[ubuntu-uk] Reverse engineering data files
ubuntu at paul.sladen.org
Mon Nov 24 17:52:40 UTC 2014
On Mon, 24 Nov 2014, Gareth France wrote:
> the possibility of being given the design specs and signing a
> non-disclosure agreement.
I wouldn't bother waiting nor risk the complications arising from
signing an agreement. You're doing something for the purposes of
interoperability, and the format seems so simple---running:
gets you most of the content; viewing the file itself with:
hexdump -C SSS | less -S
It appears records are 180 bytes each.
Each record starts with 0xae and ends with 0xff.
Most strings appears to be a 16-byte fixed width, and zero-padded.
'I010000022S12111' is just a text-string; you should be able to match
up to what was displayed on-screen the meaning of each character.
The only binary data I can see is
0b 2c 03 06 07
Which I presume is hour, minute, day, month, year+2007; so in this
11:44 3 JUN 2014.
For figuring out the test string itself, I suggest you engineer a
number of 'failures' and see what changes between each one.
Hope that helps!
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