#!/usr/bin/perl


sub encode_qp ($)
{
    my $res = shift;
    $res =~ s/([^ \t\n!-<>-~])/sprintf("=%02X", ord($1))/eg;  # rule #2,#3
    $res =~ s/([ \t]+)$/
      join('', map { sprintf("=%02X", ord($_)) }
                   split('', $1)
      )/egm;                        # rule #3 (encode whitespace at 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=\n"
        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;

    "$brokenlines$res";
}


while (<>)
{
        print encode_qp($_);
}