On Friday 06 May 2016 09:24:01 Karl Williamson wrote: > On 05/05/2016 08:37 AM, Pali Rohár wrote: > >Hi! > > > >I though that I understand UTF-8 encoding/decoding done in perl until I > >looked into source code of Encode package... (exactly sub encode_utf8) > > > >Before... I only read description of Encode package (not source code): > >https://metacpan.org/pod/Encode#UTF-8-vs.-utf8-vs.-UTF8 > > > >I tried to find some more information (ideally those which answer my > >question) but without success. Can you help me? My questions are: > > > >1. What is difference between those two calls? > > > > utf8::encode($str); > > > >and > > > > $str = Encode::encode('utf8', $str); > > > >2. What is difference between those? > > > > utf8::decode($str); > > $str = Encode::decode_utf8($str); > > Each pair of functions is supposed to do essentially the same thing. I have > not studied them to know what subtle differences there may be.
If both functions should do same thing, why we have duplicity? And which one is preferred to use? > >3. Where is implementation of utf8::encode/decode functions? It is not > >in utf8.pm, nor in utf8_heavy.pl and also not in unicore/Heavy.pl. And > >what those functions doing? > > The implementation is in universal.c. But these are just wrappers for > sv_utf8_encode and sv_utf8_decode, which are implemented in sv.c. Their > documentation is in perlapi. It should match the documentation of > utf8::decode and utf8::encode, whose documentation is in utf8.pm. (I myself > have a hard time mapping the names chosen for these operations with what > they actually do) Ok, thank you! -- Pali Rohár pali.ro...@gmail.com
