File Coverage

blib/lib/MIME/QuotedPrint/Perl.pm

Criterion	Covered	Total	%
statement	34	34	100.0
branch	9	10	90.0
condition	3	6	50.0
subroutine	4	4	100.0
pod	2	2	100.0
total	52	56	92.8

package MIME::QuotedPrint::Perl;

# $Id: Perl.pm,v 1.2 2004/01/14 12:52:44 gisle Exp $

use strict;
use vars qw(@ISA @EXPORT $VERSION);
if (ord('A') == 193) { # on EBCDIC machines we need translation help
    require Encode;
}

require Exporter;
@ISA = qw(Exporter);
@EXPORT = qw(encode_qp decode_qp);

$VERSION = "1.00";

my $RE_Z = "\\z";
$RE_Z = "\$" if $] < 5.005;

sub encode_qp ($;$)
{
    my $res = shift;
    if ($] >= 5.006) {
	require bytes;
	if (bytes::length($res) > length($res) ||
	    ($] >= 5.008 && $res =~ /[^\0-\xFF]/))
	{
	    require Carp;
	    Carp::croak("The Quoted-Printable encoding is only defined for bytes");
	}
    }

    my $eol = shift;
    $eol = "\n" unless defined $eol;

    # Do not mention ranges such as $res =~ s/([^ \t\n!-<>-~])/sprintf("=%02X", ord($1))/eg;
    # since that will not even compile on an EBCDIC machine (where ord('!') > ord('<')).
    if (ord('A') == 193) { # EBCDIC style machine
        if (ord('[') == 173) {
            $res =~ s/([^ \t\n!"#\$%&'()*+,\-.\/0-9:;<>?\@A-Z[\\\]^_`a-z{|}~])/sprintf("=%02X", ord(Encode::encode('iso-8859-1',Encode::decode('cp1047',$1))))/eg;  # rule #2,#3
            $res =~ s/([ \t]+)$/
              join('', map { sprintf("=%02X", ord(Encode::encode('iso-8859-1',Encode::decode('cp1047',$_)))) }
        		   split('', $1)
              )/egm;                        # rule #3 (encode whitespace at eol)
        }
        elsif (ord('[') == 187) {
            $res =~ s/([^ \t\n!"#\$%&'()*+,\-.\/0-9:;<>?\@A-Z[\\\]^_`a-z{|}~])/sprintf("=%02X", ord(Encode::encode('iso-8859-1',Encode::decode('posix-bc',$1))))/eg;  # rule #2,#3
            $res =~ s/([ \t]+)$/
              join('', map { sprintf("=%02X", ord(Encode::encode('iso-8859-1',Encode::decode('posix-bc',$_)))) }
        		   split('', $1)
              )/egm;                        # rule #3 (encode whitespace at eol)
        }
        elsif (ord('[') == 186) {
            $res =~ s/([^ \t\n!"#\$%&'()*+,\-.\/0-9:;<>?\@A-Z[\\\]^_`a-z{|}~])/sprintf("=%02X", ord(Encode::encode('iso-8859-1',Encode::decode('cp37',$1))))/eg;  # rule #2,#3
            $res =~ s/([ \t]+)$/
              join('', map { sprintf("=%02X", ord(Encode::encode('iso-8859-1',Encode::decode('cp37',$_)))) }
        		   split('', $1)
              )/egm;                        # rule #3 (encode whitespace at eol)
        }
    }
    else { # ASCII style machine
        $res =~  s/([^ \t\n!"#\$%&'()*+,\-.\/0-9:;<>?\@A-Z[\\\]^_`a-z{|}~])/sprintf("=%02X", ord($1))/eg;  # rule #2,#3
	$res =~ s/\n/=0A/g unless length($eol);
        $res =~ s/([ \t]+)$/
          join('', map { sprintf("=%02X", ord($_)) }
    		   split('', $1)
          )/egm;                        # rule #3 (encode whitespace at eol)
    }

    return $res unless length($eol);

    # rule #5 (lines must be shorter than 76 chars, but we are not allowed
    # to break =XX escapes.  This makes things complicated :-( )
    my $brokenlines = "";
    $brokenlines .= "$1=$eol"
	while $res =~ s/(.*?^[^\n]{73} (?:
		 [^=\n]{2} (?! [^=\n]{0,1} $) # 75 not followed by .?\n
		|[^=\n]    (?! [^=\n]{0,2} $) # 74 not followed by .?.?\n
		|          (?! [^=\n]{0,3} $) # 73 not followed by .?.?.?\n
	    ))//xsm;
    $res =~ s/\n$RE_Z/$eol/o;

    "$brokenlines$res";
}


sub decode_qp ($)
{
    my $res = shift;
    $res =~ s/\r\n/\n/g;            # normalize newlines
    $res =~ s/[ \t]+\n/\n/g;        # rule #3 (trailing space must be deleted)
    $res =~ s/=\n//g;               # rule #5 (soft line breaks)
    if (ord('A') == 193) { # EBCDIC style machine
        if (ord('[') == 173) {
            $res =~ s/=([\da-fA-F]{2})/Encode::encode('cp1047',Encode::decode('iso-8859-1',pack("C", hex($1))))/ge;
        }
        elsif (ord('[') == 187) {
            $res =~ s/=([\da-fA-F]{2})/Encode::encode('posix-bc',Encode::decode('iso-8859-1',pack("C", hex($1))))/ge;
        }
        elsif (ord('[') == 186) {
            $res =~ s/=([\da-fA-F]{2})/Encode::encode('cp37',Encode::decode('iso-8859-1',pack("C", hex($1))))/ge;
        }
    }
    else { # ASCII style machine
        $res =~ s/=([\da-fA-F]{2})/pack("C", hex($1))/ge;
    }
    $res;
}

1;

__END__