mirror of https://github.com/mgba-emu/mgba.git
81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
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#include "gba-savedata.h"
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#include "gba.h"
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#include <fcntl.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <unistd.h>
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void GBASavedataInit(struct GBASavedata* savedata, const char* filename) {
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savedata->type = SAVEDATA_NONE;
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savedata->data = 0;
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savedata->fd = -1;
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savedata->filename = filename;
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}
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void GBASavedataDeinit(struct GBASavedata* savedata) {
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switch (savedata->type) {
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case SAVEDATA_SRAM:
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munmap(savedata->data, SIZE_CART_SRAM);
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break;
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case SAVEDATA_FLASH512:
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munmap(savedata->data, SIZE_CART_FLASH512);
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break;
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case SAVEDATA_FLASH1M:
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munmap(savedata->data, SIZE_CART_FLASH1M);
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break;
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case SAVEDATA_EEPROM:
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munmap(savedata->data, SIZE_CART_EEPROM);
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break;
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default:
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break;
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}
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close(savedata->fd);
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savedata->type = SAVEDATA_NONE;
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}
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void GBASavedataInitFlash(struct GBASavedata* savedata) {
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savedata->type = SAVEDATA_FLASH512;
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savedata->fd = open(savedata->filename, O_RDWR | O_CREAT, 0666);
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if (savedata->fd < 0) {
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GBALog(GBA_LOG_WARN, "Cannot open savedata file %s", savedata->filename);
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return;
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}
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// mmap enough so that we can expand the file if we need to
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savedata->data = mmap(0, SIZE_CART_FLASH1M, PROT_READ | PROT_WRITE, 0, savedata->fd, 0);
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off_t end = lseek(savedata->fd, 0, SEEK_END);
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if (end < SIZE_CART_FLASH512) {
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ftruncate(savedata->fd, SIZE_CART_SRAM);
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memset(&savedata->data[end], 0xFF, SIZE_CART_SRAM - end);
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}
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}
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void GBASavedataInitSRAM(struct GBASavedata* savedata) {
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savedata->type = SAVEDATA_SRAM;
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savedata->fd = open(savedata->filename, O_RDWR | O_CREAT, 0666);
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off_t end;
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int flags = MAP_SHARED;
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if (savedata->fd < 0) {
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GBALog(GBA_LOG_WARN, "Cannot open savedata file %s", savedata->filename);
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end = 0;
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flags |= MAP_ANON;
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} else {
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end = lseek(savedata->fd, 0, SEEK_END);
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if (end < SIZE_CART_SRAM) {
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ftruncate(savedata->fd, SIZE_CART_SRAM);
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}
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}
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savedata->data = mmap(0, SIZE_CART_SRAM, PROT_READ | PROT_WRITE, flags, savedata->fd, 0);
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if (end < SIZE_CART_SRAM) {
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memset(&savedata->data[end], 0xFF, SIZE_CART_SRAM - end);
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}
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}
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void GBASavedataWriteFlash(struct GBASavedata* savedata, uint8_t value) {
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(void)(savedata);
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(void)(value);
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GBALog(GBA_LOG_STUB, "Flash memory unimplemented");
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}
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