adjust analyze image to throw barcode exceptions if needed

@@ -29,7 +29,7 @@ class MobileScannerHandler(
 
     private val analyzeImageErrorCallback: AnalyzerErrorCallback = {
         Handler(Looper.getMainLooper()).post {
-            analyzerResult?.error(MobileScannerErrorCodes.GENERIC_ERROR, it, null)
+            analyzerResult?.error(MobileScannerErrorCodes.BARCODE_ERROR, it, null)
             analyzerResult = null
         }
     }

@@ -269,7 +269,7 @@ public class MobileScannerPlugin: NSObject, FlutterPlugin {
                                    barcodeScannerOptions: scannerOptions, callback: { barcodes, error in
             if error != nil {
                 DispatchQueue.main.async {
-                    result(FlutterError(code: MobileScannerErrorCodes.GENERIC_ERROR,
+                    result(FlutterError(code: MobileScannerErrorCodes.BARCODE_ERROR,
                                         message: error?.localizedDescription,
                                         details: nil))
                 }

@@ -164,21 +164,30 @@ class MethodChannelMobileScanner extends MobileScannerPlatform {
     String path, {
     List<BarcodeFormat> formats = const <BarcodeFormat>[],
   }) async {
-    final Map<Object?, Object?>? result =
-        await methodChannel.invokeMapMethod<Object?, Object?>(
-      'analyzeImage',
-      {
-        'filePath': path,
-        'formats': formats.isEmpty
-            ? null
-            : [
-                for (final BarcodeFormat format in formats)
-                  if (format != BarcodeFormat.unknown) format.rawValue,
-              ],
-      },
-    );
+    try {
+      final Map<Object?, Object?>? result =
+          await methodChannel.invokeMapMethod<Object?, Object?>(
+        'analyzeImage',
+        {
+          'filePath': path,
+          'formats': formats.isEmpty
+              ? null
+              : [
+                  for (final BarcodeFormat format in formats)
+                    if (format != BarcodeFormat.unknown) format.rawValue,
+                ],
+        },
+      );
 
-    return _parseBarcode(result);
+      return _parseBarcode(result);
+    } on PlatformException catch (error) {
+      // Handle any errors from analyze image requests.
+      if (error.code == kBarcodeErrorEventName) {
+        throw MobileScannerBarcodeException(error.message);
+      }
+
+      return null;
+    }
   }
 
   @override

@@ -191,6 +191,9 @@ class MobileScannerController extends ValueNotifier<MobileScannerState> {
   /// This is only supported on Android, iOS and MacOS.
   ///
   /// Returns the [BarcodeCapture] that was found in the image.
+  ///
+  /// If an error occurred during the analysis of the image,
+  /// a [MobileScannerBarcodeException] error is thrown.
   Future<BarcodeCapture?> analyzeImage(String path) {
     return MobileScannerPlatform.instance.analyzeImage(path);
   }