314 lines
9.3 KiB
C
314 lines
9.3 KiB
C
#include "gb.h"
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#include "cheats.h"
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#include <stdio.h>
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#include <assert.h>
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#include <errno.h>
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static inline uint8_t hash_addr(uint16_t addr)
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{
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return addr;
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}
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static uint16_t bank_for_addr(GB_gameboy_t *gb, uint16_t addr)
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{
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if (addr < 0x4000) {
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return gb->mbc_rom0_bank;
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}
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if (addr < 0x8000) {
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return gb->mbc_rom_bank;
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}
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if (addr < 0xD000) {
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return 0;
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}
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if (addr < 0xE000) {
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return gb->cgb_ram_bank;
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}
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return 0;
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}
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void GB_apply_cheat(GB_gameboy_t *gb, uint16_t address, uint8_t *value)
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{
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if (!gb->cheat_enabled) return;
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if (!gb->boot_rom_finished) return;
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const GB_cheat_hash_t *hash = gb->cheat_hash[hash_addr(address)];
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if (hash) {
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for (unsigned i = 0; i < hash->size; i++) {
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GB_cheat_t *cheat = hash->cheats[i];
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if (cheat->address == address && cheat->enabled && (!cheat->use_old_value || cheat->old_value == *value)) {
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if (cheat->bank == GB_CHEAT_ANY_BANK || cheat->bank == bank_for_addr(gb, address)) {
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*value = cheat->value;
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break;
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}
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}
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}
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}
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}
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bool GB_cheats_enabled(GB_gameboy_t *gb)
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{
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return gb->cheat_enabled;
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}
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void GB_set_cheats_enabled(GB_gameboy_t *gb, bool enabled)
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{
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gb->cheat_enabled = enabled;
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}
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void GB_add_cheat(GB_gameboy_t *gb, const char *description, uint16_t address, uint16_t bank, uint8_t value, uint8_t old_value, bool use_old_value, bool enabled)
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{
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GB_cheat_t *cheat = malloc(sizeof(*cheat));
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cheat->address = address;
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cheat->bank = bank;
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cheat->value = value;
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cheat->old_value = old_value;
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cheat->use_old_value = use_old_value;
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cheat->enabled = enabled;
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strncpy(cheat->description, description, sizeof(cheat->description));
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cheat->description[sizeof(cheat->description) - 1] = 0;
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gb->cheats = realloc(gb->cheats, (++gb->cheat_count) * sizeof(gb->cheats[0]));
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gb->cheats[gb->cheat_count - 1] = cheat;
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GB_cheat_hash_t **hash = &gb->cheat_hash[hash_addr(address)];
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if (!*hash) {
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*hash = malloc(sizeof(GB_cheat_hash_t) + sizeof(cheat));
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(*hash)->size = 1;
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(*hash)->cheats[0] = cheat;
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}
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else {
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(*hash)->size++;
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*hash = realloc(*hash, sizeof(GB_cheat_hash_t) + sizeof(cheat) * (*hash)->size);
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(*hash)->cheats[(*hash)->size - 1] = cheat;
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}
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}
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const GB_cheat_t *const *GB_get_cheats(GB_gameboy_t *gb, size_t *size)
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{
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*size = gb->cheat_count;
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return (void *)gb->cheats;
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}
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void GB_remove_cheat(GB_gameboy_t *gb, const GB_cheat_t *cheat)
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{
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for (unsigned i = 0; i < gb->cheat_count; i++) {
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if (gb->cheats[i] == cheat) {
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gb->cheats[i] = gb->cheats[--gb->cheat_count];
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if (gb->cheat_count == 0) {
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free(gb->cheats);
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gb->cheats = NULL;
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}
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else {
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gb->cheats = realloc(gb->cheats, gb->cheat_count * sizeof(gb->cheats[0]));
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}
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break;
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}
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}
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GB_cheat_hash_t **hash = &gb->cheat_hash[hash_addr(cheat->address)];
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for (unsigned i = 0; i < (*hash)->size; i++) {
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if ((*hash)->cheats[i] == cheat) {
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(*hash)->cheats[i] = (*hash)->cheats[(*hash)->size--];
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if ((*hash)->size == 0) {
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free(*hash);
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*hash = NULL;
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}
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else {
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*hash = malloc(sizeof(GB_cheat_hash_t) + sizeof(cheat) * (*hash)->size);
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}
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break;
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}
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}
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free((void *)cheat);
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}
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bool GB_import_cheat(GB_gameboy_t *gb, const char *cheat, const char *description, bool enabled)
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{
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uint8_t dummy;
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/* GameShark */
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{
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uint8_t bank;
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uint8_t value;
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uint16_t address;
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if (sscanf(cheat, "%02hhx%02hhx%04hx%c", &bank, &value, &address, &dummy) == 3) {
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if (bank >= 0x80) {
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bank &= 0xF;
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}
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GB_add_cheat(gb, description, address, bank, value, 0, false, enabled);
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return true;
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}
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}
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/* GameGenie */
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{
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char stripped_cheat[10] = {0,};
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for (unsigned i = 0; i < 9 && *cheat; i++) {
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stripped_cheat[i] = *(cheat++);
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while (*cheat == '-') {
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cheat++;
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}
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}
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// Delete the 7th character;
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stripped_cheat[7] = stripped_cheat[8];
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stripped_cheat[8] = 0;
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uint8_t old_value;
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uint8_t value;
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uint16_t address;
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if (sscanf(stripped_cheat, "%02hhx%04hx%02hhx%c", &value, &address, &old_value, &dummy) == 3) {
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address = (uint16_t)(address >> 4) | (uint16_t)(address << 12);
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address ^= 0xF000;
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if (address > 0x7FFF) {
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return false;
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}
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old_value = (uint8_t)(old_value >> 2) | (uint8_t)(old_value << 6);
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old_value ^= 0xBA;
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GB_add_cheat(gb, description, address, GB_CHEAT_ANY_BANK, value, old_value, true, enabled);
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return true;
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}
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if (sscanf(stripped_cheat, "%02hhx%04hx%c", &value, &address, &dummy) == 2) {
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address = (uint16_t)(address >> 4) | (uint16_t)(address << 12);
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address ^= 0xF000;
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if (address > 0x7FFF) {
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return false;
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}
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GB_add_cheat(gb, description, address, GB_CHEAT_ANY_BANK, value, false, true, enabled);
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return true;
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}
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}
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return false;
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}
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void GB_update_cheat(GB_gameboy_t *gb, const GB_cheat_t *_cheat, const char *description, uint16_t address, uint16_t bank, uint8_t value, uint8_t old_value, bool use_old_value, bool enabled)
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{
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GB_cheat_t *cheat = NULL;
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for (unsigned i = 0; i < gb->cheat_count; i++) {
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if (gb->cheats[i] == _cheat) {
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cheat = gb->cheats[i];
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break;
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}
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}
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assert(cheat);
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if (cheat->address != address) {
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/* Remove from old bucket */
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GB_cheat_hash_t **hash = &gb->cheat_hash[hash_addr(cheat->address)];
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for (unsigned i = 0; i < (*hash)->size; i++) {
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if ((*hash)->cheats[i] == cheat) {
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(*hash)->cheats[i] = (*hash)->cheats[(*hash)->size--];
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if ((*hash)->size == 0) {
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free(*hash);
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*hash = NULL;
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}
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else {
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*hash = malloc(sizeof(GB_cheat_hash_t) + sizeof(cheat) * (*hash)->size);
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}
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break;
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}
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}
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cheat->address = address;
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/* Add to new bucket */
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hash = &gb->cheat_hash[hash_addr(address)];
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if (!*hash) {
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*hash = malloc(sizeof(GB_cheat_hash_t) + sizeof(cheat));
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(*hash)->size = 1;
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(*hash)->cheats[0] = cheat;
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}
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else {
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(*hash)->size++;
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*hash = realloc(*hash, sizeof(GB_cheat_hash_t) + sizeof(cheat) * (*hash)->size);
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(*hash)->cheats[(*hash)->size - 1] = cheat;
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}
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}
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cheat->bank = bank;
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cheat->value = value;
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cheat->old_value = old_value;
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cheat->use_old_value = use_old_value;
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cheat->enabled = enabled;
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if (description != cheat->description) {
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strncpy(cheat->description, description, sizeof(cheat->description));
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cheat->description[sizeof(cheat->description) - 1] = 0;
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}
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}
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#define CHEAT_MAGIC 'SBCh'
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void GB_load_cheats(GB_gameboy_t *gb, const char *path)
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{
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FILE *f = fopen(path, "rb");
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if (!f) {
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return;
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}
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uint32_t magic = 0;
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uint32_t struct_size = 0;
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fread(&magic, sizeof(magic), 1, f);
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fread(&struct_size, sizeof(struct_size), 1, f);
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if (magic != CHEAT_MAGIC && magic != __builtin_bswap32(CHEAT_MAGIC)) {
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GB_log(gb, "The file is not a SameBoy cheat database");
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return;
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}
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if (struct_size != sizeof(GB_cheat_t)) {
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GB_log(gb, "This cheat database is not compatible with this version of SameBoy");
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return;
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}
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// Remove all cheats first
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while (gb->cheats) {
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GB_remove_cheat(gb, gb->cheats[0]);
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}
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GB_cheat_t cheat;
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while (fread(&cheat, sizeof(cheat), 1, f)) {
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if (magic == __builtin_bswap32(CHEAT_MAGIC)) {
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cheat.address = __builtin_bswap16(cheat.address);
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cheat.bank = __builtin_bswap16(cheat.bank);
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}
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cheat.description[sizeof(cheat.description) - 1] = 0;
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GB_add_cheat(gb, cheat.description, cheat.address, cheat.bank, cheat.value, cheat.old_value, cheat.use_old_value, cheat.enabled);
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}
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return;
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}
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int GB_save_cheats(GB_gameboy_t *gb, const char *path)
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{
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if (!gb->cheat_count) return 0; // Nothing to save.
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FILE *f = fopen(path, "wb");
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if (!f) {
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GB_log(gb, "Could not dump cheat database: %s.\n", strerror(errno));
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return errno;
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}
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uint32_t magic = CHEAT_MAGIC;
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uint32_t struct_size = sizeof(GB_cheat_t);
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if (fwrite(&magic, sizeof(magic), 1, f) != 1) {
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fclose(f);
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return EIO;
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}
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if (fwrite(&struct_size, sizeof(struct_size), 1, f) != 1) {
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fclose(f);
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return EIO;
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}
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for (size_t i = 0; i <gb->cheat_count; i++) {
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if (fwrite(gb->cheats[i], sizeof(*gb->cheats[i]), 1, f) != 1) {
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fclose(f);
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return EIO;
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}
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}
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errno = 0;
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fclose(f);
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return errno;
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}
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