Merge to XFA: Fix an infinite loop parsing in CPDF_SyntaxParser::GetObject()

fpdfsdk/src/fpdfview_embeddertest.cpp

Index: fpdfsdk/src/fpdfview_embeddertest.cpp
diff --git a/fpdfsdk/src/fpdfview_embeddertest.cpp b/fpdfsdk/src/fpdfview_embeddertest.cpp
index 6a6d0769830f2633796b14d405c720f9f3385f70..3147c01660ee2102b877787aac5a1fe118b4cde8 100644
--- a/fpdfsdk/src/fpdfview_embeddertest.cpp
+++ b/fpdfsdk/src/fpdfview_embeddertest.cpp
@@ -221,4 +221,10 @@ TEST_F(FPDFViewEmbeddertest, CrossRefV4Loop) {
 // cause infinite loop.
 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"));
 }