[Summary view]

Differences Between: [Versions 310 and 401] [Versions 39 and 401]

   1  <?php
   2  
   3  /**
   4   * This file is part of FPDI
   5   *
   6   * @package   setasign\Fpdi
   7   * @copyright Copyright (c) 2020 Setasign GmbH & Co. KG (https://www.setasign.com)
   8   * @license   http://opensource.org/licenses/mit-license The MIT License
   9   */
  10  
  11  namespace setasign\Fpdi\PdfParser\CrossReference;
  12  
  13  use setasign\Fpdi\PdfParser\PdfParser;
  14  use setasign\Fpdi\PdfParser\Type\PdfDictionary;
  15  use setasign\Fpdi\PdfParser\Type\PdfToken;
  16  use setasign\Fpdi\PdfParser\Type\PdfTypeException;
  17  
  18  /**
  19   * Abstract class for cross-reference reader classes.
  20   */
  21  abstract class AbstractReader
  22  {
  23      /**
  24       * @var PdfParser
  25       */
  26      protected $parser;
  27  
  28      /**
  29       * @var PdfDictionary
  30       */
  31      protected $trailer;
  32  
  33      /**
  34       * AbstractReader constructor.
  35       *
  36       * @param PdfParser $parser
  37       * @throws CrossReferenceException
  38       * @throws PdfTypeException
  39       */
  40      public function __construct(PdfParser $parser)
  41      {
  42          $this->parser = $parser;
  43          $this->readTrailer();
  44      }
  45  
  46      /**
  47       * Get the trailer dictionary.
  48       *
  49       * @return PdfDictionary
  50       */
  51      public function getTrailer()
  52      {
  53          return $this->trailer;
  54      }
  55  
  56      /**
  57       * Read the trailer dictionary.
  58       *
  59       * @throws CrossReferenceException
  60       * @throws PdfTypeException
  61       */
  62      protected function readTrailer()
  63      {
  64          try {
  65              $trailerKeyword = $this->parser->readValue(null, PdfToken::class);
  66              if ($trailerKeyword->value !== 'trailer') {
  67                  throw new CrossReferenceException(
  68                      \sprintf(
  69                          'Unexpected end of cross reference. "trailer"-keyword expected, got: %s.',
  70                          $trailerKeyword->value
  71                      ),
  72                      CrossReferenceException::UNEXPECTED_END
  73                  );
  74              }
  75          } catch (PdfTypeException $e) {
  76              throw new CrossReferenceException(
  77                  'Unexpected end of cross reference. "trailer"-keyword expected, got an invalid object type.',
  78                  CrossReferenceException::UNEXPECTED_END,
  79                  $e
  80              );
  81          }
  82  
  83          try {
  84              $trailer = $this->parser->readValue(null, PdfDictionary::class);
  85          } catch (PdfTypeException $e) {
  86              throw new CrossReferenceException(
  87                  'Unexpected end of cross reference. Trailer not found.',
  88                  CrossReferenceException::UNEXPECTED_END,
  89                  $e
  90              );
  91          }
  92  
  93          $this->trailer = $trailer;
  94      }
  95  }