126 lines
3.4 KiB
JavaScript
126 lines
3.4 KiB
JavaScript
// Base64 implementation stolen from http://www.webtoolkit.info/javascript-base64.html
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// variable names changed to make obfuscation easier
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var Base64 = {
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// private property
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_keyStr:"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
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// private method
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_utf8_encode : function ( input ){
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input = input.replace(/\r\n/g,"\\n");
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var utftext = "";
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var input_idx;
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for (input_idx = 0; input_idx < input.length; input_idx++) {
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var chr = input.charCodeAt(input_idx);
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if (chr < 128) {
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utftext += String.fromCharCode(chr);
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}
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else if((chr > 127) && (chr < 2048)) {
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utftext += String.fromCharCode((chr >> 6) | 192);
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utftext += String.fromCharCode((chr & 63) | 128);
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} else {
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utftext += String.fromCharCode((chr >> 12) | 224);
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utftext += String.fromCharCode(((chr >> 6) & 63) | 128);
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utftext += String.fromCharCode((chr & 63) | 128);
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}
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}
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return utftext;
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},
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// public method for encoding
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encode : function( input ) {
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var output = "";
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var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
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var input_idx = 0;
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input = Base64._utf8_encode(input);
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while (input_idx < input.length) {
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chr1 = input.charCodeAt( input_idx++ );
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chr2 = input.charCodeAt( input_idx++ );
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chr3 = input.charCodeAt( input_idx++ );
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enc1 = chr1 >> 2;
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enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
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enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
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enc4 = chr3 & 63;
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if (isNaN(chr2)) {
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enc3 = enc4 = 64;
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} else if (isNaN(chr3)) {
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enc4 = 64;
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}
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output = output +
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this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
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this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);
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}
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return output;
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},
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// public method for decoding
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decode : function (input) {
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var output = "";
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var chr1, chr2, chr3;
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var enc1, enc2, enc3, enc4;
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var i = 0;
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input = input.replace(/[^A-Za-z0-9\+\/\\=]/g, "");
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while (i < input.length) {
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enc1 = this._keyStr.indexOf(input.charAt(i++));
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enc2 = this._keyStr.indexOf(input.charAt(i++));
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enc3 = this._keyStr.indexOf(input.charAt(i++));
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enc4 = this._keyStr.indexOf(input.charAt(i++));
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chr1 = (enc1 << 2) | (enc2 >> 4);
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chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
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chr3 = ((enc3 & 3) << 6) | enc4;
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output = output + String.fromCharCode(chr1);
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if (enc3 != 64) {
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output = output + String.fromCharCode(chr2);
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}
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if (enc4 != 64) {
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output = output + String.fromCharCode(chr3);
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}
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}
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output = Base64._utf8_decode(output);
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return output;
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},
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_utf8_decode : function (utftext) {
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var string = "";
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var input_idx = 0;
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var chr1 = 0;
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var chr2 = 0;
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var chr3 = 0;
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while ( input_idx < utftext.length ) {
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chr1 = utftext.charCodeAt(input_idx);
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if (chr1 < 128) {
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string += String.fromCharCode(chr1);
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input_idx++;
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}
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else if((chr1 > 191) && (chr1 < 224)) {
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chr2 = utftext.charCodeAt(input_idx+1);
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string += String.fromCharCode(((chr1 & 31) << 6) | (chr2 & 63));
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input_idx += 2;
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} else {
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chr2 = utftext.charCodeAt(input_idx+1);
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chr3 = utftext.charCodeAt(input_idx+2);
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string += String.fromCharCode(((chr1 & 15) << 12) | ((chr2 & 63) << 6) | (chr3 & 63));
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input_idx += 3;
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}
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}
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return string;
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}
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}; |