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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Pdf\Reader\Parser; |
| 6 | |
| 7 | /** |
| 8 | * Parsed page offset hint table — ISO 32000-2 §F.4.1. |
| 9 | * |
| 10 | * Contains the header values (minimums and bit widths) and per-page entries |
| 11 | * for computing byte ranges of individual pages in a linearized PDF. |
| 12 | */ |
| 13 | final class PageOffsetHintTable |
| 14 | { |
| 15 | /** |
| 16 | * @param list<PageHintEntry> $entries |
| 17 | */ |
| 18 | public function __construct( |
| 19 | public readonly int $minObjectsPerPage, |
| 20 | public readonly int $firstPageLocation, |
| 21 | public readonly int $minPageLength, |
| 22 | public readonly int $minSharedRefsPerPage, |
| 23 | public readonly int $minSharedObjId, |
| 24 | public readonly int $minContentStreamOffset, |
| 25 | public readonly int $minContentStreamLength, |
| 26 | public readonly array $entries, |
| 27 | ) {} |
| 28 | |
| 29 | /** |
| 30 | * Compute the byte offset and length for a page (0-indexed). |
| 31 | * |
| 32 | * @return array{offset: int, length: int} |
| 33 | */ |
| 34 | public function getPageByteRange(int $pageIndex): array |
| 35 | { |
| 36 | if ($pageIndex < 0 || $pageIndex >= count($this->entries)) { |
| 37 | throw new \OutOfRangeException("Page index {$pageIndex} out of range"); |
| 38 | } |
| 39 | |
| 40 | // For the first page (index 0), the location is the firstPageLocation |
| 41 | // For subsequent pages, we sum up lengths starting from after firstPageEnd |
| 42 | if ($pageIndex === 0) { |
| 43 | $length = $this->minPageLength + $this->entries[0]->pageLengthDelta; |
| 44 | return ['offset' => $this->firstPageLocation, 'length' => $length]; |
| 45 | } |
| 46 | |
| 47 | // Pages after the first are sequential in the file, starting after |
| 48 | // the first-page section. Their offsets are cumulative. |
| 49 | $offset = 0; |
| 50 | for ($i = 1; $i < $pageIndex; $i++) { |
| 51 | $offset += $this->minPageLength + $this->entries[$i]->pageLengthDelta; |
| 52 | } |
| 53 | |
| 54 | $length = $this->minPageLength + $this->entries[$pageIndex]->pageLengthDelta; |
| 55 | |
| 56 | return ['offset' => $offset, 'length' => $length]; |
| 57 | } |
| 58 | } |