Re: Server-side support of all encodings

At Korea, Johab code is very old encondig.
by the way, cp949 code page is really used in most environments.

Personally speaking, Johab server code set is not need.
I think that PostgreSQL supports UHC (cp949) server  code set.
This feature will be greet many Korean. :)
Unfortunately, UHC code set have character sequences less then 128 byte.

I tred to patch this problem, but this is not simply. I had gave up. :(


----- Original Message ----- 
From: "ITAGAKI Takahiro" <itagaki.takahiro@oss.ntt.co.jp>
To: "Tom Lane" <tgl@sss.pgh.pa.us>
Cc: <pgsql-hackers@postgresql.org>
Sent: Monday, March 26, 2007 11:29 AM
Subject: Re: [HACKERS] Server-side support of all encodings


>
> Tom Lane <tgl@sss.pgh.pa.us> wrote:
>
>> > PostgreSQL suppots SJIS, BIG5, GBK, UHC and GB18030 as client 
>> > encodings,
>> > but we cannot use them as server encodings. Are there any reason for 
>> > it?
>>
>> Very much so --- they aren't safe ASCII-supersets, and thus for example
>> the parser will fail on them.  Backend encodings must have the property
>> that all bytes of a multibyte character are >= 128.
>
> But then, PG_JOHAB have already infringed it. Please see 
> johab_to_utf8.map.
> Trailing bytes of JOHAB can be less than 128.
> It's true that other server-supported encodings use only characters >= 
> 128.
>
> Regards,
> ---
> ITAGAKI Takahiro
> NTT Open Source Software Center
>
>
>
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