UniversalDetector.rb

            unless  @_mGotData
                # If the data starts with BOM, we know it is UTF
                if data[0,3] == "\xEF\xBB\xBF":
                    # EF BB BF  UTF-8 with BOM
                    @result = {"encoding"=> "UTF-8", "confidence"=> 1.0}
                elsif data[0,4] == "\xFF\xFE\x00\x00":
                    # FF FE 00 00  UTF-32, little-endian BOM
                    @result = {"encoding"=> "UTF-32LE", "confidence"=> 1.0}
                elsif data[0,4] == "\x00\x00\xFE\xFF": 
                    # 00 00 FE FF  UTF-32, big-endian BOM
                    @result = {"encoding"=> "UTF-32BE", "confidence"=> 1.0}
                elsif data[0,4] == "\xFE\xFF\x00\x00":
                    # FE FF 00 00  UCS-4, unusual octet order BOM (3412)
                    @result = {"encoding"=> "X-ISO-10646-UCS-4-3412", "confidence"=> 1.0}
                elsif data[0,4] == "\x00\x00\xFF\xFE":
                    # 00 00 FF FE  UCS-4, unusual octet order BOM (2143)
                    @result = {"encoding"=> "X-ISO-10646-UCS-4-2143", "confidence"=> 1.0}
                elsif data[0,4] == "\xFF\xFE":
                    # FF FE  UTF-16, little endian BOM
                    @result = {"encoding"=> "UTF-16LE", "confidence"=> 1.0}
                elsif data[0,2] == "\xFE\xFF":
                    # FE FF  UTF-16, big endian BOM
                    @result = {"encoding"=> "UTF-16BE", "confidence"=> 1.0}          
                end
            end