Unpacker for .pack files in World at Arms on iPhone

gistfile1.sh

% ruby unpack.rb
{"unknown_1"=>1, "files"=>10, "unknown_2"=>1}
[{"len"=>7, "name"=>"text_en", "addr_offset"=>168, "file_length"=>221984},
 {"len"=>7, "name"=>"text_fr", "addr_offset"=>222152, "file_length"=>241480},
 {"len"=>7, "name"=>"text_de", "addr_offset"=>463632, "file_length"=>238680},
 {"len"=>7, "name"=>"text_sp", "addr_offset"=>702312, "file_length"=>236167},
 {"len"=>7, "name"=>"text_it", "addr_offset"=>938479, "file_length"=>230940},
 {"len"=>7, "name"=>"text_br", "addr_offset"=>1169419, "file_length"=>236455},
 {"len"=>7, "name"=>"text_jp", "addr_offset"=>1405874, "file_length"=>261112},
 {"len"=>7, "name"=>"text_kr", "addr_offset"=>1666986, "file_length"=>246884},
 {"len"=>7, "name"=>"text_cn", "addr_offset"=>1913870, "file_length"=>222938},
 {"len"=>7, "name"=>"text_ru", "addr_offset"=>2136808, "file_length"=>319494}]

Start extraction....
Done! file = Data_Texts.pack/text_en, length = 221984
Done! file = Data_Texts.pack/text_fr, length = 241480
Done! file = Data_Texts.pack/text_de, length = 238680
Done! file = Data_Texts.pack/text_sp, length = 236167
Done! file = Data_Texts.pack/text_it, length = 230940
Done! file = Data_Texts.pack/text_br, length = 236455
Done! file = Data_Texts.pack/text_jp, length = 261112
Done! file = Data_Texts.pack/text_kr, length = 246884
Done! file = Data_Texts.pack/text_cn, length = 222938
Done! file = Data_Texts.pack/text_ru, length = 319494

..................................

unpack.rb

# requires ruby 1.9.3p0
# USAGE: ruby unpack.rb
# BEFORE RUN THIS COMMAND, YOU MUST PUT 'packs/*.pack'
# THEREFORE LS OUTPUT IS LIKE THIS:
# % ls
# unpack.rb packs/

require 'pp'
require 'fileutils'
require 'bindata'

class PackInfo < BinData::Record
  endian :little
  uint16 :unknown_1
  uint16 :files
  uint32 :unknown_2
end

class Record < BinData::Record
  endian :little
  uint8 :len
  string :name, :read_length => :len
  uint32 :addr_offset
  uint32 :file_length
end


Dir.glob("packs/*.pack").each do |pack_name|

  io = File.open(pack_name)

  # read .pack info
  pack_info = PackInfo.read(io)
  pp pack_info

  # read each records
  records = []
  pack_info[:files].times do
    records << Record.read(io)
  end

  # extract
  pp records

  puts "\nStart extraction...."
  records.each_with_index{|r, i|

    io.seek(r[:addr_offset], IO::SEEK_SET)

    dir_name = File.basename(pack_name)
    begin
      FileUtils.mkdir(dir_name, {:noop => false, :verbose=>false})
    rescue
    end

    path     = "#{dir_name}/#{r[:name]}"
    contents = io.read(r[:file_length])

    File.open(path, "w"){|f| f.write(contents) }

    puts "Done! file = #{path}, length = #{r[:file_length]}"
  }

end