Class: Wizport::Rtf::Image

Inherits:
Element
  • Object
show all
Defined in:
lib/wizport/document/rtf/image.rb

Constant Summary collapse

JPEG_SOF_BLOCKS = 
[0xC0, 0xC1, 0xC2, 0xC3, 0xC5, 0xC6, 0xC7, 0xC9, 0xCA, 0xCB, 0xCD, 0xCE, 0xCF]
PIC_TYPE = 
{png: :pngblip, jpg: :jpegblip, bmp: :pngblip, gif: :pngblip}

Instance Method Summary collapse

Methods inherited from Element

#cmd, #delimit, #group, #txt, #write

Constructor Details

#initialize(rtf, file) ⇒ Image

Returns a new instance of Image.



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# File 'lib/wizport/document/rtf/image.rb', line 12

def initialize(rtf, file)
  super(rtf)
  begin
    @io = IO.binread(file)
  rescue  Exception => e
    STDERR.puts "** error parsing #{file}: #{e.inspect}"
    return
  end
  @width, @height = self.size
  group do
    cmd '*'
    cmd 'shppict'
    group do
      cmd :pict
      cmd PIC_TYPE[@type]
      cmd :picscalex, 99
      cmd :picscaley, 99
      cmd :picw, @width
      cmd :pich, @height
      write "\n"
      @io.each_byte do |b|
        hex_str = b.to_s(16)
        hex_str.insert(0,'0') if hex_str.length == 1
        write hex_str
      end
      write "\n"
    end
  end

end

Instance Method Details

#size ⇒ Object 



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# File 'lib/wizport/document/rtf/image.rb', line 64

def size
  case self.type
    when :gif
      @io[6..10].unpack('SS')
    when :png
      @io[16..24].unpack('NN')
    when :bmp
      d = @io[14..28]
      d.unpack('C')[0] == 40 ? d[4..-1].unpack('LL') : d[4..8].unpack('SS')
    when :jpg
      d = StringIO.new(@io)
      section_marker = 0xff # Section marker.

      d.seek(2) # Skip the first two bytes of JPEG identifier.

      loop do
        marker, code, length = d.read(4).unpack('CCn')
        fail "JPEG marker not found!" if marker != section_marker
        if JPEG_SOF_BLOCKS.include?(code)
          #@bits, @height, @width, @channels = d.read(6).unpack("CnnC")

          return d.read(6).unpack('CnnC')[1..2].reverse
        end
        d.seek(length - 2, IO::SEEK_CUR)
      end
  end
end

#type ⇒ Object 



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# File 'lib/wizport/document/rtf/image.rb', line 43

def type
  png = Regexp.new("\x89PNG".force_encoding("binary"))
  jpg = Regexp.new("\xff\xd8\xff\xe0\x00\x10JFIF".force_encoding("binary"))
  jpg2 = Regexp.new("\xff\xd8\xff\xe1(.*){2}Exif".force_encoding("binary"))

  @type = case @io
    when /^GIF8/
      :gif
    when /^#{png}/
      :png
    when /^#{jpg}/
      :jpg
    when /^#{jpg2}/
      :jpg
    when /^BM/
      :bmp
    else
      :unknown
  end
end