bool setFileLength(FILE* file, unsigned int len)
    {
    #ifdef _WIN32
        fseek(file, len, SEEK_SET);
        int fd = _fileno(file);
        HANDLE hfile = (HANDLE)_get_osfhandle(fd);
        return !!SetEndOfFile(hfile);
    #else
        int fd = fileno(file);
        return ftruncate(fd, len) == 0;
    #endif
    }