1 files changed, 12 insertions, 4 deletions
diff --git a/src/google/protobuf/unknown_field_set.h b/src/google/protobuf/unknown_field_set.h
index aa752916..c2ad8918 100644
--- a/src/google/protobuf/unknown_field_set.h
+++ b/src/google/protobuf/unknown_field_set.h
@@ -52,6 +52,7 @@ namespace protobuf {
     class ZeroCopyInputStream;      // zero_copy_stream.h
   }
   namespace internal {
+    class InternalMetadataWithArena;  // metadata.h
     class WireFormat;               // wire_format.h
     class MessageSetFieldSkipperUsingCord;
                                     // extension_set_heavy.cc
@@ -92,6 +93,13 @@ class LIBPROTOBUF_EXPORT UnknownFieldSet {
   // Similar to above, but this function will destroy the contents of other.
   void MergeFromAndDestroy(UnknownFieldSet* other);
 
+  // Merge the contents an UnknownFieldSet with the UnknownFieldSet in
+  // *metadata, if there is one.  If *metadata doesn't have an UnknownFieldSet
+  // then add one to it and make it be a copy of the first arg.
+  static void MergeToInternalMetdata(
+      const UnknownFieldSet& other,
+      internal::InternalMetadataWithArena* metadata);
+
   // Swaps the contents of some other UnknownFieldSet with this one.
   inline void Swap(UnknownFieldSet* x);
 
@@ -175,7 +183,7 @@ class LIBPROTOBUF_EXPORT UnknownField {
     TYPE_GROUP
   };
 
-  // The field's tag number, as seen on the wire.
+  // The field's field number, as seen on the wire.
   inline int number() const;
 
   // The field type.
@@ -204,7 +212,7 @@ class LIBPROTOBUF_EXPORT UnknownField {
   void SerializeLengthDelimitedNoTag(io::CodedOutputStream* output) const;
   uint8* SerializeLengthDelimitedNoTagToArray(uint8* target) const;
 
-  inline int GetLengthDelimitedSize() const;
+  inline size_t GetLengthDelimitedSize() const;
 
  private:
   friend class UnknownFieldSet;
@@ -330,9 +338,9 @@ inline UnknownFieldSet* UnknownField::mutable_group() {
   return group_;
 }
 
-inline int UnknownField::GetLengthDelimitedSize() const {
+inline size_t UnknownField::GetLengthDelimitedSize() const {
   GOOGLE_DCHECK_EQ(TYPE_LENGTH_DELIMITED, type());
-  return static_cast<int>(length_delimited_.string_value_->size());
+  return length_delimited_.string_value_->size();
 }
 
 inline void UnknownField::SetType(Type type) {