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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Pdf\Core\File; |
| 6 | |
| 7 | use Phpdftk\Pdf\Core\PdfObject; |
| 8 | |
| 9 | /** |
| 10 | * Tracks all PdfObject instances and assigns sequential object numbers. |
| 11 | * |
| 12 | * Numbering starts at 1 because object 0 is reserved by the PDF spec as the |
| 13 | * free-list head in the cross-reference table (ISO 32000-2 section 7.5.4). Generation |
| 14 | * numbers are always 0 for objects in a new document -- non-zero generations |
| 15 | * only appear in incremental updates that reuse deleted object numbers. |
| 16 | */ |
| 17 | class ObjectRegistry |
| 18 | { |
| 19 | /** @var array<int, PdfObject> */ |
| 20 | private array $objects = []; |
| 21 | private int $nextObjectNumber = 1; |
| 22 | |
| 23 | /** |
| 24 | * Register a PdfObject, assign it an object number, and return that number. |
| 25 | */ |
| 26 | public function register(PdfObject $object): int |
| 27 | { |
| 28 | $objectNumber = $this->nextObjectNumber++; |
| 29 | $object->objectNumber = $objectNumber; |
| 30 | $object->generationNumber = 0; |
| 31 | $this->objects[$objectNumber] = $object; |
| 32 | return $objectNumber; |
| 33 | } |
| 34 | |
| 35 | /** |
| 36 | * Return all registered objects, keyed by object number. |
| 37 | * |
| 38 | * @return array<int, PdfObject> |
| 39 | */ |
| 40 | public function getAll(): array |
| 41 | { |
| 42 | return $this->objects; |
| 43 | } |
| 44 | |
| 45 | /** |
| 46 | * Return the total count of objects including the free list head (object 0). |
| 47 | */ |
| 48 | public function getSize(): int |
| 49 | { |
| 50 | return $this->nextObjectNumber; // includes object 0 |
| 51 | } |
| 52 | } |