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<?php |
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declare(strict_types = 1); |
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namespace Sop\ASN1\Util; |
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/** |
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* Class to wrap an integer of arbirtary length. |
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*/ |
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class BigInt |
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{ |
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/** |
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* Number as a base10 integer string. |
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* |
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* @var string |
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*/ |
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private $_num; |
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/** |
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* Number as an integer type. |
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* |
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* @internal Lazily initialized |
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* |
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* @var null|int |
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*/ |
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private $_intNum; |
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/** |
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* Constructor. |
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* |
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* @param int|string $num |
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*/ |
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public function __construct($num) |
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{ |
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$this->_num = strval($num); |
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} |
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/** |
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* @return string |
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*/ |
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1 |
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public function __toString() |
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{ |
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1 |
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return $this->base10(); |
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} |
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/** |
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* Get the number as a base10 integer string. |
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* |
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* @return string |
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*/ |
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public function base10(): string |
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{ |
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return $this->_num; |
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} |
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/** |
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* Get the number as an integer. |
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* |
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* @throws \RuntimeException If number overflows integer size |
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* |
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* @return int |
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*/ |
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public function intVal(): int |
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{ |
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if (!isset($this->_intNum)) { |
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$num = gmp_init($this->_num, 10); |
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if (gmp_cmp($num, $this->_intMaxGmp()) > 0) { |
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throw new \RuntimeException('Integer overflow.'); |
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} |
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if (gmp_cmp($num, $this->_intMinGmp()) < 0) { |
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throw new \RuntimeException('Integer underflow.'); |
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} |
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$this->_intNum = gmp_intval($num); |
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} |
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return $this->_intNum; |
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} |
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/** |
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* Get the number as a GMP object. |
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* |
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* @return \GMP |
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*/ |
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public function gmpObj(): \GMP |
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{ |
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return gmp_init($this->_num, 10); |
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} |
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/** |
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* Get the maximum integer value. |
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* |
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* @return \GMP |
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*/ |
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private function _intMaxGmp(): \GMP |
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{ |
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static $gmp; |
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if (!isset($gmp)) { |
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$gmp = gmp_init(PHP_INT_MAX, 10); |
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} |
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return $gmp; |
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} |
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/** |
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* Get the minimum integer value. |
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* |
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* @return \GMP |
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*/ |
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private function _intMinGmp(): \GMP |
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{ |
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static $gmp; |
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if (!isset($gmp)) { |
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$gmp = gmp_init(PHP_INT_MIN, 10); |
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} |
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return $gmp; |
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} |
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} |
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sop /
asn1
