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