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<?php
declare(strict_types=1);
namespace GuzzleHttp\Psr7;
use Psr\Http\Message\StreamInterface;
/**
* Stream decorator that begins dropping data once the size of the underlying
* stream becomes too full.
*/
final class DroppingStream implements StreamInterface
{
use StreamDecoratorTrait;
/** @var int */
private $maxLength;
/** @var StreamInterface */
private $stream;
/**
* @param StreamInterface $stream Underlying stream to decorate.
* @param int $maxLength Maximum size before dropping data.
*/
public function __construct(StreamInterface $stream, int $maxLength)
{
$this->stream = $stream;
$this->maxLength = $maxLength;
}
public function write($string): int
{
$diff = $this->maxLength - $this->stream->getSize();
// Begin returning 0 when the underlying stream is too large.
if ($diff <= 0) {
return 0;
}
// Write the stream or a subset of the stream if needed.
if (strlen($string) < $diff) {
return $this->stream->write($string);
}
return $this->stream->write(substr($string, 0, $diff));
}
}
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