Add a simple check for V4 cross reference table

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 {};
 
 TEST_F(CPDFParserEmbeddertest, LoadError_454695) {
   // Test a dictionary with hex string instead of correct content.
   // Verify that the defective pdf shouldn't be opened correctly.
   EXPECT_FALSE(OpenDocument("bug_454695.pdf"));
 }
@@ skipping 16 matching lines @@
 }
 
 TEST_F(CPDFParserEmbeddertest, Feature_Linearized_Loading) {
   EXPECT_TRUE(OpenDocument("feature_linearized_loading.pdf", true));
 }
 
 TEST_F(CPDFParserEmbeddertest, Bug_325) {
   EXPECT_FALSE(OpenDocument("bug_325_a.pdf"));
   EXPECT_FALSE(OpenDocument("bug_325_b.pdf"));
 }
+
+TEST_F(CPDFParserEmbeddertest, Bug_602650) {
+  // Test the case that cross reference entries, which are well formed,
+  // but do not match with the objects.
+  EXPECT_TRUE(OpenDocument("bug_602650.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);
+}