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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;
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