Check whether a pdf has XFA fields before loading XFA fields

samples/pdfium_test.cc

 // Copyright (c) 2010 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 <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <wchar.h>
 
@@ skipping 450 matching lines @@
   (void) FPDFAvail_IsDocAvail(pdf_avail, &hints);
 
   if (!FPDFAvail_IsLinearized(pdf_avail)) {
     fprintf(stderr, "Non-linearized path...\n");
     doc = FPDF_LoadCustomDocument(&file_access, NULL);
   } else {
     fprintf(stderr, "Linearized path...\n");
     doc = FPDFAvail_GetDocument(pdf_avail, NULL);
   }
 
+  if (!doc)
+  {
+    fprintf(stderr, "Load pdf docs unsuccessful.\n");
+    return;
+  }
+
   (void) FPDF_GetDocPermissions(doc);
   (void) FPDFAvail_IsFormAvail(pdf_avail, &hints);
 
   FPDF_FORMHANDLE form = FPDFDOC_InitFormFillEnvironment(doc, &form_callbacks);
-  if (!FPDF_LoadXFA(doc)) {
-    fprintf(stderr, "LoadXFA unsuccessful, continuing anyway.\n");
+  int docType = DOCTYPE_PDF;
+  if (FPDF_HasXFAField(doc, docType))
+  {
+      if (docType != DOCTYPE_PDF && !FPDF_LoadXFA(doc))
+          fprintf(stderr, "LoadXFA unsuccessful, continuing anyway.\n");
   }
   FPDF_SetFormFieldHighlightColor(form, 0, 0xFFE4DD);
   FPDF_SetFormFieldHighlightAlpha(form, 100);
 
   int first_page = FPDFAvail_GetFirstPageNum(doc);
   (void) FPDFAvail_IsPageAvail(pdf_avail, first_page, &hints);
 
   int page_count = FPDF_GetPageCount(doc);
   for (int i = 0; i < page_count; ++i) {
     (void) FPDFAvail_IsPageAvail(pdf_avail, i, &hints);
@@ skipping 125 matching lines @@
     RenderPdf(filename, file_contents, file_length, options);
     free(file_contents);
   }
 
   FPDF_DestroyLibrary();
   v8::V8::ShutdownPlatform();
   delete platform;
 
   return 0;
 }