ZP-797 WBXMLDecoder->_getToken() speedup.

Released under the Affero GNU General Public License (AGPL) version 3.

When importing 1340 contacts on an android,
this is called 41437 times. With this small
optimisation, we save 0,44s (2,47 -> 2,03)

src/lib/wbxml/wbxmldecoder.php

@@ -360,10 +360,10 @@ class WBXMLDecoder extends WBXMLDefs {
 
         WBXMLDecoder::ResetInWhile("decoderGetToken");
         while(WBXMLDecoder::InWhile("decoderGetToken")) {
-            $byte = $this->getByte();
-
-            if(!isset($byte))
+            $byte = fread($this->in, 1);
+            if($byte === "" || $byte === false)
                 break;
+            $byte = ord($byte);
 
             switch($byte) {
                 case WBXML_SWITCH_PAGE: