Initial BESS support, no SGB nor RTC yet

This commit is contained in:
Lior Halphon 2021-03-23 23:33:16 +02:00
parent 925bd863c0
commit 75bc1e9a86
2 changed files with 546 additions and 9 deletions

View File

@ -1181,11 +1181,11 @@ static unsigned *multiplication_table_for_frequency(unsigned frequency)
}];
if (!success) {
NSBeep();
}
if (error) {
[GBWarningPopover popoverWithContents:error onWindow:self.mainWindow];
}
NSBeep();
}
}
- (IBAction)clearConsole:(id)sender

View File

@ -1,6 +1,88 @@
#include "gb.h"
#include <stdio.h>
#include <errno.h>
#include <assert.h>
#define str(x) #x
#define xstr(x) str(x)
#ifdef GB_BIG_ENDIAN
#define BESS_NAME "SameBoy v" xstr(VERSION) "(Big Endian)"
#else
#define BESS_NAME "SameBoy v" xstr(VERSION)
#endif
typedef struct __attribute__((packed)) {
uint32_t magic;
uint32_t size;
} BESS_block_t;
typedef struct __attribute__((packed)) {
uint32_t size;
uint32_t offset;
} BESS_buffer_t;
typedef struct __attribute__((packed)) {
uint32_t start_offset;
uint32_t magic;
} BESS_footer_t;
typedef struct __attribute__((packed)) {
BESS_block_t header;
uint16_t major;
uint16_t minor;
union {
struct {
char family;
char model;
char revision;
char padding;
};
uint32_t full_model;
};
uint16_t pc;
uint16_t af;
uint16_t bc;
uint16_t de;
uint16_t hl;
uint16_t sp;
uint8_t ime;
uint8_t ie;
uint8_t execution_mode; // 0 = running; 1 = halted; 2 = stopped
uint8_t io_registers[0x80];
uint8_t hram[0x7f];
BESS_buffer_t ram;
BESS_buffer_t vram;
BESS_buffer_t mbc_ram;
} BESS_CORE_t;
typedef struct __attribute__((packed)) {
BESS_block_t header;
uint8_t oam[256];
} BESS_OAM_t;
typedef struct __attribute__((packed)) {
BESS_block_t header;
uint8_t background_palettes[0x40];
uint8_t sprite_palettes[0x40];
} BESS_PALS_t;
typedef struct __attribute__((packed)) {
uint16_t address;
uint8_t value;
} BESS_MBC_pair_t;
#ifdef GB_BIG_ENDIAN
#define BESS16(x) __builtin_bswap16(x)
#define BESS32(x) __builtin_bswap32(x)
#else
#define BESS16(x) (x)
#define BESS32(x) (x)
#endif
typedef struct virtual_file_s virtual_file_t;
struct virtual_file_s
@ -8,6 +90,7 @@ struct virtual_file_s
size_t (*read)(virtual_file_t *file, void *dest, size_t length);
size_t (*write)(virtual_file_t *file, const void *dest, size_t length);
void (*seek)(virtual_file_t *file, ssize_t ammount, int origin);
size_t (*tell)(virtual_file_t *file);
union {
FILE *file;
struct {
@ -33,8 +116,16 @@ static size_t file_write(virtual_file_t *file, const void *src, size_t length)
return fwrite(src, 1, length, file->file);
}
static size_t file_tell(virtual_file_t *file)
{
return ftell(file->file);
}
static size_t buffer_read(virtual_file_t *file, void *dest, size_t length)
{
if (length & 0x80000000) {
return 0;
}
errno = 0;
if (length > file->size - file->position) {
errno = EIO;
@ -75,6 +166,31 @@ static size_t buffer_write(virtual_file_t *file, const void *src, size_t size)
return size;
}
static size_t buffer_tell(virtual_file_t *file)
{
return file->position;
}
static size_t bess_size_for_cartridge(const GB_cartridge_t *cart)
{
switch (cart->mbc_type) {
default:
case GB_NO_MBC: return 0;
case GB_MBC1:
return sizeof(BESS_block_t) + 4 * sizeof(BESS_MBC_pair_t);
case GB_MBC2:
return sizeof(BESS_block_t) + 2 * sizeof(BESS_MBC_pair_t);
case GB_MBC3:
return sizeof(BESS_block_t) + 4 * sizeof(BESS_MBC_pair_t);
case GB_MBC5:
return sizeof(BESS_block_t) + 4 * sizeof(BESS_MBC_pair_t);
case GB_HUC1:
return sizeof(BESS_block_t) + 4 * sizeof(BESS_MBC_pair_t);
case GB_HUC3:
return sizeof(BESS_block_t) + 3 * sizeof(BESS_MBC_pair_t);
}
}
size_t GB_get_save_state_size(GB_gameboy_t *gb)
{
return GB_SECTION_SIZE(header)
@ -89,11 +205,21 @@ size_t GB_get_save_state_size(GB_gameboy_t *gb)
+ (GB_is_hle_sgb(gb)? sizeof(*gb->sgb) + sizeof(uint32_t) : 0)
+ gb->mbc_ram_size
+ gb->ram_size
+ gb->vram_size;
+ gb->vram_size
// BESS
+ sizeof(BESS_CORE_t)
+ sizeof(BESS_block_t) // NAME
+ sizeof(BESS_NAME) - 1
+ sizeof(BESS_OAM_t)
+ (GB_is_cgb(gb)? sizeof(BESS_PALS_t) : 0)
+ bess_size_for_cartridge(gb->cartridge_type) // MBC block
+ sizeof(BESS_block_t) // END block
+ sizeof(BESS_footer_t);
}
static bool verify_and_update_state_compatibility(GB_gameboy_t *gb, GB_gameboy_t *save)
static bool verify_and_update_state_compatibility(GB_gameboy_t *gb, GB_gameboy_t *save, bool *attempt_bess)
{
*attempt_bess = false;
if (save->ram_size == 0 && (&save->ram_size)[-1] == gb->ram_size) {
/* This is a save state with a bad printer struct from a 32-bit OS */
memmove(save->extra_oam + 4, save->extra_oam, (uintptr_t)&save->ram_size - (uintptr_t)&save->extra_oam);
@ -121,6 +247,7 @@ static bool verify_and_update_state_compatibility(GB_gameboy_t *gb, GB_gameboy_t
if (gb->version != save->version) {
GB_log(gb, "The save state is for a different version of SameBoy.\n");
*attempt_bess = true;
return false;
}
@ -190,6 +317,66 @@ static bool dump_section(virtual_file_t *file, const void *src, uint32_t size)
#define DUMP_SECTION(gb, f, section) dump_section(f, GB_GET_SECTION(gb, section), GB_SECTION_SIZE(section))
static int save_bess_mbc_block(GB_gameboy_t *gb, virtual_file_t *file)
{
BESS_block_t mbc_block = {htonl('MBC '), 0};
BESS_MBC_pair_t pairs[4];
switch (gb->cartridge_type->mbc_type) {
default:
case GB_NO_MBC: return 0;
case GB_MBC1:
pairs[0] = (BESS_MBC_pair_t){BESS16(0x0000), gb->mbc_ram_enable? 0xA : 0x0};
pairs[1] = (BESS_MBC_pair_t){BESS16(0x2000), gb->mbc1.bank_low};
pairs[2] = (BESS_MBC_pair_t){BESS16(0x4000), gb->mbc1.bank_high};
pairs[3] = (BESS_MBC_pair_t){BESS16(0x6000), gb->mbc1.mode};
mbc_block.size = 4 * sizeof(pairs[0]);
break;
case GB_MBC2:
pairs[0] = (BESS_MBC_pair_t){BESS16(0x0000), gb->mbc_ram_enable? 0xA : 0x0};
pairs[1] = (BESS_MBC_pair_t){BESS16(0x0100), gb->mbc2.rom_bank};
mbc_block.size = 2 * sizeof(pairs[0]);
break;
case GB_MBC3:
pairs[0] = (BESS_MBC_pair_t){BESS16(0x0000), gb->mbc_ram_enable? 0xA : 0x0};
pairs[1] = (BESS_MBC_pair_t){BESS16(0x2000), gb->mbc3.rom_bank};
pairs[2] = (BESS_MBC_pair_t){BESS16(0x4000), gb->mbc3.ram_bank | (gb->mbc3_rtc_mapped? 8 : 0)};
pairs[3] = (BESS_MBC_pair_t){BESS16(0x6000), gb->rtc_latch};
mbc_block.size = 4 * sizeof(pairs[0]);
break;
case GB_MBC5:
pairs[0] = (BESS_MBC_pair_t){BESS16(0x0000), gb->mbc_ram_enable? 0xA : 0x0};
pairs[1] = (BESS_MBC_pair_t){BESS16(0x2000), gb->mbc5.rom_bank_low};
pairs[2] = (BESS_MBC_pair_t){BESS16(0x3000), gb->mbc5.rom_bank_high};
pairs[3] = (BESS_MBC_pair_t){BESS16(0x4000), gb->mbc5.ram_bank};
mbc_block.size = 4 * sizeof(pairs[0]);
break;
case GB_HUC1:
pairs[0] = (BESS_MBC_pair_t){BESS16(0x0000), gb->huc1.ir_mode? 0xE : 0x0};
pairs[1] = (BESS_MBC_pair_t){BESS16(0x2000), gb->huc1.bank_low};
pairs[2] = (BESS_MBC_pair_t){BESS16(0x4000), gb->huc1.bank_high};
pairs[3] = (BESS_MBC_pair_t){BESS16(0x6000), gb->huc1.mode};
mbc_block.size = 4 * sizeof(pairs[0]);
case GB_HUC3:
pairs[0] = (BESS_MBC_pair_t){BESS16(0x0000), gb->huc3_mode};
pairs[1] = (BESS_MBC_pair_t){BESS16(0x2000), gb->huc3.rom_bank};
pairs[2] = (BESS_MBC_pair_t){BESS16(0x4000), gb->huc3.ram_bank};
mbc_block.size = 3 * sizeof(pairs[0]);
break;
}
if (file->write(file, &mbc_block, sizeof(mbc_block)) != sizeof(mbc_block)) {
return errno;
}
if (file->write(file, &pairs, mbc_block.size) != mbc_block.size) {
return errno;
}
return 0;
}
static int save_state_internal(GB_gameboy_t *gb, virtual_file_t *file)
{
if (file->write(file, GB_GET_SECTION(gb, header), GB_SECTION_SIZE(header)) != GB_SECTION_SIZE(header)) goto error;
@ -206,20 +393,139 @@ static int save_state_internal(GB_gameboy_t *gb, virtual_file_t *file)
if (!dump_section(file, gb->sgb, sizeof(*gb->sgb))) goto error;
}
BESS_CORE_t bess_core;
bess_core.mbc_ram.offset = file->tell(file);
bess_core.mbc_ram.size = gb->mbc_ram_size;
if (file->write(file, gb->mbc_ram, gb->mbc_ram_size) != gb->mbc_ram_size) {
goto error;
}
bess_core.ram.offset = file->tell(file);
bess_core.ram.size = gb->ram_size;
if (file->write(file, gb->ram, gb->ram_size) != gb->ram_size) {
goto error;
}
bess_core.vram.offset = file->tell(file);
bess_core.vram.size = gb->vram_size;
if (file->write(file, gb->vram, gb->vram_size) != gb->vram_size) {
goto error;
}
errno = 0;
BESS_footer_t bess_footer = {
.start_offset = file->tell(file),
.magic = htonl('BESS'),
};
/* BESS CORE */
bess_core.header = (BESS_block_t){htonl('CORE'), BESS32(sizeof(bess_core) - sizeof(bess_core.header))};
bess_core.major = BESS16(1);
bess_core.minor = BESS16(1);
switch (gb->model) {
case GB_MODEL_DMG_B: bess_core.full_model = htonl('GDB '); break;
case GB_MODEL_SGB_NTSC:
case GB_MODEL_SGB_NTSC_NO_SFC:
bess_core.full_model = htonl('SN '); break;
case GB_MODEL_SGB_PAL_NO_SFC:
case GB_MODEL_SGB_PAL:
bess_core.full_model = htonl('SP '); break;
case GB_MODEL_SGB2_NO_SFC:
case GB_MODEL_SGB2:
bess_core.full_model = htonl('S2 '); break;
case GB_MODEL_CGB_C: bess_core.full_model = htonl('CCC '); break;
case GB_MODEL_CGB_E: bess_core.full_model = htonl('CCE '); break;
case GB_MODEL_AGB: bess_core.full_model = htonl('CA '); break; // SameBoy doesn't emulate a specific AGB revision yet
}
bess_core.pc = BESS16(gb->pc);
bess_core.af = BESS16(gb->af);
bess_core.bc = BESS16(gb->bc);
bess_core.de = BESS16(gb->de);
bess_core.hl = BESS16(gb->hl);
bess_core.sp = BESS16(gb->sp);
bess_core.ime = gb->ime;
bess_core.ie = gb->interrupt_enable;
bess_core.execution_mode = 0;
if (gb->halted) {
bess_core.execution_mode = 1;
}
else if (gb->stopped) {
bess_core.execution_mode = 2;
}
memcpy(bess_core.io_registers, gb->io_registers, sizeof(gb->io_registers));
bess_core.io_registers[GB_IO_DIV] = gb->div_counter >> 8;
bess_core.io_registers[GB_IO_BANK] = gb->boot_rom_finished;
bess_core.io_registers[GB_IO_KEY1] |= gb->cgb_double_speed? 0x80 : 0;
memcpy(bess_core.hram, gb->hram, sizeof(gb->hram));
if (file->write(file, &bess_core, sizeof(bess_core)) != sizeof(bess_core)) {
goto error;
}
/* BESS NAME */
static const BESS_block_t bess_name = {htonl('NAME'), BESS32(sizeof(BESS_NAME) - 1)};
if (file->write(file, &bess_name, sizeof(bess_name)) != sizeof(bess_name)) {
goto error;
}
if (file->write(file, BESS_NAME, sizeof(BESS_NAME) - 1) != sizeof(BESS_NAME) - 1) {
goto error;
}
/* BESS OAM */
BESS_OAM_t bess_oam;
bess_oam.header = (BESS_block_t){htonl('OAM '), BESS32(sizeof(bess_oam) - sizeof(bess_oam.header))};
memcpy(bess_oam.oam, gb->oam, sizeof(gb->oam));
memcpy(bess_oam.oam + sizeof(gb->oam), gb->extra_oam, sizeof(gb->extra_oam));
if (file->write(file, &bess_oam, sizeof(bess_oam)) != sizeof(bess_oam)) {
goto error;
}
save_bess_mbc_block(gb, file);
if (GB_is_cgb(gb)) {
/* BESS PALS */
BESS_PALS_t bess_pals;
bess_pals.header = (BESS_block_t){htonl('PALS'), BESS32(sizeof(bess_pals) - sizeof(bess_oam.header))};
memcpy(bess_pals.background_palettes, gb->background_palettes_data, sizeof(bess_pals.background_palettes));
memcpy(bess_pals.sprite_palettes, gb->sprite_palettes_data, sizeof(bess_pals.sprite_palettes));
if (file->write(file, &bess_pals, sizeof(bess_pals)) != sizeof(bess_pals)) {
goto error;
}
}
/* BESS END */
static const BESS_block_t bess_end = {htonl('END '), 0};
if (file->write(file, &bess_end, sizeof(bess_end)) != sizeof(bess_end)) {
goto error;
}
/* BESS Footer */
if (file->write(file, &bess_footer, sizeof(bess_footer)) != sizeof(bess_footer)) {
goto error;
}
errno = 0;
error:
return errno;
}
@ -234,6 +540,7 @@ int GB_save_state(GB_gameboy_t *gb, const char *path)
virtual_file_t file = {
.write = file_write,
.seek = file_seek,
.tell = file_tell,
.file = f,
};
int ret = save_state_internal(gb, &file);
@ -246,11 +553,13 @@ void GB_save_state_to_buffer(GB_gameboy_t *gb, uint8_t *buffer)
virtual_file_t file = {
.write = buffer_write,
.seek = buffer_seek,
.tell = buffer_tell,
.buffer = (uint8_t *)buffer,
.position = 0,
};
save_state_internal(gb, &file);
assert(file.position == GB_get_save_state_size(gb));
}
@ -284,6 +593,229 @@ static bool read_section(virtual_file_t *file, void *dest, uint32_t size, bool f
return true;
}
static void read_bess_buffer(const BESS_buffer_t *buffer, virtual_file_t *file, uint8_t *dest, size_t max_size)
{
size_t pos = file->tell(file);
file->seek(file, BESS32(buffer->offset), SEEK_SET);
file->read(file, dest, MIN(BESS32(buffer->size), max_size));
file->seek(file, pos, SEEK_SET);
}
static int load_bess_save(GB_gameboy_t *gb, virtual_file_t *file, bool is_sameboy)
{
char emulator_name[65] = {0,};
file->seek(file, -sizeof(BESS_footer_t), SEEK_END);
BESS_footer_t footer = {0, };
file->read(file, &footer, sizeof(footer));
if (footer.magic != htonl('BESS')) {
// Not a BESS file
if (!is_sameboy) {
GB_log(gb, "The file is not a save state, or is from an incompatible operating system.\n");
}
return -1;
}
GB_gameboy_t save;
GB_init(&save, gb->model);
save.cartridge_type = gb->cartridge_type;
file->seek(file, BESS32(footer.start_offset), SEEK_SET);
bool found_core = false;
BESS_CORE_t core;
while (true) {
BESS_block_t block;
if (file->read(file, &block, sizeof(block)) != sizeof(block)) goto error;
switch (block.magic) {
case htonl('CORE'):
if (found_core) goto parse_error;
found_core = true;
if (BESS32(block.size) > sizeof(core) - sizeof(block)) {
if (file->read(file, &core.header + 1, sizeof(core) - sizeof(block)) != sizeof(core) - sizeof(block)) goto error;
file->seek(file, BESS32(block.size) - (sizeof(core) - sizeof(block)), SEEK_CUR);
}
else {
if (file->read(file, &core.header + 1, BESS32(block.size)) != BESS32(block.size)) goto error;
}
if (core.major != BESS16(1)) {
GB_log(gb, "This save state uses an incompatible version of the BESS specification");
GB_free(&save);
return -1;
}
switch (core.family) {
case 'C':
if (!GB_is_cgb(&save)) goto wrong_model;
break;
case 'S':
if (!GB_is_sgb(&save)) goto wrong_model;
break;
case 'G':
if (GB_is_cgb(&save) || GB_is_sgb(&save)) goto wrong_model;
break;
default:
wrong_model:
GB_log(gb, "The save state is for a different model. Try changing the emulated model.\n");
GB_free(&save);
return -1;
}
save.pc = BESS16(core.pc);
save.af = BESS16(core.af);
save.bc = BESS16(core.bc);
save.de = BESS16(core.de);
save.hl = BESS16(core.hl);
save.sp = BESS16(core.sp);
save.ime = core.ime;
save.interrupt_enable = core.ie;
save.halted = core.execution_mode == 1;
save.stopped = core.execution_mode == 2;
memcpy(save.hram, core.hram, sizeof(save.hram));
// CPU related
// Determines DMG mode
GB_write_memory(&save, 0xFF00 + GB_IO_KEY0, core.io_registers[GB_IO_KEY0]);
save.boot_rom_finished = core.io_registers[GB_IO_BANK];
GB_write_memory(&save, 0xFF00 + GB_IO_KEY1, core.io_registers[GB_IO_KEY1]);
if (save.cgb_mode) {
save.cgb_double_speed = core.io_registers[GB_IO_KEY1] & 0x80;
save.object_priority = GB_OBJECT_PRIORITY_INDEX;
}
else {
save.object_priority = GB_OBJECT_PRIORITY_X;
}
// Timers, Joypad and Serial
GB_write_memory(&save, 0xFF00 + GB_IO_JOYP, core.io_registers[GB_IO_JOYP]);
GB_write_memory(&save, 0xFF00 + GB_IO_SB, core.io_registers[GB_IO_SB]);
save.io_registers[GB_IO_SC] = core.io_registers[GB_IO_SC];
save.div_counter = core.io_registers[GB_IO_DIV] << 8;
GB_write_memory(&save, 0xFF00 + GB_IO_TIMA, core.io_registers[GB_IO_TIMA]);
GB_write_memory(&save, 0xFF00 + GB_IO_TMA, core.io_registers[GB_IO_TMA]);
GB_write_memory(&save, 0xFF00 + GB_IO_TAC, core.io_registers[GB_IO_TAC]);
// APU
GB_write_memory(&save, 0xFF00 + GB_IO_NR52, core.io_registers[GB_IO_NR52]);
for (unsigned i = GB_IO_NR10; i < GB_IO_NR52; i++) {
uint8_t value = core.io_registers[i];
if (i == GB_IO_NR14 || i == GB_IO_NR24 || i == GB_IO_NR34 || i == GB_IO_NR44) {
value &= ~0x80;
}
GB_write_memory(&save, 0xFF00 + i, value);
}
for (unsigned i = GB_IO_WAV_START; i <= GB_IO_WAV_END; i++) {
GB_write_memory(&save, 0xFF00 + i, core.io_registers[i]);
}
// PPU
GB_write_memory(&save, 0xFF00 + GB_IO_LCDC, core.io_registers[GB_IO_LCDC]);
GB_write_memory(&save, 0xFF00 + GB_IO_STAT, core.io_registers[GB_IO_STAT]);
GB_write_memory(&save, 0xFF00 + GB_IO_SCY, core.io_registers[GB_IO_SCY]);
GB_write_memory(&save, 0xFF00 + GB_IO_SCX, core.io_registers[GB_IO_SCX]);
GB_write_memory(&save, 0xFF00 + GB_IO_LYC, core.io_registers[GB_IO_LYC]);
save.io_registers[GB_IO_DMA] = core.io_registers[GB_IO_DMA];
GB_write_memory(&save, 0xFF00 + GB_IO_BGP, core.io_registers[GB_IO_BGP]);
GB_write_memory(&save, 0xFF00 + GB_IO_OBP0, core.io_registers[GB_IO_OBP0]);
GB_write_memory(&save, 0xFF00 + GB_IO_OBP1, core.io_registers[GB_IO_OBP1]);
GB_write_memory(&save, 0xFF00 + GB_IO_WX, core.io_registers[GB_IO_WX]);
GB_write_memory(&save, 0xFF00 + GB_IO_WY, core.io_registers[GB_IO_WY]);
// Other registers
GB_write_memory(&save, 0xFF00 + GB_IO_VBK, core.io_registers[GB_IO_VBK]);
GB_write_memory(&save, 0xFF00 + GB_IO_HDMA1, core.io_registers[GB_IO_HDMA1]);
GB_write_memory(&save, 0xFF00 + GB_IO_HDMA2, core.io_registers[GB_IO_HDMA2]);
GB_write_memory(&save, 0xFF00 + GB_IO_HDMA3, core.io_registers[GB_IO_HDMA3]);
GB_write_memory(&save, 0xFF00 + GB_IO_HDMA4, core.io_registers[GB_IO_HDMA4]);
GB_write_memory(&save, 0xFF00 + GB_IO_RP, core.io_registers[GB_IO_RP]);
GB_write_memory(&save, 0xFF00 + GB_IO_BGPI, core.io_registers[GB_IO_BGPI]);
GB_write_memory(&save, 0xFF00 + GB_IO_OBPI, core.io_registers[GB_IO_OBPI]);
GB_write_memory(&save, 0xFF00 + GB_IO_OPRI, core.io_registers[GB_IO_OPRI]);
GB_write_memory(&save, 0xFF00 + GB_IO_SVBK, core.io_registers[GB_IO_SVBK]);
// Interrupts
GB_write_memory(&save, 0xFF00 + GB_IO_IF, core.io_registers[GB_IO_IF]);
break;
case htonl('NAME'):
if (!found_core) goto parse_error;
if (BESS32(block.size) > sizeof(emulator_name) - 1) {
file->seek(file, BESS32(block.size), SEEK_CUR);
}
else {
file->read(file, emulator_name, BESS32(block.size));
}
break;
case htonl('OAM '):
if (!found_core) goto parse_error;
if (BESS32(block.size) != 256 && BESS32(block.size) != 160) goto parse_error;
file->read(file, save.oam, sizeof(save.oam));
if (BESS32(block.size) == 256) {
file->read(file, save.extra_oam, sizeof(save.extra_oam));
}
break;
case htonl('PALS'):
if (!found_core) goto parse_error;
if (BESS32(block.size) != sizeof(BESS_PALS_t) - sizeof(block)) goto parse_error;
file->read(file, save.background_palettes_data, sizeof(save.background_palettes_data));
file->read(file, save.sprite_palettes_data, sizeof(save.sprite_palettes_data));
break;
case htonl('MBC '):
if (!found_core) goto parse_error;
if (BESS32(block.size) % 3 != 0) goto parse_error;
for (unsigned i = BESS32(block.size); i > 0; i -= 3) {
BESS_MBC_pair_t pair;
file->read(file, &pair, sizeof(pair));
if (BESS16(pair.address) >= 0x8000) goto parse_error;
GB_write_memory(&save, BESS16(pair.address), pair.value);
}
break;
case htonl('END '):
if (!found_core) goto parse_error;
if (BESS32(block.size) != 0) goto parse_error;
goto done;
default:
file->seek(file, BESS32(block.size), SEEK_CUR);
break;
}
}
done:
save.mbc_ram_size = gb->mbc_ram_size;
memcpy(gb, &save, GB_SECTION_OFFSET(unsaved));
assert(GB_get_save_state_size(gb) == GB_get_save_state_size(&save));
GB_free(&save);
read_bess_buffer(&core.ram, file, gb->ram, gb->ram_size);
read_bess_buffer(&core.vram, file, gb->vram, gb->vram_size);
read_bess_buffer(&core.mbc_ram, file, gb->mbc_ram, gb->mbc_ram_size);
if (emulator_name[0]) {
GB_log(gb, "Save state imported from %s.\n", emulator_name);
}
else {
GB_log(gb, "Save state imported from another emulator.\n"); // SameBoy always contains a NAME block
}
for (unsigned i = 0; i < 32; i++) {
GB_palette_changed(gb, false, i * 2);
GB_palette_changed(gb, true, i * 2);
}
return 0;
parse_error:
errno = -1;
error:
if (emulator_name[0]) {
GB_log(gb, "Attempted to import a save state from %s, but the save state is invalid.\n", emulator_name);
}
else {
GB_log(gb, "Attempted to import a save state from a different emulator or incompatible version, but the save state is invalid.\n");
}
GB_free(&save);
return errno;
}
static int load_state_internal(GB_gameboy_t *gb, virtual_file_t *file)
{
GB_gameboy_t save;
@ -304,8 +836,7 @@ static int load_state_internal(GB_gameboy_t *gb, virtual_file_t *file)
fix_broken_windows_saves = true;
}
if (gb->magic != save.magic) {
GB_log(gb, "The file is not a save state, or is from an incompatible operating system.\n");
return false;
return load_bess_save(gb, file, false);
}
#define READ_SECTION(gb, file, section) read_section(file, GB_GET_SECTION(gb, section), GB_SECTION_SIZE(section), fix_broken_windows_saves)
if (!READ_SECTION(&save, file, core_state)) return errno ?: EIO;
@ -319,7 +850,11 @@ static int load_state_internal(GB_gameboy_t *gb, virtual_file_t *file)
#undef READ_SECTION
if (!verify_and_update_state_compatibility(gb, &save)) {
bool attempt_bess = false;
if (!verify_and_update_state_compatibility(gb, &save, &attempt_bess)) {
if (attempt_bess) {
return load_bess_save(gb, file, true);
}
return errno;
}
@ -362,6 +897,7 @@ int GB_load_state(GB_gameboy_t *gb, const char *path)
virtual_file_t file = {
.read = file_read,
.seek = file_seek,
.tell = file_tell,
.file = f,
};
int ret = load_state_internal(gb, &file);
@ -374,6 +910,7 @@ int GB_load_state_from_buffer(GB_gameboy_t *gb, const uint8_t *buffer, size_t le
virtual_file_t file = {
.read = buffer_read,
.seek = buffer_seek,
.tell = buffer_tell,
.buffer = (uint8_t *)buffer,
.position = 0,
.size = length,