example on generating an epub-zip file with ruby and rubyzip

ruby_epub_example.rb

entries = Hash.new
# fill the entries with files like this
# entries['OEBPS/chapter1.xhtml'] = "complete_file_path_on_the filesystem"

FileUtils.remove(zip_path) if File.exists?(zip_path) # deleting the old zip file

# creating the output zip stream
zip = Zip::ZipOutputStream.new(zip_path)

# this is the real sucker of epub, the MUST contain a file called
# mimetype and it's first entry in the zip AND WITHOUT compression with the specified mimetype below
zip.put_next_entry('mimetype', nil, nil, Zip::ZipEntry::STORED, Zlib::NO_COMPRESSION)
zip.write "application/epub+zip"

entries.keys.each do |key|
  # now let's add all the stuff to the epub file
  zip.put_next_entry key, nil, nil, Zip::ZipEntry::DEFLATED, Zlib::BEST_COMPRESSION
  zip.write IO.read(entries[key])
end
zip.close # we're finished

  			puts "EPub.zip: wrote #{self.zip_output_path}"

this gist is based on the work of https://github.com/avdgaag/rpub/blob/master/lib/rpub/compressor.rb