Add Device.Manufacturer(), .Product() and .SerialNumber() (#14)

fakelibusb_test.go

@@ -21,11 +21,6 @@ import (
 	"time"
 )
 
-type fakeDevice struct {
-	desc *DeviceDesc
-	alt  uint8
-}
-
 type fakeTransfer struct {
 	// done is the channel that needs to be closed when the transfer has finished.
 	done chan struct{}
@@ -75,7 +70,7 @@ func (f *fakeLibusb) setDebug(*libusbContext, int) {}
 func (f *fakeLibusb) dereference(d *libusbDevice) {}
 func (f *fakeLibusb) getDeviceDesc(d *libusbDevice) (*DeviceDesc, error) {
 	if dev, ok := f.fakeDevices[d]; ok {
-		return dev.desc, nil
+		return dev.devDesc, nil
 	}
 	return nil, fmt.Errorf("invalid USB device %p", d)
 }
@@ -109,8 +104,16 @@ func (f *fakeLibusb) setConfig(d *libusbDevHandle, cfg uint8) error {
 	}
 	return nil
 }
-func (f *fakeLibusb) getStringDesc(*libusbDevHandle, int) (string, error) {
-	return "", errors.New("not implemented")
+func (f *fakeLibusb) getStringDesc(d *libusbDevHandle, index int) (string, error) {
+	dev, ok := f.fakeDevices[f.handles[d]]
+	if !ok {
+		return "", fmt.Errorf("invalid USB device %p", d)
+	}
+	str, ok := dev.strDesc[index]
+	if !ok {
+		return "", fmt.Errorf("invalid string descriptor index %d", index)
+	}
+	return str, nil
 }
 func (f *fakeLibusb) setAutoDetach(*libusbDevHandle, int) error { return nil }
 
@@ -202,10 +205,9 @@ func newFakeLibusb() (*fakeLibusb, func() error) {
 		// without using the full USB stack. Since the fake library uses the
 		// libusbDevice only as an identifier, use an arbitrary unique pointer.
 		// The contents of these pointers is never accessed.
-		fl.fakeDevices[newDevicePointer()] = &fakeDevice{
-			desc: d,
-			alt:  0,
-		}
+		fd := new(fakeDevice)
+		*fd = d
+		fl.fakeDevices[newDevicePointer()] = fd
 	}
 	libusb = fl
 	return fl, func() error {