621,645d620
<     def seekable(self):
<         return True
<         
<     def seek(self, offset, whence=0):
<         if whence:
<             if whence == 1:
<                 offset = self._offset + offset
<             else:
<                 raise ValueError('Seek from end not supported')
< 
< 
<         if offset < self._offset:
<             # for negative seek, rewind and do positive seek
<             self._fileobj.seek(0)
<             self._unconsumed = ''
<             self._readbuffer = ''
<             self._offset = 0
<             self._running_crc = crc32(b'') & 0xffffffff
<             
<         count = offset - self._offset
<         for i in xrange(count // 1024):
<             self.read(1024)
<         self.read(count % 1024)
< 
<         return self._offset