Handle netmask of 0 (close #41)

tehmaze · Jul 14, 2015 · 7b28c8a · 7b28c8a
1 parent 4fe05f5
commit 7b28c8a
Showing 1 changed file with 7 additions and 4 deletions.
diff --git a/ipcalc.py b/ipcalc.py
@@ -161,10 +161,13 @@ def __init__(self, ip, mask=None, version=0):
         elif isinstance(self.mask, basestring):
             limit = [32, 128][':' in self.mask]
             inverted = ~self._dqtoi(self.mask)
-            count = 0
-            while inverted & pow(2, count):
-                count += 1
-            self.mask = (limit - count)
+            if inverted == -1:
+                self.mask = 0
+            else:
+                count = 0
+                while inverted & pow(2, count):
+                    count += 1
+                self.mask = (limit - count)
         else:
             raise ValueError('Invalid netmask')
         # Validate subnet size