diff --git a/src/cchardet/__init__.py b/src/cchardet/__init__.py
index 3659a4a..5853777 100644
--- a/src/cchardet/__init__.py
+++ b/src/cchardet/__init__.py
@@ -15,28 +15,4 @@ def detect(msg):
     encoding, confidence = _cchardet.detect_with_confidence(msg)
     if isinstance(encoding, bytes):
         encoding = encoding.decode()
-    return {"encoding": encoding, "confidence": confidence}
-
-
-class Detector(object):
-    """Wrap csd_consider with 'feed' feature."""
-
-    def __init__(self):
-        self._detector = _cchardet.Detector()
-
-    def feed(self, data):
-        self._detector.feed(data)
-
-    def close(self):
-        self._detector.close()
-
-    @property
-    def done(self):
-        return self._detector.done
-
-    @property
-    def result(self):
-        encoding, confidence = self._detector.result
-        if isinstance(encoding, bytes):
-            encoding = encoding.decode()
-        return {"encoding": encoding, "confidence": confidence}
+    return { "encoding": encoding, "confidence": confidence }
diff --git a/src/cchardet/_cchardet.pyx b/src/cchardet/_cchardet.pyx
index f03f1f9..fe6531e 100644
--- a/src/cchardet/_cchardet.pyx
+++ b/src/cchardet/_cchardet.pyx
@@ -1,81 +1,33 @@
 cdef extern from *:
     ctypedef char* const_char_ptr "const char*"
 
-cdef extern from "charsetdetect.h":
-    ctypedef void* csd_t
-    cdef csd_t csd_open()
-    cdef int csd_consider(csd_t csd, char* data, int length)
-    cdef const_char_ptr csd_close2(csd_t csd, float *confidence)
+cdef extern from "uchardet.h":
+    ctypedef void* uchardet_t
+    cdef uchardet_t uchardet_new()
+    cdef void uchardet_delete(uchardet_t ud)
+    cdef int uchardet_handle_data(uchardet_t ud, const_char_ptr data, int length)
+    cdef void uchardet_data_end(uchardet_t ud)
+    cdef void uchardet_reset(uchardet_t ud)
+    cdef const_char_ptr uchardet_get_charset(uchardet_t ud)
+    cdef float uchardet_get_confidence(uchardet_t ud)
 
-def detect_with_confidence(char *msg):
-    cdef csd_t csd = csd_open()
-
-    # すでにカウント済みの長さへアクセス
-    # strlenでは再度カウントすることになる
-    # https://github.com/python/cpython/blob/c30098c8c6014f3340a369a31df9c74bdbacc269/Include/bytesobject.h#L82
-    # https://github.com/python/cpython/blob/c30098c8c6014f3340a369a31df9c74bdbacc269/Objects/bytesobject.c#L2490
-    # https://github.com/python/cpython/blob/c30098c8c6014f3340a369a31df9c74bdbacc269/Include/object.h#L346
-    # https://github.com/python/cpython/blob/c30098c8c6014f3340a369a31df9c74bdbacc269/Objects/bytesobject.c#L2410
+def detect_with_confidence(const_char_ptr msg):
     cdef int length = len(msg)
+    
+    cdef uchardet_t ud = uchardet_new()
 
-    cdef int result = csd_consider(csd, msg, length)
-    cdef float confidence = 0.0
-    cdef const_char_ptr detected_charset
+    cdef int result = uchardet_handle_data(ud, msg, length)
+    if result != 0:
+        uchardet_delete(ud)
+        raise Exception("Handle data error")
 
-    if result == 1: # Need more data
-        detected_charset = csd_close2(csd, &confidence)
-    elif result == 0: # Detected early
-        detected_charset = csd_close2(csd, &confidence)
-    else: # Error, signal with a negative number
-        raise Exception("Error, signal with a negative number")
+    uchardet_data_end(ud)
+
+    cdef bytes detected_charset = uchardet_get_charset(ud)
+    cdef float detected_confidence = uchardet_get_confidence(ud)
+    uchardet_delete(ud)
 
     if detected_charset:
-        return detected_charset, confidence
+        return detected_charset, detected_confidence
+
     return None, None
-
-cdef class Detector:
-    cdef csd_t csd
-    cdef int _done
-    cdef int _closed
-    cdef float _confidence
-    cdef const_char_ptr _detected_charset
-
-    def __init__(self):
-        self.csd = csd_open()
-        self._done = 0
-        self._closed = 0
-        self._confidence = 0.0
-        self._detected_charset = ''
-
-    def feed(self, char *msg):
-        cdef int length
-        cdef int result
-
-        if not self.done and not self._closed:
-            length = len(msg)
-            result = csd_consider(self.csd, msg, length)
-
-            if result == -1: # Error, signal with a negative number
-                raise Exception("Error, signal with a negative number")
-
-            elif result == 1: # Need more data
-                pass
-
-            elif result == 0: # Detected early
-                self._done = 1
-                self.close()
-
-    def close(self):
-        if not self._closed:
-            self._detected_charset = csd_close2(self.csd, &self._confidence)
-            self._closed = 1
-
-    @property
-    def done(self):
-        return bool(self._done)
-
-    @property
-    def result(self):
-        if len(self._detected_charset):
-            return self._detected_charset, self._confidence
-        return None, None