Populate the Message.data field before handing off to extensions.

lib/websocket/driver/hybi.js

@@ -219,6 +219,7 @@ var instance = {
     if (runExtensions && this.MESSAGE_OPCODES.indexOf(frame.opcode) >= 0) {
       var message = new Message(frame.opcode === 1 ? 'text' : 'binary');
       message.pushFrame(frame);
+      message.read();
 
       return this._extensions.processOutgoingMessage(message, function(error, message) {
         if (error) return this._fail('extension_error', error.message);
@@ -424,13 +425,14 @@ var instance = {
   },
 
   _emitMessage: function(message, runExtensions) {
+    var payload = message.read();
+
     if (runExtensions)
       return this._extensions.processIncomingMessage(message, function(error, message) {
         if (error) return this._fail('extension_error', error.message);
         this._emitMessage(message);
       }, this);
 
-    var payload = message.read();
     if (message.type === 'text') payload = this._encode(payload);
     delete this._message;