diff two files by line with any type line character

linediff.js

var fs = require('fs');

var o = fs.readFileSync('./file1.txt').toString();
var oo = fs.readFileSync('./file2.txt').toString();

var get_lines_array = function(str) {

	if (typeof(str) != 'string') {
		console.log('must pass string to get_lines_array()');
		process.exit(1);
	}

	var lines = [];

	var c = 0;
	var line = '';
	var is_newline = false;

	while (c < str.length) {

		// \n \r or 
		if ((str[c] == '\n' || str[c] == '\r' || str.charCodeAt(c) == 13)) {
			if (!is_newline) {
				lines.push(line);
				line = '';
			}
			is_newline = true;
		} else {
			is_newline = false;
		}

		if (!is_newline) {
			line += str[c];
			is_newline == false;
		}

		c++;

	}

	return lines;

}

var o_lines = get_lines_array(o);
var oo_lines = get_lines_array(oo);

var longest = o_lines;
var shortest = oo_lines;

if (oo_lines.length > o_lines.length) {
	longest = oo_lines;
	shortest = o_lines;
}

var c = 0;
while (c < shortest.length) {

	if (longest[c] != shortest[c]) {

		var l_buffer = Buffer.from(longest[c], 'utf8');
		var s_buffer = Buffer.from(shortest[c], 'utf8');

		console.log('### LINE ' + c + ' DIFFERS');
		console.log(longest[c], l_buffer.toString('hex'));
		console.log(shortest[c], s_buffer.toString('hex'));

	}

	c++;
}