<?php
declare(strict_types=1);
/*
* The MIT License (MIT)
*
* Copyright (c) 2014-2021 Spomky-Labs
*
* This software may be modified and distributed under the terms
* of the MIT license. See the LICENSE file for details.
*/
namespace Webauthn;
use Assert\Assertion;
use CBOR\Stream;
use function Safe\fclose;
use function Safe\fopen;
use function Safe\fread;
use function Safe\fwrite;
use function Safe\rewind;
use function Safe\sprintf;
final class StringStream implements Stream
{
/**
* @var resource
*/
private $data;
/**
* @var int
*/
private $length;
/**
* @var int
*/
private $totalRead = 0;
public function __construct(string $data)
{
$this->length = mb_strlen($data, '8bit');
$resource = fopen('php://memory', 'rb+');
fwrite($resource, $data);
rewind($resource);
$this->data = $resource;
}
public function read(int $length): string
{
if (0 === $length) {
return '';
}
$read = fread($this->data, $length);
$bytesRead = mb_strlen($read, '8bit');
Assertion::length($read, $length, sprintf('Out of range. Expected: %d, read: %d.', $length, $bytesRead), null, '8bit');
$this->totalRead += $bytesRead;
return $read;
}
public function close(): void
{
fclose($this->data);
}
public function isEOF(): bool
{
return $this->totalRead === $this->length;
}
}