module BinaryFileStringUtils
 def byte_to_int
   self.unpack('U').first
 end

 def little_endian_to_int
   # source : http://stackoverflow.com/questions/5236059/unpack-signed-little-endian-in-ruby
   arr, bits, num = self.unpack('V*'), 0, 0
   arr.each do |int|
     num += int << bits
     bits += 32
   end
   num >= 2**(bits-1) ? num - 2**bits : num  # Convert from unsigned to signed
 end
end
String.send :include, BinaryFileStringUtils