Write a Ruby program that analyzes an MP3 file. Many MP3 files have a 128-byte data structure at the end called an ID3 tag. These 128 bytes are literally packed with information about the song: its name, the artist, which album it's from, and so on. You can parse this data structure by opening an MP3 file and doing a series of reads from a posit…

text_analyzer.rb

class TextAnalyzer
  def initialize
    @file = File.open("song.mp3")
  end

  def has_tag?
    @file.seek(-128, IO::SEEK_END)
    @file.read(3) == 'TAG'
  end

  def read_info
    if has_tag?
      @info = @file.read
      @file.close
      @info = {
        title: @info.byteslice(0, 30),
        author: @info.byteslice(30, 30),
        album: @info.byteslice(60, 30),
        year:  @info.byteslice(90, 4),
        comment: @info.byteslice(94, 30)
      }
    else
      'File does not contain information'
    end
  end

  private :has_tag?

end

ciao = TextAnalyzer.new
info = ciao.read_info
info.each do|key, value|
  puts "#{key} ==> #{value}"
end

on line 23 must be

{ error: 'File does not contain information' }