ImageSize

# File lib/image_size.rb, line 40
  def initialize(img_data, img_type = nil)
    @img_data = img_data.dup
    @img_width  = nil
    @img_height = nil
    @img_type   = nil

    if @img_data.is_a?(IO)
      img_top = @img_data.read(1024)
      img_io = def_read_o(@img_data)
    elsif @img_data.is_a?(StringIO)
      img_top = @img_data.read(1024)
      img_io = def_read_o(@img_data)
    elsif @img_data.is_a?(String)
      img_top = @img_data[0, 1024]
#      img_io = StringIO.open(@img_data){|sio| io = def_read_o(sio); io }

      img_io = StringIO.open(@img_data)
      img_io = def_read_o(img_io)
    else
      raise "argument class error!! #{img_data.type}"
    end
    
    if @img_type.nil?
      @img_type = check_type(img_top)
    else
      type = Type.constants.find{|t| img_type == t }
      raise("type is failed. #{img_type}\n") if !type
      @img_type = img_type
    end

    if @img_type != Type::OTHER
      @img_width, @img_height = self.__send__("measure_#{@img_type}", img_io)
    else
      @img_width, @img_height = [nil, nil]
    end
    
    if @img_data.is_a?(String)
      img_io.close
    end
  end

# File lib/image_size.rb, line 33
def ImageSize.type_list
  Type.constants 
end

# File lib/image_size.rb, line 85
def get_height
  if @img_type == Type::OTHER then nil else @img_height end
end

# File lib/image_size.rb, line 95
def get_size
  [self.get_width, self.get_height]
end

# File lib/image_size.rb, line 82
def get_type; @img_type; end

# File lib/image_size.rb, line 90
def get_width
  if @img_type == Type::OTHER then nil else @img_width end
end