# media-cloud-sync/1.2.2/includes/sdk/s3/Aws/HashingStream.php

Media Cloud Sync, version 1.2.2. 51 lines.

- Page: https://pluginprobe.com/plugins/media-cloud-sync/1.2.2/code/includes/sdk/s3/Aws/HashingStream.php
- Raw: https://pluginprobe.com/plugins/media-cloud-sync/1.2.2/raw/includes/sdk/s3/Aws/HashingStream.php
- Modified: 2024-10-27T10:40:38+00:00

Line numbers below start at 1. Link to a line or a range by appending a fragment to the
page URL, for example `https://pluginprobe.com/plugins/media-cloud-sync/1.2.2/code/includes/sdk/s3/Aws/HashingStream.php#L10-L20`.

```php
<?php

namespace Dudlewebs\WPMCS\s3\Aws;

use Dudlewebs\WPMCS\s3\GuzzleHttp\Psr7\StreamDecoratorTrait;
use Dudlewebs\WPMCS\s3\Psr\Http\Message\StreamInterface;
/**
 * Stream decorator that calculates a rolling hash of the stream as it is read.
 */
class HashingStream implements StreamInterface
{
    use StreamDecoratorTrait;
    /** @var HashInterface */
    private $hash;
    /** @var callable|null */
    private $callback;
    /**
     * @param StreamInterface $stream     Stream that is being read.
     * @param HashInterface   $hash       Hash used to calculate checksum.
     * @param callable        $onComplete Optional function invoked when the
     *                                    hash calculation is completed.
     */
    public function __construct(StreamInterface $stream, HashInterface $hash, callable $onComplete = null)
    {
        $this->stream = $stream;
        $this->hash = $hash;
        $this->callback = $onComplete;
    }
    public function read($length)
    {
        $data = $this->stream->read($length);
        $this->hash->update($data);
        if ($this->eof()) {
            $result = $this->hash->complete();
            if ($this->callback) {
                \call_user_func($this->callback, $result);
            }
        }
        return $data;
    }
    public function seek($offset, $whence = \SEEK_SET)
    {
        if ($offset === 0) {
            $this->hash->reset();
            return $this->stream->seek($offset);
        }
        // Seeking arbitrarily is not supported.
        return \false;
    }
}

```