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+#!/usr/bin/perl -w
+# pdftops.pl - wrapper script for xpdf's pdftops utility to act as a CUPS filter
+# ==============================================================================
+# 1.00 - 2004-10-05/Bl
+#	Initial implementation
+#
+# Copyright: Helge Blischke / SRZ Berlin 2004
+# This program is free seoftware and governed by the GNU Public License Version 2.
+#
+# Description:
+# ------------
+#	This program wraps the pdftops utility from the xpdf 3.00 (and higher) suite
+#	to behave as a CUPS filter as a replacement for the original pdftops filter.
+#
+#	The main purpose of this approach is to keep the properties of a PDF to be
+#	printed as undesturbed as possible, especially with respect to page size,
+#	scaling, and positioning.
+#
+#	The pdftops utility reads a configuration file 'pdftops.conf' in the 
+#	CUPS_SERVERROOT directory, which must exist but may be empty. The sample
+#	configuration file accompanying this program sets the defaults which
+#	seem plausible to me with respect to high end production printers.
+#
+#	To give the user highest possible flexibility, this program accepts and
+#	evaluates a set of job attributes special to this filter, which are 
+#	described below:
+#	
+#		pdf-pages=<f>,<l>
+#				expands to the -f and -l options of pdftops
+#				to select a page range to process. This is independent
+#				of the page-ranges attribute and may significantly
+#				increase throughput when printing page ranges.
+#				Either of these numbers may be omitted.
+#
+#		pdf-paper=<name>
+#		pdf-paper=<width>x<height>
+#				<name> may be one of letter, legal , A4, A3, or match;
+#				<width> and <height> are the paper width and height
+#				in printers points (1/72 inch). This expands to
+#				either the -paper or the -paperh and -paperw options
+#				of pdftops
+#
+#		pdf-opw=<password>
+#		pdf-upw=<password>
+#				expand to the -opw and -upw options of pdftops,
+#				respectively and permit printing of password
+#				protected PDFs.
+#
+#		pdf-<option>	where <option> is one of
+#				level1, level1sep, level2, level2sep, level3, level3sep,
+#				opi, nocrop, expand, noshrink, nocenter.
+#				See the pdftops manpage for a detailed description of
+#				the respective options.
+#
+#	All other pdftops commandline options are refused.
+#
+#	When printing from STDIN, the program copies the input to a temporary file
+#	in TMPDIR, which is deleted on exit.
+#
+#	The return code of the pdftops utility, if nonzero, is used as the exit code
+#	of this program; error messages of the pdftops utility are only visible
+#	if 'debug' is specified as LogLevel in cupsd.conf.
+
+#
+# Site specific parameters - modify as needed
+# ------------------------------------------------------------------------------
+$pdftops_path = "/usr/bin/pdftops";	# path to the xpdf utility
+# ------------------------------------------------------------------------------
+
+use File::Copy;
+
+#
+# Check the arguments
+#
+die ("ERROR: wrong number of arguments\n") if (scalar @ARGV < 5);
+
+$jobid = $username = $title = $copies = undef;
+$jobid = shift;					# Job ID
+$username = shift;				# Job requesting user name
+$title = shift;					# Job title
+$copies = shift;				# Number of requested copies
+$options = shift;				# Textual representation of job attributes
+$pdffile = shift;				# Pathname of PDF file to process
+
+# If we are reading from STDIN, we must copy the input to a temporary file
+# as the PDF consumer needs a seekable input.
+
+if (! defined $pdffile)
+{
+	my $tmpfile = $ENV{TMPDIR} . "pdfin.$$.tmp";
+	open (TEMP, ">$tmpfile") || die ("ERROR: pdftops wrapper: $tmpfile: $!\n");
+	if (! copy (STDIN, TEMP))
+	{
+		close (TEMP);
+		unlink $tmpfile;
+		die ("ERROR: pdftops wrapper: $tmpfile: $!\n");
+	}
+	close (TEMP);
+	$pdffile = $tmpfile;
+	$delete_input = 1;			# for deleting the temp file after converting
+}
+
+# 
+# Check the options string for options to modify the bahaviour of the pdftops utility:
+#
+@optarr = split (/\s+/, $options);
+$cmdopt = "-cfg " . $ENV{CUPS_SERVERROOT} . "/pdftops.conf";	# This cannot be changed
+# The following are the (parameterless) command line options that may be used to change the 
+# defaults defiend by pdftops.conf
+$simple = 'level1|level1sep|level2|level2sep|level3|level3sep|opi|nocrop|expand|noshrink|nocenter';
+foreach my $option (@optarr)
+{
+	if ($option =~ /^pdf-(.+)$/)
+	{	# We assume this is an option to evaluate
+		my $optkey = $1;		# possible pdftops option
+		if ($optkey =~ /^pages=(\d*),(\d*)$/)
+		{
+			# We do this hack here to avoid clashes with the page-ranges atrribute
+			# which is handled by the pstops filter. And we allow one of the numbers
+			# to be omitted.
+			my $first = $1;
+			my $lastp = $2;
+			$cmdopt .= " -f $1" if ($1);		# first page
+			$cmdopt .= " -l $2" if ($2);		# last page
+		}
+		elsif ($optkey =~ /^paper=(letter|legal|A4|A3|match)$/)
+		{
+			$cmdopt .= " -paper $1";			# paper name
+		}
+		elsif ($optkey =~ /^paper=(\d+)x(\d+)$/)
+		{
+			$cmdopt .= " -paperw $1 -paperh $2";		# paper dimensions
+		}
+		elsif ($optkey =~ /^(o|u)pw=(\S+)$/)
+		{
+			$cmdopt .= " $1" . 'pw ' . $2;			# owner/user password
+		}
+		elsif ($optkey =~ /^($simple)$/)
+		{
+			$cmdopt .= ' -' . $1;				# allowed simple options
+		}
+		else
+		{
+			warn ("ERROR: pdftops wrapper: illegal attribute \"pdf-$optkey\"\n");
+		}
+	}
+	# All other attributes are processed elsewhere
+}
+#
+# Complete the command
+#
+warn ("ERROR: pdftops-options: $cmdopt\n");
+$rc = system ("$pdftops_path $cmdopt $pdffile -");
+if ($rc)
+{
+	$ir = $rc & 127;
+	$rc >>= 8;
+	warn ("ERROR: pdftops_path exited with ", ($ir) ? "signal $ir, " : " exit code $rc", "\n");
+	exit $rc;
+}
+unlink ($pdffile) if (defined $delete_input);		# Delete the temp file if any
+exit 0;