Merge pull request #20827 from Snuffleupagus/worker-DocProgress-contentLength

Ensure that `percent === NaN` is consistently reported by the `onProgress` callback

src/core/worker.js

@@ -275,7 +275,7 @@ class WorkerMessageHandler {
           if (!fullReader.isStreamingSupported) {
             handler.send("DocProgress", {
               loaded,
-              total: Math.max(loaded, fullReader.contentLength || 0),
+              total: fullReader.contentLength,
             });
           }
 

src/display/api.js

@@ -2524,7 +2524,9 @@ class WorkerTransport {
     this.loadingTask.onProgress?.({
       loaded,
       total,
-      percent: MathClamp(Math.round((loaded / total) * 100), 0, 100),
+      percent: total
+        ? MathClamp(Math.round((loaded / total) * 100), 0, 100)
+        : NaN,
     });
   }
 

web/app.js

@@ -1255,6 +1255,10 @@ const PDFViewerApplication = {
         if (loadingTask !== this.pdfLoadingTask) {
           return undefined; // Ignore errors for previously opened PDF files.
         }
+        if (this.loadingBar) {
+          // Avoid the "indeterminate" loadingBar being displayed on error.
+          this.loadingBar.percent ||= 0;
+        }
 
         let key = "pdfjs-loading-error";
         if (reason instanceof InvalidPDFException) {

web/firefoxcom.js

@@ -577,11 +577,9 @@ class ExternalServices extends BaseExternalServices {
           pdfDataRangeTransport?.onDataProgressiveDone();
           break;
         case "progress":
-          const percent = MathClamp(
+          const percent = args.total
-            Math.round((args.loaded / args.total) * 100),
+            ? MathClamp(Math.round((args.loaded / args.total) * 100), 0, 100)
-            0,
+            : NaN;
-            100
-          );
 
           viewerApp.progress(percent);
           break;