#
# -*- Perl -*-
#  chm (windows help/compressed html) filter for namazu
#  Copyright (C) 2007 Alexander Oelzant <alexander@oelzant.priv.at>
#  using parts from zip.pl, which is
#  Copyright (C) 2004 MATSUMURA Namihiko <po-jp@counterghost.net>
#                2004 Yukio USUDA <usu@namazu.org>
#                2004-2005 Namazu Project All rights reserved.
#
#     This is free software with ABSOLUTELY NO WARRANTY.
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either versions 2, or (at your option)
#  any later version.
# 
#  This program is distributed in the hope that it will be useful
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
#  02111-1307, USA
#

package chm;
use strict;
require 'util.pl';

sub mediatype() {
    return ('application/x-chm');
}

my $archmagepath="archmage";

sub status() {
    return 'yes' if (util::checkcmd($archmagepath));
    return 'no';
}

sub recursive() {
    return 0;
}

sub pre_codeconv() {
    return 0;
}

sub post_codeconv () {
    return 0;
}

sub add_magic ($) {
    my ($magic) = @_;
    $magic->addFileExts('\\.chm', 'application/x-chm');
    $magic->addFileExts('\\.CHM', 'application/x-chm');
    $magic->addMagicEntry("0\tstring\tITSF\003\000\000\000\x60\000\000\000\001\000\000\000\tapplication/x-chm");
    return;
}

sub filter ($$$$$) {
    my ($orig_cfile, $contref, $weighted_str, $headings, $fields)
      = @_;

    my $tmpfile;
    my $uniqnumber = int(rand(10000));
    do {
	$tmpfile = util::tmpnam('NMZ.chm' . substr("000$uniqnumber", -4));
	$uniqnumber++;
    } while (-f $tmpfile);

    {
	my $fh = util::efopen("> $tmpfile");
	print $fh $$contref;
        util::fclose($fh);
    }

    $$contref ="";
    my $err = undef;
    $err = unchm_filter($tmpfile, $contref, $weighted_str, $headings, $fields);

    unlink($tmpfile);
    return $err;
}

sub unchm_filter ($$$$$) {
    my ($status,@cmd);

    my ($tmpfile, $contref, $weighted_str, $headings, $fields)
      = @_;

    util::vprint("Processing chm file ... (using  '$archmagepath')\n");


    my $tmpfile2 = util::tmpnam('NMZ.chm_dir');
    my $tmpfile3 = util::tmpnam('NMZ.chm_stdout');
    my $tmpfile4 = util::tmpnam('NMZ.chm_stderr');
    # as opposed to clit, archmage does not want a dir
    # mkdir($tmpfile2);
    @cmd = ("$archmagepath", "$tmpfile","$tmpfile2");
    util::vprint("starting archmage");
    system("rm","-rf","$tmpfile2");
    $status = util::syscmd(
        command => \@cmd,
        option => {
            "stdout" => $tmpfile3,
            "stderr" => $tmpfile4,
            #"stderr" => "/dev/null",
        },
    );
    util::vprint("archmage output:");
    my ($in,$infile);
    for $infile ($tmpfile3,$tmpfile4) {
	    open I,"<$infile";
	    while ($in=<I>) {
	    	util::vprint($in);
	    }
	    close I;
    }
    if ($status == 0) {
	my $summary = util::readfile("$tmpfile3");
        # codeconv::toeuc(\$summary);
        codeconv::codeconv_document(\$summary);
	#$$contref .= $summary . " ";
    } else {
        unlink($tmpfile);
        unlink($tmpfile3);
        unlink($tmpfile4);
	system("rm","-rf","$tmpfile2");
        return 'Unable to convert chm file (maybe copying protection)';
    }

    unlink($tmpfile3);
    unlink($tmpfile4);

    my ($fname,$dname,@dirs);
    @dirs="$tmpfile2";
    while ($dname=pop(@dirs)) {
	    util::vprint("traversing $dname");
	    opendir DIR,"$dname";
	    foreach $fname (readdir(DIR)){
		    if ("$fname" =~ /^\.|\.\.$/) {
		    	next;
		    }
		    $fname="$dname/$fname";
		    if ( -d $fname) {
		    	push @dirs,"$fname";
		    } else {

			    stat $fname;
			    my $size = [stat($fname)]->[7];
			    if ($size == 0) {
				    util::dprint("$fname: filesize is 0");
			    } elsif ($size > $conf::FILE_SIZE_MAX) {
				    util::dprint("$fname: Too large chm file");
			    } elsif ($fname =~ m!^($conf::DENY_FILE)$!i ) {
# codeconv::toeuc(\$fname);
				    codeconv::codeconv_document(\$fname);
				    util::vprint(sprintf(_("Denied:	%s"), $fname));
			    } elsif ($fname !~ m!^($conf::ALLOW_FILE)$!i) {
# codeconv::toeuc(\$fname);
				    codeconv::codeconv_document(\$fname);
				    util::vprint(sprintf(_("Not allowed:	%s"), $fname));
			    } else {
				    my $con = "";
				    util::vprint("processing $fname");
				    my $err = chm::nesting_filter($fname, \$con, $weighted_str);
				    if (defined $err) {
					    util::dprint("filter/chm.pl gets error message \"$err\"");
				    }
				    $$contref .= $con . " ";
			    }
		    }
	    };
	    closedir DIR;
	    chdir "..";
    }
    system("rm","-rf","$tmpfile2");
    return undef;
}

sub nesting_filter ($$$){
    my ($filename, $contref, $weighted_str) = @_;
    my $err = undef;
    my $dummy_shelterfname = "";
    my $headings = "";
    my %fields;
    my $mmtype = undef;

    my ($kanji, $mtype) = mknmz::apply_filter(\$filename, $contref, 
			$weighted_str, \$headings, \%fields, 
			$dummy_shelterfname, $mmtype);

    if ($mtype =~ /; x-system=unsupported$/){
	$$contref = "";
        $err = $mtype;
    }elsif ($mtype =~ /; x-error=(.*)$/){
        $$contref = "";
        $err = $1;
    }else{
	gfilter::show_filter_debug_info($contref, $weighted_str,
					\%fields, \$headings);
	for my $field (keys %fields) {
	    $$contref .= " ". $fields{$field};
	}
	$$contref .= util::readfile("$filename");
    }
    return $err;
}

1;