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Re: u32_normalize UNINORM_NFKC on 0xD800

From: Bruno Haible
Subject: Re: u32_normalize UNINORM_NFKC on 0xD800
Date: Fri, 27 May 2011 19:42:42 +0200
User-agent: KMail/1.9.9

Simon Josefsson wrote:
> I'm calculating this IDNA2008 property
>    toNFKC(toCaseFold(toNFKC(cp))) != cp
> for all code points.

It makes no sense to consider non-character code points here. Citing again
the Unicode standard, chapter 3 [1], section 3.8:

  "High-surrogate and low-surrogate code units are used only in the context
   of the UTF-16 character encoding form."

> Is this impossible to do with the u32_normalize interface?

Yes, you are passing invalid input to the u32_normalize function.


[1] http://www.unicode.org/versions/Unicode6.0.0/ch03.pdf

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