filetables.py 文件源码

def _read_extras(self):
        dbfile = self.dbfile

        # Read the extras
        HashReader._read_extras(self)

        # Set up for reading the index array
        indextype = self.extras["indextype"]
        self.indexbase = dbfile.tell()
        self.indexlen = self.extras["indexlen"]
        self.indexsize = struct.calcsize(indextype)
        # Set up the function to read values from the index array
        if indextype == "B":
            self._get_pos = dbfile.get_byte
        elif indextype == "H":
            self._get_pos = dbfile.get_ushort
        elif indextype == "i":
            self._get_pos = dbfile.get_int
        elif indextype == "I":
            self._get_pos = dbfile.get_uint
        elif indextype == "q":
            self._get_pos = dbfile.get_long
        else:
            raise Exception("Unknown index type %r" % indextype)