--- /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/zipfile.py	2014-11-11 03:00:25.000000000 +0000
+++ zipfile.py	2014-11-11 03:05:01.000000000 +0000
@@ -515,6 +515,7 @@
     def __init__(self, fileobj, mode, zipinfo, decrypter=None,
             close_fileobj=False):
         self._fileobj = fileobj
+        self._tell = fileobj.tell()
         self._decrypter = decrypter
         self._close_fileobj = close_fileobj
 
@@ -658,7 +659,9 @@
             nbytes = max(nbytes, self.MIN_READ_SIZE)
             nbytes = min(nbytes, self._compress_left)
 
+            self._fileobj.seek(self._tell)
             data = self._fileobj.read(nbytes)
+            self._tell += len(data)
             self._compress_left -= len(data)
 
             if data and self._decrypter is not None: