Unzip files packed in systems non-standard encoding (shiftjis in particular)

unzip-decode.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import argparse
import datetime
import os
import shutil
import time
import zipfile

if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument('fn', type=str, help='filename')
    parser.add_argument('--path', type=str, help='target path')
    parser.add_argument('--encoding', type=str, default='shift-jis', help='names encoding')
    args = parser.parse_args()

    zfile = zipfile.ZipFile(args.fn)
    path = os.fspath(args.path) if args.path else os.getcwd()
    for member in zfile.infolist():
        arcname = member.filename
        arcname = arcname.encode('cp437').decode(args.encoding)
        arcname = arcname.replace('/', os.path.sep)
        if os.path.altsep:
            arcname = arcname.replace(os.path.altsep, os.path.sep)

        arcname = os.path.splitdrive(arcname)[1]
        invalid_path_parts = ('', os.path.curdir, os.path.pardir)
        arcname = os.path.sep.join(x for x in arcname.split(os.path.sep)
                                   if x not in invalid_path_parts)
        targetpath = os.path.join(path, arcname)
        targetpath = os.path.normpath(targetpath)

        # Create all upper directories if necessary.
        upperdirs = os.path.dirname(targetpath)
        if upperdirs and not os.path.exists(upperdirs):
            os.makedirs(upperdirs)

        if member.is_dir():
            if not os.path.isdir(targetpath):
                os.mkdir(targetpath)
        else:
            with zfile.open(member) as source, \
                 open(targetpath, "wb") as target:
                shutil.copyfileobj(source, target)

        mtime = time.mktime(datetime.datetime(*member.date_time).timetuple())
        os.utime(targetpath, (mtime, mtime))