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File name : demime.pl

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#! /usr/bin/perl -w
# $Id: demime.pl,v 1.5 2004-02-12 20:38:18 william Exp $

use 5.0;

use strict 'vars';

use Getopt::Long;

# Patched to pass through envelope "From_" - 11/14/2000 tneff

$::PRESERVE_UNIX_FROM_LINE = 1;
# $::MAJIC_PIPE_PREFIX_CHAR = '==';
$::MAJIC_PIPE_PREFIX_CHAR = '|';
$::junkmail_file = "/dh/etc/demime/demime_junkmail.cf";
$::debug = 0;
$::debuginput = "";
$::quiet = 0;
# Following configuration variable controls whether plain
# text sections are scanned for typical advertising footers.
$::AD_REMOVE = 1;

# Following controls whether only 7 bit output
# from message body sections should be done.
$::SEVEN_BIT_ONLY = 0;

# Following configuration variable controls whether a message/rfc822
# in a multipart/mixed main segment is rendered or elided.
$::EXPAND_MULTIPART_RFC822_SECTION = 1;
#$::eliderfc822 = ! $::EXPAND_MULTIPART_RFC822_SECTION;

$::relayto = '';

$::WARNINGS_TO_SYSLOG = 1;

# The following error output controls what happens to "no displayable section" errors.
$::RETURN_ERRORS_TO_ORIGIN = 0;

if(defined &Getopt::Long::Configure) {
  Getopt::Long::Configure('gnu_compat');
  #Getopt::Long::Configure('debug');
  Getopt::Long::Configure('pass_through');

$::goresult = 
	GetOptions(
		   '' => sub {
		       if($::relayto ne '') 
		       { die "output target '-' specified after $::relayto already specified";};
		       $::relayto = '-' },
		   'preservefrom!' => \$::PRESERVE_UNIX_FROM_LINE,
		   'p' => \$::PRESERVE_UNIX_FROM_LINE,
		   'x|prefixchar=s' => \$::MAJIC_PIPE_PREFIX_CHAR,
		   'd|debug+' => \$::debug,
		   'f|forwarderror!' => \$::RETURN_ERRORS_TO_ORIGIN,
		   'i|debuginput=s' => sub { shift; 
					     $::debuginput = shift;
					     $::debug ++; },
		   'j|junkmail_file=s' => sub { shift;
						$::junkmail_file = shift;
						$::AD_REMOVE = 1; },
		   'adremove!' => \$::AD_REMOVE,
		   'a' => \$::AD_REMOVE, 
		   '7bit!' => \$::SEVEN_BIT_ONLY,
		   'quiet!' => \$::quiet,
		   '7' => \$::SEVEN_BIT_ONLY,
		   'uselynx' => \$::uselynx,
		   '8|8bit' => sub { $::SEVEN_BIT_ONLY = 0 },
		   'eliderfc822!' => \$::eliderfc822,
		   'w|warnings_to_syslog:i' => \$::WARNINGS_TO_SYSLOG,
		   '<>' => sub { my $arg = shift; if ($::relayto ne '') { die "positional parameter $arg specified after $::relayto already specified"; }; $::relayto = $arg;}  );
} else {
    $::goresult = 
	GetOptions(
		   '' => sub {
		       if($::relayto ne '') 
		       { die "output target '-' specified after $::relayto already specified";};
		       $::relayto = '-' },
		   'preservefrom!' => \$::PRESERVE_UNIX_FROM_LINE,
		   'p' => \$::PRESERVE_UNIX_FROM_LINE,
		   'x|prefixchar=s' => \$::MAJIC_PIPE_PREFIX_CHAR,
		   'd|debug' => \$::debug,
		   'f|forwarderror!' => \$::RETURN_ERRORS_TO_ORIGIN,
		   'i|debuginput=s' => sub { shift; 
					     $::debuginput = shift;
					     $::debug ++; },
		   'j|junkmail_file=s' => sub { shift;
						$::junkmail_file = shift;
						$::AD_REMOVE = 1; },
		   'adremove!' => \$::AD_REMOVE,
		   'a' => \$::AD_REMOVE, 
		   '7bit!' => \$::SEVEN_BIT_ONLY,
		   'quiet!' => \$::quiet,
		   '7' => \$::SEVEN_BIT_ONLY,
		   'uselynx' => \$::uselynx,
		   '8|8bit' => sub { $::SEVEN_BIT_ONLY = 0 },
		   'eliderfc822!' => \$::eliderfc822,
		   'w|warnings_to_syslog:i' => \$::WARNINGS_TO_SYSLOG,
		   '<>' => sub { my $arg = shift; if ($::relayto ne '') { die "positional parameter $arg specified after $::relayto already specified"; }; $::relayto = $arg;}  );
}
if($::quiet) { 
    $main::nowarn = 1;
}

$::EXPAND_MULTIPART_RFC822_SECTION = !$::eliderfc822;
		       
# $WARNINGS_TO_SYSLOG = value 0 -> Skip special warning processing.
#                       value 1 -> Warnings go to syslog if STDERR is 
#                                  not a tty.
#                       value 2 -> All warnings go to syslog.

if($::WARNINGS_TO_SYSLOG == -1) {
    $::WARNINGS_TO_SYSLOG = $::debug?0:1;
}

if($::WARNINGS_TO_SYSLOG != 0 && $::WARNINGS_TO_SYSLOG != 1 && 
   $::WARNINGS_TO_SYSLOG != 2) {
    warn "-w or --warnings_to_sylog must be set to 0, 1, or 2 - forcing to ".$::debug?0:1;
   $::WARNINGS_TO_SYSLOG = $::debug?0:1;
}

$::RETURN_ERRORS_TO_ORIGIN = ! $::RETURN_ERRORS_TO_ORIGIN;

no strict 'vars';

$ENV{'PATH'} = '/bin:/usr/bin:/sbin:/usr/sbin';
delete @ENV{qw(IFS CDPATH ENV BASH_ENV)};   # Make %ENV safer

sub BEGIN {
    $SIG{'__WARN__'} = 
	sub {
	    return if $_[0] =~ /^\QConstant subroutine __need___va_list undefined\E/;
	    warn $_[0];
	};
}

eval {
    require "sysexits.ph";		# Values to return to sendmail with.
};
if ($@) {
    sub EX_OK { return 0; }; # successful termination;
sub EX__BASE { return 64; }; # base value for error messages

sub EX_USAGE { return 64; }; # command line usage error
sub EX_DATAERR { return 65; }; # data format error
sub EX_NOINPUT { return 66; }; # cannot open input
sub EX_NOUSER { return 67; }; # addressee unknown
sub EX_NOHOST { return 68; }; # host name unknown
sub EX_UNAVAILABLE { return 69; }; # service unavailable
sub EX_SOFTWARE { return 70; }; # internal software error
sub EX_OSERR { return 71; }; # system error (e.g., can't fork)
sub EX_OSFILE { return 72; }; # critical OS file missing
sub EX_CANTCREAT { return 73; }; # can't create (user) output file
sub EX_IOERR { return 74; }; # input/output error
sub EX_TEMPFAIL { return 75; }; # temp failure; user is invited to retry
sub EX_PROTOCOL { return 76; }; # remote error in protocol
sub EX_NOPERM { return 77; }; # permission denied
sub EX_CONFIG { return 78; }; # configuration error
}

if(!$::goresult) {
    print "Remaining args are @ARGV\n";

exit &EX_TEMPFAIL; # option processing failed.
}

#print STDERR "Relayto is $::relayto, Remaining args are @ARGV ",0+@ARGV,"\n";

$demime_version = "demime 1.01d";

sub my_setsyslog ($) {
    my ($WARNINGS_TO_SYSLOG) = shift;

if($WARNINGS_TO_SYSLOG == 2 or ($WARNINGS_TO_SYSLOG == 1 and not -t STDERR)) {
	use Sys::Syslog qw(:DEFAULT);
	if ($] > 5.00402) {
	    if(defined Sys::Syslog::_PATH_LOG and -p Sys::Syslog::_PATH_LOG) {
	      Sys::Syslog::setlogsock('unix') if defined Sys::Syslog::setlogsock;
	    }
	}
	openlog("demime", "pid", "mail");
	$SIG{"__WARN__"} = 
	    sub {
		unless (defined $^S) { # Special startup processing.
		    warn $_[0];
		    return;
		}
		syslog('mail|warning', "%s", $_[0]);
	    };
        $SIG{"__DIE__"} = 
            sub {
		if ((defined $^S) and not $^S) { # Not beginning and not
		    # Inside an eval....log the message.
		    syslog("mail|err", "%s", $_[0]); # Report top level dies.
		}
		die $_[0];		# You meant to die, right?
	    };
   } else {
        $SIG{"__WARN__"} = 'DEFAULT';
        $SIG{"__DIE__"} = 'DEFAULT';
   }
}

# The following variable controls the header printing --- set off if
# demime is currently parsing a multipart/related.

$::print_extra_headers = 1;

my_setsyslog($::WARNINGS_TO_SYSLOG);

if(! $::uselynx) {

eval {
    
    require HTML::FormatText;

package HTML::myFormatText;

# This is a subclass of the HTML::FormatText object.  See the man page
# for credit and attribution.  
# This subclassing is done solely to change the margins so that the HTML
# text won't be indented when formatted.

@ISA = qw(HTML::FormatText);

use strict;

sub begin {
        my $self = shift;
        $self->HTML::FormatText::begin;
        $self->{lm} = 0;
        $self->{rm} = 72;
    }

};

if($@) {
        $::uselynx =1;
    } else {
        $::uselynx = 0;
    }
}

package main;

no strict;

# Lookahead subroutine declarations - put them all here.

sub mail_print (@);
sub mail_body_print (@);
sub mail_body_flush ();
sub parse822(\@$$);		# Required to force reference construction.
sub decode_base64(\@);
sub linepush ($\$$);

# MAINLINE logic restarts here.

if ($::relayto eq '') {
    $::relayto = shift;
}

unless (defined $::relayto and $::relayto ne '') {	# Check argument
    warn "One argument required - the relay to address.\n";
    exit &EX_USAGE;
}
$| = 1; select STDERR; $| = 1; select STDOUT; # Unbuffered - mostly for debuggery.

# Read the whole mail message in, in one fell swoop.  This could be
# problematic if the message is really huge.

if(defined $debuginput and $debuginput ne '') {
    open(DEBUGIN, $debuginput) or die "Could not open $debuginput: $!";
    @mail = <DEBUGIN>;
    close(DEBUGIN);
} else {
    @mail = <STDIN>;
}

#$debugfile = "/tmp/demime-debug.".$$;

#open(DEB, ">$debugfile");
#print DEB @mail;
#close DEB;
#
#sub END {
#    unlink $debugfile if defined $debugfile;
#}

$mail_opened = 0;
$mail_listsize = 0;

$fromhead = "";

$rc = parse822(@mail, undef, 1);

# decode_base64(@mail);

# mail_print "\n","Thank you for using demime!","\n";

if($mail_opened) {
    my($x) = 0;
    my($xa) = 0;
    my($xq) = 0;
    my ($return_key) = -999;
    foreach $i (0..$mail_listsize) {
	no strict;
	if($::key_pipe == $i) {
	    close ("MAIL".($i>0?"$i":"")) or warn (($x = $!) ? "error closing pipe to \"$::key_pipe_string\": $!": "\"$::key_pipe_string\" ended with code $?");
	    $return_key = $?;
	} else {
	    close ("MAIL".($i>0?"$i":"")) or warn (($x = $!) ? "error closing pipe to sendmail: $!": "Sendmail ended with code $?");
	    use strict;
	}
	$xa = $x if $x != 0;	# If errno was set in any of the above
	$xq = $? if $? != 0;
    }
    # $xa = "$!";
    # print "\$? = $?, \$! = $xa/",$x+0,"\n";
    if ($return_key != -999) {	# The key pipe has priority...
	exit &EX_TEMPFAIL if $return_key&0xff; # child died from signal
	exit $return_key>>8;	# Faithfully copy its return code.
    }
    # in any other think failed, tell the MTA to requeue
    exit &EX_TEMPFAIL if $xq != 0 or $xa != 0;
}
# and in any othr case, use the return code from the parser.
exit $rc;

#subroutines start here....

sub openmail () {		# Uniform routine to open the pipe to sendmail,
				# or, alternatively, to open stdout.
    use strict;
    return if $main::mail_opened;
    $::key_pipe = -1;
    my($fromhead) = $main::fromhead;
    my($relayto);
    my(@relays) = split(/;/, $main::relayto);
    my $i = 0;
    $::MAJIC_PIPE_PREFIX_CHAR = quotemeta $::MAJIC_PIPE_PREFIX_CHAR;
    foreach $relayto (@relays) {
	$relayto =~ s/^$::MAJIC_PIPE_PREFIX_CHAR/\|/;
	if ($relayto ne '-' and $relayto !~ /^\>\&\=\d+$|^\|/) {
	    no strict;
	    open("MAIL".($i>0?"$i":""), "|-") || 
		# print "exec \"/usr/sbin/sendmail\", \"-bm\", \"-i\", \"-v\", '-f', $fromhead, $relayto\n";
		exec "/usr/sbin/sendmail", "-bm", "-i", '-f', $fromhead, $relayto;
	    use strict;
	} else {
	    no strict;
	    if($relayto eq '-') {
		open("MAIL".($i>0?"$i":""), ">&STDOUT") || die "Can't dup stdout to MAIL$i: $!";
	    } else {
		if($relayto =~ /^\>\&\=\d+$/) {
		    open("MAIL".($i>0?"$i":""), $relayto) || die "Can't dup stdout from $relayto to MAIL$i: $!";
		} else {
		    $relayto =~ /^(.*)$/;
		    if ($::key_pipe == -1) {
			open("MAIL".($i>0?"$i":""), $1) || die "Can't fork $relayto off of MAIL$i: $!";
			$::key_pipe = $i;
			$::key_pipe_string = $relayto;
		    } else {
			warn "You can have only one key pipe - opening but not resetting key.";
			open("MAIL".($i>0?"$i":""), $1) || die "Can't fork $relayto off of MAIL$i: $!";
		    }
		}
	    }
	    use strict;
	}
	$i++;
    }
    $main::mail_listsize = $i-1;
    $main::mail_opened = 1;
}

sub mail_print (@) {
    use strict;
    openmail unless $main::mail_opened;
    my $p;
    my $i;
    foreach $p (@_) {
	foreach $i (0..$main::mail_listsize) {
	    no strict;
	    print {"MAIL".($i>0?"$i":"")} $p;
	    use strict;
	}
    }
}
# The Evil package allows us to encapsulate and provide syntactic
# sugar around a very complex data structure and a set of complex
# rules involving pulling hunks out of files.  I don't expect to 
# reuse it, but the ability to not have to completely resolve the 
# triplets makes the main line code easier to read. 
package Evil;
#require Exporter;
#@ISA = qw(Exporter);
use strict;
$Evil::VERSION = 1.0;
#possible states - should be inlined.
sub About () {
    "Evil - a place to keep evil stuff - $Evil::VERSION";
}
sub UNMATCHED {0;}
sub PREFIX_MATCHED {1;}
sub CENTER_MATCHED {2;}
sub SUFFIX_MATCHED {3;}
sub FINAL_MATCHED {4;}
#@Evil::EXPORT = qw(UNMATCHED PREFIX_MATCHED CENTER_MATCHED SUFFIX_MATCHED FINAL_MATCHED);
sub run_regexp_list (\$\@\@);
sub new {
    my $this = shift;
    my $class = ref($this) || $this;
    my $self = { prefix => [],
		 psub => [],
		 center => [],
		 csub => [],
		 suffix => [],
		 ssub => [],
		 state => UNMATCHED,
		 hotpos => undef,
	     };
    bless $self, $class;
    return $self;
}
sub has_a_center {
    my $this = shift;
    return 1 if 0 < @{$this->{'center'}};
    return undef;
}
sub has_a_prefix {
    my $this = shift;
    return 1 if 0 < @{$this->{'prefix'}};
    return undef;
}
sub has_a_suffix {
    my $this = shift;
    return 1 if 0 < @{$this->{'suffix'}};
    return undef;
}
sub match_state {
    my $this = shift;
    my $oldstate = $this->{'state'};
    $this->{'state'} = shift if @_;
    return $oldstate;
}
sub match_position {
    my $this = shift;
    my $oldposition = $this->{'hotpos'};
    $this->{'hotpos'} = shift if @_;
    return $oldposition;
}
sub process_line {
    my $this = shift;
    unless(@_) {		# Empty line means reset state;
	$this->{'state'} = UNMATCHED;
	$this->{'hotpos'} = undef;
	return undef;
    }
    my $line = shift;
    if($this->{'state'} == UNMATCHED) {
	# If we are being asked to match an unmatched evil, we need to look
	# over prefixes to see if they match.
	if(run_regexp_list($line, @{$this->{'prefix'}},@{$this->{'psub'}})) {
	    $this->{'state'} = PREFIX_MATCHED;
	    return PREFIX_MATCHED;
	}
	return UNMATCHED;
    } 
    if ($this->{'state'} == PREFIX_MATCHED) {
	# If the prefix has matched, 
	if($this->has_a_center()) {
	    if(run_regexp_list($line, @{$this->{'center'}},@{$this->{'csub'}})) {
		$this->{'state'} = CENTER_MATCHED;
		return CENTER_MATCHED;
	    }
	    # For centered lists, a failure to match is not a problem,
	    # unless the suffix matches.
	    if(run_regexp_list($line, @{$this->{'suffix'}},@{$this->{'ssub'}})) {
		$this->{'state'} = UNMATCHED;
		return UNMATCHED;
	    }
	    # state unchanged.
	    return $this->{'state'};
	} elsif (not $this->has_a_suffix) {
	    # If no suffix, delete anything that matches prefix
	    if(run_regexp_list($line, @{$this->{'prefix'}},@{$this->{'psub'}})) {
		$this->{'state'} = SUFFIX_MATCHED;
		return SUFFIX_MATCHED;
	    }
	    # No match?  Shift directly to final to elide start to
	    # current_line -1 (with no center);
	    $this->{'state'} = FINAL_MATCHED;
	    return FINAL_MATCHED;
	} else {
	    if(run_regexp_list($line, @{$this->{'suffix'}},@{$this->{'ssub'}})) {
		$this->{'state'} = SUFFIX_MATCHED;
		return SUFFIX_MATCHED;
	    }
	    # If we had matched a prefix and were looking for a suffix,
	    # and we have not found even one, the prefix match was a bogey.
	    $this->{'state'} = UNMATCHED;
	    return UNMATCHED;
	}
    }
    if ($this->{'state'} == CENTER_MATCHED) {
	# If we have matched a center line, we are now looking for a
	# suffix line.  If we get it, we now want to return an indication
	# that we are ready to close.
	if(run_regexp_list($line, @{$this->{'suffix'}},@{$this->{'ssub'}})) {
	    $this->{'state'} = FINAL_MATCHED;
	    return FINAL_MATCHED;
	}
	# State unchanged.
	return $this->{'state'};
    }
    if ($this->{'state'} == SUFFIX_MATCHED) {
	if($this->has_a_suffix) {
	    if(run_regexp_list($line, @{$this->{'suffix'}},@{$this->{'ssub'}})) {
		return SUFFIX_MATCHED; # Still matched
	    }
	    return FINAL_MATCHED;	# One past 
	}  else {
	    if(run_regexp_list($line, @{$this->{'prefix'}},@{$this->{'psub'}})) {
		return SUFFIX_MATCHED; # Still matched
	    }
	    return FINAL_MATCHED;	# One past 
	}
    }
    die "State error in process_line.\n";
}
	
sub add_to_prefix {
    my $self = shift;
    push @{$self->{'prefix'}}, @_;
}
sub add_to_center {
    my $self = shift;
    push @{$self->{'center'}}, @_;
}
sub add_to_suffix {
    my $self = shift;
    push @{$self->{'suffix'}}, @_;
}
sub check_prefix {
    my $this = shift;
    unless (@_) {
	return undef;
    }
    my($line) = shift;
    return run_regexp_list($line, @{$this->{'prefix'}},@{$this->{'psub'}});
}
# A private subroutine in the Evil package.

sub run_regexp_list (\$\@\@) {
    my($l, $list,$pslst) = @_;
    my($e, $t);
    my($i);
    my(@r) = ();
    for($i = 0; $i < @$list; $i ++ ) {
	unless(defined $$pslst[$i]) {
	    $e = $$list[$i];
	    eval "\$pslst->[\$i] =
		    sub {
			my(\$l) = shift;
			\$\$l =~ /$e/;
		    };";
            if($@) {
	       warn $@;
               $$pslst[$i] = undef;
	       next;
	    }
        }
        if(defined $pslst->[$i]) {
	    $t = &{$pslst->[$i]}($l);
        } else {
	    print "Whoops! ";
	    $e = $$list[$i];
            print $e,"\n";
#            1 while $e =~ s <([^\\]|^)/> <$1\\/>;
	    $t = eval "\$\$l =~ /$e/";
	    if($@) {
	        warn $@;
	        next;
	    }
        }
	if($t) {
	    return 1;
	}
    }
    return undef;
}
1;
package main;
%main::evil = ();
$main::evil_suffix_expressions_filled = 0;
sub fill_suffix () {
    return if $main::evil_suffix_expressions_filled;
    if($::AD_REMOVE) {
	eval {
	    # my($_);
	    my($type, $tree);
	    open(JUNK, $::junkmail_file) || die "Can't open junkmail file:$!";
	    topjunk: while (<JUNK>) {
		next if /^\s*$|^\s*(\#|\;|\/\/..)/; # comment syntax
		chomp;
		unless (/^\s*\[(prefix_match|suffix_match|center_match)(_.[^\]]+)?\]\s*$/) {
		    warn "Bad format line in $::junkmail_file: $_\n";
		    next;
		}
		$type = $1;
		if(defined $2 and $2 ne '') {
		    $tree = $2;
		} else {
		    $tree = '_';
		}
		$main::evil{$tree} = Evil->new()
		    unless defined $main::evil{$tree};
		while (<JUNK>) {
		    next if /^\s*$|^\s(\#|\;|\/\/..)/;
		    chomp;
		    if(/^\s*\/(.*)\/\s*$/) {
			my($e) = $1;
			1 while $e =~ s <([^\\]|^)/> <$1\\/>;
			if($type eq 'prefix_match') {
			    $main::evil{$tree}->add_to_prefix($e);
			} elsif ($type eq 'suffix_match') {
			    $main::evil{$tree}->add_to_suffix($e);
			} elsif ($type eq 'center_match') {
			    $main::evil{$tree}->add_to_center($e);
			} else {
			    warn "regular expression ignored - not in section in $::junkmail_file: $_\n";
			}
		    } else {
			redo topjunk;
		    }
		}
	    }
	    close(JUNK);
	};
	warn $@ if($@);		# Why eval?  Eventually, this will go to 
				# syslog, probably through a switch and
				# the __WARN__ pseudo-signal.
    }
    $main::evil_suffix_expressions_filled = 1;
}

@main::mail_body_text = ();
sub mail_body_print (@) {
    push (@main::mail_body_text, @_);
}
sub is_blankline ($) {
    return 1 if ($_[0] =~ /^[\s>]*$/);
    return undef;
}
# The following regular expression broke perl.  Running
# it enough times allowed Perl to end up in a tight loop.
# if($q[$i] =~ /^((\s+>*\s*)|(\s*>+\s*)|(\s*>*\s+))*$/) {

sub clear_all_evil {
    use strict;
    my($ev);
    foreach $ev (keys %main::evil) {
	$main::evil{$ev}->process_line;
    }
}
sub mail_body_flush () {
    use strict;
    return if @main::mail_body_text == 0;
    openmail unless $main::mail_opened;
    my $p;my @q;
    $p = join('',@main::mail_body_text);
    @q = split(/\n/, $p);
    return if @q == 0;
    if($main::AD_REMOVE) {
	fill_suffix;
	# BEGIN { Evil->import;};
	my($i, $e, $ev);
	my($t);
	my($at_beginning) = 1;	# Delete blank lines at beginning, if any.
	my $blankline;
	my $last_nonblank_line = $[;
	my(@in_prefix_match) = (); # list of evil keys... 
	my(@in_center_match) = (); # List of evil keys with 
				   # prefix-center-suffix - they take
				   # precedence over simple matches.
	my(@new_match_list);	# The ones that matched this cycle
	my(@kill_line_pairs) = (); 
	# loop_state = 0 - no matches current --- UNMATCHED
	#              1 - non-center matchs current --- PREFIX_MATCHED
	#              2 - center matches current. CENTER_MATCHED
	my $loop_state;
	my(@potential_kill_line_pairs);
	@potential_kill_line_pairs = ();

next_i: foreach $i ($[ .. $#q) {
	    #print "line $i: $q[$i]\n";
	    #if($q[$i] =~ /\Q_______________________________\E/i) {
	    #	print "juno break.\n";
	    #}
	    # 1.  Delete blank lines at beginning.
	    # 2.  Never match against a blank line.
	    # 3.  Blank lines preceedng an elided section will be elided.
	    # 4.  Blank lines at the end will be elided.
	    if(is_blankline($q[$i])) { 
		if ($at_beginning) {
		    unless(defined $kill_line_pairs[0]) {
			$kill_line_pairs[0] = [$[, $i];
		    } less {
			$kill_line_pairs[0]->[1] = $i;
		    }
		    next;
		}
		$blankline = 1;
		next;
	    }
	    $blankline = 0;
	    $at_beginning = 0 if $at_beginning;

# @Evil::EXPORT = qw(UNMATCHED PREFIX_MATCHED 
	    # CENTER_MATCHED SUFFIX_MATCHED FINAL_MATCHED);
	    $loop_state = @in_center_match?2:@in_prefix_match?1:0;
	    @new_match_list = ();
	    
           foreach $ev ((@in_center_match?@in_center_match:()),
                        (@in_prefix_match?@in_prefix_match:()),
                        ((@in_center_match == 0 and @in_prefix_match == 0)?
                        keys %main::evil:())) {
		$t = $main::evil{$ev}->process_line($q[$i]);
		next if not defined $t or $t == Evil::UNMATCHED;
		if($t == Evil::PREFIX_MATCHED) {
		    if($loop_state == 2) {
			push @new_match_list, $ev; # Still a candidate.
		    } elsif ($loop_state == 1) {
			# This is essentially a PREFIX_MATCH followed by a
			# PREFIX_MATCH.  We save the state, and leave the 
			# old location.  But we still need a FINAL_MATCHED.
			push @new_match_list, $ev;
		    } elsif ($loop_state == 0) {
			# This is where the brand new match list gets built.
			# this can only happen when the suffix match lists 
			# are the same, so theoretically all of the 
			# $ev->match_position values should be the same.
			$main::evil{$ev}->
			    match_position($last_nonblank_line+1);
			if($main::evil{$ev}->has_a_center) {
			    push @in_center_match, $ev;
			} else {
			    push @in_prefix_match, $ev;
			}
		    }
		} elsif ($t == Evil::CENTER_MATCHED) {
		    if($loop_state == 2) {
			push @new_match_list, $ev;
		    } else {
			warn "$t (center matched) when loop state $loop_state (must be 2).\n";
			clear_all_evil;
			@in_prefix_match = ();
			@in_center_match = ();
			@new_match_list = ();
			@potential_kill_line_pairs = ();
			if($loop_state != 0) {
			    redo next_i;
			} else {
			    next next_i;
			}
		    }
		} elsif ($t == Evil::SUFFIX_MATCHED) {
		    if($loop_state == 1 or $loop_state == 2) {
			push @new_match_list, $ev;
		    } else {
			warn "Funky state - got $t with state $loop_state";
			next;
		    }
		} elsif ($t == Evil::FINAL_MATCHED) {
		    if($loop_state == 2) {
			# We elide the *first* center match we see.
			push @kill_line_pairs, 
			[ $main::evil{$ev}->match_position, $i ];
			clear_all_evil;
			@in_prefix_match = ();
			@in_center_match = ();
			@new_match_list = ();
			next next_i;
		    } elsif ($loop_state == 1) {
			# We elide the *last* simple prefix match we see.
			push @potential_kill_line_pairs, 
			[ $main::evil{$ev}->match_position, $i-1 ];
			next;
		    } else {
			warn "loop state $loop_state but got $t (FINAL_MATCHED) - ignoring match, resetting.\n";
		    }
		    clear_all_evil;
		    @in_prefix_match = ();
		    @in_center_match = ();
		    @new_match_list = ();
		    @potential_kill_line_pairs = ();
		    if($loop_state == 1) {
			redo next_i;
		    } else {
			next next_i;
		    }
		} else {
		    warn "Unknown value for t - $t.\n";
		}
	    }			# Matches the main trip through evil.
		
	    if($loop_state == 2) {
		# Special termination circumstance - to avoid runaway
		# center matches.  If any non-center-match prefix matches
		# any line that is in the middle of a center match,
		# We give up.
		# We can do this because terminations for centers with
		# FINAL_MATCHED are processed above.
		foreach $ev (keys %main::evil) {
		    next if $main::evil{$ev}->has_a_center;
		    if($main::evil{$ev}->check_prefix($q[$i])) {
			clear_all_evil;
			@in_prefix_match = ();
			@in_center_match = ();
			@new_match_list = ();
			@potential_kill_line_pairs = ();
			# Recycle the current line.
			# never do a redo if the match state is zero.
			redo next_i;
		    }
		}
	    }
	    if(@new_match_list > 0) {
		if($loop_state == 1) {
		    @in_prefix_match = @new_match_list;
		} elsif ($loop_state == 2) {
		    @in_center_match = @new_match_list;
		} else {
		    warn "new_match_list has @new_match_list, but loop state is $loop_state, killing all matches.";
		    clear_all_evil;
		    @in_prefix_match = ();
		    @in_center_match = ();
		    @new_match_list = ();
		}
	    } elsif($loop_state > 0) {
		# We have nothing in the @new_match_list
		# if we have had any @potential_kill_line_pairs, we now
		# build a @kill_line_pair based on that.
		if(@potential_kill_line_pairs) {
		    @potential_kill_line_pairs =
 			sort { $$a[0] <=> $$b[0] or $$a[1] <=> $$b[1] }
			    @potential_kill_line_pairs;
		    push @kill_line_pairs, 
		    [ $potential_kill_line_pairs[$[]->[0],
		      $potential_kill_line_pairs[$#potential_kill_line_pairs]->[1] ];
		}
		# all matches went away, clear all state.
		clear_all_evil;
		@in_prefix_match = ();
		@in_center_match = ();
		@new_match_list = ();
		@potential_kill_line_pairs = ();
		redo next_i;
	    }
	} continue {
	    $last_nonblank_line = $i unless $blankline;
	}
	if (@in_prefix_match > 0) {
	    foreach $ev (@in_prefix_match) {
		if($main::evil{$ev}->match_state == Evil::SUFFIX_MATCHED) {
		    push @kill_line_pairs, 
		    [ $main::evil{$ev}->match_position, $#q ];
		    $blankline = 0;
		    @potential_kill_line_pairs = ();
		    last;
		}
	    }
	} 
	if(@potential_kill_line_pairs) {
	    @potential_kill_line_pairs =
		sort { $a->[0] <=> $b->[0] or $a->[1] <=> $b->[1] } 
		    @potential_kill_line_pairs;
	    push @kill_line_pairs, 
	    [ $potential_kill_line_pairs[$[]->[0],
	      $potential_kill_line_pairs[$#potential_kill_line_pairs]->[1] ];
	    $blankline = 0;
	}
	
	if($blankline and $last_nonblank_line < $#q) {
	    push @kill_line_pairs, [ $last_nonblank_line+1, $#q ];
	}
	# Elide the array here based on kill_line_pairs.
	while ($ev = pop @kill_line_pairs) {
	    ($i, $e) = @$ev;
	    splice(@q, $i, ($e - $i) + 1);
	}
    }
    foreach $p (@q) {
	($p =~ tr [\200-\377] [\000-\177]) if $main::SEVEN_BIT_ONLY ;
	$p =~ s/\000//g;
	mail_print ($p,"\n");
    }
    @main::mail_body_text = ();
}
sub END {
    mail_body_flush;
    # $SIG{"__DIE__"};
}
# much faster than the commented out version below.

sub decode_base64 (\@) {
    use strict;
    my $decode = shift;
    my $dstr = join("",@$decode);
    my $i;
    my $ll;
    my $out = "";
    # First remove all non base64 characters
    $dstr =~ tr {A-Za-z0-9+/=}{}cd;
    if(length($dstr) % 4 or length($dstr) == 0) {
	mail_print "base64 encoded Mime section invalid - length (",length($dstr),") was wrong.\n";
	return undef;
    }
    $dstr =~ s/={1,3}$//;	# Delete trailing pad characters
    if(($i = index($dstr, "=")) != ($[ - 1)) {
	mail_print "base64 encoded Mime section invalid - extra = in body at character $i.\n";
	return undef;
    }
    # Translate from base64 coding alphabet to
    # uuencode alphabet
    $dstr =~ tr [A-Za-z0-9+/] [ -_]; # This line is ascii dependent
    # Break into groups of 60 characters -
    # apply a length byte to the front of each group.
    # pass to unpack to decode, line by line.
    for($i = 0; $i < length($dstr); $i += 60) {
	$ll = substr($dstr, $i, 60);
	$out .= unpack('u', chr(32 + length($ll)*3/4).$ll);
    }
    # Now break into lines and convert the canonical form crlf
    # into the local form lf
    my @plug = ();
    my $lagi = $[;
    while($lagi >= $[) {
	$i = index("\r\n", $out, $lagi);
	if($i < $[) {
	    push(@plug,substr($out, $lagi));
	    $out = "";
	} else {
	    $i += 2;
	    $ll = substr($out, $lagi, ($i+2)-$lagi);
	    $ll =~ s/\r\n/\n/;
	    push @plug, $ll;
	}
	$lagi = $i;
    }
    return \@plug;
}

#sub decode_base64 (\@) {
#    # Given a set of lines that is coded in base64, 
#    # return a reference to a array of lines which contains the translated thing.
#    use strict;
#    my $out = "";
#    my %base64 = ('A' => 0, 'R' => 17, 'i' => 34, 'z' => 51,
#		  'B' => 1, 'S' => 18, 'j' => 35, '0' => 52, 
#		  'C' => 2, 'T' => 19, 'k' => 36, '1' => 53, 
#		  'D' => 3, 'U' => 20, 'l' => 37, '2' => 54, 
#		  'E' => 4, 'V' => 21, 'm' => 38, '3' => 55, 
#		  'F' => 5, 'W' => 22, 'n' => 39, '4' => 56, 
#		  'G' => 6, 'X' => 23, 'o' => 40, '5' => 57, 
#		  'H' => 7, 'Y' => 24, 'p' => 41, '6' => 58, 
#		  'I' => 8, 'Z' => 25, 'q' => 42, '7' => 59, 
#		  'J' => 9, 'a' => 26, 'r' => 43, '8' => 60, 
#		  'K' => 10, 'b' => 27, 's' => 44, '9' => 61, 
#		  'L' => 11, 'c' => 28, 't' => 45, '+' => 62,
#		  'M' => 12, 'd' => 29, 'u' => 46, '/' => 63,
#		  'N' => 13, 'e' => 30, 'v' => 47, 
#		  'O' => 14, 'f' => 31, 'w' => 48, 
#		  'P' => 15, 'g' => 32, 'x' => 49, 
#		  'Q' => 16, 'h' => 33, 'y' => 50,
#		  '=' => -1);
#    my $dec = shift;
#    my $myline;
#    my @line;
#    my @plug;
#    my $pp = 0;
#    my $ppout;
#    my $i;
#    # print "last line is ",$dec->[$#{$dec}];
#    decode_base64_line: foreach $myline (@$dec) {
#	@line = split(//,$myline);
#	for($i = 0; $i < @line; $i++) { # char by char
#	    next unless defined $base64{$line[$i]};
#	    if($base64{$line[$i]} == -1) {
#		#closure 
#		if ($pp == 1) {
#		    warn "One character in stack at = - illegal";
#		    $out .= pack('NXXX', ($plug[0]<<26));
#		} elsif ($pp == 2) {
#		    # print "ended with 2 equals\n";
#		    $out .= pack('NXXX', ($plug[0]<<26)+($plug[1]<<20));
#		} elsif ($pp == 3) {
#		    # print "ended with 1 equal\n";
#		    $out .= pack('NXX', ($plug[0]<<26)+($plug[1]<<20)+($plug[2]<<14));
#		}
#		last decode_base64_line;
#	    }
#	    $plug[$pp++] = $base64{$line[$i]};
#	    next if($pp < 4);
#
#	    $out .= pack('NX', ($plug[0]<<26)+($plug[1]<<20)+($plug[2]<<14)+($plug[3]<<8));
#	    
#	    $pp = 0;
#	}
#    }
#    # print $out;
#    @plug = ();
#    while(length($out) > 0) {
#	$i = index("\r\n", $out);
#	if($i < $[) {
#	    push(@plug,$out);
#	    $out = "";
#	} else {
#	    $myline = substr($out, $[, $i+2);
#	    substr($out, $[, $i+2) = "";
#	    $myline =~ s/\r\n/\n/;
#	    push @plug, $myline;
#	}
#    }
#    return \@plug;
#}

sub unquote_line(\$) {
    use strict;
    my $lineref = shift;
#    while ($$lineref =~ /(.*?)=([0-9A-Fa-f]{2})(.*)/s) {
#	$$lineref = $1.chr(eval('0x'.$2)).$3;
#    }
    return unless defined $$lineref;    
    $$lineref =~ s/=([0-9A-Fa-f]{2})/chr(eval('0x'.$1))/egs;
    no strict;
}
sub decode_quoted_printable (\@) {
    use strict;
    my $dec = shift;
    my @out = ();
    # linepush(0, $out, $word);
    my $line;
    my $lagline = "";
    my $dolag = 0;
    my $i;
    foreach $line (@$dec) {
	chomp $line;
	if($dolag) {
	    $line = $lagline . $line;
	    $dolag = 0;
	    $lagline = "";
	}
	if ($line =~ /(.*?)=\s*$/) { # Soft crlf processing...
				     # Also deletes trailing spaces.
	    $lagline = $1;
	    $dolag = 1;
	    next;
	}
	$line =~ s/\s+$//g;	# Trailing space deletion required here.
	# $line =~ s/[\n\r]//g;	# Take out all "extra" newlines.
	unquote_line($line);
	pos($line) = 0;
	# Segment 1 of the regex matches the *Shortest* line it can,
	# when this is the end of the line.  Trailing space is eliminated,
	# Because the ? makes the pattern non-greedy, so that the space,
	# if any, can match outside of the pattern.
	# Segment 2 of the regex matches the longest line segment it
	# can where there is a nonspace followed by some space.  This
	# is used to re-wrap the line at a natural division.
	# Segment 3 matches at least 1 and at most 77 characters.
	# We should only get to this if there is a long line with no
	# spaces and segments 1 and 2 don't match.
	if($line =~ /^\s*$/) {	# Completely blank line requires special
				# processing.  
	    push(@out, "\n");
	} else {
	    while ($line =~ /\G ( .{1,77}? ) \s* $ | 
		             \G ( .{0,77}\S ) \s+ |
		             \G ( .{1,77} ) /sgx) {
		if(defined $1) {
		    push(@out, $1."\n");
		    last;
		} elsif (defined $2) {
		    push(@out, $2."\n");
		} else {
		    if(defined $3 and $3 ne '') {
			push(@out, $3,"\n");
		    } else {
			push(@out, "\n");
		    }
		}
	    }
	}
    }
    if($dolag) {
	unquote_line($line);
	pos($line) = 0 if defined $line;
	if((not defined $line) || $line =~ /^\s*$/) {
	    push(@out, "\n");
	} else {
	    while ($line =~ /\G ( .{1,77}? ) \s* $ | 
		             \G ( .{0,77}\S ) \s+ |
		             \G ( .{1,77} ) /sgx) {
		if(defined $1) {
		    push(@out, $1."\n");
		    last;
		} elsif (defined $2) {
		    push(@out, $2."\n");
		} else {
		    if(defined $3 and $3 ne '') {
			push(@out, $3,"\n");
		    } else {
			push(@out, "\n");
		    }
		}
	    }
	}
    }
    return \@out;
}

sub parsehead (\@\$\$\%\@\%\@\$) { # Parse header producing keyed list of headers and other ### tneff
				# indexes to headers.  Also folds lines to single line.
				# Used on main header and section headers in mime sections.
    use strict;
    # die "Wrong number of args to parsehead." if (@_ != 8);	### tneff
    my ($mail, $endhead, $fromhead, $headtypes, $headarr, $head, $headkey, $envfrom) = @_;	### tneff
    my $line;
    my $l;
    my $lag = "";
    my $i;
    foreach $line (@$mail) {
	$$endhead ++;
	if ($line =~ /^$/) {
	    next if $lag eq "";	# Might be a blank first line
	    last;
	}
	if($line =~ /^([^\s:]+):\s+(.*)$/) {
	    $l = lc $1;
	    $headtypes->{$l} = $l;
	    $i = 0;
	    if(defined $head->{$l,0}) {
		# Stack these puppies up
		$i++;
		while(defined $head->{$l,$i}) { $i++ ;}
	    }
	    push(@{$headkey},$l,$i, $1);
	    $lag = $l;
	    $head->{$l, $i} = $2;
	    push(@{$headarr}, $1, $2);
	} elsif ($line =~ /^\s+(.*)$/) {
	    $head->{$lag, $i} .= (" ".$1);
	    # The following test makes the program tolerant of a totally
	    # malformed fiirst header line.   Blech.
	    $headarr->[$#{$headarr}>= $[?$#{$headarr}:$[] = $head->{$lag, $i}; # Replace last array element with continuation
	} elsif ($line=~ /^from\s([^ ]*)/i) {
	    $$fromhead = $1;
	    $$envfrom = $line;
	}
    }
    while (defined $mail->[$$endhead] and $mail->[$$endhead] =~ /^$/) {
	$$endhead ++;
    } # Skip blank lines.....
    no strict;
}

sub delhead ($$\@) {			# Headkey is used to print headers,
				# either debugging or on working output.
				# Remove element from headkey so that
				# header will not print, effectively
				# deleting it.
    use strict;
    # die "Wrong number of args to delhead." if (@_ != 3);
    my ($head, $pos, $headkey)  = @_;
    my $i;
    for($i = $[; $i < @$headkey; $i += 3) {
	next unless defined $headkey->[$i] and $headkey->[$i] eq $head;
	if($pos == -1) {
	    splice(@$headkey, $i, 3);
	    redo;
	}
	next unless $pos == $headkey->[$i+1];
	splice(@$headkey, $i, 3);
	return;
    }
    no strict;
}

sub headout (\@\%$$) {		# Headout prints a structured, reformatted header 	### tneff
    use strict;
    my ($headkey, $head, $deferred_message, $envfrom) = @_;	### tneff
    my $line;
    my $tline;
    my @line;
    my ($i, $j, $k, $hkl);
    mail_print ($envfrom) if $envfrom and $::PRESERVE_UNIX_FROM_LINE; ### tneff/njs
    for($i = 0; $i < @$headkey; $i += 3) {
	# print "$i $headkey->[$i+2]: $headkey->[$i+1]\n";
	$j = 0;
	$line = $head->{$headkey->[$i],$headkey->[$i+1]};
	while (length($line) > 0) {
	    $hkl = $j > 0?2:length($headkey->[$i+2])+2;
	    if ($hkl + length($line) > 72) {
		for($k = 72 -($hkl); $k > 0 and not (substr($line,$k,1) =~ /^\s$/); $k--) {}
		if($k <= 0) {
		    # We must break on a space - or not break
		    for($k = 72 -($hkl); $k < length($line) and not (substr($line,$k,1) =~ /^\s$/); $k++) {}
		    if($k < length($line)) {
			$tline = substr($line, $[, $k);
			$line = substr($line, $k+1);
		    } else {
			$tline = substr($line, $[, $k);
			$line = $k < length($line)?substr($line, $k+1):'';
		    }
		    #$tline = substr($line, $[, 72-$hkl);
		    #$line = substr($line, 72-$hkl);
		} else {
		    $tline = substr($line, $[, $k);
		    $line = substr($line, $k+1);
		}
	    } else {
		$tline = $line;
		$line = "";
	    }
	    mail_print (($j==0?"$headkey->[$i+2]: ":"  "),$tline,"\n");
	    $j++;
	}
    }
    if(defined $deferred_message and $deferred_message ne "") {
	mail_print $deferred_message;
    }
    no strict;
}

sub textout ($$) {
    # The nefarious attachers (microsoft, perhaps) will sometimes attach a 
    # uuencoded section without a separator.  The point here is to remove
    # all steenking uuencoded attachments.
    # We look for begin lines and remove anything between a begin and an end,
    # including the begin and end lines.
    # If we get a false begin line match (a begin with no end) we recover by
    # printing every line between the false match and the end.  (If a mail
    # were to be cut off partway through an attachment, we would restore it.
    # If that becomes a problem, we will do momething else.
    # This is where advertising suffixes are chopped as well.

use strict;
    my $bodyref = shift;
    my $encoding = shift;
    my $line;			# What's \1?
    my $uuencode = 0;
    my $delete_leading_blank = 1;
    my $jc;
    my $filename = "";
    my $startwhich;
    my $linecount;

if (defined $encoding) {
	if ("quoted-printable" eq lc $encoding) {
	    $bodyref = decode_quoted_printable(@$bodyref);
	} elsif ("base64" eq lc $encoding) {
	    $bodyref = decode_base64(@$bodyref);
	} elsif ($encoding !~ /7bit|8bit|binary/i) {
	    mail_print "[demime could not interpret encoding $encoding - treating as plain text]\n";
	}
    }
 
    my $whichline = $[ - 1;
    line: foreach $line (@$bodyref) {
	$whichline ++;
	if($uuencode>0) {
	    if($uuencode == 1) {
		$linecount ++;
		next unless $line =~ /^end$/i;
		$uuencode = 2;
	    } elsif ($uuencode == 2) {
		unless (defined $main::nowarn) {
		    mail_body_print "[demime removed a uuencoded section named $filename which was $linecount lines]\n";
		}
		$uuencode = 0;
		(mail_body_print $line) unless $line =~ /^$/;
	    }
	} else {
	    if($line =~ /^begin\s+[0-7]{1,3}\s+(\S+)/i) {
		$filename = $1;
		$linecount = 0;
		$uuencode = 1;
		$startwhich = $whichline;
		next line;
	    } 
	    if($delete_leading_blank) {
		if ($line !~ /^\s*$/) {
		    mail_body_print $line;
		    $delete_leading_blank = 0;
		}
	    } else {
		mail_body_print $line;
	    }
	    
	}
    }
    if($uuencode == 1) {	# False indication - the begin line
				# had no end - recover by printing elided section.
	my $i;
	foreach $i ($startwhich..$#{$bodyref}) {
	    mail_body_print $bodyref->[$i];
	}
    } elsif($uuencode == 2) {	# The last line was the 'end'
	unless (defined $main::nowarn) {
	    mail_body_print "[demime removed a uuencoded section named $filename which was $linecount lines]\n";
	}
    }
    mail_body_flush;
    no strict;
}

sub linepush ($\$$) {		# This routine is used by the rich
				# text formatter to put a token into
				# the output stream.  $excerptcount controls
				# the indentation level.
    use strict;
    my ($excerptcount, $bodyout, $word) = @_;
    if($$bodyout eq "") {
	# Start new line
	if ($excerptcount > 0) {
	    $$bodyout = (">" x $excerptcount)." ";
	}
    }
    if($word eq "\n") {
	mail_body_print ($$bodyout, "\n");
	$$bodyout = "";
	return;
    }
    if((length($$bodyout) + length($word)) > 72) {
	mail_body_print ($$bodyout,"\n");
	if($word ne " ") {
	    if ($excerptcount > 0) {
		$$bodyout = (">" x $excerptcount)." ";
	    } else {
		$$bodyout = "";
	    }
	    
	} else {
	    $$bodyout = "";
	    return;
	}
    }
    $$bodyout .= $word;
}

sub adj_msgid () {			# The program always mungs the message-id
				# to indcate when reprocessed.
    return unless defined $::head{'message-id',0};

my $msgid = $::head{'message-id',0};
    my $time = time;
    $msgid =~ s/\@/.$time.$$\@/;
    $::head{'message-id',0} = $msgid;
}

sub richout ($$) {		# This routine actually does the
				# parsing of the rich text section.
    use strict;
    my $bodyref = shift;
    my $encoding = shift;
    #Richtext conformance:  A minimal richtext implementation  is
    #one  that  simply  converts "<lt>" to "<", converts CRLFs to
    #SPACE, converts <nl> to a newline according to local newline
    #convention,  removes  everything between a <comment> command
    #and the next balancing </comment> command, and  removes  all
    #other  formatting  commands  (all  text  enclosed  in  angle
    #brackets).
    # We will also treat <PARAM> like comments, and count and 
    # stack/unstack excerpt.  We are unsure whether we should also
    # convert << to <, but we are doing it.
    # print @$bodyref;
    if (defined $encoding) {
	if ("quoted-printable" eq lc $encoding) {
	    $bodyref = decode_quoted_printable(@$bodyref);
	} elsif ("base64" eq lc $encoding) {
	    $bodyref = decode_base64(@$bodyref);
	} elsif ($encoding !~ /7bit|8bit|binary/i) {
	    mail_print "[demime could not interpret encoding $encoding - treating as plain text]\n";
	}
    }
    chomp @$bodyref;
    my $body = ""; my $bodylag = "\n";
    my $i;
    for($i = 0; $i < @$bodyref; $i ++) {
	$bodyref->[$i] = "\n" if $bodyref->[$i] eq "";
	if($bodylag eq "\n") {
	    $body .= $bodyref->[$i];
	} else {
	    $body .= (' '.$bodyref->[$i]);
	}
	$bodylag = $bodyref->[$i];
    }
    $body =~ s/<comment>.*?<\/comment>//ig;
    $body =~ s/<param>.*?<\/param>//ig;
    $body =~ s/<</<lt>/ig;	# Turn << escape for < to <lt>
    my $excerptcount = 0;
    my $bodyout = "";
    my @words = split(/( +)|(\n)|(<\/?[-a-z0-9]{1,40}>)/i,$body);
    my $word;
    foreach $word (@words) {
	next if (not defined $word) or $word eq ""; # Skip the nulls that this produces for some reason.
	if($word =~ /^<(\/?)([-a-z0-9]{1,40})>$/) {
	    my $negation = $1;
	    my $command = lc $2;
	    if($command eq "lt") {
		linepush($excerptcount, $bodyout, "<");
	    } elsif($command eq "nl") {
		linepush($excerptcount, $bodyout, "\n");
	    } elsif($command eq "np") {
		linepush($excerptcount, $bodyout, "\n");
		linepush($excerptcount, $bodyout, "\n");
	    } elsif ($command eq "excerpt") {
		linepush($excerptcount, $bodyout, "\n") if length($bodyout) > 0;
		if($negation eq "/") {
		    $excerptcount = $excerptcount>=1?$excerptcount-1:0;
		} else {
		    $excerptcount++;
		}
	    } else {
		# just ignore the command - for now.
	    }
	} else {
	    linepush($excerptcount, $bodyout, $word);
	}
    }
    if(length($bodyout) > 0) {
	linepush($excerptcount, $bodyout, "\n");
    }
    mail_body_flush;
    no strict;
}

sub mimesplit ($\@\@) {			# Given a delimiter, a body to split,
				# and an anchor (ref to array) this
				# routine will split up the mime into
				# head and body and so forth.
    use strict;
    my ($delim, $bodyref, $sections) = @_;
    my $sectnum = 0;
    my $linepos = 0;
    # skip through the body looking for a delimiter - up to the first one is the preamble.
    for(;$linepos < @$bodyref; $linepos++) {
	if ($bodyref->[$linepos] =~ /^--\Q$delim\E((--)?)$/) {
	    # print $linepos," ",$1," ", $bodyref->[$linepos];
	    push(@{${$sections}[$#{$sections}]}, $linepos-1) if @{$sections} > 0;
	    
	    last if defined $1 and $1 eq "--";	# No parts - got terminator as first section delimiter.
	    push (@$sections, [++$linepos]);
	}
    }
    # Now we need to extract a content-type subhead if any and other stuff - we want to 
    # split the mail into pieces nicely.
    my $subslice = 0;
    my $subref;
    foreach $subref (@$sections) {
	my $origlinepos = $subref->[0];
	for($linepos = $origlinepos; $linepos <= $subref->[1]; $linepos++) {
	    if($bodyref->[$linepos] =~ /^content-type:\s+([^;\n \t]+)\s*(;(.*))?$/i) {
		($subref->[2] = lc $1) unless defined $subref->[2];
		# (print "Extra content type $2\n") if defined $2 ;
	    } elsif($bodyref->[$linepos] =~ /^$/) {
		($subref->[2] = "text/plain") unless defined $subref->[2];
		$subref->[0] = $linepos + 1;
		$subref->[1]-- if $subref->[2] ne "text/plain";
		$subref->[3] = [@$bodyref[$subref->[0]..$subref->[1]]];
		$subref->[4] = [@$bodyref[$origlinepos..($linepos-1)]];	# Section headers
		last;
	    }
	}
    }
    no strict;
}

sub mimesplitprint (\@) {	# For debugging, this routine will
				# walk the structure produced by
				# mimesplit and print some basic info.
    use strict;
    my $sections = shift;
    my $i;
    for($i = 0; $i < @$sections; $i ++) {
	print "minline = ",${$sections}[$i]->[0]," maxline = ",${$sections}[$i]->[1],
	" content-type ",${$sections}[$i]->[2],"\n";
	print "intheaders:\n";
	print @{${$sections}[$i]->[4]};
    }
    no strict;
}

sub htmlout ($$) {		# This is the routine that parses and
				# prints the HTML sections.
    use strict;
    my $bodyref = shift;
    my $encoding = shift;
    if (defined $encoding) {
	if ("quoted-printable" eq lc $encoding) {
	    $bodyref = decode_quoted_printable(@$bodyref);
	} elsif ("base64" eq lc $encoding) {
	    $bodyref = decode_base64(@$bodyref);
	} elsif ($encoding !~ /7bit|8bit|binary/i) {
	    mail_print "[demime could not interpret encoding $encoding - treating as plain text]\n";
	}
    }
    if($::uselynx) {
	my ($body) = ""; 
	eval {			# Catchall for potential errors in LYNX...
	    use IPC::Open3;
	    my($mypid, $oldselect);
	    $mypid = open3(\*Tolynx, \*Fromlynx, '', "lynx --stdin --dump --force_html --hiddenlinks=ignore --localhost --image_links --nolist --noredir --noreferer --realm");
	    $oldselect = select(Tolynx); $| = 1; select($oldselect); 
	    my ($bodyindex) =  0 ;
	    my($rin, $win, $ein, $wout, $rout, $eout, $nfound, $timeout, $syserr);
	    $rin = $win = $ein = '';
	    vec($rin, fileno(Fromlynx), 1) = 1;
	    vec($win, fileno(Tolynx), 1) = 1;
	    $ein = $rin | $win;
	    $timeout = 60; # anything over a minute has got to be a bug.
	    while (1) {
		$nfound = select($rout=$rin, 
				 defined $win?$wout=$win:undef, 
				 defined $win?$eout = $ein:$eout = $rin, 
				 $timeout);
		if($nfound < 0) {
		    die "demime: Select failed: $!.\n";
		}
		if($nfound == 0) {
		    # this must be a timeout
		    die "$timeout second timeout in lynx, aborting.\n";
		}
		if(vec($rout, fileno(Fromlynx),1)) { # time to read
		    $syserr = sysread(Fromlynx, $body, 4096, length($body));
		    unless(defined $syserr) {
			die "demime: sysread from lynx failed: $!\n";
		    }
		    if (defined $syserr and $syserr == 0) {
			last;	# eof
		    }
		    next unless --$nfound;
		}
		if(vec($wout,fileno(Tolynx),1)) {
		    if($bodyindex < @$bodyref) {
			unless(print Tolynx $bodyref->[$bodyindex++]) {
			    die "demime: print to lynx failed: $!\n";
			}
		    } else {
			close(Tolynx);
			undef $wout;
			undef $win;
		    }
		    next unless --$nfound;
		}
		if(vec($eout, fileno(Fromlynx),1)) {
		    die "demime: select, Exception in file fromlynx.\n";
		    next unless --$nfound;
		} 
		if(vec($eout, fileno(Tolynx),1)) {
		    die "demime: select, Exception in file tolynx.\n";
		    next unless --$nfound;
		} 
		my($msg) = sprintf("rout - %x, wout - %x, eout - %x %d, %d, %d", 
				   $rout, $wout, 
				   $eout, fileno(Fromlynx), 
				   fileno(Tolynx), $nfound);
		die "demime: select, unknown problem ($msg).\n";
	    }
	    waitpid($mypid,0);
	};
	if($@) {
	    if(! $::RETURN_ERRORS_TO_ORIGIN) {
		mail_body_print "\n\nLynx formatting failed - html section has not been copied to output:\n $@";
		mail_body_flush;
		return &EX_OK;
	    } else {
		print STDERR "450 Lynx formatting failed: $@";
		return &EX_TEMPFAIL;
	    }
	}
	1 while $body =~ s (\n\s*\n\s*\n) (\n\n)g;
	mail_body_print $body;
	mail_body_flush;
	no strict;
    } else {
	no strict;
	require HTML::TreeBuilder;
	use strict;

my $p = HTML::TreeBuilder->new;
	my $body;
	foreach $body (@$bodyref) {
	    # print "-",$body;
	    $p->parse($body);
	}
	$p->eof;
	my $formatter = new HTML::myFormatText;
	$body = $formatter->format($p);
	1 while $body =~ s (\n\s*\n\s*\n) (\n\n)g;
	mail_body_print $body;
	mail_body_flush;
	no strict;
    }
}

sub parse_alternative_body (\@\$\$\@) {	# Used when parsing multipart/alternative
				        # to determine which section to print.
    use strict;
    my($sections, $winsect, $winval, $routine)  = @_;
    my $i;
    my $s;
    @$routine = (\&main::textout, \&main::htmlout, \&main::richout);
    my %selval = ("text/plain" => 0 , "text/html" => 1, "text/enriched" => 2,
		  "text/rich" => 2, "message/delivery-status" => 0);
    for($i = 0; $i < @$sections; $i ++) {
	$s = lc ($ {$sections}[$i]->[2]);
        if(defined $selval{$s}) {
	    if($selval{$s} < $$winval) {
		$$winsect = $i;
		$$winval = $selval{$s};
	    }
	}
    }
    no strict;
}

sub altout ($$$$) {		# Used by multipart/mixed when
				# it wants to output a multipart/alternative
				# subsection.
    use strict;
    my $body = shift;
    my $encoding = shift;
    if (defined $encoding) {
	if ("quoted-printable" eq lc $encoding) {
	    $body = decode_quoted_printable(@$body);
	} elsif ("base64" eq lc $encoding) {
	    $body = decode_base64(@$body);
	} elsif ($encoding !~ /7bit|8bit|binary/i) {
	    mail_print "[demime could not interpret encoding $encoding - treating as plain text]\n";
	}
    }
    my $recurdepth = shift;
    my $inhead = shift;
    my @routine = ();
    my $endhead; my $fromhead; my %headtypes; my @headarr; my %head; my @headkey; my @head; my $envfrom;	### tneff
    parsehead(@$inhead, $endhead, $fromhead, %headtypes, @head, %head, @headkey, $envfrom);
    if(defined $head{'content-type', 0} and $head{'content-type',0} =~ /^\s*multipart\/alternative\s*;.*?(boundary)=(?:(")([^"]*?)(")|([^;]+)(?:[;]|$))/i) { # nothing #
	
	# print "Quote = $2, delimiter = $3, Quote = $4, 5 = $5, 6 = $6, 7 = $7\n";
        my $delim;     
        if (defined $3) {
           $delim = $3;
        } elsif (defined $5) {
           $delim = $5;
        } else {
           if(! $::RETURN_ERRORS_TO_ORIGIN) {
               mail_print "\n\nCould not parse boundary from multipart/alternative $head{'content-type', 0}\n";
               return &EX_OK;
           } else {
               print STDERR "Could not parse boundary from multipart/alternative $head{'content-type', 0}\n";
               return &EX_NOPERM;
           }
        }

#       $head{'content-type',0} =~ /^\s*multipart\/alternative;.*?(boundary)=(\"?)([^\2]*)(\2)/i) {
	# print "Quote = $2, delimiter = $3, Quote = $4\n";
	my @sections = ();
	mimesplit($delim, @$body, @sections);
	my $winsect = -1;
	my $winval = 99;
	parse_alternative_body(@sections, $winsect, $winval, @routine);
	if($winsect == -1) {
	    mail_print "\n\n[demime found a multipart/alternative section which it tried\nto parse but could not find any section which it could render. Please send plain text.]\n";
	    return;
	}
        {
	  my $endhead;
	  my $fromhead ='';
	  my %headtypes = (); 
	  my @headarr = (); 
	  my %head = (); 
	  my @headkey = (); 
	  my $envfrom = "";	### tneff
	  parsehead(@{$sections[$winsect]->[4]},
		    $endhead, $fromhead, %headtypes, @head, %head, @headkey, $envfrom); 	### tneff

&{$routine[$winval]}($sections[$winsect]->[3], 
                               $head{'content-transfer-encoding',0});
        }
    } else {
	mail_print "\n\n[$main::demime_version could not find the separator in content-type header:\n";
	if(defined $head{'content-type', 0}) {
	    mail_print ($head{'content-type', 0},"]\n");
	} else {
	    mail_print (@$inhead,"]\n");
	}
    }
    no strict;
}

sub parse822 (\@$$) {
    use strict;

my ($mail, $encoding, $recurdepth) = @_;

my $deferred_message = "";
    
    if (defined $encoding) {
	if ("quoted-printable" eq lc $encoding) {
	    $mail = decode_quoted_printable(@$mail);
	} elsif ("base64" eq lc $encoding) {
	    $mail = decode_base64(@$mail);
	} elsif ($encoding !~ /7bit|8bit|binary/i) {
	    if($recurdepth == 1) {
		$deferred_message = "X-demime-error: [demime could not interpret encoding $encoding - treating as plain text]\n";
	    } else {
		mail_print "[demime could not interpret encoding $encoding - treating as plain text]\n";
	    }
	}
    }

# These global vars are used by parsehead when parsing the header
    # and will contain a structured version of the current level mail
    # header when parsehead is done.
    my @head = ();
    my %head = ();
    my %headtypes = ();
    my @headkey = ();
    my $fromhead = "";
    my $envfrom = "";	### tneff
    
    my $endhead = $[;

my $i;
    my $s;

# Parse out the mainline mail header.

parsehead(@$mail, $endhead, $fromhead, %headtypes, @head, %head, @headkey, $envfrom);	### tneff
    
    my $content_transfer_encoding = $head{'content-transfer-encoding', 0};

if($recurdepth == 1) {

$main::fromhead = $fromhead;

# Remove some headers that, if they are there, will screw up the mail
	# reposting, or possibly confuse some products, 
	# or are likely inappropriate for mailing lists, I dunno.

delhead("encoding", -1, @headkey);
	delhead("x-ms-attachment", -1, @headkey);
	delhead("x-uid", -1, @headkey);
	delhead("status", -1, @headkey);
	delhead("disposition-notification-to", -1, @headkey);
	delhead('x-juno-line-breaks', -1, @headkey);
	delhead('x-ms-tnef-correlator', -1, @headkey);
	delhead('x-msmail-priority', -1, @headkey);
	delhead('x-mimeole', -1, @headkey);
	delhead('importance', -1, @headkey);
	delhead('x-priority', -1, @headkey);
	delhead('content-disposition',-1,@headkey);
	# The following headers are removed as part of incredimail cleanup.
	delhead('x-fid', -1, @headkey);
	delhead('x-fver', -1, @headkey);
	delhead('x-bg', -1, @headkey);
	delhead('x-bgt', -1, @headkey);
	delhead('x-bgc', -1, @headkey);
	delhead('x-bgpx', -1, @headkey);
	delhead('x-bgpy', -1, @headkey);
	delhead('x-asn', -1, @headkey);
	delhead('x-asnf', -1, @headkey);
	delhead('x-ash', -1, @headkey);
	delhead('x-ashf', -1, @headkey);
	delhead('x-an', -1, @headkey);
	delhead('x-anf', -1, @headkey);
	delhead('x-ap', -1, @headkey);
	delhead('x-apf', -1, @headkey);
	delhead('x-ad', -1, @headkey);
	delhead('x-adf', -1, @headkey);
	delhead('x-auto', -1, @headkey);
	delhead('x-cnt', -1, @headkey);
# An advertising header
	delhead('x-hotpop', -1, @headkey);
	# the following decryption will be done in our lifetime.
	$head{'content-transfer-encoding', 0} = 
	    ($main::SEVEN_BIT_ONLY?"7bit":"8bit")
		if defined $head{'content-transfer-encoding', 0};
    }

# headout(@headkey, %head); # for debuggery only.

# OK, we have a couple of alternatives:
    # 1.  This will be a multipart/alternative. We figure out which part what is and throw away
    #     as much as we can.  We try to leave ourselves with a text/plain (1) text/rich (2) or
    #     text/html (3) in those three priorities.
    # 2.  This will be a singlepart.  We will process text/html or text/rich into text/plain,
    #     using richtext or the Volunteer HTML formatting classes - we don't want to do a 
    #     wonderful job of formatting - we want to get it into plain text.
    # 3.  This will not be mime at all.  Whoopie.  Just pass it all through.
    #     (Except for uuencoded stuff.)
    # 4.  This will be a multipart/mixed.  Each section is processed, including one level of
    #     descending into multipart/alternative.  In a mixed, every renderable section is
    #     rendered.  If there is more than one text/plain, or a text/plain and a text/html,
    #     they are all rendered.

if ((not defined $head{'content-type',0}) or $head{'content-type',0} =~ /^\s*text\/plain/i
	or ($recurdepth == 1 && $head{'content-type',0} =~ /^\s*application\/pgp/i)
	or $head{'content-type',0} =~ /^\s*text\s*$/i) {
	&adj_msgid if $recurdepth == 1;
	if (defined $head{'content-type',0}) {
	    if($recurdepth == 1 && $head{'content-type',0} =~ /^\s*application\/pgp/i) {
		$head{'content-type',0} = "text/plain";
	    } else {
		$head{'content-type',0} =~ s/^\s*text\s*$/text\/plain/;
	    }
	}
# Untested code.
#	if(defined $head{'content-transfer-encoding',0} and 
#	   $head{'content-transfer-encoding', 0} =~ /(base64)/i) {
#	    $head{'content-transfer-encoding', 0} = '8bit';
#	    headout(@headkey, %head);
#	    mail_print "X-MIME-Autoconverted: from base64 to 8bit by $main::demime_version\n";
#	    mail_print "\n\n";
#	    my @body = @{$mail}[$endhead..$#{$mail}];
#	    textout(@{decode_base64(@body)});
#	    return &EX_OK;
#	}
# end untested code
	if ($::print_extra_headers) {
	    headout(@headkey, %head, $deferred_message, $envfrom); ### tneff
	    mail_print "\n";
	}
	textout([ @{$mail}[$endhead..$#{$mail}] ], 
		$content_transfer_encoding);
	return &EX_OK;
    }

if($head{'content-type',0} =~ /^\s*text\/(en)?rich(ed)?($|\s|\s*;)/i) {
	my ($saverich) = split(/;/,$head{'content-type',0});
	$head{'content-type',0} = "text/plain; charset=\"us-ascii\"";
	adj_msgid if $recurdepth == 1;
	if($::print_extra_headers) {
	    headout(@headkey, %head, $deferred_message, $envfrom); ### tneff
	    mail_print "X-Converted-To-Plain-Text: from $saverich by $main::demime_version\n\n";
	}
	my @body = @{$mail}[$endhead..$#{$mail}];
	richout(\@body, $content_transfer_encoding);
	return &EX_OK;
    }

if($head{'content-type',0} =~ /^\s*text\/html?($|\s|\s*;)/i) {
	my ($saverich) = split(/;/,$head{'content-type',0});
	$head{'content-type',0} = "text/plain; charset=\"us-ascii\"";
	
	adj_msgid if $recurdepth == 1;
	if($::print_extra_headers) {
	    headout(@headkey, %head, $deferred_message, $envfrom); ### tneff
	    mail_print "X-Converted-To-Plain-Text: from $saverich by $main::demime_version\n\n";
	}
	htmlout([@{$mail}[$endhead..$#{$mail}]],$content_transfer_encoding);
	return &EX_OK;
    }

if($head{'content-type',0} =~ /^\s*message\/(rfc822|news)?($|\s|\s*;)/i) {
	my ($saverich) = split(/;/,$head{'content-type',0});
	$head{'content-type',0} = "text/plain; charset=\"us-ascii\"";
	
	adj_msgid if $recurdepth == 1;
	if($::print_extra_headers) {
	    headout(@headkey, %head, $deferred_message, $envfrom); ### tneff
	    mail_print "X-Converted-To-Plain-Text: from $saverich by $main::demime_version\n\n";
	}
	my @body = @{$mail}[$endhead..$#{$mail}];
	return parse822(@body, $content_transfer_encoding, $recurdepth+1);
    }
    
    my @sections = ();
    if($head{'content-type',0} =~ /^\s*multipart\/alternative\s*;.*?(boundary)=(?:(")([^"]*?)(")|([^;]+)(?:[;]|$))/i) { # nothing #
	
	# print "Quote = $2, delimiter = $3, Quote = $4, 5 = $5, 6 = $6, 7 = $7\n";
        my $delim;     
        if (defined $3) {
           $delim = $3;
        } elsif (defined $5) {
           $delim = $5;
        } else {
           if(!$::RETURN_ERRORS_TO_ORIGIN) {
               if($::print_extra_headers) {
	           $head{'content-type',0} = "text/plain; charset=\"us-ascii\"";
	           adj_msgid if $recurdepth == 1;
	           headout(@headkey, %head, $deferred_message, $envfrom);
               }
               mail_print "\n\nCould not parse boundary from multipart $head{'content-type', 0}\n";
               return &EX_OK;
           }
           print STDERR "598 Could not parse boundary from multipart $head{'content-type', 0}\n";
           return &EX_NOPERM;
        }

#    if($head{'content-type',0} =~ /^multipart\/alternative;.*?(boundary)=(\"?)([^\2]*?)(\2)/i) {
#	# print "Quote = $2, delimiter = $3, Quote = $4\n";
	my @body = @{$mail}[$endhead..$#{$mail}];
	
	mimesplit($delim, @body, @sections);
	# mimesplitprint(\@sections);
	my $winsect = -1;
	my $winval = 99;
	my @routine = ();
	parse_alternative_body(@sections, $winsect, $winval, @routine);
	if($winsect == -1) {
           if(!$::RETURN_ERRORS_TO_ORIGIN) {
               if($::print_extra_headers) {
	           $head{'content-type',0} = "text/plain; charset=\"us-ascii\"";
	           adj_msgid if $recurdepth == 1;
	           headout(@headkey, %head, $deferred_message, $envfrom);
               }
               mail_print "\n\n$main::demime_version can't find any section that it can interpret.  Tell sender to send plain text.\n";
               return &EX_OK;
           }
	   print STDERR "500 $main::demime_version can't find any section that it can interpret.  Please send plain text.\n";
	   return &EX_NOPERM;
	}
	# print "The winning section is $winsect with $winval\n";
	my ($saverich) = split(/;/,$head{'content-type',0});
	$head{'content-type',0} = "text/plain; charset=\"us-ascii\"";
	adj_msgid if $recurdepth == 1;
        if($::print_extra_headers) {
	    headout(@headkey, %head, $deferred_message, $envfrom); ### tneff
	    mail_print "X-Converted-To-Plain-Text: from $saverich by $main::demime_version\n";
	    mail_print ("X-Converted-To-Plain-Text: Alternative section used was ",
		        $sections[$winsect]->[2],"\n\n");
        }
	my $endhead;
	my $fromhead ='';
	my %headtypes = (); 
	my @headarr = (); 
	my %head = (); 
	my @headkey = (); 
	my $envfrom = "";	### tneff
	parsehead(@{$sections[$winsect]->[4]},
		  $endhead, $fromhead, %headtypes, @head, %head, @headkey, $envfrom); 	### tneff
	
	&{$routine[$winval]}($sections[$winsect]->[3],
                             $head{'content-transfer-encoding',0});
	return &EX_OK;
    }
    if($head{'content-type',0} =~ /^\s*multipart\/(?:mixed|signed|related|parallel|report)\s*;.*?(boundary)=(?:(")([^"]*?)(")|([^;]+)(?:[;]|$))/i) { # nothing #
	
	# print "Quote = $2, delimiter = $3, Quote = $4, 5 = $5, 6 = $6, 7 = $7\n";
        my $delim;     
        if (defined $3) {
           $delim = $3;
        } elsif (defined $5) {
           $delim = $5;
        } else {
           if(!$::RETURN_ERRORS_TO_ORIGIN) {
               if($::print_extra_headers) {
		   $head{'content-type',0} = "text/plain; charset=\"us-ascii\"";
		   adj_msgid if $recurdepth == 1;
	           headout(@headkey, %head, $deferred_message, $envfrom);
               }
               mail_print "\n\nCould not parse boundary from multipart $head{'content-type', 0}\n";
               return &EX_OK;
           }
           print STDERR "598 Could not parse boundary from multipart $head{'content-type', 0}\n";
           return &EX_NOPERM;
        }   
	
	my @body = @{$mail}[$endhead..$#{$mail}];
	
	mimesplit($delim,@body,@sections);
	# mimesplitprint(\@sections);
	my $winsect = -1;
	my $winval = 99;
	my %selval;
	my @routine;
	if($main::EXPAND_MULTIPART_RFC822_SECTION) {
	    %selval = ("text/plain" => 0 , "text/html" => 1, "text/enriched" => 2,
			  "text/rich" => 2, "multipart/alternative" => 3, 
			  "message/rfc822" => 4, "message/news" => 4, "multipart/related" => 4, "message/delivery-status" => 0);
	    @routine = (\&textout, \&htmlout, \&richout, \&altout, \&parse822);
	} else {
	    %selval = ("text/plain" => 0 , "text/html" => 1, "text/enriched" => 2,
		       "text/rich" => 2, "multipart/alternative" => 3,
		       "message/delivery-status" => 0);
	    @routine = (\&textout, \&htmlout, \&richout, \&altout);
	}
	for($i = 0; $i < @sections; $i ++) {
	    $s = lc ( $sections[$i]->[2]) ;
	    if(defined $selval{$s}) {
		if($selval{$s} < $winval) {
		    $winsect = $i;
		    $winval = $selval{$s};
		}
	    }
	}
	my ($saverich) = split(/;/,$head{'content-type',0});
	if($winsect == -1) {
	    if(!$::RETURN_ERRORS_TO_ORIGIN) {
               if($::print_extra_headers) {
		   $head{'content-type',0} = "text/plain; charset=\"us-ascii\"";
		   adj_msgid if $recurdepth == 1;
	           headout(@headkey, %head, $deferred_message, $envfrom);
               }
               mail_print "\n\n$main::demime_version can't find any section that it can interpret in the $saverich.  Tell sender to send plain text.\n";
               return &EX_OK;
            }
	    print STDERR "500 $main::demime_version can't find any section that it can interpret in your $saverich.  Please send plain text.\n";
	    return &EX_NOPERM;
	}
	# print "The winning section has $winval\n";
	$head{'content-type',0} = "text/plain; charset=\"us-ascii\"";
	adj_msgid if $recurdepth == 1;
        if($::print_extra_headers) {
	    headout(@headkey, %head, $deferred_message, $envfrom); ### tneff
	    mail_print "X-Converted-To-Plain-Text: from $saverich by $main::demime_version\n";
	    mail_print ("X-Converted-To-Plain-Text: Alternative section used was ",
		        $sections[$winsect]->[2],"\n\n");
	}
	for($i = 0; $i < @sections; $i ++) {
	    $s = lc ($sections[$i]->[2]);
	    # if(defined $selval{$s} and $selval{$s} == $winval) {
	    my $endhead;
	    my $fromhead ='';
	    my %headtypes = (); 
	    my @headarr = (); 
	    my %head = (); 
	    my @headkey = (); 
	    my $envfrom = "";	### tneff
	    parsehead(@{$sections[$i]->[4]},
		      $endhead, $fromhead, %headtypes, @head, %head, @headkey, $envfrom);	### tneff
	    if(defined $selval{$s}) {
#		if(defined $head{"content-transfer-encoding",0}) {
#		    my $cte = lc $head{'content-transfer-encoding',0};
#		    if($cte eq "base64") {
#			my $decoded = decode_base64(@{$sections[$i]->[3]});
#			&{$routine[$selval{$s}]}($decoded, $recurdepth+1, $sections[$i]->[4]);
#		    } else {
#			&{$routine[$selval{$s}]}($sections[$i]->[3], 
#						 $recurdepth+1, 
#						 $sections[$i]->[4]);
#		    }
#		} else {
                    my($relatedflag) = 0;
                    if ($s eq 'multipart/related') {
                       $relatedflag = $::print_extra_headers;
                       $::print_extra_headers = 0;
                    }
                    
		    &{$routine[$selval{$s}]}($sections[$i]->[3], 
                                             $head{'content-transfer-encoding',0},
					     $recurdepth+1, 
					     $sections[$i]->[4]);
                   $::print_extra_headers = $relatedflag if $relatedflag;
#		}
	    } else {
		if(not defined $head{'content-type', 0}) {
		    unless (defined $main::nowarn) {
			mail_print "\n[$main::demime_version removed a section which didn't have a content-type header]\n";
		    }
		} else {
		    my $ct = $head{'content-type',0};
                    # worked under an older version of perl
		    # undef $1; undef $2; undef $3; undef $4; undef $5;
		    if($ct =~ /^([-0-9a-zA-Z]+\/[-a-zA-Z0-9]+)(;.*?(name|filename)=(\"?)([^\4]*)(\4))/i) {
			if(defined $1 and not defined $main::nowarn) {
			    mail_print "\n[$main::demime_version removed an attachment of type $1";
			    if(defined $3) {
				mail_print " which had a $3 of $5";
			    }
			    mail_print "]\n";
			}
		    } elsif($ct =~ /^([-0-9a-zA-Z]+\/[-a-zA-Z0-9]+)/) {
			unless (defined $main::nowarn) {
			    mail_print "\n[$main::demime_version removed an attachment of type $1]\n";
			}
		    } else {
			unless (defined $main::nowarn) {
			    mail_print "\n[$main::demime_version removed an attachment with a content-type header it could not parse.]\n";
			    mail_print "[Content-Type: $ct]\n";
			}
		    }
		}
	    }
	}
	
	return &EX_OK;
    }
    if(!$::RETURN_ERRORS_TO_ORIGIN) {
	if($::print_extra_headers) {
	    $head{'content-type',0} = "text/plain; charset=\"us-ascii\"";
	    adj_msgid if $recurdepth == 1;
	    headout(@headkey, %head, $deferred_message, $envfrom);
	}
	mail_print "\n\nThis program can't yet handle mime type ", $head{'content-type',0},"\n";
	return &EX_OK;
    }
    print STDERR "599 This program can't yet handle mime type ", $head{'content-type',0},"\n";
    return &EX_NOPERM;
    no strict;
}

# End subroutines

# Everything else is POD...

=head1 NAME

demime - Removes mime attachments and other cruft from e-mail

=head1 SYNOPSIS

=head1 DESCRIPTION

There are two major features of demime - mime removal and advertising
signature removal.

=head2 Mime Removal

demime reads a piece of e-mail from standard input.  It is designed to
be invoked directly as an alias program in /etc/aliases or by using
majordomo's wrapper program.  It attempts to remove all mime cruft
from the piece of mail, including alternative sections and attachments
and output simple plain text, rendered as well as it possibly can.

It is meant for the mailing list manager who wants to see an end to
attachments and unreadable cruft on their mailing list.  They can
put it into the input stream to make their mime troubles go away.

It can also be used by an individual user who wants to remove all
attachments before they read mail.  On at least one of the mailing
lists I read, people are constantly sending huge attachments and
alternate sections.  I filter all those through demime using maildrop
(although procmail can be used as well).

Basically, mime is fine if you are sending to another like mailer.  If
you are using Eudora, and another Eudora user sends you mail, you are
likely to interpret things in exactly the same manner.  But if you are
a Eudora 3 user and a Netscape user sends you html mail, it is likely
that the mail will appear right justified because of some bug or
other.  Cross-client mime is just not ready for prime time.

Also, the Majordomo Mailing List Manager inserts whatever is in the
input stream into the digest after removing most of the headers.
Specifically, such headers as 'Content-type' are removed, leaving
readers no way to decode those sections.  This means that digest
readers frequently have to skip attachment after attachment and it
becomes difficult if not impossible for them to make heads or tails
out of what comes from the digest - they also have no visual clue,
unless they read very carefully, as to when they are in a quoted
message, alternative section and so forth.

Finally, mime can hide trojan horses.  File attachments to messages
can contain viruses, and some mailers have been shown to be subject to
attack from unruly javascripts which are imbedded in html sections.

Because of the above, sending mime to mailing lists is probably not a
good thing to do.  It is quite unlikely that your recipients will
interpret your mime attachments in the way you mean them to, unless
they happen to have exactly the right mailer.

Microsoft uses various forms of attachments to, I believe, provide
formatting hints.  These attachments are frequently provided as
uuencoded files right in stream, although they may be mime as well.
Those attachments are stripped out by demime.  To folks not using
Microsoft mailers, these attachments are useless overhead.

=head2 Advertising Removal

Common patterns for footers added by such as Juno and Hotmail are
detected and those signature blocks are removed.  This behavior can be
inhibited by setting the $AD_REMOVE variable in the demime program
itself to 0, or by specifying -noa or --noadremove.  See also L</FILES> 
for the location and format of the file that allows you to control 
the matching.

=head2 Parameters

=item -p | --[no]preservefrom

Controls whether demime passes the Unix style "From" line through, if it
exists.  Normally defaults to true, except in special situations, should
probably be left as true.

=item -f | --[no]forwarderror

Controls whether certain errors are bounced back to the origin or
forwarded. Typically, the sort of error that is handled this way is an
error where no section can be interpreted by demime, or when the
format of the mime is screwed up such that the parsing simply will not
complete.  noforwarderror is the default - demime produces an error on
standard output, and returns a code that tells the MTA that there has
been a failure.  forwarderror attempts to produce the output and the
error message to standard output.  If you were using demime in a pipe,
using the -f flag might be more appropriate.

=item -x(=| )string | --prefixchar(=| )string

String, which normally defaults to '|', is used by demime to indicate that
demime should start a pipe and pass the processed mail to the pipe.  This is
explained under $::MAJIC_PIPE_PREFIX_CHAR in the explaination of "target 
positional parameter", below.

=item -d | --debug

Runs demime in debugging mode.  Currently the only effect of this is
to force things which might go to syslog to always go to stderr.

=item -i(=| )/path/to/file | --debuginput(=| )/path/to/file

For debugging, the input file can be specified on the command line. 
Setting this also sets -d.

=item -j(=| )/path/to/junkmail/file | --junkmail_file(=| )/path/to/junkmail/file

Defaults to /usr/lib/majordomo/demime_junkmail.cf. The path to the
file where the ad removal parameters are kept.

=item -[no]a | --[no]adremove

Controls whether advertising removal is attempted.  As distributed, the 
default is to remove advertising, and it can be negated.

=item -[no]7bit | -7 | -8bit | -8

Normally, demime strips output to seven bit.  If you typically use a
character set which requires that eight bit characters be passed through,
set -8, -no7bit or -8bit to turn off the stripping. If you are using
plain ascii on a US English mailing list, you probably want to keep the
default and strip body output to seven bits.

=item --[no]eliderfc822

When a multipart/mixed or a multipart/alternative contains a
message/rfc822 or message/news internal section, there exists a
question as to what to do with that contained section.  It might be
the right thing to elide the entire contained section (if you have
people who are web TV subscribers who can only reply by attaching the
entire original message).  It might be the right thing to treat the
message as an internal plain text section and to demime it.  The
default action of the script is to demime the contained message.  The
alternative is to elide the contained mime section.

=item -w(=| )(0|1|2) | --warnings-to-syslog(= )(0|1|2)

Normally, warnings go to syslog.  If debug is set, warnings go to
stderr. That behaviour can be overridden if you set this. 0 says that
warnings should always go to stderr, 1 says that warnings should go
to syslog if stderr is not a terminal and to stderr if there is a tty
and 2 says to always send warnings to stderr. Normally defaults to 
0 if -d is set and 1 if -d is not set.

=item --uselynx

This operand causes demime to use the lynx browser to interpret the html 
sections. The default for this is nouselynx if HTML::FormatText is installed
and yes if it is not installed.  Your version of lynx must be recent enough to
support the --stdin command line argument.

Lynx is called with these arguments:
lynx --stdin --dump --force_html --hiddenlinks=ignore --localhost --image_links 
--nolist --noredir --noreferer --realm

It must be in your path for this to work.

=item --[no]quiet

This parameter, if specified, will result in some messages
that were output to indicate where stuff was elided not being
produced.  That is, the attachments will be deleted silently instead of
having notations put into the message body that an attachment was 
deleted.

=item target positional parameter: relay|-|>&=d|'|pipe as argument'

This required option indicates the mailing address that should get the
reformatted message.  If you want the message on stdout, use '-' as
the address.  The address to send to will not be read from the mail
file, for security reasons.

You may specify a list of addresses.  Simply insure that they are passed
as one token and separated by semicolons.  If you use sendmail, an alias
such as:

realuser: "| demime '-;\realuser;otheruser' | other_program"

may be useful.  It will deliver both to the next program in the pipe and
to the mail file belonging to the real user that you are aliasing.

Finally, specifying such as

realuser: "| demime '-;\realuser;>&=5' 5>>/tmp/trackfile | other_program"

might be useful for debugging, although hardly as a reliable log since
no locking against interlacing is performed.  Note that the >&=digit
syntax is checked for specifically and that you must arrange to have
the file descriptor opened for demime if you use this syntax.  Another
possibility would be

realuser: "| demime '-;\realuser;>&=2' | other_program"

to put a copy of the message on standard error as well.

If you specify a pipe like

realuser: "|demime - | other_program"

and there is a demime failure, other program will have been invoked.  
It might get just a null input, in which case, it might do the wrong thing.
Demime's return code will be ignored as well.  In other words, demime might 
fail to decode the message and return something descriptive on stderr, or 
might simply want the MTA to requeue, but the return code will be hidden.

If this possibility bothers you, you can specify the logical equivalent of 
the above as

realuser: "|demime  '| other_program'"

or, as a more complex example:

realuser: "|demime '-;root;| some_other_program'"|other_program

Which will cause the MTA to start demime and other_program, and then, when
output is ready, demime will send it to standard output, mail it to root, 
and invoke the pipe and send it to that program as well.  I'm now using the 
simpler of the above two cases to invoke the majordomo programs via wrapper 
to preserve the demime failure codes, if any.

This causes demime to simply put whatever you specify as a single token
and open its own pipe to it.  Note that if there are any shell metacharacters
that it will invoke a shell, as per typical perl.  You may not specify a pipe
with a ';' in it, as the semicolon split is done earlier.  If demime fails
before it has anything to write, the other_program will never be invoked.
Upon normal failure, demime collects return codes from any copies of sendmail
it involes, any pipes it invokes, (with special treatment for the first pipe
specified) and then any internal return codes.

smrsh can't deal with the | as a pipe character.  Edit the script and 
change $MAJIC_PIPE_PREFIX_CHAR to some other leading character(s), say '==' 
(or set it with -x above).

Then you can specify the alias as

realuser: "|demime -x '==' '== other_program'"

and demime will convert it internally to

realuser: "|demime '| other_program'"

and then run it as a pipe, as above.  This is only a requirement to get
around a limitation in smrsh for sendmail.

If the first pipe has died on a signal, EX_TEMPFAIL will be returned.

If the first pipe has returned a return code, then that return code will be
returned by demime.

If any other program has returned a non-zero return code, that return code 
will be returned by demime.

Demime's internal return code is returned.  This may be EX_OK (0) or some
other code that indicates a temporary or permanent failure to the MTA.
If demime has not yet tried to produce any output, none of the other 
possibilities will apply.

=head2 What demime will do when faced with different types of input:

=item B<text/plain or no content type in mail header>

The content will be passed through without reformatting.  A scan will
be done to determine if there are uuencoded files instream If found,
they will be replaced by a note.  Content-type: text all by itself on
the header line will be converted to text/plain.  Some versions of elm
incorrectly send 'text' as a content-type.

=item B<text/enriched>

A very simple formatter which is built into demime will attempt to do
the mimimum amount of formatting possible.  exerpt, lt, nl, and np
tags will be respected (np is executed as a double nl.  Comments and
params will be elided and all other tags will be ignored.

=item B<text/html>

The HTTP::FormatText class will be used to format the input into
simple text.  No additional formatting will be done.

=item B<message/rfc822>

An email which is a single message/rfc822 will be expanded such that
this piece of e-mail is interpreted as if it were at the top level.
If the message/rfc822 has sections, they will be interpreted as if it
were at top level.  This only is done if the message/rfc822 is the
type of the entire body.  If there is a multipart/mixed where one of
the sections is message/rfc822, this section will be elided, and not
considered for interpretation.

This is only done because some CCMail users produce this structure if
they forward a message and then change content.  It does not quite
seem that this is the right thing to do, but we are trying to be
liberal with what we accept while eliminating as much cruft as
possible.  In general, it seems wrong to recursively flatten included
rfc822 sections in a multipart/mixed.  So far, the ones I've seen seem
to be cruft.

A message/rfc822 in a multipart/mixed may be flattened or elided.
This is dependent on the setting of the
EXPAND_MULTIPART_RFC822_SECTION configuration variable in the script
header.  If expanded, it will be treated as a top level
message/rfc822. This switch also determined whether a multipart/related
will be flattened or elided.

=item B<message/delivery-status>

Treated as text/plain.

=item B<message/news>

Treated exactly like message/rfc822.

=item B<multipart/alternative>

If a text/plain section is available, it will be displayed.  If no
text/plain is available, but a text/html is available, it will be
interpreted and displayed instead.  If no text/plain or text/html is
available, but a text/enriched is available, it will be displayed.  If
none of these are available, a message indicating that the mail cannot
be interpreted will be displayed and the mail will be returned to the
sender (by returning EX_NOPERM from sysexits.h), assuming that it is
being invoked from a sendmail alias.  The non-displayed alternetive
sections will be silently ignored - that is, no inline message will be
displayed.  At top level, a header will be added indicating which
alternative section was selected.

=item B<multipart/mixed> or B<multipart/parallel>

Any items that are text/html, text/enriched, or text/plain will be
interpreted inline as if they were stand-alone, one after the other in
the order presented.  If a multipart/alternative is presented inside
of a top level multipart/mixed, that item wll be interpreted according
to the rules for a top level multipart/alternative (the most
renderable section will be rendered), except that failure to find an
interpretable section will result in an inline message being inserted
into the output stream rather than a mailbounce, and no header
indication will be made of which section was selected for rendering.

A section of message/rfc822 may be expanded or elided, depending on
the setting of EXPAND_MULTIPART_RFC822_SECTION.  It is likely that
these sections should generally be elided for typical mailing list
usage.

Other mime types will be elided from the output stream and replaced by
a message that this has been done unless demime is in quiet mode.

=item B<multipart/signed or multipart/related>

At top level, treated like a multipart/mixed.  Renderable sections are
rendered, and unrenderable sections, specifically the PGP signature,
are elided. If the switch that turns on desending into a message/rfc822
is set, the program will descend into any multipart/related it finds, 
rendering text sections (including one of alternates) and eliding other 
sections.

=item B<Unknown>

If the program does not recognize the top level mime type of the mail
then a message will be printed and the mail will be bounced.

=head1 FILES

If the installer has left $AD_REMOVE = 1 in the program header (the
default) the program will try to read the configuration file named in 
the variable $junkmail_file, which is set to 
F</usr/lib/majordomo/demime_junkmail.cf> in the distribution.  This file
contains lines in the following format:

[prefix_match]
 /regex/
 /regex/
 [suffix_match]
 /regex/
 /regex/
 [prefix_match_x]
 /regex/
 /regex/
 [center_match_x]
 /regex/
 [suffix_match_x]
 /regex/
 /regex/
 [prefix_match_y]
 /regex/
 /regex/
 [suffix_match_y]
 /regex/
 /regex/
 [prefix_match_z]
 /regex/
 /regex/

The regular expressions must be valid perl regular expressions.  Blank 
lines, lines starting #, ; or //.. are considered comments and ignored.

Prefix_match is meant to contain regular expressions that match
"introducers".  Many of the advertising signatures use lines of
underscores or dashes as introducers to their automatically added
advertising signatures.  Suffix_match lines contain lines of things
following introducers, such as yahoo or bigfoot advertising dreck.
The use of introducers is designed to make the possibility of a false
match (against someone who uses a legitimate signature that uses, say,
a yahoo address) less likely.

More than one [prefix_match] and [suffix_match] section may be
specified, so that you can logically group the sections together so as
to show that you are eliding particular sections of .signatures.
However, the program will mash all [prefix_match] sections and all
[suffix_match] sections together.  If you have decided to work without
"introducers", then specify the [prefix_match] section only.

If you specify a [prefix_match_X] where X can be anything you want,
and a [suffix_match_X], where X corresponds with the X specified for
[prefix_match_X] this will be treated as a separate tree.  The prefix
in this list must preceed the suffixes in this list for this group to
work and cause the section to be elided.  There can be more than one
group, of course, that is, you can have [prefix_match_yahoo] with
[suffix_match_yahoo] and [prefix_match_altavista] with
[suffix_match_altavista].

The effect of this is that once a prefix matches, the next line is
checked to see if it matches any suffix in that section.  If it does,
then the blank lines before the prefix, the prefix, and all lines as
long as they match any regexp in the suffix are elided.  The eliding
happens when the first line does not match the suffix section for that
prefix, and that line is then checked against the list of prefixes.

If there is no [center_match] or [suffix_match] for a group, any line
that matches any prefix regex is elided.

If a [center_match_X] is part of a match group, then things act a
little differently.  A pattern in [prefix_match_X] must match for
things to kick off.  Once a section with a center is active, no
sections without a center are looked at.  Then a pattern in
[center_match_X] must match.  Then a pattern in [suffix_match_X] must
match.  If all this happens, before end of file then the section will
be elided when the B<first> suffix pattern matches.  However, while a
prefix/center/suffix combo is active, there is the possibility of a
runaway.  That is, because a prefix could match an unrelated line, and
not every line in a prefix/center group must match, a false match
againse a prefix could cause the rest of the line to not be checked.
Until a suffix match occurs, every prefix from every match group
without a center is checked against that line.  If any of those
prefixes match, the program decided that this is a false indication
and does not delete the group - it throws away its current state and
starts over with that line, checking that line against all prefixes.

If a prefix from more than one prefix match section (without a center)
matches, the suffixes for those prefixes are all checked against the
next lines.  If no suffix for that prefix matches, it is simply
removed from the "check" list.  But, at this time, if any suffix
matches, the first pattern to not match closes the match.  The last
pattern that contains a matching suffix (that is, the last closed
match group) defines the high limit of the group of lines to be
elided.

Similarly, if more than one prefix match/center match/suffix match
section matches, they are put in an active list and they are all
matched against subsequent lines.  If the suffixes match before the
centers match, they are elided from the match list.  But when the
first one "closes", (that is, the prefix, center, and suffix match
cycle completes) the eliding will be done and the pending match state
for all matches will be reset.

Regular expressions must start and end with a C</> (which is actually
parsed off so that the patterns can be run without evaling a literal.
If you need to specify a modifier, use the (?i) extension syntax
(where, as an example, (?i) at the beginning of the pattern makes it
case insensitive).  See L<perlre> for details on the extension syntax.

The program assembles the mail file section as an array of lines and 
then works forward through the lines.

As it marches forward, (ignoring all blank lines or lines that consist
only of the normal quote sign, the >) it matches all lines, against
the regular expressions in [prefix_match], and, if specified,
[prefix_match_group1], [prefix_match_group2] etc.  If none of these
match, it goes on to the next line.  All of the prefixes that have a
matching regular expression are made "active".  If none are active at
the end of the cycle, the next line is checked against the prefixes.

This is important because every line, pretty much, is checked against
all of the prefixes.  The execution speed of this process is directly
proportional to the number of prefix regexps (and to a lesser extent,
the number of sections in the control file).  It is assumed that
suffixes will be matched against fewer lines than the prefixes are -
but that is up to the user.  General enough prefixes will cause the
suffixes to be checked a lot.

If there are match sections that have 'center' sections activated on
the same line as sections that do not have 'center' sections, the ones
without 'center' sections are ignored.

=head1 ERROR REPORTING

Some errors, such as mime types that are not parsable, are reflected
directly to the mail sender as a bounce.  This is slightly unruly, but
seems to be the right place to vector such things.  The program will
put descriptive messages on STDERR and return with EX_NOPERM as
described above.

Other errors, such as errors in the format of regular expressions in
the control file should not cause mail to bounce but should be
reported somewhere.  By default, perl's normal warn statement is used
by the inner routines to report such problems.  This is optionally
intercepted and converted to a syslog message.  The default behaviour
is to report to syslog if STDERR is not a tty device, and to report to
STDERR if it is a tty device.  This means that the following
unexpected behaviour can occur, if the following stage is run from the 
console:

demime < mail_input 2>&1 | less

This is, of course, a syntax error.  However, the message regarding
that is sent to syslog.  To change this behaviour, change the
WARNINGS_TO_SYSLOG variable by editing the perl script (or set the 
--warnings_to_syslog command line variable.  Setting it to
0 will always send warnings to STDERR, setting it to 1, the default,
will work as described above, and setting it to 2 will force all
warnings to syslog, even if demime is running from a terminal.  If the
-d flag is set, warnings always go to STDERR.

Any messages from a 'die' at top level are sent to STDERR.  If
warnings are being sent to syslog, the error is logged to syslog as
well.  These errors are typically errors that will not allow the
program to continue.

If you need to elide the unix "From " line for archive separation,
edit the script and find the variable $PRESERVE_UNIX_FROM_LINE and set
it to 0, or set the --nopreservefrom command line switch.

=head1 BUGS

There are clearly many more mime types and so forth than I am parsing
or am ever likely to parse.  Nesting is an issue - I so not parse down
into a tree except for the limited case of a multipart/alternative
inside of a multipart/mixed or included sections inside of a top level
message/rfc822.  I suspect that I should parse a mixed inside of a
mixed, except that I've never been presented with a test case where a
mailer produced a mixed in a mixed that I wanted to keep in the output
stream. I do descend more generally into multipart/related and mixed as
of 99c, if the user turns on the options that aggressively descend into
message/rfc822

This program should be restructured such that it is completely
recursive such that it can parse arbitrarialy nested structures, just
for neatness sake, even if that ends up not being a good idea.  Some
structuring has been done, but more needs to be done.

I don't deal with digests at all.  For that matter, I am not sure if I
should.  If someone sends in a message/digest, what should I do? Try
to flatten it and convert it to RFC 1153 format by flattening each
message as if it were at top level, and eliding headers as
appropriate?  Is anyone even doing message/digest from a mailing list
manager?  If someone has a sample they could send me, I'd appreciate
it.

People keep on inventing new mime types. The message/signed type probably
should be treated like plain text but is not.

Of course, the first bug is mime itself.  Mime should have been made
transparently downward compatible with existing plain text mail
systems or not done at all.  That should have, for example, included
the ability to verify receiving capability before sending such that
only mail that could have been understood would ever be sent.
Complex, but the alternative was to break all mail systems, which was
the choice that was made.

=head1 SEE ALSO

L<HTML::FormatText>. L<mime(1)>.

=head1 COPYRIGHT

This program is free software; you can redistribute it and/or
modify it under the same terms as perl itself.  You may not, however,
copy code from this module to your own programs without crediting the
author.

There is no warranty on this code, nor is there an implied warranty of
suitability for purpose.  Use at your own risk.

=head1 AUTHOR

Nick Simicich <njs@scifi.squawk.com>

If you shoot mime, do you need to do so silently?

=head1 AVAILABILITY

The latest version of this package is likely to be available from
http://scifi.squawk.com/demime.html

=cut