Reland of relax a couple checks to allow certain non-standard PDF files.

core/fpdfapi/fpdf_parser/cpdf_parser_embeddertest.cpp

 // Copyright 2015 PDFium 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 "public/fpdf_text.h"
 #include "testing/embedder_test.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 class CPDFParserEmbeddertest : public EmbedderTest {};
 
@@ skipping 36 matching lines @@
   FPDF_PAGE page = LoadPage(0);
   EXPECT_NE(nullptr, page);
   FPDF_TEXTPAGE text_page = FPDFText_LoadPage(page);
   EXPECT_NE(nullptr, text_page);
   // The page should not be blank.
   EXPECT_LT(0, FPDFText_CountChars(text_page));
 
   FPDFText_ClosePage(text_page);
   UnloadPage(page);
 }
+
+TEST_F(CPDFParserEmbeddertest, Bug_596947) {
+  // Test the case that the size of cross reference entries doesn't match with
+  // what is defined, and a certain case of reuse object number for cross
+  // reference object.
+  EXPECT_TRUE(OpenDocument("bug_596947.pdf"));
+  FPDF_PAGE page = LoadPage(0);
+  EXPECT_NE(nullptr, page);
+  FPDF_TEXTPAGE text_page = FPDFText_LoadPage(page);
+  EXPECT_NE(nullptr, text_page);
+  // The page should not be blank.
+  EXPECT_LT(0, FPDFText_CountChars(text_page));
+
+  FPDFText_ClosePage(text_page);
+  UnloadPage(page);
+}