remove data copy from reader class

tools/src/util/dummy.cpp

@@ -1,3 +1,4 @@
+#include "util/types.h"
 #include "util/file.h"
 
 int main() {

tools/src/util/util/types.h

@@ -0,0 +1,15 @@
+#ifndef TOOLS_TYPES_H
+#define TOOLS_TYPES_H
+
+#include <cstdint>
+
+using s8 = int8_t;
+using u8 = uint8_t;
+using s16 = int16_t;
+using u16 = uint16_t;
+using s32 = int32_t;
+using u32 = uint32_t;
+using s64 = int64_t;
+using u64 = uint64_t;
+
+#endif // TOOLS_TYPES_H