struct dictionary_t* load_dictionary_b(const char *filename, int *err_code)
{
    if(!filename)
    {
        if(err_code)
            *err_code=1;
        return NULL;
    }
    FILE *f=fopen(filename, "rb");
    if(!f)
    {
        if(err_code)
            *err_code=2;
        return NULL;
    }
    int size=0;
    if(!fread(&size, sizeof(int), 1, f))
    {
        fclose(f);
        if(err_code)
            *err_code=3;
        return NULL;
    }
    if(size<=0)
    {
        if(err_code)
            *err_code=3;
        fclose(f);
        return NULL;
    }
    int error=0;
    struct dictionary_t *p=create_dictionary(size, &error);
    if(!p)
    {
        fclose(f);
        if(err_code)
            *err_code=4;
        return NULL;
    }
    for(int i=0; i<size; i++)
    {
        int len=0;
        if(!fread(&len, sizeof(int), 1, f))
        {
            fclose(f);
            destroy_dictionary(&p);
            if(err_code)
                *err_code=3;
            return NULL;
        }
        if(len<=0)
        {
            destroy_dictionary(&p);
            fclose(f);
            if(err_code)
                *err_code=3;
            return NULL;
        }
        char* txt=malloc(len+1);
        if(!txt)
        {
            fclose(f);
            destroy_dictionary(&p);
            if(err_code)
                *err_code=4;
            return NULL;
        }
        for(int j=0; j<len; j++)
        {
            if(!fread(txt+j, sizeof(char), 1, f))
            {
                destroy_dictionary(&p);
                fclose(f);
                free(txt);
                if(err_code)
                    *err_code=3;
                return NULL;
            }
        }
        *(txt+len)='\0';
        if(dictionary_find_word(p, txt))
        {
            destroy_dictionary(&p);
            fclose(f);
            free(txt);
            if(err_code)
                *err_code=3;
            return NULL;
        }
        if(dictionary_add_word(p, txt)==2)
        {
            destroy_dictionary(&p);
            fclose(f);
            free(txt);
            if(err_code)
                *err_code=4;
            return NULL;
        }
        free(txt);
        int counter=0;
        if(!fread(&counter, sizeof(int), 1, f))
        {
            fclose(f);
            destroy_dictionary(&p);
            if(err_code)
                *err_code=3;
            return NULL;
        }
        if(counter<=0)
        {
            destroy_dictionary(&p);
            fclose(f);
            free(txt);
            if(err_code)
                *err_code=3;
            return NULL;
        }
        (p->wc+i)->counter=counter;
    }
    fclose(f);
    if(err_code)
        *err_code=0;
    return p;
}