From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AFBD8C54FD0 for ; Mon, 27 Apr 2020 15:49:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 88F30206B6 for ; Mon, 27 Apr 2020 15:49:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588002571; bh=XdgBlxAK5lKNtXaEHrrDUXPAQyDBjlt7+S6BvSx/T60=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=NcgVHhDH7g241YsETdbaPYBSc5f3/P83wXDQaNH0w4AWk8s4OmL+MBko3L5P8D4sq 6d09iqVAVouysA6X2WyHy0q4JW2mLM9uzwuHEY8qlmHrdR4vBFrJ86BBzvTlICn/Ni I0t7v6D+pGlYKvfPeirDoRr5U+m3oG+oWz0A8HGg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728449AbgD0Pta (ORCPT ); Mon, 27 Apr 2020 11:49:30 -0400 Received: from mail.kernel.org ([198.145.29.99]:58340 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727006AbgD0Pt3 (ORCPT ); Mon, 27 Apr 2020 11:49:29 -0400 Received: from localhost (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4388E20661; Mon, 27 Apr 2020 15:49:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588002569; bh=XdgBlxAK5lKNtXaEHrrDUXPAQyDBjlt7+S6BvSx/T60=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=yedYM2eNs4wVNJCUIkOc6nDMCNINGso8TUjWAR4Npb0/yqm5QYWl8gEzSRMQW5AXj 8TuhE0o7mo753OEhTMNkjCLhC7p7oLVZuPlS/iIbDR7hJcoQ+xMArX9GjJvWMxVuP/ wRqqpxMLf1IpPmP+Kdxf9G9OZp3tjT1qWoTpIio4= Date: Mon, 27 Apr 2020 11:49:13 -0400 From: Sasha Levin To: Pali =?iso-8859-1?Q?Roh=E1r?= Cc: Valdis =?utf-8?Q?Kl=C4=93tnieks?= , Greg Kroah-Hartman , devel@driverdev.osuosl.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Sasha Levin , Christoph Hellwig Subject: Re: exfat upcase table for code points above U+FFFF (Was: Re: [PATCH] staging: exfat: add exfat filesystem code to staging) Message-ID: <20200427154913.GR13035@sasha-vm> References: <20190829233506.GT5281@sasha-vm> <20190830075647.wvhrx4asnkrfkkwk@pali> <20191016140353.4hrncxa5wkx47oau@pali> <20191016143113.GS31224@sasha-vm> <20191016160349.pwghlg566hh2o7id@pali> <20191016203317.GU31224@sasha-vm> <20191017075008.2uqgdimo3hrktj3i@pali> <20200213000656.hx5wdofkcpg7aoyo@pali> <20200213211847.GA1734@sasha-vm> <20200421213045.skv2dvgm3xuspbl7@pali> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20200421213045.skv2dvgm3xuspbl7@pali> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. -- Thanks, Sasha