UTF-8 中的 ArgumentError 无效字节序列

Question

What I want to solve

The following error occurs when downloading that file, compressed into a single zip file.

invalid byte sequence in UTF-8 .

For this error, I have to remove illegal characters as UTF-8 from the string, so I used encode method to convert from UTF-8 to UTF-8, but the string I want to display is not displayed. It looks like the image.

file_name.encode,("UTF-8", "UTF-8": invalid: :replace)

Is there any solution to this problem?

I would be glad to know.

source code

        Zip::File.open_buffer(obj) do |zip|

          zip.each do |entry|
            ext = File.extname(entry.name)
            file_name = File.basename(entry.name)

            # file_name.encode!("UTF-8", "UTF-8", invalid: :replace)

            next if ext.blank? || file_name.count(".") > 1

            dir = File.join(dir_name, File.dirname(entry.name))

            FileUtils.mkpath(dir.to_s)      

            zip.extract(entry, dir + ".txt" || ".jpg" || ".csv") {true}

            file_name.force_encoding("UTF-8")
            new_file_name = "#{dir_name}/#{file_name}"

            new_file_name.force_encoding("UTF-8")
            File.rename(dir + ".txt" || ".jpg" || ".csv", new_file_name)

            @input_dir << new_file_name
          end
        end
        
        Zip::OutputStream.open(zip_file.path) do |zip_data|
          @input_dir.each do |file|
          zip_data.put_next_entry(file)
          zip_data.write(File.read(file.to_s))
          end
        end

environment

mac OS Catarina 10.15.7 ruby "2.6.3"

Answer 1

You get these errors because the Zip gem assumes the filenames to be encoded in UTF-8 but they are actually in a different encoding.

To fix the error, you first have to find the correct encoding. Let's re-create the string from its bytes:

bytes = [111, 117, 116, 112, 117, 116, 50, 48, 50, 48, 49,
         50, 48, 55, 95, 49, 52, 49, 54, 48, 50, 47, 87,
         78, 83, 95, 85, 80, 151, 112, 131, 102, 129, 91,
         131, 94, 46, 116, 120, 116]

string = bytes.pack('c*')
#=> "output20201207_141602/WNS_UP\x97p\x83f\x81[\x83^.txt"

We can now traverse the Encoding.list and select those that return the expected result :

Encoding.list.select do |enc|
  s = string.encode('UTF-8', enc) rescue next
  s.end_with?('WNS_UP用データ.txt')
end
#=> [
#     #<Encoding:Windows-31J>,
#     #<Encoding:Shift_JIS>,
#     #<Encoding:SJIS-DoCoMo>,
#     #<Encoding:SJIS-KDDI>,
#     #<Encoding:SJIS-SoftBank>
#   ]

All of the above encodings result in the correct output.

Back to your code, you could use:

path = entry.name.encode('UTF-8', 'Windows-31J')
#=> "output20201207_141602/WNS_UP用データ.txt"

ext = File.extname(path)
#=> ".txt"

file_name = File.basename(path)
#=> "WNS_UP用データ.txt"

The Zip gem also has an option to set an explicit encoding for non-ASCII file names . You might want to give it a try by setting Zip.force_entry_names_encoding = 'Windows-31J' (haven't tried it)