File indexing completed on 2025-01-19 05:21:21

 <?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_Pdf
  * @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_Pdf_Filter_Interface */
 // require_once 'Zend/Pdf/Filter/Interface.php';
 
 /**
  * RunLength stream filter
  *
  * @package    Zend_Pdf
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Pdf_Filter_RunLength implements Zend_Pdf_Filter_Interface
 {
     /**
      * Encode data
      *
      * @param string $data
      * @param array $params
      * @return string
      * @throws Zend_Pdf_Exception
      */
     public static function encode($data, $params = null)
     {
         $output = '';
 
         $chainStartOffset = 0;
         $offset = 0;
 
         while ($offset < strlen($data)) {
             // Do not encode 2 char chains since they produce 2 char run sequence,
             // but it takes more time to decode such output (because of processing additional run)
             if (($repeatedCharChainLength = strspn($data, $data[$offset], $offset + 1, 127) + 1)  >  2) {
                 if ($chainStartOffset != $offset) {
                     // Drop down previouse (non-repeatable chars) run
                     $output .= chr($offset - $chainStartOffset - 1)
                              . substr($data, $chainStartOffset, $offset - $chainStartOffset);
                 }
 
                 $output .= chr(257 - $repeatedCharChainLength) . $data[$offset];
 
                 $offset += $repeatedCharChainLength;
                 $chainStartOffset = $offset;
             } else {
                 $offset++;
 
                 if ($offset - $chainStartOffset == 128) {
                     // Maximum run length is reached
                     // Drop down non-repeatable chars run
                     $output .= "\x7F" . substr($data, $chainStartOffset, 128);
 
                     $chainStartOffset = $offset;
                 }
             }
         }
 
         if ($chainStartOffset != $offset) {
             // Drop down non-repeatable chars run
             $output .= chr($offset - $chainStartOffset - 1) . substr($data, $chainStartOffset, $offset - $chainStartOffset);
         }
 
         $output .= "\x80";
 
         return $output;
     }
 
     /**
      * Decode data
      *
      * @param string $data
      * @param array $params
      * @return string
      * @throws Zend_Pdf_Exception
      */
     public static function decode($data, $params = null)
     {
         $dataLength = strlen($data);
         $output = '';
         $offset = 0;
 
         while($offset < $dataLength) {
             $length = ord($data[$offset]);
 
             $offset++;
 
             if ($length == 128) {
                 // EOD byte
                 break;
             } else if ($length < 128) {
                 $length++;
 
                 $output .= substr($data, $offset, $length);
 
                 $offset += $length;
             } else if ($length > 128) {
                 $output .= str_repeat($data[$offset], 257 - $length);
 
                 $offset++;
             }
         }
 
         return $output;
     }
 }