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