From 284aac2883ec492f3ba501f827f73c2f654460a1 Mon Sep 17 00:00:00 2001
From: Aleksander Machniak <alec@alec.pl>
Date: Fri, 14 Aug 2015 05:08:54 -0400
Subject: [PATCH] Really make base64 encoding unicode-aware

---
 program/js/common.js | 67 ++++++++++++++++++++++++++++++++++++++------
 1 file changed, 59 insertions(+), 8 deletions(-)

diff --git a/program/js/common.js b/program/js/common.js
index 2c699d0f6..7a0c3036f 100644
--- a/program/js/common.js
+++ b/program/js/common.js
@@ -683,12 +683,61 @@ rcube_parse_query = function(query)
 };
 
 
-// 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+/=";
 
+  // private method for UTF-8 encoding
+  var utf8_encode = function(string) {
+    string = string.replace(/\r\n/g, "\n");
+    var utftext = '';
+
+    for (var n = 0; n < string.length; n++) {
+      var 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 method for UTF-8 decoding
+  var utf8_decode = function (utftext) {
+    var i = 0, string = '', c = c2 = c3 = 0;
+
+    while (i < utftext.length) {
+      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;
+  };
+
   var obj = {
     /**
      * Encodes a string in base64
@@ -703,9 +752,11 @@ var Base64 = (function () {
         catch (e) {};
       }
 
+      input = utf8_encode(input);
+
       var chr1, chr2, chr3, enc1, enc2, enc3, enc4, i = 0, output = '', len = input.length;
 
-      do {
+      while (i < len) {
         chr1 = input.charCodeAt(i++);
         chr2 = input.charCodeAt(i++);
         chr3 = input.charCodeAt(i++);
@@ -723,7 +774,7 @@ var Base64 = (function () {
         output = output
           + keyStr.charAt(enc1) + keyStr.charAt(enc2)
           + keyStr.charAt(enc3) + keyStr.charAt(enc4);
-      } while (i < len);
+      }
 
       return output;
     },
@@ -736,7 +787,7 @@ var Base64 = (function () {
       if (typeof(window.atob) === 'function') {
         // it may fail on unicode characters, the fallback can handle them
         try {
-          return atob(input);
+          return utf8_decode(atob(input));
         }
         catch (e) {};
       }
@@ -747,7 +798,7 @@ var Base64 = (function () {
       input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
       len = input.length;
 
-      do {
+      while (i < len) {
         enc1 = keyStr.indexOf(input.charAt(i++));
         enc2 = keyStr.indexOf(input.charAt(i++));
         enc3 = keyStr.indexOf(input.charAt(i++));
@@ -763,9 +814,9 @@ var Base64 = (function () {
           output = output + String.fromCharCode(chr2);
         if (enc4 != 64)
           output = output + String.fromCharCode(chr3);
-      } while (i < len);
+      }
 
-      return output;
+      return utf8_decode(output);
     }
   };