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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Pdf\Core\Document; |
| 6 | |
| 7 | use Phpdftk\Pdf\Core\PdfDictionary; |
| 8 | use Phpdftk\Pdf\Core\PdfName; |
| 9 | use Phpdftk\Pdf\Core\PdfStream; |
| 10 | use Phpdftk\Pdf\Core\PdfVersion; |
| 11 | use Phpdftk\Pdf\Core\RequiresPdfVersion; |
| 12 | |
| 13 | /** |
| 14 | * XMP metadata stream (/Type /Metadata /Subtype /XML) — |
| 15 | * ISO 32000-2 §14.3.2, Table 339. |
| 16 | * |
| 17 | * Thin typed wrapper around a `PdfStream` that sets the two required |
| 18 | * header entries. Use `packages/xmp` to generate the packet bytes and |
| 19 | * pass them here; assign the resulting indirect reference to |
| 20 | * `Catalog::$metadata`, `Page::$metadata`, etc. |
| 21 | */ |
| 22 | #[RequiresPdfVersion(PdfVersion::V1_4)] |
| 23 | class MetadataStream extends PdfStream |
| 24 | { |
| 25 | public const PDF_TYPE = 'Metadata'; |
| 26 | public const PDF_SUBTYPE = 'XML'; |
| 27 | |
| 28 | public function __construct(string $xmpPacket = '') |
| 29 | { |
| 30 | parent::__construct(new PdfDictionary(), $xmpPacket); |
| 31 | } |
| 32 | |
| 33 | public function toPdf(): string |
| 34 | { |
| 35 | $this->dictionary->set('Type', new PdfName(self::PDF_TYPE)); |
| 36 | $this->dictionary->set('Subtype', new PdfName(self::PDF_SUBTYPE)); |
| 37 | return parent::toPdf(); |
| 38 | } |
| 39 | } |