Entry#unpack_local_entry can't get compressed_size

[blackerhand]

First, I get a zip file use mac osx, (select 2 file, right-click, select compress).

Second, I use Zip::File open it, It's right. but Zip::InputStream is error(only get one entry).

Zip::File.open('2.zip') do |zip_file|
  zip_file.each do |entry|
    puts "Extracting #{entry.name}" 
    entry.compressed_size #  > 0 
  end
end

input = Zip::InputStream.open(::StringIO.new(io), 0, decrypter)
while entry = input.get_next_entry

entry.compressed_size  # = 0  
# I can't get the second file, because offset not right

Because the zip file has a password, I must use Zip::InputStream

ruby 2.6.6p146
rubyzip (2.3.2)

[blackerhand]

def get_next_entry
  @archive_io.seek(@current_entry.next_header_offset, IO::SEEK_SET) if @current_entry
  open_entry
end

def unpack_local_entry(buf)
      @header_signature,
        @version,
        @fstype,
        @gp_flags,
        @compression_method,
        @last_mod_time,
        @last_mod_date,
        @crc,
        @compressed_size, # 0
        @size,
        @name_length,
        @extra_length = buf.unpack('VCCvvvvVVVvv')
end 

https://users.cs.jmu.edu/buchhofp/forensics/formats/pkzip.html

[blackerhand]

Checkout rubyzip 3.0.0, I get error:

Zip::GPFBit3Error:
It is not possible to get complete info from the local header to extract this entry (GP flags bit 3 is set). Please use Zip::File instead of Zip::InputStream.

But Zip::File not supprot decrypter, It can be a constant cycle.

[blackerhand]

@hainesr

[hainesr]

This is partly an issue with zip archives created by Archive on OSX - there's a bit of an explanation here: #510 (comment)

We do need to enable reading/writing encrypted zips via Zip::File, which is noted as an issue here: #519