fools2019/pk3/calc.c

#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <glib.h>

int s03_A0F3 = 0x5D0B1C11;
int s03_A0F7 = 0x35E79125;
int s03_A0FB = 0x56596b10;
int s03_A0FF = 0x7FFFFB0A;
int s03_A103 = 0x1B080733;

int s03_A107;
int s03_A10B;
int s03_A10D;
int s03_A10E;

char buffer[0x200];

int main()
{
    FILE *f = fopen("fools.sav", "r");
    if (!f) {
        perror("fopen");
        exit(1);
    }
    fseek(f, 0x6567, SEEK_SET);
    fread(buffer, 1, 0x200, f);
    fclose(f);

    GHashTable *hashtable = g_hash_table_new(g_direct_hash, g_direct_equal);

    double start = clock();
    do {
        gint lcg = s03_A0F3 & 0xFFFFFE00;
        gint cur_lcg = GPOINTER_TO_INT(g_hash_table_lookup(hashtable, GINT_TO_POINTER(lcg)));
        cur_lcg += 1;
        g_hash_table_replace(hashtable, GINT_TO_POINTER(lcg), GINT_TO_POINTER(cur_lcg));

        s03_A0F3 = (s03_A0F3 * s03_A0F7 + s03_A0FB) & 0xFFFFFFFF;

        if (s03_A0FF % 0x100000 == 0) {
            double framespers = 0x100000 / ((double)(clock() - start) / CLOCKS_PER_SEC);
            unsigned eta = (double)(s03_A0FF) / framespers;
            fprintf(stderr, "Progress: %d (speed: %.2f iter/s, ETA: %02u:%02u:%02u)\n",
                    s03_A0FF, framespers,
                    eta / 60 / 60, (eta / 60) % 60, eta % 60);
            start = clock();
        }
    } while (--s03_A0FF);

    int count = 0;

    GHashTableIter iter;
    gpointer key, value;
    g_hash_table_iter_init(&iter, hashtable);
    while (g_hash_table_iter_next(&iter, &key, &value)) {
        count += GPOINTER_TO_INT(value) % 2;
    }

    int i = 0;
    start = clock();
    g_hash_table_iter_init(&iter, hashtable);
    while (g_hash_table_iter_next(&iter, &key, &value)) {
        if (GPOINTER_TO_INT(value) % 2 == 0) {
            continue;
        }

        double framespers = 1 / ((double)(clock() - start) / CLOCKS_PER_SEC);
        unsigned eta = (double)(count - i) / framespers;
        fprintf(stderr, "Progress: %d/%d %.2f%% (speed: %.2f iter/s, ETA: %02u:%02u:%02u)\n",
                i, count, (double)i / count * 100, framespers,
                eta / 60 / 60, (eta / 60) % 60, eta % 60);
        start = clock();
        i += 1;

        s03_A107 = s03_A103;

        s03_A10B = (GPOINTER_TO_INT(key) & 0xFF00) >> 8;
        s03_A10D = (GPOINTER_TO_INT(key) & 0xFF0000) >> 16;
        s03_A10E = (GPOINTER_TO_INT(key) & 0xFF000000) >> 24;

        int bufi = 0;
        do {
            s03_A10B = ((s03_A10B / 2) * s03_A10D + s03_A10E) & 0xFFFF;
            buffer[bufi] ^= s03_A10B & 0xFF;

            if (++bufi >= 0x200) bufi = 0;
        } while (--s03_A107);
    }

    g_hash_table_destroy(hashtable);

    f = fopen("output.buf", "w");
    fwrite(buffer, 1, 0x200, f);
    fclose(f);

    return 0;
}