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<?php
/**
* SPDX-FileCopyrightText: 2019 Roeland Jago Douma <roeland@famdouma.nl>
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace Icewind\Streams;
abstract class HashWrapper extends Wrapper {
/**
* @var callable|null
*/
private $callback;
/**
* @var resource|\HashContext
*/
private $hashContext;
/**
* Wraps a stream to make it seekable
*
* @param resource $source
* @param string $hash
* @param callable $callback
* @return resource|false
*
* @throws \BadMethodCallException
*/
public static function wrap($source, $hash, $callback) {
$context = [
'hash' => $hash,
'callback' => $callback,
];
return self::wrapSource($source, $context);
}
public function dir_opendir($path, $options) {
return false;
}
public function stream_open($path, $mode, $options, &$opened_path) {
$context = $this->loadContext();
$this->callback = $context['callback'];
$this->hashContext = hash_init($context['hash']);
return true;
}
protected function updateHash($data) {
hash_update($this->hashContext, $data);
}
public function stream_close() {
$hash = hash_final($this->hashContext);
if ($this->hashContext !== false && is_callable($this->callback)) {
call_user_func($this->callback, $hash);
}
return parent::stream_close();
}
}
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