# File lib/mechanize/util.rb, line 78
  def self.detect_charset(src)
    case enc = src && NKF.guess(src)
    when Integer
      # Ruby <= 1.8
      CODE_DIC[enc]
    else
      # Ruby >= 1.9
      enc && enc.to_s.upcase
    end || "ISO-8859-1"
  end