2 # $Id: QuotedPrint.pm,v 2.3 1997/12/02 10:24:27 aas Exp $
4 package MIME::QuotedPrint;
8 MIME::QuotedPrint - Encoding and decoding of quoted-printable strings
12 use MIME::QuotedPrint;
14 $encoded = encode_qp($decoded);
15 $decoded = decode_qp($encoded);
19 This module provides functions to encode and decode strings into the
20 Quoted-Printable encoding specified in RFC 2045 - I<MIME (Multipurpose
21 Internet Mail Extensions)>. The Quoted-Printable encoding is intended
22 to represent data that largely consists of bytes that correspond to
23 printable characters in the ASCII character set. Non-printable
24 characters (as defined by english americans) are represented by a
25 triplet consisting of the character "=" followed by two hexadecimal
28 The following functions are provided:
34 This function will return an encoded version of the string given as
37 Note that encode_qp() does not change newlines C<"\n"> to the CRLF
38 sequence even though this might be considered the right thing to do
39 (RFC 2045 (Q-P Rule #4)).
41 =item decode_qp($str);
43 This function will return the plain text version of the string given
49 If you prefer not to import these routines into your namespace you can
52 use MIME::QuotedPrint ();
53 $encoded = MIME::QuotedPrint::encode($decoded);
54 $decoded = MIME::QuotedPrint::decode($encoded);
58 Copyright 1995-1997 Gisle Aas.
60 This library is free software; you can redistribute it and/or
61 modify it under the same terms as Perl itself.
66 use vars qw(@ISA @EXPORT $VERSION);
70 @EXPORT = qw(encode_qp decode_qp);
72 $VERSION = sprintf("%d.%02d", q$Revision: 2.3 $ =~ /(\d+)\.(\d+)/);
78 $res =~ s/([^ \t\n!-<>-~])/sprintf("=%02X", ord($1))/eg; # rule #2,#3
80 join('', map { sprintf("=%02X", ord($_)) }
82 )/egm; # rule #3 (encode whitespace at eol)
84 # rule #5 (lines must be shorter than 76 chars, but we are not allowed
85 # to break =XX escapes. This makes things complicated :-( )
87 $brokenlines .= "$1=\n"
88 while $res =~ s/(.*?^[^\n]{73} (?:
89 [^=\n]{2} (?! [^=\n]{0,1} $) # 75 not followed by .?\n
90 |[^=\n] (?! [^=\n]{0,2} $) # 74 not followed by .?.?\n
91 | (?! [^=\n]{0,3} $) # 73 not followed by .?.?.?\n
101 $res =~ s/[ \t]+?(\r?\n)/$1/g; # rule #3 (trailing space must be deleted)
102 $res =~ s/=\r?\n//g; # rule #5 (soft line breaks)
103 $res =~ s/=([\da-fA-F]{2})/pack("C", hex($1))/ge;
107 # Set up aliases so that these functions also can be called as
109 # MIME::QuotedPrint::encode();
110 # MIME::QuotedPrint::decode();
112 *encode = \&encode_qp;
113 *decode = \&decode_qp;