[Summary view] [Print] [Text view]

   1  <?php
   2  
   3  declare(strict_types=1);
   4  
   5  /*
   6   * The MIT License (MIT)
   7   *
   8   * Copyright (c) 2014-2019 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 Webauthn;
  15  
  16  use Assert\Assertion;
  17  use CBOR\Stream;
  18  
  19  final class StringStream implements Stream
  20  {
  21      /**
  22       * @var resource
  23       */
  24      private $data;
  25  
  26      /**
  27       * @var int
  28       */
  29      private $length;
  30  
  31      /**
  32       * @var int
  33       */
  34      private $totalRead = 0;
  35  
  36      public function __construct(string $data)
  37      {
  38          $this->length = mb_strlen($data, '8bit');
  39          $resource = fopen('php://memory', 'rb+');
  40          Assertion::isResource($resource, 'Unable to open memory');
  41          $result = fwrite($resource, $data);
  42          Assertion::integer($result, 'Unable to write memory');
  43          $result = rewind($resource);
  44          Assertion::true($result, 'Unable to read memory');
  45          $this->data = $resource;
  46      }
  47  
  48      public function read(int $length): string
  49      {
  50          if (0 === $length) {
  51              return '';
  52          }
  53          $read = fread($this->data, $length);
  54          Assertion::string($read, 'Unable to read memory');
  55          $bytesRead = mb_strlen($read, '8bit');
  56          Assertion::length($read, $length, sprintf('Out of range. Expected: %d, read: %d.', $length, $bytesRead), null, '8bit');
  57          $this->totalRead += $bytesRead;
  58  
  59          return $read;
  60      }
  61  
  62      public function close(): void
  63      {
  64          $result = fclose($this->data);
  65          Assertion::true($result, 'Unable to close the memory');
  66      }
  67  
  68      public function isEOF(): bool
  69      {
  70          return $this->totalRead === $this->length;
  71      }
  72  }