Lazy loading of PDF documents (#37) (#38)

johnfactotum · Oct 18, 2024 · f24e611 · f24e611
1 parent 022ea7d
commit f24e611
Showing 1 changed file with 7 additions and 2 deletions.
diff --git a/pdf.js b/pdf.js
@@ -105,9 +105,14 @@ const makeTOCItem = item => ({
 })
 
 export const makePDF = async file => {
-    const data = new Uint8Array(await file.arrayBuffer())
+    const transport = new pdfjsLib.PDFDataRangeTransport(file.size, [])
+    transport.requestDataRange = (begin, end) => {
+        file.slice(begin, end).arrayBuffer().then(chunk => {
+            transport.onDataRange(begin, chunk)
+        })
+    }
     const pdf = await pdfjsLib.getDocument({
-        data,
+        range: transport,
         cMapUrl: pdfjsPath('cmaps/'),
         standardFontDataUrl: pdfjsPath('standard_fonts/'),
         isEvalSupported: false,