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% Copyright (C) 1999, 2000, 2001 Aladdin Enterprises. All rights reserved.
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%
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% This software is provided AS-IS with no warranty, either express or
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% implied.
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%
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% This software is distributed under license and may not be copied,
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% modified or distributed except as expressly authorized under the terms
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% of the license contained in the file LICENSE in this distribution.
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%
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% For more information about licensing, please refer to
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% http://www.ghostscript.com/licensing/. For information on
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% commercial licensing, go to http://www.artifex.com/licensing/ or
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% contact Artifex Software, Inc., 101 Lucas Valley Road #110,
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% San Rafael, CA 94903, U.S.A., +1(415)492-9861.
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% $Id: pdfwrite.ps,v 1.11 2003/05/20 13:46:22 alexcher Exp $
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% Writer for transmuting PDF files.
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% NOTES:
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% We do editing by replacing objects (in the cache) and then doing a
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% simple recursive walk with object renumbering.
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% Free variables:
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% RMap [per input file] (dict): input_obj# => output_obj#
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% PDFfile (file): current input file
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% OFile (file): current output file
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% XRef (dict): output_obj# => output_file_pos
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% ToWrite: 0..N-1 => [obj# gen#]
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/.setlanguagelevel where { pop 2 .setlanguagelevel } if
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.currentglobal true .setglobal
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/PDFWRDEBUG where { pop } { /PDFWRDEBUG false def } ifelse
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% ======== Long dictionary support =============== %
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% The key must be a non-negative iteger.
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/ld_dict { % <len> ld_dict <ldict>
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pop << 0 <<>> >>
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} bind def
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/ld_length { % <ldict> ld_length <length>
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} bind def
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/ld_get { % <ldict> <key> ld_get <any>
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dup 3 1 roll -15 bitshift get exch get
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} bind def
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/ld_put { % <ldict> <key> <any> ld_put -
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3 1 roll dup % any ldict key key
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4 1 roll -15 bitshift % key any ldict key>>15
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2 copy known {
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get % key any subdict
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3 1 roll put % -
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} {
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64 dict dup 6 1 roll % <<>> key any ldict key>>15 <<>>
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put put
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} ifelse % -
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} bind def
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/ld_known { % <ldict> <key> ld_known <bool>
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dup 3 1 roll -15 bitshift % key <<>> key<<15
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2 copy known {
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get exch known
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} {
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pop pop pop //false
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} ifelse
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} bind def
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/ld_knownget { % <ldict> <key> ld_known false | <any> true
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dup 3 1 roll -15 bitshift % key <<>> key<<15
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2 copy known {
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get exch .knownget
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} {
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pop pop pop //false
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} ifelse
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} bind def
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/ld_def { % <key> <any> ld_def -
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currentdict 3 1 roll ld_put
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} bind def
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/ld_forall { % <ldict> <proc} ld_forall -
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{ forall exch pop } aload pop
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4 2 roll 4 packedarray cvx forall
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} bind def
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/ld_clone { % <ldict> ld_clone <ldict copy>
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<< exch { dup length dict copy } forall >>
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} bind def
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% ================ Object mapping ================ %
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% Initialize the object number and location map.
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/omapinit { % - omapinit -
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/RMap 100 ld_dict def
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/XRef 100 ld_dict def
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PDFWRDEBUG { (omapinit) = } if
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} bind def
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% Map an object number.
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/omapnew { % <oldobj#> omap <newobj#> <isnew>
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RMap 1 index ld_knownget {
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exch pop //false
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} {
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PDFWRDEBUG { (omap\() print dup =only } if
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RMap dup ld_length 1 add % old# <<>> len+1
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2 index exch dup % old# <<>> old# len+1 len+1
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5 1 roll % len+1 old# <<>> old# len+1
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ld_put pop //true % len+1 true
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PDFWRDEBUG { (\) = ) print 1 index = } if
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} ifelse
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} bind def
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/omap { % <oldobj#> omap <newobj#>
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omapnew pop
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} bind def
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% Save and restore the object map.
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% Note that currentomap either returns a copy or calls omapinit.
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/currentomap { % <copy> currentomap <omap>
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{
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[RMap ld_clone XRef ld_clone]
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} {
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[RMap XRef] omapinit
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} ifelse
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} bind def
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/setomap { % <omap> setomap -
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aload pop /XRef exch def /RMap exch def
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PDFWRDEBUG {
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(setomap: #Xref = ) print XRef ld_length =only
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(, #RMap = ) print RMap ld_length =
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} if
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} bind def
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% ================ Writing ================ %
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% ---------------- Low-level output ---------------- %
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% Write a string on the output file.
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/ows { % <string> ows -
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OFile exch writestring
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} bind def
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% ---------------- Scalars ---------------- %
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% Note that the '#' character isn't legal in a name unless it is a prefix
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% for a hex encoded character (for PDF 1.2 and later). The following assumes
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% that the names are already valid PDF 1.2+ names so that we can treat the
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% '#' as a legal character. The next two hex characters are already in the
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% set of valid name characters. PDF 1.1 and earlier allowed spaces in names
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% which probably wouldn't make it past the tokenizer anyway.
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/pdfnamechars
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(!"#$&'*+,-.0123456789:;=?@ABCDEFGHIJKLMNOPQRSTUVWXYZ\\^_`abcdefghijklmnopqrstuvwxyz|~)
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readonly def
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/pdfwritename { % <name> pdfwritename -
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(/) ows .namestring {
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( ) dup 0 4 -1 roll put
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//pdfnamechars 1 index search {
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pop pop pop
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} {
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pop 0 get 256 add 16 =string cvrs
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dup 0 (#) 0 get put
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} ifelse ows
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} forall
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} bind def
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% ---------------- Composite objects ---------------- %
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/pdfwriteprocs mark
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/resolveR { pdfwriteref }
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/O { pdfwritenewref }
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.dicttomark readonly def
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/pdfwritearray { % <array> pdfwritearray -
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dup xcheck {
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aload pop //pdfwriteprocs exch get exec
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} {
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% Because of a bug in Acrobat's parser for linearization parameters,
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% we have to include some whitespace after the opening [ (!).
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([ ) ows { pdfwritevalue (\n) ows } forall (]) ows
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} ifelse
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} bind def
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/pdfwritedict { % <dict> pdfwritedict -
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dup xcheck {
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pdfwritestream
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} {
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(<<) ows {
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exch pdfwritevalue ( ) ows pdfwritevalue (\n) ows
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} forall (>>) ows
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} ifelse
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} bind def
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% ---------------- References ---------------- %
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/pdfwritenewref { % <newobj#> pdfwritenewref -
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OFile exch write=only ( 0 R) ows
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} bind def
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/pdfwriteref { % <obj#> <gen#> pdfwriteref -
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1 index omapnew {
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ToWrite dup length 5 -2 roll 2 packedarray put
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} {
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exch pop exch pop
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} ifelse
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pdfwritenewref
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} bind def
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/pdfcopystring 200 string def
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/pdfwritestream { % <streamdict> pdfwritestream -
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% Remove File, FilePosition, and StreamKey;
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% optimize by replacing an indirect Length.
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dup dup length dict copy
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% Stack: origdict dict
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dup /File undef dup /FilePosition undef dup /StreamKey undef
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dup /Length get dup oforce ne {
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dup /Length 2 copy oget put
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} if
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exch dup /File get dup 3 -1 roll /FilePosition get setfileposition
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pdfcopystream
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} bind def
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% We put copying the stream contents in separate procedures so that we
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% can replace this function if desired.
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/pdfcopybytes { % <fromfile> <tofile> <length> pdfcopybytes -
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{
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dup 0 eq { exit } if
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//pdfcopystring 0 2 index 2 index length .min getinterval
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3 index exch readstring 3 1 roll
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3 index 1 index writestring length sub exch not { exit } if
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} loop pop pop pop
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} bind def
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/pdfcopystream { % <newstreamdict> <file> pdfcopystream -
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% (file has been positioned)
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1 index pdfwritevalue (stream\n) ows
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exch /Length get OFile exch pdfcopybytes
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(endstream) ows
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} bind def
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% ---------------- General values/objects ---------------- %
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/pdfwritetypes mark
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% Scalars
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/nulltype { pop (null) ows } bind
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/integertype { =string cvs ows } bind
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/booleantype 1 index
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/realtype { OFile exch write===only } bind
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/stringtype 1 index
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/nametype { pdfwritename } bind
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% Composite/reference objects
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/arraytype { pdfwritearray } bind
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/packedarraytype 1 index
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/dicttype { pdfwritedict } bind
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.dicttomark readonly def
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/pdfwritevalue { % <obj> pdfwritevalue -
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PDFWRDEBUG { (****Writing: ) print dup === flush } if
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//pdfwritetypes 1 index type get exec
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} bind def
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% We make pdfwriteobjdef a separate procedure for external use.
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/pdfwriteobjheader { % <newobj#> pdfwriteobjheader -
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XRef 1 index OFile .fileposition ld_put
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PDFWRDEBUG { (XRef\() print dup =only (\) = ) print XRef 1 index ld_get = } if
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OFile exch write=only ( 0 obj\n) ows
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} bind def
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/pdfwriteobjdef { % <newobj#> <value> pdfwriteobjdef -
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exch pdfwriteobjheader
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pdfwritevalue (\nendobj\n) ows
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} bind def
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/pdfwriteobj { % <obj#> <gen#> pdfwriteobj -
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1 index exch resolveR exch omap exch pdfwriteobjdef
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} bind def
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% ---------------- File-level entities ---------------- %
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% Write a PDF file header.
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% Free variables: OFile, PDFversion.
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/pdfwriteheader { % - pdfwriteheader -
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(%PDF-) ows OFile PDFversion write=
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(%\347\363\317\323\n) ows
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} bind def
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% Write a cross-reference table and trailer.
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/pdfwritexref { % <firstobj#> <#objs> pdfwritexref -
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(xref\n) ows
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OFile 2 index write=only ( ) ows OFile 1 index write=
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1 index add 1 sub 1 exch {
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dup 0 eq {
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pop (0000000000 65535 f \n) ows
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} {
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XRef exch ld_get 1000000000 add =string cvs
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dup 0 (0) 0 get put
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ows ( 00000 n \n) ows
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} ifelse
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} for
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} bind def
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/pdfwritetrailer { % <trailer> pdfwritetrailer -
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(trailer\n) ows pdfwritevalue (\n) ows
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} bind def
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/pdfwritestartxref { % <startpos> pdfwritestartxref -
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(startxref\n) ows OFile exch write=
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(%%EOF\n) ows
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} bind def
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% ================ Top-level control ================ %
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/pdfwrite { % <file> <trailer> pdfwrite -
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10 dict begin
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/trailer exch def
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/OFile exch def
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/ToWrite 100 dict def
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omapinit
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% Write the PDF file header.
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pdfwriteheader
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% Write the objects.
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trailer {
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exch pop dup xcheck { % The only executable objects are references.
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aload pop pop pdfwriteobj
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} {
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pop
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} ifelse
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} forall
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% Walk the object graph.
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{
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ToWrite dup length dup 0 eq { pop pop exit } if
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1 sub 2 copy get 3 1 roll undef aload pop pdfwriteobj
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} loop
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% Write the xref table and trailer.
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/xref OFile fileposition def
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trailer dup length 1 add dict copy
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dup /Size XRef ld_length 1 add put pdfwritetrailer
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xref pdfwritestartxref
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end
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} bind def
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.setglobal
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