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   1  <?php
   2  
   3  declare(strict_types=1);
   4  
   5  /*
   6   * The MIT License (MIT)
   7   *
   8   * Copyright (c) 2018-2020 Spomky-Labs
   9   *
  10   * This software may be modified and distributed under the terms
  11   * of the MIT license.  See the LICENSE file for details.
  12   */
  13  
  14  namespace CBOR;
  15  
  16  use InvalidArgumentException;
  17  use RuntimeException;
  18  
  19  final class StringStream implements Stream
  20  {
  21      /**
  22       * @var resource
  23       */
  24      private $resource;
  25  
  26      public function __construct(string $data)
  27      {
  28          $resource = fopen('php://memory', 'rb+');
  29          if (false === $resource) {
  30              throw new RuntimeException('Unable to open the memory');
  31          }
  32          $result = fwrite($resource, $data);
  33          if (false === $result) {
  34              throw new RuntimeException('Unable to write the memory');
  35          }
  36          $result = rewind($resource);
  37          if (false === $result) {
  38              throw new RuntimeException('Unable to rewind the memory');
  39          }
  40          $this->resource = $resource;
  41      }
  42  
  43      public function read(int $length): string
  44      {
  45          if (0 === $length) {
  46              return '';
  47          }
  48          $data = fread($this->resource, $length);
  49          if (false === $data) {
  50              throw new RuntimeException('Unable to read the memory');
  51          }
  52          if (mb_strlen($data, '8bit') !== $length) {
  53              throw new InvalidArgumentException(sprintf('Out of range. Expected: %d, read: %d.', $length, mb_strlen($data, '8bit')));
  54          }
  55  
  56          return $data;
  57      }
  58  }