#!/bin/sh

# $Id: pstopdf,v 1.3 2003/02/15 15:21:00 gurubert Exp $
#
# This is a Postscript to PDF filter for CUPS
#
# (C) 2003 Robert Sander <robert.sander@epigenomics.com>
#
# Released under GPL
#
# NO WARRANTY AT ALL
#

set -e

PS2PS=/usr/bin/ps2ps
PS2PDF=/usr/bin/ps2pdf13
PS2PS_OPTIONS="-dAutoRotatePages=/None -dAutoFilterColorImages=false \
               -dNOPLATFONTS -dPARANOIDSAFER -sstdout=%stderr"
PS2PDF_OPTIONS="$PS2PS_OPTIONS -dColorImageFilter=/FlateEncode \
               -dPDFSETTINGS=/printer"

echo "DEBUG: pstopdf argv[$#] = $@" >&2
echo "DEBUG: PPD: $PPD" >&2

if [ $# -lt 5 -o $# -gt 6 ]; then

  echo "ERROR: $0 job-id user title copies options [file]" >&2
  exit 1

fi

# Read from given file.
if [ -n "$6" ]; then
  exec <"$6"
fi

tempfiles=
trap 'rm -f $tempfiles' 0 1 2 13 15

infile=$(mktemp -t pstopdf.XXXXXX)
tempfiles="$tempfiles $infile"

cat >"$infile"

# Apply PPD settings.

resolution=
eval "$(printf "%s" "$5" | sed -nre 's/.*(^|\s)Resolution=([0-9.]+(x[0-9.]+)?).*/resolution="${resolution:-\2}"/p')"
if test -e "$PPD"; then
  eval "$(sed -nre 's/^\*DefaultResolution:\s+([0-9.]+(x[0-9.]+)?).*/resolution="${resolution:-\1}"/p' "$PPD")"
fi
echo "DEBUG: Resolution: $resolution" >&2

pagesize=
eval "$(printf "%s" "$5" | sed -nre 's/.*(^|\s)(media|PageSize)=(\S+).*/pagesize="${pagesize:-\3}"/p')"
if test -e "$PPD"; then
  eval "$(sed -nre 's/^\*DefaultPageSize:\s+(\S+).*/pagesize="${pagesize:-\1}"/p' "$PPD")"
fi
echo "DEBUG: Page size: $pagesize" >&2

width=
height=
bl_x=
bl_y=
tr_x=
tr_y=
if test -n "$pagesize" && test -e "$PPD"; then
  eval "$(sed -nre 's|^\*PaperDimension\s+'"$pagesize"'/[^:]+:\s+"(\S+)\s+(\S+)".*|width="\1"; height="\2"|p' "$PPD")"

  eval "$(sed -nre 's|^\*ImageableArea\s+'"$pagesize"'/[^:]+:\s+"(\S+)\s+(\S+)\s+(\S+)\s+(\S+)".*|bl_x="\1"; bl_y="\2"; tr_x="\3"; tr_y="\4"|p' "$PPD")"
fi
echo "DEBUG: Width: $width, height: $height, absolute margins: $tl_x, $tl_y, $br_x, $br_y" >&2

margin_l=
margin_b=
margin_r=
margin_t=
if test -n "$width" && test -n "$height" && \
   test -n "$bl_x" && test -n "$bl_y" && \
   test -n "$tr_x" && test -n "$tr_y"; then
  margin_l="$bl_x"
  margin_b="$bl_y"
  margin_r="$(printf "scale=8; (%s)-(%s)\n" "$width" "$tr_x" | bc)"
  margin_t="$(printf "scale=8; (%s)-(%s)\n" "$height" "$tr_y" | bc)"
fi
echo "DEBUG: Relative margins: $margin_l, $margin_b, $margin_r, $margin_t" >&2

inject_ps=
if test -n "$margin_l" && test -n "$margin_b" && \
   test -n "$margin_r" && test -n "$margin_t"; then
  inject_ps="<</.HWMargins[$margin_l $margin_b $margin_r $margin_t] /Margins[0 0]>>setpagedevice"
fi
echo "DEBUG: PostScript to be injected: $inject_ps" >&2

ppd_opts=
if test -n "$resolution"; then
  ppd_opts="${ppd_opts:+$ppd_opts }-r$resolution"
fi
if test -n "$width"; then
  ppd_opts="${ppd_opts:+$ppd_opts }-dDEVICEWIDTHPOINTS=$width"
fi
if test -n "$height"; then
  ppd_opts="${ppd_opts:+$ppd_opts }-dDEVICEHEIGHTPOINTS=$height"
fi
echo "DEBUG: PPD options: $ppd_opts" >&2

# Injection
if test -n "$inject_ps"; then
  echo "DEBUG: Injecting PostScript: $inject_ps" >&2

  orig_infile="$infile"

  infile=$(mktemp -t pstopdf.XXXXXX)
  tempfiles="$tempfiles $infile"

  perl -p -e 'if (! $did) { s:(^%!.*)$:\1\n'"$inject_ps"': && $did++; }' "$orig_infile" > "$infile"
fi

# DRM

DRM_MATCH='^%.*Removing the following.*lines is illegal.*Digital Copyright Act'
if egrep -q "$DRM_MATCH" "$infile"; then
  # This PS is DRM-infested. Normalize it with ps2ps first.
  echo "DEBUG: Normalizing Adobe Reader PostScript with ps2ps" >&2

  DRMFILTER="$PS2PS $PS2PS_OPTIONS $ppd_opts - -"
else
  DRMFILTER=cat
fi

echo "DEBUG: Running $DRMFILTER | $PS2PDF $PS2PDF_OPTIONS $ppd_opts - -" >&2
cat "$infile" | $DRMFILTER | $PS2PDF $PS2PDF_OPTIONS $ppd_opts - -