From 647c08e1e69d0243528b75c56c32310d8c3cd095 Mon Sep 17 00:00:00 2001
From: negative <negativeExponent@users.noreply.github.com>
Date: Sun, 7 Jan 2024 21:59:25 +0800
Subject: [PATCH] Add support for misc rom area

---
 src/ines.cpp | 18 +++++++++++++++++-
 src/ines.h   |  2 ++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/src/ines.cpp b/src/ines.cpp
index a09189de..47329738 100644
--- a/src/ines.cpp
+++ b/src/ines.cpp
@@ -49,6 +49,7 @@ extern SFORMAT FCEUVSUNI_STATEINFO[];
 uint8 *trainerpoo = NULL;
 uint8 *ROM = NULL;
 uint8 *VROM = NULL;
+uint8 *MiscROM = NULL;
 uint8 *ExtraNTARAM = NULL;
 iNES_HEADER head;
 
@@ -58,6 +59,7 @@ uint8 Mirroring = 0;
 uint8 MirroringAs2bits = 0;
 uint32 ROM_size = 0;
 uint32 VROM_size = 0;
+uint32 MiscROM_size = 0;
 char LoadedRomFName[4096]; //mbg merge 7/17/06 added
 char LoadedRomFNamePatchToUse[4096];
 
@@ -806,10 +808,13 @@ int iNESLoad(const char *name, FCEUFILE *fp, int OverwriteVidMode) {
 	struct md5_context md5;
 	uint64 partialmd5 = 0;
 	const char* mappername = "Not Listed";
+	size_t filesize = FCEU_fgetsize(fp);
 
 	if (FCEU_fread(&head, 1, 16, fp) != 16 || memcmp(&head, "NES\x1A", 4))
 		return LOADER_INVALID_FORMAT;
-	
+	// Remove header size from filesize
+	filesize -= 16;
+
 	head.cleanup();
 
 	iNESCart.clear();
@@ -946,6 +951,7 @@ int iNESLoad(const char *name, FCEUFILE *fp, int OverwriteVidMode) {
 	if (head.ROM_type & 4) {	/* Trainer */
 		trainerpoo = (uint8*)FCEU_gmalloc(512);
 		FCEU_fread(trainerpoo, 512, 1, fp);
+		filesize -= 512;
 	}
 
 	ResetCartMapping();
@@ -957,6 +963,15 @@ int iNESLoad(const char *name, FCEUFILE *fp, int OverwriteVidMode) {
 
 	if (vrom_size_bytes)
 		FCEU_fread(VROM, 1, vrom_size_bytes, fp);
+	
+	// Misc ROMS
+	if ((head.misc_roms & 0x03) && !(head.ROM_type & 4)) {
+		MiscROM_size = filesize - rom_size_bytes - vrom_size_bytes;
+		MiscROM = (uint8 *)FCEU_malloc(MiscROM_size);
+		memset(MiscROM, 0xFF, MiscROM_size);
+		FCEU_fread(MiscROM, 1, MiscROM_size, fp);
+		FCEU_printf(" Misc ROM size : %d\n", MiscROM_size);
+	}
 
 	md5_starts(&md5); 
 	md5_update(&md5, ROM, rom_size_bytes);
@@ -1008,6 +1023,7 @@ int iNESLoad(const char *name, FCEUFILE *fp, int OverwriteVidMode) {
 			FCEU_printf(" WRAM backed by battery: %d KiB\n", iNESCart.battery_wram_size / 1024);
 			FCEU_printf(" VRAM backed by battery: %d KiB\n", iNESCart.battery_vram_size / 1024);
 		}
+		if (head.misc_roms & 0x03) FCEU_printf(" Misc ROM: %d KiB\n", MiscROM_size / 1024);
 	}
 
 	SetInput();
diff --git a/src/ines.h b/src/ines.h
index 6c95863a..7d738bd3 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -42,8 +42,10 @@ public:
 //mbg merge 6/29/06
 extern uint8 *ROM;
 extern uint8 *VROM;
+extern uint8 *MiscROM;
 extern uint32 VROM_size;
 extern uint32 ROM_size;
+extern uint32 MiscROM_size;
 extern uint8 *ExtraNTARAM;
 extern uint8 **VPageR;
 extern int iNesSave(void); //bbit Edited: line added