RtlGetExtendedContextLength2

NTSTATUS __fastcall RtlGetExtendedContextLength2(UINT64 ContextFlags, _DWORD *a2, INT64 a3){
  unsigned int v5; 
  NTSTATUS result; 
  int v7; 
  int v8; 
  UINT64 ContextAlign[3]; 
  UINT64 ContextLength; 

  ContextAlign[0] = 0i64;
  LODWORD(ContextLength) = 0;
  v5 = ContextFlags;
  result = RtlpValidateContextFlags(ContextFlags, (UINT64 *)((char *)ContextAlign + 4));
  if( result >= 0 )
  {
    RtlpGetLegacyContextLength(v5, &ContextLength, ContextAlign);
    v7 = ContextAlign[0];
    v8 = ContextLength + 24;
    if( (ContextAlign[0] & 0x200000000i64) != 0 )
    {
      if( (KUSER_SHARED_DATA.XState._bf_0 & 2) != 0 )
        a3 &= KUSER_SHARED_DATA.XState.EnabledFeatures | KUSER_SHARED_DATA.XState.EnabledUserVisibleSupervisorFeatures | 0x8000000000000000ui64;
      v8 = (~(v7 - 1) & (v8 + v7 - 1)) - v7 - 448 + RtlpGetEntireXStateAreaLength(a3);
    }
    *a2 = v7 + v8 - 1;
    return 0;
  }
  return result;
}

Referenced by: