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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_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';
 
 /**
  * AsciiHex 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_AsciiHex implements Zend_Pdf_Filter_Interface
 {
     /**
      * Encode data
      *
      * @param string $data
      * @param array $params
      * @return string
      * @throws Zend_Pdf_Exception
      */
     public static function encode($data, $params = null)
     {
         return bin2hex($data) . '>';
     }
 
     /**
      * Decode data
      *
      * @param string $data
      * @param array $params
      * @return string
      * @throws Zend_Pdf_Exception
      */
     public static function decode($data, $params = null)
     {
         $output  = '';
         $oddCode = true;
         $commentMode = false;
 
         for ($count = 0; $count < strlen($data)  &&  $data[$count] != '>'; $count++) {
             $charCode = ord($data[$count]);
 
             if ($commentMode) {
                 if ($charCode == 0x0A  || $charCode == 0x0D ) {
                     $commentMode = false;
                 }
 
                 continue;
             }
 
             switch ($charCode) {
                 //Skip white space
                 case 0x00: // null character
                     // fall through to next case
                 case 0x09: // Tab
                     // fall through to next case
                 case 0x0A: // Line feed
                     // fall through to next case
                 case 0x0C: // Form Feed
                     // fall through to next case
                 case 0x0D: // Carriage return
                     // fall through to next case
                 case 0x20: // Space
                     // Do nothing
                     break;
 
                 case 0x25: // '%'
                     // Switch to comment mode
                     $commentMode = true;
                     break;
 
                 default:
                     if ($charCode >= 0x30 /*'0'*/ && $charCode <= 0x39 /*'9'*/) {
                         $code = $charCode - 0x30;
                     } else if ($charCode >= 0x41 /*'A'*/ && $charCode <= 0x46 /*'F'*/) {
                         $code = $charCode - 0x37/*0x41 - 0x0A*/;
                     } else if ($charCode >= 0x61 /*'a'*/ && $charCode <= 0x66 /*'f'*/) {
                         $code = $charCode - 0x57/*0x61 - 0x0A*/;
                     } else {
                         // require_once 'Zend/Pdf/Exception.php';
                         throw new Zend_Pdf_Exception('Wrong character in a encoded stream');
                     }
 
                     if ($oddCode) {
                         // Odd pass. Store hex digit for next pass
                         // Scope of $hexCodeHigh variable is whole function
                         $hexCodeHigh = $code;
                     } else {
                         // Even pass.
                         // Add decoded character to the output
                         // ($hexCodeHigh is stored in previous pass)
                         $output .= chr($hexCodeHigh*16 + $code);
                     }
                     $oddCode = !$oddCode;
 
                     break;
             }
         }
 
         /* Check that stream is terminated by End Of Data marker */
         if ($data[$count] != '>') {
             // require_once 'Zend/Pdf/Exception.php';
             throw new Zend_Pdf_Exception('Wrong encoded stream End Of Data marker.');
         }
 
         /* Last '0' character is omitted */
         if (!$oddCode) {
             $output .= chr($hexCodeHigh*16);
         }
 
         return $output;
     }
 }