unarchive.py 文件源码

def _crc32(self, path):
        if self._infodict:
            return self._infodict[path]

        try:
            archive = ZipFile(self.src)
        except BadZipfile:
            e = get_exception()
            if e.args[0].lower().startswith('bad magic number'):
                # Python2.4 can't handle zipfiles with > 64K files.  Try using
                # /usr/bin/unzip instead
                self._legacy_file_list()
            else:
                raise
        else:
            try:
                for item in archive.infolist():
                    self._infodict[item.filename] = long(item.CRC)
            except:
                archive.close()
                raise UnarchiveError('Unable to list files in the archive')

        return self._infodict[path]