[WDF] Add Windows Driver Framework files

Takern from Microsoft GitHub repo:
d9c6040fe9

Licensed under MIT

sdk/lib/drivers/wdf/shared/inc/private/common/fxrequestcallbacks.hpp

@@ -0,0 +1,99 @@
+/*++
+
+Copyright (c) Microsoft Corporation
+
+Module Name:
+
+    FxIoQueueCallbacks.h
+
+Abstract:
+
+    This module implements the I/O package queue object callbacks
+
+Author:
+
+
+
+
+Environment:
+
+    Both kernel and user mode
+
+Revision History:
+
+--*/
+
+#ifndef _FXREQUESTCALLBACKS_H_
+#define _FXREQUESTCALLBACKS_H_
+
+
+//
+// Delegate which contains EvtRequestCancel
+//
+class FxRequestCancelCallback : public FxCallback {
+
+public:
+    PFN_WDF_REQUEST_CANCEL m_Cancel;
+
+    FxRequestCancelCallback(
+        VOID
+        )
+    {
+        m_Cancel = NULL;
+    }
+
+    void
+    InvokeCancel(
+        __in FxCallbackLock* Lock,
+        __in WDFREQUEST Request
+        )
+    {
+        if (m_Cancel != NULL) {
+            PFN_WDF_REQUEST_CANCEL pMethod;
+            KIRQL irql;
+
+            //
+            // Satisfy W4 warning, even though it is technically not necessary to
+            // assign an initial value.
+            //
+            irql = PASSIVE_LEVEL;
+
+            if (Lock != NULL) {
+                Lock->Lock(&irql);
+            }
+
+            //
+            // Clear the value before invoking the routine since the assignment
+            // is invalidated when the routine is run.
+            //
+            pMethod = m_Cancel;
+            m_Cancel = NULL;
+
+            pMethod(Request);
+
+            if (Lock != NULL) {
+                Lock->Unlock(irql);
+            }
+        }
+    }
+};
+
+//
+// Delegate which contains EvtRequestCompletion
+//
+class FxRequestCompletionCallback : public FxCallback {
+
+public:
+    PFN_WDF_REQUEST_COMPLETION_ROUTINE m_Completion;
+
+    FxRequestCompletionCallback(
+        VOID
+        )
+    {
+        m_Completion = NULL;
+    }
+};
+
+
+#endif // _FXREQUESTCALLBACKS_H_
+