linux-kernel - exfat upcase table for code points above U+FFFF (Was: Re: [PATCH] staging: exfat: add exfat filesystem code to staging)

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Message-ID: <20200421213045.skv2dvgm3xuspbl7@pali>
Date:   Tue, 21 Apr 2020 23:30:45 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Sasha Levin <sashal@...nel.org>
Cc:     Valdis Klētnieks <valdis.kletnieks@...edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Sasha Levin <alexander.levin@...rosoft.com>,
        Christoph Hellwig <hch@...radead.org>
Subject: exfat upcase table for code points above U+FFFF (Was: Re: [PATCH]
 staging: exfat: add exfat filesystem code to staging)

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?