%    Copyright (C) 1994, 1995, 1996, 1997, 1998 Aladdin Enterprises.  All rights reserved.
% 
% This file is part of Aladdin Ghostscript.
% 
% Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND.  No author
% or distributor accepts any responsibility for the consequences of using it,
% or for whether it serves any particular purpose or works at all, unless he
% or she says so in writing.  Refer to the Aladdin Ghostscript Free Public
% License (the "License") for full details.
% 
% Every copy of Aladdin Ghostscript must include a copy of the License,
% normally in a plain ASCII text file named PUBLIC.  The License grants you
% the right to copy, modify and redistribute Aladdin Ghostscript, but only
% under certain conditions described in the License.  Among other things, the
% License requires that the copyright notice and this notice be preserved on
% all copies.


% pdf2dsc.ps
% read pdf file and produce DSC "index" file.
%
% Input  file is named PDFname
% Output file is named DSCname
%
% Run using:
%  gs -dNODISPLAY -sPDFname=pdffilename -sDSCname=tempfilename pdf2dsc.ps
% Then display the PDF file with
%  gs tempfilename
%
% Modified by Geoff Keating <geoffk@ozemail.com.au> 21/12/98:
%	Add DocumentMedia, PageMedia comments
%	Use inherited BoundingBox and Orientation
%	Reformat, add new macro 'puts', generally clean up
% Modified by Johannes Plass <plass@dipmza.physik.uni-mainz.de> 1996-11-05:
%	Adds BoundingBox and Orientation if available.
% Modified by rjl/lpd 9/19/96
%	Updates for compatibility with modified pdf_*.ps code for handling
%	  page ranges (i.e., partial files) better.
% Modified by Geoff Keating <Geoff.Keating@anu.edu.au> 7/3/96:
%	include Title and CreationDate DSC comments (these are displayed by
%	  Ghostview);
%	reduce the size of typical output files by a factor of about 3.
% Modified by L. Peter Deutsch 3/18/96:
%	Removes unnecessary and error-prone code duplicated from pdf_main.ps
% Modified by L. Peter Deutsch for GS 3.33
% Originally by Russell Lang  1995-04-26

% (str1) (str2)  concatstr  (str1str2)
/concatstr {
  2 copy length exch length add string
  dup dup 5 2 roll copy length
% stack: newstring newstring str2 str1-length
  exch putinterval
} bind def

/DSCfile DSCname (w) file def
/puts { DSCfile exch writestring } bind def
/DSCstring 255 string def
/MediaTypes 10 dict def

   GS_PDF_ProcSet begin
   pdfdict begin
   PDFname (r) file
   pdfopen begin
   /FirstPage where { pop } { /FirstPage 1 def } ifelse
   /LastPage where { pop } { /LastPage pdfpagecount def } ifelse

% scan through for media sizes, keep them in the dictionary
   FirstPage 1 LastPage {
      pdfgetpage /MediaBox pget pop   % MediaBox is a required attribute
      aload pop 
      3 -1 roll sub 3 1 roll exch sub exch
      2 array astore 
      aload 3 1 roll 10 string cvs exch 10 string cvs
      (x) exch concatstr concatstr cvn
      MediaTypes 3 1 roll exch put
   } for

% write header and prolog
   (%!PS-Adobe-3.0\n) puts
   Trailer /Info knownoget
    {
      dup /Title knownoget
       {
         (%%Title: ) puts
         DSCfile exch write==
       }
      if
      /CreationDate knownoget
       {
         (%%CreationDate: ) puts
         DSCfile exch write==
       }
      if
    }
   if
   % This is really supposed to be sorted by frequency of usage...
   (%%DocumentMedia: )
   MediaTypes { 
      exch pop
      1 index puts
      (y) puts dup 1 get DSCstring cvs puts
      (x) puts dup 0 get DSCstring cvs puts 
      ( ) puts dup 0 get DSCstring cvs puts
      ( ) puts 1 get DSCstring cvs puts 
      ( 70 white ()\n) puts
      pop (%%+ )
   } forall
   pop

   (%%Pages: ) puts
   LastPage FirstPage sub 1 add DSCstring cvs puts
   (\n%%EndComments\n) puts
   (%%BeginProlog\n) puts
   (/Page null def\n/Page# 0 def\n/PDFSave null def\n) puts
   (/DSCPageCount 0 def\n) puts
   (/DoPDFPage {dup /Page# exch store pdfgetpage pdfshowpage } def\n) puts
   (GS_PDF_ProcSet begin\npdfdict begin\n) puts
   (%%EndProlog\n) puts
   (%%BeginSetup\n) puts
   DSCfile PDFname write==only
   ( \(r\) file pdfopen begin\n) puts
   (%%EndSetup\n) puts
   % process each page
   FirstPage 1 LastPage {
       (%%Page: ) puts
       dup DSCstring cvs puts
       ( ) puts
       dup DSCstring cvs puts
       (\n) puts

       dup pdfgetpage
       dup /MediaBox pget pop
         (%%PageMedia: y) puts
	 aload pop 3 -1 roll sub DSCstring cvs puts
	 (x) puts exch sub DSCstring cvs puts
	 (\n) puts
       dup /CropBox pget {
         (%%PageBoundingBox: ) puts
         {DSCfile exch write=only ( ) puts} forall
         (\n) puts
       } if
       /Rotate pget {
         (%%PageOrientation: ) puts
         90 div cvi 4 mod dup 0 lt {4 add} if
         [(Portrait) (Landscape) (UpsideDown) (Seascape)] exch get puts
         (\n) puts
       } if

       DSCfile exch DSCstring cvs writestring
       ( DoPDFPage\n) puts
    } for
   currentdict pdfclose
   end
   end
   end
% write trailer
(%%Trailer\n) puts
(currentdict pdfclose\nend\nend\nend\n) puts
(%%EOF\n) puts
% close output file and exit
DSCfile closefile
quit
% end of pdf2dsc.ps