diff --git a/sf-writer/src/ImageAssembler.hpp b/sf-writer/src/ImageAssembler.hpp
index 5abb76a..60f0088 100644
--- a/sf-writer/src/ImageAssembler.hpp
+++ b/sf-writer/src/ImageAssembler.hpp
@@ -3,6 +3,16 @@
 
 
 class ImageAssembler {
+public:
+    void process(const int slot_id,
+                 const int i_module,
+                 const BufferBinaryBlock* block_buffer);
+    int get_free_slot();
+    int get_full_slot();
+    void free_slot(int slot_id);
+
+    const ImageMetadataBlock* get_metadata_buffer(int slot_id);
+    const char* get_data_buffer(int slot_id);
 
 };