mirror of https://github.com/bsnes-emu/bsnes.git
Redo save states to remove severe code duplication between buffers and files
This commit is contained in:
Lior Halphon
parent
ad54dc57b0
commit
da1003263f
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@ -2,64 +2,78 @@
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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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typedef struct virtual_file_s virtual_file_t;
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struct virtual_file_s
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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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size_t (*read)(virtual_file_t *file, void *dest, size_t length);
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size_t (*write)(virtual_file_t *file, const void *dest, size_t length);
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void (*seek)(virtual_file_t *file, ssize_t ammount, int origin);
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union {
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FILE *file;
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struct {
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uint8_t *buffer;
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size_t position;
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size_t size;
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};
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};
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};
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static size_t file_read(virtual_file_t *file, void *dest, size_t length)
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{
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return fread(dest, 1, length, file->file);
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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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static void file_seek(virtual_file_t *file, ssize_t ammount, int origin)
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{
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fseek(file->file, ammount, origin);
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}
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static size_t file_write(virtual_file_t *file, const void *src, size_t length)
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{
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return fwrite(src, 1, length, file->file);
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}
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static size_t buffer_read(virtual_file_t *file, void *dest, size_t length)
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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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if (length > file->size - file->position) {
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errno = EIO;
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length = file->size - file->position;
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}
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error:
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fclose(f);
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return errno;
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memcpy(dest, file->buffer + file->position, length);
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file->position += length;
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return length;
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}
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#undef DUMP_SECTION
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static void buffer_seek(virtual_file_t *file, ssize_t ammount, int origin)
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{
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switch (origin) {
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case SEEK_SET:
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file->position = ammount;
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break;
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case SEEK_CUR:
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file->position += ammount;
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break;
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case SEEK_END:
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file->position = file->size + ammount;
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break;
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default:
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break;
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}
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if (file->position > file->size) {
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file->position = file->size;
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}
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}
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static size_t buffer_write(virtual_file_t *file, const void *src, size_t size)
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{
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memcpy(file->buffer + file->position, src, size);
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file->position += size;
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return size;
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}
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size_t GB_get_save_state_size(GB_gameboy_t *gb)
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{
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@ -78,74 +92,6 @@ size_t GB_get_save_state_size(GB_gameboy_t *gb)
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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, bool fix_broken_windows_saves)
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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 (fix_broken_windows_saves) {
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if (saved_size < 4) {
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return false;
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}
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saved_size -= 4;
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fseek(f, 4, SEEK_CUR);
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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_and_update_state_compatibility(GB_gameboy_t *gb, GB_gameboy_t *save)
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{
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if (save->ram_size == 0 && (&save->ram_size)[-1] == gb->ram_size) {
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@ -229,9 +175,116 @@ static void sanitize_state(GB_gameboy_t *gb)
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}
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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), fix_broken_windows_saves)
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static bool dump_section(virtual_file_t *file, const void *src, uint32_t size)
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{
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if (file->write(file, &size, sizeof(size)) != sizeof(size)) {
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return false;
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}
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if (file->write(file, src, size) != 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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int GB_load_state(GB_gameboy_t *gb, const char *path)
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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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static int save_state_internal(GB_gameboy_t *gb, virtual_file_t *file)
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{
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if (file->write(file, GB_GET_SECTION(gb, header), GB_SECTION_SIZE(header)) != GB_SECTION_SIZE(header)) goto error;
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if (!DUMP_SECTION(gb, file, core_state)) goto error;
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if (!DUMP_SECTION(gb, file, dma )) goto error;
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if (!DUMP_SECTION(gb, file, mbc )) goto error;
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if (!DUMP_SECTION(gb, file, hram )) goto error;
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if (!DUMP_SECTION(gb, file, timing )) goto error;
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if (!DUMP_SECTION(gb, file, apu )) goto error;
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if (!DUMP_SECTION(gb, file, rtc )) goto error;
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if (!DUMP_SECTION(gb, file, video )) goto error;
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if (GB_is_hle_sgb(gb)) {
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if (!dump_section(file, gb->sgb, sizeof(*gb->sgb))) goto error;
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}
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if (file->write(file, gb->mbc_ram, gb->mbc_ram_size) != gb->mbc_ram_size) {
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goto error;
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}
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if (file->write(file, gb->ram, gb->ram_size) != gb->ram_size) {
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goto error;
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}
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if (file->write(file, gb->vram, gb->vram_size) != 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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return errno;
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}
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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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virtual_file_t file = {
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.write = file_write,
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.seek = file_seek,
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.file = f,
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};
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int ret = save_state_internal(gb, &file);
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fclose(f);
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return ret;
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}
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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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virtual_file_t file = {
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.write = buffer_write,
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.seek = buffer_seek,
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.buffer = (uint8_t *)buffer,
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.position = 0,
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};
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save_state_internal(gb, &file);
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}
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static bool read_section(virtual_file_t *file, void *dest, uint32_t size, bool fix_broken_windows_saves)
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{
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uint32_t saved_size = 0;
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if (file->read(file, &saved_size, sizeof(size)) != sizeof(size)) {
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return false;
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}
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if (fix_broken_windows_saves) {
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if (saved_size < 4) {
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return false;
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}
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saved_size -= 4;
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file->seek(file, 4, SEEK_CUR);
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}
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if (saved_size <= size) {
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if (file->read(file, dest, saved_size) != 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 (file->read(file, dest, size) != size) {
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return false;
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}
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file->seek(file, saved_size - size, SEEK_CUR);
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}
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return true;
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}
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static int load_state_internal(GB_gameboy_t *gb, virtual_file_t *file)
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{
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GB_gameboy_t save;
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@ -240,184 +293,93 @@ int GB_load_state(GB_gameboy_t *gb, const char *path)
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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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bool fix_broken_windows_saves = false;
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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 (file->read(file, GB_GET_SECTION(&save, header), GB_SECTION_SIZE(header)) != GB_SECTION_SIZE(header)) return errno;
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if (save.magic == 0) {
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/* Potentially legacy, broken Windows save state */
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fseek(f, 4, SEEK_SET);
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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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/* Potentially legacy, broken Windows save state*/
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file->seek(file, 4, SEEK_SET);
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if (file->read(file, GB_GET_SECTION(&save, header), GB_SECTION_SIZE(header)) != GB_SECTION_SIZE(header)) return errno;
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fix_broken_windows_saves = true;
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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 (!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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#define READ_SECTION(gb, file, section) read_section(file, GB_GET_SECTION(gb, section), GB_SECTION_SIZE(section), fix_broken_windows_saves)
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if (!READ_SECTION(&save, file, core_state)) return errno;
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if (!READ_SECTION(&save, file, dma )) return errno;
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if (!READ_SECTION(&save, file, mbc )) return errno;
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if (!READ_SECTION(&save, file, hram )) return errno;
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if (!READ_SECTION(&save, file, timing )) return errno;
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if (!READ_SECTION(&save, file, apu )) return errno;
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if (!READ_SECTION(&save, file, rtc )) return errno;
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if (!READ_SECTION(&save, file, video )) return errno;
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#undef READ_SECTION
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if (!verify_and_update_state_compatibility(gb, &save)) {
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errno = -1;
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goto error;
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return errno;
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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), false)) goto error;
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if (!read_section(file, gb->sgb, sizeof(*gb->sgb), false)) return errno;
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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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if (file->read(file, gb->mbc_ram, save.mbc_ram_size) != save.mbc_ram_size) {
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return errno;
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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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if (file->read(file, gb->ram, gb->ram_size) != gb->ram_size) {
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return errno;
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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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file->seek(file, 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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if (file->read(file, gb->vram, gb->vram_size) != gb->vram_size) {
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return errno;
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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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sanitize_state(gb);
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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, bool fix_broken_windows_saves)
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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 (fix_broken_windows_saves) {
|
||||
if (saved_size < 4) {
|
||||
return false;
|
||||
}
|
||||
saved_size -= 4;
|
||||
*buffer += 4;
|
||||
}
|
||||
|
||||
if (saved_size <= size) {
|
||||
if (buffer_read(dest, saved_size, buffer, buffer_length) != saved_size) {
|
||||
return false;
|
||||
}
|
||||
}
|
||||
else {
|
||||
if (buffer_read(dest, size, buffer, buffer_length) != size) {
|
||||
return false;
|
||||
}
|
||||
*buffer += saved_size - size;
|
||||
*buffer_length -= saved_size - size;
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
#define READ_SECTION(gb, buffer, length, section) buffer_read_section(&buffer, &length, GB_GET_SECTION(gb, section), GB_SECTION_SIZE(section), fix_broken_windows_saves)
|
||||
int GB_load_state_from_buffer(GB_gameboy_t *gb, const uint8_t *buffer, size_t length)
|
||||
{
|
||||
GB_gameboy_t save;
|
||||
|
||||
/* Every unread value should be kept the same. */
|
||||
memcpy(&save, gb, sizeof(save));
|
||||
bool fix_broken_windows_saves = false;
|
||||
|
||||
if (buffer_read(GB_GET_SECTION(&save, header), GB_SECTION_SIZE(header), &buffer, &length) != GB_SECTION_SIZE(header)) return -1;
|
||||
if (save.magic == 0) {
|
||||
/* Potentially legacy, broken Windows save state*/
|
||||
buffer -= GB_SECTION_SIZE(header) - 4;
|
||||
length += GB_SECTION_SIZE(header) - 4;
|
||||
if (buffer_read(GB_GET_SECTION(&save, header), GB_SECTION_SIZE(header), &buffer, &length) != GB_SECTION_SIZE(header)) return -1;
|
||||
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;
|
||||
}
|
||||
if (!READ_SECTION(&save, buffer, length, core_state)) return -1;
|
||||
if (!READ_SECTION(&save, buffer, length, dma )) return -1;
|
||||
if (!READ_SECTION(&save, buffer, length, mbc )) return -1;
|
||||
if (!READ_SECTION(&save, buffer, length, hram )) return -1;
|
||||
if (!READ_SECTION(&save, buffer, length, timing )) return -1;
|
||||
if (!READ_SECTION(&save, buffer, length, apu )) return -1;
|
||||
if (!READ_SECTION(&save, buffer, length, rtc )) return -1;
|
||||
if (!READ_SECTION(&save, buffer, length, video )) return -1;
|
||||
|
||||
|
||||
if (!verify_and_update_state_compatibility(gb, &save)) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (GB_is_hle_sgb(gb)) {
|
||||
if (!buffer_read_section(&buffer, &length, gb->sgb, sizeof(*gb->sgb), false)) return -1;
|
||||
}
|
||||
|
||||
memset(gb->mbc_ram + save.mbc_ram_size, 0xFF, gb->mbc_ram_size - save.mbc_ram_size);
|
||||
if (buffer_read(gb->mbc_ram, save.mbc_ram_size, &buffer, &length) != save.mbc_ram_size) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (buffer_read(gb->ram, gb->ram_size, &buffer, &length) != gb->ram_size) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (buffer_read(gb->vram, gb->vram_size, &buffer, &length) != gb->vram_size) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Fix for 0.11 save states that allocate twice the amount of RAM in CGB instances */
|
||||
buffer += save.ram_size - gb->ram_size;
|
||||
length -= save.ram_size - gb->ram_size;
|
||||
|
||||
memcpy(gb, &save, sizeof(save));
|
||||
|
||||
sanitize_state(gb);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#undef READ_SECTION
|
||||
int GB_load_state(GB_gameboy_t *gb, const char *path)
|
||||
{
|
||||
FILE *f = fopen(path, "rb");
|
||||
if (!f) {
|
||||
GB_log(gb, "Could not open save state: %s.\n", strerror(errno));
|
||||
return errno;
|
||||
}
|
||||
virtual_file_t file = {
|
||||
.read = file_read,
|
||||
.seek = file_seek,
|
||||
.file = f,
|
||||
};
|
||||
int ret = load_state_internal(gb, &file);
|
||||
fclose(f);
|
||||
return ret;
|
||||
}
|
||||
|
||||
int GB_load_state_from_buffer(GB_gameboy_t *gb, const uint8_t *buffer, size_t length)
|
||||
{
|
||||
virtual_file_t file = {
|
||||
.read = buffer_read,
|
||||
.seek = buffer_seek,
|
||||
.buffer = (uint8_t *)buffer,
|
||||
.position = 0,
|
||||
.size = length,
|
||||
};
|
||||
|
||||
return load_state_internal(gb, &file);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue