Re: mangling scheme
On Mon, 2002-09-09 at 08:33, Lucas Correia Villa Real wrote: Hi, Recently I did find a little trouble in a program: it creates links to the most recently used files, but using the not-so-'default' Win9X mangling scheme, that is, 'program files' becomes 'progra~1' and not 'progr~-1'. This seem to me the correct behaviour, why do you think it should be progr~1 ? I did a search over the samba archives and noticed some patches and discussions about performance and even about non-compliance between Win9x and WinNT mangling methods. Is there a working* patch to do that kind of stuff? If not, can someone point me to the algorithms used by Win9X/NT to do that? Will such a patch be welcome by Samba? I extendedly tested the w2k alghorithms, that I suppose are the same as NT, and they seem to use the 6chars+~1 through ~5 and then they start to produce a poor hash based name like prA9BF~1 that is clearly a 2 bytes lenght hex representation. The exact alghorithm is not known to me, but we tested that it is really poor and prone to lot of name collisions. We implemented a new mangling alghorithm for HEAD called hash2 that is pretty good. Look at smbd/mangle_hash2.c if you are curious. About patches they are always welcome, but to be accepted they need to address a real problem and get it the right way, what do you have in mind exactly? Thanks in advance, Lucas * performance is not a problem in my target network, so anything will be really welcome :) I have some code for a tdb based persistent mangling db that could help but it is not ready yet and broken in little pieces part of new code and part of code from an older not very good implementation. Simo. -- Simo Sorce - [EMAIL PROTECTED] Xsec s.r.l. via Durando 10 Ed. G - 20158 - Milano tel. +39 02 2399 7130 - fax: +39 02 700 442 399 signature.asc Description: This is a digitally signed message part
Re: mangling scheme
On 09 Sep 2002 09:27:21 +0200 Simo Sorce [EMAIL PROTECTED] wrote: On Mon, 2002-09-09 at 08:33, Lucas Correia Villa Real wrote: Hi, Recently I did find a little trouble in a program: it creates links to the most recently used files, but using the not-so-'default' Win9X mangling scheme, that is, 'program files' becomes 'progra~1' and not 'progr~-1'. This seem to me the correct behaviour, why do you think it should be progr~1 ? Sorry, I think I was misunderstood here. What the program do is to address 'program files' into 'progra~1', the same way as the WinNT server was doing, but with Samba the same entry become 'progr~-1', using the hash1 algorithm. I did a search over the samba archives and noticed some patches and discussions about performance and even about non-compliance between Win9x and WinNT mangling methods. Is there a working* patch to do that kind of stuff? If not, can someone point me to the algorithms used by Win9X/NT to do that? Will such a patch be welcome by Samba? I extendedly tested the w2k alghorithms, that I suppose are the same as NT, and they seem to use the 6chars+~1 through ~5 and then they start to produce a poor hash based name like prA9BF~1 that is clearly a 2 bytes lenght hex representation. The exact alghorithm is not known to me, but we tested that it is really poor and prone to lot of name collisions. We implemented a new mangling alghorithm for HEAD called hash2 that is pretty good. Look at smbd/mangle_hash2.c if you are curious. About patches they are always welcome, but to be accepted they need to address a real problem and get it the right way, what do you have in mind exactly? I just got the sources, and as far as I could see, that's exactly what I was looking for. I will put it in action today. I have some code for a tdb based persistent mangling db that could help but it is not ready yet and broken in little pieces part of new code and part of code from an older not very good implementation. Thanks for your attention, if I feel I will need to use a different scheme I will try to give a look at it. Lucas
Re: mangling scheme
However this is a strange behaviour, generally apps should not try to guess by it's own the mangling scheme but ask the system to tell them which is the short name other wise the application is poorly made. Have you migrated an installation by chance? That may explain the problem, many installations do save 8.3 paths in registry after the system has told them which is the mangled name, so may be you can simply tweak your registry to reflect the correct name. Simo. On Mon, 2002-09-09 at 10:26, Lucas Correia Villa Real wrote: On 09 Sep 2002 09:27:21 +0200 Simo Sorce [EMAIL PROTECTED] wrote: On Mon, 2002-09-09 at 08:33, Lucas Correia Villa Real wrote: Hi, Recently I did find a little trouble in a program: it creates links to the most recently used files, but using the not-so-'default' Win9X mangling scheme, that is, 'program files' becomes 'progra~1' and not 'progr~-1'. This seem to me the correct behaviour, why do you think it should be progr~1 ? Sorry, I think I was misunderstood here. What the program do is to address 'program files' into 'progra~1', the same way as the WinNT server was doing, but with Samba the same entry become 'progr~-1', using the hash1 algorithm. I did a search over the samba archives and noticed some patches and discussions about performance and even about non-compliance between Win9x and WinNT mangling methods. Is there a working* patch to do that kind of stuff? If not, can someone point me to the algorithms used by Win9X/NT to do that? Will such a patch be welcome by Samba? I extendedly tested the w2k alghorithms, that I suppose are the same as NT, and they seem to use the 6chars+~1 through ~5 and then they start to produce a poor hash based name like prA9BF~1 that is clearly a 2 bytes lenght hex representation. The exact alghorithm is not known to me, but we tested that it is really poor and prone to lot of name collisions. We implemented a new mangling alghorithm for HEAD called hash2 that is pretty good. Look at smbd/mangle_hash2.c if you are curious. About patches they are always welcome, but to be accepted they need to address a real problem and get it the right way, what do you have in mind exactly? I just got the sources, and as far as I could see, that's exactly what I was looking for. I will put it in action today. I have some code for a tdb based persistent mangling db that could help but it is not ready yet and broken in little pieces part of new code and part of code from an older not very good implementation. Thanks for your attention, if I feel I will need to use a different scheme I will try to give a look at it. Lucas -- Simo Sorce - [EMAIL PROTECTED] Xsec s.r.l. via Durando 10 Ed. G - 20158 - Milano tel. +39 02 2399 7130 - fax: +39 02 700 442 399 signature.asc Description: This is a digitally signed message part
mangling scheme
Hi, Recently I did find a little trouble in a program: it creates links to the most recently used files, but using the not-so-'default' Win9X mangling scheme, that is, 'program files' becomes 'progra~1' and not 'progr~-1'. I did a search over the samba archives and noticed some patches and discussions about performance and even about non-compliance between Win9x and WinNT mangling methods. Is there a working* patch to do that kind of stuff? If not, can someone point me to the algorithms used by Win9X/NT to do that? Will such a patch be welcome by Samba? Thanks in advance, Lucas * performance is not a problem in my target network, so anything will be really welcome :)
