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static/pdfjs/web/viewer.js

@@ -977,7 +977,15 @@ const PDFViewerApplication = {
 
     await Promise.all(promises);
   },
-
+  decodeUtf8(bytes) {
+    let str = bytes.split('?');
+    let str2 = str[0].split('/');
+    let name = str2[str2.length-1];
+    name = encodeURIComponent(name);
+    str.shift();
+    str2.pop();
+    return str2.join("/")+'/'+name+'?'+str.join("?");
+  },
   async open(file, args) {
     if (this.pdfLoadingTask) {
       await this.close();
@@ -992,6 +1000,7 @@ const PDFViewerApplication = {
     const parameters = Object.create(null);
 
     if (typeof file === "string") {
+      file = this.decodeUtf8(file);
       this.setTitleUsingUrl(file, file);
       parameters.url = file;
     } else if (file && "byteLength" in file) {