| 2 |
- |
1 |
% Copyright (C) 2000, 2001 Aladdin Enterprises. All rights reserved.
|
|
|
2 |
%
|
|
|
3 |
% This software is provided AS-IS with no warranty, either express or
|
|
|
4 |
% implied.
|
|
|
5 |
%
|
|
|
6 |
% This software is distributed under license and may not be copied,
|
|
|
7 |
% modified or distributed except as expressly authorized under the terms
|
|
|
8 |
% of the license contained in the file LICENSE in this distribution.
|
|
|
9 |
%
|
|
|
10 |
% For more information about licensing, please refer to
|
|
|
11 |
% http://www.ghostscript.com/licensing/. For information on
|
|
|
12 |
% commercial licensing, go to http://www.artifex.com/licensing/ or
|
|
|
13 |
% contact Artifex Software, Inc., 101 Lucas Valley Road #110,
|
|
|
14 |
% San Rafael, CA 94903, U.S.A., +1(415)492-9861.
|
|
|
15 |
|
|
|
16 |
% $Id: pdfopt.ps,v 1.20 2003/06/02 19:52:58 alexcher Exp $
|
|
|
17 |
% PDF linearizer ("optimizer").
|
|
|
18 |
|
|
|
19 |
.currentglobal true .setglobal
|
|
|
20 |
/pdfoptdict 200 dict def
|
|
|
21 |
pdfoptdict begin
|
|
|
22 |
|
|
|
23 |
% This linearizer is designed for simplicity, not for performance.
|
|
|
24 |
% See the main program (the last procedure in the file) for comments
|
|
|
25 |
% describing the main processing sequence.
|
|
|
26 |
|
|
|
27 |
% ---------------- Utilities ---------------- %
|
|
|
28 |
|
|
|
29 |
% ------ Data structures ------ %
|
|
|
30 |
|
|
|
31 |
% Distinguish dictionaries, arrays, and everything else.
|
|
|
32 |
/ifdaelse { % <obj> <dictproc> <arrayproc> <otherproc> ifdaelse -
|
|
|
33 |
3 index type dup /dicttype eq {
|
|
|
34 |
pop pop pop
|
|
|
35 |
} {
|
|
|
36 |
dup /arraytype ne exch /packedarraytype ne and {
|
|
|
37 |
exch
|
|
|
38 |
} if pop exch pop
|
|
|
39 |
} ifelse exec
|
|
|
40 |
} bind def
|
|
|
41 |
|
|
|
42 |
% Implement dynamically growable arrays using a dictionary.
|
|
|
43 |
/darray { % <size> darray <darray>
|
|
|
44 |
dict
|
|
|
45 |
} bind def
|
|
|
46 |
/dadd { % <darray> <value> dadd -
|
|
|
47 |
1 index length exch put
|
|
|
48 |
} bind def
|
|
|
49 |
/daforall { % <darray> <proc> daforall -
|
|
|
50 |
/exch cvx /get cvx 3 -1 roll /exec cvx 5 packedarray cvx
|
|
|
51 |
|
|
|
52 |
} bind def
|
|
|
53 |
/dacontents { % <darray> dacontents <array>
|
|
|
54 |
[ exch { } daforall ]
|
|
|
55 |
} bind def
|
|
|
56 |
/dacontstring { % <darray> dacontstring <string>
|
|
|
57 |
|
|
|
58 |
dup /NullEncode filter
|
|
|
59 |
% Stack: darray str filter
|
|
|
60 |
3 -1 roll { 1 index exch writestring } daforall
|
|
|
61 |
closefile
|
|
|
62 |
} bind def
|
|
|
63 |
|
|
|
64 |
% Force an object, mapping it if it is a reference.
|
|
|
65 |
/omforcenew { % <obj> omforce <obj'> <notseen>
|
|
|
66 |
dup oforce 2 copy eq { pop true } { exch 0 get omapnew exch pop } ifelse
|
|
|
67 |
} bind def
|
|
|
68 |
/omforce { % <obj> omforce <obj'>
|
|
|
69 |
omforcenew pop
|
|
|
70 |
} bind def
|
|
|
71 |
/omget { % <dict|array> <key> omget <obj>
|
|
|
72 |
get omforce
|
|
|
73 |
} bind def
|
|
|
74 |
% Visit an entire tree.
|
|
|
75 |
/omvisit { % <obj> omvisit -
|
|
|
76 |
omforcenew {
|
|
|
77 |
{ { omvisit omvisit } forall }
|
|
|
78 |
{ { omvisit } forall }
|
|
|
79 |
{ pop }
|
|
|
80 |
ifdaelse
|
|
|
81 |
} {
|
|
|
82 |
pop
|
|
|
83 |
} ifelse
|
|
|
84 |
} bind def
|
|
|
85 |
% Visit a tree, stopping at references to Page objects.
|
|
|
86 |
% (This is only needed for the OpenAction in the Catalog.)
|
|
|
87 |
/omvisitnopage { % <obj> omvisitnopage -
|
|
|
88 |
dup oforce dup type /dicttype eq {
|
|
|
89 |
/Type .knownget { /Page eq } { false } ifelse
|
|
|
90 |
} {
|
|
|
91 |
pop false
|
|
|
92 |
} ifelse {
|
|
|
93 |
pop % Page reference
|
|
|
94 |
} {
|
|
|
95 |
omforcenew {
|
|
|
96 |
{ { omvisitnopage omvisitnopage } forall }
|
|
|
97 |
{ { omvisitnopage } forall }
|
|
|
98 |
{ pop }
|
|
|
99 |
ifdaelse
|
|
|
100 |
} {
|
|
|
101 |
pop
|
|
|
102 |
} ifelse
|
|
|
103 |
} ifelse
|
|
|
104 |
} bind def
|
|
|
105 |
|
|
|
106 |
% Collect the list of currently mapped object numbers, in order.
|
|
|
107 |
/omapped { % - omapped <obj#s>
|
|
|
108 |
RMap ld_length larray exch lgrowto
|
|
|
109 |
RMap {
|
|
|
110 |
2 index 3 1 roll 1 sub exch lput
|
|
|
111 |
} ld_forall
|
|
|
112 |
} bind def
|
|
|
113 |
|
|
|
114 |
% Collect the list of object numbers passed to omap by a procedure.
|
|
|
115 |
/visited { % <proc> visited <obj#s>
|
|
|
116 |
false currentomap 2 .execn
|
|
|
117 |
omapped exch setomap
|
|
|
118 |
} bind def
|
|
|
119 |
|
|
|
120 |
% ------ Output ------ %
|
|
|
121 |
|
|
|
122 |
% Provide a framework for closure-based streams.
|
|
|
123 |
.currentglobal false .setglobal
|
|
|
124 |
userdict /clostreams 20 dict put % stream -> [data endproc]
|
|
|
125 |
.setglobal
|
|
|
126 |
% Create a closure-based stream.
|
|
|
127 |
/clostream { % <data> <proc> <endproc> clostream <stream>
|
|
|
128 |
2 index 3 -1 roll /exec load 3 packedarray cvx
|
|
|
129 |
/NullEncode filter
|
|
|
130 |
% Stack: data endproc stream
|
|
|
131 |
clostreams 1 index 5 -2 roll 2 array astore put
|
|
|
132 |
} bind def
|
|
|
133 |
% Close a closure-based stream.
|
|
|
134 |
/closend { % <stream> closend <result>
|
|
|
135 |
dup closefile clostreams exch
|
|
|
136 |
2 copy get 3 1 roll undef aload pop exec
|
|
|
137 |
} bind def
|
|
|
138 |
|
|
|
139 |
% Implement in-memory output streams.
|
|
|
140 |
/msproc { % <data> <more> <accum> msproc <scratch>
|
|
|
141 |
3 -1 roll dadd { 100 string } { () } ifelse
|
|
|
142 |
} bind def
|
|
|
143 |
/mstream { % - mstream <mstream>
|
|
|
144 |
10 darray {msproc} {dacontstring} clostream
|
|
|
145 |
} bind def
|
|
|
146 |
/mcontents { % <mstream> mcontents <string>
|
|
|
147 |
closend
|
|
|
148 |
} bind def
|
|
|
149 |
|
|
|
150 |
% Implement a stream that only keeps track of its position.
|
|
|
151 |
% (All streams should do this, but the PLRM doesn't require it.)
|
|
|
152 |
/posbuf 100 string def
|
|
|
153 |
/posproc { % <data> <more> <accum> posproc <scratch>
|
|
|
154 |
|
|
|
155 |
pop //posbuf
|
|
|
156 |
} bind def
|
|
|
157 |
/postream { % - postream <postream>
|
|
|
158 |
[0] {posproc} {0 get} clostream
|
|
|
159 |
} bind def
|
|
|
160 |
/poslength { % <postream> poslength <pos>
|
|
|
161 |
closend
|
|
|
162 |
} bind def
|
|
|
163 |
|
|
|
164 |
% Implement streams with variable-bit-width data.
|
|
|
165 |
% Note that these are dictionary objects, not stream objects.
|
|
|
166 |
/bitstream { % <stream> bitstream <bstream>
|
|
|
167 |
4 dict begin /S exch def /N 8 def /B 0 def
|
|
|
168 |
currentdict end
|
|
|
169 |
} bind def
|
|
|
170 |
/bitwrite { % <bstream> <value> <width> bitwrite -
|
|
|
171 |
PDFOPTDEBUG { ( ) print 1 index =only (:) print dup = } if
|
|
|
172 |
3 -1 roll begin
|
|
|
173 |
N exch sub dup 0 ge {
|
|
|
174 |
/N exch def N bitshift B add
|
|
|
175 |
} {
|
|
|
176 |
2 copy bitshift B add S exch write
|
|
|
177 |
% Stack: value -left
|
|
|
178 |
{ 8 add dup 0 ge { exit } if
|
|
|
179 |
2 copy bitshift 255 and S exch write
|
|
|
180 |
} loop
|
|
|
181 |
/N 1 index def bitshift 255 and
|
|
|
182 |
} ifelse /B exch def
|
|
|
183 |
end
|
|
|
184 |
} bind def
|
|
|
185 |
/bitflush { % <bstream> bitflush -
|
|
|
186 |
begin N 8 ne { S B write /B 0 def /N 8 def } if end
|
|
|
187 |
} bind def
|
|
|
188 |
|
|
|
189 |
/bwn { % <value> <width> bwn -
|
|
|
190 |
2 copy % v w v w
|
|
|
191 |
2 exch exp ge { % v w v>=2**w
|
|
|
192 |
/bwn cvx /rangecheck signalerror
|
|
|
193 |
} if
|
|
|
194 |
bits 3 1 roll bitwrite
|
|
|
195 |
} def
|
|
|
196 |
|
|
|
197 |
% Capture OFile output on the temporary file, in memory, or just as a length.
|
|
|
198 |
/totemp { % <proc> totemp <start> <end>
|
|
|
199 |
TFile fileposition OFile
|
|
|
200 |
/OFile TFile def 3 .execn
|
|
|
201 |
/OFile exch def
|
|
|
202 |
TFile fileposition
|
|
|
203 |
} bind def
|
|
|
204 |
/tomemory { % <proc> tomemory <string>
|
|
|
205 |
OFile /OFile mstream def 2 .execn
|
|
|
206 |
OFile mcontents exch /OFile exch def
|
|
|
207 |
} bind def
|
|
|
208 |
/tolength { % <proc> tolength <string>
|
|
|
209 |
OFile /OFile postream def 2 .execn
|
|
|
210 |
OFile poslength exch /OFile exch def
|
|
|
211 |
} bind def
|
|
|
212 |
|
|
|
213 |
% Copy a range of bytes from TFile to OFile.
|
|
|
214 |
/copyrange { % <start> <end> copybytes -
|
|
|
215 |
TFile 2 index setfileposition
|
|
|
216 |
exch sub 1024 string exch {
|
|
|
217 |
% Stack: buf left
|
|
|
218 |
2 copy 1 index length .min 0 exch getinterval
|
|
|
219 |
TFile exch readstring pop OFile exch writestring
|
|
|
220 |
1 index length sub dup 0 le { exit } if
|
|
|
221 |
} loop pop pop
|
|
|
222 |
} bind def
|
|
|
223 |
|
|
|
224 |
% Pad with blanks to a specified position.
|
|
|
225 |
/padto { % <pos> padto -
|
|
|
226 |
OFile fileposition sub
|
|
|
227 |
dup 0 lt {
|
|
|
228 |
(ERROR: file position incorrect by ) print =
|
|
|
229 |
/padto cvx /rangecheck signalerror
|
|
|
230 |
} {
|
|
|
231 |
{ ( ) ows } repeat
|
|
|
232 |
} ifelse
|
|
|
233 |
} bind def
|
|
|
234 |
|
|
|
235 |
% ---------------- Read objects into memory ---------------- %
|
|
|
236 |
|
|
|
237 |
/touch { % <object> touch -
|
|
|
238 |
{
|
|
|
239 |
{ touch touch } forall
|
|
|
240 |
} {
|
|
|
241 |
dup xcheck {
|
|
|
242 |
% Executable array, must be an indirect object.
|
|
|
243 |
dup 0 get resolved? { pop pop } { oforce touch } ifelse
|
|
|
244 |
} {
|
|
|
245 |
{ touch } forall
|
|
|
246 |
} ifelse
|
|
|
247 |
} {
|
|
|
248 |
pop
|
|
|
249 |
} ifdaelse
|
|
|
250 |
} bind def
|
|
|
251 |
|
|
|
252 |
% ---------------- Replace references with referents ---------------- %
|
|
|
253 |
|
|
|
254 |
/replaceable? { % <value> replaceable? <bool>
|
|
|
255 |
dup type /integertype eq exch xcheck not and
|
|
|
256 |
} bind def
|
|
|
257 |
/replacement { % <obj|ref> replacement <obj'>
|
|
|
258 |
dup oforce dup replaceable? { exch } if pop
|
|
|
259 |
} bind def
|
|
|
260 |
|
|
|
261 |
/replacerefs { % <object> replacerefs <object>
|
|
|
262 |
{
|
|
|
263 |
dup {
|
|
|
264 |
2 index 2 index undef
|
|
|
265 |
exch replacement exch replacement
|
|
|
266 |
2 index 3 1 roll put
|
|
|
267 |
} forall
|
|
|
268 |
} {
|
|
|
269 |
|
|
|
270 |
1 index exch 2 copy get replacement put
|
|
|
271 |
} for
|
|
|
272 |
} {
|
|
|
273 |
} ifdaelse
|
|
|
274 |
} bind def
|
|
|
275 |
|
|
|
276 |
/replaceReferences { % - replaceReferences -
|
|
|
277 |
Objects { replacerefs pop } lforall
|
|
|
278 |
% Delete replaced objects.
|
|
|
279 |
|
|
|
280 |
Objects 1 index lget replaceable? {
|
|
|
281 |
PDFOPTDEBUG { (Deleting ) print dup = } if
|
|
|
282 |
Generations 1 index 0 lput
|
|
|
283 |
} if pop
|
|
|
284 |
} for
|
|
|
285 |
} bind def
|
|
|
286 |
|
|
|
287 |
% ---------------- Create new objects ---------------- %
|
|
|
288 |
|
|
|
289 |
/createObjects { % [<obj>...] createObjects <firstobj#>
|
|
|
290 |
Objects llength dup
|
|
|
291 |
dup 3 index length add growPDFobjects
|
|
|
292 |
% Stack: objects objn objn
|
|
|
293 |
3 1 roll exch {
|
|
|
294 |
Objects 2 index 3 -1 roll lput
|
|
|
295 |
Generations 1 index 1 lput
|
|
|
296 |
1 add
|
|
|
297 |
} forall pop
|
|
|
298 |
} bind def
|
|
|
299 |
|
|
|
300 |
% ---------------- Propagate attributes ---------------- %
|
|
|
301 |
|
|
|
302 |
/nopropattrs <<
|
|
|
303 |
% Never propagate these.
|
|
|
304 |
/Type dup /Kids dup /Count dup /Parent dup
|
|
|
305 |
% Handle Resources specially.
|
|
|
306 |
/Resources dup
|
|
|
307 |
>> def
|
|
|
308 |
|
|
|
309 |
% Merge Resources.
|
|
|
310 |
/mergeres { % <fromdict> <todict> mergeres -
|
|
|
311 |
% Values in todict take priority over fromdict.
|
|
|
312 |
1 index /Resources .knownget {
|
|
|
313 |
1 index /Resources .knownget {
|
|
|
314 |
% Stack: fromdict todict fromres tores
|
|
|
315 |
exch oforce exch oforce
|
|
|
316 |
% todict's Resources may be shared, so make a copy.
|
|
|
317 |
dup length dict .copydict
|
|
|
318 |
exch {
|
|
|
319 |
% Stack: fromdict todict tores' fromkey fromvalue
|
|
|
320 |
2 index 2 index knownoget {
|
|
|
321 |
% Stack: fromdict todict tores' fromkey fromvalue tovalue
|
|
|
322 |
exch oforce exch
|
|
|
323 |
% ProcSet is an array, other types are dictionaries.
|
|
|
324 |
dup type /dicttype eq {
|
|
|
325 |
% Dictionary, not ProcSet.
|
|
|
326 |
exch dup length 2 index length add dict .copydict .copydict
|
|
|
327 |
} {
|
|
|
328 |
% Array or packed array, ProcSet.
|
|
|
329 |
% Use dictionaries to do the merge.
|
|
|
330 |
dup length 2 index length add dict begin
|
|
|
331 |
exch { dup def } forall { dup def } forall
|
|
|
332 |
mark currentdict end { pop } forall .packtomark
|
|
|
333 |
} ifelse
|
|
|
334 |
} if
|
|
|
335 |
2 index 3 1 roll put
|
|
|
336 |
} forall
|
|
|
337 |
} if /Resources exch put pop
|
|
|
338 |
} {
|
|
|
339 |
pop pop
|
|
|
340 |
} ifelse
|
|
|
341 |
} bind def
|
|
|
342 |
|
|
|
343 |
% Merge attributes other than Resources.
|
|
|
344 |
/mergeattrs { % <fromdict> <todict> mergeattrs <fromdict> <todict>
|
|
|
345 |
% Values in todict take priority over fromdict.
|
|
|
346 |
1 index {
|
|
|
347 |
% Stack: fromdict todict fromkey fromvalue
|
|
|
348 |
//nopropattrs 2 index known {
|
|
|
349 |
pop pop
|
|
|
350 |
} {
|
|
|
351 |
2 index 2 index known { pop pop } { 2 index 3 1 roll put } ifelse
|
|
|
352 |
} ifelse
|
|
|
353 |
} forall
|
|
|
354 |
} bind def
|
|
|
355 |
|
|
|
356 |
% Propagate attributes to a subtree.
|
|
|
357 |
/proppage { % <attrs> <subtree> proppage -
|
|
|
358 |
% We should be able to tell when we reach a leaf
|
|
|
359 |
% by finding a Type unequal to /Pages. Unfortunately,
|
|
|
360 |
% some files distributed by Adobe lack the Type key
|
|
|
361 |
% in some of the Pages nodes! Instead, we check for Kids.
|
|
|
362 |
dup /Kids knownoget {
|
|
|
363 |
% Accumulate inherited values.
|
|
|
364 |
3 1 roll
|
|
|
365 |
% Stack: kids attrs pagesnode
|
|
|
366 |
dup length dict .copydict mergeattrs
|
|
|
367 |
dup 3 1 roll mergeres
|
|
|
368 |
exch { oforce 1 index exch proppage } forall pop
|
|
|
369 |
} {
|
|
|
370 |
% Merge inherited values into the leaf.
|
|
|
371 |
mergeattrs mergeres
|
|
|
372 |
} ifelse
|
|
|
373 |
} bind def
|
|
|
374 |
|
|
|
375 |
% Propagate attributes to all pages.
|
|
|
376 |
/propagateAttributes { % - propagateAttributes -
|
|
|
377 |
|
|
|
378 |
} bind def
|
|
|
379 |
|
|
|
380 |
% ---------------- Identify document-level objects ---------------- %
|
|
|
381 |
|
|
|
382 |
/identifyDocumentObjects { % - identifyDocumentObjects <obj#s>
|
|
|
383 |
{
|
|
|
384 |
Trailer /Root omget
|
|
|
385 |
dup /PageMode .knownget { omvisit } if
|
|
|
386 |
% Don't allow omvisit to trace references to Page objects.
|
|
|
387 |
dup /OpenAction .knownget { omvisitnopage } if
|
|
|
388 |
Trailer /Encrypt .knownget { omvisit } if
|
|
|
389 |
dup /Threads .knownget {
|
|
|
390 |
omforce { omvisit } forall
|
|
|
391 |
} if
|
|
|
392 |
dup /AcroForm .knownget { omvisit } if
|
|
|
393 |
pop
|
|
|
394 |
} visited
|
|
|
395 |
} bind def
|
|
|
396 |
|
|
|
397 |
% ---------------- Identify the objects of each page ---------------- %
|
|
|
398 |
|
|
|
399 |
/identifyfont { % <fontref> identifyfont -
|
|
|
400 |
omforce {
|
|
|
401 |
exch /FontDescriptor eq {
|
|
|
402 |
omforce dup /Flags .knownget { 32 and 0 ne } { false } ifelse
|
|
|
403 |
exch {
|
|
|
404 |
exch dup dup /FontFile eq exch /FontFile2 eq or
|
|
|
405 |
exch /FontFile3 eq or 2 index and {
|
|
|
406 |
fontfiles exch dadd
|
|
|
407 |
} {
|
|
|
408 |
omvisit
|
|
|
409 |
} ifelse
|
|
|
410 |
} forall pop
|
|
|
411 |
} {
|
|
|
412 |
omvisit
|
|
|
413 |
} ifelse
|
|
|
414 |
} forall
|
|
|
415 |
} bind def
|
|
|
416 |
|
|
|
417 |
% Collect all the objects referenced from a page. The first object number
|
|
|
418 |
% (which may not be the smallest one) is that of the page object itself.
|
|
|
419 |
/identifyPageObjects { % <extra> <page#> identifyPageObjects <obj#s>
|
|
|
420 |
PDFOPTDEBUG {
|
|
|
421 |
(%Objects for page: ) print dup =
|
|
|
422 |
} if
|
|
|
423 |
pdffindpageref
|
|
|
424 |
dup 0 get 3 1 roll
|
|
|
425 |
4 dict begin
|
|
|
426 |
/images 10 darray def
|
|
|
427 |
/fontfiles 10 darray def
|
|
|
428 |
{
|
|
|
429 |
omforce
|
|
|
430 |
% Stack: pageobj# extra page
|
|
|
431 |
% Visit any extra objects if applicable.
|
|
|
432 |
exch omvisit
|
|
|
433 |
% Visit Annots, if any.
|
|
|
434 |
% We don't try to defer the drawing information.
|
|
|
435 |
dup /Annots .knownget { omvisit } if
|
|
|
436 |
% Visit beads.
|
|
|
437 |
dup /B .knownget { omvisit } if
|
|
|
438 |
% Visit resources dictionaries.
|
|
|
439 |
dup /Resources .knownget {
|
|
|
440 |
omforce dup {
|
|
|
441 |
% Visit the first-level Resource dictionaries.
|
|
|
442 |
omforce pop pop
|
|
|
443 |
} forall {
|
|
|
444 |
% Visit the resources themselves.
|
|
|
445 |
% Skip Image XObjects, and FontFile streams if the
|
|
|
446 |
% FontDescriptor Flags have bit 6 set.
|
|
|
447 |
% We don't try to visit the resources in the order in which
|
|
|
448 |
% the Contents stream(s) reference(s) them.
|
|
|
449 |
exch dup /XObject eq {
|
|
|
450 |
pop oforce {
|
|
|
451 |
dup oforce /Subtype get /Image eq {
|
|
|
452 |
images exch dadd
|
|
|
453 |
} {
|
|
|
454 |
omvisit
|
|
|
455 |
} ifelse pop
|
|
|
456 |
} forall
|
|
|
457 |
} {
|
|
|
458 |
/Font eq {
|
|
|
459 |
oforce { identifyfont pop } forall
|
|
|
460 |
} {
|
|
|
461 |
oforce omvisit
|
|
|
462 |
} ifelse
|
|
|
463 |
} ifelse
|
|
|
464 |
} forall
|
|
|
465 |
} if
|
|
|
466 |
% Visit the Contents stream(s).
|
|
|
467 |
dup /Contents .knownget { omvisit } if
|
|
|
468 |
% Visit Image XObjects. We don't try to visit them in
|
|
|
469 |
% reference order.
|
|
|
470 |
images { omvisit } daforall
|
|
|
471 |
% Visit FontFile streams. We don't try to visit them in
|
|
|
472 |
% reference order.
|
|
|
473 |
fontfiles { omvisit } daforall
|
|
|
474 |
pop
|
|
|
475 |
} visited end
|
|
|
476 |
% Stack: pageobj# obj#s_larray
|
|
|
477 |
[ 3 1 roll {
|
|
|
478 |
2 copy eq { pop } { exch } ifelse
|
|
|
479 |
} lforall counttomark 1 roll ]
|
|
|
480 |
PDFOPTDEBUG {
|
|
|
481 |
(%Objects = ) print dup === flush
|
|
|
482 |
} if
|
|
|
483 |
} bind def
|
|
|
484 |
|
|
|
485 |
% Identify the objects of the first page.
|
|
|
486 |
/identifyFirstPageObjects { % - identifyFirstPageObjects <obj#s>
|
|
|
487 |
Trailer /Root oget null
|
|
|
488 |
1 index /PageMode knownoget {
|
|
|
489 |
/UseOutlines eq {
|
|
|
490 |
1 index /Outlines knownoget { exch pop } if
|
|
|
491 |
} if
|
|
|
492 |
} if exch pop
|
|
|
493 |
1 identifyPageObjects
|
|
|
494 |
} bind def
|
|
|
495 |
|
|
|
496 |
% Identify the non-shared objects of the other pages, and the shared objects.
|
|
|
497 |
% Note that the page objects themselves may appear to be shared, because of
|
|
|
498 |
% references from Dest entries in annotations, but they must be treated as
|
|
|
499 |
% non-shared. Note also that some objects referenced on the first page may
|
|
|
500 |
% also be referenced from other pages.
|
|
|
501 |
/identifyOtherPageObjects { % - identifyOtherPageObjects [<pageobj#s> ...]
|
|
|
502 |
% <sharedobj#s>
|
|
|
503 |
4 dict begin
|
|
|
504 |
/marks lstring Objects llength lgrowto def
|
|
|
505 |
% Collect objects of other pages and identify sharing.
|
|
|
506 |
[ 2 1 pdfpagecount { null exch identifyPageObjects } for ]
|
|
|
507 |
dup {
|
|
|
508 |
{ marks exch 2 copy lget 1 add 254 .min lput } forall
|
|
|
509 |
} forall
|
|
|
510 |
% Mark document-level and first page objects.
|
|
|
511 |
CatalogNs { marks exch 255 lput } lforall
|
|
|
512 |
FirstPageNs { marks exch 255 lput } forall
|
|
|
513 |
% Mark the page objects themselves as non-shared.
|
|
|
514 |
dup {
|
|
|
515 |
|
|
|
516 |
} forall
|
|
|
517 |
% Collect the non-shared objects of each page.
|
|
|
518 |
dup
|
|
|
519 |
[ exch {
|
|
|
520 |
[ exch {
|
|
|
521 |
marks 1 index lget 1 ne { pop } if
|
|
|
522 |
} forall ]
|
|
|
523 |
} forall ]
|
|
|
524 |
% Collect the shared objects of each page.
|
|
|
525 |
exch
|
|
|
526 |
[ exch {
|
|
|
527 |
[ exch {
|
|
|
528 |
marks 1 index lget dup 1 le exch 255 eq or { pop } if
|
|
|
529 |
} forall ]
|
|
|
530 |
} forall ]
|
|
|
531 |
|
|
|
532 |
% Collect the shared objects.
|
|
|
533 |
[ 1 1 marks llength 1 sub {
|
|
|
534 |
marks 1 index lget dup 1 le exch 255 eq or { pop } if
|
|
|
535 |
} for ]
|
|
|
536 |
|
|
|
537 |
end
|
|
|
538 |
} bind def
|
|
|
539 |
|
|
|
540 |
% Identify objects not associated with any page.
|
|
|
541 |
/identifyNonPageObjects { % - identifyNonPageObjects <obj#s>
|
|
|
542 |
4 dict begin
|
|
|
543 |
/marks lstring Objects llength lgrowto def
|
|
|
544 |
|
|
|
545 |
LPDictN marks exch 1 lput
|
|
|
546 |
PHSN marks exch 1 lput
|
|
|
547 |
CatalogNs { marks exch 1 lput } lforall
|
|
|
548 |
FirstPageNs { marks exch 1 lput } forall
|
|
|
549 |
SharedNs { marks exch 1 lput } forall
|
|
|
550 |
OtherPageNs { { marks exch 1 lput } forall } forall
|
|
|
551 |
|
|
|
552 |
%****** PUT THESE IN A REASONABLE ORDER ******
|
|
|
553 |
/npobj larray
|
|
|
554 |
|
|
|
555 |
1 1 Objects llength 1 sub {
|
|
|
556 |
marks 1 index lget 0 eq {
|
|
|
557 |
Generations exch lget 0 ne { 1 add } if
|
|
|
558 |
} {
|
|
|
559 |
pop
|
|
|
560 |
} ifelse
|
|
|
561 |
} for
|
|
|
562 |
lgrowto def
|
|
|
563 |
|
|
|
564 |
|
|
|
565 |
1 1 Objects llength 1 sub {
|
|
|
566 |
marks 1 index lget 0 eq {
|
|
|
567 |
% i
|
|
|
568 |
Generations 1 index lget 0 ne {
|
|
|
569 |
% i
|
|
|
570 |
npobj 2 index % i nobj 0
|
|
|
571 |
3 -1 roll % nobj 0 i
|
|
|
572 |
lput 1 add
|
|
|
573 |
} {
|
|
|
574 |
pop
|
|
|
575 |
} ifelse
|
|
|
576 |
} {
|
|
|
577 |
pop
|
|
|
578 |
} ifelse
|
|
|
579 |
} for
|
|
|
580 |
pop
|
|
|
581 |
|
|
|
582 |
npobj
|
|
|
583 |
end
|
|
|
584 |
} bind def
|
|
|
585 |
|
|
|
586 |
% ---------------- Assign object numbers ---------------- %
|
|
|
587 |
|
|
|
588 |
% Assign object numbers to all objects that will be copied.
|
|
|
589 |
% Return the first (translated) object number in the First Page xref table.
|
|
|
590 |
/assignObjectNumbers { % - assignObjectNumbers -
|
|
|
591 |
OtherPageNs { { omap pop } forall } forall
|
|
|
592 |
SharedNs { omap pop } forall
|
|
|
593 |
NonPageNs { omap pop } lforall
|
|
|
594 |
% Assign object numbers for the First Page xref table last.
|
|
|
595 |
LPDictN omap % don't pop, this is the return value
|
|
|
596 |
CatalogNs { omap pop } lforall
|
|
|
597 |
FirstPageNs { omap pop } forall
|
|
|
598 |
PHSN omap pop
|
|
|
599 |
} bind def
|
|
|
600 |
|
|
|
601 |
% ---------------- Create the LPDict ---------------- %
|
|
|
602 |
|
|
|
603 |
% Create the contents of the LPDict.
|
|
|
604 |
/createLPDict { % <phsstart> <phsend> <firstpageend>
|
|
|
605 |
% <xref0start> <filelength> createLPDict -
|
|
|
606 |
LPDict
|
|
|
607 |
dup /Linearized 1 put
|
|
|
608 |
dup /L 4 -1 roll put % filelength
|
|
|
609 |
dup /T 4 -1 roll put % xref0start
|
|
|
610 |
dup /E 4 -1 roll put % firstpageend
|
|
|
611 |
dup /H 5 -2 roll 1 index sub 2 array astore put % phsstart, end-start
|
|
|
612 |
dup /O 1 pdffindpageref 0 get omap put
|
|
|
613 |
/N pdfpagecount put
|
|
|
614 |
} bind def
|
|
|
615 |
|
|
|
616 |
% ---------------- Adjust object positions ---------------- %
|
|
|
617 |
|
|
|
618 |
/adjustObjectPositions { % <boundary> <deltabelow> <deltaabove>
|
|
|
619 |
% adjustObjectPositions -
|
|
|
620 |
% Objects fall into 4 categories: LPDict, PHS, Catalog, and others.
|
|
|
621 |
% We handle the first two as special cases.
|
|
|
622 |
XRef {
|
|
|
623 |
% Stack: bdy below above key loc
|
|
|
624 |
dup 5 index ge { 2 } { 3 } ifelse index add
|
|
|
625 |
XRef 3 1 roll ld_put
|
|
|
626 |
} ld_forall pop pop pop
|
|
|
627 |
XRef LPDictN omap HeaderLength ld_put
|
|
|
628 |
XRef PHSN omap PHSStart ld_put
|
|
|
629 |
} bind def
|
|
|
630 |
|
|
|
631 |
% ---------------- Write the output file ---------------- %
|
|
|
632 |
|
|
|
633 |
% Write objects identified by object number.
|
|
|
634 |
/writeobjn { % <obj#> writeobjn -
|
|
|
635 |
Generations 1 index lget pdfwriteobj
|
|
|
636 |
} bind def
|
|
|
637 |
/writeobjns { % <obj#s> writeobjns -
|
|
|
638 |
{ writeobjn } forall
|
|
|
639 |
} bind def
|
|
|
640 |
/lwriteobjns { % <obj#s> writeobjns -
|
|
|
641 |
{ writeobjn } lforall
|
|
|
642 |
} bind def
|
|
|
643 |
|
|
|
644 |
% Write a part of the output file.
|
|
|
645 |
/writePart { % <proc> <label> writePart -
|
|
|
646 |
PDFOPTDEBUG {
|
|
|
647 |
dup print ( count=) print count =only ( start=) print
|
|
|
648 |
OFile { .fileposition } stopped { pop (???) } if =
|
|
|
649 |
2 .execn
|
|
|
650 |
print ( end=) print
|
|
|
651 |
OFile { .fileposition } stopped { pop (???) } if =
|
|
|
652 |
} {
|
|
|
653 |
pop exec
|
|
|
654 |
} ifelse
|
|
|
655 |
} bind def
|
|
|
656 |
|
|
|
657 |
% Write the header.
|
|
|
658 |
/writePart1 { % - writePart1 -
|
|
|
659 |
{
|
|
|
660 |
pdfwriteheader
|
|
|
661 |
} (part1) writePart
|
|
|
662 |
} bind def
|
|
|
663 |
|
|
|
664 |
% Write the linearization parameters dictionary.
|
|
|
665 |
/writePart2 { % - writePart2 -
|
|
|
666 |
{
|
|
|
667 |
LPDictN writeobjn
|
|
|
668 |
} (part2) writePart
|
|
|
669 |
} bind def
|
|
|
670 |
|
|
|
671 |
% Write the First Page xref table and trailer.
|
|
|
672 |
% Free variables: FirstPageXN.
|
|
|
673 |
/writePart3 { % <xrefstart> writePart3 -
|
|
|
674 |
{
|
|
|
675 |
FirstPageXN NObjects 1 add 1 index sub pdfwritexref
|
|
|
676 |
Trailer dup length 1 add dict copy
|
|
|
677 |
dup /Size NObjects 1 add put
|
|
|
678 |
dup /Prev 4 -1 roll put
|
|
|
679 |
pdfwritetrailer
|
|
|
680 |
|
|
|
681 |
} (part3) writePart
|
|
|
682 |
} bind def
|
|
|
683 |
|
|
|
684 |
% Write the Catalog and other required document-level objects.
|
|
|
685 |
% Free variables: CatalogNs.
|
|
|
686 |
/writePart4 { % - writePart4 -
|
|
|
687 |
{
|
|
|
688 |
CatalogNs lwriteobjns
|
|
|
689 |
} (part4) writePart
|
|
|
690 |
} bind def
|
|
|
691 |
|
|
|
692 |
% Write the Primary Hint Stream.
|
|
|
693 |
/writePart5 { % - writePart5 -
|
|
|
694 |
{
|
|
|
695 |
PHSN writeobjn
|
|
|
696 |
} (part5) writePart
|
|
|
697 |
} bind def
|
|
|
698 |
|
|
|
699 |
% Write the First Page's objects.
|
|
|
700 |
% Free variables: FirstPageNs.
|
|
|
701 |
/writePart6 { % - writePart6 -
|
|
|
702 |
{
|
|
|
703 |
FirstPageNs writeobjns
|
|
|
704 |
} (part6) writePart
|
|
|
705 |
} bind def
|
|
|
706 |
|
|
|
707 |
% Write the objects of other pages (Page + non-shared objects).
|
|
|
708 |
% Free variables: OtherPageNs.
|
|
|
709 |
/writePart7 { % - writePart7 <lengths>
|
|
|
710 |
{
|
|
|
711 |
[ OtherPageNs {
|
|
|
712 |
OFile fileposition exch
|
|
|
713 |
writeobjns OFile fileposition exch sub
|
|
|
714 |
} forall ]
|
|
|
715 |
} (part7) writePart
|
|
|
716 |
} bind def
|
|
|
717 |
|
|
|
718 |
% Write the shared objects of other pages.
|
|
|
719 |
% Free variables: SharedNs.
|
|
|
720 |
/writePart8 { % - writePart8 -
|
|
|
721 |
{
|
|
|
722 |
SharedNs writeobjns
|
|
|
723 |
} (part8) writePart
|
|
|
724 |
} bind def
|
|
|
725 |
|
|
|
726 |
% Write the other objects not associated with pages.
|
|
|
727 |
% Free variables: NonPageNs.
|
|
|
728 |
/writePart9 { % - writePart9 -
|
|
|
729 |
{
|
|
|
730 |
NonPageNs { writeobjn } lforall
|
|
|
731 |
} (part9) writePart
|
|
|
732 |
} bind def
|
|
|
733 |
|
|
|
734 |
% Write the main xref table and trailer.
|
|
|
735 |
% Free variables: FirstPageXN.
|
|
|
736 |
/writePart11xref { % writePart11 -
|
|
|
737 |
{
|
|
|
738 |
|
|
|
739 |
} (part11xref) writePart
|
|
|
740 |
} bind def
|
|
|
741 |
/writePart11rest { % <part3start> writePart11rest -
|
|
|
742 |
{
|
|
|
743 |
<< /Size FirstPageXN >> pdfwritetrailer
|
|
|
744 |
pdfwritestartxref
|
|
|
745 |
} (part11rest) writePart
|
|
|
746 |
} bind def
|
|
|
747 |
|
|
|
748 |
% ---------------- Write hint tables ---------------- %
|
|
|
749 |
|
|
|
750 |
/bitsneeded { % <maxvalue> bitsneeded <#bits>
|
|
|
751 |
|
|
|
752 |
} bind def
|
|
|
753 |
|
|
|
754 |
% Find the start and end of objects in the output.
|
|
|
755 |
/omstart { % <obj#> omstart <pos>
|
|
|
756 |
PDFOPTDEBUG { (start\() print dup =only } if
|
|
|
757 |
omap
|
|
|
758 |
PDFOPTDEBUG { (=>) print dup =only } if
|
|
|
759 |
XRef exch ld_get
|
|
|
760 |
PDFOPTDEBUG { (\) = ) print dup = } if
|
|
|
761 |
} bind def
|
|
|
762 |
/omend { % <obj#> omend <pos>
|
|
|
763 |
% The end of an object is the start of the next object.
|
|
|
764 |
% The caller must be sure that this object is not the last one
|
|
|
765 |
% in part 9.
|
|
|
766 |
PDFOPTDEBUG { (end\() print dup =only } if
|
|
|
767 |
omap
|
|
|
768 |
PDFOPTDEBUG { (=>) print dup =only } if
|
|
|
769 |
1 add
|
|
|
770 |
% Check that the requested object wasn't the last one in part 6:
|
|
|
771 |
% the next object in the output file is the first in part 7.
|
|
|
772 |
PHSN omap 1 index eq { pop 1 } if
|
|
|
773 |
XRef exch ld_get
|
|
|
774 |
PDFOPTDEBUG { (\) = ) print dup = } if
|
|
|
775 |
} bind def
|
|
|
776 |
/omlength { % <obj#> omlength <length>
|
|
|
777 |
dup omend exch omstart sub
|
|
|
778 |
} bind def
|
|
|
779 |
|
|
|
780 |
% Find the Contents of a page.
|
|
|
781 |
/contentsobjects { % <pagedict> contentsobjects <firstobj#> <lastobj#> true
|
|
|
782 |
% <pagedict> contentsobjects false
|
|
|
783 |
/Contents .knownget {
|
|
|
784 |
dup oforce % ref []
|
|
|
785 |
dup type /dicttype eq {
|
|
|
786 |
pop 0 get dup true % ref ref
|
|
|
787 |
} {
|
|
|
788 |
exch pop % []
|
|
|
789 |
dup length 0 ne {
|
|
|
790 |
dup 0 get 0 get % [] 1st
|
|
|
791 |
exch dup % 1st [] []
|
|
|
792 |
length 1 sub get 0 get % 1st last
|
|
|
793 |
true
|
|
|
794 |
} {
|
|
|
795 |
pop false
|
|
|
796 |
} ifelse
|
|
|
797 |
} ifelse
|
|
|
798 |
} {
|
|
|
799 |
false
|
|
|
800 |
} ifelse
|
|
|
801 |
} bind def
|
|
|
802 |
|
|
|
803 |
/contentsstart { % <pagedict> contentsstart <pos> true
|
|
|
804 |
% <pagedict> contentsstart false
|
|
|
805 |
contentsobjects { pop omstart true } { false } ifelse
|
|
|
806 |
} bind def
|
|
|
807 |
|
|
|
808 |
/contentslength { % <pagedict> contentslength <length>
|
|
|
809 |
contentsobjects { omend exch omstart sub } { 0 } ifelse
|
|
|
810 |
} bind def
|
|
|
811 |
|
|
|
812 |
|
|
|
813 |
/writePageOffsetHints {
|
|
|
814 |
PDFOPTDEBUG { /writePageOffsetHints == } if
|
|
|
815 |
20 dict begin
|
|
|
816 |
/bits OFile bitstream def
|
|
|
817 |
|
|
|
818 |
% Calculate least length of a page.
|
|
|
819 |
FirstPageLength OtherPageLengths { .min } forall
|
|
|
820 |
/minpl exch def
|
|
|
821 |
|
|
|
822 |
% Calculate least contents length.
|
|
|
823 |
FirstPageNs 0 get Objects exch lget contentslength
|
|
|
824 |
OtherPageNs { 0 get Objects exch lget contentslength .min } forall
|
|
|
825 |
/mincl exch def
|
|
|
826 |
|
|
|
827 |
% The Adobe documentation says that all versions of Acrobat
|
|
|
828 |
% require item 8 (mincl) to be zero. Patch this here.
|
|
|
829 |
/mincl 0 def
|
|
|
830 |
|
|
|
831 |
% Calculate bits needed to represent greatest page length.
|
|
|
832 |
FirstPageLength OtherPageLengths { .max } forall
|
|
|
833 |
minpl sub bitsneeded /maxplbits exch def
|
|
|
834 |
% Calculate bits needed to represent the greatest Contents length.
|
|
|
835 |
FirstPageNs 0 get Objects exch lget contentslength
|
|
|
836 |
OtherPageNs { 0 get Objects exch lget contentslength .max } forall
|
|
|
837 |
mincl sub bitsneeded /maxclbits exch def
|
|
|
838 |
|
|
|
839 |
% Per Adobe documentation, Acrobat requires that item 5 (maxplbits)
|
|
|
840 |
% be equal to item 9 (maxclbits). Set both to the max of the two.
|
|
|
841 |
maxplbits maxclbits .max /maxplbits 1 index def /maxclbits exch def
|
|
|
842 |
|
|
|
843 |
% Mapping from object number to shared object reference
|
|
|
844 |
/shared_id_dict FirstPageNs length SharedNs length add dict begin
|
|
|
845 |
|
|
|
846 |
SharedNs { 1 index def 1 add } forall
|
|
|
847 |
pop
|
|
|
848 |
currentdict end def
|
|
|
849 |
|
|
|
850 |
% Table F.3 Page offset hint table, header section
|
|
|
851 |
|
|
|
852 |
% 1: Least number of objects in a page:
|
|
|
853 |
FirstPageNs length OtherPageNs { length .min } forall
|
|
|
854 |
/minnop 1 index def 32 bwn
|
|
|
855 |
% 2: Location of first page's Page object:
|
|
|
856 |
FirstPageNs 0 get omap XRef exch ld_get 32 bwn
|
|
|
857 |
% 3: Bits needed to represent greatest # of objects in a page:
|
|
|
858 |
FirstPageNs length OtherPageNs { length .max } forall
|
|
|
859 |
minnop sub bitsneeded /maxnopbits 1 index def 16 bwn
|
|
|
860 |
% 4: Least length of a page:
|
|
|
861 |
minpl 32 bwn
|
|
|
862 |
% 5: Bits needed to represent the greatest page length:
|
|
|
863 |
maxplbits 16 bwn
|
|
|
864 |
% 6: Least start of Contents offset:
|
|
|
865 |
|
|
|
866 |
/minsco 1 index def 32 bwn
|
|
|
867 |
% 7: Bits needed to represent the greatest start of Contents
|
|
|
868 |
% offset:
|
|
|
869 |
|
|
|
870 |
/maxscobits 1 index def 16 bwn
|
|
|
871 |
% 8: Least contents length:
|
|
|
872 |
mincl 32 bwn
|
|
|
873 |
% 9: Bits needed to represent the greatest Contents length:
|
|
|
874 |
maxclbits 16 bwn
|
|
|
875 |
% 10: Bits needed to represent the greatest number of Shared
|
|
|
876 |
% Object references:
|
|
|
877 |
FirstPageNs length SharedPageNs { length .max } forall bitsneeded
|
|
|
878 |
/maxsorbits 1 index def 16 bwn
|
|
|
879 |
% 11: Bits needed to identify a Shared Object:
|
|
|
880 |
FirstPageNs length SharedNs length add bitsneeded
|
|
|
881 |
/sobits 1 index def 16 bwn
|
|
|
882 |
% 12: Bits needed to represent numerator of fraction:
|
|
|
883 |
2
|
|
|
884 |
/numfbits 1 index def 16 bwn
|
|
|
885 |
% 13: Denominator of fraction:
|
|
|
886 |
1
|
|
|
887 |
/denf 1 index def 16 bwn
|
|
|
888 |
|
|
|
889 |
% Table F.4 Page offset hint table, per-page entry
|
|
|
890 |
|
|
|
891 |
% 1: Number of objects in pages:
|
|
|
892 |
FirstPageNs length minnop sub maxnopbits bwn
|
|
|
893 |
OtherPageNs {
|
|
|
894 |
length minnop sub maxnopbits bwn
|
|
|
895 |
} forall
|
|
|
896 |
bits bitflush
|
|
|
897 |
|
|
|
898 |
% 2: Total length of pages in bytes;
|
|
|
899 |
FirstPageLength minpl sub maxplbits bwn
|
|
|
900 |
OtherPageLengths {
|
|
|
901 |
minpl sub maxplbits bwn
|
|
|
902 |
} forall
|
|
|
903 |
bits bitflush
|
|
|
904 |
|
|
|
905 |
% 3: Number of shared objects referenced from page:
|
|
|
906 |
FirstPageNs length maxsorbits bwn
|
|
|
907 |
SharedPageNs { length maxsorbits bwn } forall
|
|
|
908 |
bits bitflush
|
|
|
909 |
% 4: A shared object identifier:
|
|
|
910 |
FirstPageNs { shared_id_dict exch get sobits bwn } forall
|
|
|
911 |
SharedPageNs {
|
|
|
912 |
{ shared_id_dict exch get sobits bwn
|
|
|
913 |
} forall
|
|
|
914 |
} forall
|
|
|
915 |
bits bitflush
|
|
|
916 |
|
|
|
917 |
% 5: Numerator of fractional position for each shared object:
|
|
|
918 |
FirstPageNs { pop 0 numfbits bwn } forall
|
|
|
919 |
SharedPageNs {
|
|
|
920 |
{ pop 0 numfbits bwn
|
|
|
921 |
} forall
|
|
|
922 |
} forall
|
|
|
923 |
bits bitflush
|
|
|
924 |
|
|
|
925 |
% 6: Contents offsets:
|
|
|
926 |
% Following Implementation Note 133 section 6 is empty.
|
|
|
927 |
maxscobits 0 gt {
|
|
|
928 |
[FirstPageNs OtherPageNs aload pop] {
|
|
|
929 |
|
|
|
930 |
maxscobits bwn
|
|
|
931 |
} forall
|
|
|
932 |
bits bitflush
|
|
|
933 |
} if
|
|
|
934 |
|
|
|
935 |
% 7: Contents lengths:
|
|
|
936 |
[FirstPageNs OtherPageNs aload pop] {
|
|
|
937 |
|
|
|
938 |
} forall
|
|
|
939 |
bits bitflush
|
|
|
940 |
|
|
|
941 |
end
|
|
|
942 |
|
|
|
943 |
} bind def
|
|
|
944 |
|
|
|
945 |
/writeSharedObjectHints {
|
|
|
946 |
PDFOPTDEBUG { /writeSharedObjectHints == } if
|
|
|
947 |
20 dict begin
|
|
|
948 |
/bits OFile bitstream def
|
|
|
949 |
/obj_count SharedNs length FirstPageNs length add def
|
|
|
950 |
|
|
|
951 |
% Table F.5 Shared object hint table, header section
|
|
|
952 |
|
|
|
953 |
% 1: Object number of first object in Shared Objects section
|
|
|
954 |
|
|
|
955 |
% 2: Location of first object in Shared Objects section:
|
|
|
956 |
% If there are no shared objects,
|
|
|
957 |
% Acrobat sets this to the location of linearization
|
|
|
958 |
% parameters object (the very first object).
|
|
|
959 |
{ pdfwriteheader } tomemory length 32 bwn
|
|
|
960 |
% 3: Number of Shared Object entries for first page:
|
|
|
961 |
FirstPageNs length 32 bwn
|
|
|
962 |
% 4: Number of Shared Object entries for Shared Objects
|
|
|
963 |
% section
|
|
|
964 |
obj_count 32 bwn
|
|
|
965 |
% 5: Bits needed to represent the greatest number of objects
|
|
|
966 |
% in a shared object group (always 0, because all groups
|
|
|
967 |
% have only 1 object):
|
|
|
968 |
|
|
|
969 |
% 6: Least length of a Shared Object Group in bytes:
|
|
|
970 |
16#7fffffff FirstPageNs { omlength .min } forall
|
|
|
971 |
SharedNs { omlength .min } forall
|
|
|
972 |
/minsol 1 index def 32 bwn
|
|
|
973 |
% 7: Bits needed to represent the greatest length of a
|
|
|
974 |
% Shared Object Group:
|
|
|
975 |
|
|
|
976 |
SharedNs { omlength .max } forall
|
|
|
977 |
minsol sub bitsneeded
|
|
|
978 |
/maxsolbits 1 index def 16 bwn
|
|
|
979 |
|
|
|
980 |
% Table F.6 Shared object hint table, shared object group entry
|
|
|
981 |
|
|
|
982 |
% 1: Lengths of shared object groups:
|
|
|
983 |
FirstPageNs { omlength minsol sub maxsolbits bwn } forall
|
|
|
984 |
SharedNs { omlength minsol sub maxsolbits bwn } forall
|
|
|
985 |
bits bitflush
|
|
|
986 |
% 2: MD5 flag:
|
|
|
987 |
obj_count { 0 1 bwn } repeat
|
|
|
988 |
bits bitflush
|
|
|
989 |
% 3: No MD5 shared object signatures.
|
|
|
990 |
|
|
|
991 |
% 4: No number_number_of_objects_in_the_group - 1
|
|
|
992 |
end
|
|
|
993 |
} bind def
|
|
|
994 |
|
|
|
995 |
% ---------------- Main program ---------------- %
|
|
|
996 |
|
|
|
997 |
/pdfOptimize { % <infile> <outfile> pdfOptimize -
|
|
|
998 |
realtime 3 1 roll
|
|
|
999 |
exch pdfdict begin pdfopenfile dup begin
|
|
|
1000 |
40 dict begin
|
|
|
1001 |
/IDict exch def
|
|
|
1002 |
/OFile exch def
|
|
|
1003 |
/starttime exch def
|
|
|
1004 |
/now {
|
|
|
1005 |
QUIET { pop } { print (, t = ) print realtime starttime sub = flush } ifelse
|
|
|
1006 |
} def
|
|
|
1007 |
omapinit
|
|
|
1008 |
|
|
|
1009 |
% Create and open a temporary file.
|
|
|
1010 |
% Because of .setsafe, we have to open it as read-write, rather than
|
|
|
1011 |
% opening for writing, then closing it and reopening it for reading.
|
|
|
1012 |
|
|
|
1013 |
null (w+) .tempfile /TFile exch def /TFileName exch def
|
|
|
1014 |
.setsafe
|
|
|
1015 |
|
|
|
1016 |
% Read all objects into memory.
|
|
|
1017 |
|
|
|
1018 |
Trailer touch
|
|
|
1019 |
(Read objects) now
|
|
|
1020 |
|
|
|
1021 |
% Encrypted files are not yet supported.
|
|
|
1022 |
Trailer /Encrypt known {
|
|
|
1023 |
(ERROR: Encrypted files are not yet supported.) = flush
|
|
|
1024 |
/pdfOptimize cvx /limitcheck signalerror
|
|
|
1025 |
} if
|
|
|
1026 |
|
|
|
1027 |
% Replace indirect references to numbers. This is needed
|
|
|
1028 |
% for the Length of streams, and doesn't hurt anything else.
|
|
|
1029 |
|
|
|
1030 |
replaceReferences
|
|
|
1031 |
(Replaced references) now
|
|
|
1032 |
|
|
|
1033 |
% Create the two new objects: the linearization parameter
|
|
|
1034 |
% dictionary, and the Primary Hint Stream.
|
|
|
1035 |
|
|
|
1036 |
/LPDict 10 dict def
|
|
|
1037 |
/PHS 10 dict cvx def % executable = stream
|
|
|
1038 |
[LPDict PHS] createObjects
|
|
|
1039 |
/LPDictN 1 index def 1 add
|
|
|
1040 |
/PHSN exch def
|
|
|
1041 |
PDFOPTDEBUG { << /LPDictN LPDictN /PHSN PHSN >> === } if
|
|
|
1042 |
|
|
|
1043 |
% Count the number of objects in the output.
|
|
|
1044 |
|
|
|
1045 |
|
|
|
1046 |
Generations exch lget 0 ne { 1 add } if
|
|
|
1047 |
} for
|
|
|
1048 |
/NObjects exch def
|
|
|
1049 |
QUIET not { NObjects =only ( objects total) = flush } if
|
|
|
1050 |
|
|
|
1051 |
% Propagate inherited attributes down the page tree.
|
|
|
1052 |
|
|
|
1053 |
propagateAttributes
|
|
|
1054 |
(Propagated attributes) now
|
|
|
1055 |
|
|
|
1056 |
% Identify the document-level objects (part 4).
|
|
|
1057 |
|
|
|
1058 |
identifyDocumentObjects /CatalogNs exch def
|
|
|
1059 |
QUIET not { CatalogNs === flush } if
|
|
|
1060 |
(Identified Catalog) now
|
|
|
1061 |
|
|
|
1062 |
% Identify the first page's objects (part 6),
|
|
|
1063 |
% including the Outlines tree if appropriate.
|
|
|
1064 |
|
|
|
1065 |
pdfopencache
|
|
|
1066 |
/FirstPageNs identifyFirstPageObjects def
|
|
|
1067 |
QUIET not { FirstPageNs === flush } if
|
|
|
1068 |
(Identified first page) now
|
|
|
1069 |
|
|
|
1070 |
% Identify shared vs. non-shared objects for remaining pages
|
|
|
1071 |
% (parts 7 and 8).
|
|
|
1072 |
|
|
|
1073 |
identifyOtherPageObjects
|
|
|
1074 |
/SharedNs exch def
|
|
|
1075 |
/SharedPageNs exch def
|
|
|
1076 |
/OtherPageNs exch def
|
|
|
1077 |
QUIET not { OtherPageNs === flush SharedNs === flush } if
|
|
|
1078 |
(Identified other pages) now
|
|
|
1079 |
|
|
|
1080 |
% Identify objects not associated with any page (part 9).
|
|
|
1081 |
|
|
|
1082 |
/NonPageNs identifyNonPageObjects def
|
|
|
1083 |
QUIET not { NonPageNs { === } forall flush } if
|
|
|
1084 |
(Identified non-pages) now
|
|
|
1085 |
|
|
|
1086 |
% Assign final object numbers to all the objects.
|
|
|
1087 |
% (The omap is currently empty.)
|
|
|
1088 |
|
|
|
1089 |
/FirstPageXN assignObjectNumbers def
|
|
|
1090 |
(Assigned objects #s) now
|
|
|
1091 |
|
|
|
1092 |
% Write the document-level objects (part 4).
|
|
|
1093 |
|
|
|
1094 |
{ writePart4 } totemp
|
|
|
1095 |
/CatalogTempEnd exch def /CatalogTempStart exch def
|
|
|
1096 |
(Wrote Catalog) now
|
|
|
1097 |
|
|
|
1098 |
% Write the first page's objects (part 6).
|
|
|
1099 |
|
|
|
1100 |
{ writePart6 } totemp
|
|
|
1101 |
/FirstPageTempEnd exch def /FirstPageTempStart exch def
|
|
|
1102 |
(Wrote first page) now
|
|
|
1103 |
|
|
|
1104 |
% Write the non-shared objects for other pages (part 7).
|
|
|
1105 |
|
|
|
1106 |
{ writePart7 /OtherPageLengths exch def } totemp
|
|
|
1107 |
/OtherPageTempEnd exch def /OtherPageTempStart exch def
|
|
|
1108 |
(Wrote other pages) now
|
|
|
1109 |
|
|
|
1110 |
% Write the shared objects for other pages (part 8).
|
|
|
1111 |
|
|
|
1112 |
{ writePart8 } totemp
|
|
|
1113 |
/SharedTempEnd exch def /SharedTempStart exch def
|
|
|
1114 |
(Wrote shared objects) now
|
|
|
1115 |
|
|
|
1116 |
% Write the objects not associated with pages (part 9).
|
|
|
1117 |
|
|
|
1118 |
{ writePart9 } totemp
|
|
|
1119 |
/NonPageTempEnd exch def /NonPageTempStart exch def
|
|
|
1120 |
|
|
|
1121 |
% Compute conservative lengths of parts 2,3,5,11 of the output.
|
|
|
1122 |
% It's OK for these to be too large, but not too small.
|
|
|
1123 |
|
|
|
1124 |
% Make dummy XRef entres for LPDict and PHS.
|
|
|
1125 |
XRef LPDictN omap 0 ld_put
|
|
|
1126 |
XRef PHSN omap 0 ld_put
|
|
|
1127 |
|
|
|
1128 |
/HeaderLength { % this is exact
|
|
|
1129 |
writePart1 % part 1
|
|
|
1130 |
} tolength def
|
|
|
1131 |
/CatalogLength % this is exact
|
|
|
1132 |
CatalogTempEnd CatalogTempStart sub def % part 4
|
|
|
1133 |
/FirstPageLength % this is exact
|
|
|
1134 |
FirstPageTempEnd FirstPageTempStart sub def % part 6
|
|
|
1135 |
/OtherObjectsLength % this is exact
|
|
|
1136 |
NonPageTempEnd OtherPageTempStart sub def % parts 7,8,9
|
|
|
1137 |
/ObjectsLength % this is exact
|
|
|
1138 |
CatalogLength FirstPageLength add OtherObjectsLength add def
|
|
|
1139 |
/XrefLength { % part 11
|
|
|
1140 |
% The LPDict must end within the first 1024 bytes,
|
|
|
1141 |
% so the start of the FirstPage xref table can't exceed 1024.
|
|
|
1142 |
writePart11xref 1024 writePart11rest
|
|
|
1143 |
} tolength def
|
|
|
1144 |
/NominalFileLength % Make a generous allowance for parts 2,3,5.
|
|
|
1145 |
HeaderLength ObjectsLength 3 mul add 10000 add 99999 .max def
|
|
|
1146 |
/FirstPageXrefLength { % part 3
|
|
|
1147 |
NominalFileLength writePart3
|
|
|
1148 |
} tolength def
|
|
|
1149 |
/LPDictLength { % part 2
|
|
|
1150 |
NominalFileLength dup 2 mul 2 copy add 1 index dup createLPDict writePart2
|
|
|
1151 |
} tolength def
|
|
|
1152 |
|
|
|
1153 |
% Compute a few additional values from the above.
|
|
|
1154 |
|
|
|
1155 |
/XrefBeginLength {
|
|
|
1156 |
(xref\n0 ) ows
|
|
|
1157 |
OFile FirstPageXN write=
|
|
|
1158 |
} tolength def
|
|
|
1159 |
HeaderLength LPDictLength add
|
|
|
1160 |
/FirstPageXrefStart 1 index def
|
|
|
1161 |
FirstPageXrefLength add
|
|
|
1162 |
/CatalogStart 1 index def
|
|
|
1163 |
CatalogLength add % phsstart
|
|
|
1164 |
/PHSStart exch def
|
|
|
1165 |
|
|
|
1166 |
% Adjust the object positions ignoring PHS.
|
|
|
1167 |
% (Writing the PHS needs these.)
|
|
|
1168 |
|
|
|
1169 |
|
|
|
1170 |
% Make a temporary XRef entry for the PHS, for the benefit of omend.
|
|
|
1171 |
XRef PHSN omap CatalogStart ld_put
|
|
|
1172 |
(Adjusted positions) now
|
|
|
1173 |
|
|
|
1174 |
% Construct the hint tables (part 5).
|
|
|
1175 |
|
|
|
1176 |
{ writePageOffsetHints } totemp
|
|
|
1177 |
pop /PHSTempStart exch def
|
|
|
1178 |
{ writeSharedObjectHints } totemp
|
|
|
1179 |
exch PHSTempStart sub PHS /S 3 -1 roll put
|
|
|
1180 |
PHSTempStart sub /PHSTempLength exch def
|
|
|
1181 |
(Wrote hints) now
|
|
|
1182 |
|
|
|
1183 |
% Prepare to read TFile.
|
|
|
1184 |
% TFile closefile
|
|
|
1185 |
% /TFile TFileName (r) file def
|
|
|
1186 |
|
|
|
1187 |
PHS
|
|
|
1188 |
dup /File TFile put
|
|
|
1189 |
dup /FilePosition PHSTempStart put
|
|
|
1190 |
dup /Length PHSTempLength put
|
|
|
1191 |
pop
|
|
|
1192 |
/PHSLength { writePart5 } tolength def
|
|
|
1193 |
|
|
|
1194 |
% Construct the linearization parameter dictionary (part 2).
|
|
|
1195 |
|
|
|
1196 |
PHSStart
|
|
|
1197 |
dup PHSLength add % phsend
|
|
|
1198 |
/FirstPageStart 1 index def
|
|
|
1199 |
dup FirstPageLength add % firstpageend
|
|
|
1200 |
dup OtherObjectsLength add
|
|
|
1201 |
/XrefStart 1 index def
|
|
|
1202 |
XrefBeginLength add % xref0start
|
|
|
1203 |
dup XrefBeginLength sub XrefLength add % fileend
|
|
|
1204 |
% Because of a bug, Acrobat Reader doesn't recognize any file
|
|
|
1205 |
% shorter than 1K as linearized. Patch this here.
|
|
|
1206 |
1024 .max
|
|
|
1207 |
/FileLength 1 index def
|
|
|
1208 |
createLPDict
|
|
|
1209 |
|
|
|
1210 |
% Adjust the object positions again, taking the PHS into account.
|
|
|
1211 |
|
|
|
1212 |
PHSStart 0 PHSLength adjustObjectPositions
|
|
|
1213 |
(Readjusted positions) now
|
|
|
1214 |
|
|
|
1215 |
% Finally, write the output file.
|
|
|
1216 |
|
|
|
1217 |
writePart1
|
|
|
1218 |
writePart2
|
|
|
1219 |
FirstPageXrefStart padto
|
|
|
1220 |
XrefStart writePart3
|
|
|
1221 |
CatalogStart padto
|
|
|
1222 |
CatalogTempStart CatalogTempEnd copyrange % part 4
|
|
|
1223 |
writePart5
|
|
|
1224 |
FirstPageStart padto
|
|
|
1225 |
FirstPageTempStart NonPageTempEnd copyrange % parts 6,7,8,9
|
|
|
1226 |
% No Overflow Hint Stream (part 10).
|
|
|
1227 |
XrefStart padto
|
|
|
1228 |
writePart11xref
|
|
|
1229 |
{ FirstPageXrefStart writePart11rest } tomemory
|
|
|
1230 |
FileLength 1 index length sub padto ows
|
|
|
1231 |
(Wrote output file) now
|
|
|
1232 |
|
|
|
1233 |
% Wrap up.
|
|
|
1234 |
|
|
|
1235 |
TFile closefile TFileName deletefile
|
|
|
1236 |
end % temporary dict
|
|
|
1237 |
end % IDict
|
|
|
1238 |
} bind def
|
|
|
1239 |
|
|
|
1240 |
end % pdfoptdict
|
|
|
1241 |
.setglobal
|
|
|
1242 |
|
|
|
1243 |
% Check for command line arguments.
|
|
|
1244 |
[ shellarguments {
|
|
|
1245 |
] dup length 2 eq {
|
|
|
1246 |
% Load the pdfwrite utilities if necessary.
|
|
|
1247 |
/omapinit where { pop } { (pdfwrite.ps) runlibfile } ifelse
|
|
|
1248 |
save exch
|
|
|
1249 |
aload pop exch (r) file exch (w) file
|
|
|
1250 |
3000000 setvmthreshold
|
|
|
1251 |
|
|
|
1252 |
pdfoptdict begin pdfOptimize end
|
|
|
1253 |
restore
|
|
|
1254 |
} {
|
|
|
1255 |
(Usage: gs -dNODISPLAY -- pdfopt.ps input.pdf output.pdf) = flush quit
|
|
|
1256 |
} ifelse
|
|
|
1257 |
} {
|
|
|
1258 |
pop
|
|
|
1259 |
} ifelse
|