StreamHasher.php

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<?php

namespace League\Flysystem\Util;

class StreamHasher
{
    private $algo;

    public function __construct($algo)
    {
        $this->algo = $algo;
    }

    public function hash($resource)
    {
        rewind($resource);
        $context = hash_init($this->algo);
        hash_update_stream($context, $resource);
        fclose($resource);

        return hash_final($context);
    }
}