Add header readout for offline files. Closes #13

read file "Head" and display a Userwarning for unsupported "Header". closes issue #13 (closed)

km3io/offline.py

@@ -333,9 +333,10 @@ class OfflineReader:
         if self._header is None:
             fobj = uproot.open(self._file_path)
             if b'Head;1' in fobj.keys():
+                self._header = {}
                 for n, x in fobj['Head']._map_3c_string_2c_string_3e_.items():
-                    print("{:15s} {}".format(n.decode("utf-8"), x))
-                    self._header = fobj['Head']._map_3c_string_2c_string_3e_
+                    print("{:15s} {}".format(n.decode("utf-8"), x.decode("utf-8")))
+                    self._header[n.decode("utf-8")] = x.decode("utf-8")
             if b'Header;1' in fobj.keys():
                 warnings.warn("Your file header has an unsupported format")
         return self._header