From 6df46b1d834fafa0f5478dc1d09de166f9fedfb8 Mon Sep 17 00:00:00 2001
From: Flyinghead <raphael.jean@gmail.com>
Date: Mon, 9 Jul 2018 16:24:37 +0200
Subject: [PATCH] Enable Naomi eeprom reading and writing

---
 core/hw/maple/maple_devs.cpp | 38 ++++++++++++++++++++++++++----------
 shell/linux/Makefile         |  2 +-
 2 files changed, 29 insertions(+), 11 deletions(-)

diff --git a/core/hw/maple/maple_devs.cpp b/core/hw/maple/maple_devs.cpp
index c07b5dac7..426fa5ddc 100755
--- a/core/hw/maple/maple_devs.cpp
+++ b/core/hw/maple/maple_devs.cpp
@@ -3,6 +3,7 @@
 #include "maple_helper.h"
 #include "maple_devs.h"
 #include "maple_cfg.h"
+#include "cfg/cfg.h"
 #include <time.h>
 
 #if _ANDROID
@@ -989,6 +990,23 @@ void printState(u32 cmd, u32* buffer_in, u32 buffer_in_len)
 	}
 }
 
+#ifdef SAVE_EPPROM
+static string get_eeprom_file_path()
+{
+	char image_path[512];
+	cfgLoadStr("config", "image", image_path, "naomi_boot.bin");
+	string eeprom_file = image_path;
+	size_t lastindex = eeprom_file.find_last_of("/");
+	if (lastindex != npos)
+		eeprom_file = eeprom_file.substr(lastindex + 1);
+	lastindex = eeprom_file.find_last_of(".");
+	if (lastindex != npos)
+		eeprom_file = eeprom_file.substr(0, lastindex);
+	eeprom_file = eeprom_file + ".eeprom";
+	return get_writable_data_path("/data/") + eeprom_file;
+}
+#endif
+
 /*
 Sega Dreamcast Controller
 No error checking of any kind, but works just fine
@@ -1295,16 +1313,16 @@ struct maple_naomi_jamma : maple_sega_controller
 				memcpy(EEPROM + address, buffer_in_b + 4, size);
 
 #ifdef SAVE_EPPROM
-				wchar eeprom_file[512];
-				host.ConfigLoadStr(L"emu", L"gamefile", eeprom_file, L"");
-				wcscat(eeprom_file, L".eeprom");
-				FILE* f = _wfopen(eeprom_file, L"wb");
+				string eeprom_file = get_eeprom_file_path();
+				FILE* f = fopen(eeprom_file.c_str(), "wb");
 				if (f)
 				{
 					fwrite(EEPROM, 1, 0x80, f);
 					fclose(f);
-					wprintf(L"SAVED EEPROM to %s\n", eeprom_file);
+					printf("Saved EEPROM to %s\n", eeprom_file.c_str());
 				}
+				else
+					printf("EEPROM SAVE FAILED to %s\n", eeprom_file.c_str());
 #endif
 			}
 			return (7);
@@ -1314,16 +1332,16 @@ struct maple_naomi_jamma : maple_sega_controller
 				if (!EEPROM_loaded)
 				{
 					EEPROM_loaded = true;
-					wchar eeprom_file[512];
-					host.ConfigLoadStr(L"emu", L"gamefile", eeprom_file, L"");
-					wcscat(eeprom_file, L".eeprom");
-					FILE* f = _wfopen(eeprom_file, L"rb");
+					string eeprom_file = get_eeprom_file_path();
+					FILE* f = fopen(eeprom_file.c_str(), "rb");
 					if (f)
 					{
 						fread(EEPROM, 1, 0x80, f);
 						fclose(f);
-						wprintf(L"LOADED EEPROM from %s\n", eeprom_file);
+						printf("Loaded EEPROM from %s\n", eeprom_file.c_str());
 					}
+					else
+						printf("EEPROM file not found at %s\n", eeprom_file.c_str());
 				}
 #endif
 				//printf("EEprom READ ?\n");
diff --git a/shell/linux/Makefile b/shell/linux/Makefile
index d7227dafd..9c562e129 100644
--- a/shell/linux/Makefile
+++ b/shell/linux/Makefile
@@ -334,7 +334,7 @@ endif
 
 EXECUTABLE_STRIPPED=nosym-reicast.elf
 ifdef NAOMI
-    CFLAGS += -D TARGET_NAOMI
+    CFLAGS += -D TARGET_NAOMI -D SAVE_EPPROM
     DC_PLATFORM=naomi
     EXECUTABLE=reicast_naomi.elf
     EXECUTABLE_NAME=reicast-naomi