fp-device: add new type FpDeviceError FP_DEVICE_ERROR_DATA_DUPLICATE

Author: boger.wang

libfprint/fp-device.h

@@ -90,6 +90,7 @@ typedef enum {
  * @FP_DEVICE_ERROR_DATA_INVALID: The passed data is invalid
  * @FP_DEVICE_ERROR_DATA_NOT_FOUND: Requested print was not found on device
  * @FP_DEVICE_ERROR_DATA_FULL: No space on device available for operation
+ * @FP_DEVICE_ERROR_DATA_DUPLICATE: Enrolling template duplicates storaged templates
  *
  * Error codes for device operations. More specific errors from other domains
  * such as #G_IO_ERROR or #G_USB_DEVICE_ERROR may also be reported.
@@ -104,6 +105,7 @@ typedef enum {
   FP_DEVICE_ERROR_DATA_INVALID,
   FP_DEVICE_ERROR_DATA_NOT_FOUND,
   FP_DEVICE_ERROR_DATA_FULL,
+  FP_DEVICE_ERROR_DATA_DUPLICATE,
 } FpDeviceError;
 
 GQuark fp_device_retry_quark (void);

libfprint/fpi-device.c

@@ -135,6 +135,10 @@ fpi_device_error_new (FpDeviceError error)
       msg = "Print was not found on the devices storage.";
       break;
 
+    case FP_DEVICE_ERROR_DATA_DUPLICATE:
+      msg = "This finger has already enrolled, please try a different finger";
+      break;
+
     default:
       g_warning ("Unsupported error, returning general error instead!");
       error = FP_DEVICE_ERROR_GENERAL;