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-rw-r--r--program/js/common.js79
1 files changed, 79 insertions, 0 deletions
diff --git a/program/js/common.js b/program/js/common.js
index c13d95e3d..69ec28c4c 100644
--- a/program/js/common.js
+++ b/program/js/common.js
@@ -711,3 +711,82 @@ if (bw.ie)
return obj;
}
}
+
+// This code was written by Tyler Akins and has been placed in the
+// public domain. It would be nice if you left this header intact.
+// Base64 code from Tyler Akins -- http://rumkin.com
+var Base64 = (function () {
+ var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
+
+ var obj = {
+ /**
+ * Encodes a string in base64
+ * @param {String} input The string to encode in base64.
+ */
+ encode: function (input) {
+ if (typeof(window.btoa) === 'function')
+ return btoa(input);
+
+ var chr1, chr2, chr3, enc1, enc2, enc3, enc4, i = 0, output = '', len = input.length;
+
+ do {
+ 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
+ + keyStr.charAt(enc1) + keyStr.charAt(enc2)
+ + keyStr.charAt(enc3) + keyStr.charAt(enc4);
+ } while (i < len);
+
+ return output;
+ },
+
+ /**
+ * Decodes a base64 string.
+ * @param {String} input The string to decode.
+ */
+ decode: function (input) {
+ if (typeof(window.atob) === 'function')
+ return atob(input);
+
+ var chr1, chr2, chr3, enc1, enc2, enc3, enc4, len, i = 0, output = '';
+
+ // remove all characters that are not A-Z, a-z, 0-9, +, /, or =
+ input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
+ len = input.length;
+
+ do {
+ 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);
+ } while (i < len);
+
+ return output;
+ }
+ };
+
+ return obj;
+})();