protected static function parseBinaryIdentifier($binaryData, &$offsetIndex)
{
if (strlen($binaryData) <= $offsetIndex) {
throw new ParserException('Can not parse identifier from data: Offset index larger than input size', $offsetIndex);
}
$identifier = $binaryData[$offsetIndex++];
if (IdentifierManager::isLongForm(ord($identifier)) == false) {
return $identifier;
}
while (true) {
if (strlen($binaryData) <= $offsetIndex) {
throw new ParserException('Can not parse identifier (long form) from data: Offset index larger than input size', $offsetIndex);
}
$nextOctet = $binaryData[$offsetIndex++];
$identifier .= $nextOctet;
if ((ord($nextOctet) & 0x80) === 0) {
// the most significant bit is 0 to we have reached the end of the identifier
break;
}
}
return $identifier;
}
/**
* @param int|string $identifier
*
* @return int
*/
public static function getTagNumber($identifier)
{
$firstOctet = substr($identifier, 0, 1);
if (!IdentifierManager::isLongForm($firstOctet)) {
return ord($firstOctet) & self::LONG_FORM;
}
$firstOctet = self::makeNumeric($identifier);
if (is_numeric($identifier)) {
$identifier = chr($identifier);
}
return Base128::decode(substr($identifier, 1));
}
