Fix encoding and one byte field issue

git-svn-id: http://php-reader.googlecode.com/svn/trunk@12 51a70ab9-7547-0410-9469-37e369ee0574

src/ID3/Frame/POSS.php

@@ -69,7 +69,7 @@ final class ID3_Frame_POSS extends ID3_Frame
   {
     parent::__construct($reader);
 
-    $this->_format = substr($this->_data, 0, 1);
+    $this->_format = ord($this->_data{0});
     $this->_position = Transform::getInt32BE(substr($this->_data, 1, 4));
   }