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From: maarten@cs.ruu.nl (Maarten Pennings)
Newsgroups: comp.lang.pascal
Subject: Re: Store password in exe file
Message-ID: <1991Apr15.090229.25024@cs.ruu.nl>
Date: 15 Apr 91 09:02:29 GMT
References: <26530@adm.brl.mil> <3233@snoopy.informatik.uni-kiel.dbp.de>
Organization: Utrecht University, Dept. of Computer Science
Lines: 32

I just read some news about how to include chunks of (changing) information
(like a password) in an EXE file instead of having an additional data file.

I posed just this question some month ago (I wanted to save a 'HiScore'), but
no ready to use answer came forth. So I spend two weekends hacking, and now
have a procedure

  Procedure UpDateExe(var save; size:word)

that lets you update any typed constant in your EXE-file. So, if you have a
declaration like
  
  Const Password: Word = 1234;

you may now have a fragment like

  Read(Password);  {May I change a constant? Yes, as long as it is a typed-one}
  UpDateExe(Password,SizeOf(Password))

and from then on your EXE contains the new value for your password. The
procedure first computes the location of the passed varaiable ('save'), then
determines the size of the exe header and then writes the (first 'size' bytes
of the constant) to the appropriate location in your EXE file.

If somebody out there is interested, I will post or mail the unit. Please send
requests by mail.

Maarten
-- 
Maarten Pennings                       maarten@cs.ruu.nl
In avoiding temptation, one remains pure but irrelevant.
--