require "enumerator" def convert(str,width=416) width /= 8 off = str[10,4].unpack("V").first header = str[0,off] data = str[off,str.size - off] data = data.enum_for(:scan, /.{#{width}}/m).map{|line| line.unpack("l*").map{|c| ~c}.pack("l*")…