drop corrupted db (PR by @turekj: Baseflow#407)

Author: contactjavas

flutter_cache_manager/lib/src/storage/cache_info_repositories/cache_object_provider.dart

@@ -25,8 +25,12 @@ class CacheObjectProvider extends CacheInfoRepository
     if (!shouldOpenOnNewConnection()) {
       return openCompleter!.future;
     }
+
     final path = await _getPath();
+
     await File(path).parent.create(recursive: true);
+    await _dropCorruptedDb(path);
+
     db = await openDatabase(path, version: 3,
         onCreate: (Database db, int version) async {
       await db.execute('''
@@ -214,4 +218,41 @@ class CacheObjectProvider extends CacheInfoRepository
       }
     }
   }
+
+  static Future<void> _dropCorruptedDb(String path) async {
+    bool exists = false;
+
+    try {
+      exists = await File(path).exists();
+    } on FileSystemException {
+      // We can not read the file, so we assume it does not exist.
+    } catch (e) {
+      // We can not read the file, so we assume it does not exist.
+    }
+
+    if (!exists) {
+      return;
+    }
+
+    Database? pragmaDb;
+    bool isIntegral = true;
+
+    try {
+      pragmaDb = await openDatabase(path);
+      final check = await pragmaDb.rawQuery("pragma integrity_check");
+      isIntegral = check.length == 1 && check[0].values.first == "ok";
+    } on DatabaseException {
+      isIntegral = false;
+    } catch (e) {
+      isIntegral = false;
+    } finally {
+      if (pragmaDb != null) {
+        await pragmaDb.close();
+      }
+    }
+
+    if (!isIntegral) {
+      await deleteDatabase(path);
+    }
+  }
 }