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<?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 Exception;
use FG\ASN1\ASNObject;
use FG\ASN1\Parsable;
use FG\ASN1\Identifier;
class OctetString extends ASNObject implements Parsable
{
protected $value;
public function __construct($value)
{
if (is_string($value)) {
// remove gaps between hex digits
$value = preg_replace('/\s|0x/', '', $value);
} elseif (is_numeric($value)) {
$value = dechex($value);
} elseif ($value === null) {
return;
} else {
throw new Exception('OctetString: unrecognized input type!');
}
if (strlen($value) % 2 != 0) {
// transform values like 1F2 to 01F2
$value = '0'.$value;
}
$this->value = $value;
}
public function getType()
{
return Identifier::OCTETSTRING;
}
protected function calculateContentLength()
{
return strlen($this->value) / 2;
}
protected function getEncodedValue()
{
$value = $this->value;
$result = '';
//Actual content
while (strlen($value) >= 2) {
// get the hex value byte by byte from the string and and add it to binary result
$result .= chr(hexdec(substr($value, 0, 2)));
$value = substr($value, 2);
}
return $result;
}
public function getContent()
{
return strtoupper($this->value);
}
public function getBinaryContent()
{
return $this->getEncodedValue();
}
public static function fromBinary(&$binaryData, &$offsetIndex = 0)
{
self::parseIdentifier($binaryData[$offsetIndex], Identifier::OCTETSTRING, $offsetIndex++);
$contentLength = self::parseContentLength($binaryData, $offsetIndex);
$value = substr($binaryData, $offsetIndex, $contentLength);
$offsetIndex += $contentLength;
$parsedObject = new self(bin2hex($value));
$parsedObject->setContentLength($contentLength);
return $parsedObject;
}
}
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