summaryrefslogtreecommitdiff
path: root/Master/tlpkg/tlgs/lib/pdfopt.ps
blob: 518eed122bdd1fc1859382bc695d69d36de638a9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
%    Copyright (C) 2000, 2001 Aladdin Enterprises.  All rights reserved.
% 
% This software is provided AS-IS with no warranty, either express or
% implied.
% 
% This software is distributed under license and may not be copied,
% modified or distributed except as expressly authorized under the terms
% of the license contained in the file LICENSE in this distribution.
% 
% For more information about licensing, please refer to
% http://www.ghostscript.com/licensing/. For information on
% commercial licensing, go to http://www.artifex.com/licensing/ or
% contact Artifex Software, Inc., 101 Lucas Valley Road #110,
% San Rafael, CA  94903, U.S.A., +1(415)492-9861.

% $Id: pdfopt.ps 9390 2009-01-23 19:04:40Z alexcher $
% PDF linearizer ("optimizer").

.currentglobal true .setglobal
/pdfoptdict 200 dict def
pdfoptdict begin

% This linearizer is designed for simplicity, not for performance.
% See the main program (the last procedure in the file) for comments
% describing the main processing sequence.

% ---------------- Utilities ---------------- %

% ------ Data structures ------ %

% Distinguish dictionaries, arrays, and everything else.
/ifdaelse {		% <obj> <dictproc> <arrayproc> <otherproc> ifdaelse -
  3 index type dup /dicttype eq {
    pop pop pop
  } {
    dup /arraytype ne exch /packedarraytype ne and {
      exch
    } if pop exch pop
  } ifelse exec
} bind def

% Implement dynamically growable arrays using a dictionary.
/darray {		% <size> darray <darray>
  dict
} bind def
/dadd {			% <darray> <value> dadd -
  1 index length exch put
} bind def
/daforall {		% <darray> <proc> daforall -
  /exch cvx /get cvx 3 -1 roll /exec cvx 5 packedarray cvx
  0 1 2 index 0 get length 1 sub 4 -1 roll for
} bind def
/dacontents {		% <darray> dacontents <array>
  [ exch { } daforall ]
} bind def
/dacontstring {		% <darray> dacontstring <string>
  0 1 index { exch pop length add } forall string
  dup /NullEncode filter
			% Stack: darray str filter
  3 -1 roll { 1 index exch writestring } daforall
  closefile
} bind def

% Force an object, mapping it if it is a reference.
/omforcenew {		% <obj> omforce <obj'> <notseen>
  dup oforce 2 copy eq { pop true } { exch 0 get omapnew exch pop } ifelse
} bind def
/omforce {		% <obj> omforce <obj'>
  omforcenew pop
} bind def
/omget {		% <dict|array> <key> omget <obj>
  get omforce
} bind def
% Visit an entire tree.
/omvisit {		% <obj> omvisit -
  omforcenew {
    { { omvisit omvisit } forall }
    { { omvisit } forall }
    { pop }
    ifdaelse
  } {
    pop
  } ifelse
} bind def
% Visit a tree, stopping at references to Page objects.
% (This is only needed for the OpenAction in the Catalog.)
/omvisitnopage {	% <obj> omvisitnopage -
  dup oforce dup type /dicttype eq {
    /Type .knownget { /Page eq } { false } ifelse
  } {
    pop false
  } ifelse {
    pop		% Page reference
  } {
    omforcenew {
      { { omvisitnopage omvisitnopage } forall }
      { { omvisitnopage } forall }
      { pop }
      ifdaelse
    } {
      pop
    } ifelse
  } ifelse
} bind def

% Collect the list of currently mapped object numbers, in order.
/omapped {		% - omapped <obj#s>
  RMap ld_length larray exch lgrowto
  RMap {
    2 index 3 1 roll 1 sub exch lput
  } ld_forall
} bind def

% Collect the list of object numbers passed to omap by a procedure.
/visited {		% <proc> visited <obj#s>
  false currentomap 2 .execn
  omapped exch setomap
} bind def

% ------ Output ------ %

% Provide a framework for closure-based streams.
.currentglobal false .setglobal
userdict /clostreams 20 dict put	% stream -> [data endproc]
.setglobal
% Create a closure-based stream.
/clostream {		% <data> <proc> <endproc> clostream <stream>
  2 index 3 -1 roll /exec load 3 packedarray cvx
  /NullEncode filter
		% Stack: data endproc stream
  clostreams 1 index 5 -2 roll 2 array astore put
} bind def
% Close a closure-based stream.
/closend {		% <stream> closend <result>
  dup closefile clostreams exch
  2 copy get 3 1 roll undef aload pop exec
} bind def

% Implement in-memory output streams.
/msproc {		% <data> <more> <accum> msproc <scratch>
  3 -1 roll dadd { 100 string } { () } ifelse
} bind def
/mstream {		% - mstream <mstream>
  10 darray {msproc} {dacontstring} clostream
} bind def
/mcontents {		% <mstream> mcontents <string>
  closend
} bind def

% Implement a stream that only keeps track of its position.
% (All streams should do this, but the PLRM doesn't require it.)
/posbuf 100 string def
/posproc {		% <data> <more> <accum> posproc <scratch>
  0 2 copy get 5 -1 roll length add put
  pop //posbuf
} bind def
/postream {		% - postream <postream>
  [0] {posproc} {0 get} clostream
} bind def
/poslength {		% <postream> poslength <pos>
  closend
} bind def

% Implement streams with variable-bit-width data.
% Note that these are dictionary objects, not stream objects.
/bitstream {		% <stream> bitstream <bstream>
  4 dict begin /S exch def /N 8 def /B 0 def
  currentdict end
} bind def
/bitwrite {		% <bstream> <value> <width> bitwrite -
  PDFOPTDEBUG { ( ) print 1 index =only (:) print dup = } if
  3 -1 roll begin
  N exch sub dup 0 ge {
    /N exch def N bitshift B add
  } {
    2 copy bitshift B add S exch write
			% Stack: value -left
    { 8 add dup 0 ge { exit } if
      2 copy bitshift 255 and S exch write
    } loop
    /N 1 index def bitshift 255 and
  } ifelse /B exch def
  end
} bind def
/bitflush {		% <bstream> bitflush -
  begin N 8 ne { S B write /B 0 def /N 8 def } if end
} bind def

/bwn {                  % <value> <width> bwn -
  2 copy                % v w v w
  2 exch exp ge {       % v w v>=2**w
    /bwn cvx /rangecheck signalerror
  } if
  bits 3 1 roll bitwrite
} def

% Capture OFile output on the temporary file, in memory, or just as a length.
/totemp {		% <proc> totemp <start> <end>
  TFile fileposition OFile
  /OFile TFile def 3 .execn
  /OFile exch def
  TFile fileposition
} bind def
/tomemory {		% <proc> tomemory <string>
  OFile /OFile mstream def 2 .execn
  OFile mcontents exch /OFile exch def
} bind def
/tolength {		% <proc> tolength <string>
  OFile /OFile postream def 2 .execn
  OFile poslength exch /OFile exch def
} bind def

% Copy a range of bytes from TFile to OFile.
/copyrange {		% <start> <end> copybytes -
  TFile 2 index setfileposition
  exch sub 1024 string exch {
		% Stack: buf left
    2 copy 1 index length .min 0 exch getinterval
    TFile exch readstring pop OFile exch writestring
    1 index length sub dup 0 le { exit } if
  } loop pop pop
} bind def

% Pad with blanks to a specified position.
/padto {		% <pos> padto -
  OFile fileposition sub
  dup 0 lt {
    (ERROR: file position incorrect by ) print =
    /padto cvx /rangecheck signalerror
  } {
    { ( ) ows } repeat
  } ifelse
} bind def

% ---------------- Read objects into memory ---------------- %

/touch {		% <object> touch -
  {
    { touch touch } forall
  } {
    dup xcheck {
		% Executable array, must be an indirect object.
      dup 0 get resolved? { pop pop } { oforce touch } ifelse
    } {
      { touch } forall
    } ifelse
  } {
    pop
  } ifdaelse
} bind def

% ---------------- Replace references with referents ---------------- %

/replaceable? {		% <value> replaceable? <bool>
  dup type /integertype eq exch xcheck not and
} bind def
/replacement {		% <obj|ref> replacement <obj'>
  dup oforce dup replaceable? { exch } if pop
} bind def

/replacerefs {		% <object> replacerefs <object>
  {
    dup {
      2 index 2 index undef
      exch replacement exch replacement
      2 index 3 1 roll put
    } forall
  } {
    0 1 2 index length 1 sub {
      1 index exch 2 copy get replacement put
    } for
  } {
  } ifdaelse
} bind def

/replaceReferences {	% - replaceReferences -
  Objects { replacerefs pop } lforall
		% Delete replaced objects.
  0 1 Objects llength 1 sub {
    Objects 1 index lget replaceable? {
      PDFOPTDEBUG { (Deleting ) print dup = } if
      Generations 1 index 0 lput
    } if pop
  } for
} bind def

% ---------------- Create new objects ---------------- %

/createObjects {	% [<obj>...] createObjects <firstobj#>
  Objects llength dup
  dup 3 index length add growPDFobjects
		% Stack: objects objn objn
  3 1 roll exch {
    Objects 2 index 3 -1 roll lput
    Generations 1 index 1 lput
    1 add
  } forall pop
} bind def

% ---------------- Propagate attributes ---------------- %

/nopropattrs <<
	% Never propagate these.
  /Type dup /Kids dup /Count dup /Parent dup
	% Handle Resources specially.
  /Resources dup
>> def

% Merge Resources.
/mergeres {		% <fromdict> <todict> mergeres -
		% Values in todict take priority over fromdict.
  1 index /Resources .knownget {
    1 index /Resources .knownget {
		% Stack: fromdict todict fromres tores
      exch oforce exch oforce
		% todict's Resources may be shared, so make a copy.
      dup length dict .copydict
      exch {
		% Stack: fromdict todict tores' fromkey fromvalue
	2 index 2 index knownoget {
		% Stack: fromdict todict tores' fromkey fromvalue tovalue
	  exch oforce exch
		% ProcSet is an array, other types are dictionaries.
	  dup type /dicttype eq {
		% Dictionary, not ProcSet.
	    exch dup length 2 index length add dict .copydict .copydict
	  } {
		% Array or packed array, ProcSet.
		% Use dictionaries to do the merge.
	    dup length 2 index length add dict begin
	    exch { dup def } forall { dup def } forall
	    mark currentdict end { pop } forall .packtomark
	  } ifelse
	} if
	2 index 3 1 roll put
      } forall
    } if /Resources exch put pop
  } {
    pop pop
  } ifelse
} bind def

% Merge attributes other than Resources.
/mergeattrs {		% <fromdict> <todict> mergeattrs <fromdict> <todict>
		% Values in todict take priority over fromdict.
  1 index {
		% Stack: fromdict todict fromkey fromvalue
    //nopropattrs 2 index known {
      pop pop
    } {
      2 index 2 index known { pop pop } { 2 index 3 1 roll put } ifelse
    } ifelse
  } forall
} bind def

% Propagate attributes to a subtree.
/proppage {		% <attrs> <subtree> proppage -
		% We should be able to tell when we reach a leaf
		% by finding a Type unequal to /Pages.  Unfortunately,
		% some files distributed by Adobe lack the Type key
		% in some of the Pages nodes!  Instead, we check for Kids.
  dup /Kids knownoget {
		% Accumulate inherited values.
    3 1 roll
		% Stack: kids attrs pagesnode
    dup length dict .copydict mergeattrs
    dup 3 1 roll mergeres
    exch { oforce 1 index exch proppage } forall pop
  } {
		% Merge inherited values into the leaf.
    mergeattrs mergeres
  } ifelse
} bind def

% Propagate attributes to all pages.
/propagateAttributes {	% - propagateAttributes -
  0 dict Trailer /Root oget /Pages oget proppage
} bind def

% ---------------- Identify document-level objects ---------------- %

/identifyDocumentObjects {	% - identifyDocumentObjects <obj#s>
  {
    Trailer /Root omget
    dup /PageMode .knownget { omvisit } if
	% Don't allow omvisit to trace references to Page objects.
    dup /OpenAction .knownget { omvisitnopage } if
    Trailer /Encrypt .knownget { omvisit } if
    dup /Threads .knownget {
        omforce dup //null ne { { omvisitnopage } forall } { pop } ifelse
    } if
    dup /AcroForm .knownget { omvisitnopage } if
    pop
  } visited
} bind def

% ---------------- Identify the objects of each page ---------------- %

/identifyfont {		% <fontref> identifyfont -
  omforce {
    exch /FontDescriptor eq {
      omforce dup /Flags .knownget { 32 and 0 ne } { false } ifelse
      exch {
	exch dup dup /FontFile eq exch /FontFile2 eq or
	exch /FontFile3 eq or 2 index and {
	  fontfiles exch dadd
	} {
	  omvisit
	} ifelse
      } forall pop
    } {
      omvisit
    } ifelse
  } forall
} bind def

% Collect all the objects referenced from a page.  The first object number
% (which may not be the smallest one) is that of the page object itself.
/identifyPageObjects {	% <extra> <page#> identifyPageObjects <obj#s>
  PDFOPTDEBUG {
    (%Objects for page: ) print dup =
  } if
  pdffindpageref
  dup 0 get 3 1 roll
  4 dict begin
  /filter_params 10 darray def
  /images 10 darray def
  /fontfiles 10 darray def
  {
    omforce
		% Stack: pageobj# extra page
		% Visit any extra objects if applicable.
    exch omvisitnopage
		% Visit Annots, if any.
		% We don't try to defer the drawing information.
    dup /Annots .knownget { omvisitnopage } if
		% Visit beads.
    dup /B .knownget { omvisitnopage } if
		% Visit resources dictionaries.
    dup /Resources .knownget {
      omforce dup {
		% Visit the first-level Resource dictionaries.
	omforce pop pop
      } forall {
		% Visit the resources themselves.
		% Skip Image XObjects, and FontFile streams if the
		% FontDescriptor Flags have bit 6 set.
		% We don't try to visit the resources in the order in which
		% the Contents stream(s) reference(s) them.
	exch dup /XObject eq {
	  pop oforce {
	    dup oforce /Subtype get /Image eq {
              dup oforce /DecodeParms .knownget {
                oforce {
                  exch /JBIG2Globals eq {
                    filter_params exch dadd
                  } {
                    pop
                  } ifelse
                } forall
              } if
	      images exch dadd
	    } {
	      omvisit
	    } ifelse pop
	  } forall
	} {
	  /Font eq {
	    oforce { identifyfont pop } forall
	  } {
	    oforce omvisit
	  } ifelse
	} ifelse
      } forall
    } if
		% Visit the Contents stream(s).
    dup /Contents .knownget { omvisit } if
		% Visit Image XObjects.  We don't try to visit them in
		% reference order.
    filter_params { omvisit } daforall
    images { omvisit } daforall
		% Visit FontFile streams.  We don't try to visit them in
		% reference order.
    fontfiles { omvisit } daforall
    pop
  } visited end
		% Stack: pageobj# obj#s_larray
  [ 3 1 roll {
    2 copy eq { pop } { exch } ifelse
  } lforall counttomark 1 roll ]
  PDFOPTDEBUG {
    (%Objects = ) print dup === flush
  } if
} bind def

% Identify the objects of the first page.
/identifyFirstPageObjects {	% - identifyFirstPageObjects <obj#s>
  Trailer /Root oget null
  1 index /PageMode knownoget {
    /UseOutlines eq {
      1 index /Outlines knownoget { exch pop } if
    } if
  } if exch pop
  1 identifyPageObjects
} bind def

% Identify the non-shared objects of the other pages, and the shared objects.
% Note that the page objects themselves may appear to be shared, because of
% references from Dest entries in annotations, but they must be treated as
% non-shared.  Note also that some objects referenced on the first page may
% also be referenced from other pages.
/identifyOtherPageObjects {	% - identifyOtherPageObjects [<pageobj#s> ...]
				%   <sharedobj#s>
  4 dict begin
  /marks lstring Objects llength lgrowto def
		% Collect objects of other pages and identify sharing.
  [ 2 1 pdfpagecount { null exch identifyPageObjects } for ]
  dup {
    { marks exch 2 copy lget 1 add 254 .min lput } forall
  } forall
		% Mark document-level and first page objects.
  CatalogNs { marks exch 255 lput } lforall
  FirstPageNs { marks exch 255 lput } forall
		% Mark the page objects themselves as non-shared.
  dup {
    0 get marks exch 1 lput
  } forall
		% Collect the non-shared objects of each page.
  dup
  [ exch {
    [ exch {
      marks 1 index lget 1 ne { pop } if
    } forall ]
  } forall ]
                % Collect the shared objects of each page.
  exch
  [ exch {
    [ exch {
      marks 1 index lget dup 1 le exch 255 eq or { pop } if
    } forall ]
  } forall ]

                % Collect the shared objects.
  [ 1 1 marks llength 1 sub {
    marks 1 index lget dup 1 le exch 255 eq or { pop } if
  } for ]

  end
} bind def

% Identify objects not associated with any page.
/identifyNonPageObjects {	% - identifyNonPageObjects <obj#s>
  4 dict begin
  /marks lstring Objects llength lgrowto def

  LPDictN     marks exch 1 lput
  PHSN        marks exch 1 lput
  CatalogNs   { marks exch 1 lput } lforall
  FirstPageNs { marks exch 1 lput } forall
  SharedNs    { marks exch 1 lput } forall
  OtherPageNs { { marks exch 1 lput } forall } forall

	%****** PUT THESE IN A REASONABLE ORDER ******
  /npobj larray
  0
  1 1 Objects llength 1 sub {
    marks 1 index lget 0 eq {
      Generations exch lget 0 ne { 1 add } if
    } {
      pop
    } ifelse
  } for 
  lgrowto def

  0
  1 1 Objects llength 1 sub {
    marks 1 index lget 0 eq {
                                          % i
      Generations 1 index lget 0 ne {
                                          % i
        npobj 2 index                     % i nobj 0
        3 -1 roll                         % nobj 0 i
        lput 1 add
      } {
        pop
      } ifelse
    } {
      pop
    } ifelse
  } for 
  pop

  npobj
  end
} bind def

% ---------------- Assign object numbers ---------------- %

% Assign object numbers to all objects that will be copied.
% Return the first (translated) object number in the First Page xref table.
/assignObjectNumbers {		% - assignObjectNumbers -
  OtherPageNs { { omap pop } forall } forall
  SharedNs { omap pop } forall
  NonPageNs { omap pop } lforall
		% Assign object numbers for the First Page xref table last.
  LPDictN omap	% don't pop, this is the return value
  CatalogNs { omap pop } lforall
  FirstPageNs { omap pop } forall
  PHSN omap pop
} bind def

% ---------------- Create the LPDict ---------------- %

% Create the contents of the LPDict.
/createLPDict {			% <phsstart> <phsend> <firstpageend>
				%   <xref0start> <filelength> createLPDict -
  LPDict
  dup /Linearized 1 put
  dup /L 4 -1 roll put		% filelength
  dup /T 4 -1 roll put		% xref0start
  dup /E 4 -1 roll put		% firstpageend
  dup /H 5 -2 roll 1 index sub 2 array astore put	% phsstart, end-start
  dup /O 1 pdffindpageref 0 get omap put
  /N pdfpagecount put
} bind def

% ---------------- Adjust object positions ---------------- %

/adjustObjectPositions {	% <boundary> <deltabelow> <deltaabove>
				%   adjustObjectPositions -
	% Objects fall into 4 categories: LPDict, PHS, Catalog, and others.
	% We handle the first two as special cases.
  XRef {
		% Stack: bdy below above key loc
    dup 5 index ge { 2 } { 3 } ifelse index add
    XRef 3 1 roll ld_put
  } ld_forall pop pop pop
  XRef LPDictN omap HeaderLength ld_put
  XRef PHSN omap PHSStart ld_put
} bind def

% ---------------- Write the output file ---------------- %

% Write objects identified by object number.
/writeobjn {		% <obj#> writeobjn -
  Generations 1 index lget pdfwriteobj
} bind def
/writeobjns {		% <obj#s> writeobjns -
  { writeobjn } forall
} bind def
/lwriteobjns {		% <obj#s> writeobjns -
  { writeobjn } lforall
} bind def

% Write a part of the output file.
/writePart {		% <proc> <label> writePart -
  PDFOPTDEBUG {
    dup print ( count=) print count =only ( start=) print
    OFile { .fileposition } stopped { pop (???) } if =
    2 .execn
    print ( end=) print
    OFile { .fileposition } stopped { pop (???) } if =
  } {
    pop exec
  } ifelse
} bind def

% Write the header.
/writePart1 {		% - writePart1 -
  {
    pdfwriteheader
  } (part1) writePart
} bind def

% Write the linearization parameters dictionary.
/writePart2 {		% - writePart2 -
  {
    LPDictN writeobjn
  } (part2) writePart
} bind def

% Write the First Page xref table and trailer.
% Free variables: FirstPageXN.
/writePart3 {		% <xrefstart> writePart3 -
  {
    FirstPageXN NObjects 1 add 1 index sub pdfwritexref
    Trailer dup length 1 add dict copy Trailer xcheck { cvx } if
    dup /Size NObjects 1 add put
    dup /Prev 4 -1 roll put
    pdfwritetrailer
    0 pdfwritestartxref
  } (part3) writePart
} bind def

% Write the Catalog and other required document-level objects.
% Free variables: CatalogNs.
/writePart4 {		% - writePart4 -
  {
    CatalogNs lwriteobjns
  } (part4) writePart
} bind def

% Write the Primary Hint Stream.
/writePart5 {		% - writePart5 -
  {
    PHSN writeobjn
  } (part5) writePart
} bind def

% Write the First Page's objects.
% Free variables: FirstPageNs.
/writePart6 {		% - writePart6 -
  {
    FirstPageNs writeobjns
  } (part6) writePart
} bind def

% Write the objects of other pages (Page + non-shared objects).
% Free variables: OtherPageNs.
/writePart7 {		% - writePart7 <lengths>
  {
    [ OtherPageNs {
      OFile fileposition exch
      writeobjns OFile fileposition exch sub
    } forall ]
  } (part7) writePart
} bind def

% Write the shared objects of other pages.
% Free variables: SharedNs.
/writePart8 {		% - writePart8 -
  {
    SharedNs writeobjns
  } (part8) writePart
} bind def

% Write the other objects not associated with pages.
% Free variables: NonPageNs.
/writePart9 {		% - writePart9 -
  {
    NonPageNs { writeobjn } lforall
  } (part9) writePart
} bind def

% Write the main xref table and trailer.
% Free variables: FirstPageXN.
/writePart11xref {	% writePart11 -
  {
    0 FirstPageXN pdfwritexref
  } (part11xref) writePart
} bind def
/writePart11rest {	% <part3start> writePart11rest -
  {
    << /Size FirstPageXN >> pdfwritetrailer
    pdfwritestartxref
  } (part11rest) writePart
} bind def

% ---------------- Write hint tables ---------------- %

/bitsneeded {		% <maxvalue> bitsneeded <#bits>
  0 exch { dup 0 eq { pop exit } if exch 1 add exch 2 idiv } loop
} bind def

% Find the start and end of objects in the output.
/omstart {		% <obj#> omstart <pos>
  PDFOPTDEBUG { (start\() print dup =only } if
  omap
  PDFOPTDEBUG { (=>) print dup =only } if
  XRef exch ld_get
  PDFOPTDEBUG { (\) = ) print dup = } if
} bind def
/omend {		% <obj#> omend <pos>
	% The end of an object is the start of the next object.
	% The caller must be sure that this object is not the last one
	% in part 9.
  PDFOPTDEBUG { (end\() print dup =only } if
  omap
  PDFOPTDEBUG { (=>) print dup =only } if
  1 add
	% Check that the requested object wasn't the last one in part 6:
	% the next object in the output file is the first in part 7.
  PHSN omap 1 index eq { pop 1 } if
  XRef exch ld_get
  PDFOPTDEBUG { (\) = ) print dup = } if
} bind def
/omlength {		% <obj#> omlength <length>
  dup omend exch omstart sub
} bind def

% Find the Contents of a page.
/contentsobjects { % <pagedict> contentsobjects <firstobj#> <lastobj#> true
		   % <pagedict> contentsobjects false
  /Contents .knownget {
    dup oforce                   % ref []
    dup type /dicttype eq {
      pop 0 get dup true         % ref ref
    } {
      exch pop                   % []
      dup length 0 ne {
        dup 0 get 0 get          % [] 1st
        exch dup                 % 1st [] [] 
        length 1 sub get 0 get   % 1st last 
        true
      } {
        pop false
      } ifelse
    } ifelse
  } {
    false
  } ifelse
} bind def

/contentsstart {	% <pagedict> contentsstart <pos> true
			% <pagedict> contentsstart false
  contentsobjects { pop omstart true } { false } ifelse
} bind def

/contentslength {	% <pagedict> contentslength <length>
  contentsobjects { omend exch omstart sub } { 0 } ifelse
} bind def


/writePageOffsetHints {
  PDFOPTDEBUG { /writePageOffsetHints == } if
  20 dict begin
  /bits OFile bitstream def

	% Calculate least length of a page.
  FirstPageLength OtherPageLengths { .min } forall
  /minpl exch def

        % Calculate least contents length.
  FirstPageNs 0 get Objects exch lget contentslength
  OtherPageNs { 0 get Objects exch lget contentslength .min } forall
  /mincl exch def

	% The Adobe documentation says that all versions of Acrobat
	% require item 8 (mincl) to be zero.  Patch this here.
  /mincl 0 def

	% Calculate bits needed to represent greatest page length.
  FirstPageLength OtherPageLengths { .max } forall
  minpl sub bitsneeded /maxplbits exch def
	% Calculate bits needed to represent the greatest Contents length.
  FirstPageNs 0 get Objects exch lget contentslength
  OtherPageNs { 0 get Objects exch lget contentslength .max } forall
  mincl sub bitsneeded /maxclbits exch def

	% Per Adobe documentation, Acrobat requires that item 5 (maxplbits)
	% be equal to item 9 (maxclbits).  Set both to the max of the two.
  maxplbits maxclbits .max /maxplbits 1 index def /maxclbits exch def

        % Mapping from object number to shared object reference
  /shared_id_dict FirstPageNs length SharedNs length add dict begin
  0 FirstPageNs { 1 index def 1 add } forall
    SharedNs { 1 index def 1 add } forall
  pop
  currentdict end def 

                % Table F.3 Page offset hint table, header section

                % 1: Least number of objects in a page:
  FirstPageNs length OtherPageNs { length .min } forall
  /minnop 1 index def 32 bwn
		% 2: Location of first page's Page object:
  FirstPageNs 0 get omap XRef exch ld_get 32 bwn
		% 3: Bits needed to represent greatest # of objects in a page:
  FirstPageNs length OtherPageNs { length .max } forall
  minnop sub bitsneeded /maxnopbits 1 index def 16 bwn
		% 4: Least length of a page:
  minpl 32 bwn
		% 5: Bits needed to represent the greatest page length:
  maxplbits 16 bwn
		% 6: Least start of Contents offset:
  0		% (Acrobat requires that this be 0.)
  /minsco 1 index def 32 bwn
		% 7: Bits needed to represent the greatest start of Contents
		% offset:
  0		% (Acrobat ignores this.)
  /maxscobits 1 index def 16 bwn
		% 8: Least contents length:
  mincl 32 bwn
		% 9: Bits needed to represent the greatest Contents length:
  maxclbits 16 bwn
		% 10: Bits needed to represent the greatest number of Shared
   		% Object references:
  FirstPageNs length SharedPageNs { length .max } forall bitsneeded
  /maxsorbits 1 index def 16 bwn
		% 11: Bits needed to identify a Shared Object:
  FirstPageNs length SharedNs length add bitsneeded
  /sobits 1 index def 16 bwn
		% 12: Bits needed to represent numerator of fraction:
  2
  /numfbits 1 index def 16 bwn
		% 13: Denominator of fraction:
  1
  /denf 1 index def 16 bwn

                % Table F.4 Page offset hint table, per-page entry

                % 1: Number of objects in pages:
  FirstPageNs length minnop sub maxnopbits bwn
  OtherPageNs {
    length minnop sub maxnopbits bwn
  } forall
  bits bitflush

		% 2: Total length of pages in bytes;
  FirstPageLength minpl sub maxplbits bwn
  OtherPageLengths {
    minpl sub maxplbits bwn
  } forall
  bits bitflush

		% 3: Number of shared objects referenced from page:
  FirstPageNs length maxsorbits bwn 
  SharedPageNs { length maxsorbits bwn } forall
  bits bitflush
                % 4: A shared object identifier:
  FirstPageNs { shared_id_dict exch get sobits bwn } forall
  SharedPageNs {
    { shared_id_dict exch get sobits bwn
    } forall
  } forall
  bits bitflush

                % 5: Numerator of fractional position for each shared object:
  FirstPageNs { pop 0 numfbits bwn  } forall
  SharedPageNs {
    { pop 0 numfbits bwn 
    } forall
  } forall
  bits bitflush

		% 6: Contents offsets:
                % Following Implementation Note 133 section 6 is empty.
  maxscobits 0 gt {
    [FirstPageNs OtherPageNs aload pop] {
       0 get Objects exch lget contentsstart { minsco sub } { 0 } ifelse
       maxscobits bwn
    } forall
    bits bitflush
  } if

                % 7: Contents lengths:
  [FirstPageNs OtherPageNs aload pop] {
    0 get Objects exch lget contentslength mincl sub maxclbits bwn
  } forall
  bits bitflush

  end

} bind def

/writeSharedObjectHints {
  PDFOPTDEBUG { /writeSharedObjectHints == } if
  20 dict begin
  /bits OFile bitstream def
  /obj_count SharedNs length FirstPageNs length add def

 		% Table F.5 Shared object hint table, header section

              	% 1: Object number of first object in Shared Objects section
  0 32 bwn
		% 2: Location of first object in Shared Objects section:
		% If there are no shared objects,
		% Acrobat sets this to the location of linearization
		% parameters object (the very first object).
  { pdfwriteheader } tomemory length 32 bwn
		% 3: Number of Shared Object entries for first page:
  FirstPageNs length 32 bwn
		% 4: Number of Shared Object entries for Shared Objects
		% section
  obj_count 32 bwn
		% 5: Bits needed to represent the greatest number of objects
		% in a shared object group (always 0, because all groups
		% have only 1 object):
  0 16 bwn
		% 6: Least length of a Shared Object Group in bytes:
  16#7fffffff FirstPageNs { omlength .min } forall
                 SharedNs { omlength .min } forall
  /minsol 1 index def 32 bwn
		% 7: Bits needed to represent the greatest length of a
		% Shared Object Group:
  0 FirstPageNs { omlength .max } forall
       SharedNs { omlength .max } forall
  minsol sub bitsneeded
  /maxsolbits 1 index def 16 bwn

                % Table F.6 Shared object hint table, shared object group entry

                % 1: Lengths of shared object groups:
  FirstPageNs { omlength minsol sub maxsolbits bwn } forall
     SharedNs { omlength minsol sub maxsolbits bwn } forall
  bits bitflush
		% 2: MD5 flag:
  obj_count { 0 1 bwn } repeat
  bits bitflush
                % 3: No MD5 shared object signatures.

                % 4: No number_number_of_objects_in_the_group - 1
  end
} bind def

% ---------------- Main program ---------------- %

/pdfOptimize {		% <infile> <outfile> pdfOptimize -
  realtime 3 1 roll
  exch pdfdict begin pdfopenfile dup begin
  40 dict begin
  /IDict exch def
  /OFile exch def
  /starttime exch def
  /ToWrite 100 dict def
  /now {
    QUIET { pop } { print (, t = ) print realtime starttime sub = flush } ifelse
  } def
  omapinit
  
	% Create and open a temporary file.
	% Because of .setsafe, we have to open it as read-write, rather than
	% opening for writing, then closing it and reopening it for reading.

  null (w+) .tempfile /TFile exch def /TFileName exch def
  .setsafe

	% Read all objects into memory.

  Trailer touch
  (Read objects) now

        % Encrypted files are not yet supported.
  Trailer /Encrypt known {
    (ERROR: Encrypted files are not yet supported.) = flush
    /pdfOptimize cvx /limitcheck signalerror
  } if

	% Replace indirect references to numbers.  This is needed
	% for the Length of streams, and doesn't hurt anything else.

  replaceReferences
  (Replaced references) now

	% Create the two new objects: the linearization parameter
	% dictionary, and the Primary Hint Stream.

  /LPDict 10 dict def
  /PHS 10 dict cvx def		% executable = stream
  [LPDict PHS] createObjects
  /LPDictN 1 index def 1 add
  /PHSN exch def
  PDFOPTDEBUG { << /LPDictN LPDictN /PHSN PHSN >> === } if

	% Count the number of objects in the output.

  0 0 1 Objects llength 1 sub {
    Generations exch lget 0 ne { 1 add } if
  } for
  /NObjects exch def
  QUIET not { NObjects =only ( objects total) = flush } if

	% Propagate inherited attributes down the page tree.

  propagateAttributes
  (Propagated attributes) now

	% Identify the document-level objects (part 4).

  identifyDocumentObjects /CatalogNs exch def
  QUIET not { CatalogNs === flush } if
  (Identified Catalog) now

  	% Identify the first page's objects (part 6),
	% including the Outlines tree if appropriate.

  pdfopencache
  /FirstPageNs identifyFirstPageObjects def
  QUIET not { FirstPageNs === flush } if
  (Identified first page) now

	% Identify shared vs. non-shared objects for remaining pages
	% (parts 7 and 8).

  identifyOtherPageObjects
  /SharedNs exch def
  /SharedPageNs exch def
  /OtherPageNs exch def
  QUIET not { OtherPageNs === flush SharedNs === flush } if
  (Identified other pages) now

	% Identify objects not associated with any page (part 9).

  /NonPageNs identifyNonPageObjects def
  QUIET not { NonPageNs { === } forall flush } if
  (Identified non-pages) now

	% Assign final object numbers to all the objects.
	% (The omap is currently empty.)

  /FirstPageXN assignObjectNumbers def
  (Assigned objects #s) now

	% Write the document-level objects (part 4).

  { writePart4 } totemp
  /CatalogTempEnd exch def /CatalogTempStart exch def
  (Wrote Catalog) now

	% Write the first page's objects (part 6).

  { writePart6 } totemp
  /FirstPageTempEnd exch def /FirstPageTempStart exch def
  (Wrote first page) now

	% Write the non-shared objects for other pages (part 7).

  { writePart7 /OtherPageLengths exch def } totemp
  /OtherPageTempEnd exch def /OtherPageTempStart exch def
  (Wrote other pages) now

	% Write the shared objects for other pages (part 8).

  { writePart8 } totemp
  /SharedTempEnd exch def /SharedTempStart exch def
  (Wrote shared objects) now

	% Write the objects not associated with pages (part 9).

  { writePart9 } totemp
  /NonPageTempEnd exch def /NonPageTempStart exch def

	% Compute conservative lengths of parts 2,3,5,11 of the output.
	% It's OK for these to be too large, but not too small.

  % Make dummy XRef entres for LPDict and PHS.
  XRef LPDictN omap 0 ld_put
  XRef PHSN omap 0 ld_put

  /HeaderLength {	% this is exact
    writePart1			% part 1
  } tolength def
  /CatalogLength	% this is exact
    CatalogTempEnd CatalogTempStart sub def	% part 4
  /FirstPageLength	% this is exact
    FirstPageTempEnd FirstPageTempStart sub def	% part 6
  /OtherObjectsLength	% this is exact
    NonPageTempEnd OtherPageTempStart sub def	% parts 7,8,9
  /ObjectsLength	% this is exact
    CatalogLength FirstPageLength add OtherObjectsLength add def
  /XrefLength {			% part 11
	% The LPDict must end within the first 1024 bytes,
	% so the start of the FirstPage xref table can't exceed 1024.
    writePart11xref 1024 writePart11rest
  } tolength def
  /NominalFileLength 	% Make a generous allowance for parts 2,3,5.
    HeaderLength ObjectsLength 3 mul add 10000 add 99999 .max def
  /FirstPageXrefLength {	% part 3
    NominalFileLength writePart3
  } tolength def
  /LPDictLength {		% part 2
    NominalFileLength dup 2 mul 2 copy add 1 index dup createLPDict writePart2
  } tolength def

	% Compute a few additional values from the above.

  /XrefBeginLength {
    (xref\n0 ) ows
    OFile FirstPageXN write=
  } tolength def
  HeaderLength LPDictLength add
  /FirstPageXrefStart 1 index def
  FirstPageXrefLength add
  /CatalogStart 1 index def
  CatalogLength add		% phsstart
  /PHSStart exch def

	% Adjust the object positions ignoring PHS.
	% (Writing the PHS needs these.)

  0 0 CatalogStart CatalogTempStart sub adjustObjectPositions
  % Make a temporary XRef entry for the PHS, for the benefit of omend.
  XRef PHSN omap CatalogStart ld_put
  (Adjusted positions) now

        % Construct the hint tables (part 5).

  { writePageOffsetHints } totemp
  pop /PHSTempStart exch def
  { writeSharedObjectHints } totemp
  exch PHSTempStart sub PHS /S 3 -1 roll put
  PHSTempStart sub /PHSTempLength exch def
  (Wrote hints) now

  % Prepare to read TFile.
%  TFile closefile
%  /TFile TFileName (r) file def

  PHS
    dup /File TFile put
    dup /FilePosition PHSTempStart put
    dup /Length PHSTempLength put
  pop
  /PHSLength { writePart5 } tolength def

	% Construct the linearization parameter dictionary (part 2).

  PHSStart
  dup PHSLength add		% phsend
  /FirstPageStart 1 index def
  dup FirstPageLength add	% firstpageend
  dup OtherObjectsLength add
  /XrefStart 1 index def
  XrefBeginLength add		% xref0start
  dup XrefBeginLength sub XrefLength add	% fileend
	% Because of a bug, Acrobat Reader doesn't recognize any file
	% shorter than 1K as linearized.  Patch this here.
      % Acrobat 9 insists on 4KB
  4096 .max
  /FileLength 1 index def
  createLPDict

	% Adjust the object positions again, taking the PHS into account.

  PHSStart 0 PHSLength adjustObjectPositions
  (Readjusted positions) now

	% Finally, write the output file.

  writePart1
  writePart2
  FirstPageXrefStart padto
  XrefStart writePart3
  CatalogStart padto
  CatalogTempStart CatalogTempEnd copyrange	% part 4
  writePart5
  FirstPageStart padto
  FirstPageTempStart NonPageTempEnd copyrange	% parts 6,7,8,9
  % No Overflow Hint Stream (part 10).
  XrefStart padto
  writePart11xref
  { FirstPageXrefStart writePart11rest } tomemory
  FileLength 1 index length sub padto ows
  (Wrote output file) now

	% Wrap up.

  TFile closefile TFileName deletefile
  end		% temporary dict
  end		% IDict
} bind def

end			% pdfoptdict
.setglobal

% Check for command line arguments.
[ shellarguments {
  ] dup length 2 eq {
	% Load the pdfwrite utilities if necessary.
    /omapinit where { pop } { (pdfwrite.ps) runlibfile } ifelse
    save exch
    aload pop exch (r) file exch (w) file
    3000000 setvmthreshold
    0 setobjectformat
    pdfoptdict begin pdfOptimize end
    restore
  } {
    (Usage: gs -dNODISPLAY -- pdfopt.ps input.pdf output.pdf) = flush quit
  } ifelse
} {
  pop
} ifelse