Starship/src/engine/fox_save.c

#include "global.h"

SaveFile gSaveFile;
Save gDefaultSave = {
    {
        // Replace with SaveData once that struct is complete
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
        0x02, 0x03, 0x04, 0x00, 0x63, 0x63, 0x63, 0x46, 0x4F, 0x58, 0x50, 0x45, 0x50, 0x53, 0x4C, 0x50, 0x46,
        0x41, 0x4C, 0x57, 0x4C, 0x46, 0x4C, 0x4F, 0x4E, 0x50, 0x49, 0x47, 0x41, 0x4E, 0x52, 0x42, 0x49, 0x4C,
        0x4B, 0x41, 0x54, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x64, 0x90, 0x09, 0x57, 0x09, 0xB7, 0x09, 0x87,
        0x09, 0x37, 0x09, 0x17, 0x09, 0xF7, 0x5A, 0x90, 0x09, 0x54, 0x09, 0x64, 0x09, 0xD4, 0x09, 0x74, 0x09,
        0x14, 0x09, 0xF4, 0x50, 0x90, 0x09, 0x02, 0x09, 0xC2, 0x09, 0x42, 0x09, 0xA2, 0x09, 0x22, 0x09, 0xE2,
        0x46, 0x90, 0x09, 0x01, 0x09, 0xC1, 0x09, 0x41, 0x09, 0xA1, 0x09, 0x21, 0x09, 0xE1, 0x3C, 0x90, 0x09,
        0x05, 0x09, 0xC5, 0x09, 0x45, 0x09, 0xA5, 0x09, 0x25, 0x09, 0xE5, 0x32, 0x90, 0x04, 0x03, 0x09, 0xC3,
        0x09, 0x43, 0x09, 0xA3, 0x09, 0x23, 0x09, 0xE3, 0x28, 0x90, 0x01, 0x06, 0x02, 0xC6, 0x09, 0x46, 0x09,
        0xA6, 0x09, 0x26, 0x09, 0xE6, 0x1E, 0x90, 0x01, 0x02, 0x01, 0xC4, 0x01, 0x47, 0x08, 0xA5, 0x09, 0x23,
        0x09, 0xE6, 0x14, 0x90, 0x01, 0x03, 0x01, 0xC5, 0x01, 0x47, 0x01, 0xA4, 0x06, 0x22, 0x09, 0xE1, 0x0A,
        0x90, 0x01, 0x07, 0x01, 0xC4, 0x01, 0x44, 0x01, 0xA2, 0x01, 0x21, 0x04, 0xE5, 0xFF, 0x09, 0x01, 0x02,
        0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
    },
    0,
};

u16 Save_Checksum(Save* arg0) {
    u16 var_v1;
    s32 i;

    for (i = 0, var_v1 = 0; i < sizeof(SaveData); i++) {
        var_v1 ^= arg0->raw[i];
        var_v1 <<= 1;
        var_v1 = (var_v1 & 0xFE) | ((var_v1 >> 8) & 1);
    }

    var_v1 = (var_v1 & 0xFF) | 0x9500;

    return var_v1;
}

s32 Save_Write(void) {
    OSMesg sp1C;

    gSaveFile.save.checksum = Save_Checksum(&gSaveFile.save);
    gSaveFile.backup = gSaveFile.save;
    gSaveIOBuffer = gSaveFile;
    return Save_WriteData();
}

s32 Save_Read(void) {
    OSMesg* sp24;
    s32 i;

    //if(!Save_ReadData()) {
    //    return 0;
    //}

    Save_ReadData();

    gSaveFile = gSaveIOBuffer;

    if (gSaveFile.save.checksum == Save_Checksum(&gSaveFile.save)) {
        PRINTF("ＥＥＰＲＯＭ ＲＯＭ［０］ 正常\n");
        return 0;
    }
#ifdef AVOID_UB
    for (i = 0; i < sizeof(SaveData); i++) {
#else
    for (i = 0; i <= sizeof(SaveData); i++) { // should be <, but gets overwritten immediately.
#endif
        gSaveFile.save.raw[i] = gSaveFile.backup.raw[i];
    }
    gSaveFile.save.checksum = gSaveFile.backup.checksum;

    if (gSaveFile.save.checksum == Save_Checksum(&gSaveFile.save)) {
        PRINTF("ＥＥＰＲＯＭ ＲＯＭ［1］ 正常\n");
        return 0;
    } else {
        PRINTF("ＥＥＰＲＯＭ ＲＯＭ［０］ ＆ ＲＯＭ［1］ 異常\n");
        return -1;
    }
}