Issue #1407670 by Ivan Simonov, GaëlG, franz: drupal_strlen() doesn't work...

Issue #1407670 by Ivan Simonov, GaëlG, franz: drupal_strlen() doesn't work when parsing multibyte strings in CSVParser.

libraries/ParserCSV.inc

@@ -214,7 +214,9 @@ class ParserCSV {
       $currentField = '';
       $fields = array();
 
-      while ($currentIndex <= drupal_strlen($line)) {
+      // We must use strlen() as we're parsing byte by byte using strpos(), so
+      // drupal_strlen() will not work properly.
+      while ($currentIndex <= strlen($line)) {
         if ($quoted) {
           $nextQuoteIndex = strpos($line, '"', $currentIndex);