69 lines
1.3 KiB
PHP
69 lines
1.3 KiB
PHP
<?php
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declare(strict_types=1);
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namespace PhpMyAdmin\WebAuthn;
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use function fopen;
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use function fread;
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use function ftell;
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use function fwrite;
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use function rewind;
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final class DataStream
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{
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/** @var resource */
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private $stream;
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/**
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* @throws WebAuthnException
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*/
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public function __construct(string $binaryString)
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{
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$resource = fopen('php://memory', 'rb+');
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if ($resource === false || fwrite($resource, $binaryString) === false) {
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throw new WebAuthnException();
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}
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if (! rewind($resource)) {
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throw new WebAuthnException();
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}
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$this->stream = $resource;
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}
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/**
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* @throws WebAuthnException
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*/
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public function take(int $length): string
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{
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if ($length < 0) {
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throw new WebAuthnException();
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}
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if ($length === 0) {
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return '';
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}
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$string = fread($this->stream, $length);
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if ($string === false) {
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throw new WebAuthnException();
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}
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return $string;
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}
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/**
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* @throws WebAuthnException
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*/
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public function getPosition(): int
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{
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$position = ftell($this->stream);
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if ($position === false) {
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throw new WebAuthnException();
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}
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return $position;
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}
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}
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