<?php
/*
* This file is part of the PHPASN1 library.
*
* Copyright © Friedrich Große <friedrich.grosse@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace FG\ASN1\Universal;
use FG\ASN1\ASNObject;
use FG\ASN1\Parsable;
use FG\ASN1\Identifier;
use FG\ASN1\Exception\ParserException;
class NullObject extends ASNObject implements Parsable
{
public function getType()
{
return Identifier::NULL;
}
protected function calculateContentLength()
{
return 0;
}
protected function getEncodedValue()
{
return null;
}
public function getContent()
{
return 'NULL';
}
public static function fromBinary(&$binaryData, &$offsetIndex = 0)
{
self::parseIdentifier($binaryData[$offsetIndex], Identifier::NULL, $offsetIndex++);
$contentLength = self::parseContentLength($binaryData, $offsetIndex);
if ($contentLength != 0) {
throw new ParserException("An ASN.1 Null should not have a length other than zero. Extracted length was {$contentLength}", $offsetIndex);
}
$parsedObject = new self();
$parsedObject->setContentLength(0);
return $parsedObject;
}
}