[Kde-pim] Fwd: Re: KDE 4.4.98 (4.4 RC3)

[Thiago Macieira]

Em Segunda-feira 8. Fevereiro 2010, às 21.15.51, Albert Astals Cid escreveu:
> A Dilluns, 8 de febrer de 2010, Thiago Macieira va escriure:
> > Em Domingo 7. Fevereiro 2010, às 16.33.34, argonel escreveu:
> > > On Sun, Feb 7, 2010 at 3:58 AM, Thiago Macieira <thiago at kde.org> wrote:
> > > > The protection has to happen somewhere. Technically, it's
> > > > Konversation's fault
> > > > for passing unfiltered network data into an API.
> > > > 
> > > > But it could also be a QString issue, for allowing those invalid
> > > > UTF-8 strings
> > > > to be converted to UTF-16 in the first place.
> > > > 
> > > > Note that changing the D-Bus behaviour may likely introduce bugs in
> > > > Glib-based
> > > > applications, where conversions from UTF-8 do implement this check.
> > > > (Which, in
> > > > my opinion, is incomplete)
> > > 
> > > If you're referring to dbus's lack of checks for 0x1FFFE and so on, I
> > > found that I was unable to create a QChar > 0xFFFF, so perhaps not
> > > checking those is reasonable.
> > 
> > Of course you can't create a QChar > 0xFFFF.
> > 
> > But QString can handle UTF-16 surrogate pairs and does it just fine. The
> > sequence 0xD83F 0xDFFF is the U+1FFFF non-character.
> > 
> > The question is: should those be allowed to exist in a QString? (I think
> > 
> >  the answer is yes)
> > 
> > Should QString::toUtf8 and fromUtf8 accept those?
> 
> From what i understand, they are not valid UTF-8 (just valid UTF-16) so i
> think the obvious (from the i have no idea of what i'm talking about
> position) is saying "No".

While I agree with you, I have to ask: why?

Why are they valid UTF-16 and valid UCS-4 but not valid UTF-8?

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Development Frameworks
      PGP/GPG: 0x6EF45358; fingerprint:
      E067 918B B660 DBD1 105C  966C 33F5 F005 6EF4 5358
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