59 lines
1.4 KiB
PHP
59 lines
1.4 KiB
PHP
<?php
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declare(strict_types=1);
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/*
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* The MIT License (MIT)
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*
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* Copyright (c) 2018 Spomky-Labs
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*
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* This software may be modified and distributed under the terms
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* of the MIT license. See the LICENSE file for details.
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*/
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namespace CBOR;
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use InvalidArgumentException;
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use RuntimeException;
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final class StringStream implements Stream
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{
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/**
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* @var resource
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*/
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private $resource;
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public function __construct(string $data)
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{
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$resource = fopen('php://memory', 'rb+');
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if (false === $resource) {
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throw new RuntimeException('Unable to open the memory');
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}
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$result = fwrite($resource, $data);
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if (false === $result) {
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throw new RuntimeException('Unable to write the memory');
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}
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$result = rewind($resource);
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if (false === $result) {
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throw new RuntimeException('Unable to rewind the memory');
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}
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$this->resource = $resource;
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}
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public function read(int $length): string
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{
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if (0 === $length) {
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return '';
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}
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$data = fread($this->resource, $length);
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if (false === $data) {
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throw new RuntimeException('Unable to read the memory');
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}
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if (mb_strlen($data, '8bit') !== $length) {
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throw new InvalidArgumentException(sprintf('Out of range. Expected: %d, read: %d.', $length, mb_strlen($data, '8bit')));
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}
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return $data;
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}
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}
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