//
// IDEA : Truncate file to "total_size" after writing the directory.
//
// On Linux / MacOSX, this can be done as follows:
// - fflush(fp) -- ensure STDIO has empty buffers
// - ftruncate(fileno(fp), total_size);
// - freopen(fp)
//
// On Windows:
// - instead of ftruncate, use _chsize() or _chsize_s()
// [ investigate what the difference is.... ]
//
