PDF: Fix progress bar for files of unknown size.

pdf/pdfium/pdfium_engine.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "pdf/pdfium/pdfium_engine.h"
 
 #include <math.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 1196 matching lines @@
       if (IsPageVisible(pending_page))
         client_->Invalidate(GetPageScreenRect(pending_page));
     }
   }
   pending_pages_.swap(still_pending);
   if (update_pages)
     LoadPageInfo(true);
 }
 
 void PDFiumEngine::OnNewDataAvailable() {
+  if (!doc_loader_->GetDocumentSize()) {
+    client_->DocumentLoadProgress(doc_loader_->count_of_bytes_received(), 0);
+    return;
+  }
+
   const float progress = doc_loader_->GetProgress();
-  if (progress < 0.001) {
-    client_->DocumentLoadProgress(0, 0);
-  } else {
-    client_->DocumentLoadProgress(progress * 10000, 10000);
-  }
+  DCHECK_GE(progress, 0.0);
+  DCHECK_LE(progress, 1.0);
+  client_->DocumentLoadProgress(progress * 10000, 10000);
 }
 
 void PDFiumEngine::OnDocumentComplete() {
   if (doc_) {
     return FinishLoadingDocument();
   }
   file_access_.m_FileLen = doc_loader_->GetDocumentSize();
   if (!fpdf_availability_) {
     fpdf_availability_ = FPDFAvail_Create(&file_availability_, &file_access_);
     DCHECK(fpdf_availability_);
@@ skipping 2917 matching lines @@
 
 bool PDFiumEngineExports::GetPDFPageSizeByIndex(void* pdf_handle,
                                                 int page_number,
                                                 double* width,
                                                 double* height) {
   FPDF_DOCUMENT doc = pdf_handle;
   return doc && FPDF_GetPageSizeByIndex(doc, page_number, width, height) != 0;
 }
 
 }  // namespace chrome_pdf