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[xmppchat.git] / js / strophejs / b64.js

diff --git a/js/strophejs/b64.js b/js/strophejs/b64.js
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+// 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 keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
+
+/**
+ * Encodes a string in base64
+ * @param {String} input The string to encode in base64.
+ */
+function encode64(input) {
+   var output = "";
+   var chr1, chr2, chr3;
+   var enc1, enc2, enc3, enc4;
+   var i = 0;
+
+   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 < input.length);
+
+   return output;
+}
+
+/**
+ * Decodes a base64 string.
+ * @param {String} input The string to decode.
+ */
+function decode64(input) {
+   var output = "";
+   var chr1, chr2, chr3;
+   var enc1, enc2, enc3, enc4;
+   var i = 0;
+
+   // remove all characters that are not A-Z, a-z, 0-9, +, /, or =
+   input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
+
+   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 < input.length);
+
+   return output;
+}