DumpPayload.rb

#!/usr/bin/ruby

require 'rubygems'
require 'id3lib'

def usage()
  scriptName = File.basename($0)
  STDERR.puts "Usage: #{scriptName} <mp3-file>"
  exit 1
end

if ARGV.length != 1 then
  usage
end
file = ARGV[0]
if !File.readable? ARGV[0] then
  STDERR.puts "Error: Cannot read the file you provided. [#{file}]"
  usage
end

tags = ID3Lib::Tag.new(file)

uitsFaq = "http://uits.umusic.com/faq.htm"

uitsPrivFrame = tags.find{|frame| frame[:id] == :PRIV && frame[:owner] = uitsFaq}

if uitsPrivFrame == nil then
  STDERR.puts "Cannot find UITS PRIV frame with owner attribute of #{uitsFaq}"
  exit 1
end

uitsXml = uitsPrivFrame[:data].sub(/\000+$/, "")
puts uitsXml