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<?php |
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declare(strict_types = 1); |
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namespace Sop\ASN1\Type\Primitive; |
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use Sop\ASN1\Component\Identifier; |
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use Sop\ASN1\Component\Length; |
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use Sop\ASN1\Element; |
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use Sop\ASN1\Feature\ElementBase; |
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use Sop\ASN1\Type\PrimitiveType; |
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use Sop\ASN1\Type\UniversalClass; |
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use Sop\ASN1\Util\BigInt; |
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/** |
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* Implements *INTEGER* type. |
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*/ |
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class Integer extends Element |
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{ |
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use UniversalClass; |
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use PrimitiveType; |
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/** |
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* The number. |
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* |
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* @var BigInt |
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*/ |
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private $_number; |
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/** |
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* Constructor. |
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* |
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* @param \GMP|int|string $number Base 10 integer |
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*/ |
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public function __construct($number) |
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{ |
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$this->_typeTag = self::TYPE_INTEGER; |
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if (!self::_validateNumber($number)) { |
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$var = is_scalar($number) ? strval($number) : gettype($number); |
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throw new \InvalidArgumentException("'{$var}' is not a valid number."); |
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} |
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$this->_number = new BigInt($number); |
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} |
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/** |
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* Get the number as a base 10. |
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* |
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* @return string Integer as a string |
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*/ |
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public function number(): string |
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{ |
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return $this->_number->base10(); |
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} |
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/** |
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* Get the number as an integer type. |
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*/ |
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public function intNumber(): int |
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{ |
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return $this->_number->intVal(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function _encodedContentDER(): string |
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{ |
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return $this->_number->signedOctets(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected static function _decodeFromDER(Identifier $identifier, |
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string $data, int &$offset): ElementBase |
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{ |
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$idx = $offset; |
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$length = Length::expectFromDER($data, $idx)->intLength(); |
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$bytes = substr($data, $idx, $length); |
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$idx += $length; |
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$num = BigInt::fromSignedOctets($bytes)->gmpObj(); |
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$offset = $idx; |
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// late static binding since enumerated extends integer type |
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return new static($num); |
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} |
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/** |
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* Test that number is valid for this context. |
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* |
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* @param mixed $num |
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*/ |
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private static function _validateNumber($num): bool |
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{ |
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if (is_int($num)) { |
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return true; |
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} |
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if (is_string($num) && preg_match('/-?\d+/', $num)) { |
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return true; |
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} |
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if ($num instanceof \GMP) { |
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return true; |
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} |
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return false; |
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} |
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} |
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sop /
asn1
