diff --git a/tools/src/asset_processor/reader.cpp b/tools/src/asset_processor/reader.cpp
deleted file mode 100644
index f1d28293..00000000
--- a/tools/src/asset_processor/reader.cpp
+++ /dev/null
@@ -1,3 +0,0 @@
-#include "reader.h"
-#include "util.h"
-#include <string>
diff --git a/tools/src/asset_processor/reader.h b/tools/src/asset_processor/reader.h
index d375735b..021ea3c8 100644
--- a/tools/src/asset_processor/reader.h
+++ b/tools/src/asset_processor/reader.h
@@ -1,46 +1,36 @@
 #ifndef READER_H
 #define READER_H
 
-#include <cstdint>
 #include <vector>
-
-typedef uint8_t u8;
-typedef uint16_t u16;
-typedef uint32_t u32;
-typedef uint64_t u64;
-typedef int8_t s8;
-typedef int16_t s16;
-typedef int32_t s32;
-typedef int64_t s64;
+#include <util/types.h>
 
 class Reader {
   public:
-    Reader(const std::vector<char>& baserom, int start, int size) {
-        auto first = baserom.begin() + start;
-        auto last = baserom.begin() + start + size;
-        data = std::vector<char>(first, last);
+    Reader(const std::vector<char>& baserom, int start, int size_) : data(baserom.data() + start), size(size_) {
     }
 
-    s8 read_s8() {
+    [[nodiscard]] s8 read_s8() {
+        // TODO range check
         return data[static_cast<unsigned long>(cursor++)];
     }
 
-    u8 read_u8() {
+    [[nodiscard]] u8 read_u8() {
         return static_cast<u8>(read_s8());
     }
 
-    u16 read_u16() {
+    [[nodiscard]] u16 read_u16() {
         return static_cast<u16>(read_u8() + (read_u8() << 8));
     }
 
-    u32 read_u32() {
+    [[nodiscard]] u32 read_u32() {
         return static_cast<u32>(read_u16() + (read_u16() << 16));
     }
 
     int cursor = 0;
 
   private:
-    std::vector<char> data;
+    const char* data;
+    const int size;
 };
 
 #endif
\ No newline at end of file
diff --git a/tools/src/asset_processor/util.h b/tools/src/asset_processor/util.h
index 111b4e47..00781a20 100644
--- a/tools/src/asset_processor/util.h
+++ b/tools/src/asset_processor/util.h
@@ -4,20 +4,10 @@
 #include <nlohmann/json_fwd.hpp>
 #include <memory>
 #include <stdexcept>
-#include <stdint.h>
-#include <stdlib.h>
+#include <cstdlib>
 #include <string>
 #include <vector>
 
-typedef uint8_t u8;
-typedef uint16_t u16;
-typedef uint32_t u32;
-typedef uint64_t u64;
-typedef int8_t s8;
-typedef int16_t s16;
-typedef int32_t s32;
-typedef int64_t s64;
-
 void check_call(const std::vector<std::string>& cmd);
 
 std::string opt_param(const std::string& format, int defaultVal, int value);
diff --git a/tools/src/util/dummy.cpp b/tools/src/util/dummy.cpp
index e64e616c..c20979ec 100644
--- a/tools/src/util/dummy.cpp
+++ b/tools/src/util/dummy.cpp
@@ -1,3 +1,4 @@
+#include "util/types.h"
 #include "util/file.h"
 
 int main() {
diff --git a/tools/src/util/util/types.h b/tools/src/util/util/types.h
new file mode 100644
index 00000000..ef3e98f7
--- /dev/null
+++ b/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