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<?php
declare(strict_types=1);
namespace SpomkyLabs\Pki\ASN1\Util;
use Brick\Math\BigInteger;
use InvalidArgumentException;
use Stringable;
use Throwable;
use function mb_strlen;
/**
* Class to wrap an integer of arbirtary length.
* @see \SpomkyLabs\Pki\Test\ASN1\Util\BigIntTest
*/
final class BigInt implements Stringable
{
/**
* Number as a BigInteger object.
*/
private readonly BigInteger $value;
/**
* Number as a base 10 integer string.
*
* @internal Lazily initialized
*/
private ?string $number = null;
/**
* Number as an integer type.
*
* @internal Lazily initialized
*/
private ?int $_intNum = null;
private function __construct(BigInteger|int|string $num)
{
// convert to BigInteger object
if (! $num instanceof BigInteger) {
try {
$num = BigInteger::of($num);
} catch (Throwable) {
throw new InvalidArgumentException('Unable to convert to integer.');
}
}
$this->value = $num;
}
public function __toString(): string
{
return $this->base10();
}
public static function create(BigInteger|int|string $num): self
{
return new self($num);
}
/**
* Initialize from an arbitrary length of octets as an unsigned integer.
*/
public static function fromUnsignedOctets(string $octets): self
{
if (mb_strlen($octets, '8bit') === 0) {
throw new InvalidArgumentException('Empty octets.');
}
return self::create(BigInteger::fromBytes($octets, false));
}
/**
* Initialize from an arbitrary length of octets as an signed integer having two's complement encoding.
*/
public static function fromSignedOctets(string $octets): self
{
if (mb_strlen($octets, '8bit') === 0) {
throw new InvalidArgumentException('Empty octets.');
}
return self::create(BigInteger::fromBytes($octets));
}
/**
* Get the number as a base 10 integer string.
*/
public function base10(): string
{
if ($this->number === null) {
$this->number = $this->value->toBase(10);
}
return $this->number;
}
/**
* Get the number as an integer.
*/
public function toInt(): int
{
if (! isset($this->_intNum)) {
$this->_intNum = $this->value->toInt();
}
return $this->_intNum;
}
public function getValue(): BigInteger
{
return $this->value;
}
/**
* Get the number as an unsigned integer encoded in binary.
*/
public function unsignedOctets(): string
{
return $this->value->toBytes(false);
}
/**
* Get the number as a signed integer encoded in two's complement binary.
*/
public function signedOctets(): string
{
return $this->value->toBytes();
}
}