2 files changed, 18 insertions, 0 deletions
diff --git a/core/fpdfapi/page/cpdf_contentmark.cpp b/core/fpdfapi/page/cpdf_contentmark.cpp
index 1ff567d9e6..4932ee6231 100644
--- a/core/fpdfapi/page/cpdf_contentmark.cpp
+++ b/core/fpdfapi/page/cpdf_contentmark.cpp
@@ -30,6 +30,13 @@ size_t CPDF_ContentMark::CountItems() const {
   return m_pMarkData->CountItems();
 }
 
+bool CPDF_ContentMark::ContainsItem(const CPDF_ContentMarkItem* pItem) const {
+  if (!m_pMarkData)
+    return false;
+
+  return m_pMarkData->ContainsItem(pItem);
+}
+
 CPDF_ContentMarkItem* CPDF_ContentMark::GetItem(size_t i) {
   ASSERT(i < CountItems());
   return m_pMarkData->GetItem(i);
@@ -105,6 +112,15 @@ size_t CPDF_ContentMark::MarkData::CountItems() const {
   return m_Marks.size();
 }
 
+bool CPDF_ContentMark::MarkData::ContainsItem(
+    const CPDF_ContentMarkItem* pItem) const {
+  for (const auto pMark : m_Marks) {
+    if (pMark.Get() == pItem)
+      return true;
+  }
+  return false;
+}
+
 CPDF_ContentMarkItem* CPDF_ContentMark::MarkData::GetItem(size_t index) {
   return m_Marks[index].Get();
 }
diff --git a/core/fpdfapi/page/cpdf_contentmark.h b/core/fpdfapi/page/cpdf_contentmark.h
index 8bbae52418..8dc98370e6 100644
--- a/core/fpdfapi/page/cpdf_contentmark.h
+++ b/core/fpdfapi/page/cpdf_contentmark.h
@@ -24,6 +24,7 @@ class CPDF_ContentMark {
   std::unique_ptr<CPDF_ContentMark> Clone();
   int GetMarkedContentID() const;
   size_t CountItems() const;
+  bool ContainsItem(const CPDF_ContentMarkItem* pItem) const;
 
   // The returned pointer is never null.
   CPDF_ContentMarkItem* GetItem(size_t i);
@@ -45,6 +46,7 @@ class CPDF_ContentMark {
     ~MarkData() override;
 
     size_t CountItems() const;
+    bool ContainsItem(const CPDF_ContentMarkItem* pItem) const;
     CPDF_ContentMarkItem* GetItem(size_t index);
     const CPDF_ContentMarkItem* GetItem(size_t index) const;