Encode::JP

Section: Perl Programmers Reference Guide (3perl)
Updated: 2019-04-20
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NAME

Encode::JP - Japanese Encodings

SYNOPSIS

    use Encode qw/encode decode/; 
    $euc_jp = encode("euc-jp", $utf8);   # loads Encode::JP implicitly
    $utf8   = decode("euc-jp", $euc_jp); # ditto

ABSTRACT

This module implements Japanese charset encodings. Encodings supported are as follows.

  Canonical   Alias             Description
  --------------------------------------------------------------------
  euc-jp      /\beuc.*jp$/i     EUC (Extended Unix Character)
              /\bjp.*euc/i   
          /\bujis$/i
  shiftjis    /\bshift.*jis$/i  Shift JIS (aka MS Kanji)
          /\bsjis$/i
  7bit-jis    /\bjis$/i         7bit JIS
  iso-2022-jp                   ISO-2022-JP                  [RFC1468]
                = 7bit JIS with all Halfwidth Kana 
                  converted to Fullwidth
  iso-2022-jp-1                 ISO-2022-JP-1                [RFC2237]
                                = ISO-2022-JP with JIS X 0212-1990
                  support.  See below
  MacJapanese                   Shift JIS + Apple vendor mappings
  cp932       /\bwindows-31j$/i Code Page 932
                                = Shift JIS + MS/IBM vendor mappings
  jis0201-raw                   JIS0201, raw format
  jis0208-raw                   JIS0201, raw format
  jis0212-raw                   JIS0201, raw format
  --------------------------------------------------------------------

DESCRIPTION

To find out how to use this module in detail, see Encode.

Note on ISO-2022-JP(-1)?

ISO-2022-JP-1 (RFC2237) is a superset of ISO-2022-JP (RFC1468) which adds support for JIS X 0212-1990. That means you can use the same code to decode to utf8 but not vice versa.

  $utf8 = decode('iso-2022-jp-1', $stream);

and

  $utf8 = decode('iso-2022-jp',   $stream);

yield the same result but

  $with_0212 = encode('iso-2022-jp-1', $utf8);

is now different from

  $without_0212 = encode('iso-2022-jp', $utf8 );

In the latter case, characters that map to 0212 are first converted to U+3013 (0xA2AE in EUC-JP; a white square also known as 'Tofu' or 'geta mark') then fed to the decoding engine. U+FFFD is not used, in order to preserve text layout as much as possible.

BUGS

The ASCII region (0x00-0x7f) is preserved for all encodings, even though this conflicts with mappings by the Unicode Consortium.