370 lines
11 KiB
C
370 lines
11 KiB
C
#include "gb.h"
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#include <stdio.h>
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#include <errno.h>
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static bool dump_section(FILE *f, const void *src, uint32_t size)
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{
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if (fwrite(&size, 1, sizeof(size), f) != sizeof(size)) {
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return false;
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}
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if (fwrite(src, 1, size, f) != size) {
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return false;
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}
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return true;
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}
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#define DUMP_SECTION(gb, f, section) dump_section(f, GB_GET_SECTION(gb, section), GB_SECTION_SIZE(section))
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/* Todo: we need a sane and protable save state format. */
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int GB_save_state(GB_gameboy_t *gb, const char *path)
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{
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FILE *f = fopen(path, "wb");
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if (!f) {
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GB_log(gb, "Could not open save state: %s.\n", strerror(errno));
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return errno;
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}
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if (fwrite(GB_GET_SECTION(gb, header), 1, GB_SECTION_SIZE(header), f) != GB_SECTION_SIZE(header)) goto error;
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if (!DUMP_SECTION(gb, f, core_state)) goto error;
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if (!DUMP_SECTION(gb, f, dma )) goto error;
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if (!DUMP_SECTION(gb, f, mbc )) goto error;
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if (!DUMP_SECTION(gb, f, hram )) goto error;
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if (!DUMP_SECTION(gb, f, timing )) goto error;
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if (!DUMP_SECTION(gb, f, apu )) goto error;
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if (!DUMP_SECTION(gb, f, rtc )) goto error;
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if (!DUMP_SECTION(gb, f, video )) goto error;
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if (GB_is_hle_sgb(gb)) {
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if (!dump_section(f, gb->sgb, sizeof(*gb->sgb))) goto error;
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}
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if (fwrite(gb->mbc_ram, 1, gb->mbc_ram_size, f) != gb->mbc_ram_size) {
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goto error;
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}
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if (fwrite(gb->ram, 1, gb->ram_size, f) != gb->ram_size) {
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goto error;
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}
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if (fwrite(gb->vram, 1, gb->vram_size, f) != gb->vram_size) {
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goto error;
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}
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errno = 0;
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error:
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fclose(f);
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return errno;
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}
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#undef DUMP_SECTION
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size_t GB_get_save_state_size(GB_gameboy_t *gb)
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{
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return GB_SECTION_SIZE(header)
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+ GB_SECTION_SIZE(core_state) + sizeof(uint32_t)
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+ GB_SECTION_SIZE(dma ) + sizeof(uint32_t)
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+ GB_SECTION_SIZE(mbc ) + sizeof(uint32_t)
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+ GB_SECTION_SIZE(hram ) + sizeof(uint32_t)
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+ GB_SECTION_SIZE(timing ) + sizeof(uint32_t)
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+ GB_SECTION_SIZE(apu ) + sizeof(uint32_t)
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+ GB_SECTION_SIZE(rtc ) + sizeof(uint32_t)
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+ GB_SECTION_SIZE(video ) + sizeof(uint32_t)
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+ (GB_is_hle_sgb(gb)? sizeof(*gb->sgb) + sizeof(uint32_t) : 0)
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+ gb->mbc_ram_size
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+ gb->ram_size
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+ gb->vram_size;
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}
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/* A write-line function for memory copying */
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static void buffer_write(const void *src, size_t size, uint8_t **dest)
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{
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memcpy(*dest, src, size);
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*dest += size;
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}
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static void buffer_dump_section(uint8_t **buffer, const void *src, uint32_t size)
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{
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buffer_write(&size, sizeof(size), buffer);
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buffer_write(src, size, buffer);
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}
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#define DUMP_SECTION(gb, buffer, section) buffer_dump_section(&buffer, GB_GET_SECTION(gb, section), GB_SECTION_SIZE(section))
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void GB_save_state_to_buffer(GB_gameboy_t *gb, uint8_t *buffer)
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{
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buffer_write(GB_GET_SECTION(gb, header), GB_SECTION_SIZE(header), &buffer);
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DUMP_SECTION(gb, buffer, core_state);
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DUMP_SECTION(gb, buffer, dma );
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DUMP_SECTION(gb, buffer, mbc );
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DUMP_SECTION(gb, buffer, hram );
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DUMP_SECTION(gb, buffer, timing );
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DUMP_SECTION(gb, buffer, apu );
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DUMP_SECTION(gb, buffer, rtc );
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DUMP_SECTION(gb, buffer, video );
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if (GB_is_hle_sgb(gb)) {
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buffer_dump_section(&buffer, gb->sgb, sizeof(*gb->sgb));
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}
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buffer_write(gb->mbc_ram, gb->mbc_ram_size, &buffer);
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buffer_write(gb->ram, gb->ram_size, &buffer);
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buffer_write(gb->vram, gb->vram_size, &buffer);
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}
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/* Best-effort read function for maximum future compatibility. */
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static bool read_section(FILE *f, void *dest, uint32_t size)
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{
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uint32_t saved_size = 0;
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if (fread(&saved_size, 1, sizeof(size), f) != sizeof(size)) {
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return false;
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}
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if (saved_size <= size) {
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if (fread(dest, 1, saved_size, f) != saved_size) {
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return false;
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}
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}
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else {
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if (fread(dest, 1, size, f) != size) {
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return false;
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}
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fseek(f, saved_size - size, SEEK_CUR);
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}
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return true;
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}
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#undef DUMP_SECTION
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static bool verify_state_compatibility(GB_gameboy_t *gb, GB_gameboy_t *save)
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{
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if (gb->magic != save->magic) {
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GB_log(gb, "The file is not a save state, or is from an incompatible operating system.\n");
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return false;
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}
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if (gb->version != save->version) {
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GB_log(gb, "The save state is for a different version of SameBoy.\n");
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return false;
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}
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if (gb->mbc_ram_size < save->mbc_ram_size) {
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GB_log(gb, "The save state has non-matching MBC RAM size.\n");
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return false;
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}
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if (gb->vram_size != save->vram_size) {
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GB_log(gb, "The save state has non-matching VRAM size. Try changing the emulated model.\n");
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return false;
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}
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if (GB_is_hle_sgb(gb) != GB_is_hle_sgb(save)) {
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GB_log(gb, "The save state is %sfor a Super Game Boy. Try changing the emulated model.\n", GB_is_hle_sgb(save)? "" : "not ");
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return false;
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}
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if (gb->ram_size != save->ram_size) {
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if (gb->ram_size == 0x1000 * 8 && save->ram_size == 0x2000 * 8) {
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/* A bug in versions prior to 0.12 made CGB instances allocate twice the ammount of RAM.
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Ignore this issue to retain compatibility with older, 0.11, save states. */
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}
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else {
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GB_log(gb, "The save state has non-matching RAM size. Try changing the emulated model.\n");
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return false;
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}
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}
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return true;
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}
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#define READ_SECTION(gb, f, section) read_section(f, GB_GET_SECTION(gb, section), GB_SECTION_SIZE(section))
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int GB_load_state(GB_gameboy_t *gb, const char *path)
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{
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GB_gameboy_t save;
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/* Every unread value should be kept the same. */
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memcpy(&save, gb, sizeof(save));
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/* ...Except ram size, we use it to detect old saves with incorrect ram sizes */
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save.ram_size = 0;
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FILE *f = fopen(path, "rb");
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if (!f) {
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GB_log(gb, "Could not open save state: %s.\n", strerror(errno));
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return errno;
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}
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if (fread(GB_GET_SECTION(&save, header), 1, GB_SECTION_SIZE(header), f) != GB_SECTION_SIZE(header)) goto error;
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if (!READ_SECTION(&save, f, core_state)) goto error;
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if (!READ_SECTION(&save, f, dma )) goto error;
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if (!READ_SECTION(&save, f, mbc )) goto error;
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if (!READ_SECTION(&save, f, hram )) goto error;
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if (!READ_SECTION(&save, f, timing )) goto error;
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if (!READ_SECTION(&save, f, apu )) goto error;
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if (!READ_SECTION(&save, f, rtc )) goto error;
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if (!READ_SECTION(&save, f, video )) goto error;
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if (save.ram_size == 0) {
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/* Save doesn't have ram size specified, it's a pre 0.12 save state with potentially
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incorrect RAM amount if it's a CGB instance */
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if (GB_is_cgb(&save)) {
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save.ram_size = 0x2000 * 8; // Incorrect RAM size
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}
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else {
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save.ram_size = gb->ram_size;
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}
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}
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if (!verify_state_compatibility(gb, &save)) {
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errno = -1;
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goto error;
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}
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if (GB_is_hle_sgb(gb)) {
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if (!read_section(f, gb->sgb, sizeof(*gb->sgb))) goto error;
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}
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memset(gb->mbc_ram + save.mbc_ram_size, 0xFF, gb->mbc_ram_size - save.mbc_ram_size);
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if (fread(gb->mbc_ram, 1, save.mbc_ram_size, f) != save.mbc_ram_size) {
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fclose(f);
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return EIO;
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}
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if (fread(gb->ram, 1, gb->ram_size, f) != gb->ram_size) {
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fclose(f);
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return EIO;
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}
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/* Fix for 0.11 save states that allocate twice the amount of RAM in CGB instances */
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fseek(f, save.ram_size - gb->ram_size, SEEK_CUR);
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if (fread(gb->vram, 1, gb->vram_size, f) != gb->vram_size) {
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fclose(f);
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return EIO;
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}
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size_t orig_ram_size = gb->ram_size;
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memcpy(gb, &save, sizeof(save));
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gb->ram_size = orig_ram_size;
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errno = 0;
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for (unsigned i = 0; i < 32; i++) {
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GB_palette_changed(gb, false, i * 2);
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GB_palette_changed(gb, true, i * 2);
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}
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gb->bg_fifo.read_end &= 0xF;
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gb->bg_fifo.write_end &= 0xF;
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gb->oam_fifo.read_end &= 0xF;
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gb->oam_fifo.write_end &= 0xF;
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error:
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fclose(f);
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return errno;
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}
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#undef READ_SECTION
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/* An read-like function for buffer-copying */
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static size_t buffer_read(void *dest, size_t length, const uint8_t **buffer, size_t *buffer_length)
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{
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if (length > *buffer_length) {
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length = *buffer_length;
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}
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memcpy(dest, *buffer, length);
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*buffer += length;
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*buffer_length -= length;
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return length;
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}
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static bool buffer_read_section(const uint8_t **buffer, size_t *buffer_length, void *dest, uint32_t size)
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{
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uint32_t saved_size = 0;
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if (buffer_read(&saved_size, sizeof(size), buffer, buffer_length) != sizeof(size)) {
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return false;
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}
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if (saved_size > *buffer_length) return false;
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if (saved_size <= size) {
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if (buffer_read(dest, saved_size, buffer, buffer_length) != saved_size) {
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return false;
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}
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}
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else {
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if (buffer_read(dest, size, buffer, buffer_length) != size) {
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return false;
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}
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*buffer += saved_size - size;
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*buffer_length -= saved_size - size;
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}
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return true;
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}
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#define READ_SECTION(gb, buffer, length, section) buffer_read_section(&buffer, &length, GB_GET_SECTION(gb, section), GB_SECTION_SIZE(section))
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int GB_load_state_from_buffer(GB_gameboy_t *gb, const uint8_t *buffer, size_t length)
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{
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GB_gameboy_t save;
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/* Every unread value should be kept the same. */
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memcpy(&save, gb, sizeof(save));
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if (buffer_read(GB_GET_SECTION(&save, header), GB_SECTION_SIZE(header), &buffer, &length) != GB_SECTION_SIZE(header)) return -1;
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if (!READ_SECTION(&save, buffer, length, core_state)) return -1;
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if (!READ_SECTION(&save, buffer, length, dma )) return -1;
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if (!READ_SECTION(&save, buffer, length, mbc )) return -1;
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if (!READ_SECTION(&save, buffer, length, hram )) return -1;
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if (!READ_SECTION(&save, buffer, length, timing )) return -1;
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if (!READ_SECTION(&save, buffer, length, apu )) return -1;
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if (!READ_SECTION(&save, buffer, length, rtc )) return -1;
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if (!READ_SECTION(&save, buffer, length, video )) return -1;
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if (!verify_state_compatibility(gb, &save)) {
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return -1;
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}
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if (GB_is_hle_sgb(gb)) {
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if (!buffer_read_section(&buffer, &length, gb->sgb, sizeof(*gb->sgb))) return -1;
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}
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memset(gb->mbc_ram + save.mbc_ram_size, 0xFF, gb->mbc_ram_size - save.mbc_ram_size);
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if (buffer_read(gb->mbc_ram, save.mbc_ram_size, &buffer, &length) != save.mbc_ram_size) {
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return -1;
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}
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if (buffer_read(gb->ram, gb->ram_size, &buffer, &length) != gb->ram_size) {
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return -1;
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}
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if (buffer_read(gb->vram,gb->vram_size, &buffer, &length) != gb->vram_size) {
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return -1;
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}
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/* Fix for 0.11 save states that allocate twice the amount of RAM in CGB instances */
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buffer += save.ram_size - gb->ram_size;
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length -= save.ram_size - gb->ram_size;
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memcpy(gb, &save, sizeof(save));
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for (unsigned i = 0; i < 32; i++) {
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GB_palette_changed(gb, false, i * 2);
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GB_palette_changed(gb, true, i * 2);
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}
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gb->bg_fifo.read_end &= 0xF;
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gb->bg_fifo.write_end &= 0xF;
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gb->oam_fifo.read_end &= 0xF;
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gb->oam_fifo.write_end &= 0xF;
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return 0;
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}
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#undef READ_SECTION
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