How to make iconv worked in Emacs?

[wen@japan.email.ne.jp]

Hi,
Now iconv can tranform gb into big5 by "iconv -f gb2312 -t big5".
I think it is possible to make it worked in Emacs. Would someone
please tell me how to do it? Thanks.

Regards,

--Wen
wen@japan.email.ne.jp