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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_Ldap
  * @subpackage Filter
  * @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    $Id$
  */
 
 /**
  * Zend_Ldap_Filter_Abstract provides a base implementation for filters.
  *
  * @category   Zend
  * @package    Zend_Ldap
  * @subpackage Filter
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 abstract class Zend_Ldap_Filter_Abstract
 {
     /**
      * Returns a string representation of the filter.
      *
      * @return string
      */
     abstract public function toString();
 
     /**
      * Returns a string representation of the filter.
      * @see toString()
      *
      * @return string
      */
     public function __toString()
     {
         return $this->toString();
     }
 
     /**
      * Negates the filter.
      *
      * @return Zend_Ldap_Filter_Abstract
      */
     public function negate()
     {
         /**
          * Zend_Ldap_Filter_Not
          */
         // require_once 'Zend/Ldap/Filter/Not.php';
         return new Zend_Ldap_Filter_Not($this);
     }
 
     /**
      * Creates an 'and' filter.
      *
      * @param  Zend_Ldap_Filter_Abstract $filter,...
      * @return Zend_Ldap_Filter_And
      */
     public function addAnd($filter)
     {
         /**
          * Zend_Ldap_Filter_And
          */
         // require_once 'Zend/Ldap/Filter/And.php';
         $fa = func_get_args();
         $args = array_merge(array($this), $fa);
         return new Zend_Ldap_Filter_And($args);
     }
 
     /**
      * Creates an 'or' filter.
      *
      * @param  Zend_Ldap_Filter_Abstract $filter,...
      * @return Zend_Ldap_Filter_Or
      */
     public function addOr($filter)
     {
         /**
          * Zend_Ldap_Filter_Or
          */
         // require_once 'Zend/Ldap/Filter/Or.php';
         $fa = func_get_args();
         $args = array_merge(array($this), $fa);
         return new Zend_Ldap_Filter_Or($args);
     }
 
     /**
      * Escapes the given VALUES according to RFC 2254 so that they can be safely used in LDAP filters.
      *
      * Any control characters with an ACII code < 32 as well as the characters with special meaning in
      * LDAP filters "*", "(", ")", and "\" (the backslash) are converted into the representation of a
      * backslash followed by two hex digits representing the hexadecimal value of the character.
      * @see Net_LDAP2_Util::escape_filter_value() from Benedikt Hallinger <beni@php.net>
      * @link http://pear.php.net/package/Net_LDAP2
      * @author Benedikt Hallinger <beni@php.net>
      *
      * @param  string|array $values Array of values to escape
      * @return array Array $values, but escaped
      */
     public static function escapeValue($values = array())
     {
         /**
          * @see Zend_Ldap_Converter
          */
         // require_once 'Zend/Ldap/Converter.php';
 
         if (!is_array($values)) $values = array($values);
         foreach ($values as $key => $val) {
             // Escaping of filter meta characters
             $val = str_replace(array('\\', '*', '(', ')'), array('\5c', '\2a', '\28', '\29'), $val);
             // ASCII < 32 escaping
             $val = Zend_Ldap_Converter::ascToHex32($val);
             if (null === $val) $val = '\0';  // apply escaped "null" if string is empty
             $values[$key] = $val;
         }
         return (count($values) == 1) ? $values[0] : $values;
     }
 
     /**
      * Undoes the conversion done by {@link escapeValue()}.
      *
      * Converts any sequences of a backslash followed by two hex digits into the corresponding character.
      * @see Net_LDAP2_Util::escape_filter_value() from Benedikt Hallinger <beni@php.net>
      * @link http://pear.php.net/package/Net_LDAP2
      * @author Benedikt Hallinger <beni@php.net>
      *
      * @param  string|array $values Array of values to escape
      * @return array Array $values, but unescaped
      */
     public static function unescapeValue($values = array())
     {
         /**
          * @see Zend_Ldap_Converter
          */
         // require_once 'Zend/Ldap/Converter.php';
 
         if (!is_array($values)) $values = array($values);
         foreach ($values as $key => $value) {
             // Translate hex code into ascii
             $values[$key] = Zend_Ldap_Converter::hex32ToAsc($value);
         }
         return (count($values) == 1) ? $values[0] : $values;
     }
 }