memmap.c

/***********************************************************************************
  Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.

  (c) Copyright 1996 - 2002  Gary Henderson (gary.henderson@ntlworld.com),
                             Jerremy Koot (jkoot@snes9x.com)

  (c) Copyright 2002 - 2004  Matthew Kendora

  (c) Copyright 2002 - 2005  Peter Bortas (peter@bortas.org)

  (c) Copyright 2004 - 2005  Joel Yliluoma (http://iki.fi/bisqwit/)

  (c) Copyright 2001 - 2006  John Weidman (jweidman@slip.net)

  (c) Copyright 2002 - 2006  funkyass (funkyass@spam.shaw.ca),
                             Kris Bleakley (codeviolation@hotmail.com)

  (c) Copyright 2002 - 2010  Brad Jorsch (anomie@users.sourceforge.net),
                             Nach (n-a-c-h@users.sourceforge.net),
                             zones (kasumitokoduck@yahoo.com)

  (c) Copyright 2006 - 2007  nitsuja

  (c) Copyright 2009 - 2010  BearOso,
                             OV2


  BS-X C emulator code
  (c) Copyright 2005 - 2006  Dreamer Nom,
                             zones

  C4 x86 assembler and some C emulation code
  (c) Copyright 2000 - 2003  _Demo_ (_demo_@zsnes.com),
                             Nach,
                             zsKnight (zsknight@zsnes.com)

  C4 C++ code
  (c) Copyright 2003 - 2006  Brad Jorsch,
                             Nach

  DSP-1 emulator code
  (c) Copyright 1998 - 2006  _Demo_,
                             Andreas Naive (andreasnaive@gmail.com),
                             Gary Henderson,
                             Ivar (ivar@snes9x.com),
                             John Weidman,
                             Kris Bleakley,
                             Matthew Kendora,
                             Nach,
                             neviksti (neviksti@hotmail.com)

  DSP-2 emulator code
  (c) Copyright 2003         John Weidman,
                             Kris Bleakley,
                             Lord Nightmare (lord_nightmare@users.sourceforge.net),
                             Matthew Kendora,
                             neviksti

  DSP-3 emulator code
  (c) Copyright 2003 - 2006  John Weidman,
                             Kris Bleakley,
                             Lancer,
                             z80 gaiden

  DSP-4 emulator code
  (c) Copyright 2004 - 2006  Dreamer Nom,
                             John Weidman,
                             Kris Bleakley,
                             Nach,
                             z80 gaiden

  OBC1 emulator code
  (c) Copyright 2001 - 2004  zsKnight,
                             pagefault (pagefault@zsnes.com),
                             Kris Bleakley
                             Ported from x86 assembler to C by sanmaiwashi

  SPC7110 and RTC C++ emulator code used in 1.39-1.51
  (c) Copyright 2002         Matthew Kendora with research by
                             zsKnight,
                             John Weidman,
                             Dark Force

  SPC7110 and RTC C++ emulator code used in 1.52+
  (c) Copyright 2009         byuu,
                             neviksti

  S-DD1 C emulator code
  (c) Copyright 2003         Brad Jorsch with research by
                             Andreas Naive,
                             John Weidman

  S-RTC C emulator code
  (c) Copyright 2001 - 2006  byuu,
                             John Weidman

  ST010 C++ emulator code
  (c) Copyright 2003         Feather,
                             John Weidman,
                             Kris Bleakley,
                             Matthew Kendora

  Super FX x86 assembler emulator code
  (c) Copyright 1998 - 2003  _Demo_,
                             pagefault,
                             zsKnight

  Super FX C emulator code
  (c) Copyright 1997 - 1999  Ivar,
                             Gary Henderson,
                             John Weidman

  Sound emulator code used in 1.5-1.51
  (c) Copyright 1998 - 2003  Brad Martin
  (c) Copyright 1998 - 2006  Charles Bilyue'

  Sound emulator code used in 1.52+
  (c) Copyright 2004 - 2007  Shay Green (gblargg@gmail.com)

  SH assembler code partly based on x86 assembler code
  (c) Copyright 2002 - 2004  Marcus Comstedt (marcus@mc.pp.se)

  2xSaI filter
  (c) Copyright 1999 - 2001  Derek Liauw Kie Fa

  HQ2x, HQ3x, HQ4x filters
  (c) Copyright 2003         Maxim Stepin (maxim@hiend3d.com)

  NTSC filter
  (c) Copyright 2006 - 2007  Shay Green

  GTK+ GUI code
  (c) Copyright 2004 - 2010  BearOso

  Win32 GUI code
  (c) Copyright 2003 - 2006  blip,
                             funkyass,
                             Matthew Kendora,
                             Nach,
                             nitsuja
  (c) Copyright 2009 - 2010  OV2

  Mac OS GUI code
  (c) Copyright 1998 - 2001  John Stiles
  (c) Copyright 2001 - 2010  zones


  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/or 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 or it's derivatives.

  Snes9x is freeware for PERSONAL USE only. Commercial users should
  seek permission of the copyright holders first. Commercial use includes,
  but is not limited to, charging money for Snes9x or software derived from
  Snes9x, including Snes9x or derivatives in commercial game bundles, and/or
  using Snes9x as a promotion for your commercial product.

  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 <ctype.h>
#include <stdlib.h>
#include <string.h>

#include "snes9x.h"
#include "memmap.h"
#include "getset.h"
#include "apu.h"
#include "fxinst.h"
#include "fxemu.h"
#include "sdd1.h"
#include "srtc.h"
#include "controls.h"
#include "cheats.h"
#include "display.h"
#include "spc7110dec.h"

#ifdef __LIBRETRO__
#include "libretro.h"
void S9xAppendMapping(struct retro_memory_descriptor * desc);
#endif

#ifndef max
#define max(a, b) (((a) > (b)) ? (a) : (b))
#endif

#ifndef min
#define min(a, b) (((a) < (b)) ? (a) : (b))
#endif

static const uint32	crc32Table[256] =
{
	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
	0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
	0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
	0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
	0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
	0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
	0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
	0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
	0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
	0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
	0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
	0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
	0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
	0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
	0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
	0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
	0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
	0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
	0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
	0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
	0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
	0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
	0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
	0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
	0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
	0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
	0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
	0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
	0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
	0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
	0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
	0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
	0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
	0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
	0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
	0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
	0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
	0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
	0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
	0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
	0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
	0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
	0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
};

/* deinterleave*/

static void S9xDeinterleaveType1 (int size, uint8 *base)
{
	uint8 *tmp;
	uint8	blocks[256], b;
	int nblocks;
	int	i, j;
	
	nblocks = size >> 16;

	for ( i = 0; i < nblocks; i++)
	{
		blocks[i * 2] = i + nblocks;
		blocks[i * 2 + 1] = i;
	}

	tmp = (uint8 *) malloc(0x8000);
	if (tmp)
	{
		for ( i = 0; i < nblocks * 2; i++)
		{
			for ( j = i; j < nblocks * 2; j++)
			{
				if (blocks[j] == i)
				{
					memmove(tmp, &base[blocks[j] * 0x8000], 0x8000);
					memmove(&base[blocks[j] * 0x8000], &base[blocks[i] * 0x8000], 0x8000);
					memmove(&base[blocks[i] * 0x8000], tmp, 0x8000);
					b = blocks[j];
					blocks[j] = blocks[i];
					blocks[i] = b;
					break;
				}
			}
		}

		free(tmp);
	}
}

static void S9xDeinterleaveType2 (int size, uint8 *base)
{
	/* for odd Super FX images */
	uint8 *tmp;
	uint8	blocks[256], b;
	int nblocks, step, i, j;

	nblocks = size >> 16;
	step = 64;

	while (nblocks <= step)
		step >>= 1;
	nblocks = step;

	for ( i = 0; i < nblocks * 2; i++)
		blocks[i] = (i & ~0xf) | ((i & 3) << 2) | ((i & 12) >> 2);

	tmp = (uint8 *) malloc(0x10000);
	if (tmp)
	{
		for ( i = 0; i < nblocks * 2; i++)
		{
			for ( j = i; j < nblocks * 2; j++)
			{
				if (blocks[j] == i)
				{
					memmove(tmp, &base[blocks[j] * 0x10000], 0x10000);
					memmove(&base[blocks[j] * 0x10000], &base[blocks[i] * 0x10000], 0x10000);
					memmove(&base[blocks[i] * 0x10000], tmp, 0x10000);
					b = blocks[j];
					blocks[j] = blocks[i];
					blocks[i] = b;
					break;
				}
			}
		}

		free(tmp);
	}
}

static void S9xDeinterleaveGD24 (int size, uint8 *base)
{
	uint8 *tmp;
	/* for 24Mbit images dumped with Game Doctor */
	if (size != 0x300000)
		return;

	tmp = (uint8 *) malloc(0x80000);
	if (tmp)
	{
		memmove(tmp, &base[0x180000], 0x80000);
		memmove(&base[0x180000], &base[0x200000], 0x80000);
		memmove(&base[0x200000], &base[0x280000], 0x80000);
		memmove(&base[0x280000], tmp, 0x80000);

		free(tmp);

		S9xDeinterleaveType1(size, base);
	}
}

/* allocation and deallocation */

bool8 Init (void)
{
	Memory.RAM	 = (uint8 *) malloc(0x20000);
	Memory.SRAM = (uint8 *) malloc(0x20000);
	Memory.VRAM = (uint8 *) malloc(0x10000);
	Memory.ROM  = (uint8 *) malloc(MAX_ROM_SIZE + 0x200 + 0x8000);

	IPPU.TileCache[TILE_2BIT]       = (uint8 *) malloc(MAX_2BIT_TILES * 64);
	IPPU.TileCache[TILE_4BIT]       = (uint8 *) malloc(MAX_4BIT_TILES * 64);
	IPPU.TileCache[TILE_8BIT]       = (uint8 *) malloc(MAX_8BIT_TILES * 64);
	IPPU.TileCache[TILE_2BIT_EVEN]  = (uint8 *) malloc(MAX_2BIT_TILES * 64);
	IPPU.TileCache[TILE_2BIT_ODD]   = (uint8 *) malloc(MAX_2BIT_TILES * 64);
	IPPU.TileCache[TILE_4BIT_EVEN]  = (uint8 *) malloc(MAX_4BIT_TILES * 64);
	IPPU.TileCache[TILE_4BIT_ODD]   = (uint8 *) malloc(MAX_4BIT_TILES * 64);

	IPPU.TileCached[TILE_2BIT]      = (uint8 *) malloc(MAX_2BIT_TILES);
	IPPU.TileCached[TILE_4BIT]      = (uint8 *) malloc(MAX_4BIT_TILES);
	IPPU.TileCached[TILE_8BIT]      = (uint8 *) malloc(MAX_8BIT_TILES);
	IPPU.TileCached[TILE_2BIT_EVEN] = (uint8 *) malloc(MAX_2BIT_TILES);
	IPPU.TileCached[TILE_2BIT_ODD]  = (uint8 *) malloc(MAX_2BIT_TILES);
	IPPU.TileCached[TILE_4BIT_EVEN] = (uint8 *) malloc(MAX_4BIT_TILES);
	IPPU.TileCached[TILE_4BIT_ODD]  = (uint8 *) malloc(MAX_4BIT_TILES);


	/* don't render subscreen speed hack - disable this by default by 
	turning the variable (RenderSub - opposite of don't render sub) on */

	PPU.RenderSub = TRUE;
	PPU.FullClipping = TRUE;
	coldata_update_screen = TRUE;

	if (!Memory.RAM || !Memory.SRAM || !Memory.VRAM || !Memory.ROM ||
			!IPPU.TileCache[TILE_2BIT]       ||
			!IPPU.TileCache[TILE_4BIT]       ||
			!IPPU.TileCache[TILE_8BIT]       ||
			!IPPU.TileCache[TILE_2BIT_EVEN]  ||
			!IPPU.TileCache[TILE_2BIT_ODD]   ||
			!IPPU.TileCache[TILE_4BIT_EVEN]  ||
			!IPPU.TileCache[TILE_4BIT_ODD]   ||
			!IPPU.TileCached[TILE_2BIT]      ||
			!IPPU.TileCached[TILE_4BIT]      ||
			!IPPU.TileCached[TILE_8BIT]      ||
			!IPPU.TileCached[TILE_2BIT_EVEN] ||
			!IPPU.TileCached[TILE_2BIT_ODD]  ||
			!IPPU.TileCached[TILE_4BIT_EVEN] ||
			!IPPU.TileCached[TILE_4BIT_ODD])
	{
		Deinit();
		return (FALSE);
	}

	memset(Memory.RAM, 0,  0x20000);
	memset(Memory.SRAM, 0, 0x20000);
	memset(Memory.VRAM, 0, 0x10000);
	memset(Memory.ROM, 0,  MAX_ROM_SIZE + 0x200 + 0x8000);

	memset(IPPU.TileCache[TILE_2BIT], 0, MAX_2BIT_TILES * 64);
	memset(IPPU.TileCache[TILE_4BIT], 0, MAX_4BIT_TILES * 64);
	memset(IPPU.TileCache[TILE_8BIT], 0, MAX_8BIT_TILES * 64);
	memset(IPPU.TileCache[TILE_2BIT_EVEN], 0,  MAX_2BIT_TILES * 64);
	memset(IPPU.TileCache[TILE_2BIT_ODD], 0,   MAX_2BIT_TILES * 64);
	memset(IPPU.TileCache[TILE_4BIT_EVEN], 0,  MAX_4BIT_TILES * 64);
	memset(IPPU.TileCache[TILE_4BIT_ODD], 0,   MAX_4BIT_TILES * 64);

	memset(IPPU.TileCached[TILE_2BIT], 0,      MAX_2BIT_TILES);
	memset(IPPU.TileCached[TILE_4BIT], 0,      MAX_4BIT_TILES);
	memset(IPPU.TileCached[TILE_8BIT], 0,      MAX_8BIT_TILES);
	memset(IPPU.TileCached[TILE_2BIT_EVEN], 0, MAX_2BIT_TILES);
	memset(IPPU.TileCached[TILE_2BIT_ODD], 0,  MAX_2BIT_TILES);
	memset(IPPU.TileCached[TILE_4BIT_EVEN], 0, MAX_4BIT_TILES);
	memset(IPPU.TileCached[TILE_4BIT_ODD], 0,  MAX_4BIT_TILES);

	/* FillRAM uses first 32K of ROM image area, otherwise space just
	wasted. Might be read by the SuperFX code. */

	Memory.FillRAM = Memory.ROM;

	/* Add 0x8000 to ROM image pointer to stop SuperFX code accessing
	unallocated memory (can cause crash on some ports). */

	Memory.ROM += 0x8000;

	Memory.C4RAM   = Memory.ROM + 0x400000 + 8192 * 8; /* C4 */
	Memory.OBC1RAM = Memory.ROM + 0x400000; /* OBC1 */
	Memory.BIOSROM = Memory.ROM + 0x300000; /* BS */
	Memory.BSRAM   = Memory.ROM + 0x400000; /* BS */

	SuperFX.pvRegisters = Memory.FillRAM + 0x3000;
	SuperFX.nRamBanks   = 2; /* Most only use 1.  1=64KB=512Mb, 2=128KB=1024Mb */
	SuperFX.pvRam       = Memory.SRAM;
	SuperFX.nRomBanks   = (2 * 1024 * 1024) / (32 * 1024);
	SuperFX.pvRom       = (uint8 *) Memory.ROM;

	return (TRUE);
}

static char * Safe (const char *s)
{
	static char	*safe = NULL;
	static int	safe_len = 0;
	int		i, len;

	if (s == NULL)
	{
		if (safe)
		{
			free(safe);
			safe = NULL;
		}

		return (NULL);
	}

	len = strlen(s);
	if (!safe || len + 1 > safe_len)
	{
		if (safe)
			free(safe);

		safe_len = len + 1;
		safe = (char *) malloc(safe_len);
	}

	for ( i = 0; i < len; i++)
	{
		if (s[i] >= 32 && s[i] < 127)
			safe[i] = s[i];
		else
			safe[i] = '_';
	}

	safe[len] = 0;

	return (safe);
}

static char * SafeANK (uint8 ROMRegion, const char *s)
{
	static char	*safe = NULL;
	static int	safe_len = 0;
	int		i, len;

	if (s == NULL)
	{
		if (safe)
		{
			free(safe);
			safe = NULL;
		}

		return (NULL);
	}

	len = strlen(s);
	if (!safe || len + 1 > safe_len)
	{
		if (safe)
			free(safe);

		safe_len = len + 1;
		safe = (char *) malloc(safe_len);
	}

	for ( i = 0; i < len; i++)
	{
		if (s[i] >= 32 && s[i] < 127) /* ASCII */
			safe [i] = s[i];
		else
		if (ROMRegion == 0 && ((uint8) s[i] >= 0xa0 && (uint8) s[i] < 0xe0)) /* JIS X 201 - Katakana */
			safe [i] = s[i];
		else
			safe [i] = '_';
	}

	safe [len] = 0;

	return (safe);
}

void Deinit (void)
{
	int t;
	if (Memory.RAM)
	{
		free(Memory.RAM);
		Memory.RAM = NULL;
	}

	if (Memory.SRAM)
	{
		free(Memory.SRAM);
		Memory.SRAM = NULL;
	}

	if (Memory.VRAM)
	{
		free(Memory.VRAM);
		Memory.VRAM = NULL;
	}

	if (Memory.ROM)
	{
		Memory.ROM -= 0x8000;
		free(Memory.ROM);
		Memory.ROM = NULL;
	}

	if(Settings.SPC7110 || Settings.SPC7110RTC)
	{
		S9xFreeSPC7110();
	}

	for ( t = 0; t < 7; t++)
	{
		if (IPPU.TileCache[t])
		{
			free(IPPU.TileCache[t]);
			IPPU.TileCache[t] = NULL;
		}

		if (IPPU.TileCached[t])
		{
			free(IPPU.TileCached[t]);
			IPPU.TileCached[t] = NULL;
		}
	}

	Safe(NULL);
	SafeANK(Memory.ROMRegion, NULL);
}

/* file management and ROM detection */

static bool8 allASCII (uint8 *b, int size)
{
	int i;
	for ( i = 0; i < size; i++)
	{
		if (b[i] < 32 || b[i] > 126)
			return (FALSE);
	}

	return (TRUE);
}

static bool8 is_SufamiTurbo_BIOS (uint8 *data, uint32 size)
{
	if (size == 0x40000 && strncmp((char *) data, "BANDAI SFC-ADX", 14) == 0
	&& strncmp((char * ) (data + 0x10), "SFC-ADX BACKUP", 14) == 0)
		return TRUE;
	else
		return FALSE;
}

static bool8 is_SufamiTurbo_Cart (uint8 *data, uint32 size)
{
	if (size >= 0x80000 && size <= 0x100000 && strncmp((char *) data, "BANDAI SFC-ADX", 14) == 0
	&& strncmp((char * ) (data + 0x10), "SFC-ADX BACKUP", 14) != 0)
		return TRUE;
	else
		return FALSE;
}

static bool8 is_SameGame_BIOS (uint8 *data, uint32 size)
{
	if (size == 0x100000 && strncmp((char *) (data + 0xffc0), "Same Game Tsume Game", 20) == 0)
		return (TRUE);
	else
		return (FALSE);
}

static bool8 is_SameGame_Add_On (uint8 *data, uint32 size)
{
	if (size == 0x80000)
		return (TRUE);
	else
		return (FALSE);
}

static int ScoreHiROM (uint32 calculated_size, uint8 * rom,  bool8 skip_header, int32 romoff)
{
	uint8	*buf;
	int score;

	score = 0;
	buf = rom + 0xff00 + romoff + (skip_header ? 0x200 : 0);

	if (buf[0xd5] & 0x1)
		score += 2;

	/* Mode23 is SA-1 */
	if (buf[0xd5] == 0x23)
		score -= 2;

	if (buf[0xd4] == 0x20)
		score += 2;

	if ((buf[0xdc] + (buf[0xdd] << 8)) + (buf[0xde] + (buf[0xdf] << 8)) == 0xffff)
	{
		score += 2;
		if (0 != (buf[0xde] + (buf[0xdf] << 8)))
			score++;
	}

	if (buf[0xda] == 0x33)
		score += 2;

	if ((buf[0xd5] & 0xf) < 4)
		score += 2;

	if (!(buf[0xfd] & 0x80))
		score -= 6;

	if ((buf[0xfc] + (buf[0xfd] << 8)) > 0xffb0)
		score -= 2; /* reduced after looking at a scan by Cowering */

	if (calculated_size > 1024 * 1024 * 3)
		score += 4;

	if ((1 << (buf[0xd7] - 7)) > 48)
		score -= 1;

	if (!allASCII(&buf[0xb0], 6))
		score -= 1;

	if (!allASCII(&buf[0xc0], ROM_NAME_LEN - 1))
		score -= 1;

	return (score);
}

static int ScoreLoROM (uint32 calculated_size, uint8 * rom, bool8 skip_header, int32 romoff)
{
	uint8	*buf;
	int score;

	score = 0;
	buf = rom + 0x7f00 + romoff + (skip_header ? 0x200 : 0);

	if (!(buf[0xd5] & 0x1))
		score += 3;

	/* Mode23 is SA-1 */
	if (buf[0xd5] == 0x23)
		score += 2;

	if ((buf[0xdc] + (buf[0xdd] << 8)) + (buf[0xde] + (buf[0xdf] << 8)) == 0xffff)
	{
		score += 2;
		if (0 != (buf[0xde] + (buf[0xdf] << 8)))
			score++;
	}

	if (buf[0xda] == 0x33)
		score += 2;

	if ((buf[0xd5] & 0xf) < 4)
		score += 2;

	if (!(buf[0xfd] & 0x80))
		score -= 6;

	if ((buf[0xfc] + (buf[0xfd] << 8)) > 0xffb0)
		score -= 2; /* reduced per Cowering suggestion */

	if (calculated_size <= 1024 * 1024 * 16)
		score += 2;

	if ((1 << (buf[0xd7] - 7)) > 48)
		score -= 1;

	if (!allASCII(&buf[0xb0], 6))
		score -= 1;

	if (!allASCII(&buf[0xc0], ROM_NAME_LEN - 1))
		score -= 1;

	return (score);
}

uint32 HeaderRemove (uint32 size, int32 * headerCount, uint8 *buf)
{
	uint32 calc_size;

	calc_size = (size / 0x2000) * 0x2000;

	if (size - calc_size == 512)
	{
		memmove(buf, buf + 512, calc_size);
		*(headerCount)++;
		size -= 512;
	}

	return (size);
}

static uint32 FileLoader (uint8 *buffer, const char *filename, int32 maxsize)
{
	/* <- ROM size without header */
	/* ** Memory.HeaderCount */
	/* ** Memory.ROMFilename */

	bool8	more;
	int32	totalSize;
	uint32	size;
	char	fname[PATH_MAX + 1], drive[_MAX_DRIVE + 1], dir[PATH_MAX + 1], name[PATH_MAX + 1], exts[PATH_MAX + 1];
	char	*ext;
	int	len;
	uint8	*ptr;
	STREAM	fp;

	totalSize = 0;

	ext = &exts[0];

	Memory.HeaderCount = 0;

	_splitpath(filename, drive, dir, name, exts);
	_makepath(fname, drive, dir, name, exts);

	fp = OPEN_STREAM(fname, "rb");
	if (!fp)
		return (0);

	strcpy(Memory.ROMFilename, fname);

	len  = 0;
	size = 0;
	more = FALSE;
	ptr = buffer;

	do
	{
		size = READ_STREAM(ptr, maxsize + 0x200 - (ptr - buffer), fp);
		CLOSE_STREAM(fp);

		size = HeaderRemove(size, &Memory.HeaderCount, ptr);
		totalSize += size;
		ptr += size;

		/* check for multi file roms*/
		if (ptr - buffer < maxsize + 0x200 &&
				(isdigit(ext[0]) && ext[1] == 0 && ext[0] < '9'))
		{
			more = TRUE;
			ext[0]++;
			_makepath(fname, drive, dir, name, exts);
		}
		else
			if (ptr - buffer < maxsize + 0x200 &&
					(((len = strlen(name)) == 7 || len == 8) &&
						strncasecmp(name, "sf", 2) == 0 &&
						isdigit(name[2]) && isdigit(name[3]) && isdigit(name[4]) && isdigit(name[5]) &&
						isalpha(name[len - 1])))
			{
				more = TRUE;
				name[len - 1]++;
				_makepath(fname, drive, dir, name, exts);
			}
			else
				more = FALSE;

	}	while (more && (fp = OPEN_STREAM(fname, "rb")) != NULL);

	if (Memory.HeaderCount == 0)
		S9xMessage(S9X_INFO, S9X_HEADERS_INFO, "No ROM file header found.");
	else
		if (Memory.HeaderCount == 1)
			S9xMessage(S9X_INFO, S9X_HEADERS_INFO, "Found ROM file header (and ignored it).");
		else
			S9xMessage(S9X_INFO, S9X_HEADERS_INFO, "Found multiple ROM file headers (and ignored them).");

	return ((uint32) totalSize);
}

static uint32 caCRC32 (uint8 *array, uint32 size, uint32 crc32)
{
	uint32 i;

	for ( i = 0; i < size; i++)
		crc32 = ((crc32 >> 8) & 0x00FFFFFF) ^ crc32Table[(crc32 ^ array[i]) & 0xFF];

	return (~crc32);
}

bool8 LoadROM (const char *filename)
{
	int	hi_score, lo_score, retry_count;
	bool8 interleaved, tales;
	uint8 * RomHeader;
	int32 totalFileSize;

	retry_count = 0;

	if (!filename)
		return FALSE;

	memset(Memory.ROM, 0, MAX_ROM_SIZE);
	memset(&Multi, 0, sizeof(Multi));

again:
	Memory.CalculatedSize = 0;
	Memory.ExtendedFormat = NOPE;

	totalFileSize = FileLoader(Memory.ROM, filename, MAX_ROM_SIZE);
	if (!totalFileSize)
		return FALSE;

	hi_score = ScoreHiROM(Memory.CalculatedSize, Memory.ROM, FALSE, 0);
	lo_score = ScoreLoROM(Memory.CalculatedSize, Memory.ROM, FALSE, 0);

	if (Memory.HeaderCount == 0 && !Settings.ForceNoHeader &&
		((hi_score >  lo_score && ScoreHiROM(Memory.CalculatedSize, Memory.ROM, TRUE, 0) > hi_score) ||
		 (hi_score <= lo_score && ScoreLoROM(Memory.CalculatedSize, Memory.ROM, TRUE, 0) > lo_score)))
	{
		memmove(Memory.ROM, Memory.ROM + 512, totalFileSize - 512);
		totalFileSize -= 512;
		S9xMessage(S9X_INFO, S9X_HEADER_WARNING, "Try 'force no-header' option if the game doesn't work");
		/* modifying ROM, so we need to rescore */
		hi_score = ScoreHiROM(Memory.CalculatedSize, Memory.ROM, FALSE, 0);
		lo_score = ScoreLoROM(Memory.CalculatedSize, Memory.ROM, FALSE, 0);
	}

	Memory.CalculatedSize = (totalFileSize / 0x2000) * 0x2000;

	if (Memory.CalculatedSize > 0x400000 &&
		(Memory.ROM[0x7fd5] + (Memory.ROM[0x7fd6] << 8)) != 0x4332 && /* exclude S-DD1 */
		(Memory.ROM[0x7fd5] + (Memory.ROM[0x7fd6] << 8)) != 0x4532 &&
		(Memory.ROM[0xffd5] + (Memory.ROM[0xffd6] << 8)) != 0xF93a && /* exclude SPC7110 */
		(Memory.ROM[0xffd5] + (Memory.ROM[0xffd6] << 8)) != 0xF53a)
		Memory.ExtendedFormat = YEAH;

	/* if both vectors are invalid, it's type 1 interleaved LoROM */
	if (Memory.ExtendedFormat == NOPE &&
		((Memory.ROM[0x7ffc] + (Memory.ROM[0x7ffd] << 8)) < 0x8000) &&
		((Memory.ROM[0xfffc] + (Memory.ROM[0xfffd] << 8)) < 0x8000))
	{
		if (!Settings.ForceInterleaved && !Settings.ForceNotInterleaved)
			S9xDeinterleaveType1(totalFileSize, Memory.ROM);
	}

	/* CalculatedSize is now set, so rescore */
	hi_score = ScoreHiROM(Memory.CalculatedSize, Memory.ROM, FALSE, 0);
	lo_score = ScoreLoROM(Memory.CalculatedSize, Memory.ROM, FALSE, 0);

	RomHeader = Memory.ROM;

	if (Memory.ExtendedFormat != NOPE)
	{
		int	swappedhirom, swappedlorom;

		swappedhirom = ScoreHiROM(Memory.CalculatedSize, Memory.ROM, FALSE, 0x400000);
		swappedlorom = ScoreLoROM(Memory.CalculatedSize, Memory.ROM, FALSE, 0x400000);

		/* set swapped here */
		if (max(swappedlorom, swappedhirom) >= max(lo_score, hi_score))
		{
			Memory.ExtendedFormat = BIGFIRST;
			hi_score = swappedhirom;
			lo_score = swappedlorom;
			RomHeader += 0x400000;
		}
		else
			Memory.ExtendedFormat = SMALLFIRST;
	}

	interleaved = FALSE;
	tales = FALSE;

	interleaved = Settings.ForceInterleaved || Settings.ForceInterleaved2 || Settings.ForceInterleaveGD24;

	if (Settings.ForceLoROM || (!Settings.ForceHiROM && lo_score >= hi_score))
	{
		Memory.LoROM = TRUE;
		Memory.HiROM = FALSE;

		/* ignore map type byte if not 0x2x or 0x3x */
		if ((RomHeader[0x7fd5] & 0xf0) == 0x20 || (RomHeader[0x7fd5] & 0xf0) == 0x30)
		{
			switch (RomHeader[0x7fd5] & 0xf)
			{
				case 1:
					interleaved = TRUE;
					break;

				case 5:
					interleaved = TRUE;
					tales = TRUE;
					break;
			}
		}
	}
	else
	{
		Memory.LoROM = FALSE;
		Memory.HiROM = TRUE;

		if ((RomHeader[0xffd5] & 0xf0) == 0x20 || (RomHeader[0xffd5] & 0xf0) == 0x30)
		{
			switch (RomHeader[0xffd5] & 0xf)
			{
				case 0:
				case 3:
					interleaved = TRUE;
					break;
			}
		}
	}

	/* these two games fail to be detected otherwise */
	if (!Settings.ForceHiROM && !Settings.ForceLoROM)
	{
		if (strncmp((char *) &Memory.ROM[0x7fc0], "YUYU NO QUIZ DE GO!GO!", 22) == 0 ||
		   (strncmp((char *) &Memory.ROM[0xffc0], "BATMAN--REVENGE JOKER",  21) == 0))
		{
			Memory.LoROM = TRUE;
			Memory.HiROM = FALSE;
			interleaved = FALSE;
			tales = FALSE;
		}
	}

	if (!Settings.ForceNotInterleaved && interleaved)
	{
		S9xMessage(S9X_INFO, S9X_ROM_INTERLEAVED_INFO, "ROM image is in interleaved format - converting...");

		if (tales)
		{
			if (Memory.ExtendedFormat == BIGFIRST)
			{
				S9xDeinterleaveType1(0x400000, Memory.ROM);
				S9xDeinterleaveType1(Memory.CalculatedSize - 0x400000, Memory.ROM + 0x400000);
			}
			else
			{
				S9xDeinterleaveType1(Memory.CalculatedSize - 0x400000, Memory.ROM);
				S9xDeinterleaveType1(0x400000, Memory.ROM + Memory.CalculatedSize - 0x400000);
			}

			Memory.LoROM = FALSE;
			Memory.HiROM = TRUE;
		}
		else
		if (Settings.ForceInterleaveGD24 && Memory.CalculatedSize == 0x300000)
		{
			bool8	t = Memory.LoROM;
			Memory.LoROM = Memory.HiROM;
			Memory.HiROM = t;
			S9xDeinterleaveGD24(Memory.CalculatedSize, Memory.ROM);
		}
		else
		if (Settings.ForceInterleaved2)
			S9xDeinterleaveType2(Memory.CalculatedSize, Memory.ROM);
		else
		{
			bool8	t = Memory.LoROM;
			Memory.LoROM = Memory.HiROM;
			Memory.HiROM = t;
			S9xDeinterleaveType1(Memory.CalculatedSize, Memory.ROM);
		}

		hi_score = ScoreHiROM(Memory.CalculatedSize, Memory.ROM, FALSE, 0);
		lo_score = ScoreLoROM(Memory.CalculatedSize, Memory.ROM, FALSE, 0);

		if ((Memory.HiROM && (lo_score >= hi_score || hi_score < 0)) ||
			(Memory.LoROM && (hi_score >  lo_score || lo_score < 0)))
		{
			if (retry_count == 0)
			{
				S9xMessage(S9X_INFO, S9X_ROM_CONFUSING_FORMAT_INFO, "ROM lied about its type! Trying again.");
				Settings.ForceNotInterleaved = TRUE;
				Settings.ForceInterleaved = FALSE;
				retry_count++;
				goto again;
			}
		}
    }

	if (Memory.ExtendedFormat == SMALLFIRST)
		tales = TRUE;

	if (tales)
	{
		uint8	*tmp = (uint8 *) malloc(Memory.CalculatedSize - 0x400000);
		if (tmp)
		{
			S9xMessage(S9X_INFO, S9X_ROM_INTERLEAVED_INFO, "Fixing swapped ExHiROM...");
			memmove(tmp, Memory.ROM, Memory.CalculatedSize - 0x400000);
			memmove(Memory.ROM, Memory.ROM + Memory.CalculatedSize - 0x400000, 0x400000);
			memmove(Memory.ROM + 0x400000, tmp, Memory.CalculatedSize - 0x400000);
			free(tmp);
		}
	}

	memset(&SNESGameFixes, 0, sizeof(SNESGameFixes));
	SNESGameFixes.SRAMInitialValue = 0x60;

	S9xLoadCheatFile(S9xGetFilename(".cht", CHEAT_DIR));

	InitROM();

	S9xInitCheatData();
	S9xApplyCheats();

	S9xReset();

    return (TRUE);
}

bool8 LoadMultiCart (const char *cartA, const char *cartB)
{
	bool8 r;

	r = TRUE;

	memset(Memory.ROM, 0, MAX_ROM_SIZE);
	memset(&Multi, 0, sizeof(Multi));

	Memory.CalculatedSize = 0;
	Memory.ExtendedFormat = NOPE;

	if (cartA && cartA[0])
		Multi.cartSizeA = FileLoader(Memory.ROM, cartA, MAX_ROM_SIZE);

	if (Multi.cartSizeA == 0)
	{
		if (cartB && cartB[0])
			Multi.cartSizeB = FileLoader(Memory.ROM, cartB, MAX_ROM_SIZE);
	}

	if (Multi.cartSizeA)
	{
		if (is_SufamiTurbo_Cart(Memory.ROM, Multi.cartSizeA))
			Multi.cartType = 4;
		else
		if (is_SameGame_BIOS(Memory.ROM, Multi.cartSizeA))
			Multi.cartType = 3;
	}
	else
	if (Multi.cartSizeB)
	{
		if (is_SufamiTurbo_Cart(Memory.ROM, Multi.cartSizeB))
			Multi.cartType = 4;
	}
	else
		Multi.cartType = 4; /* assuming BIOS only */

	switch (Multi.cartType)
	{
		case 4:
			r = LoadSufamiTurbo(cartA, cartB);
			break;

		case 3:
			r = LoadSameGame(cartA, cartB);
			break;

		default:
			r = FALSE;
	}

	if (!r)
	{
		memset(&Multi, 0, sizeof(Multi));
		return (FALSE);
	}

	memset(&SNESGameFixes, 0, sizeof(SNESGameFixes));
	SNESGameFixes.SRAMInitialValue = 0x60;

	S9xLoadCheatFile(S9xGetFilename(".cht", CHEAT_DIR));

	InitROM();

	S9xInitCheatData();
	S9xApplyCheats();