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Groups > comp.unix.programmer > #13662
| From | Rainer Weikusat <rweikusat@talktalk.net> |
|---|---|
| Newsgroups | comp.unix.programmer |
| Subject | Re: UTF-8 overlong encodings |
| Date | 2021-12-20 19:30 +0000 |
| Message-ID | <875yrjhy5i.fsf@doppelsaurus.mobileactivedefense.com> (permalink) |
| References | (2 earlier) <87mtkx6di7.fsf@doppelsaurus.mobileactivedefense.com> <87sfuppku0.fsf@bsb.me.uk> <87tuf446mh.fsf@doppelsaurus.mobileactivedefense.com> <87ee68lyhn.fsf@bsb.me.uk> <87a6gvi10g.fsf@doppelsaurus.mobileactivedefense.com> |
Rainer Weikusat <rweikusat@talktalk.net> writes:
> Ben Bacarisse <ben.usenet@bsb.me.uk> writes:
[...]
>> I don't see why you need to look at the next byte.
>>
>>> if (!x) { /* x == 0 implies u_len > 2 */
>>
>> x == 0 implies an overlong sequence now that you have dealt with the
>> length 2 case which can have one bit on x set and still be overlong.
>
> According to the Linux man page, a number in the range 0x800 - 0xffff is
> encoded as three bytes:
>
> 1110xxxx 10xxxxxx 10xxxxxx
>
> Program encoding 0x800 in this way:
[...]
> And the output is e0 a0 80.
Addition: Not technically a proof of correctness but the ActionCable
(rot in hell) UTF-8 checker I have to placate accepts 0xe0 0xa0 0x80 as
valid UTF-8 sequence.
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UTF-8 overlong encodings Rainer Weikusat <rweikusat@talktalk.net> - 2021-12-17 22:55 +0000
Re: UTF-8 overlong encodings Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-12-18 00:04 +0000
Re: UTF-8 overlong encodings Rainer Weikusat <rweikusat@talktalk.net> - 2021-12-18 17:15 +0000
Re: UTF-8 overlong encodings Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-12-18 23:14 +0000
Re: UTF-8 overlong encodings Rainer Weikusat <rweikusat@talktalk.net> - 2021-12-19 21:39 +0000
Re: UTF-8 overlong encodings Rainer Weikusat <rweikusat@talktalk.net> - 2021-12-19 21:53 +0000
Re: UTF-8 overlong encodings Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-12-20 03:57 +0000
Re: UTF-8 overlong encodings Rainer Weikusat <rweikusat@talktalk.net> - 2021-12-20 18:28 +0000
Re: UTF-8 overlong encodings Rainer Weikusat <rweikusat@talktalk.net> - 2021-12-20 19:30 +0000
Re: UTF-8 overlong encodings Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-12-20 20:46 +0000
Re: UTF-8 overlong encodings Rainer Weikusat <rweikusat@talktalk.net> - 2021-12-20 21:24 +0000
Re: UTF-8 overlong encodings Nicolas George <nicolas$george@salle-s.org> - 2021-12-20 13:34 +0000
Re: UTF-8 overlong encodings Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2021-12-17 16:37 -0800
Re: UTF-8 overlong encodings Rainer Weikusat <rweikusat@talktalk.net> - 2021-12-18 17:19 +0000
Re: UTF-8 overlong encodings John McCue <jmccue@fuzzball.mhome.org> - 2021-12-19 00:49 +0000
Re: UTF-8 overlong encodings Nicolas George <nicolas$george@salle-s.org> - 2021-12-20 09:42 +0000
Re: UTF-8 overlong encodings Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2021-12-20 10:56 -0800
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