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1<?php
2declare(strict_types=1);
3/**
4 * Pop PHP Framework (https://www.popphp.org/)
5 *
6 * @link       https://github.com/popphp/popphp-framework
7 * @author     Nick Sagona, III <nick@popphp.org>
8 * @copyright  Copyright (c) 2009-2026 Nick Sagona, III
9 * @license    https://www.popphp.org/license     New BSD License
10 */
11
12/**
13 * @namespace
14 */
15namespace Pop\Pdf\Extract;
16
17/**
18 * Pdf extract repair class
19 *
20 * @category   Pop
21 * @package    Pop\Pdf
22 * @author     Nick Sagona, III <nick@popphp.org>
23 * @copyright  Copyright (c) 2009-2026 Nick Sagona, III
24 * @license    https://www.popphp.org/license     New BSD License
25 * @version    6.0.0
26 */
27class Repair
28{
29
30    /**
31     * Scan raw PDF data for object offsets and a trailer, bypassing xref entirely
32     *
33     * @param  string $data
34     * @return array
35     */
36    public static function scan(string $data): array
37    {
38        $offsets = [];
39        $matches = [];
40
41        preg_match_all('/(?<![0-9])(\d+)[ \t\r\n]+(\d+)[ \t\r\n]+obj\b/', $data, $matches, PREG_OFFSET_CAPTURE);
42
43        foreach ($matches[1] as $i => $objMatch) {
44            $objNum = (int) $objMatch[0];
45            $offset = $matches[0][$i][1];
46            $offsets[$objNum] = ['offset' => $offset];
47        }
48
49        $trailer    = [];
50        $trailerPos = strrpos($data, 'trailer');
51
52        if ($trailerPos !== false) {
53            try {
54                $tokenizer = new Tokenizer($data, $trailerPos + strlen('trailer'));
55                $parser    = new ObjectParser($tokenizer);
56                $candidate = $parser->parseValue();
57                if (is_array($candidate)) {
58                    $trailer = $candidate;
59                }
60            } catch (Exception $e) {
61                // Malformed/truncated trailer dict - degrade to an empty
62                // trailer rather than losing the offsets already scanned.
63            }
64        }
65
66        return ['offsets' => $offsets, 'trailer' => $trailer];
67    }
68
69}