[cifs-protocol] [EXTERNAL] Is MS-XCA LZ-77 plain compression the same as MS-DRSR DRS_COMP_ALG_WIN2K3 compression? - TrackingID#2211280040006230

[Douglas Bagnall]

hi Obaid,

Yes, that answers the question, at least to "easy to answer" threshold.

It looks to me like they may once have been intended to be the same but 
have diverged, which doesn't matter in practice because they don't talk to 
each other. I don't need to know any more than this now.

thank you,
Douglas


On 3/12/22 13:10, Obaid Farooqi wrote:
> Hi Douglas:
> The MS-DRSR uses a different API than what MS-XCA uses.
> 
> Please let me know if this does not answer your question.
> 
> Regards,
> Obaid Farooqi
> Escalation Engineer | Microsoft
> 
> -----Original Message-----
> From: Tom Jebo <tomjebo at microsoft.com>
> Sent: Monday, November 28, 2022 11:02 AM
> To: Douglas Bagnall <douglas.bagnall at catalyst.net.nz>; cifs-protocol at lists.samba.org
> Cc: Microsoft Support <supportmail at microsoft.com>
> Subject: RE: [EXTERNAL] Is MS-XCA LZ-77 plain compression the same as MS-DRSR DRS_COMP_ALG_WIN2K3 compression? - TrackingID#2211280040006230
> 
> [dochelp to bcc]
> [support mail to cc]
> 
> Hi Douglas,
> 
> Thanks for you request regarding MS-XCA. One of the Open Specifications team members will respond to assist you. In the meantime, we’ve created case 2211280040006230 to track this request. Please leave the case number in the subject when communicating with our team about this request.
> 
> Best regards,
> Tom Jebo
> Microsoft Open Specifications Support
> 
> -----Original Message-----
> From: Douglas Bagnall <douglas.bagnall at catalyst.net.nz>
> Sent: Sunday, November 27, 2022 7:30 PM
> To: Interoperability Documentation Help <dochelp at microsoft.com>; cifs-protocol at lists.samba.org
> Subject: [EXTERNAL] Is MS-XCA LZ-77 plain compression the same as MS-DRSR DRS_COMP_ALG_WIN2K3 compression?
> 
> hi Dochelp,
> 
> Hopefully this will be simple to answer.
> 
> The algorithm in MS-XCA 2.3 and 2.4 "Plain LZ77" looks quite a lot like the one in MS-DRSR 4.1.10.5.21 "CompressOrDecompressWin2k3" or "LZ77 + DIRECT2", although they are described using entirely different words.
> 
> (MS-WUSP and MS-OXCRPC also have something similar).
> 
> If this is *not* easy to answer, I am happy to accept a "maybe". At this stage I am just curious.
> 
> cheers,
> Douglas
>