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<?php |
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/* |
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* This file is part of ocubom/base-convert |
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* |
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* © Oscar Cubo Medina <https://ocubom.github.io> |
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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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namespace Ocubom\Math; |
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use Ocubom\Math\Base\Binary; |
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use Ocubom\Math\Base\Numeric; |
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use Ocubom\Math\Exception\InvalidArgumentException; |
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/** |
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* Base convert. |
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* |
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* @author Oscar Cubo Medina <[email protected]> |
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*/ |
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abstract class Base |
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{ |
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/** @var class-string[] */ |
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private static $bases = [ |
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'bin' => Binary::class, |
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'binary' => Binary::class, |
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]; |
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/** |
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* Convert a number between arbitrary bases. |
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* |
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* Supports large arbitrary numbers by using a safe php implementation |
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* |
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* @see http://php.net/manual/en/function.base-convert.php |
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* @see http://php.net/manual/en/function.base-convert.php#109660 |
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* |
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* @param int|string $number The number to convert |
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* @param BaseInterface|int|string $source Original base for number |
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* @param BaseInterface|int|string $target Desired base for number |
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*/ |
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final public static function convert($number, $source, $target): string |
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{ |
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// Filter bases |
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$source = self::filterBase($source); |
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$target = self::filterBase($target); |
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if ($source == $target) { |
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return (is_numeric($number) ? strval($number) : $number) ?: '0'; |
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} |
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// Filter number with source base |
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$number = $source->filterValue($number); |
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// Do base conversions |
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$number = self::fromBase($number, $source->getMap()); |
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$number = self::toBase($number, $target->getMap()); |
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// Prepare the final value |
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return $target->returnValue($number); |
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} |
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/** |
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* Filter & validate base. |
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* |
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* @param BaseInterface|string|int $base |
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*/ |
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final public static function filterBase($base): BaseInterface |
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{ |
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if ($base instanceof BaseInterface) { |
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return $base; |
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} |
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if ($class = self::$bases[strtolower((string) $base)] ?? null) { |
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try { |
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$object = (new \ReflectionClass($class))->newInstance(); |
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if ($object instanceof BaseInterface) { |
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return $object; |
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} |
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} catch (\ReflectionException $exc) { // @codeCoverageIgnore |
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throw new InvalidArgumentException("Invalid base ({$base})", 0, $exc); // @codeCoverageIgnore |
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} |
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} |
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return new Numeric((string) $base); |
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} |
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/** |
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* The following method was extracted from symfony/uid (v7.0.1). |
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* |
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* Code subject to the MIT license (https://github.com/symfony/symfony/blob/v7.0.1/src/Symfony/Component/Uid/LICENSE) |
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* |
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* Copyright (c) 2020-2022 Fabien Potencier |
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* |
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* @see https://github.com/symfony/symfony/blob/v7.0.1/src/Symfony/Component/Uid/BinaryUtil.php#L74 |
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*/ |
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public static function fromBase(string $digits, array $map): string |
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{ |
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$base = \strlen($map['']); |
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$count = \strlen($digits); |
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$bytes = []; |
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while ($count) { |
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$quotient = []; |
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$remainder = 0; |
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for ($i = 0; $i !== $count; ++$i) { |
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$carry = ($bytes ? $digits[$i] : $map[$digits[$i]]) + $remainder * $base; |
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if (\PHP_INT_SIZE >= 8) { |
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$digit = $carry >> 16; |
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$remainder = $carry & 0xFFFF; |
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} else { |
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$digit = $carry >> 8; |
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$remainder = $carry & 0xFF; |
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} |
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if ($digit || $quotient) { |
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$quotient[] = $digit; |
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} |
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} |
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$bytes[] = $remainder; |
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$count = \count($digits = $quotient); |
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} |
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return pack(\PHP_INT_SIZE >= 8 ? 'n*' : 'C*', ...array_reverse($bytes)); |
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} |
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/** |
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* The following method was extracted from symfony/uid (v7.0.1). |
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* |
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* Code subject to the MIT license (https://github.com/symfony/symfony/blob/v7.0.1/src/Symfony/Component/Uid/LICENSE) |
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* |
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* Copyright (c) 2020-2022 Fabien Potencier |
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* |
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* @see https://github.com/symfony/symfony/blob/v7.0.1/src/Symfony/Component/Uid/BinaryUtil.php#L47 |
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*/ |
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public static function toBase(string $bytes, array $map): string |
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{ |
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$base = \strlen($alphabet = $map['']); |
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$bytes = array_values(unpack(\PHP_INT_SIZE >= 8 ? 'n*' : 'C*', $bytes)); |
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$digits = ''; |
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while ($count = \count($bytes)) { |
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$quotient = []; |
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$remainder = 0; |
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for ($i = 0; $i !== $count; ++$i) { |
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$carry = $bytes[$i] + ($remainder << (\PHP_INT_SIZE >= 8 ? 16 : 8)); |
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$digit = intdiv($carry, $base); |
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$remainder = $carry % $base; |
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if ($digit || $quotient) { |
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$quotient[] = $digit; |
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} |
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} |
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$digits = $alphabet[$remainder].$digits; |
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$bytes = $quotient; |
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} |
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return $digits; |
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} |
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} |
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ocubom /
base-convert
