subdocument-splitting-plan

src/routes/tools/separate/+page.svelte

@@ -1,10 +1,10 @@
 <script lang="ts">
 	import { onDestroy } from 'svelte';
-	import { PDFDocument } from 'pdf-lib';
 	import FileDropzone from '$lib/components/FileDropzone.svelte';
 	import PdfPageGrid from '$lib/components/PdfPageGrid.svelte';
 	import Button from '$lib/components/ui/button.svelte';
 	import { downloadBlob } from '$lib/download';
+	import { copyPagesToNewPdf } from '$lib/pdf-processing';
 	import { loadPdfDocument, type PdfDocumentHandle } from '$lib/pdf-thumbnails';
 
 	let pdfFile: File | null = $state(null);
@@ -64,11 +64,9 @@
 
 		try {
 			const bytes = new Uint8Array(await pdfFile.arrayBuffer());
-			const sourcePdf = await PDFDocument.load(bytes);
-			const outputPdf = await PDFDocument.create();
 
 			const pagesToKeep: number[] = [];
-			for (let i = 0; i < sourcePdf.getPageCount(); i++) {
+			for (let i = 0; i < pdfHandle.pageCount; i++) {
 				if (!selectedPages.has(i + 1)) {
 					pagesToKeep.push(i);
 				}
@@ -80,10 +78,7 @@
 				return;
 			}
 
-			const copiedPages = await outputPdf.copyPages(sourcePdf, pagesToKeep);
-			copiedPages.forEach((page) => outputPdf.addPage(page));
-
-			const resultBytes = await outputPdf.save();
+			const resultBytes = await copyPagesToNewPdf(bytes, pagesToKeep);
 			const baseName = pdfFile.name.replace(/\.pdf$/i, '');
 			downloadBlob(resultBytes, `${baseName}_ohne_seiten.pdf`);
 		} catch (err) {