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Bug with UTF-8 character

From: Hans-Jürgen Schönig <postgres(at)cybertec(dot)at>
To: pgsql-hackers(at)postgresql(dot)org, eg(at)cybertec(dot)at
Subject: Bug with UTF-8 character
Date: 2006-05-26 06:21:56
Message-ID: 44769E84.7000006@cybertec.at (view raw or flat)
Thread:
Lists: pgsql-hackers
good morning,

I got a bug request for the following unicode character in PostgreSQL 
8.1.4: 0xedaeb8

ERROR:  invalid byte sequence for encoding "UTF8": 0xedaeb8

This one seemed to work properly in PostgreSQL 8.0.3.

I think the following code in postgreSQL 814 has a bug in it.

File: postgresql-8.1.4/src/backend/utils/mb/wchar.c


The entry values to the function are:

source = ed ae b8 20 20 20 20 20 20 20 20 20 20 20 20

length = 3 (length is the length of current utf-8 character)

But the code does a check where the second character should not be 
greater than 0x9F, when first character is 0xED. This is not according 
to UTF-8 standard in RFC 3629. I believe that is not a valid test.

This test fails on our string, when it shouldn’t.

I believe this is a bug, could you please confirm or let me know what I 
am doing wrong.


	Many thanks,

		Hans


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