You might be interested in looking at:

• http://www.mandarintools.com, it has an entry named Chinese Perl Library, and a Perl based Chinese Encoding Guesser.
• The Perl, Unicode and I18N FAQ.

Disclaimer: I have no practical experience in doing these conversions, I just searched for tools.

Christian Lemburg
Brainbench MVP for Perl
http://www.brainbench.com