From: Tom Metge <tom@...>
Date: 2007-08-27T06:16:33+09:00
Subject: Re: [SOLUTION] [QUIZ] ID3 Tags (#136)

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Hey all, here's another one for you.  I admit that there isn't anything
special about it... I think it's one of the more direct solutions (i.e.
Nothing clever here guys).  I didn't see a reason to include the entire
genre, so it's attached in a separate file.  It simply declares a constant
(an array which is indexed in read_tags).

Tom


--BEGIN SOLUTION--
require 'id3_tag_genre'

class NoTagError < RuntimeError; end

class Mp3
  attr_reader :song, :artist, :album, :year, :comment, :genre, :track
  
  def initialize(file)
    read_tags(file)
  end
  
  def read_tags(file)
    begin
      size = File.stat(file).size
      f = File.open(file)
      f.pos = size - 128
      tag = f.read
      raise NoTagError unless tag[0..2] == "TAG"
      @song = tag[3..32].strip
      @artist = tag[33..62].strip
      @album = tag[63..92].strip
      @year = tag[93..96].strip
      @comment = tag[97..126]
        if @comment[28] == 0 && @comment[29] != 0
          @track = @comment[29..29].to_i
          @comment = @comment[0..28].strip
        end
      @genre = Genre[tag[127]]
    rescue NoTagError
      puts "No tags found!"
      return false
    end
    true
  end
end


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