/* jshint bitwise:false */ /** * @class Ext.util.Base64 * * Base64 is a group of similar binary-to-text encoding schemes that represent binary data * in an ASCII string format by translating it into a radix-64 representation. * * This class is an implementation of base64 encoding and decoding functions and is UTF-8 safe. * * @singleton */Ext.define('Ext.util.Base64', { singleton: true, /** * @private */ _str: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=", /** * Encodes given string in to base64 formatted string * @param input * @return {string} */ encode: function(input) { var me = this, output = '', i = 0, chr1, chr2, chr3, enc1, enc2, enc3, enc4, len; input = me._utf8_encode(input); len = input.length; while (i < len) { chr1 = input.charCodeAt(i++); chr2 = input.charCodeAt(i++); chr3 = input.charCodeAt(i++); enc1 = chr1 >> 2; enc2 = ((chr1 & 3) << 4) | (chr2 >> 4); enc3 = ((chr2 & 15) << 2) | (chr3 >> 6); enc4 = chr3 & 63; if (isNaN(chr2)) { enc3 = enc4 = 64; } else if (isNaN(chr3)) { enc4 = 64; } output = output + me._str.charAt(enc1) + me._str.charAt(enc2) + me._str.charAt(enc3) + me._str.charAt(enc4); } return output; }, /** * Decodes given base64 formatted string * @param input * @return {string} */ decode: function(input) { var me = this, output = '', i = 0, chr1, chr2, chr3, enc1, enc2, enc3, enc4, len; input = input.replace(/[^A-Za-z0-9+=\/]/g, ""); // eslint-disable-line no-useless-escape len = input.length; while (i < len) { enc1 = me._str.indexOf(input.charAt(i++)); enc2 = me._str.indexOf(input.charAt(i++)); enc3 = me._str.indexOf(input.charAt(i++)); enc4 = me._str.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 = me._utf8_decode(output); return output; }, /** * @private * UTF-8 encoding */ _utf8_encode: function(string) { var utftext = '', c, n, len; string = string.replace(/\r\n/g, "\n"); for (n = 0, len = string.length; n < len; n++) { c = string.charCodeAt(n); if (c < 128) { utftext += String.fromCharCode(c); } else if ((c > 127) && (c < 2048)) { utftext += String.fromCharCode((c >> 6) | 192); utftext += String.fromCharCode((c & 63) | 128); } else { utftext += String.fromCharCode((c >> 12) | 224); utftext += String.fromCharCode(((c >> 6) & 63) | 128); utftext += String.fromCharCode((c & 63) | 128); } } return utftext; }, /** * @private * UTF-8 decoding */ _utf8_decode: function(utftext) { var string = '', i = 0, c = 0, c3 = 0, c2 = 0, len = utftext.length; while (i < len) { 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; }});