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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) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Binary.php 18985 2009-11-14 18:51:34Z alexander $
*/
/** Zend_Pdf_Element_String */
require_once 'Zend/Pdf/Element/String.php';
/**
* PDF file 'binary string' element implementation
*
* @category Zend
* @package Zend_Pdf
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Pdf_Element_String_Binary extends Zend_Pdf_Element_String
{
/**
* Object value
*
* @var string
*/
public $value;
/**
* Escape string according to the PDF rules
*
* @param string $inStr
* @return string
*/
public static function escape($inStr)
{
return strtoupper(bin2hex($inStr));
}
/**
* Unescape string according to the PDF rules
*
* @param string $inStr
* @return string
*/
public static function unescape($inStr)
{
$chunks = array();
$offset = 0;
$length = 0;
while ($offset < strlen($inStr)) {
// Collect hexadecimal characters
$start = $offset;
$offset += strspn($inStr, "0123456789abcdefABCDEF", $offset);
$chunks[] = substr($inStr, $start, $offset - $start);
$length += strlen(end($chunks));
// Skip non-hexadecimal characters
$offset += strcspn($inStr, "0123456789abcdefABCDEF", $offset);
}
if ($length % 2 != 0) {
// We have odd number of digits.
// Final digit is assumed to be '0'
$chunks[] = '0';
}
return pack('H*' , implode($chunks));
}
/**
* Return object as string
*
* @param Zend_Pdf_Factory $factory
* @return string
*/
public function toString($factory = null)
{
return '<' . self::escape((string)$this->value) . '>';
}
}
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