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Re: How to extend server side encoding GBK

From: Xiong He <iihero(at)qq(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-hackers <pgsql-hackers(at)postgreSQL(dot)org>
Subject: Re: How to extend server side encoding GBK
Date: 2012-07-02 21:21:13
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Lists: pgsql-hackers
UTF8 is good enough although it needs conversion between client GBK and server side UTF8.  I didn't notice that there are high risk to introduce GBK and similar other kind of charsets into server side.

"=?ISO-8859-1?B?WGlvbmcgSGU=?=" <iihero(at)qq(dot)com> writes:
> I just noticed that PG not support the following encoding: 
> 	/* followings are for client encoding only */
> 	PG_SJIS,					/* Shift JIS (Winindows-932) */
> 	PG_BIG5,					/* Big5 (Windows-950) */
> 	PG_GBK,						/* GBK (Windows-936) */
> 	PG_UHC,						/* UHC (Windows-949) */
> 	PG_GB18030,					/* GB18030 */
> 	PG_JOHAB,					/* EUC for Korean JOHAB */
> 	PG_SHIFT_JIS_2004,			/* Shift-JIS-2004 */
> 	_PG_LAST_ENCODING_			/* mark only */

> But  PG_GBK and PG_GB18030 are very popular in Chinese charset.
> Could anybody give some hints about how to extend it in PG source code?

The reason those aren't supported is that they aren't strict ASCII
supersets, ie there are multibyte characters in which not all the bytes
have the high bit set.  This breaks string-processing assumptions all
over the place.  We are not going to accept any patch that tries to
change that, because it would be too complicated, fragile, and slow.

Is there a reason why it's not good enough to use these just on the
client side, with the server internally using utf8?

			regards, tom lane

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