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snes9x/cheats2.cpp

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/*****************************************************************************\
Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
This file is licensed under the Snes9x License.
For further information, consult the LICENSE file in the root directory.
\*****************************************************************************/
#include <ctype.h>
#include "snes9x.h"
#include "memmap.h"
#include "cheats.h"
#include "bml.h"
static inline char *trim (char *string)
{
int start;
int end;
for (start = 0; string[start] && isspace (string[start]); start++) {}
for (end = start; string[end] && !isspace (string[end]); end++) {}
string[end] = '\0';
return &string[start];
}
static inline uint8 S9xGetByteFree (uint32 Address)
{
int block = (Address & 0xffffff) >> MEMMAP_SHIFT;
uint8 *GetAddress = Memory.Map[block];
uint8 byte;
if (GetAddress >= (uint8 *) CMemory::MAP_LAST)
{
byte = *(GetAddress + (Address & 0xffff));
return (byte);
}
switch ((pint) GetAddress)
{
case CMemory::MAP_CPU:
byte = S9xGetCPU(Address & 0xffff);
return (byte);
case CMemory::MAP_PPU:
if (CPU.InDMAorHDMA && (Address & 0xff00) == 0x2100)
return (OpenBus);
byte = S9xGetPPU(Address & 0xffff);
return (byte);
case CMemory::MAP_LOROM_SRAM:
case CMemory::MAP_SA1RAM:
// Address & 0x7fff : offset into bank
// Address & 0xff0000 : bank
// bank >> 1 | offset : SRAM address, unbound
// unbound & SRAMMask : SRAM offset
byte = *(Memory.SRAM + ((((Address & 0xff0000) >> 1) | (Address & 0x7fff)) & Memory.SRAMMask));
return (byte);
case CMemory::MAP_LOROM_SRAM_B:
byte = *(Multi.sramB + ((((Address & 0xff0000) >> 1) | (Address & 0x7fff)) & Multi.sramMaskB));
return (byte);
case CMemory::MAP_HIROM_SRAM:
case CMemory::MAP_RONLY_SRAM:
byte = *(Memory.SRAM + (((Address & 0x7fff) - 0x6000 + ((Address & 0x1f0000) >> 3)) & Memory.SRAMMask));
return (byte);
case CMemory::MAP_BWRAM:
byte = *(Memory.BWRAM + ((Address & 0x7fff) - 0x6000));
return (byte);
case CMemory::MAP_DSP:
byte = S9xGetDSP(Address & 0xffff);
return (byte);
case CMemory::MAP_SPC7110_ROM:
byte = S9xGetSPC7110Byte(Address);
return (byte);
case CMemory::MAP_SPC7110_DRAM:
byte = S9xGetSPC7110(0x4800);
return (byte);
case CMemory::MAP_C4:
byte = S9xGetC4(Address & 0xffff);
return (byte);
case CMemory::MAP_OBC_RAM:
byte = S9xGetOBC1(Address & 0xffff);
return (byte);
case CMemory::MAP_SETA_DSP:
byte = S9xGetSetaDSP(Address);
return (byte);
case CMemory::MAP_SETA_RISC:
byte = S9xGetST018(Address);
return (byte);
case CMemory::MAP_BSX:
byte = S9xGetBSX(Address);
return (byte);
case CMemory::MAP_NONE:
default:
byte = OpenBus;
return (byte);
}
}
static inline void S9xSetByteFree (uint8 Byte, uint32 Address)
{
int block = (Address & 0xffffff) >> MEMMAP_SHIFT;
uint8 *SetAddress = Memory.Map[block];
if (SetAddress >= (uint8 *) CMemory::MAP_LAST)
{
*(SetAddress + (Address & 0xffff)) = Byte;
return;
}
switch ((pint) SetAddress)
{
case CMemory::MAP_CPU:
S9xSetCPU(Byte, Address & 0xffff);
return;
case CMemory::MAP_PPU:
if (CPU.InDMAorHDMA && (Address & 0xff00) == 0x2100)
return;
S9xSetPPU(Byte, Address & 0xffff);
return;
case CMemory::MAP_LOROM_SRAM:
if (Memory.SRAMMask)
{
*(Memory.SRAM + ((((Address & 0xff0000) >> 1) | (Address & 0x7fff)) & Memory.SRAMMask)) = Byte;
CPU.SRAMModified = TRUE;
}
return;
case CMemory::MAP_LOROM_SRAM_B:
if (Multi.sramMaskB)
{
*(Multi.sramB + ((((Address & 0xff0000) >> 1) | (Address & 0x7fff)) & Multi.sramMaskB)) = Byte;
CPU.SRAMModified = TRUE;
}
return;
case CMemory::MAP_HIROM_SRAM:
if (Memory.SRAMMask)
{
*(Memory.SRAM + (((Address & 0x7fff) - 0x6000 + ((Address & 0x1f0000) >> 3)) & Memory.SRAMMask)) = Byte;
CPU.SRAMModified = TRUE;
}
return;
case CMemory::MAP_BWRAM:
*(Memory.BWRAM + ((Address & 0x7fff) - 0x6000)) = Byte;
CPU.SRAMModified = TRUE;
return;
case CMemory::MAP_SA1RAM:
*(Memory.SRAM + (Address & 0xffff)) = Byte;
return;
case CMemory::MAP_DSP:
S9xSetDSP(Byte, Address & 0xffff);
return;
case CMemory::MAP_C4:
S9xSetC4(Byte, Address & 0xffff);
return;
case CMemory::MAP_OBC_RAM:
S9xSetOBC1(Byte, Address & 0xffff);
return;
case CMemory::MAP_SETA_DSP:
S9xSetSetaDSP(Byte, Address);
return;
case CMemory::MAP_SETA_RISC:
S9xSetST018(Byte, Address);
return;
case CMemory::MAP_BSX:
S9xSetBSX(Byte, Address);
return;
case CMemory::MAP_NONE:
default:
return;
}
}
void S9xInitWatchedAddress (void)
{
for (unsigned int i = 0; i < sizeof(watches) / sizeof(watches[0]); i++)
watches[i].on = false;
}
void S9xInitCheatData (void)
{
Cheat.RAM = Memory.RAM;
Cheat.SRAM = Memory.SRAM;
Cheat.FillRAM = Memory.FillRAM;
}
void S9xUpdateCheatInMemory (SCheat *c)
{
uint8 byte;
if (!c->enabled)
return;
byte = S9xGetByteFree (c->address);
if (byte != c->byte)
{
/* The game wrote a different byte to the address, update saved_byte */
c->saved_byte = byte;
if (c->conditional)
{
if (c->saved_byte != c->cond_byte && c->cond_true)
{
/* Condition is now false, let the byte stand */
c->cond_true = false;
}
else if (c->saved_byte == c->cond_byte && !c->cond_true)
{
c->cond_true = true;
S9xSetByteFree (c->byte, c->address);
}
}
else
S9xSetByteFree (c->byte, c->address);
}
else if (c->conditional)
{
if (byte == c->cond_byte)
{
c->cond_true = true;
c->saved_byte = byte;
S9xSetByteFree (c->byte, c->address);
}
}
}
void S9xDisableCheat (SCheat *c)
{
if (!c->enabled)
return;
if (!Cheat.enabled)
{
c->enabled = false;
return;
}
/* Make sure we restore the up-to-date written byte */
S9xUpdateCheatInMemory (c);
c->enabled = false;
if (c->conditional && !c->cond_true)
return;
S9xSetByteFree (c->saved_byte, c->address);
c->cond_true = false;
}
void S9xDeleteCheatGroup (uint32 g)
{
unsigned int i;
if (g >= Cheat.g.size ())
return;
for (i = 0; i < Cheat.g[g].c.size (); i++)
{
S9xDisableCheat (&Cheat.g[g].c[i]);
}
delete[] Cheat.g[g].name;
Cheat.g.erase (Cheat.g.begin () + g);
}
void S9xDeleteCheats (void)
{
unsigned int i;
for (i = 0; i < Cheat.g.size (); i++)
{
S9xDisableCheatGroup (i);
delete[] Cheat.g[i].name;
}
Cheat.g.clear ();
}
void S9xEnableCheat (SCheat *c)
{
uint8 byte;
if (c->enabled)
return;
c->enabled = true;
if (!Cheat.enabled)
return;
byte = S9xGetByteFree(c->address);
if (c->conditional)
{
if (byte != c->cond_byte)
return;
c->cond_true = true;
}
c->saved_byte = byte;
S9xSetByteFree (c->byte, c->address);
}
void S9xEnableCheatGroup (uint32 num)
{
unsigned int i;
for (i = 0; i < Cheat.g[num].c.size (); i++)
{
S9xEnableCheat (&Cheat.g[num].c[i]);
}
Cheat.g[num].enabled = true;
}
void S9xDisableCheatGroup (uint32 num)
{
unsigned int i;
for (i = 0; i < Cheat.g[num].c.size (); i++)
{
S9xDisableCheat (&Cheat.g[num].c[i]);
}
Cheat.g[num].enabled = false;
}
SCheat S9xTextToCheat (char *text)
{
SCheat c;
unsigned int byte = 0;
unsigned int cond_byte = 0;
c.enabled = false;
c.conditional = false;
if (!S9xGameGenieToRaw (text, c.address, c.byte))
{
byte = c.byte;
}
else if (!S9xProActionReplayToRaw (text, c.address, c.byte))
{
byte = c.byte;
}
else if (sscanf (text, "%x = %x ? %x", &c.address, &cond_byte, &byte) == 3)
{
c.conditional = true;
}
else if (sscanf (text, "%x = %x", &c.address, &byte) == 2)
{
}
else if (sscanf (text, "%x / %x / %x", &c.address, &cond_byte, &byte) == 3)
{
c.conditional = true;
}
else if (sscanf (text, "%x / %x", &c.address, &byte) == 2)
{
}
else
{
c.address = 0;
byte = 0;
}
c.byte = byte;
c.cond_byte = cond_byte;
return c;
}
SCheatGroup S9xCreateCheatGroup (const char *name, const char *cheat)
{
SCheatGroup g;
char *code_string = strdup (cheat);
char *code_ptr = code_string;
int len;
g.name = strdup (name);
g.enabled = false;
for (len = strcspn (code_ptr, "+"); len; len = strcspn (code_ptr, "+"))
{
char *code = code_ptr;
code_ptr += len + (code_ptr[len] == '\0' ? 0 : 1);
code[len] = '\0';
code = trim (code);
SCheat c = S9xTextToCheat (code);
if (c.address)
g.c.push_back (c);
}
free(code_string);
return g;
}
int S9xAddCheatGroup (const char *name, const char *cheat)
{
SCheatGroup g = S9xCreateCheatGroup (name, cheat);
if (g.c.size () == 0)
return -1;
Cheat.g.push_back (g);
return Cheat.g.size () - 1;
}
int S9xModifyCheatGroup (uint32 num, const char *name, const char *cheat)
{
if (num >= Cheat.g.size())
return -1;
S9xDisableCheatGroup (num);
delete[] Cheat.g[num].name;
Cheat.g[num] = S9xCreateCheatGroup (name, cheat);
return num;
}
char *S9xCheatToText (SCheat *c)
{
int size = 10; /* 6 address, 1 =, 2 byte, 1 NUL */
char *text;
if (c->conditional)
size += 3; /* additional 2 byte, 1 ? */
text = new char[size];
if (c->conditional)
snprintf (text, size, "%06x=%02x?%02x", c->address, c->cond_byte, c->byte);
else
snprintf (text, size, "%06x=%02x", c->address, c->byte);
return text;
}
char *S9xCheatGroupToText (SCheatGroup *g)
{
std::string text = "";
unsigned int i;
if (g->c.size () == 0)
return NULL;
for (i = 0; i < g->c.size (); i++)
{
char *tmp = S9xCheatToText (&g->c[i]);
if (i != 0)
text += " + ";
text += tmp;
delete[] tmp;
}
return strdup (text.c_str ());
}
char *S9xCheatValidate (const char *code_string)
{
SCheatGroup g = S9xCreateCheatGroup ("temp", code_string);
delete[] g.name;
if (g.c.size() > 0)
{
return S9xCheatGroupToText (&g);
}
return NULL;
}
char *S9xCheatGroupToText (uint32 num)
{
if (num >= Cheat.g.size ())
return NULL;
return S9xCheatGroupToText (&Cheat.g[num]);
}
void S9xUpdateCheatsInMemory (void)
{
unsigned int i;
unsigned int j;
if (!Cheat.enabled)
return;
for (i = 0; i < Cheat.g.size (); i++)
{
for (j = 0; j < Cheat.g[i].c.size (); j++)
{
S9xUpdateCheatInMemory (&Cheat.g[i].c[j]);
}
}
}
static int S9xCheatIsDuplicate (const char *name, const char *code)
{
unsigned int i;
for (i = 0; i < Cheat.g.size(); i++)
{
if (!strcmp (name, Cheat.g[i].name))
{
char *code_string = S9xCheatGroupToText (i);
char *validated = S9xCheatValidate (code);
if (validated && !strcmp (code_string, validated))
{
free (code_string);
free (validated);
return TRUE;
}
free (code_string);
free (validated);
}
}
return FALSE;
}
static void S9xLoadCheatsFromBMLNode (bml_node *n)
{
unsigned int i;
for (i = 0; i < n->child.size (); i++)
{
if (!strcasecmp (n->child[i].name.c_str(), "cheat"))
{
const char *desc = NULL;
const char *code = NULL;
bool8 enabled = false;
bml_node *c = &n->child[i];
bml_node *tmp = NULL;
tmp = c->find_subnode("name");
if (!tmp)
desc = (char *) "";
else
desc = tmp->data.c_str();
tmp = c->find_subnode("code");
if (tmp)
code = tmp->data.c_str();
if (c->find_subnode("enable"))
enabled = true;
if (code && !S9xCheatIsDuplicate (desc, code))
{
int index = S9xAddCheatGroup (desc, code);
if (enabled)
S9xEnableCheatGroup (index);
}
}
}
return;
}
static bool8 S9xLoadCheatFileClassic (const char *filename)
{
FILE *fs;
uint8 data[28];
fs = fopen(filename, "rb");
if (!fs)
return (FALSE);
while (fread ((void *) data, 1, 28, fs) == 28)
{
SCheat c;
char name[21];
char cheat[10];
c.enabled = (data[0] & 4) == 0;
c.byte = data[1];
c.address = data[2] | (data[3] << 8) | (data[4] << 16);
memcpy (name, &data[8], 20);
name[20] = 0;
snprintf (cheat, 10, "%x=%x", c.address, c.byte);
S9xAddCheatGroup (name, cheat);
if (c.enabled)
S9xEnableCheatGroup (Cheat.g.size () - 1);
}
fclose(fs);
return (TRUE);
}
bool8 S9xLoadCheatFile (const char *filename)
{
bml_node bml;
if (!bml.parse_file(filename))
{
return S9xLoadCheatFileClassic (filename);
}
bml_node *n = bml.find_subnode("cheat");
if (n)
{
S9xLoadCheatsFromBMLNode (&bml);
}
if (!n)
{
return S9xLoadCheatFileClassic (filename);
}
return (TRUE);
}
bool8 S9xSaveCheatFile (const char *filename)
{
unsigned int i;
FILE *file = NULL;
if (Cheat.g.size () == 0)
{
remove (filename);
return TRUE;
}
file = fopen (filename, "w");
if (!file)
return FALSE;
for (i = 0; i < Cheat.g.size (); i++)
{
char *txt = S9xCheatGroupToText (i);
fprintf (file,
"cheat\n"
" name: %s\n"
" code: %s\n"
"%s\n",
Cheat.g[i].name ? Cheat.g[i].name : "",
txt,
Cheat.g[i].enabled ? " enable\n" : ""
);
delete[] txt;
}
fclose (file);
return TRUE;
}
void S9xCheatsDisable (void)
{
unsigned int i;
if (!Cheat.enabled)
return;
for (i = 0; i < Cheat.g.size (); i++)
{
if (Cheat.g[i].enabled)
{
S9xDisableCheatGroup (i);
Cheat.g[i].enabled = TRUE;
}
}
Cheat.enabled = FALSE;
}
void S9xCheatsEnable (void)
{
unsigned int i;
if (Cheat.enabled)
return;
Cheat.enabled = TRUE;
for (i = 0; i < Cheat.g.size (); i++)
{
if (Cheat.g[i].enabled)
{
Cheat.g[i].enabled = FALSE;
S9xEnableCheatGroup (i);
}
}
}
int S9xImportCheatsFromDatabase (const char *filename)
{
char sha256_txt[65];
char hextable[] = "0123456789abcdef";
unsigned int i;
bml_node bml;
if (!bml.parse_file(filename))
return -1; // No file
for (i = 0; i < 32; i++)
{
sha256_txt[i * 2] = hextable[Memory.ROMSHA256[i] >> 4];
sha256_txt[i * 2 + 1] = hextable[Memory.ROMSHA256[i] & 0xf];
}
sha256_txt[64] = '\0';
for (i = 0; i < bml.child.size (); i++)
{
if (!strcasecmp (bml.child[i].name.c_str(), "cartridge"))
{
bml_node *n;
if ((n = bml.child[i].find_subnode ("sha256")))
{
if (!strcasecmp (n->data.c_str(), sha256_txt))
{
S9xLoadCheatsFromBMLNode (&bml.child[i]);
return 0;
}
}
}
}
return -2; /* No codes */
}
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