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<?php namespace League\Flysystem\Util; class StreamHasher { /** * @var string */ private $algo; /** * StreamHasher constructor. * * @param string $algo */ public function __construct($algo) { $this->algo = $algo; } /** * @param resource $resource * * @return string */ public function hash($resource) { rewind($resource); $context = hash_init($this->algo); hash_update_stream($context, $resource); fclose($resource); return hash_final($context); } }