Fix infinite loops caused by calling circular indirect objects

fpdfsdk/src/fpdfview_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 <limits>
 #include <string>
 
 #include "fpdfsdk/src/fpdfview_c_api_test.h"
 #include "public/fpdfview.h"
 #include "testing/embedder_test.h"
@@ skipping 217 matching lines @@
 TEST_F(FPDFViewEmbeddertest, Hang_343) {
   EXPECT_FALSE(OpenDocument("bug_343.pdf"));
 }
 
 // The test should pass when the absence of 'Contents' field in a signature
 // dictionary will not cause an infinite loop in CPDF_SyntaxParser::GetObject().
 TEST_F(FPDFViewEmbeddertest, Hang_344) {
   EXPECT_FALSE(OpenDocument("bug_344.pdf"));
 }
 
+// The test should pass when there is no infinite recursion in
+// CPDF_SyntaxParser::GetString().
+TEST_F(FPDFViewEmbeddertest, Hang_355) {
+  EXPECT_FALSE(OpenDocument("bug_355.pdf"));
+}
 // The test should pass even when the file has circular references to pages.
 TEST_F(FPDFViewEmbeddertest, Hang_360) {
   EXPECT_FALSE(OpenDocument("bug_360.pdf"));
 }