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+/*******************************************************************************
+  Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
+ 
+  (c) Copyright 1996 - 2002 Gary Henderson (gary.henderson@ntlworld.com) and
+                            Jerremy Koot (jkoot@snes9x.com)
+
+  (c) Copyright 2001 - 2004 John Weidman (jweidman@slip.net)
+
+  (c) Copyright 2002 - 2004 Brad Jorsch (anomie@users.sourceforge.net),
+                            funkyass (funkyass@spam.shaw.ca),
+                            Joel Yliluoma (http://iki.fi/bisqwit/)
+                            Kris Bleakley (codeviolation@hotmail.com),
+                            Matthew Kendora,
+                            Nach (n-a-c-h@users.sourceforge.net),
+                            Peter Bortas (peter@bortas.org) and
+                            zones (kasumitokoduck@yahoo.com)
+
+  C4 x86 assembler and some C emulation code
+  (c) Copyright 2000 - 2003 zsKnight (zsknight@zsnes.com),
+                            _Demo_ (_demo_@zsnes.com), and Nach
+
+  C4 C++ code
+  (c) Copyright 2003 Brad Jorsch
+
+  DSP-1 emulator code
+  (c) Copyright 1998 - 2004 Ivar (ivar@snes9x.com), _Demo_, Gary Henderson,
+                            John Weidman, neviksti (neviksti@hotmail.com),
+                            Kris Bleakley, Andreas Naive
+
+  DSP-2 emulator code
+  (c) Copyright 2003 Kris Bleakley, John Weidman, neviksti, Matthew Kendora, and
+                     Lord Nightmare (lord_nightmare@users.sourceforge.net
+
+  OBC1 emulator code
+  (c) Copyright 2001 - 2004 zsKnight, pagefault (pagefault@zsnes.com) and
+                            Kris Bleakley
+  Ported from x86 assembler to C by sanmaiwashi
+
+  SPC7110 and RTC C++ emulator code
+  (c) Copyright 2002 Matthew Kendora with research by
+                     zsKnight, John Weidman, and Dark Force
+
+  S-DD1 C emulator code
+  (c) Copyright 2003 Brad Jorsch with research by
+                     Andreas Naive and John Weidman
+ 
+  S-RTC C emulator code
+  (c) Copyright 2001 John Weidman
+  
+  ST010 C++ emulator code
+  (c) Copyright 2003 Feather, Kris Bleakley, John Weidman and Matthew Kendora
+
+  Super FX x86 assembler emulator code 
+  (c) Copyright 1998 - 2003 zsKnight, _Demo_, and pagefault 
+
+  Super FX C emulator code 
+  (c) Copyright 1997 - 1999 Ivar, Gary Henderson and John Weidman
+
+
+  SH assembler code partly based on x86 assembler code
+  (c) Copyright 2002 - 2004 Marcus Comstedt (marcus@mc.pp.se) 
+
+ 
+  Specific ports contains the works of other authors. See headers in
+  individual files.
+ 
+  Snes9x homepage: http://www.snes9x.com
+ 
+  Permission to use, copy, modify and distribute Snes9x in both binary and
+  source form, for non-commercial purposes, is hereby granted without fee,
+  providing that this license information and copyright notice appear with
+  all copies and any derived work.
+ 
+  This software is provided 'as-is', without any express or implied
+  warranty. In no event shall the authors be held liable for any damages
+  arising from the use of this software.
+ 
+  Snes9x is freeware for PERSONAL USE only. Commercial users should
+  seek permission of the copyright holders first. Commercial use includes
+  charging money for Snes9x or software derived from Snes9x.
+ 
+  The copyright holders request that bug fixes and improvements to the code
+  should be forwarded to them so everyone can benefit from the modifications
+  in future versions.
+ 
+  Super NES and Super Nintendo Entertainment System are trademarks of
+  Nintendo Co., Limited and its subsidiary companies.
+*******************************************************************************/
+#include <stdio.h>
+#include <ctype.h>
+#include <string.h>
+#include "snes9x.h"
+#include "cheats.h"
+#include "memmap.h"
+
+extern SCheatData Cheat;
+
+void S9xInitCheatData ()
+{
+    Cheat.RAM = Memory.RAM;
+    Cheat.SRAM = ::SRAM;
+    Cheat.FillRAM = Memory.FillRAM;
+}
+
+void S9xAddCheat (bool8 enable, bool8 save_current_value, 
+		  uint32 address, uint8 byte)
+{
+    if (Cheat.num_cheats < sizeof (Cheat.c) / sizeof (Cheat. c [0]))
+    {
+	Cheat.c [Cheat.num_cheats].address = address;
+	Cheat.c [Cheat.num_cheats].byte = byte;
+	Cheat.c [Cheat.num_cheats].enabled = TRUE;
+	if (save_current_value)
+	{
+	    Cheat.c [Cheat.num_cheats].saved_byte = S9xGetByte (address);
+	    Cheat.c [Cheat.num_cheats].saved = TRUE;
+	}
+	Cheat.num_cheats++;
+    }
+}
+
+void S9xDeleteCheat (uint32 which1)
+{
+    if (which1 < Cheat.num_cheats)
+    {
+	if (Cheat.c [which1].enabled)
+	    S9xRemoveCheat (which1);
+
+	memmove (&Cheat.c [which1], &Cheat.c [which1 + 1],
+		 sizeof (Cheat.c [0]) * (Cheat.num_cheats - which1 - 1));
+	Cheat.num_cheats--; //MK: This used to set it to 0??
+    }
+}
+
+void S9xDeleteCheats ()
+{
+    S9xRemoveCheats ();
+    Cheat.num_cheats = 0;
+}
+
+void S9xEnableCheat (uint32 which1)
+{
+    if (which1 < Cheat.num_cheats && !Cheat.c [which1].enabled)
+    {
+	Cheat.c [which1].enabled = TRUE;
+	S9xApplyCheat (which1);
+    }
+}
+
+void S9xDisableCheat (uint32 which1)
+{
+    if (which1 < Cheat.num_cheats && Cheat.c [which1].enabled)
+    {
+	S9xRemoveCheat (which1);
+	Cheat.c [which1].enabled = FALSE;
+    }
+}
+
+void S9xRemoveCheat (uint32 which1)
+{
+    if (Cheat.c [which1].saved)
+    {
+	uint32 address = Cheat.c [which1].address;
+
+	int block = (address >> MEMMAP_SHIFT) & MEMMAP_MASK;
+	uint8 *ptr = Memory.Map [block];
+	    
+	if (ptr >= (uint8 *) CMemory::MAP_LAST)
+	    *(ptr + (address & 0xffff)) = Cheat.c [which1].saved_byte;
+	else
+	    S9xSetByte (Cheat.c [which1].saved_byte, address);
+    }
+}
+
+void S9xApplyCheat (uint32 which1)
+{
+    uint32 address = Cheat.c [which1].address;
+
+    if (!Cheat.c [which1].saved)
+	Cheat.c [which1].saved_byte = S9xGetByte (address);
+
+    int block = (address >> MEMMAP_SHIFT) & MEMMAP_MASK;
+    uint8 *ptr = Memory.Map [block];
+    
+    if (ptr >= (uint8 *) CMemory::MAP_LAST)
+	*(ptr + (address & 0xffff)) = Cheat.c [which1].byte;
+    else
+	S9xSetByte (Cheat.c [which1].byte, address);
+    Cheat.c [which1].saved = TRUE;
+}
+
+void S9xApplyCheats ()
+{
+    if (Settings.ApplyCheats)
+    {
+        for (uint32 i = 0; i < Cheat.num_cheats; i++)
+            if (Cheat.c [i].enabled)
+                S9xApplyCheat (i);
+    }
+}
+
+void S9xRemoveCheats ()
+{
+    for (uint32 i = 0; i < Cheat.num_cheats; i++)
+	if (Cheat.c [i].enabled)
+	    S9xRemoveCheat (i);
+}
+
+bool8 S9xLoadCheatFile (const char *filename)
+{
+    Cheat.num_cheats = 0;
+
+    FILE *fs = fopen (filename, "rb");
+    uint8 data [28];
+
+    if (!fs)
+	return (FALSE);
+
+    while (fread ((void *) data, 1, 28, fs) == 28)
+    {
+	Cheat.c [Cheat.num_cheats].enabled = (data [0] & 4) == 0;
+	Cheat.c [Cheat.num_cheats].byte = data [1];
+	Cheat.c [Cheat.num_cheats].address = data [2] | (data [3] << 8) |  (data [4] << 16);
+	Cheat.c [Cheat.num_cheats].saved_byte = data [5];
+	Cheat.c [Cheat.num_cheats].saved = (data [0] & 8) != 0;
+	memmove (Cheat.c [Cheat.num_cheats].name, &data [8], 20);
+	Cheat.c [Cheat.num_cheats++].name [20] = 0;
+    }
+    fclose (fs);
+
+    return (TRUE);
+}
+
+bool8 S9xSaveCheatFile (const char *filename)
+{
+    if (Cheat.num_cheats == 0)
+    {
+	(void) remove (filename);
+	return (TRUE);
+    }
+
+    FILE *fs = fopen (filename, "wb");
+    uint8 data [28];
+
+    if (!fs)
+	return (FALSE);
+
+    uint32 i;
+    for (i = 0; i < Cheat.num_cheats; i++)
+    {
+	memset (data, 0, 28);
+	if (i == 0)
+	{
+	    data [6] = 254;
+	    data [7] = 252;
+	}
+	if (!Cheat.c [i].enabled)
+	    data [0] |= 4;
+
+	if (Cheat.c [i].saved)
+	    data [0] |= 8;
+
+	data [1] = Cheat.c [i].byte;
+	data [2] = (uint8) Cheat.c [i].address;
+	data [3] = (uint8) (Cheat.c [i].address >> 8);
+	data [4] = (uint8) (Cheat.c [i].address >> 16);
+	data [5] = Cheat.c [i].saved_byte;
+
+	memmove (&data [8], Cheat.c [i].name, 19);
+	if (fwrite (data, 28, 1, fs) != 1)
+	{
+	    fclose (fs);
+	    return (FALSE);
+	}
+    }
+
+    fclose (fs);
+    return (TRUE);
+}
+
+