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<?php
namespace Amp\Serialization;
final class CompressingSerializer implements Serializer
{
private const FLAG_COMPRESSED = 1;
private const COMPRESSION_THRESHOLD = 256;
/** @var Serializer */
private $serializer;
public function __construct(Serializer $serializer)
{
$this->serializer = $serializer;
}
public function serialize($data): string
{
$serializedData = $this->serializer->serialize($data);
$flags = 0;
if (\strlen($serializedData) > self::COMPRESSION_THRESHOLD) {
$serializedData = @\gzdeflate($serializedData, 1);
if ($serializedData === false) {
$error = \error_get_last();
throw new SerializationException('Could not compress data: ' . ($error['message'] ?? 'unknown error'));
}
$flags |= self::FLAG_COMPRESSED;
}
return \chr($flags & 0xff) . $serializedData;
}
public function unserialize(string $data)
{
$firstByte = \ord($data[0]);
$data = \substr($data, 1);
if ($firstByte & self::FLAG_COMPRESSED) {
$data = @\gzinflate($data);
if ($data === false) {
$error = \error_get_last();
throw new SerializationException('Could not decompress data: ' . ($error['message'] ?? 'unknown error'));
}
}
return $this->serializer->unserialize($data);
}
}