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+/* Copyright (C) 1999 Masanao Izumo <iz@onicos.co.jp>
+ * Version: 1.0
+ * LastModified: Dec 25 1999
+ * This library is free. You can redistribute it and/or modify it.
+ */
+ /* Modified by Chris Anderson to not use CommonJS */
+ /* Modified by Dan Webb not to require Narwhal's binary library */
+
+var Base64 = {};
+(function(exports) {
+
+ var encodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+ var decodeChars = [
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
+ 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
+ -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
+ 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
+ -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
+ 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1
+ ];
+
+ exports.encode = function (str) {
+ var out, i, length;
+ var c1, c2, c3;
+
+ length = len(str);
+ i = 0;
+ out = [];
+ while(i < length) {
+ c1 = str.charCodeAt(i++) & 0xff;
+ if(i == length)
+ {
+ out.push(encodeChars.charCodeAt(c1 >> 2));
+ out.push(encodeChars.charCodeAt((c1 & 0x3) << 4));
+ out.push("=".charCodeAt(0));
+ out.push("=".charCodeAt(0));
+ break;
+ }
+ c2 = str.charCodeAt(i++);
+ if(i == length)
+ {
+ out.push(encodeChars.charCodeAt(c1 >> 2));
+ out.push(encodeChars.charCodeAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4)));
+ out.push(encodeChars.charCodeAt((c2 & 0xF) << 2));
+ out.push("=".charCodeAt(0));
+ break;
+ }
+ c3 = str.charCodeAt(i++);
+ out.push(encodeChars.charCodeAt(c1 >> 2));
+ out.push(encodeChars.charCodeAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4)));
+ out.push(encodeChars.charCodeAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6)));
+ out.push(encodeChars.charCodeAt(c3 & 0x3F));
+ }
+
+ var str = "";
+ out.forEach(function(chr) { str += String.fromCharCode(chr) });
+ return str;
+ };
+
+ exports.decode = function (str) {
+ var c1, c2, c3, c4;
+ var i, length, out;
+
+ length = len(str);
+ i = 0;
+ out = [];
+ while(i < length) {
+ /* c1 */
+ do {
+ c1 = decodeChars[str.charCodeAt(i++) & 0xff];
+ } while(i < length && c1 == -1);
+ if(c1 == -1)
+ break;
+
+ /* c2 */
+ do {
+ c2 = decodeChars[str.charCodeAt(i++) & 0xff];
+ } while(i < length && c2 == -1);
+ if(c2 == -1)
+ break;
+
+ out.push(String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4)));
+
+ /* c3 */
+ do {
+ c3 = str.charCodeAt(i++) & 0xff;
+ if(c3 == 61)
+ return out.join('');
+ c3 = decodeChars[c3];
+ } while(i < length && c3 == -1);
+ if(c3 == -1)
+ break;
+
+ out.push(String.fromCharCode(((c2 & 0xF) << 4) | ((c3 & 0x3C) >> 2)));
+
+ /* c4 */
+ do {
+ c4 = str.charCodeAt(i++) & 0xff;
+ if(c4 == 61)
+ return out.join('');
+ c4 = decodeChars[c4];
+ } while(i < length && c4 == -1);
+
+ if(c4 == -1)
+ break;
+
+ out.push(String.fromCharCode(((c3 & 0x03) << 6) | c4));
+ }
+
+ return out.join('');
+ };
+
+ var len = function (object) {
+ if (object.length !== undefined) {
+ return object.length;
+ } else if (object.getLength !== undefined) {
+ return object.getLength();
+ } else {
+ return undefined;
+ }
+ };
+})(Base64);