82 lines
2.1 KiB
PHP
82 lines
2.1 KiB
PHP
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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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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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/**
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* A short namespace-less class to serialize items with metadata.
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*
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* @author Nicolas Grekas <p@tchwork.com>
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*
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* @internal
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*/
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class <EFBFBD>
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{
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private const EXPIRY_OFFSET = 1648206727;
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private const INT32_MAX = 2147483647;
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public readonly mixed $value;
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public readonly array $metadata;
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public function __construct(mixed $value, array $metadata)
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{
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$this->value = $value;
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$this->metadata = $metadata;
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}
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public function __serialize(): array
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{
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// pack 31-bits ctime into 14bits
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$c = $this->metadata['ctime'] ?? 0;
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$c = match (true) {
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$c > self::INT32_MAX - 2 => self::INT32_MAX,
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$c > 0 => 1 + $c,
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default => 1,
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};
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$e = 0;
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while (!(0x40000000 & $c)) {
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$c <<= 1;
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++$e;
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}
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$c = (0x7FE0 & ($c >> 16)) | $e;
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$pack = pack('Vn', (int) (0.1 + ($this->metadata['expiry'] ?: self::INT32_MAX + self::EXPIRY_OFFSET) - self::EXPIRY_OFFSET), $c);
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if (isset($this->metadata['tags'])) {
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$pack[4] = $pack[4] | "\x80";
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}
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return [$pack => $this->value] + ($this->metadata['tags'] ?? []);
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}
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public function __unserialize(array $data): void
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{
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$pack = array_key_first($data);
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$this->value = $data[$pack];
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if ($hasTags = "\x80" === ($pack[4] & "\x80")) {
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unset($data[$pack]);
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$pack[4] = $pack[4] & "\x7F";
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}
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$metadata = unpack('Vexpiry/nctime', $pack);
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$metadata['expiry'] += self::EXPIRY_OFFSET;
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if (!$metadata['ctime'] = ((0x4000 | $metadata['ctime']) << 16 >> (0x1F & $metadata['ctime'])) - 1) {
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unset($metadata['ctime']);
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}
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if ($hasTags) {
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$metadata['tags'] = $data;
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}
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$this->metadata = $metadata;
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}
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}
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