From: | Bruce Momjian <bruce(at)momjian(dot)us> |
---|---|
To: | Heikki Linnakangas <hlinnaka(at)iki(dot)fi> |
Cc: | Arjen Nienhuis <a(dot)g(dot)nienhuis(at)gmail(dot)com>, pgsql-bugs(at)postgresql(dot)org |
Subject: | Re: BUG #12845: The GB18030 encoding doesn't support Unicode characters over 0xFFFF |
Date: | 2015-05-01 01:13:15 |
Message-ID: | 20150501011315.GC6342@momjian.us |
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Lists: | pgsql-bugs |
On Tue, Mar 10, 2015 at 11:33:43PM +0100, Heikki Linnakangas wrote:
> >I can write a "uint32 UTF8toGB18030(uint32)" function, but I don't know
> >where to put it in the code.
>
> The mapping functions are in src/backend/utils/mb/conversion_procs/utf8_and_gb18030/utf8_and_gb18030.c.
> They currently just consult the mapping table. You'd need to modify
> them to also check if the codepoint is in one of those linear
> ranges, and do the mapping for those programmatically.
>
> >Else I could also extend the map file. It would double in size if it only
> >needs to include valid code points.
>
> The current mapping table contains about 63000 mappings, but there
> are over a million valid code points that need to be mapped. If you
> just add every one-to-one mapping to the table, it's going to blow
> up in size to over 8 MB. I don't think we want that, handling the
> ranges with linear mappings programmatically makes a lot more sense.
Should this be a TODO entry?
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ Everyone has their own god. +
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