<?php
declare(strict_types=1);
namespace GuzzleHttp\Psr7;
use Psr\Http\Message\StreamInterface;
/**
* Provides a buffer stream that can be written to to fill a buffer, and read
* from to remove bytes from the buffer.
*
* This stream returns a "hwm" metadata value that tells upstream consumers
* what the configured high water mark of the stream is, or the maximum
* preferred size of the buffer.
*/
final class BufferStream implements StreamInterface
{
/** @var int */
private $hwm;
/** @var string */
private $buffer = '';
/**
* @param int $hwm High water mark, representing the preferred maximum
* buffer size. If the size of the buffer exceeds the high
* water mark, then calls to write will continue to succeed
* but will return 0 to inform writers to slow down
* until the buffer has been drained by reading from it.
*/
public function __construct(int $hwm = 16384)
{
$this->hwm = $hwm;
}
public function __toString(): string
{
return $this->getContents();
}
public function getContents(): string
{
$buffer = $this->buffer;
$this->buffer = '';
 
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