Aha! Alright, that explains it, then. Thank you!
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-------- Original Message --------
On Jul 10, 2018, 10:33 AM, TK Chia wrote:
> Hello Mercury 13,
>
> Yes, the FreeDOS kernel is compressed with UPX --- but there are some
> preprocessing and postprocessing steps done to the uncompressed kernel
> code, before and after it is passed through UPX.
>
> Bart Oldeman's utils/exeflat.c program in the kernel sources is
> responsible for doing these processing steps and wrapping the call to UPX.
>
> I think it _might_ be feasible to write a program to reverse what
> utils/exeflat.c does, to allow UPX to decompress the image, though of
> course this will need some work. Part of the reversal process will
> involve restoring the .exe header and relocation(s) which were created
> by UPX and removed by exeflat.
>
> (Anyway, I think compressing programs is useful, if FreeDOS is likely to
> be used in resource-constrained situations. Floppy disks were not only
> slow --- they also had quite limited capacity. (-: )
>
> Thank you!
>
> --
> https://github.com/tkchia/
>
> On 07/10/2018 03:18 PM, Mercury Thirteen via Freedos-devel wrote:
>> I agree... not sure why the FreeDOS kernel folks felt that was necessary.
>> Maybe a size limitation of the bootloader?
>>
>> Sent from ProtonMail mobile
>>
>> -------- Original Message --------
>> On Jul 10, 2018, 12:47 AM, Ralf Quint wrote:
>>
>>> On 7/9/2018 7:43 PM, Mercury Thirteen via Freedos-devel wrote:
>>>> So, I've been looking into de-UPXing the kernel image and keep getting
>>>> told by the UPX binary that the image "wasn't compressed by UPX". Is
>>>> there anything special I have to do to convince it otherwise? Was the
>>>> kernel in fact not compressed by UPX? I'm using the latest UPX on
>>>> Linux Mint 19, if that helps.
>>> What would be the purpose of using UPX today? It made kind of sense back
>>> in the days of slow data media (floppy disks) but nowadays, there just
>>> isn't IMHO any valid reason to do that anymore.
>>>
>>> Ralf
>>>
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