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<?php |
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/** |
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* This file is part of the reliforp/reli-prof package. |
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* |
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* (c) sji <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace Reli\Lib\Integer; |
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use function decbin; |
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use function max; |
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use function pack; |
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use function str_pad; |
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use function strlen; |
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use function strrev; |
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use function unpack; |
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final class UInt64 |
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{ |
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public string $packed_value; |
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public function __construct( |
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public int $hi, |
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public int $lo |
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) { |
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$this->packed_value = $this->pack($hi, $lo); |
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} |
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private function pack(int $hi, int $lo): string |
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{ |
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return pack('ll', $lo, $hi); |
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} |
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public function __toString(): string |
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{ |
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return $this->toString(); |
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} |
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private function addDigitsViaString(string $a, string $b): string |
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{ |
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$result = ''; |
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$carry = 0; |
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$a = strrev($a); |
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$b = strrev($b); |
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$max_len = max(strlen($a), strlen($b)); |
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for ($i = 0; $i < $max_len; $i++) { |
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$digit_a = (int)($a[$i] ?? 0); |
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$digit_b = (int)($b[$i] ?? 0); |
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$sum = $digit_a + $digit_b + $carry; |
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$carry = (int)($sum >= 10); |
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$result .= $sum % 10; |
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} |
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if ($carry) { |
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$result .= '1'; |
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} |
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return strrev($result); |
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} |
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private function twosComplementToUnsigned(string $binary_string): string |
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{ |
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$binary_string = strrev($binary_string); |
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$result = '0'; |
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$addend = '1'; |
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for ($i = 0; $i < strlen($binary_string); $i++) { |
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if ($binary_string[$i] === '1') { |
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$result = $this->addDigitsViaString($result, $addend); |
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} |
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$addend = $this->addDigitsViaString($addend, $addend); |
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} |
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return $result; |
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} |
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private function toString(): string |
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{ |
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$int = $this->toInt(); |
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$binary_string = decbin($int); |
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if ($int >= 0) { |
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$binary_string = str_pad($binary_string, 64, '0', STR_PAD_LEFT); |
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} |
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return $this->twosComplementToUnsigned($binary_string); |
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} |
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public function toInt(): int |
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{ |
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$result = unpack('Presult', $this->packed_value); |
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if ($result === false) { |
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throw new \LogicException('unpack failed'); |
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} |
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return (int)$result['result']; |
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} |
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public function checkBitSet(int $bit_pos): bool |
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{ |
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if ($bit_pos >= 32) { |
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$bit_pos -= 32; |
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return (bool)($this->hi & (1 << $bit_pos)); |
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} |
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return (bool)($this->lo & (1 << $bit_pos)); |
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} |
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} |
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reliforp /
reli-prof
