2 files changed, 16 insertions, 0 deletions
diff --git a/test/cpp/util/byte_buffer_proto_helper.cc b/test/cpp/util/byte_buffer_proto_helper.cc
index bb5162f86e..37098955d4 100644
--- a/test/cpp/util/byte_buffer_proto_helper.cc
+++ b/test/cpp/util/byte_buffer_proto_helper.cc
@@ -40,5 +40,18 @@ std::unique_ptr<ByteBuffer> SerializeToByteBuffer(
   return std::unique_ptr<ByteBuffer>(new ByteBuffer(&slice, 1));
 }
 
+bool SerializeToByteBufferInPlace(grpc::protobuf::Message* message,
+                                  ByteBuffer* buffer) {
+  grpc::string buf;
+  if (!message->SerializeToString(&buf)) {
+    return false;
+  }
+  buffer->Clear();
+  Slice slice(buf);
+  ByteBuffer tmp(&slice, 1);
+  buffer->Swap(&tmp);
+  return true;
+}
+
 }  // namespace testing
 }  // namespace grpc
diff --git a/test/cpp/util/byte_buffer_proto_helper.h b/test/cpp/util/byte_buffer_proto_helper.h
index 94603db110..eb923eccb5 100644
--- a/test/cpp/util/byte_buffer_proto_helper.h
+++ b/test/cpp/util/byte_buffer_proto_helper.h
@@ -32,6 +32,9 @@ bool ParseFromByteBuffer(ByteBuffer* buffer, grpc::protobuf::Message* message);
 std::unique_ptr<ByteBuffer> SerializeToByteBuffer(
     grpc::protobuf::Message* message);
 
+bool SerializeToByteBufferInPlace(grpc::protobuf::Message* message,
+                                  ByteBuffer* buffer);
+
 }  // namespace testing
 }  // namespace grpc