From: Bjoern Hoehrmann (email@example.com)
Date: Mon Apr 13 2009 - 00:14:15 CDT
I've written a simple UTF-8 decoding function that processes a single
byte at a time while the caller maintains its state. As such it is much
easier to use correctly in many situations. What makes this feasible is
having only about a dozen instructions in the function, so it is easily
inlined. For work in progress implementation and documentation see:
Essentially it uses a specially constructed table-driven DFA for state
transitions, so the decoding function just does table lookups and the
usual bit magic. To verify that this approach is sound, I have timed a
simple transcoder against some popular UTF-8 to UTF-16 transcoders.
Results are somewhat compiler-, and, I imagine, architecture-specific,
but my implementation appears to come out nicely given its simplicity.
See the web page for results on my system.
-- Björn Höhrmann · mailto:firstname.lastname@example.org · http://bjoern.hoehrmann.de Am Badedeich 7 · Telefon: +49(0)160/4415681 · http://www.bjoernsworld.de 25899 Dagebüll · PGP Pub. KeyID: 0xA4357E78 · http://www.websitedev.de/
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