use TextEncoding for string<->ArrayBuffer

requires text-encoding js polyfill, for now

IPython/html/static/services/kernels/js/kernel.js

@@ -5,10 +5,10 b' define(['
     'base/js/namespace',
     'jquery',
     'base/js/utils',
-    'services/kernels/js/comm',
-    'widgets/js/init',
-    './serialize'
-], function(IPython, $, utils, comm, widgetmanager, serialize) {
+    './comm',
+    './serialize',
+    'widgets/js/init'
+], function(IPython, $, utils, comm, serialize, widgetmanager) {
     "use strict";
 
     /**

IPython/html/static/services/kernels/js/serialize.js

@@ -3,7 +3,6 b''
 
 define([
     'jquery',
-    'components/utf8/utf8'
     ], function ($, utf8) {
     "use strict";
     
@@ -16,14 +15,9 b' define(['
         for (i = 1; i <= nbufs; i++) {
             offsets.push(data.getInt32(i * 4));
         }
-        // have to convert array to string for utf8.js
-        var bytestring = String.fromCharCode.apply(null,
-            new Uint8Array(buf.slice(offsets[0], offsets[1]))
-        );
+        var json_bytes = new Uint8Array(buf.slice(offsets[0], offsets[1]));
         var msg = $.parseJSON(
-            utf8.decode(
-                bytestring
-            )
+            (new TextDecoder('utf8')).decode(json_bytes)
         );
         // the remaining chunks are stored as DataViews in msg.buffers
         msg.buffers = [];
@@ -66,16 +60,6 b' define(['
         }
     };
     
-    var _bytes2buf = function (bytestring) {
-        // convert bytestring to UInt8Array
-        var nbytes = bytestring.length;
-        var buf = new Uint8Array(nbytes);
-        for (var i = 0; i < nbytes; i++) {
-            buf[i] = bytestring.charCodeAt(i);
-        }
-        return buf;
-    };
-    
     var _serialize_binary = function (msg) {
         // implement the binary serialization protocol
         // serializes JSON message to ArrayBuffer
@@ -83,7 +67,7 b' define(['
         var offsets = [];
         var buffers = msg.buffers;
         delete msg.buffers;
-        var json_utf8 = _bytes2buf(utf8.encode(JSON.stringify(msg)));
+        var json_utf8 = (new TextEncoder('utf8')).encode(JSON.stringify(msg));
         buffers.unshift(json_utf8);
         var nbufs = buffers.length;
         offsets.push(4 * (nbufs + 1));
@@ -112,7 +96,6 b' define(['
     };
     
     var serialize = function (msg) {
-        console.log(msg.buffers, msg.buffers.length);
         if (msg.buffers && msg.buffers.length) {
             return _serialize_binary(msg);
         } else {

IPython/html/templates/notebook.html

@@ -311,6 +311,7 b' class="notebook_app"'
 {% block script %}
 {{super()}}
 
+<script src="{{ static_url("components/text-encoding/lib/encoding.js") }}" charset="utf-8"></script>
 
 <script src="{{ static_url("notebook/js/main.js") }}" charset="utf-8"></script>