linux-kernel - Re: vfat: Broken case-insensitive support for UTF-8

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Message-ID: <87muahov0l.fsf@mail.parknet.co.jp>
Date:   Tue, 21 Jan 2020 21:26:34 +0900
From:   OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:     Pali Rohár <pali.rohar@...il.com>
Cc:     "Theodore Y. Ts'o" <tytso@....edu>, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, Namjae Jeon <linkinjeon@...il.com>,
        Gabriel Krisman Bertazi <krisman@...labora.com>
Subject: Re: vfat: Broken case-insensitive support for UTF-8

Pali Rohár <pali.rohar@...il.com> writes:

> On Tuesday 21 January 2020 12:52:50 OGAWA Hirofumi wrote:
>> BTW, VFAT has to store the both of shortname (codepage) and longname
>> (UTF16), and using both names to open a file. So Windows should be using
>> current locale codepage to make shortname even latest Windows for VFAT.
>
> fastfat.sys stores into shortnames only 7bit characters. Which is same
> in all OEM codepages. Non-7bit are replaced by underline or shortened by
> "~N" syntax. According to source code of fastfat.sys it has some
> registry option to allow usage also of full 8bit OEM codepage.
>
> So default behavior seems to be safe.

Are you sure if default is 7bit only? I'm pretty sure, at least, old
Windows version stored 8bit chars by default install.

Thanks.
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>