File Coverage

blib/lib/HTML/HTMLDoc.pm

Criterion	Covered	Total	%
statement	20	466	4.2
branch	0	114	0.0
condition	0	82	0.0
subroutine	7	71	9.8
pod	50	51	98.0
total	77	784	9.8

package HTML::HTMLDoc;

use 5.006;
use strict;
use warnings;
use IO::File;
use IPC::Open3 qw();
use HTML::HTMLDoc::PDF;
use vars qw(@ISA $VERSION);

@ISA = qw();
$VERSION = '0.15';
my $DEBUG = 0;

###############
# create a new Object
# param:
# return: object:HTML::HTMLDOC
###############
sub new {
	my $package = shift;

	my $self = {};
	bless($self, $package);

	while (my $key = shift) {
		my $value = shift;
		$self->{'config'}->{$key} = $value;
	}

	$self->_init();

	return $self;
}

###############
# initialises the Object with the basic parameters
# param: -
# return: -
###############
sub _init {
	my $self = shift;

	if ((not defined $self->{'config'}->{'mode'}) || ($self->{'config'}->{'mode'} ne 'file' && $self->{'config'}->{'mode'} ne 'ipc')) {
		$self->{'config'}->{'mode'} = 'ipc';
	}

	if ( (!$self->{'config'}->{'tmpdir'}) || (!-d $self->{'config'}->{'tmpdir'})) {
		$self->{'config'}->{'tmpdir'} = '/tmp';
	}

	if ( defined($self->{'config'}->{'bindir'}) ) {
		$self->{'config'}->{'bindir'} .= "/" if ( $self->{'config'}->{'bindir'} !~ /\/$/ );
	} else {
		$self->{'config'}->{'bindir'} = '';
	}

	$self->{'errors'} = [];
	$self->{'doc_config'} = {};

	$self->set_page_size('universal');
	$self->portrait();
	$self->set_charset('iso-8859-1');
	$self->_set_doc_config('quiet');
	$self->set_output_format('pdf');

	# standard-header and footer
	$self->set_footer('.', '1', '.');
	$self->set_header('.', 't', '.');

}

###############
# Store or get a global configuration value
# testet
# param: key:STRING, value:STRING
# return: 1
###############
sub _config {
	my $self = shift;
	my $key = shift;
	my $value = shift;

	my $ret;
	if (defined $value) {
		$self->{'config'}->{$key} = $value;
	} else {
		$ret = $self->{'config'}->{$key};
	}
	return $ret;
}

###############
# stores a specific value for formating the outputdoc
# testet
# param: key:STRING, value:STRING
# return: 1
###############
sub _set_doc_config {
	my $self = shift;
	my $key = shift;
	my $value = shift;

	if (ref($value) && (ref($value) eq 'ARRAY') ) {
		# the value is an array, store it in an array too
		if ( !$self->{'doc_config'}->{$key} || ref($self->{'doc_config'}->{$key}) ne 'ARRAY') {
			# create a new array
			$self->{'doc_config'}->{$key} = [];
		}
		foreach my $single_value(@{$value}) {
			push(@{$self->{'doc_config'}->{$key}}, $single_value);
		}
	} else {
		$self->{'doc_config'}->{$key} = $value;
	}

	return 1;
}

###############
# deletes a specific config
# testet
# param: key:STRING
# return: value:STRING
###############
sub _delete_doc_config {
	my $self = shift;
	my $key = shift;
	my $value = shift;

	if (exists $self->{'doc_config'}->{$key}) {
		my $set_value = $self->_get_doc_config($key);
		if ( (ref($set_value) eq 'ARRAY') && $value ) {
			# remove specific value only
			# find the position of the value
			for(my $i=0; $i<@{$set_value}; $i++) {
				if ( $set_value->[$i] eq $value ) {
					splice(@{$set_value}, $i, 1);
					last;
				}
			}
		} else {
			# delete the singlevalue
			delete $self->{'doc_config'}->{$key};
		}
	}
}


###############
# tells a specific value for formating the outputdoc
# testet
# param: key:STRING
# return: value:STRING
###############
sub _get_doc_config {
	my $self = shift;
	my $key = shift;
	return $self->{'doc_config'}->{$key};
}

###############
# returns all the configuration keys
# param: key:STRING
# return: value:STRING
###############
sub _get_doc_config_keys {
	my $self = shift;

	my @keys = keys %{$self->{'doc_config'}};
	print STDERR "Keys: @keys\n" if $DEBUG;
	return @keys;
}

###############
# tests if the parameter exists in the array
# of allowed params
# testet
# param: key:STRING, \@allowed
# return: 1/0
###############
sub _test_params {
	my $self = shift;
	my $param = shift;
	my $allowed = shift;

	my $ok = 0;
	foreach my $aparam (@{$allowed}) {
		if (lc($param) eq lc($aparam)) {
			$ok=1;
			last;
		}
	}

	return $ok;
}


#######################################
# 			public Methods for configuring behaviour and style of the
#			Document
#######################################

###############
# sets the size of the pages - default: a4
# testet
# param: letter, a4, WxH{in,cm,mm}
# return: 1/0
###############
sub set_page_size {
	my $self = shift;
	my $value = shift;

	if ( !$value && $value ne 'a4' && $value ne 'letter' && $value ne 'universal' && $value!~/^\d+x\d+(?:in|cm|mm)/ ) {
		$self->error("unknown value for pagesize: $value");
		return 0;
	}

	$self->_set_doc_config('size', $value);
    return 1;
}

###############
# reads out the page-size
# param: letter, a4, WxH{in,cm,mm}
# return: 1/0
###############
sub get_page_size {
	my $self = shift;
	return $self->_get_doc_config('size');
}

###############
# sets the master-password of the doc
# testet
# param: password:STRING
# return: 1/0
###############
sub set_owner_password {
	my $self = shift;
	my $value = shift;
	$self->_set_doc_config('owner-password', $value);
	return 1;
}

###############
# sets the user-password of the doc
# testet
# param: password:STRING
# return: 1/0
###############
sub set_user_password {
	my $self = shift;
	my $value = shift;
	$self->_set_doc_config('user-password', $value);
	return 1;
}

# all,annotate,copy,modify,print,no-annotate,no-copy,no-modify,no-print,none
###############
# sets the master-password of the doc
# testet
# param: password:STRING
# return: 1/0
###############
sub set_permissions {
	my $self = shift;
	my @values = @_;

	my $thiskey = 'permissions';

	my @allowed = ('all','annotate','copy','modify','print','no-annotate','no-copy','no-modify','no-print','none');
	# test the set value
	if ($#values==-1) {
		$self->error("wrong permission set: no values");
		return 0;
	}
	for( my $i=0; $i<=$#values; $i++ ) {
		$values[$i] = lc($values[$i]);
		if ( !$self->_test_params($values[$i], \@allowed) ) {
			# wrong permission set
			$self->error("wrong permission set: $values[$i]");
			return 0;
		}
	}

	foreach my $value(@values) {
		# take care of the combination of the options
		if ( $value eq 'all' ) {
			# delete all
			$self->_delete_doc_config($thiskey);
		} elsif( $value eq 'none' ) {
			# delete all
			$self->_delete_doc_config($thiskey);
		} else {
			# delete the corresponding flag
			if ( $value =~/^no-(.+)/ ) {
				my $key = $1;
				$self->_delete_doc_config($thiskey, $key);
			} else {
				$self->_delete_doc_config($thiskey, "no-$value");
			}
		}

		$self->_set_doc_config('permissions', [$value]);
	}
	# enable encryption since without it there is no effect.
	$self->enable_encryption();
	return 1;
}

###############
# sets to duplex for two-sided printing
# testet
# param: -
# return: 1/0
###############
sub duplex_on {
	my $self = shift;

	$self->_set_doc_config('duplex', '');
	$self->_delete_doc_config('no-duplex');
	return 1;
}

###############
# disable duplex / two-sided printing
# testet
# param: -
# return: 1/0
###############
sub duplex_off {
	my $self = shift;

	$self->_set_doc_config('no-duplex', '');
	$self->_delete_doc_config('duplex');
	return 1;
}

###############
# sets the pages to portrait
# testet
# param: -
# return: 1/0
###############
sub landscape {
	my $self = shift;

	$self->_set_doc_config('landscape', '');
	$self->_delete_doc_config('portrait');
	return 1;
}

###############
# sets the pages to portrait
# testet
# param: -
# return: 1/0
###############
sub portrait {
	my $self = shift;

	$self->_set_doc_config('portrait', '');
	$self->_delete_doc_config('landscape');
	return 1;
}

###############
# turns the title on
# param: -
# return: 1/0
###############
sub title {
	my $self = shift;

	$self->_set_doc_config('title', '');
	$self->_delete_doc_config('no-title');
	return 1;
}

###############
# turns the title off
# param: -
# return: 1/0
###############
sub no_title {
	my $self = shift;

	$self->_set_doc_config('no-title', '');
	$self->_delete_doc_config('title');
	return 1;
}

###############
# sets the footer
# testet
# param: left:CHAR, center:CHAR, right:CHAR
# return: 1/0
###############
sub set_footer {
	my $self = shift;
	my $left = shift;
	my $center = shift;
	my $right = shift;

	my @allowed = ('.', ':', '/', '1', 'a', 'A', 'c', 'C', 'd', 'D', 'h', 'i', 'I', 'l', 't', 'T','u');
	if (!$self->_test_params($left, \@allowed) ) {
		$self->error("wrong left-footer-option: $left");
		return 0;
	}
	if (!$self->_test_params($center, \@allowed) ) {
		$self->error("wrong center-footer-option: $left");
		return 0;
	}
	if (!$self->_test_params($right, \@allowed) ) {
		$self->error("wrong right-footer-option: $left");
		return 0;
	}

	$self->_set_doc_config('footer', "${left}${center}${right}");

	return 1;
}

###############
# sets the header
# testet
# param: left:CHAR, center:CHAR, right:CHAR
# return: 1/0
###############
sub set_header {
	my $self = shift;
	my $left = shift;
	my $center = shift;
	my $right = shift;

	my @allowed = ('.', ':', '/', '1', 'a', 'A', 'c', 'C', 'd', 'D', 'h', 'i', 'I', 'l','L', 't', 'T','u');
	if (!$self->_test_params($left, \@allowed) ) {
		$self->error("wrong left-header-option: $left");
		return 0;
	}
	if (!$self->_test_params($center, \@allowed) ) {
		$self->error("wrong center-header-option: $left");
		return 0;
	}
	if (!$self->_test_params($right, \@allowed) ) {
		$self->error("wrong right-header-option: $left");
		return 0;
	}

	$self->_set_doc_config('header', "${left}${center}${right}");

	return 1;
}

###############
# turns the links on
# param: -
# return: 1/0
###############
sub links {
	my $self = shift;

	$self->_set_doc_config('links', '');
	$self->_delete_doc_config('no-links');
	return 1;
}

###############
# turns the links off
# param: -
# return: 1/0
###############
sub no_links {
	my $self = shift;

	$self->_set_doc_config('no-links', '');
	$self->_delete_doc_config('links');
	return 1;
}

###############
# sets the search path for files in a document
# param: -
# return: 1/0
###############
sub path {
	my $self = shift;
    my $sp = shift;

	$self->_set_doc_config('path', $sp);
	return 1;
}

###############
# sets the right margin
# testet
# param: margin|NUM, messure:in,cm,mm
# return: 1/0
###############
sub set_right_margin {
	my $self = shift;
	my $margin = shift;
	my $m = shift || 'cm';
	return $self->_set_margin('right', $margin, $m);
}

###############
# sets the left margin
# testet
# param: margin|NUM, messure:in,cm,mm
# return: 1/0
###############
sub set_left_margin {
	my $self = shift;
	my $margin = shift;
	my $m = shift || 'cm';
	return $self->_set_margin('left', $margin, $m);
}

###############
# sets the bottom margin
# param: margin|NUM, messure:in,cm,mm
# return: 1/0
###############
sub set_bottom_margin {
	my $self = shift;
	my $margin = shift;
	my $m = shift || 'cm';
	return $self->_set_margin('bottom', $margin, $m);
}

###############
# sets the top margin
# param: margin|NUM, messure:in,cm,mm
# return: 1/0
###############
sub set_top_margin {
	my $self = shift;
	my $margin = shift;
	my $m = shift || 'cm';
	return $self->_set_margin('top', $margin, $m);
}


sub _set_margin {
	my $self = shift;
	my $where = shift;
	my $margin = shift;
	my $m = shift;

	# test the values
	if ( $margin!~/^\d*\.?\d+$/ || ( ($m ne 'in') && ($m ne 'cm') && ($m ne 'mm') )) {
		$self->error("wrong arguments for $where-margin: $margin $m");
		return 0;
	}

	$self->_set_doc_config($where, "$margin$m");
	return 1;
}

###############
# sets the color of the body
# testet
# param: color:hex
# return: 1/0
###############
sub set_bodycolor {
	my $self = shift;

	my $ret;
	my $color = $self->_test_color(@_);
	if (!$color) {
		$self->error("wrong value set for bodycolor");
		$ret = 0;
	} else {
		$ret = $self->_set_doc_config('bodycolor', $color);
	}

	return $ret;
}

###############
# internal method for testing and converting colors
# testet
# param: color:hex || color: rgb || color: name
# return: color:hex
###############
sub _test_color {
	my $self = shift;
	my @colors = @_;
	my $ret;

	if( (@colors == 1) && $colors[0]=~/^#[0-9a-f]{6}$/i ) {
		# got hex-color
		return $colors[0];
	} elsif( @colors==3 ) {
		# 3 input values, test if regular rgb is given
		my ($r, $g, $b) = @colors;
		if ($r=~/^\d{1,3}$/ && $g=~/^\d{1,3}$/ && $b=~/^\d{1,3}$/
			&& $r>=0 && $r <=255 && $b>=0 && $b<=255 && $g>=0 && $g<=255) {
				$ret = sprintf("#%02x%02x%02x", $r, $g, $b);
		}
	} elsif( @colors==1 ) {
		foreach my $c( qw(red green blue cyan magenta yellow darkRed
			darkGreen darkBlue darkCyan darkMagenta darkYellow white
			lightGray gray darkGray black) ) {
				if ($c eq $colors[0]) {
					$ret = $c;
					last;
				}
			}
	}

	return $ret;
}

###############
# sets the default font for the body
# testet
# param: fontface:STRING
# return: 1/0
###############
sub set_bodyfont {
	my $self = shift;
	my $font = shift;

	my $ret = 0;
	my @allowed = qw(Arial Courier Helvetica Monospace Sans Serif Times);
	if ( !$self->_test_params($font, \@allowed) ) {
		$self->error("illegal font set $font");
	} else {
		$self->_set_doc_config('bodyfont', $font);
		$ret = 1;
	}

	return $ret;
}

###############
# sets the default font for the document
# testet
# param: fontface:STRING
# return: 1/0
###############
sub set_textfont {
	my $self = shift;
	my $font = shift;

	my $ret = 0;
	my @allowed = qw(Arial Courier Helvetica Monospace Sans Serif Times);
	if ( !$self->_test_params($font, \@allowed) ) {
		$self->error("illegal font set $font");
	} else {
		$self->_set_doc_config('textfont', $font);
		$ret = 1;
	}

	return $ret;
}

###############
# sets the font size for body text
# param: size:NUM
# return: 1/0
###############
sub set_fontsize {
	my $self = shift;
	my $fsize = shift;
	if ($fsize =~ /^\d+(\.\d+){0,1}$/) {
		return $self->_set_doc_config('fontsize', $fsize);
	} else {
		$self->error("illegal font size $fsize");
		return 0;
	}
}


###############
# takes an image-filename that is used as background
# for all Pages
# param: image:STRING
# return: 1/0
###############
sub set_bodyimage {
	my $self = shift;
	my $image = shift;

	if ( ! -f "$image" ) {
		$self->error("Backgroundimage $image could not be found");
		return 0;
	}

	$self->_set_doc_config('bodyimage', $image);
	return 1;
}

###############
# takes an image-filename that is used as logoimage
# param: image:STRING
# return: 1/0
###############
sub set_logoimage {
	my $self = shift;
	my $image = shift;

	if ( ! -f "$image" ) {
		$self->error("Logoimage $image could not be found");
		return 0;
	}

	$self->_set_doc_config('logoimage', $image);
	return 1;
}

###############
# returns a previous set logo-image
# param: -
# return: image:STRING
###############
sub get_logoimage {
	my $self = shift;
	return $self->_get_doc_config('logoimage');
}

###############
# takes an image-filename that is used as letterhead
# param: image:STRING
# return: 1/0
###############
sub set_letterhead {
	my $self = shift;
	my $image = shift;

	if ( ! -f "$image" ) {
		$self->error("Letterhead $image could not be found");
		return 0;
	}

	$self->_set_doc_config('letterhead', $image);

	# tell htmldoc to use this letterhead
	$self->set_header('.', 'L', '.');

	return 1;
}

###############
# returns a previous set letterhead image
# param: -
# return: image:STRING
###############
sub get_letterhead {
	my $self = shift;
	return $self->_get_doc_config('letterhead');
}


###############
# set the witdh in px for the background image
# param: width:INT
# return: 1/0
###############
sub set_browserwidth {
	my $self = shift;
	my $width = shift;

	if ($width !~ /^\d+$/) {
		$self->error("wrong browserwidth $width set");
		return 0;
	}

	$self->_set_doc_config('browserwidth', $width);
	return 1;
}

###############
# sets the compression level
# param:
# return: 1/0
###############
sub set_compression {
	my $self = shift;
	my $comp = shift;
	return $self->_set_doc_config('compression', $comp);
}

###############
# sets the JPEG-Kompression
# param: 0-100 (default 50)
# return: 1/0
###############
sub set_jpeg_compression {
	my $self = shift;
	my $comp = shift;
	$comp = 75 if (not defined $comp);
	return $self->_set_doc_config('jpeg', $comp);
}

###############
# sets the JPEG-Kompression value to the highest quality
# param: -
# return: 1/0
###############
sub best_image_quality {
	my $self = shift;
	return $self->set_jpeg_compression(100);
}

###############
# sets the JPEG-Kompression value to the highest quality
# param: -
# return: 1/0
###############
sub low_image_quality {
	my $self = shift;
	return $self->set_jpeg_compression(25);
}

###############
# sets the pagemode
# param: mode:[document,outline,fullscreen]
# return: 1/0
###############
sub set_pagemode {
	my $self = shift;
	my $value = shift;

	#--pagemode {document,outline,fullscreen}
	if (!$self->_test_params($value, ['document', 'outline', 'fullscreen']) ) {
    #if ($value ne 'document' && $value ne 'outline' && $value ne 'fullscreen') {
		$self->error("wrong pagemode: $value");
		return 0;
	}

	$self->_set_doc_config('pagemode', $value);
}

###############
# sets the page layout when opened in the viewer
# param: mode:[single,one,twoleft,tworight]
# return: 1/0
###############
sub set_pagelayout {
	my $self = shift;
	my $value = shift;

	#--pagemode {document,outline,fullscreen}
	if (!$self->_test_params($value, ['single', 'one', 'twoleft', 'tworight']) ) {
    #if ($value ne 'document' && $value ne 'outline' && $value ne 'fullscreen') {
		$self->error("wrong pagelayout: $value");
		return 0;
	}

	$self->_set_doc_config('pagelayout', $value);
}



###############
# sets the charset
# param: charset
# return: 1/0
###############
sub set_charset {
	my $self = shift;
	my $charset = shift;

	$self->_set_doc_config('charset', $charset);
	return 1;
}

###############
# embedding the used fonts into the pdf-file
# testet
# param:
# return: 1/0
###############
sub embed_fonts {
	my $self = shift;
	$self->_delete_doc_config('no-embedfonts');
	$self->_set_doc_config('embedfonts', '');
	return 1;
}

###############
# no font embedding
# testet
# param:
# return: 1/0
###############
sub no_embed_fonts {
	my $self = shift;
	$self->_delete_doc_config('embedfonts');
	$self->_set_doc_config('no-embedfonts', '');
	return 1;
}

###############
# turns colors on in doc
# param: charset
# return: 1/0
###############
sub color_on {
	my $self = shift;

	$self->_set_doc_config('color', '');
	$self->_delete_doc_config('grey', '');
	return 1;
}

###############
# turns colors off in doc
# param:
# return: 1/0
###############
sub color_off {
	my $self = shift;

	$self->_set_doc_config('grey', '');
	$self->_delete_doc_config('color', '');
	return 1;
}

###############
# turns encryption off
# param: -
# return: 1/0
###############
sub enable_encryption {
	my $self = shift;

	$self->_set_doc_config('encryption', '');
	$self->_delete_doc_config('no-enryption', '');
	return 1;
}

###############
# turns encryption off
# param: -
# return: 1/0
###############
sub disable_encryption {
	my $self = shift;

	$self->_set_doc_config('no-encryption', '');
	$self->_delete_doc_config('enryption', '');
	return 1;
}

###############
# sets the outputformat of the document
# param: format:STRING
# return: 1/0
###############
sub set_output_format {
	my $self = shift;
	my $f = shift;

	my @allowed = qw(epub html pdf pdf11 pdf12 pdf13 pdf14 ps ps1 ps2 ps3);
	if( !$self->_test_params($f, \@allowed)) {
		$self->error("Wrong output format set $f");
		return 0;
	}

	$self->_set_doc_config('format', $f);
	return 1;
}


####################################################
#
# 			Methods for outputting the result
#
####################################################



###############
# sets the html-page that should be rendered
# param: html:STRING
# return: 1/0
###############
sub set_html_content {
	my $self = shift;
	my $html = shift;

	$self->{'html'} = $html;
	return 1;
}

###############
# returns the html-content
# param: -
# return: html:STRING
###############
sub get_html_content {
	my $self = shift;

	if (ref($self->{'html'}) eq 'SCALAR') {
		return ${$self->{'html'}};
	}

	return $self->{'html'};
}

###############
# sets the filename of the html-page that should be rendered
# param: input_file:STRING
# return: 1/0
###############
sub set_input_file {
	my $self = shift;
	my $infile = shift;

    if (-f $infile) {
        $self->{'input_file'} = $infile;
        $self->{'config'}->{'mode'} = 'file';
        return 1;
    }
    return 0;
}

###############
# returns the input htmlfile
# param: -
# return: input_file:STRING
###############
sub get_input_file {
	my $self = shift;
	return $self->{'input_file'};
}


###############
# private: opens a temporary file and sets the
# html-content in
# param: -
# return: filename:STRING
###############
sub _prepare_input_file {
	my $self = shift;

	my $i=0;
	my $filename;
	return $filename if (defined ($filename = $self->{'input_file'}));

	while($i<1000) {
		my $randpart = int(rand(1000));
		$filename = $self->{'config'}->{'tmpdir'} . "/htmldoc$randpart.html";

		if (-f $filename) {
			$i++;
			next;
		} else {
			last;
		}
	}

	my $file = new IO::File($filename, 'w');
	if (!$file) {
		warn "could not open tempfile $!";
		return undef;
	}
	$file->print($self->get_html_content());
	$file->close();
	$self->{'config'}->{'tmpfile'} = $filename;

	return $filename;
}

###############
# private: cleans up, deletes the tempfile
# param: -
# return: -
###############
sub _cleanup {
	my $self = shift;
	unlink($self->{'config'}->{'tmpfile'})
		if ( (defined $self->{'config'}->{'tmpfile'}) && (-f $self->{'config'}->{'tmpfile'}) );
}

###############
# finaly produces the pdf-output
# param: -
# return: pdf:STRING
###############
sub generate_pdf {
	my $self = shift;

	# save the env-var for restoring it later
	my $old_htmldoc_env = $ENV{'HTMLDOC_NOCGI'};
	$ENV{'HTMLDOC_NOCGI'} = 'yes';

	my $params = $self->_build_parameters();
	my $pdf;

	#if ($self->{'config'}->{'mode'} eq 'ipc') {
	if ($self->_config('mode') eq 'ipc') {
		# we are in normale Mode, use IPC
		my ($pid, $error);
    	($pid,$pdf,$error) = $self->_run($self->{'config'}->{'bindir'}."htmldoc  $params --webpage -", $self->get_html_content());
	} else {
		# we are in file-mode
		my $filename = $self->_prepare_input_file();
		return undef if (!$filename);
		$pdf = `$self->{'config'}->{'bindir'}htmldoc $params --webpage $filename`;
    	$self->_cleanup();
	}

	# restore old value
	if (not defined $old_htmldoc_env) {
		delete $ENV{'HTMLDOC_NOCGI'};
	} else {
		$ENV{'HTMLDOC_NOCGI'} = $old_htmldoc_env;
	}

	my $doc = new HTML::HTMLDoc::PDF(\$pdf);

	return $doc;
}

###############
# generates a string for the configuration of htmldoc
# testet
# param: -
# return: params:STRING
###############
sub _build_parameters {
	my $self = shift;

	my $paramstring='';

	foreach my $key($self->_get_doc_config_keys()) {
		my $value = $self->_get_doc_config($key) || '';
		if ( ref($value) eq 'ARRAY' ) {
			# an array, set the option multiple
			foreach my $single_v(@{$value}) {
				$paramstring .= " --$key $single_v";
			}
		} else {
			if ($key eq 'compression' || $key eq 'jpeg') {
				$paramstring .= " --$key=$value";
			} else {
				$paramstring .= " --$key $value";
			}
		}

	}

	return $paramstring;
}

sub _run {
	my $self = shift;
	my $command = shift;
	my $input = shift;

	# create new Filehandles
	my ($stdin,$stdout,$stderr) = (IO::Handle->new(),IO::Handle->new(),IO::Handle->new());
	my $pid = IPC::Open3::open3($stdin,$stdout,$stderr, $command);
	if (!$pid) {
		$self->error("Cannot fork [COMMAND: '$command'].");
		return (0);
	}

	print $stdin $input;
	close $stdin;

	my $output = join('',<$stdout>);
	close $stdout;

	my $error = join('',<$stderr>);
	close $stderr;

	wait();


	if ($DEBUG) {
		print STDERR "\n********************************************************************\n";
		print STDERR "COMMAND : \n$command [PID $pid]\n";
		print STDERR "STDIN  :  \n$input\n";
		print STDERR "STDOUT :  \n$output\n";
		print STDERR "STDERR :  \n$error\n";
		print STDERR "\n********************************************************************\n";
	}

	return($pid,$output,$error);
}


###############
# set or retrieve an occurred error
# param: -
# return: pdf:STRING
###############
sub error {
	my $self = shift;
	my $error = shift;

	if (defined $error) {
		push(@{$self->{'errors'}}, $error);
	} else {
		if (wantarray()) {
			return @{$self->{'errors'}};
		} else {
			return $self->{'errors'}->[0];
		}
	}
}

1;
__END__