Add metadata buffer class

lib/src/MetadataBuffer.hpp

@@ -0,0 +1,25 @@
+#ifndef METADATABUFFER_H
+#define METADATABUFFER_H
+
+#include <unordered_map>
+#include <string>
+
+#include "ZmqReceiver.hpp"
+
+
+class MetadataBuffer
+{
+    const uint64_t n_images;
+    const std::shared_ptr<std::unordered_map<std::string, HeaderDataType>> header_values_type;
+
+    protected:
+	std::unordered_map<std::string, std::shared_ptr<char>> metadata_buffer;
+	std::unordered_map<std::string, size_t> metadata_length_bytes;
+
+    public:
+	MetadataBuffer(uint64_t n_images, std::shared_ptr<std::unordered_map<std::string, HeaderDataType>> header_values_type);
+	void add_metadata_to_buffer(std::string name, uint64_t frame_index, const char* data);
+	std::shared_ptr<char> get_metadata_values(std::string name);
+};
+
+#endif