add StructMapper draft

src/data/StructMapper.hpp

@@ -0,0 +1,41 @@
+#pragma once
+
+#include <vector>
+#include <string>
+#include <unordered_map>
+
+#include "typedefs.hpp"
+
+namespace data {
+    enum class FieldType {
+        I8, I16, I32, I64, F32, F64
+    };
+
+    struct Field {
+        FieldType type;
+        std::string name;
+        int offset;
+    };
+    
+    class StructMapping {
+        std::vector<Field> fields;
+        std::unordered_map<std::string, int> indices;
+    public:
+        const Field* getField(const std::string& name) const {
+            auto found = indices.find(name);
+            if (found == indices.end()) {
+                return nullptr;
+            }
+            return &fields.at(found->second);
+        }
+    };
+
+    class StructAccess {
+        const StructMapping& mapping;
+        uint8_t* buffer;
+    public:
+        StructAccess(const StructMapping& mapping, uint8_t* buffer)
+            : mapping(mapping), buffer(buffer) {
+        }
+    };
+}