add StructMapper read/write methods

test/data/StructMapper.cpp

@@ -0,0 +1,23 @@
+#include "data/StructMapper.hpp"
+
+#include <gtest/gtest.h>
+
+using namespace data;
+
+TEST(StructMapper, ReadWrite) {
+    ubyte buffer[16] {};
+
+    std::vector<Field> fields {
+        Field {FieldType::I8, "a", 1},
+        Field {FieldType::I32, "b", 1},
+        Field {FieldType::F32, "f", 1},
+    };
+    auto mapping = StructMapping::create(fields);
+    EXPECT_EQ(mapping.size(), 9);
+
+    mapping.setInteger(buffer, 42, "a");
+    EXPECT_EQ(mapping.getInteger(buffer, "a"), 42);
+
+    mapping.setNumber(buffer, 3.141592f, "f");
+    EXPECT_FLOAT_EQ(mapping.getNumber(buffer, "f"), 3.141592f);
+}