_WINXP = { OS_WINDOWS, 5, 1, 2600 }; // XP
const os_version_t WINDOWS_XPX64 = { OS_WINDOWS, 5, 2 }; // XP_x64 const os_version_t WINDOWS_XPX64 = { OS_WINDOWS, 5, 2, 3790 }; // XP_x64
const os_version_t WINDOWS_VISTA = { OS_WINDOWS, 6, 0 }; // Vista const os_version_t WINDOWS_VISTA = { OS_WINDOWS, 6, 0, 6000 }; // Vista
const os_version_t WINDOWS_WIN70 = { OS_WINDOWS, 6, 1 }; // 7 const os_version_t WINDOWS_WIN70 = { OS_WINDOWS, 6, 1, 7600 }; // 7
const os_version_t WINDOWS_WIN80 = { OS_WINDOWS, 6, 2 }; // 8 const os_version_t WINDOWS_WIN80 = { OS_WINDOWS, 6, 2, 9200 }; // 8
const os_version_t WINDOWS_WIN81 = { OS_WINDOWS, 6, 3 }; // 8.1 const os_version_t WINDOWS_WIN81 = { OS_WINDOWS, 6, 3, 9600 }; // 8.1
const os_version_t WINDOWS_WN100 = { OS_WINDOWS, 10, 0 }; // 10 const os_version_t WINDOWS_WN100 = { OS_WINDOWS, 10, 0, 10240 }; // 10
//Unknown OS //Unknown OS
const os_version_t UNKNOWN_OPSYS = { OS_UNKNOWN, 0, 0 }; // N/A const os_version_t UNKNOWN_OPSYS = { OS_UNKNOWN, 0, 0, 0 }; // N/A
} }
} }
} }
static inline DWORD SAFE_ADD(const DWORD &a, const DWORD &b) static inline DWORD SAFE_ADD(const DWORD &a, const DWORD &b, const DWORD &limit = MAXDWORD)
{ {
const DWORD temp = a + b; return ((a >= limit) || (b >= limit) || ((limit - a) <= b)) ? limit : (a + b);
return ((temp >= a) && (temp >= b)) ? temp : MAXDWORD;
} }
static void initialize_os_version(OSVERSIONINFOEXW *const osInfo) static void initialize_os_version(OSVERSIONINFOEXW *const osInfo)
{ {
memset(osInfo, 0, sizeof(OSVERSIONINFOEXW)); memset(osInfo, 0, sizeof(OSVERSIONINFOEXW));
osInfo->dwOSVersionInfoSize = sizeof(OSVERSIONINFOEXW); osInfo->dwOSVersionInfoSize = sizeof(OSVERSIONINFOEXW);
} }
static inline DWORD initialize_step_size(const DWORD &limit)
{
DWORD result = 1;
while (result < limit)
{
result = SAFE_ADD(result, result);
}
return result;
}
static bool rtl_get_version(OSVERSIONINFOEXW *const osInfo) static bool rtl_get_version(OSVERSIONINFOEXW *const osInfo)
{ {
typedef LONG(__stdcall *RtlGetVersion)(LPOSVERSIONINFOEXW); typedef LONG(__stdcall *RtlGetVersion)(LPOSVERSIONINFOEXW);
@ -432,6 +442,7 @@ static bool verify_os_build(const DWORD build)
static bool get_real_os_version(unsigned int *major, unsigned int *minor, unsigned int *build, bool *pbOverride) static bool get_real_os_version(unsigned int *major, unsigned int *minor, unsigned int *build, bool *pbOverride)
{ {
static const DWORD MAX_VERSION = 0xFFFF; static const DWORD MAX_VERSION = 0xFFFF;
static const DWORD MAX_BUILDNO = MAXINT;
*major = *minor = *build = 0; *major = *minor = *build = 0;
*pbOverride = false; *pbOverride = false;
@ -496,8 +507,10 @@ static bool get_real_os_version(unsigned int *major, unsigned int *minor, unsign
} }
//Build Version //Build Version
DWORD stepSize = 32768; if (verify_os_build(SAFE_ADD((*build), 1, MAX_BUILDNO)))
for (DWORD nextBuildNo = SAFE_ADD((*build), stepSize); (*build) < MAXDWORD; nextBuildNo = SAFE_ADD((*build), stepSize)) {
DWORD stepSize = initialize_step_size(MAX_BUILDNO);
for (DWORD nextBuildNo = SAFE_ADD((*build), stepSize, MAX_BUILDNO); (*build) < MAX_BUILDNO; nextBuildNo = SAFE_ADD((*build), stepSize, MAX_BUILDNO))
{ {
if (verify_os_build(nextBuildNo)) if (verify_os_build(nextBuildNo))
{ {
@ -512,6 +525,7 @@ static bool get_real_os_version(unsigned int *major, unsigned int *minor, unsign
} }
break; break;
} }
}
return true; return true;
} }