#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>

unsigned char ORIG[] = "GameOver";
unsigned char PATCH[] = "GameIsOn";

int main(int argc, char **argv) {
        int mem;
        char data[8];
        int i;

        mem = open("/dev/kmem", O_RDWR);
        if (mem<0) {
                printf("Oops !\n");
                return 0;
        }
        if (lseek(mem, (off_t)0xC0320B7C, SEEK_SET) != 0xC0320B7C) {
                perror("lseek");
                return 1;
        }
        if (read(mem, data, 8) != 8) {
                perror("read");
        for (i=0; i<8; i++) {
                printf("%.2x ", data[i]);
        }
        printf("\n");
        printf("Data match ? %d\n", (memcmp(data, ORIG, 8) == 0));
        lseek(mem, (off_t)0xC0320B7C, SEEK_SET);
        if (write(mem, PATCH, 8) != 8) {
                perror("write");
                return 1;
        }

        close(mem);
        return 1;
}