IS_MY_CONTROL_DEVICE_OBJECT

//Sfilter中常用的几个宏
//
// Macro to test if this is my device object
//
   #define IS_MY_DEVICE_OBJECT(_devObj) \
    (((_devObj) != NULL) && \
     ((_devObj)->DriverObject == gSFilterDriverObject) && \
      ((_devObj)->DeviceExtension != NULL) && \
   ((*(ULONG *)(_devObj)->DeviceExtension) == SFLT_POOL_TAG))

//
// Macro to test if this is my control device object
//

#define IS_MY_CONTROL_DEVICE_OBJECT(_devObj) \
    (((_devObj) == gSFilterControlDeviceObject) ? \
            (ASSERT(((_devObj)->DriverObject == gSFilterDriverObject) && \
                    ((_devObj)->DeviceExtension == NULL)), TRUE) : \
            FALSE)

//
// Macro to test for device types we want to attach to
//

#define IS_DESIRED_DEVICE_TYPE(_type) \
    (((_type) == FILE_DEVICE_DISK_FILE_SYSTEM) || \
     ((_type) == FILE_DEVICE_CD_ROM_FILE_SYSTEM) || \
     ((_type) == FILE_DEVICE_NETWORK_FILE_SYSTEM))

//
// Macro to test if FAST_IO_DISPATCH handling routine is valid
//

#define VALID_FAST_IO_DISPATCH_HANDLER(_FastIoDispatchPtr, _FieldName) \
    (((_FastIoDispatchPtr) != NULL) && \
     (((_FastIoDispatchPtr)->SizeOfFastIoDispatch) >= \
            (FIELD_OFFSET(FAST_IO_DISPATCH, _FieldName) + sizeof(void *))) && \
     ((_FastIoDispatchPtr)->_FieldName != NULL))
//
// MULTIVERSION NOTE: For this version of the driver, we need to know the
// current OS version while we are running to make decisions regarding what
// logic to use when the logic cannot be the same for all platforms. We
// will look up the OS version in DriverEntry and store the values
// in these global variables.
//

ULONG gSfOsMajorVersion = 0;
ULONG gSfOsMinorVersion = 0;//Call kernel API (PsGetVersion() etc)to initialize the variable

//
// Here is what the major and minor versions should be for the various OS versions:
//
// OS Name                                 MajorVersion    MinorVersion
// ---------------------------------
// Windows 2000                             5                 0
// Windows XP                               5                 1
// Windows Server 2003                      5                 2
//

#define IS_WINDOWS2000() \
    ((gSfOsMajorVersion == 5) && (gSfOsMinorVersion == 0))

#define IS_WINDOWSXP() \
    ((gSfOsMajorVersion == 5) && (gSfOsMinorVersion == 1))

#define IS_WINDOWSXP_OR_LATER() \
    (((gSfOsMajorVersion == 5) && (gSfOsMinorVersion >= 1)) || \
     (gSfOsMajorVersion > 5))

#define IS_WINDOWSSRV2003_OR_LATER() \
    (((gSfOsMajorVersion == 5) && (gSfOsMinorVersion >= 2)) || \
     (gSfOsMajorVersion > 5))