SquirrelMail decoding functions are used to display and convert messages
encoded in different character sets. Extra decoding library provides support
of some complex Eastern character sets and some rarely used Apple character
sets. Current release supports Big5, Windows-874 (cp874, Thai), Windows-949
(UHC, Korean), EUC-CN, EUC-JP, EUC-KR, EUC-TW, GB18030, GB2312, ISO-2022-CN,
ISO-2022-JP, ISO-2022-JP-2, ISO-2022-KR, Shift_JIS and various x-mac-*
character sets.