diff --git a/src/cchardet/_cchardet.pyx b/src/cchardet/_cchardet.pyx
index b1e3123..690d5f3 100644
--- a/src/cchardet/_cchardet.pyx
+++ b/src/cchardet/_cchardet.pyx
@@ -17,7 +17,7 @@ def detect_with_confidence(const_char_ptr msg):
     cdef uchardet_t ud = uchardet_new()
 
     cdef int result = uchardet_handle_data(ud, msg, length)
-    if result != 0:
+    if result == -1:
         uchardet_delete(ud)
         raise Exception("Handle data error")
 
@@ -65,15 +65,15 @@ cdef class UniversalDetector:
         if length > 0:
             result = uchardet_handle_data(self._ud, msg, length)
 
-            if result != 0:
+            if result == -1:
                 self._closed = 1
                 uchardet_delete(self._ud)
                 raise Exception("Handle data error")
-            else:
+            elif result == 0:
                 self._done = 1
-                uchardet_data_end(self._ud)
-                self._detected_charset = uchardet_get_charset(self._ud)
-                self._detected_confidence = uchardet_get_confidence(self._ud)
+
+            self._detected_charset = uchardet_get_charset(self._ud)
+            self._detected_confidence = uchardet_get_confidence(self._ud)
 
     def close(self):
         if not self._closed:
diff --git a/src/ext/uchardet b/src/ext/uchardet
index 4361f97..2cc0b9a 160000
--- a/src/ext/uchardet
+++ b/src/ext/uchardet
@@ -1 +1 @@
-Subproject commit 4361f97af2693e88bd0bc1de76e545b73112d0ce
+Subproject commit 2cc0b9aa38605960d98459e64033836cf8b4507a
diff --git a/src/tests/test.py b/src/tests/test.py
index f725127..ccb0ceb 100644
--- a/src/tests/test.py
+++ b/src/tests/test.py
@@ -47,33 +47,23 @@ class TestCChardet():
                     )
                 )
 
-    # def test_detector(self):
-    #     testfiles = glob.glob('tests/testdata/*/*.txt')
-    #     for testfile in testfiles:
-    #         if testfile.replace("\\", "/") in SKIP_LIST:
-    #             continue
-
-    #         base = os.path.basename(testfile)
-    #         expected_charset = os.path.splitext(base)[0]
-
-    #         detector = cchardet.UniversalDetector()
-    #         with open(testfile, 'rb') as f:
-    #             msg = f.read()
-    #             detector.feed(msg)
-    #             # line = f.readline()
-    #             # while line:
-    #             #     detector.feed(line)
-    #             #     if detector.done:
-    #             #         break
-    #             #     line = f.readline()
-    #         detector.close()
-    #         detected_encoding = detector.result
-    #         eq_(
-    #             expected_charset.lower(),
-    #             detected_encoding['encoding'].lower(),
-    #             'Expected %s, but got %s for "%s"' % (
-    #                 expected_charset.lower(),
-    #                 detected_encoding['encoding'].lower(),
-    #                 testfile
-    #             )
-    #         )
+    def test_detector(self):
+        detector = cchardet.UniversalDetector()
+        with open("tests/samples/wikipediaJa_One_Thousand_and_One_Nights_SJIS.txt", 'rb') as f:
+            print("===============================")
+            line = f.readline()
+            while line:
+                detector.feed(line)
+                if detector.done:
+                    break
+                line = f.readline()
+        detector.close()
+        detected_encoding = detector.result
+        eq_(
+            "shift_jis",
+            detected_encoding['encoding'].lower(),
+            'Expected %s, but got %s' % (
+                "shift_jis",
+                detected_encoding['encoding'].lower()
+            )
+        )