ZipUnicode

Make extracted unreadable filename problem gone away.

Install:

Using pip: pip install ZipUnicode

Beside installing zip_unicode package, this will also create an executable file zipu in the syspath for you to work with zip file directly from the console.

Filename encoding inside a zip file

Everyone agrees what a zip file is and how to make one. That is the way to turn a collection of files into a sequence of bytes and put a .zip at the end of the name of a newly created file. But no one said anything about how filename should be handled. So it is up to the zip extracting program to interpret that sequence of bytes into filename.

Most OS use UTF-8 for filename encoding and flip a bit in the zip file to indicate that. However, Windows is not a case. For different languages, Windows uses different code pages to encode filename. So, if you create a zip file containing a file named ê.txt on Linux and extract it on Windows, you may got something like ├¬.txt or ﾃｪ.txt.

The exact filename depends on the code page or language that Windows is using. The same thing also happens when a zip file was created on Windows, contains non-ascii filename, and then extracted on Linux or on Windows that use different code pages.

All that means if the filename wasn't encoded by UTF-8 encoding (or code page), then there is no easy way to knows which encoding that was used when extracting the file.

Overview

You will use zipu to interact with zip file.

$ zipu -h

usage: zipu [-h] [--extract] [--fix] [--encoding ENCODING]
            [--password PASSWORD]
            zipfile [destination]

Fix filename encoding error inside a zip file.

positional arguments:
  zipfile               path to zip file
  destination           folder path to extract zip file

optional arguments:
  -h, --help            show this help message and exit
  --extract, -x         extract the zipfile to specified destination
  --fix, -f             create a new zip file with UTF-8 file names
  --encoding ENCODING, -enc ENCODING
                        zip file used encoding: shift-jis, cp932...
  --password PASSWORD, -pwd PASSWORD
                        password to extract zip file

Extracting a zip file is as simple as zipu -x file.zip. Files are extracted into the folder that has the same name as file.zip without .zip and stays on the same folder path as file.zip. Filename encoding is handled automatically.

You can also ensure your zip file being opened correctly on all computers by zipu -f file.zip. This will create a new file_fixed.zip contains all file names encoded with UTF-8.

Usage:

View content of the zip file:

You simply point zipu to your zip file's path as follow:

zipu path/to/file.zip

This makes zipu do the following:

automatically guess the encoding that was used to encode file names
check if the file was password encrypted
give you a default extract destination if you don't provide any

Then, it will show a summarization of the contents of that zip file, something similar to the following:

D:\tmp>zipu 20200524_ドラゴンフライト.zip

  * Detected encoding  :  SHIFT_JIS | Language:Japanese | Confidence:99%
  * Default destination:  D:\tmp
  * Password protected :  False
 --------------------------- try encoding: SHIFT_JIS ---------------------------
 20200524_ドラゴンフライト/
 20200524_ドラゴンフライト/テストレポート＿リナックスノード.txt
 20200524_ドラゴンフライト/太陽バッテリーver5.txt
 20200524_ドラゴンフライト/経営報告_桜ちゃん.txt
 -------------------------------------------------------------------------------
 Add '-enc ENCODING' to see filename shown in encoding ENCODING (mbcs, cp932, shift-jis,...)
 Add '-x' flag to extract all files to default destination

If there is a root folder inside and it has the same name as the zip file as above example, default destination will be the parent folder of the zip file. Otherwise, default destination will point to a subdirectory that has the name of the zip file as the following case:

D:\tmp>zipu 20200524_ドラゴンボール.zip

  * Detected encoding  :  SHIFT_JIS | Language:Japanese | Confidence:99%
  * Default destination:  D:\tmp\20200524_ドラゴンボール
  * Password protected :  False
 --------------------------- try encoding: SHIFT_JIS ---------------------------
 テストレポート＿リナックスノード.txt
 太陽バッテリーver5.txt
 経営報告_桜ちゃん.txt
 -------------------------------------------------------------------------------
 Add '-enc ENCODING' to see filename shown in encoding ENCODING (mbcs, cp932, shift-jis,...)
 Add '-x' flag to extract all files to default destination

View content with a specific encoding:

Encoding auto-detection is not always correct. When the sample is too little and some parts of A encoding are in B encoding, B may be wrongly detected instead of A. In such cases, you can specify the encoding which you believe is the correct one with -enc ENCODING switch.

D:\tmp>zipu 20200524_ドラゴンボール.zip -enc cp932

  * Default destination:  D:\tmp\20200524_ドラゴンボール
  * Password protected :  False
 --------------------------- try encoding: cp932 ---------------------------
 テストレポート＿リナックスノード.txt
 太陽バッテリーver5.txt
 経営報告_桜ちゃん.txt
 ---------------------------------------------------------------------------
 Add '-enc ENCODING' to see filename shown in encoding ENCODING (mbcs, cp932, shift-jis,...)
 Add '-x' flag to extract all files to default destination

In case that your specified ENCODING is wrong and cannot decode some bytes, these unknown bytes will be replaced by a lot of �.

D:\tmp>zipu 20200524_ドラゴンボール.zip -enc ascii

  * Default destination:  D:\tmp\20200524_ドラゴンボール
  * Password protected :  False
 --------------------------- try encoding: ascii ---------------------------
 �e�X�g���|�[�g�Q���i�b�N�X�m�[�h.txt
 ���z�o�b�e���[ver5.txt
 �o�c��_�������.txt
 ---------------------------------------------------------------------------
 Add '-enc ENCODING' to see filename shown in encoding ENCODING (mbcs, cp932, shift-jis,...)
 Add '-x' flag to extract all files to default destination

Or those bytes are mapped into completely different characters:

D:\tmp>zipu 20200524_ドラゴンボール.zip -enc utf16

  * Default destination:  D:\tmp\20200524_ドラゴンボール
  * Password protected :  False
 --------------------------- try encoding: utf16 ---------------------------
 斃境枃貃粃宁枃冁誃榃抃亃境涃宁梃琮瑸
 뺑窗澃抃斃誃宁敶㕲琮瑸
 澌掉邍赟苷芿苡⻱硴�
 ---------------------------------------------------------------------------
 Add '-enc ENCODING' to see filename shown in encoding ENCODING (mbcs, cp932, shift-jis,...)
 Add '-x' flag to extract all files to default destination

Only when auto-detection failed, it is your responsibility to decide which ENCODING is the correct one.

Warning: If your console uses non-full UTF-8 font as in the case of Windows, some UTF-8 characters are shown as a dot ・. This is not a result of wrong encoding but rather unsupported characters by the font.

Extract the zip file:

Usually, encoding auto-detection works just fine so you can jump right to extraction with
zipu -x path/to/file.zip. The -x argument can be either placed before or after the path to the zip file.
```
 D:\tmp>zipu 20200524_ドラゴンフライト.zip -x
```
```
 * Detected encoding  :  SHIFT_JIS | Language:Japanese | Confidence:99%
Extracting: 20200524_ドラゴンフライト/テストレポート＿リナックスノード.txt
Extracting: 20200524_ドラゴンフライト/太陽バッテリーver5.txt
Extracting: 20200524_ドラゴンフライト/経営報告_桜ちゃん.txt
Finished
```
As mentioned before, without specifying the destination, zip file is extracted to the directory in the same path and has the name of that zip file.
In the above example, that would be D:\tmp\20200524_ドラゴンフライト.

When extract destination is specified, you add it right after the zip file's path as:
```
zipu -x path/to/file.zip path/to/extract 
```
If the output file names are unreadable, you have to guess the ENCODING with -enc switch as described in 2. View content with a specified encoding. Then you can use that ENCODING to extract zip file:
```
zipu path/to/file.zip -x -enc ENCODING
```
A Password protected zip file:

If a zip file is encrypted, * Password protected : True will show up when viewing its content. When extracting the zip file, you will be asked for password if you haven't provided any. You can also specify password directly in the command as follows:
```
 zipu path/to/file.zip -x -pwd PASSWORD  
```

Mixed contents:

Some zip files are very tricky. It contains file names of different encodings. Some UTF-8, some not. For UTF-8 marked files, zipu will leave it as is while trying different ENCODING on other files. UTF-8 encoded filename has (UTF-8) string prefixed in the content view:

D:\tmp>zipu ミックス.zip

 * Detected encoding  :  SHIFT_JIS | Language:Japanese | Confidence:63%
 * Default destination:  D:\tmp\ミックス
 * Password protected :  False
--------------------------- try encoding: SHIFT_JIS ---------------------------
(UTF-8) Vùng Trời Bình Yên.txt
бореиская.txt
テストレポート＿リナックスノード.txt
太陽バッテリーver5.txt
経営報告_桜ちゃん.txt
-------------------------------------------------------------------------------
Add '-enc ENCODING' to see filename shown in encoding ENCODING (mbcs, cp932, shift-jis,...)
Add '-x' flag to extract all files to default destination

When extracting, UTF-8 encoded filename will not wrongly be decoded with detected ENCODING so that you can read it as is.

Warning: zipu cannot handle zip file that contains three or more encodings, or two encodings but neither is UTF-8. In such cases, you have to extract the zip file for each encoding.

Fixing a zip file:

If you make a zip file contains file names which are not in UTF-8 nor ASCII encoding, then you can ensure that your colleagues who use computers of different language can open the zip just fine as follows:
```
zipu -f path/to/file.zip
```
This first extracts your zip file (and convert all file names to UTF-8). Then it compresses extracted contents and adds _fixed suffix to the zip filename. The fixed zip file is on the same path as the original one.

Warning: zipu cannot create password encrypted zip file. With these files you have to first extract it by zipu and then re-zip it with your conventional tool.

Changelog

1.1.0

Handle malformed zip file: Some zip files contain folders but are registered as file entries. These file entries have size of zero by and are extracted as zero-byte files. Since the OS doesn't allow creating file and folder of the same name within the same directory, zipu cannot continue to create the folder and extract the file inside. Now zipu will check for those malformed entries and skip it.
Fixing zip file from commandline with zipu -f now work normally.