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Perl version 5.10.0 documentation - Encode::MIME::Header
NAME
Encode::MIME::Header -- MIME 'B' and 'Q' header encoding
SYNOPSIS
use Encode qw/encode decode/;
$utf8
= decode('MIME-Header', $header);
$header = encode('MIME-Header', $utf8);
ABSTRACT
This module implements RFC 2047 Mime Header Encoding. There are 3 variant encoding names;
MIME-Header, MIME-B
and
MIME-Q.
The difference is described below
decode()
encode()
----------------------------------------------
MIME-Header Both B and Q
=?UTF-8?B?....?=
MIME-B
B only; Q croaks =?UTF-8?B?....?=
MIME-Q
Q only; B croaks =?UTF-8?Q?....?=
DESCRIPTION
When you decode(=?encoding?X?ENCODED
WORD?=), ENCODED WORD
is extracted and
decoded for
X
encoding (B for Base64, Q for Quoted-Printable). Then the decoded chunk is fed to
decode(encoding). So long as
encoding
is supported by Encode, any source encoding is fine.
When you encode, it just encodes UTF-8 string with
X
encoding then quoted with =?UTF-8?X?....?= .
The parts that RFC 2047 forbids to encode are left as is and long lines are folded within 76 bytes per
line.
BUGS
It would be nice to support encoding to non-UTF8, such as =?ISO-2022-JP? and =?ISO-8859-1?= but
that makes the implementation too complicated. These days major mail agents all support =?UTF-8?
so I think it is just good enough.
Due to popular demand, 'MIME-Header-ISO_2022_JP' was introduced by Makamaka. Thre are still
too many MUAs especially cellular phone handsets which does not grok UTF-8.
SEE ALSO
Encode
RFC 2047,
http://www.faqs.org/rfcs/rfc2047.html
and many other locations.
http://perldoc.perl.org
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