[cifs-protocol] [REG: 111081578094589] Explanation about the LZNT1 compression scheme in FRS1.

[Edgar Olougouna]

Matthieu,

Yes, there will be an update to MS-FRS1. The product team is looking into the most appropriate way to reflect this in the document. In the "Lempel-Ziv Compression in Windows.pdf" document communicated in my previous email, there is a generic example on how to work out the Lempel-Ziv compression and decompression in Windows.

Regards,
Edgar

-----Original Message-----
From: Matthieu Patou [mailto:mat at samba.org] 
Sent: Monday, August 29, 2011 6:11 PM
To: Edgar Olougouna
Cc: cifs-protocol at samba.org; pfif at tridgell.net
Subject: Re: [REG: 111081578094589] Explanation about the LZNT1 compression scheme in FRS1.

Hi, Edgar,

Can we expect some updates of FRS1 with for instance a example of the compressed and then uncompressed data ?

Matthieu.

On 29/08/2011 23:24, Edgar Olougouna wrote:
> Matthieu,
>
> Your observation is correct. Windows implementation of the Lempel-Ziv compression algorithm is based on the original algorithm in [UASDC]. However, Windows modifies the basic algorithm as detailed in the attached document "Lempel-Ziv Compression in Windows.pdf".
>
> [UASDC] Ziv, J. and Lempel, A., "A Universal Algorithm for Sequential Data Compression", May 1977, http://ieeexplore.ieee.org/iel5/18/22696/01055714.pdf.
>
> Regards,
> Edgar
>
> -----Original Message-----
> From: Edgar Olougouna
> Sent: Monday, August 22, 2011 7:34 PM
> To: mat at samba.org
> Cc: cifs-protocol at samba.org; pfif at tridgell.net
> Subject: RE: [REG: 111081578094589] Explanation about the LZNT1 compression scheme in FRS1.
>
> Matthieu,
>
> We are actively working on this issue. I will update you as soon as we complete our investigation. Thank you for your patience.
>
> Regards,
> Edgar
>
> -----Original Message-----
> From: Matthieu Patou
> Sent: Monday, August 22, 2011 6:29 PM
> To: Edgar Olougouna
> Cc: cifs-protocol at samba.org; pfif at tridgell.net
> Subject: Re: [REG: 111081578094589] Explanation about the LZNT1 compression scheme in FRS1.
>
>
> Hi Edgar,
>
> Have you any news on this ?
>
> Thanks.
>
> Matthieu.
>
> On 17/08/2011 19:49, Edgar Olougouna wrote:
>> [Adding case number in subject]
>>
>> Matthieu,
>>
>> I have taken ownership of this issue. I will update you as soon as we complete our investigation.
>>
>> Thanks,
>> Edgar
>>
>> -----Original Message-----
>> From: Edgar Olougouna
>> Sent: Monday, August 15, 2011 4:44 PM
>> To: mat at samba.org; cifs-protocol at samba.org; pfif at tridgell.net
>> Subject: RE: Explanation about the LZNT1 compression scheme in FRS1.
>>
>> [Dochelp to bcc]
>>
>> Matthieu,
>>
>> I have created the case number 111081578094589 to track this request. One of our team members will follow-up soon.
>>
>> Thanks,
>> Edgar
>>
>> -----Original Message-----
>> From: Matthieu Patou [mailto:mat at samba.org]
>> Sent: Monday, August 15, 2011 4:22 PM
>> To: Interoperability Documentation Help; cifs-protocol at samba.org; 
>> pfif at tridgell.net
>> Subject: Explanation about the LZNT1 compression scheme in FRS1.
>>
>> Hello,
>>
>> MS-FRS1.pdf indicate that LZNT1 compression is used and point to
>> http://go.microsoft.com/fwlink/?LinkId=90549 for explanations.
>>
>> But this link only describe the Zif&   Lampel method for loss-less compression. It seems that compressed data that comes after the STAGE_HEADER is mostly following this method but that there is some headers associated.
>>
>> If it's not an impression can it be documented, if it's just an impression can you show in the example like 4.4.7 PDC Sends Out CMD_RECEIVING_STAGE how to pass from the compressed content to the uncompressed content ?
>>
>> Thanks.
>>
>> Matthieu.
>>
>>
>> --
>> Matthieu Patou
>> Samba Team        http://samba.org
>> Private repo      http://git.samba.org/?p=mat/samba.git;a=summary
>>
>>
>>
>>
>
> --
> Matthieu Patou
> Samba Team        http://samba.org
> Private repo      http://git.samba.org/?p=mat/samba.git;a=summary
>
>
>


--
Matthieu Patou
Samba Team        http://samba.org
Private repo      http://git.samba.org/?p=mat/samba.git;a=summary