What file compression method i.e. gzip, winzip, lha or arj for
instance compress files and leave 5333 as the first two bytes in the
compressed file header? |
Request for Question Clarification by
endo-ga
on
04 Dec 2003 14:16 PST
Hi,
Are you seeking to identify the compression method of a given file?
If so, it would be easier to have access to this file.
Could you please upload it to the following FTP and give us the filename.
ftp://ftp.membres.lycos.fr
username: dbky
password: googleanswers
If the contents of the file are sensitive and you do not feel like
sharing them, please ignore this request.
Thanks.
endo
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Clarification of Question by
ditto21-ga
on
04 Dec 2003 16:01 PST
I cannot login to the FTP if I could I would gladly upload a file that
is compressed using a compression algo that I want an unpacker for.
I will try the Ftp once more
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Request for Question Clarification by
endo-ga
on
04 Dec 2003 16:12 PST
Hi,
What FTP client are you using?
Please note that the actual address of the FTP server is:
ftp.membres.lycos.fr
Thanks.
endo
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Clarification of Question by
ditto21-ga
on
04 Dec 2003 16:17 PST
ok I got in and placed 2 files in the root of that ftp, one called
Delay LCR S.dev and the other called sts4000.dev
if you find an answer it may be that you have to unpack one to check
it, if you manage that then you will know what is written in the
decompressed file header, if you can tell me that (and I know what the
first words are) then you have found an unpacker for it!
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Request for Question Clarification by
endo-ga
on
04 Dec 2003 17:04 PST
Hi,
I've had a bit of a look and haven't found anything.
I know it's not a Motorola S3 file, or anything that Winrar can read.
It's not LaTeX, it's not an image.
Any more information you can provide about the file would be useful.
Thanks.
endo
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Request for Question Clarification by
endo-ga
on
04 Dec 2003 17:07 PST
My best guess so far is they're Linux device drivers.
If you could tell us where you got the files from and why you expect
them to be compressed files that could be useful.
Thanks.
endo
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Clarification of Question by
ditto21-ga
on
05 Dec 2003 01:39 PST
I know what system the files are used with, they are used by a windows
bespoke application. The compressed file within the archive used to be
of gzip format but the company has recently changed this and now I
cannot uncompress the files. I could give you more info about the
company and what the files are, if you can assure me that this is in
strict confidence before I do so.
Ian
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Request for Question Clarification by
endo-ga
on
05 Dec 2003 04:00 PST
Hi,
Thank you for your clarification.
Whatever they are using is not a standard compression technique as far
as I can tell. The file starts with S3 and I haven't been able to find
anything about that (zip starts with PK and rar with RAR).
Sorry but there can be nothing confidential here as per Google Answers
TOS. If you decide to share the name of the application, it will be
accessible by everyone.
Thanks.
endo
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Clarification of Question by
ditto21-ga
on
05 Dec 2003 07:32 PST
Ok Then it might be best I dont share that information, I can tell you
that the files are modules for a application I have purchased and to
better protect them from prying eyes they changes them from gzip to
whatever format/packer they are packed with now.
Obviously I know all the common unpackers wont touch them like winzip
or rar etc, but I cannot imagine they wrote their own
compression/decompression ALGO to pack these files up. My guess is
they could have used something from maybe another platform (i.e Gzip
is not originally windows compression method) so they could be using
something that another OS uses ? or could they still be Gzip but
modified in such a way that the header bytes are different? like maybe
they changed an offset or something, since the app still unpacks the
early gzip files too.
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Clarification of Question by
ditto21-ga
on
06 Dec 2003 03:06 PST
Yes but we are talking about a company who used gzip to compress and
uncompress the files. typically the files are 200-400k and uncompress
to sometimes 15mb. I cant imagine the compression being lossy since
these files are plugins for an app and not pictures etc where a little
loss goes unoticed.
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