From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-fsdevel-owner@vger.kernel.org>
Received: from mail-pl0-f44.google.com ([209.85.160.44]:35398 "EHLO
        mail-pl0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1753217AbdK1Ru1 (ORCPT
        <rfc822;linux-fsdevel@vger.kernel.org>);
        Tue, 28 Nov 2017 12:50:27 -0500
Received: by mail-pl0-f44.google.com with SMTP id b96so365662pli.2
        for <linux-fsdevel@vger.kernel.org>; Tue, 28 Nov 2017 09:50:27 -0800 (PST)
Message-ID: <1511891425.2822.10.camel@dubeyko.com>
Subject: Re: [PATCH] hfsplus: fix decomposition of Hangul characters
From: Viacheslav Dubeyko <slava@dubeyko.com>
To: Hin-Tak Leung <htl10@users.sourceforge.net>,
        "Ernesto A." =?ISO-8859-1?Q?Fern=E1ndez?=
        <ernesto.mnd.fernandez@gmail.com>
Cc: linux-fsdevel@vger.kernel.org, tchou <tchou@synology.com>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Andrew Morton <akpm@linux-foundation.org>
Date: Tue, 28 Nov 2017 09:50:25 -0800
In-Reply-To: <1999104027.7153972.1511885718712@mail.yahoo.com>
References: <1999104027.7153972.1511885718712.ref@mail.yahoo.com>
         <1999104027.7153972.1511885718712@mail.yahoo.com>
Content-Type: text/plain; charset="UTF-8"
Mime-Version: 1.0
Content-Transfer-Encoding: 8bit
Sender: linux-fsdevel-owner@vger.kernel.org
List-ID: <linux-fsdevel.vger.kernel.org>

On Tue, 2017-11-28 at 16:15 +0000, Hin-Tak Leung wrote:
> --------------------------------------------
> On Tue, 28/11/17, Ernesto A. Fernández <ernesto.mnd.fernandez@gmail.c
> om> wrote:
> 
> > 
> > The algorithm is very simple, the best way to
> > understand it is just
> > looking at the code. I
> > don't know the first thing about Korean writing, so
> > I don't think I should attempt to explain
> > why the decomposition is done
> > this way. If
> > somebody else is interested in the details, they can
> > follow
> > the citation in the header comment of
> > the decompose_hangul function.
>  
> Apologies for coming into this a bit late.
> 
> A couple of points:
> 
> 1. Hangul canonical composition and decomposition is a separate topic
> from compositions of latin characters with accents. It is described
> in 
> 
>  http://www.unicode.org/reports/tr15/tr15-18.html#Hangul
> 
> among other sources.
> 
> 2. I think the mount option is a bit of a red-herring. I think we
> should just do what Mac OS X does - I think in the tech note it says
> something about storing things always in the decomposed form or
> composed form. Ideally we should make the differing mount options no-
> ops. Mac OS X does not need extra mount options, we shouldn't either.

Do you mean the using of textEncoding field in the Volume Header or/and
textEncoding in the Ctalog Folder's records? But I am not completelely
sure what flag can be Hangul related. Do you have any hints?

Thanks,
Vyacheslav Dubeyko.