%PDF-
%PDF-
Mini Shell
Mini Shell
% Copyright (C) 1999, 2000 Aladdin Enterprises. All rights reserved.
%
% This file is part of AFPL Ghostscript.
%
% AFPL 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 Free Public License (the
% "License") for full details.
%
% Every copy of AFPL 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 AFPL 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.
% $Id: pdfwrite.ps,v 1.3 2000/09/19 18:29:11 lpd Exp $
% Writer for transmuting PDF files.
% NOTES:
% We do editing by replacing objects (in the cache) and then doing a
% simple recursive walk with object renumbering.
% Free variables:
% RMap [per input file] (dict): input_obj# => output_obj#
% PDFfile (file): current input file
% OFile (file): current output file
% XRef (dict): output_obj# => output_file_pos
% ToWrite: 0..N-1 => [obj# gen#]
/.setlanguagelevel where { pop 2 .setlanguagelevel } if
.currentglobal true .setglobal
/PDEBUG where { pop } { /PDEBUG false def } ifelse
% ================ Object mapping ================ %
% Initialize the object number and location map.
/omapinit { % - omapinit -
/RMap 100 dict def
/XRef 100 dict def
} def
% Map an object number.
/omapnew { % <oldobj#> omap <newobj#> <isnew>
RMap 1 index .knownget {
exch pop false
} {
RMap dup length 1 add 2 index exch dup 5 1 roll put pop true
} ifelse
} def
/omap { % <oldobj#> omap <newobj#>
omapnew pop
} bind def
% Save and restore the object map.
% Note that currentomap either returns a copy or calls omapinit.
/currentomap { % <copy> currentomap <omap>
{
[RMap dup length dict copy XRef dup length dict copy]
} {
[RMap XRef] omapinit
} ifelse
} bind def
/setomap { % <omap> setomap -
aload pop /XRef exch def /RMap exch def
} bind def
% ================ Writing ================ %
% ---------------- Low-level output ---------------- %
% Write a string on the output file.
/ows { % <string> ows -
OFile exch writestring
} def
% ---------------- Scalars ---------------- %
/pdfnamechars (!"$&'*+,-.0123456789:;=?@ABCDEFGHIJKLMNOPQRSTUVWXYZ\\^_`abcdefghijklmnopqrstuvwxyz|~) readonly def
/pdfwritename { % <name> pdfwritename -
(/) ows .namestring {
( ) dup 0 4 -1 roll put
//pdfnamechars 1 index search {
pop pop pop
} {
pop 256 add 16 =string cvrs
dup 0 (#) 0 get put
} ifelse ows
} forall
} def
% ---------------- Composite objects ---------------- %
/pdfwriteprocs mark
/resolveR { pdfwriteref }
/O { pdfwritenewref }
.dicttomark readonly def
/pdfwritearray { % <array> pdfwritearray -
dup xcheck {
aload pop //pdfwriteprocs exch get exec
} {
([) ows { pdfwritevalue (\n) ows } forall (]) ows
} ifelse
} def
/pdfwritedict { % <dict> pdfwritedict -
dup xcheck {
pdfwritestream
} {
(<<) ows {
exch pdfwritevalue ( ) ows pdfwritevalue (\n) ows
} forall (>>) ows
} ifelse
} def
% ---------------- References ---------------- %
/pdfwritenewref { % <newobj#> pdfwritenewref -
OFile exch write=only ( 0 R) ows
} def
/pdfwriteref { % <obj#> <gen#> pdfwriteref -
1 index omapnew {
ToWrite dup length 5 -2 roll 2 packedarray put
} {
exch pop exch pop
} ifelse
pdfwritenewref
} def
/pdfcopystring 200 string def
/pdfwritestream { % <streamdict> pdfwritestream -
% Remove File, FilePosition, and StreamKey;
% optimize by replacing an indirect Length.
dup dup length dict copy
% Stack: origdict dict
dup /File undef dup /FilePosition undef dup /StreamKey undef
dup /Length get dup oforce ne {
dup /Length 2 copy oget put
} if
exch dup /File get dup 3 -1 roll /FilePosition get setfileposition
pdfcopystream
} def
% We put copying the stream contents in separate procedures so that we
% can replace this function if desired.
/pdfcopybytes { % <fromfile> <tofile> <length> pdfcopybytes -
{
dup 0 eq { exit } if
//pdfcopystring 0 2 index 2 index length .min getinterval
3 index exch readstring 3 1 roll
3 index 1 index writestring length sub exch not { exit } if
} loop pop pop pop
} def
/pdfcopystream { % <newstreamdict> <file> pdfcopystream -
% (file has been positioned)
1 index pdfwritevalue (stream\n) ows
exch /Length get OFile exch pdfcopybytes
(endstream) ows
} def
% ---------------- General values/objects ---------------- %
/pdfwritetypes mark
% Scalars
/nulltype { =string cvs ows }
/integertype 1 index
/booleantype 1 index
/realtype { OFile exch write===only }
/stringtype 1 index
/nametype { pdfwritename }
% Composite/reference objects
/arraytype { pdfwritearray }
/packedarraytype 1 index
/dicttype { pdfwritedict }
.dicttomark readonly def
/pdfwritevalue { % <obj> pdfwritevalue -
PDEBUG { (****Writing: ) print dup === flush } if
//pdfwritetypes 1 index type get exec
} def
% We make pdfwriteobjdef a separate procedure for external use.
/pdfwriteobjheader { % <newobj#> pdfwriteobjheader -
XRef 1 index OFile .fileposition put
OFile exch write=only ( 0 obj\n) ows
} def
/pdfwriteobjdef { % <newobj#> <value> pdfwriteobjdef -
exch pdfwriteobjheader
pdfwritevalue (\nendobj\n) ows
} def
/pdfwriteobj { % <obj#> <gen#> pdfwriteobj -
1 index exch resolveR exch omap exch pdfwriteobjdef
} def
% ---------------- File-level entities ---------------- %
% Write a PDF file header.
% Free variables: OFile, PDFversion.
/pdfwriteheader { % - pdfwriteheader -
(%PDF-) ows OFile PDFversion write=
(%\347\363\317\323\n) ows
} bind def
% Write a cross-reference table and trailer.
/pdfwritexref { % <firstobj#> <#objs> pdfwritexref -
(xref\n) ows
OFile 2 index write=only ( ) ows OFile 1 index write=
1 index add 1 sub 1 exch {
dup 0 eq {
pop (0000000000 65535 f \n) ows
} {
XRef exch get 1000000000 add =string cvs
dup 0 (0) 0 get put
ows ( 00000 n \n) ows
} ifelse
} for
} bind def
/pdfwritetrailer { % <trailer> pdfwritetrailer -
(trailer\n) ows pdfwritevalue (\n) ows
} bind def
/pdfwritestartxref { % <startpos> pdfwritestartxref -
(startxref\n) ows OFile exch write=
(%%EOF\n) ows
} bind def
% ================ Top-level control ================ %
/pdfwrite { % <file> <trailer> pdfwrite -
10 dict begin
/trailer exch def
/OFile exch def
/ToWrite 100 dict def
omapinit
% Write the PDF file header.
pdfwriteheader
% Write the objects.
trailer {
exch pop dup xcheck { % The only executable objects are references.
aload pop pop pdfwriteobj
} {
pop
} ifelse
} forall
% Walk the object graph.
{
ToWrite dup length dup 0 eq { pop pop exit } if
1 sub 2 copy get 3 1 roll undef aload pop pdfwriteobj
} loop
% Write the xref table and trailer.
/xref OFile fileposition def
0 XRef length 1 add pdfwritexref
trailer dup length 1 add dict copy
dup /Size XRef length 1 add put pdfwritetrailer
xref pdfwritestartxref
end
} def
.setglobal
Zerion Mini Shell 1.0