replace class/subclass with Class type

usb/config.go

@@ -56,8 +56,8 @@ func (i InterfaceInfo) String() string {
 type InterfaceSetup struct {
 	Number     uint8
 	Alternate  uint8
-	IfClass    uint8
-	IfSubClass uint8
+	IfClass    Class
+	IfSubClass Class
 	IfProtocol uint8
 	Endpoints  []EndpointInfo
 }

usb/constants.go

@@ -17,6 +17,7 @@ package usb
 
 // #include <libusb.h>
 import "C"
+import "strconv"
 
 type Class uint8
 
@@ -51,7 +52,10 @@ var classDescription = map[Class]string{
 }
 
 func (c Class) String() string {
-	return classDescription[c]
+	if d, ok := classDescription[c]; ok {
+		return d
+	}
+	return strconv.Itoa(int(c))
 }
 
 type DescriptorType uint8

usb/endpoint_info_test.go

@@ -27,7 +27,7 @@ var testBulkInEP = EndpointInfo{
 var testBulkInSetup = InterfaceSetup{
 	Number:    0,
 	Alternate: 0,
-	IfClass:   uint8(ClassVendorSpec),
+	IfClass:   ClassVendorSpec,
 	Endpoints: []EndpointInfo{testBulkInEP},
 }
 
@@ -43,6 +43,6 @@ var testIsoOutEP = EndpointInfo{
 var testIsoOutSetup = InterfaceSetup{
 	Number:    0,
 	Alternate: 0,
-	IfClass:   uint8(ClassVendorSpec),
+	IfClass:   ClassVendorSpec,
 	Endpoints: []EndpointInfo{testIsoOutEP},
 }

usb/fakelibusb_test.go

@@ -43,7 +43,7 @@ var (
 					Setups: []InterfaceSetup{{
 						Number:    0,
 						Alternate: 0,
-						IfClass:   uint8(ClassVendorSpec),
+						IfClass:   ClassVendorSpec,
 						Endpoints: []EndpointInfo{{
 							Number:        1,
 							Direction:     EndpointDirectionOut,
@@ -79,14 +79,14 @@ var (
 					Setups: []InterfaceSetup{{
 						Number:    0,
 						Alternate: 0,
-						IfClass:   uint8(ClassVendorSpec),
+						IfClass:   ClassVendorSpec,
 					}},
 				}, {
 					Number: 1,
 					Setups: []InterfaceSetup{{
 						Number:    1,
 						Alternate: 0,
-						IfClass:   uint8(ClassVendorSpec),
+						IfClass:   ClassVendorSpec,
 						Endpoints: []EndpointInfo{{
 							Number:        5,
 							Direction:     EndpointDirectionOut,
@@ -103,7 +103,7 @@ var (
 					}, {
 						Number:    1,
 						Alternate: 1,
-						IfClass:   uint8(ClassVendorSpec),
+						IfClass:   ClassVendorSpec,
 						Endpoints: []EndpointInfo{{
 							Number:        5,
 							Direction:     EndpointDirectionOut,
@@ -118,7 +118,7 @@ var (
 					}, {
 						Number:    1,
 						Alternate: 2,
-						IfClass:   uint8(ClassVendorSpec),
+						IfClass:   ClassVendorSpec,
 						Endpoints: []EndpointInfo{{
 							Number:        5,
 							Direction:     EndpointDirectionIn,

usb/libusb.go

@@ -241,8 +241,8 @@ func (libusbImpl) getDeviceDesc(d *libusbDevice) (*Descriptor, error) {
 				i := InterfaceSetup{
 					Number:     uint8(alt.bInterfaceNumber),
 					Alternate:  uint8(alt.bAlternateSetting),
-					IfClass:    uint8(alt.bInterfaceClass),
-					IfSubClass: uint8(alt.bInterfaceSubClass),
+					IfClass:    Class(alt.bInterfaceClass),
+					IfSubClass: Class(alt.bInterfaceSubClass),
 					IfProtocol: uint8(alt.bInterfaceProtocol),
 				}
 				var ends []C.struct_libusb_endpoint_descriptor