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Encode::CN - China-based Chinese Encodings
    use Encode qw/encode decode/; 
    $euc_cn = encode("euc-cn", $utf8);   # loads Encode::CN implicitly
    $utf8   = decode("euc-cn", $euc_cn); # ditto
This module implements China-based Chinese charset encodings. Encodings supported are as follows.
  Canonical   Alias             Description
  --------------------------------------------------------------------
  euc-cn      /\beuc.*cn$/i     EUC (Extended Unix Character)
              /\bcn.*euc$/i
              /\bGB[-_ ]?2312(?:\D.*$|$)/i (see below)
  gb2312-raw                    The raw (low-bit) GB2312 character map
  gb12345-raw                   Traditional chinese counterpart to 
                                GB2312 (raw)
  iso-ir-165                    GB2312 + GB6345 + GB8565 + additions
  MacChineseSimp                GB2312 + Apple Additions
  cp936                         Code Page 936, also known as GBK 
                                (Extended GuoBiao)
  hz                            7-bit escaped GB2312 encoding
  --------------------------------------------------------------------
To find how to use this module in detail, see the Encode manpage.
Due to size concerns, GB 18030 (an extension to GBK) is distributed
separately on CPAN, under the name the Encode::HanExtra manpage. That module
also contains extra Taiwan-based encodings.
When you see charset=gb2312 on mails and web pages, they really
mean euc-cn encodings.  To fix that, gb2312 is aliased to euc-cn.
Use gb2312-raw when you really mean it.
The ASCII region (0x00-0x7f) is preserved for all encodings, even though this conflicts with mappings by the Unicode Consortium. See
http://www.debian.or.jp/~kubota/unicode-symbols.html.en
to find out why it is implemented that way.