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.\" ========================================================================
.\"
.IX Title "MIME::QuotedPrint 3"
.TH MIME::QuotedPrint 3 "2019-10-24" "perl v5.30.2" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
MIME::QuotedPrint \- Encoding and decoding of quoted\-printable strings
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& use MIME::QuotedPrint;
\&
\& $encoded = encode_qp($decoded);
\& $decoded = decode_qp($encoded);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module provides functions to encode and decode strings into and from the
quoted-printable encoding specified in \s-1RFC 2045\s0 \- \fI\s-1MIME\s0 (Multipurpose
Internet Mail Extensions)\fR.  The quoted-printable encoding is intended
to represent data that largely consists of bytes that correspond to
printable characters in the \s-1ASCII\s0 character set.  Each non-printable
character (as defined by English Americans) is represented by a
triplet consisting of the character \*(L"=\*(R" followed by two hexadecimal
digits.
.PP
The following functions are provided:
.ie n .IP "encode_qp( $str)" 4
.el .IP "encode_qp( \f(CW$str\fR)" 4
.IX Item "encode_qp( $str)"
.PD 0
.ie n .IP "encode_qp( $str, $eol)" 4
.el .IP "encode_qp( \f(CW$str\fR, \f(CW$eol\fR)" 4
.IX Item "encode_qp( $str, $eol)"
.ie n .IP "encode_qp( $str, $eol, $binmode )" 4
.el .IP "encode_qp( \f(CW$str\fR, \f(CW$eol\fR, \f(CW$binmode\fR )" 4
.IX Item "encode_qp( $str, $eol, $binmode )"
.PD
This function returns an encoded version of the string ($str) given as
argument.
.Sp
The second argument ($eol) is the line-ending sequence to use.  It is
optional and defaults to \*(L"\en\*(R".  Every occurrence of \*(L"\en\*(R" is replaced
with this string, and it is also used for additional \*(L"soft line
breaks\*(R" to ensure that no line end up longer than 76 characters.  Pass
it as \*(L"\e015\e012\*(R" to produce data suitable for external consumption.
The string \*(L"\er\en\*(R" produces the same result on many platforms, but not
all.
.Sp
The third argument ($binmode) will select binary mode if passed as a
\&\s-1TRUE\s0 value.  In binary mode \*(L"\en\*(R" will be encoded in the same way as
any other non-printable character.  This ensures that a decoder will
end up with exactly the same string whatever line ending sequence it
uses.  In general it is preferable to use the base64 encoding for
binary data; see MIME::Base64.
.Sp
An \f(CW$eol\fR of "\*(L" (the empty string) is special.  In this case, no \*(R"soft
line breaks\*(L" are introduced and binary mode is effectively enabled so
that any \*(R"\en" in the original data is encoded as well.
.ie n .IP "decode_qp( $str )" 4
.el .IP "decode_qp( \f(CW$str\fR )" 4
.IX Item "decode_qp( $str )"
This function returns the plain text version of the string given
as argument.  The lines of the result are \*(L"\en\*(R" terminated, even if
the \f(CW$str\fR argument contains \*(L"\er\en\*(R" terminated lines.
.PP
If you prefer not to import these routines into your namespace, you can
call them as:
.PP
.Vb 3
\&  use MIME::QuotedPrint ();
\&  $encoded = MIME::QuotedPrint::encode($decoded);
\&  $decoded = MIME::QuotedPrint::decode($encoded);
.Ve
.PP
Perl v5.8 and better allow extended Unicode characters in strings.
Such strings cannot be encoded directly, as the quoted-printable
encoding is only defined for single-byte characters.  The solution is
to use the Encode module to select the byte encoding you want.  For
example:
.PP
.Vb 2
\&    use MIME::QuotedPrint qw(encode_qp);
\&    use Encode qw(encode);
\&
\&    $encoded = encode_qp(encode("UTF\-8", "\ex{FFFF}\en"));
\&    print $encoded;
.Ve
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 1995\-1997,2002\-2004 Gisle Aas.
.PP
This library is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
MIME::Base64