name : CalculateChecksumFromStream.php <?php declare(strict_types=1); namespace League\Flysystem; use function hash_final; use function hash_init; use function hash_update_stream; trait CalculateChecksumFromStream { private function calculateChecksumFromStream(string $path, Config $config): string { try { $stream = $this->readStream($path); $algo = (string) $config->get('checksum_algo', 'md5'); $context = hash_init($algo); hash_update_stream($context, $stream); return hash_final($context); } catch (FilesystemException $exception) { throw new UnableToProvideChecksum($exception->getMessage(), $path, $exception); } } /** * @return resource */ abstract public function readStream(string $path); }