Proyectos de Subversion Moodle

Rev

| Ultima modificación | Ver Log |

Rev Autor Línea Nro. Línea
1 efrain 1 
<?php
2 
 
3 
/**
4 
 * This file is part of FPDI
5 
 *
6 
 * @package   setasign\Fpdi
7 
 * @copyright Copyright (c) 2023 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 
}