mirror of
https://github.com/ramsey/uuid.git
synced 2026-06-24 17:35:57 +03:00
Ben Ramsey
99 lines
3.2 KiB
PHP
99 lines
3.2 KiB
PHP
<?php
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/**
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* This file is part of the ramsey/uuid library
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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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* @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
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* @license http://opensource.org/licenses/MIT MIT
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*/
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declare(strict_types=1);
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namespace Ramsey\Uuid;
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use Ramsey\Uuid\Rfc4122\Version;
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use function pack;
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use function substr;
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use function substr_replace;
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use function unpack;
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/**
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* Provides binary math utilities
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*/
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class BinaryUtils
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{
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/**
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* Applies the variant field to the 16-bit clock sequence
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*
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* @link https://www.rfc-editor.org/rfc/rfc9562#section-4.1 RFC 9562, 4.1. Variant Field
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*
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* @param int $clockSeq The 16-bit clock sequence value before the variant is applied
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*
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* @return int The 16-bit clock sequence multiplexed with the UUID variant
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*
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* @pure
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*/
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public static function applyVariant(int $clockSeq, Variant $variant = Variant::Rfc9562): int
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{
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return match ($variant) {
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Variant::ReservedNcs => $clockSeq & 0x7fff,
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Variant::Rfc9562 => $clockSeq & 0x3fff | 0x8000,
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Variant::ReservedMicrosoft => $clockSeq & 0x1fff | 0xc000,
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Variant::ReservedFuture => $clockSeq & 0x1fff | 0xe000,
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};
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}
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/**
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* Applies the version field to the 16-bit `time_hi_and_version` field
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*
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* @link https://www.rfc-editor.org/rfc/rfc9562#section-4.2 RFC 9562, 4.2. Version Field
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*
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* @param int $timeHi The value of the 16-bit `time_hi_and_version` field before the version is applied
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* @param Version $version The version to apply to the `time_hi` field
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*
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* @return int The 16-bit time_hi field of the timestamp multiplexed with the UUID version number
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*
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* @pure
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*/
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public static function applyVersion(int $timeHi, Version $version): int
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{
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return ($timeHi & 0x0fff) | ($version->value << 12);
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}
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/**
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* Applies the RFC 4122 version number and variant field to the 128-bit
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* integer (as a 16-byte string) provided
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*
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* @param non-empty-string $bytes A 128-bit integer (16-byte string) to
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* which the RFC 4122 version number and variant field will be applied,
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* making the number a valid UUID
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* @param Version $version The RFC 4122 version to apply
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*
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* @return non-empty-string A 16-byte string with the UUID version and variant applied
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*/
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public static function applyVersionAndVariant(
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string $bytes,
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Version $version,
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Variant $variant = Variant::Rfc9562,
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): string {
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/** @var int[] $unpackedTime */
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$unpackedTime = unpack('n*', substr($bytes, 6, 2));
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$timeHi = $unpackedTime[1];
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$timeHiAndVersion = pack('n*', self::applyVersion($timeHi, $version));
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/** @var int[] $unpackedClockSeq */
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$unpackedClockSeq = unpack('n*', substr($bytes, 8, 2));
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$clockSeqHi = $unpackedClockSeq[1];
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$clockSeqHiAndReserved = pack('n*', self::applyVariant($clockSeqHi, $variant));
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$bytes = substr_replace($bytes, $timeHiAndVersion, 6, 2);
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/** @var non-empty-string */
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return substr_replace($bytes, $clockSeqHiAndReserved, 8, 2);
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}
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}
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