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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.
*/
namespace Symfony\Component\Cache\Marshaller;
/**
* A marshaller optimized for data structures generated by AbstractTagAwareAdapter.
*
* @author Nicolas Grekas <p@tchwork.com>
*/
class TagAwareMarshaller implements MarshallerInterface
{
private $marshaller;
public function __construct(MarshallerInterface $marshaller = null)
{
$this->marshaller = $marshaller ?? new DefaultMarshaller();
}
/**
* {@inheritdoc}
*/
public function marshall(array $values, ?array &$failed): array
{
$failed = $notSerialized = $serialized = [];
foreach ($values as $id => $value) {
if (\is_array($value) && \is_array($value['tags'] ?? null) && \array_key_exists('value', $value) && \count($value) === 2 + (\is_string($value['meta'] ?? null) && 8 === \strlen($value['meta']))) {
// if the value is an array with keys "tags", "value" and "meta", use a compact serialization format
// magic numbers in the form 9D-..-..-..-..-00-..-..-..-5F allow detecting this format quickly in unmarshall()
$v = $this->marshaller->marshall($value, $f);
if ($f) {
$f = [];
$failed[] = $id;
} else {
if ([] === $value['tags']) {
$v['tags'] = '';
}
$serialized[$id] = "\x9D".($value['meta'] ?? "\0\0\0\0\0\0\0\0").pack('N', \strlen($v['tags'])).$v['tags'].$v['value'];
$serialized[$id][9] = "\x5F";
}
} else {
// other arbitratry values are serialized using the decorated marshaller below
$notSerialized[$id] = $value;
}
}
if ($notSerialized) {
$serialized += $this->marshaller->marshall($notSerialized, $f);
$failed = array_merge($failed, $f);
}
return $serialized;
}
/**
* {@inheritdoc}
*/
public function unmarshall(string $value)
{
// detect the compact format used in marshall() using magic numbers in the form 9D-..-..-..-..-00-..-..-..-5F
if (13 >= \strlen($value) || "\x9D" !== $value[0] || "\0" !== $value[5] || "\x5F" !== $value[9]) {
return $this->marshaller->unmarshall($value);
}
// data consists of value, tags and metadata which we need to unpack
$meta = substr($value, 1, 12);
$meta[8] = "\0";
$tagLen = unpack('Nlen', $meta, 8)['len'];
$meta = substr($meta, 0, 8);
return [
'value' => $this->marshaller->unmarshall(substr($value, 13 + $tagLen)),
'tags' => $tagLen ? $this->marshaller->unmarshall(substr($value, 13, $tagLen)) : [],
'meta' => "\0\0\0\0\0\0\0\0" === $meta ? null : $meta,
];
}
}