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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_HeaderValue
 {
     /**
      * No public constructor.
      */
     private function __construct()
     {
     }
 
     /**
      * Filter the header value according to RFC 2822
      *
      * @see    http://www.rfc-base.org/txt/rfc-2822.txt (section 2.2)
      * @param  string $value
      * @return string
      */
     public static function filter($value)
     {
         $result = '';
         $tot    = strlen($value);
 
         // Filter for CR and LF characters, leaving CRLF + WSP sequences for
         // Long Header Fields (section 2.2.3 of RFC 2822)
         for ($i = 0; $i < $tot; $i += 1) {
             $ord = ord($value[$i]);
             if (($ord < 32 || $ord > 126)
                 && $ord !== 13
             ) {
                 continue;
             }
 
             if ($ord === 13) {
                 if ($i + 2 >= $tot) {
                     continue;
                 }
 
                 $lf = ord($value[$i + 1]);
                 $sp = ord($value[$i + 2]);
 
                 if ($lf !== 10 || $sp !== 32) {
                     continue;
                 }
 
                 $result .= "\r\n ";
                 $i += 2;
                 continue;
             }
 
             $result .= $value[$i];
         }
 
         return $result;
     }
 
     /**
      * Determine if the header value contains any invalid characters.
      *
      * @see    http://www.rfc-base.org/txt/rfc-2822.txt (section 2.2)
      * @param string $value
      * @return bool
      */
     public static function isValid($value)
     {
         $tot = strlen($value);
         for ($i = 0; $i < $tot; $i += 1) {
             $ord = ord($value[$i]);
             if (($ord < 32 || $ord > 126)
                 && $ord !== 13
             ) {
                 return false;
             }
 
             if ($ord === 13) {
                 if ($i + 2 >= $tot) {
                     return false;
                 }
 
                 $lf = ord($value[$i + 1]);
                 $sp = ord($value[$i + 2]);
 
                 if ($lf !== 10 || $sp !== 32) {
                     return false;
                 }
 
                 $i += 2;
             }
         }
 
         return true;
     }
 
     /**
      * Assert that the header value is valid.
      *
      * Raises an exception if invalid.
      *
      * @param string $value
      * @throws Exception\RuntimeException
      * @return void
      */
     public static function assertValid($value)
     {
         if (! self::isValid($value)) {
             // require_once 'Zend/Mail/Exception.php';
             throw new Zend_Mail_Exception('Invalid header value detected');
         }
     }
 }