From: "Pali Rohár" <pali@kernel.org>
To: Sasha Levin <sashal@kernel.org>
Cc: devel@driverdev.osuosl.org,
"Christoph Hellwig" <hch@infradead.org>,
"Valdis Klētnieks" <valdis.kletnieks@vt.edu>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
linux-kernel@vger.kernel.org,
"Sasha Levin" <alexander.levin@microsoft.com>,
linux-fsdevel@vger.kernel.org
Subject: Re: exfat upcase table for code points above U+FFFF (Was: Re: [PATCH] staging: exfat: add exfat filesystem code to staging)
Date: Tue, 28 Apr 2020 09:46:53 +0200 [thread overview]
Message-ID: <20200428074653.kcq6ibj6rjlrnau7@pali> (raw)
In-Reply-To: <20200427154913.GR13035@sasha-vm>
On Monday 27 April 2020 11:49:13 Sasha Levin wrote:
> On Tue, Apr 21, 2020 at 11:30:45PM +0200, Pali Rohár wrote:
> > On Thursday 13 February 2020 16:18:47 Sasha Levin wrote:
> > > On Thu, Feb 13, 2020 at 01:06:56AM +0100, Pali Rohár wrote:
> > > > In released exFAT specification is not written how are Unicode code
> > > > points above U+FFFF represented in exFAT upcase table. Normally in
> > > > UTF-16 are Unicode code points above U+FFFF represented by surrogate
> > > > pairs but compression format of exFAT upcase table is not clear how to
> > > > do it there.
> > > >
> > > > Are you able to send question about this problem to relevant MS people?
> > > >
> > > > New Linux implementation of exfat which is waiting on mailing list just
> > > > do not support Unicode code points above U+FFFF in exFAT upcase table.
> > >
> > > Sure, I'll forward this question on. I'll see if I can get someone from
> > > their team who could be available to answer questions such as these in
> > > the future - Microsoft is interested in maintaining compatiblity between
> > > Linux and Windows exFAT implementations.
> >
> > Hello Sasha! Have you got any answer from exfat MS team about upcase
> > table for Unicode code points above U+FFFF?
>
> Sorry for taking so long. This is my understanding from the Windows
> folks: Windows filesystems just don't support variable encoding length,
> and expect UCS-2 strings.
Ok, so should I understand your answer as exFAT upcase table does not
support representing Unicode code points above U+FFFF and therefore
exFAT implementation should expect that toupper(u) = u and tolower(u) = u
for any Unicode code point u in range [U+10000, U+10FFFF]? This is how
current exfat linux driver behave.
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next prev parent reply other threads:[~2020-04-28 7:46 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190828160817.6250-1-gregkh@linuxfoundation.org>
[not found] ` <20190829205631.uhz6jdboneej3j3c@pali>
2019-08-30 15:40 ` [PATCH] staging: exfat: add exfat filesystem code to staging Christoph Hellwig
2019-08-30 15:43 ` Pali Rohár
[not found] ` <184209.1567120696@turing-police>
[not found] ` <20190829233506.GT5281@sasha-vm>
[not found] ` <20190830075647.wvhrx4asnkrfkkwk@pali>
2019-10-16 14:03 ` Pali Rohár
2019-10-16 14:31 ` Sasha Levin
2019-10-16 16:03 ` Pali Rohár
2019-10-16 16:20 ` Sasha Levin
2019-10-16 16:22 ` Greg Kroah-Hartman
2019-10-16 16:32 ` Pali Rohár
2019-10-16 16:50 ` Greg Kroah-Hartman
2019-10-16 20:33 ` Sasha Levin
2019-10-16 21:53 ` Valdis Klētnieks
2019-10-17 7:53 ` Pali Rohár
2019-10-17 7:50 ` Pali Rohár
2020-02-13 0:06 ` Pali Rohár
2020-02-13 21:18 ` Sasha Levin
2020-02-14 22:16 ` Valdis Klētnieks
2020-02-14 22:43 ` Pali Rohár
2020-02-14 23:25 ` Valdis Klētnieks
2020-04-21 21:30 ` exfat upcase table for code points above U+FFFF (Was: Re: [PATCH] staging: exfat: add exfat filesystem code to staging) Pali Rohár
2020-04-27 15:49 ` Sasha Levin
2020-04-28 7:46 ` Pali Rohár [this message]
2019-10-16 16:05 ` [PATCH] staging: exfat: add exfat filesystem code to staging Valdis Klētnieks
[not found] ` <20190828170022.GA7873@kroah.com>
[not found] ` <20190829062340.GB3047@infradead.org>
[not found] ` <20190829063955.GA30193@kroah.com>
[not found] ` <20190829094136.GA28643@infradead.org>
[not found] ` <20190829095019.GA13557@kroah.com>
[not found] ` <20190829103749.GA13661@infradead.org>
[not found] ` <20190829111810.GA23393@kroah.com>
2019-08-30 15:36 ` Christoph Hellwig
2019-08-30 21:54 ` Dave Chinner
2019-08-31 10:31 ` Valdis Klētnieks
2019-09-01 0:04 ` Dave Chinner
[not found] ` <20190829151144.GJ23584@kadam>
[not found] ` <20190829152757.GA125003@architecture4>
[not found] ` <20190829154346.GK23584@kadam>
[not found] ` <cd38b645-2930-3e02-6c6a-5972ea02b537@huawei.com>
[not found] ` <20190830115142.GM2752@twin.jikos.cz>
2019-08-31 3:50 ` Chao Yu
2019-09-14 13:39 ` [PATCH] staging: exfat: add exfat filesystem code to Park Ju Hyung
2019-09-15 13:54 ` Greg KH
2019-09-15 16:11 ` Ju Hyung Park
[not found] ` <20190918195920.25210-1-qkrwngud825@gmail.com>
2019-09-18 20:12 ` [PATCH] staging: exfat: rebase to sdFAT v2.2.0 Greg KH
2019-09-18 20:13 ` Greg KH
2019-09-18 20:22 ` Ju Hyung Park
2019-09-18 20:26 ` Greg KH
2019-09-18 20:31 ` Ju Hyung Park
2019-09-18 20:46 ` Valdis Klētnieks
2019-09-18 21:31 ` kbuild test robot
2019-09-18 21:31 ` kbuild test robot
2019-09-18 22:17 ` Ju Hyung Park
2019-10-24 9:39 ` [PATCH] staging: exfat: add exfat filesystem code to staging Pali Rohár
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