Initial catchat commit.

decode_image.rb

@@ -0,0 +1,51 @@
+class DecodeImage
+  @@password = ""
+  @@utils
+
+  def initialize(pass, image)
+    @@password = pass
+
+    # initializing utils...
+    @@utils = ImageUtils.new(@@password, image)
+
+    @@table = @@utils.generateLookupTable
+  end
+
+  def decode
+    s = @@utils.getImage.getSize
+
+    msg_bits = 0
+
+    @@table.reverse.each do |loc|
+      pixel = @@utils.getImage.getPixel(loc[:x], loc[:y])
+      msg_bits = (msg_bits << 6) | pixel.decodeBits
+    end
+
+#this trash needs to move somewhere...
+puts "Try to convert the message..."
+    len = msg_bits & 0xffff
+    msg_bits = msg_bits >> 16
+
+    # check the padding bits....
+    if (msg_bits & 255) != 0 then
+puts "Padding failed scrutiny! "
+puts msg_bits.to_s(2)
+      return false
+    end
+
+    msg_bits = msg_bits >> 8
+
+puts "Padding passed scrutiny..."
+    msg_chars = []
+
+    while msg_bits > 0 do
+      byte = msg_bits & 0xff
+      msg_chars.push(byte.chr)
+      msg_bits = msg_bits >> 8
+    end
+
+    msg = msg_chars.reverse.join
+
+    return msg
+  end
+end