Extract zip file with filename encoding conversion

unzip.rb

#!/usr/bin/env ruby

require 'optparse'
require 'zip'
require 'fileutils'

# parse command line arguments
options = {}
OptionParser.new do |opt|
    opt.on('-f FROM_ENC') {|o| options[:from_enc] = o}
    opt.on('-t TO_ENC') {|o| options[:to_enc] = o}
end.parse!
options[:zipfile] = ARGV.pop
raise OptionParser::MissingArgument if options[:from_enc].nil?
raise OptionParser::MissingArgument if options[:to_enc].nil?
raise OptionParser::MissingArgument if options[:zipfile].nil?

from_enc = Encoding.find(options[:from_enc])
to_enc = Encoding.find(options[:to_enc])

Zip::File.open(options[:zipfile]) do |zipfile|
    zipfile.each do |entry|
        pathname = entry.name
        pathname.force_encoding(from_enc)
        pathname = pathname.encode!(to_enc)
        puts pathname
        dirname = File.dirname(pathname)
        FileUtils.mkdir_p(dirname) unless File.directory?(dirname)
        entry.extract(pathname)
    end
end

# vim:set ts=4 sw=4 et: