438         self._initempty = True

   438         self._initempty = True

   439         try:

   439         try:

   440             with self._indexfp() as f:

   440             with self._indexfp() as f:

   441                 if (mmapindexthreshold is not None and

   441                 if (mmapindexthreshold is not None and

   442                     self.opener.fstat(f).st_size >= mmapindexthreshold):

   442                     self.opener.fstat(f).st_size >= mmapindexthreshold):

   443                     indexdata = util.buffer(util.mmapread(f))

   445                     indexdata = util.buffer(util.mmapread(f))

   444                 else:

   446                 else:

   445                     indexdata = f.read()

   447                     indexdata = f.read()

   446             if len(indexdata) > 0:

   448             if len(indexdata) > 0:

   447                 versionflags = versionformat_unpack(indexdata[:4])[0]

   449                 versionflags = versionformat_unpack(indexdata[:4])[0]