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Re: .sav format [message #52497 is a reply to message #52298]

Tue, 06 February 2007 15:44

JD Smith
Messages: 850
Registered: December 1999

Senior Member

On Tue, 06 Feb 2007 15:00:47 -0500, Haje Korth wrote:

> "Guillermo" <gcastill@ucalgary.ca> wrote in message
> news:1170788649.657637.173590@l53g2000cwa.googlegroups.com.. .
>> On Feb 6, 8:42 am, David Fanning <d...@dfanning.com> wrote:
>>> I think the more obvious reason is that ENVI consists
>>> of IDL save files. :-)
>>
>> Hold on! Excuse my ignorance, but do this thread and the thing of the
>> 'reverse engineering' mean that anyone having the right tools (eg. the
>> company proprietary of the language) can retrieve the source code from
>> a code.sav file?? Sounds scary...

> Sure the idl code can be recovered, just like you can disassemble any
> executable file. You won't recover the variables names but you can see the
> logic of the code. The question is more whether its worth the effort. I
> would be curious in seeing how it's done but asking myself whether I would
> waste my time on it, the answer is absolutely NO. What's the sense? Even the
> ENVI routines are in the end just implementations of publicly available
> algorithms.

I wouldn't be so sure. Long ago I used to run IDLSPEC, an IDL
benchmark site. To ensure people didn't "game the system" I added a
little checksum to the data, and distributed the routine in a .sav to
prevent peeking. I got an email one day with this section of the code
as I had written it, line by line (well, different capitalization and
block elements, but anyway). It's in there. Variable names, function
calls, etc.

Does anyone aside from ITTVIS use .SAV as some form of proprietary
binary distribution channel? It's sad that all this protectiveness of
their "compiled binary" format may limit the utility of .SAV as a binary
data format.

JD

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[Message index]

		.sav format By: ChristopherFlorio on Mon, 29 January 2007 04:50
		Re: .sav format By: JD Smith on Tue, 30 January 2007 09:58
		Re: .sav format By: Michael Galloy on Tue, 30 January 2007 09:40
		Re: .sav format By: Paolo Grigis on Tue, 30 January 2007 07:36
		Re: .sav format By: Haje Korth on Tue, 30 January 2007 05:21
		Re: .sav format By: Michael Galloy on Mon, 29 January 2007 13:01
		Re: .sav format By: Craig Markwardt on Sat, 03 February 2007 23:04
		Re: .sav format By: JD Smith on Mon, 29 January 2007 12:49
		Re: .sav format By: Haje Korth on Wed, 07 February 2007 05:10
		Re: .sav format By: JD Smith on Tue, 06 February 2007 15:45
		Re: .sav format By: JD Smith on Tue, 06 February 2007 15:44
		Re: .sav format By: Haje Korth on Tue, 06 February 2007 12:00
		Re: .sav format By: Craig Markwardt on Sun, 11 February 2007 13:53
		Re: .sav format By: Guillermo on Tue, 06 February 2007 11:04
		Re: .sav format By: David Fanning on Tue, 06 February 2007 07:42
		Re: .sav format By: Haje Korth on Mon, 05 February 2007 15:02
		Re: .sav format By: JD Smith on Mon, 05 February 2007 12:46
		Re: .sav format By: Haje Korth on Mon, 05 February 2007 10:27
		Re: .sav format By: JD Smith on Mon, 05 February 2007 09:58
		Re: .sav format By: Craig Markwardt on Sun, 11 February 2007 13:47

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