Binary.php

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<?php
#require_once 'Zend/Pdf/Element/String.php';


class Zend_Pdf_Element_String_Binary extends Zend_Pdf_Element_String
{
    public $value;


    public static function escape($inStr)
    {
        return strtoupper(bin2hex($inStr));
    }


    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));
    }


    public function toString($factory = null)
    {
        return '<' . self::escape((string)$this->value) . '>';
    }
}