Add original header to frame metadata

src/ProcessManager.cpp

@@ -105,9 +105,9 @@ void ProcessManager::receive_zmq(WriterManager& manager, RingBuffer& ring_buffer
         }
 
         // Parse JSON header.
-        string header_string(static_cast<char*>(message_header.data()), message_header.size());
+        frame_metadata.header_string = string(static_cast<char*>(message_header.data()), message_header.size());
         stringstream header_stream;
-        header_stream << header_string << endl;
+        header_stream << frame_metadata.header_string << endl;
         pt::read_json(header_stream, json_header);
 
         // Extract data from message header.

src/RingBuffer.hpp

@@ -11,10 +11,10 @@
 struct FrameMetadata
 {
     FrameMetadata(){}
-
+    
     FrameMetadata(const FrameMetadata& other) : 
         buffer_slot_index(other.buffer_slot_index), frame_bytes_size(other.frame_bytes_size), frame_index(other.frame_index), 
-        endianness(other.endianness), type(other.type) {
+        endianness(other.endianness), type(other.type), header_string(other.header_string) {
         frame_shape[0] = other.frame_shape[0];
         frame_shape[1] = other.frame_shape[1];
     }
@@ -28,6 +28,9 @@ struct FrameMetadata
     std::string endianness;
     std::string type;
     size_t frame_shape[2];
+
+    // Pass the original header as well.
+    std::string header_string;
 };
 
 class RingBuffer