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<?php
declare(strict_types=1);
namespace BigintTest;
use OverflowException;
use PHPUnit\Framework\TestCase;
use ZipStream\Bigint;
class BigintTest extends TestCase
{
public function testConstruct(): void
{
$bigint = new Bigint(0x12345678);
$this->assertSame('0x0000000012345678', $bigint->getHex64());
$this->assertSame(0x12345678, $bigint->getLow32());
$this->assertSame(0, $bigint->getHigh32());
}
public function testConstructLarge(): void
{
$bigint = new Bigint(0x87654321);
$this->assertSame('0x0000000087654321', $bigint->getHex64());
$this->assertSame('87654321', bin2hex(pack('N', $bigint->getLow32())));
$this->assertSame(0, $bigint->getHigh32());
}
public function testAddSmallValue(): void
{
$bigint = new Bigint(1);
$bigint = $bigint->add(Bigint::init(2));
$this->assertSame(3, $bigint->getLow32());
$this->assertFalse($bigint->isOver32());
$this->assertTrue($bigint->isOver32(true));
$this->assertSame($bigint->getLowFF(), (float)$bigint->getLow32());
$this->assertSame($bigint->getLowFF(true), (float)0xFFFFFFFF);
}
public function testAddWithOverflowAtLowestByte(): void
{
$bigint = new Bigint(0xFF);
$bigint = $bigint->add(Bigint::init(0x01));
$this->assertSame(0x100, $bigint->getLow32());
}
public function testAddWithOverflowAtInteger32(): void
{
$bigint = new Bigint(0xFFFFFFFE);
$this->assertFalse($bigint->isOver32());
$bigint = $bigint->add(Bigint::init(0x01));
$this->assertTrue($bigint->isOver32());
$bigint = $bigint->add(Bigint::init(0x01));
$this->assertSame('0x0000000100000000', $bigint->getHex64());
$this->assertTrue($bigint->isOver32());
$this->assertSame((float)0xFFFFFFFF, $bigint->getLowFF());
}
public function testAddWithOverflowAtInteger64(): void
{
$bigint = Bigint::fromLowHigh(0xFFFFFFFF, 0xFFFFFFFF);
$this->assertSame('0xFFFFFFFFFFFFFFFF', $bigint->getHex64());
$this->expectException(OverflowException::class);
$bigint->add(Bigint::init(1));
}
}