92 lines
2.3 KiB
PHP
92 lines
2.3 KiB
PHP
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<?php
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/*
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* This file is part of the PHPASN1 library.
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*
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* Copyright © Friedrich Große <friedrich.grosse@gmail.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace FG\ASN1\Universal;
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use Exception;
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use FG\ASN1\ASNObject;
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use FG\ASN1\Parsable;
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use FG\ASN1\Identifier;
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class OctetString extends ASNObject implements Parsable
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{
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protected $value;
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public function __construct($value)
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{
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if (is_string($value)) {
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// remove gaps between hex digits
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$value = preg_replace('/\s|0x/', '', $value);
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} elseif (is_numeric($value)) {
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$value = dechex($value);
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} elseif ($value === null) {
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return;
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} else {
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throw new Exception('OctetString: unrecognized input type!');
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}
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if (strlen($value) % 2 != 0) {
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// transform values like 1F2 to 01F2
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$value = '0'.$value;
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}
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$this->value = $value;
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}
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public function getType()
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{
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return Identifier::OCTETSTRING;
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}
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protected function calculateContentLength()
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{
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return strlen($this->value) / 2;
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}
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protected function getEncodedValue()
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{
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$value = $this->value;
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$result = '';
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//Actual content
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while (strlen($value) >= 2) {
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// get the hex value byte by byte from the string and and add it to binary result
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$result .= chr(hexdec(substr($value, 0, 2)));
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$value = substr($value, 2);
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}
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return $result;
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}
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public function getContent()
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{
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return strtoupper($this->value);
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}
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public function getBinaryContent()
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{
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return $this->getEncodedValue();
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}
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public static function fromBinary(&$binaryData, &$offsetIndex = 0)
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{
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self::parseIdentifier($binaryData[$offsetIndex], Identifier::OCTETSTRING, $offsetIndex++);
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$contentLength = self::parseContentLength($binaryData, $offsetIndex);
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$value = substr($binaryData, $offsetIndex, $contentLength);
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$offsetIndex += $contentLength;
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$parsedObject = new self(bin2hex($value));
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$parsedObject->setContentLength($contentLength);
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return $parsedObject;
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}
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}
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