Re: What is the maximum encoding-conversion growth rate, anyway? - Mailing list pgsql-hackers

From Michael Fuhr
Subject Re: What is the maximum encoding-conversion growth rate, anyway?
Date
Msg-id 20070529035356.GA67336@winnie.fuhr.org
Whole thread Raw
In response to Re: What is the maximum encoding-conversion growth rate, anyway?  (Tom Lane <tgl@sss.pgh.pa.us>)
Responses Re: What is the maximum encoding-conversion growth rate, anyway?  (Tatsuo Ishii <ishii@postgresql.org>)
List pgsql-hackers
On Mon, May 28, 2007 at 10:23:42PM -0400, Tom Lane wrote:
> Tatsuo Ishii <ishii@postgresql.org> writes:
> > I'm afraid we have to mke it larger, rather than smaller for 8.3. For
> > example 0x82f5 in SHIFT_JIS_2004 (new in 8.3) becomes *pair* of 3
> > bytes UTF_8 (0x00e3818b and 0x00e3829a). See
> > util/mb/Unicode/shift_jis_2004_to_utf8_combined.map for more details.
> 
> > So the worst case is now 6, rather than 3.
> 
> Yipes.

Isn't MAX_CONVERSION_GROWTH a multiplier?  Doesn't 2 bytes becoming
2 * 3 bytes represent a growth of 3, not 6?  Or does that 2-byte
SHIFT_JIS_2004 sequence have a 1-byte sequence in another supported
encoding?  Or am I missing something?

-- 
Michael Fuhr


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