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NAMEMail::Message::Body::Encode - organize general message encodings
my Mail::Message $msg = ...; my $decoded = $msg->decoded; my $encoded = $msg->encode(mime_type => 'image/gif', transfer_encoding => 'base64'); my $body = $msg->body; my $decoded = $body->decoded; my $encoded = $body->encode(transfer_encoding => '7bit');
DESCRIPTIONManages the message's body encodings and decodings on request of the main program. This package adds functionality to the Mail::Message::Body class when the decoded() or encode() method is called.
Four types of encodings are handled (in the right order)
Various operating systems have different ideas about how to encode the line termination.UNIXuses aLFcharacter, MacOS uses aCR,and Windows uses aCR/LFcombination. Messages which are transported over Internet will always use theCRLFseparator.
Messages transmitted over Internet have to be plainASCII.Complicated characters and binary files (like images and archives) must be encoded during transmission to anASCIIrepresentation.
The implementation of the required encoders and decoders is found in the Mail::Message::TransferEnc set of packages. The related manual page lists the transfer encodings which are supported.
NOT IMPLEMENTED YET
- charset conversion
Constructing a body
Check the content of the body not to include illegal characters. Which
characters are considered illegal depends on the encoding of this body.
A body is returned which is checked. This may be the body where this method is called upon, but also a new object, when serious changes had to be made. If the check could not be made, because the decoder is not defined, then "undef" is returned.
Encode (translate) a Mail::Message::Body into a different format.
See the DESCRIPTIONabove. Options which are not specified will not trigger conversions.
-Option --Default charset PERL if text mime_type undef result_type <same as source> transfer_encoding undef
- charset => CODESET|'PERL'
If the CODESETis explicitly specified (for instance "iso-8859-10", then the data is interpreted as raw bytes (blob), not as text. However, in case of "PERL", it is considered to be an internal representation of characters (either latin1 or Perl's utf8 --not the same as utf-8--, you should not know).
- mime_type => STRING|FIELD
Convert into the specified mime type, which can be specified as STRINGorFIELD.TheFIELDis a Mail::Message::Field, and theSTRINGis converted in such object before use.
- result_type => CLASS
The type of body to be created when the body is changed to fulfill the request
on re-coding. Also the intermediate stages in the translation process (if
needed) will use this type. CLASSmust extend Mail::Message::Body.
- transfer_encoding => STRING|FIELD
- charset => CODESET|'
- Encode the body to a format what is acceptable to transmit or write to a folder file. This returns the body where this method was called upon when everything was already prepared, or a new encoded body otherwise. In either case, the body is checked.
Unify the type of the given $body objects with the type of the called
body. "undef" is returned when unification is impossible. If the
bodies have the same settings, the $body object is returned unchanged.
my $bodytype = Mail::Message::Body::Lines; my $html = $bodytype->new(mime_type=>'text/html', data => ); my $plain = $bodytype->new(mime_type=>'text/plain', ...); my $unified = $html->unify($plain); # $unified is the data of plain translated to html (if possible).
About the payload
- $obj->dispositionFilename( [$directory] )
Returns the name which can be used as filename to store the information
in the indicated $directory. To get a filename, various fields are searched
for "filename" and "name" attributes. Without $directory, the name found
will be returned.
Only the basename of the found name will be used, for security reasons: otherwise, it may be possible to access other directories than the one indicated. If no name was found, or the name is already in use, then an unique name is generated.
- Returns true when the un-encoded message is binary data. This information is retrieved from knowledge provided by MIME::Types.
- Returns true when the un-encoded message contains printable text.
- $obj->addTransferEncHandler( $name, <$class|$object> )
- Mail::Message::Body->addTransferEncHandler( $name, <$class|$object> )
Relate the NAMEd transfer encoding to an OBJECTs or object of the specified
$class. In the latter case, an object of that $class will be created on the
moment that one is needed to do encoding or decoding.
The $class or $object must extend Mail::Message::TransferEnc. It will replace existing class and object for this $name.
Why aren't you contributing this class to MailBox?
- Get the transfer encoder/decoder which is able to handle $type, or return undef if there is no such handler.
- Warning: Charset $name is not known
- The encoding or decoding of a message body encounters a character set which is not understood by Perl's Encode module.
- Warning: No decoder defined for transfer encoding $name.
- The data (message body) is encoded in a way which is not currently understood, therefore no decoding (or recoding) can take place.
- Warning: No encoder defined for transfer encoding $name.
- The data (message body) has been decoded, but the required encoding is unknown. The decoded data is returned.
SEE ALSOThis module is part of Mail-Box distribution version 2.120, built on September 21, 2016. Website: perl.overmeer.net/mailbox
LICENSECopyrights 2001-2016 by [Mark Overmeer]. For other contributors see ChangeLog.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See www.perl.com/perl/misc/Artistic.html