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#include "../copyright"
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include "snes9x.h"
#include "cheats.h"
#include "memmap.h"
extern SCheatData Cheat;
void S9xInitCheatData(void)
{
Cheat.RAM = Memory.RAM;
Cheat.SRAM = Memory.SRAM;
Cheat.FillRAM = Memory.FillRAM;
}
void S9xAddCheat(bool enable, bool save_current_value, uint32_t address, uint8_t 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 = enable;
if (save_current_value)
{
Cheat.c [Cheat.num_cheats].saved_byte = S9xGetByte(address);
Cheat.c [Cheat.num_cheats].saved = true;
}
Cheat.num_cheats++;
if (enable)
S9xApplyCheat(Cheat.num_cheats - 1);
}
}
void S9xDeleteCheat(uint32_t which1)
{
if (which1 < Cheat.num_cheats)
{
if (Cheat.c [which1].enabled)
S9xRemoveCheat(which1);
/* memmove required: Overlapping addresses [Neb] */
memmove(&Cheat.c [which1], &Cheat.c [which1 + 1], sizeof(Cheat.c [0]) * (Cheat.num_cheats - which1 - 1));
Cheat.num_cheats--;
}
}
void S9xDeleteCheats(void)
{
S9xRemoveCheats();
Cheat.num_cheats = 0;
}
void S9xEnableCheat(uint32_t which1)
{
if (which1 < Cheat.num_cheats && !Cheat.c [which1].enabled)
{
Cheat.c [which1].enabled = true;
S9xApplyCheat(which1);
}
}
void S9xDisableCheat(uint32_t which1)
{
if (which1 < Cheat.num_cheats && Cheat.c [which1].enabled)
{
S9xRemoveCheat(which1);
Cheat.c [which1].enabled = false;
}
}
void S9xRemoveCheat(uint32_t which1)
{
if (Cheat.c [which1].saved)
{
uint32_t address = Cheat.c [which1].address;
int32_t block = (address >> MEMMAP_SHIFT) & MEMMAP_MASK;
uint8_t* ptr = Memory.Map [block];
if (ptr >= (uint8_t*) MAP_LAST)
ptr[address & 0xffff] = Cheat.c [which1].saved_byte;
else
S9xSetByte(Cheat.c [which1].saved_byte, address);
/* Unsave the address for the next call to S9xRemoveCheat. */
Cheat.c [which1].saved = false;
}
}
void S9xApplyCheat(uint32_t which1)
{
int32_t block;
uint8_t *ptr;
uint32_t address = Cheat.c [which1].address;
if (!Cheat.c [which1].saved)
Cheat.c [which1].saved_byte = S9xGetByte(address);
block = (address >> MEMMAP_SHIFT) & MEMMAP_MASK;
ptr = Memory.Map [block];
if (ptr >= (uint8_t*) MAP_LAST)
ptr[address & 0xffff] = Cheat.c [which1].byte;
else
S9xSetByte(Cheat.c [which1].byte, address);
Cheat.c [which1].saved = true;
}
void S9xApplyCheats(void)
{
uint32_t i;
if (Settings.ApplyCheats)
for (i = 0; i < Cheat.num_cheats; i++)
if (Cheat.c [i].enabled)
S9xApplyCheat(i);
}
void S9xRemoveCheats(void)
{
uint32_t i;
for (i = 0; i < Cheat.num_cheats; i++)
if (Cheat.c [i].enabled)
S9xRemoveCheat(i);
}
bool S9xLoadCheatFile(const char* filename)
{
uint8_t data [8 + MAX_SFCCHEAT_NAME];
FILE* fs = fopen(filename, "rb");
Cheat.num_cheats = 0;
if (!fs)
return false;
while (fread((void*) data, 1, 8 + MAX_SFCCHEAT_NAME, fs) == 8 + MAX_SFCCHEAT_NAME)
{
if (data[6] != 254 || data[7] != 252)
{
fclose(fs);
return false;
}
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;
memcpy(Cheat.c [Cheat.num_cheats].name, &data [8], MAX_SFCCHEAT_NAME - 1);
Cheat.c [Cheat.num_cheats++].name [MAX_SFCCHEAT_NAME - 1] = 0;
}
fclose(fs);
return true;
}
bool S9xSaveCheatFile(const char* filename)
{
uint32_t i;
uint8_t data [8 + MAX_SFCCHEAT_NAME];
FILE* fs;
if (Cheat.num_cheats == 0)
{
(void) remove(filename);
return true;
}
fs = fopen(filename, "wb");
if (!fs)
return false;
for (i = 0; i < Cheat.num_cheats; i++)
{
memset(data, 0, 8 + MAX_SFCCHEAT_NAME);
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_t) Cheat.c [i].address;
data [3] = (uint8_t)(Cheat.c [i].address >> 8);
data [4] = (uint8_t)(Cheat.c [i].address >> 16);
data [5] = Cheat.c [i].saved_byte;
memcpy(&data [8], Cheat.c [i].name, MAX_SFCCHEAT_NAME - 1);
if (fwrite(data, 8 + MAX_SFCCHEAT_NAME, 1, fs) != 1)
{
fclose(fs);
return false;
}
}
fclose(fs);
return true;
}
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