From dd2920b2a46d776d01847c10f25041564d25d0e6 Mon Sep 17 00:00:00 2001
From: Riyyi <riyyi3@gmail.com>
Date: Thu, 25 Aug 2022 00:10:57 +0200
Subject: [PATCH] Emulator: Load cartridge header

---
 src/loader.cpp | 37 +++++++++++++++++++++++++++++++++++--
 src/loader.h   | 13 +++++++++----
 src/main.cpp   |  3 +--
 3 files changed, 45 insertions(+), 8 deletions(-)

diff --git a/src/loader.cpp b/src/loader.cpp
index 69a5a3d..7c8a823 100644
--- a/src/loader.cpp
+++ b/src/loader.cpp
@@ -4,11 +4,25 @@
  * SPDX-License-Identifier: MIT
  */
 
-#include "loader.h"
+#include <cstddef> // size_t
+
 #include "cpu.h"
 #include "emu.h"
+#include "loader.h"
 #include "ppu.h"
 #include "ruc/file.h"
+#include "ruc/format/print.h"
+
+void Loader::loadRom(std::string_view rom_path)
+{
+	if (!rom_path.empty()) {
+		m_rom_data = ruc::File(rom_path).data();
+	}
+
+	init();
+}
+
+// -----------------------------------------
 
 void Loader::init()
 {
@@ -24,7 +38,8 @@ void Loader::init()
 
 	// https://gbdev.io/pandocs/Memory_Map.html
 	// https://gbdev.io/pandocs/Power_Up_Sequence.html
-	Emu::the().addMemorySpace("BOOTROM1", 0x0000, 0x00ff);   // 256B
+	Emu::the().addMemorySpace("BOOTROM1", 0x0000, 0x00ff); // 256B
+	loadCartridgeHeader();
 	Emu::the().addMemorySpace("BOOTROM2", 0x0200, 0x08ff);   // 1792B
 	Emu::the().addMemorySpace("VRAM", 0x8000, 0x9fff, 2);    // 8KiB * 2 banks
 	Emu::the().addMemorySpace("CARDRAM", 0xa000, 0xbfff, 1); // 8KiB * ? banks, if any
@@ -48,6 +63,11 @@ void Loader::init()
 		Emu::the().writeMemory(i, bootrom[i]);
 	}
 
+	update();
+}
+
+void Loader::update()
+{
 	while (true) {
 		Emu::the().update();
 	}
@@ -57,3 +77,16 @@ void Loader::destroy()
 {
 	Emu::destroy();
 }
+
+void Loader::loadCartridgeHeader()
+{
+	if (m_rom_data.empty()) {
+		return;
+	}
+
+	Emu::the().addMemorySpace("CARTHEADER", 0x100, 0x14f);
+
+	for (size_t i = 0x100; i <= 0x14f; ++i) {
+		Emu::the().writeMemory(i, m_rom_data[i]);
+	}
+}
diff --git a/src/loader.h b/src/loader.h
index 633388b..45213d0 100644
--- a/src/loader.h
+++ b/src/loader.h
@@ -6,18 +6,23 @@
 
 #pragma once
 
-#include "ruc/singleton.h"
+#include <string>
 #include <string_view>
 
+#include "ruc/singleton.h"
+
 class Loader final : public ruc::Singleton<Loader> {
 public:
 	Loader(s) {}
 
+	void loadRom(std::string_view rom_path);
+
+private:
 	void init();
+	void update();
 	void destroy();
 
-	void setRomPath(std::string_view rom_path) { m_rom_path = rom_path; }
+	void loadCartridgeHeader();
 
-private:
-	std::string_view m_rom_path;
+	std::string m_rom_data;
 };
diff --git a/src/main.cpp b/src/main.cpp
index b409f12..3b5939f 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -19,8 +19,7 @@ int main(int argc, const char* argv[])
 	argParser.addOption(rom_path, 'r', "rom", nullptr, nullptr, "", ruc::ArgParser::Required::Yes);
 	argParser.parse(argc, argv);
 
-	Loader::the().setRomPath(rom_path);
-	Loader::the().init();
+	Loader::the().loadRom(rom_path);
 
 	return 0;
 }