88c20d965de6342244ba942f8a355ebfb2f8133c,PyInstaller/archive/readers.py,CArchiveReader,checkmagic,#CArchiveReader#,132

Before Change

            self.lib.seek(filelen-self._cookie_size, 0)
            (magic, totallen, tocpos, toclen, pyvers, pylib_name) = struct.unpack(
                self._cookie_format, self.lib.read(self._cookie_size))
            if magic != self.MAGIC:
                filelen -= 1
            else:
                found = True
                break
                
                
        if not found:
            raise RuntimeError("%s is not a valid %s archive file" %
                               (self.path, self.__class__.__name__))

After Change

        
        self.lib.seek(max(0, filelen-4096)) 
        searchpos = self.lib.tell()
        buf = self.lib.read(min(filelen, 4096))
        pos = buf.rfind(self.MAGIC)
        if pos == -1:
            raise RuntimeError("%s is not a valid %s archive file" %
                               (self.path, self.__class__.__name__))
        filelen = searchpos + pos + self._cookie_size

Instances