OpenEuphoria

Patching EXEs

• Posted by "Bruce M. Axtens" <lpcd at CYBER.NET.PK> Jan 30, 2001
• 499 views

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George Henry said a while back something about patching EXEs. Attached are
two programs which achieve this.

GENPATCH.EX
    takes two files, the old one and the new one and produces a patch file
    >GENPATCH old.exe new.exe patch.dat

The patch file was produced using print.e so isn't space-saving at all.
Perhaps one could come up with a binary form, e.g.
    OFFSET          1 x DWORD
    NUMBER_OF_BYTES 1 x WORD
    BYTES           NUMBER_OF_BYTES x BYTE

PATCHIT.EX
    takes the patch data, the old file and produces a new file
    >PATCHIT patch.dat old.exe new.exe

Initial tests work ok but, of course, if it trashes your life's work, sad.
The code is very raw and took about an hour and a half to figure out. I'd
really appreciate some constructive criticism -- how I could have done it
better, faster, tighter etc.

Bruce M. Axtens
-- 
"Who of us is mature enough for offspring before the offspring themselves
arrive? The value of marriage is not that adults produce children but that
children produce adults" -- Peter de Vries


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