<?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) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 * @version    $Id: Binary.php 20096 2010-01-06 02:05:09Z bkarwin $

 */

/** 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) 2005-2010 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) . '>';

    }

}