Add naive buffer implementation

core-buffer/include/SFWriter.hpp

@@ -20,6 +20,9 @@ class SFWriter {
     H5::DataSet daq_rec_dataset_;
     H5::DataSet n_received_packets_dataset_;
 
+    std::unique_ptr<char[]> image_buffer_;
+    size_t image_buffer_count_;
+
 public:
     SFWriter(
             const std::string& output_file,

core-buffer/include/buffer_config.hpp

@@ -29,6 +29,9 @@ namespace core_buffer {
     const size_t BUFFER_RB_SIZE = 1000;
 
     const int WRITER_ZMQ_IO_THREADS = 16;
+
+    // How many frames to buffer before flushing to file.
+    const size_t WRITER_BUFFER_SIZE = 100;
 }
 
 #endif //BUFFERCONFIG_HPP