ZipConstants.DefaultCodePage is set as UTF-8, but the default for FileEntry.IsUnicodeText is still false

[tabhuang]

Zip chinese filename, but I get filename with garbled text.
#NET45
#C Sharp
#v1.0.0 RC1
#ZipEntry
https://github.com/icsharpcode/SharpZipLib/releases

Test Chinese Filename
測試.txt

Zip Filename like "測試.txt", but I get filename "皜祈岫.txt".

Version 0.86.0.518 is OK, but 1.0.0 is wrong.

[piksel]

Could you provide a sample file that does not work? You can upload it here by dragging it into the textbox.

[cerasumat]

I got the same problem, my file directory contains chinese like '/mnt/img/汉字/1.png', the file in the zip file turned to '/mnt/img/xxx(messy code)/1.png'.
enviroment: centOS 7.1, .net core 2.1

[piksel]

Hm, I made a simple program to test this (https://gist.github.com/piksel/e4132290380d1744165e878a40d9c44f)

And it seems fine on .NET Core 2.1 on linux:

$ dotnet run
Downloading test file...
Zipping test dir...
Listing zip entries:
  Entry: 測試.txt

The file name is correct when opened in 7zip and windows explorer:

Extracting it with unzip v6.0 on linux does not give the correct file name though:

$ unzip -l -v test.zip
Archive:  test.zip
 Length   Method    Size  Cmpr    Date    Time   CRC-32   Name
--------  ------  ------- ---- ---------- ----- --------  ----
     306  Defl:N      249  19% 2018-07-18 17:54 19dbc344  ц╕мшйж.txt
--------          -------  ---                            -------
     306              249  19%                            1 file

Generated file: test.zip

[piksel]

Update to @cerasumat:
Works if the correct encoding is specified:

$ unzip -l -v -O UTF-8 test.zip
Archive:  test.zip
 Length   Method    Size  Cmpr    Date    Time   CRC-32   Name
--------  ------  ------- ---- ---------- ----- --------  ----
     306  Defl:N      249  19% 2018-07-18 17:54 19dbc344  測試.txt
--------          -------  ---                            -------
     306              249  19%                            1 file

[shikelong]

How to fix it?

[tabhuang]

It's work for me.

Step1.
I try to edit the file [SharpZipLib-master\src\ICSharpCode.SharpZipLib\Zip\ZipConstants.cs]
ZipConstants.txt

Step2.
In my program, before use zip, insert code like this:
Encoding big5 = Encoding.GetEncoding("Big5");
ZipConstants.DefaultCodePage = big5.CodePage;

Result:

[piksel]

@tabhuang Yes, you can just use

ZipConstants.DefaultCodePage = Encoding.GetEncoding("Big5").CodePage;

To use a custom code page for the file names.

To use Unicode you have to set the ZipEntry.IsUnicodeText to true.
If you are using FastZip you can just set it on the EntryFactory:

fastZip.EntryFactory = new ZipEntryFactory
{
    IsUnicodeText = true
};

[piksel]

Turns out, this is a bug after all.

The default settings for file name encoding yields the wrong output.