the next data portion or
  return an eof condition for that file part wrapped in the zip archive.
</p>
</td></tr><tr><td valign="top"><p>
  The <code>zzip_disk_fread</code> function reads more bytes into the output buffer specified as
  arguments. The return value is null on eof or error, the stdio-like
  interface can not distinguish between these so you need to check
  with <code><a href="#zzip_disk_feof">zzip_disk_feof</a></code> for the difference.
</p>
</td></tr><tr><td valign="top"><p>  The <code>zzip