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Transcoding MIME Strings

by PoorLuzer (Beadle)
on Oct 09, 2009 at 18:08 UTC ( #800354=perlquestion: print w/replies, xml ) Need Help??
PoorLuzer has asked for the wisdom of the Perl Monks concerning the following question:

I have been handling some email related process recently, mainly with processing information from the raw mail headers.

What I want to understand are: 1. how to map strings like these:

=?iso-8859-1?Q?Communiqu=E9?= =?iso-8859-1?Q?Telef=F3nica?= =?ISO-8859-1?Q?Montre=E1l?= =?iso-8859-1?Q?Minist=E8re?=

to these:

Communique Telefonica Montreal Ministere

I get the same, unhelpful (does not help me get the desired mappings above), results regardless of whether I use:

use MIME::Words qw(:all); my $rawSub = $head->get( 'subject' ); my $mailSubject = decode_mimewords( $rawSub );
or I use:

use MIME::WordDecoder; my $wd = supported MIME::WordDecoder "US-ASCII"; ### Decode a MIME string (e.g., into Latin1) via the default decod +er: my $str = $wd->decode( $rawSub ); print $str, "\n";

For some reason that I am unable to understand, the following fails completely (the output shows me the unknown character designator '_' for any character!):

use MIME::WordDecoder; my $wd = new MIME::WordDecoder::US_ASCII; $wd->unknown( '_' ); # What to translate unknown characters to $wd->collapse( 1 ); # Collapse runs of unknown characters to a sin +gle unknown print $wd->decode( $rawSub ), "\n";

2. How do I make Date::Manip::UnixDate completely ignore the timezone part of the date string?

Here is some code:

use Date::Manip; Date_Init( "ConvTZ=IGNORE", "TZ=GMT" ); # We don't want time conve +rsions happening. GMailBackup ignores timezone conformance and keeps +timestamps as they were # If using Date::Transform, you can use '%g' that is short for %a, + %d %b %Y %H:%M:%S %z - Fri, 28 Apr 1995 17:23:15 EDT; For eg : Sat, +9 Feb 2008 17:04:08 -0330 $mailDate = UnixDate( $mailDate , '%Y_%m_%Q-%H%M%S' ); # 2008_02_2 +0080209-170408

For this example, consider the date string:

Sat, 9 Feb 2008 17:04:08 -0380

The timezone in the string is clearly bogus (minutes value > 60); yet this happens in "real life".

As evident from the code, I don't need the timezone information anyways. So how do I "lop it off" (is it recommended?) reliably?

I would rather have someone tell me a magic flag that I am unaware of that makes the UnixDate ignore the timezone as "chopping it off" promises to complicate life even more (time zones can be in different formats. Eg : EET, -330, +710, etc)

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Re: Transcoding MIME Strings
by zwon (Abbot) on Oct 09, 2009 at 18:24 UTC

    The following code produces desired output:

    use strict; use warnings; use 5.010; use MIME::WordDecoder; use open ':encoding(utf8)'; use open ':std'; my $wd = supported MIME::WordDecoder "iso-8859-1"; for my $enc ( '=?iso-8859-1?Q?Communiqu=E9?=', '=?iso-8859-1?Q?Telef=F3nica?=', '=?ISO-8859-1?Q?Montre=E1l?=', '=?iso-8859-1?Q?Minist=E8re?=' ) { say $wd->decode($enc); } __END__ Communiqué Telefónica Montreál Ministère

    Update: and MIME::Words gives me the same output:

    use strict; use warnings; use 5.010; use open ':utf8'; use open ':std'; use MIME::Words qw(:all); my @encoded = ( '=?iso-8859-1?Q?Communiqu=E9?=', '=?iso-8859-1?Q?Telef=F3nica?=', '=?ISO-8859-1?Q?Montre=E1l?=', '=?iso-8859-1?Q?Minist=E8re?=', ); for (@encoded) { say scalar decode_mimewords($_); }
      I wanted :

      Communique Telefonica Montreal Ministere

      instead of :

      Communiqué Telefónica Montreál Ministère
      That is the problem I am trying to solve - I want the output to be in the "ASCII" character set.

        You could transliterate into ASCII in a second step, e.g. using Text::Unidecode:

        #!/usr/bin/perl use strict; use warnings; use MIME::Words qw(:all); use Text::Unidecode; my @encoded = ( '=?iso-8859-1?Q?Communiqu=E9?=', '=?iso-8859-1?Q?Telef=F3nica?=', '=?ISO-8859-1?Q?Montre=E1l?=', '=?iso-8859-1?Q?Minist=E8re?=', ); for (@encoded) { my $s = decode_mimewords($_); print unidecode($s), "\n"; } __END__ Communique Telefonica Montreal Ministere
Re: Transcoding MIME Strings
by PoorLuzer (Beadle) on Oct 10, 2009 at 02:12 UTC
    any insights into the second question of the timezone issue?

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