Merge to XFA: Remove default argument from CPDF_Dictionary::SetAt().

Also fix a potential object leak.

TBR=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1414963005 .

(cherry picked from commit f7992b39cec908e549fb995acae477a9efba538b)

Review URL: https://codereview.chromium.org/1421253005 .

2 files changed, 22 insertions, 19 deletions

diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp
index 07b1a208d7..46875d88a5 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp
@@ -717,27 +717,24 @@ FX_BOOL CPDF_Dictionary::KeyExist(const CFX_ByteStringC& key) const {
   void* value;
   return m_Map.Lookup(key, value);
 }
-void CPDF_Dictionary::SetAt(const CFX_ByteStringC& key,
-                            CPDF_Object* pObj,
-                            CPDF_IndirectObjects* pObjs) {
-  ASSERT(m_Type == PDFOBJ_DICTIONARY);
-  CPDF_Object* p = NULL;
-  m_Map.Lookup(key, (void*&)p);
-  if (p == pObj) {
+
+void CPDF_Dictionary::SetAt(const CFX_ByteStringC& key, CPDF_Object* pObj) {
+  ASSERT(IsDictionary());
+  void* pValue = nullptr;
+  m_Map.Lookup(key, pValue);
+  CPDF_Object* pExisting = static_cast<CPDF_Object*>(pValue);
+  if (pExisting == pObj)
     return;
-  }
-  if (p)
-    p->Release();
-  if (pObj) {
-    if (pObj->GetObjNum()) {
-      ASSERT(pObjs != NULL);
-      pObj = new CPDF_Reference(pObjs, pObj->GetObjNum());
-    }
+
+  if (pExisting)
+    pExisting->Release();
+
+  if (pObj)
     m_Map.SetAt(key, pObj);
-  } else {
+  else
     m_Map.RemoveKey(key);
-  }
 }
+
 void CPDF_Dictionary::AddValue(const CFX_ByteStringC& key, CPDF_Object* pObj) {
   ASSERT(m_Type == PDFOBJ_DICTIONARY);
   m_Map.AddValue(key, pObj);
diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
index 27cc8688cc..cbbeee6024 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
@@ -845,9 +845,15 @@ FX_BOOL CPDF_Parser::RebuildCrossRef() {
                         FX_POSITION pos = pTrailer->GetStartPos();
                         while (pos) {
                           CFX_ByteString key;
-                          CPDF_Object* pObj =
+                          CPDF_Object* pElement =
                               pTrailer->GetNextElement(pos, key);
-                          m_pTrailer->SetAt(key, pObj->Clone(), m_pDocument);
+                          FX_DWORD dwObjNum = pElement->GetObjNum();
+                          if (dwObjNum) {
+                            m_pTrailer->SetAtReference(key, m_pDocument,
+                                                       dwObjNum);
+                          } else {
+                            m_pTrailer->SetAt(key, pElement->Clone());
+                          }
                         }
                         pObj->Release();
                       } else {