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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Mail
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 
 /**
  * @category   Zend
  * @package    Zend_Mail
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 final class Zend_Mail_Header_HeaderName
 {
     /**
      * No public constructor.
      */
     private function __construct()
     {
     }
 
     /**
      * Filter the header name according to RFC 2822
      *
      * @see    http://www.rfc-base.org/txt/rfc-2822.txt (section 2.2)
      * @param  string $name
      * @return string
      */
     public static function filter($name)
     {
         $result = '';
         $tot    = strlen($name);
         for ($i = 0; $i < $tot; $i += 1) {
             $ord = ord($name[$i]);
             if ($ord > 32 && $ord < 127 && $ord !== 58) {
                 $result .= $name[$i];
             }
         }
         return $result;
     }
 
     /**
      * Determine if the header name contains any invalid characters.
      *
      * @param string $name
      * @return bool
      */
     public static function isValid($name)
     {
         $tot = strlen($name);
         for ($i = 0; $i < $tot; $i += 1) {
             $ord = ord($name[$i]);
             if ($ord < 33 || $ord > 126 || $ord === 58) {
                 return false;
             }
         }
         return true;
     }
 
     /**
      * Assert that the header name is valid.
      *
      * Raises an exception if invalid.
      *
      * @param string $name
      * @throws Exception\RuntimeException
      * @return void
      */
     public static function assertValid($name)
     {
         if (! self::isValid($name)) {
             // require_once 'Zend/Mail/Exception.php';
             throw new Zend_Mail_Exception('Invalid header name detected');
         }
     }
 }