protected function getEncodedValue()
{
$encodedValue = '';
foreach ($this->subIdentifiers as $subIdentifier) {
$encodedValue .= Base128::encode($subIdentifier);
}
return $encodedValue;
}
/**
* Creates an identifier. Short form identifiers are returned as integers
* for BC, long form identifiers will be returned as a string of octets.
*
* @param int $class
* @param bool $isConstructed
* @param int $tagNumber
*
* @throws Exception if the given arguments are invalid
*
* @return int|string
*/
public static function create($class, $isConstructed, $tagNumber)
{
if (!is_numeric($class) || $class < self::CLASS_UNIVERSAL || $class > self::CLASS_PRIVATE) {
throw new Exception(sprintf('Invalid class %d given', $class));
}
if (!is_bool($isConstructed)) {
throw new Exception("\$isConstructed must be a boolean value ({$isConstructed} given)");
}
$tagNumber = self::makeNumeric($tagNumber);
if ($tagNumber < 0) {
throw new Exception(sprintf('Invalid $tagNumber %d given. You can only use positive integers.', $tagNumber));
}
if ($tagNumber < self::LONG_FORM) {
return $class << 6 | $isConstructed << 5 | $tagNumber;
}
$firstOctet = $class << 6 | $isConstructed << 5 | self::LONG_FORM;
// Tag numbers formatted in long form are base-128 encoded. See X.609#8.1.2.4
return chr($firstOctet) . Base128::encode($tagNumber);
}
