sdk/lib/drivers/rtlver/rtl.c

   1 /*
   2  * PROJECT:         ReactOS Kernel - Vista+ APIs
   3  * LICENSE:         GPL v2 - See COPYING in the top level directory
   4  * FILE:            lib/drivers/ntoskrnl_vista/rtl.c
   5  * PURPOSE:         Implementation of RtlIsNtDdiVersionAvailable and RtlIsServicePackVersionInstalled
   6  * PROGRAMMERS:     Pierre Schweitzer <pierre@reactos.org>
   7  */
   8
   9 #include <ntdef.h>
  10 #include <ntifs.h>
  11
  12 BOOLEAN
  13 WdmlibRtlIsNtDdiVersionAvailable(
  14     _In_ ULONG Version)
  15 {
  16     UNICODE_STRING ImportName;
  17     ULONG Major, Minor, Current;
  18     BOOLEAN (NTAPI *pRtlIsNtDdiVersionAvailable)(ULONG Version);
  19
  20     /* Try to use ntoskrnl version if available */
  21     RtlInitUnicodeString(&ImportName, L"RtlIsNtDdiVersionAvailable");
  22     pRtlIsNtDdiVersionAvailable = MmGetSystemRoutineAddress(&ImportName);
  23     if (pRtlIsNtDdiVersionAvailable)
  24     {
  25         return pRtlIsNtDdiVersionAvailable(Version);
  26     }
  27
  28     /* Only provide OS version. No SP */
  29     if (SPVER(Version) || SUBVER(Version))
  30     {
  31         return FALSE;
  32     }
  33
  34     /* Compute the version and compare */
  35     Major = 0;
  36     Minor = 0;
  37     PsGetVersion(&Major, &Minor, NULL, NULL);
  38     Current = (Minor + (Major << 8)) << 16;
  39
  40     return (Current >= Version);
  41 }