ZP-797 WBXMLDecoder->getTermStr(): use stream_get_line().

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

while importing 1340 contacts on an android 4.4,
getTermStr was called 12021 times (and getByte 216005 times)
This simplify greatly the code and improve performance

src/lib/wbxml/wbxmldecoder.php

@@ -578,17 +578,12 @@ class WBXMLDecoder extends WBXMLDefs {
      * @return string
      */
     private function getTermStr() {
-        $str = "";
-        while(1) {
-            $in = $this->getByte();
-
-            if($in == 0)
-                break;
-            else
-                $str .= chr($in);
-        }
-
-        return $str;
+        // there is no unlimited "length" for stream_get_line,
+        // so we use a huge value for "length" param (1Gb)
+        // (0 == PHP_SOCK_CHUNK_SIZE (8192))
+        // internaly php read at most PHP_SOCK_CHUNK_SIZE at a time,
+        // so we can use a huge value for "length" without problem
+        return stream_get_line($this->in, 1073741824, "\0");
     }
 
     /**