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<?php |
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|
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declare(strict_types=1); |
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|
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/* |
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* The MIT License (MIT) |
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* |
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* Copyright (c) 2018-2020 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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|
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namespace CBOR; |
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|
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use InvalidArgumentException; |
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use RuntimeException; |
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|
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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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|
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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 ($resource === false) { |
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throw new RuntimeException('Unable to open the memory'); |
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} |
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$result = fwrite($resource, $data); |
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if ($result === false) { |
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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 ($result === false) { |
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throw new RuntimeException('Unable to rewind the memory'); |
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} |
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$this->resource = $resource; |
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} |
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|
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public static function create(string $data): self |
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{ |
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return new self($data); |
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} |
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|
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public function read(int $length): string |
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{ |
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if ($length === 0) { |
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return ''; |
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} |
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|
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$alreadyRead = 0; |
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$data = ''; |
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while ($alreadyRead < $length) { |
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$left = $length - $alreadyRead; |
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$sizeToRead = $left < 1024 && $left > 0 ? $left : 1024; |
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$newData = fread($this->resource, $sizeToRead); |
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$alreadyRead += $sizeToRead; |
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|
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if ($newData === false) { |
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throw new RuntimeException('Unable to read the memory'); |
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} |
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if (mb_strlen($newData, '8bit') < $sizeToRead) { |
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throw new InvalidArgumentException(sprintf( |
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'Out of range. Expected: %d, read: %d.', |
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$length, |
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mb_strlen($data, '8bit') |
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)); |
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} |
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$data .= $newData; |
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} |
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|
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if (mb_strlen($data, '8bit') !== $length) { |
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throw new InvalidArgumentException(sprintf( |
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'Out of range. Expected: %d, read: %d.', |
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$length, |
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mb_strlen($data, '8bit') |
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)); |
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} |
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|
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return $data; |
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} |
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} |
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|
