Date: Tue, 17 Jun 2003 15:33:18 -0400
Message-Id: <200306171933.h5HJXIJw010320@envy.delorie.com>
From: DJ Delorie <dj AT delorie DOT com>
To: djgpp AT delorie DOT com
CC: djgpp AT delorie DOT com
In-reply-to: <055b01c33505$aecfabe0$0600000a@broadpark.no> (giva@bgnett.no)
Subject: Re: Custom COFF-header
References:  <055b01c33505$aecfabe0$0600000a AT broadpark DOT no>
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> Is it possible to add custom fields to the COFF or stub.asm header
> without destroying anything (checksums etc.).

Not really.

> Problem: I want to read N*512 blocks of an djgpp .exe-image
> from a tftp-server to a diskless (only RAM-disk) client. In order
> not to transfer the same image when not needed, I want to check
> against some timestamp and version info in COFF header.
> If they match, I terminated the tftp transfer and go on with my 
> business.

Use the FILHDR.f_timdat field.  You'll probably have to set it
yourself, though.  There's also AOUTHDR.vstamp

http://www.delorie.com/djgpp/doc/coff/