Introduce SetupAPI - Windows device and driver management API

Signed-off-by: Simon Rozman <simon@rozman.si>

setupapi/setupapi_windows.go

@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
+ */
+
+package setupapi
+
+import (
+	"golang.org/x/sys/windows"
+)
+
+const (
+	SP_MAX_MACHINENAME_LENGTH = windows.MAX_PATH + 3
+)
+
+type DIGCF uint32
+
+const (
+	Default         DIGCF = 0x00000001
+	Present         DIGCF = 0x00000002
+	AllClasses      DIGCF = 0x00000004
+	Profile         DIGCF = 0x00000008
+	DeviceInterface DIGCF = 0x00000010
+	InterfaceDevice DIGCF = 0x00000010
+)
+
+type DevInfo windows.Handle
+
+//sys	setupDiGetClassDevsEx(ClassGuid *windows.GUID, Enumerator *string, hwndParent uintptr, Flags uint32, DeviceInfoSet uintptr, MachineName string, reserved uint32) (handle windows.Handle, err error) = setupapi.SetupDiGetClassDevsExW
+
+// The SetupDiGetClassDevsEx function returns a handle to a device information set that contains requested device information elements for a local or a remote computer.
+func SetupDiGetClassDevsEx(ClassGuid *windows.GUID, Enumerator string, hwndParent uintptr, Flags DIGCF, DeviceInfoSet DevInfo, MachineName string) (DevInfo, error) {
+	enumerator := &Enumerator
+
+	if Enumerator == "" {
+		enumerator = nil
+	}
+
+	h, err := setupDiGetClassDevsEx(ClassGuid, enumerator, hwndParent, uint32(Flags), uintptr(DeviceInfoSet), MachineName, 0)
+	return DevInfo(h), err
+}