[Coco] I give up on .ar files

Robert Gault robert.gault at worldnet.att.net
Wed Feb 20 07:46:57 EST 2008


Neil Morrison wrote:
> 
> I once tried to figure out the algorithms used with little success. 
> Anyone else?
> 
> Neil
> 
> ----- Original Message ----- From: "L. Curtis Boyle" 
> <curtisboyle at sasktel.net>
> 
>> Does the command run ok on it's own (can you get a help screen by 
>> typeing 'AR -?', for example)? I am wondering if it is a attributes 
>> thing, or if it is a different version of AR (!.3, 1.4 and 2.0 all had 
>> different, incompatible schemes).
> 

Ar uses an lz compression scheme. I have a distribution for AR13 that is 
just C-language source code.

As to changes between versions, it may just be a single byte in the 
header sections. That is true for ar12 and ar13 where byte $4E in each 
header is 2 or 3 respectively.



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