fix an issue where UTF-8 with a BOM would not be detected as UTF-8-SIG ( fix #28 )

src/ext/uchardet

@@ -1 +1 @@
-Subproject commit 795e982965404568e3a8354e69b08e71137ee6ff
+Subproject commit a2d24a50fa23d71f543501168bfe9b3a859c83cd

src/tests/test.py

@@ -102,3 +102,15 @@ class TestCChardet():
                 except LookupError as e:
                     print("LookupError: { file=%s, encoding=%s }" % (testfile, detected_encoding["encoding"]))
                     raise e
+
+    def test_utf8_with_bom(self):
+        sample = b'\xEF\xBB\xBF'
+        detected_encoding = cchardet.detect(sample)
+        eq_(
+            "utf-8-sig",
+            detected_encoding['encoding'].lower(),
+            'Expected %s, but got %s' % (
+                "utf-8-sig",
+                detected_encoding['encoding'].lower()
+            )
+        )