Re: Searching for an assembly guru

A while back I started writing a DART to DC42 converter to add to The Unarchiver. DART's algorithm is used by another old Mac compression format but I forget which off the top of my head. That said the implementation in The Unarchiver / XADMaster is solid and does not have these bugs and my converter worked but I hadn't finished polishing it up for submission.

I can post my WIP code somewhere tomorrow.

David

> On Apr 16, 2017, at 18:15, Natalia Portillo <claunia_at_email.domain.hidden> wrote:
>
> Hi all,
>
> Ray and I have tried to reverse engineer the DART compression format
> (miscalled LZW).
>
> After several tries, the most promising implementation is what Ray
> already had in libdc42.c, yet, it is incorrect, overflowing the buffer
> in some conditions (very compressable data) generating garbage output on
> decompression.
>
> Thankfully Apple has maintained the algorithm so there are several ways
> to reverse engineer their own code, in classic Mac OS as 68k and PowerPc
> code, or in Mac OS X as PowerPC, i386 and x86_64 code.
>
> However, Ray lacks the time, and I lack the assembly knowledge, to do
> this feat.
>
> That's while I'm searching for help, in someone with the abilities, to
> create a correct reverse engineering, that can be used in GPL/BSD code
> in C for Ray's libdc42 and C# for my DiscImageChef.
>
> I'm asking in the LisaList because, basically, DART has been mostly used
> with Lisa disks, because of its tags support.
>
> So if you have the knowledge, or know who may have it, please, give us
> our help.
>
> Regards,
> Natalia Portillo
>
> P.S.: You don't need to have disassembling experience, I have already
> disassembled DiskCopy 6.1 and DiskImages.Framework.
>
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