MP3 ID3 Tag Reader

mp3tagreader.rb

filename = ARGV

fields_and_sizes = [[:track_name, 30], [:artist_name, 30],[:album_name, 30], [:year, 4], [:comment, 30],
                    [:genre, 1]]
tag = Hash.new

File.open(filename.first) do |f|
  f.seek(-128, IO::SEEK_END)
  if f.read(3) == 'TAG' 
    fields_and_sizes.each do |field, size|
      data = f.read(size).gsub(/\000.*/, '')
      data = data.to_i if field == :genre
      tag[field] = data
    end
  end
end

tag.each do |key, value|
  puts "#{key} : #{value}"
end