platypus_ie.js

/*!
 * platypus.js v0.1
 * http://janhancic.github.com/platypus.js/
 *
 * Copyright 2013 Jan Hančič
 * Released under the MIT license
 * https://github.com/janhancic/platypus.js/blob/master/LICENSE.md
 *
 * Date: 2013-01-26
 */
var platypus = (function ( platypus, window ) {
	'use strict';

	if ( window.atob ) {
		return platypus;
	}

	// this code is from here: http://stackoverflow.com/questions/11524268/atob-not-working-in-ie/11577401#11577401
	// I have to find the right attribution for it
	var _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

	// public method for decoding
	function decode ( input ) {
		var output = "";
		var chr1, chr2, chr3;
		var enc1, enc2, enc3, enc4;
		var i = 0;

		input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

		while (i < input.length) {
			enc1 = _keyStr.indexOf(input.charAt(i++));
			enc2 = _keyStr.indexOf(input.charAt(i++));
			enc3 = _keyStr.indexOf(input.charAt(i++));
			enc4 = _keyStr.indexOf(input.charAt(i++));

			chr1 = (enc1 << 2) | (enc2 >> 4);
			chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
			chr3 = ((enc3 & 3) << 6) | enc4;

			output = output + String.fromCharCode(chr1);

			if (enc3 != 64) {
				output = output + String.fromCharCode(chr2);
			}
			if (enc4 != 64) {
				output = output + String.fromCharCode(chr3);
			}
		}

		output = utf8_decode(output);

		return output;
	};

	function utf8_decode ( utftext ) {
		var string = "";
		var i = 0;
		var c = c1 = c2 = 0;

		while ( i < utftext.length ) {
			c = utftext.charCodeAt(i);

			if (c < 128) {
				string += String.fromCharCode(c);
				i++;
			} else if((c > 191) && (c < 224)) {
				c2 = utftext.charCodeAt(i+1);
				string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
				i += 2;
			} else {
				c2 = utftext.charCodeAt(i+1);
				c3 = utftext.charCodeAt(i+2);
				string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
				i += 3;
			}
		}

		return string;
	};

	platypus.base64Decode = decode;

	return platypus;
} ( platypus || {}, window ) );