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
|
/* $Header: /home/cvsroot/dvipdfmx/src/epdf.c,v 1.16 2007/11/14 03:12:21 chofchof Exp $
This is dvipdfmx, an eXtended version of dvipdfm by Mark A. Wicks.
Copyright (C) 2007 by Jin-Hwan Cho and Shunsaku Hirata,
the dvipdfmx project team <dvipdfmx@project.ktug.or.kr>
Copyright (C) 1998, 1999 by Mark A. Wicks <mwicks@kettering.edu>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
/*
* Concatinating content streams are only supported for streams that only uses
* single FlateDecode filter, i.e.,
*
* /Filter /FlateDecode or /Filter [/FlateDecode]
*
* TrimBox, BleedBox, ArtBox, Rotate ...
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include "system.h"
#include "mem.h"
#include "mfileio.h"
#include "error.h"
#if HAVE_ZLIB
#include <zlib.h>
#endif
#include "pdfobj.h"
#include "pdfdev.h"
#include "pdfximage.h"
#include "epdf.h"
#if HAVE_ZLIB
static int add_stream_flate (pdf_obj *dst, const void *data, long len);
#endif
static int concat_stream (pdf_obj *dst, pdf_obj *src);
static void print_bbox_info (pdf_obj *rect, const char *type, pdf_obj *crop_box);
static int rect_equal (pdf_obj *rect1, pdf_obj *rect2);
/*
* From PDFReference15_v6.pdf (p.119 and p.834)
*
* MediaBox rectangle (Required; inheritable)
*
* The media box defines the boundaries of the physical medium on which the
* page is to be printed. It may include any extended area surrounding the
* finished page for bleed, printing marks, or other such purposes. It may
* also include areas close to the edges of the medium that cannot be marked
* because of physical limitations of the output device. Content falling
* outside this boundary can safely be discarded without affecting the
* meaning of the PDF file.
*
* CropBox rectangle (Optional; inheritable)
*
* The crop box defines the region to which the contents of the page are to be
* clipped (cropped) when displayed or printed. Unlike the other boxes, the
* crop box has no defined meaning in terms of physical page geometry or
* intended use; it merely imposes clipping on the page contents. However,
* in the absence of additional information (such as imposition instructions
* specified in a JDF or PJTF job ticket), the crop box will determine how
* the page’s contents are to be positioned on the output medium. The default
* value is the page’s media box.
*
* BleedBox rectangle (Optional; PDF 1.3)
*
* The bleed box (PDF 1.3) defines the region to which the contents of the
* page should be clipped when output in a production environment. This may
* include any extra “bleed area” needed to accommodate the physical
* limitations of cutting, folding, and trimming equipment. The actual printed
* page may include printing marks that fall outside the bleed box.
* The default value is the page’s crop box.
*
* TrimBox rectangle (Optional; PDF 1.3)
*
* The trim box (PDF 1.3) defines the intended dimensions of the finished page
* after trimming. It may be smaller than the media box, to allow for
* production-related content such as printing instructions, cut marks, or
* color bars. The default value is the page’s crop box.
*
* ArtBox rectangle (Optional; PDF 1.3)
*
* The art box (PDF 1.3) defines the extent of the page’s meaningful content
* (including potential white space) as intended by the page’s creator.
* The default value is the page’s crop box.
*
* Rotate integer (Optional; inheritable)
*
* The number of degrees by which the page should be rotated clockwise when
* displayed or printed. The value must be a multiple of 90. Default value: 0.
*/
static int
rect_equal (pdf_obj *rect1, pdf_obj *rect2)
{
int i;
if (!rect1 || !rect2)
return 0;
for (i = 0; i < 4; i++) {
if (pdf_number_value(pdf_get_array(rect1, i)) !=
pdf_number_value(pdf_get_array(rect2, i)))
return 0;
}
return 1;
}
static void
print_bbox_info (pdf_obj *rect, const char *type, pdf_obj *crop_box)
{
WARN("\"%s\" different from current CropBox found.", type);
WARN("%s (PDF): [ %g %g %g %g ]", type,
pdf_number_value(pdf_get_array(rect, 0)),
pdf_number_value(pdf_get_array(rect, 1)),
pdf_number_value(pdf_get_array(rect, 2)),
pdf_number_value(pdf_get_array(rect, 3)));
WARN("CropBox/MediaBox (PDF) : [ %g %g %g %g ]",
pdf_number_value(pdf_get_array(crop_box, 0)),
pdf_number_value(pdf_get_array(crop_box, 1)),
pdf_number_value(pdf_get_array(crop_box, 2)),
pdf_number_value(pdf_get_array(crop_box, 3)));
}
int
pdf_include_page (pdf_ximage *ximage, FILE *image_file)
{
xform_info info;
pdf_obj *contents, *contents_ref, *contents_dict;
pdf_obj *page_tree;
pdf_obj *bbox, *resources, *rotate, *matrix;
pdf_ximage_init_form_info(&info);
/*
* Get Page Tree.
*/
page_tree = NULL;
{
pdf_obj *trailer, *catalog;
pdf_obj *markinfo, *tmp;
trailer = pdf_open(image_file);
if (!trailer) {
WARN("Trailer not found! Corrupt PDF file?");
pdf_close();
return -1;
}
if (pdf_lookup_dict(trailer, "Encrypt")) {
WARN("This PDF document is encrypted.");
pdf_release_obj(trailer);
pdf_close();
return -1;
}
catalog = pdf_deref_obj(pdf_lookup_dict(trailer, "Root"));
if (!catalog) {
WARN("Catalog isn't where I expect it.");
pdf_close();
return -1;
}
pdf_release_obj(trailer);
markinfo = pdf_deref_obj(pdf_lookup_dict(catalog, "MarkInfo"));
if (markinfo) {
tmp = pdf_lookup_dict(markinfo, "Marked");
pdf_release_obj(markinfo);
if (tmp && pdf_boolean_value(tmp)) {
WARN("Tagged PDF not supported.");
pdf_release_obj(catalog);
pdf_close();
return -1;
}
}
page_tree = pdf_deref_obj(pdf_lookup_dict(catalog, "Pages"));
pdf_release_obj(catalog);
}
if (!page_tree) {
WARN("Page tree not found.");
pdf_close();
return -1;
}
/*
* Seek first page. Get Media/Crop Box.
* Media box and resources can be inherited.
*/
{
pdf_obj *kids_ref, *kids;
pdf_obj *crop_box;
pdf_obj *tmp;
tmp = pdf_lookup_dict(page_tree, "MediaBox");
bbox = tmp ? pdf_deref_obj(tmp) : NULL;
tmp = pdf_lookup_dict(page_tree, "CropBox");
crop_box = tmp ? pdf_deref_obj(tmp) : NULL;
tmp = pdf_lookup_dict(page_tree, "Rotate");
rotate = tmp ? pdf_deref_obj(tmp) : NULL;
tmp = pdf_lookup_dict(page_tree, "Resources");
resources = tmp ? pdf_deref_obj(tmp) : pdf_new_dict();
while ((kids_ref = pdf_lookup_dict(page_tree, "Kids")) != NULL) {
kids = pdf_deref_obj(kids_ref);
pdf_release_obj(page_tree);
page_tree = pdf_deref_obj(pdf_get_array(kids, 0));
pdf_release_obj(kids);
if ((tmp = pdf_deref_obj(pdf_lookup_dict(page_tree, "MediaBox")))) {
if (bbox)
pdf_release_obj(bbox);
bbox = tmp;
}
if ((tmp = pdf_deref_obj(pdf_lookup_dict(page_tree, "BleedBox")))) {
if (!rect_equal(tmp, bbox)) {
if (bbox)
pdf_release_obj(bbox);
bbox = tmp;
}
}
if ((tmp = pdf_deref_obj(pdf_lookup_dict(page_tree, "TrimBox")))) {
if (!rect_equal(tmp, bbox)) {
if (bbox)
pdf_release_obj(bbox);
bbox = tmp;
}
}
if ((tmp = pdf_deref_obj(pdf_lookup_dict(page_tree, "ArtBox")))) {
if (!rect_equal(tmp, bbox)) {
if (bbox)
pdf_release_obj(bbox);
bbox = tmp;
}
}
if ((tmp = pdf_deref_obj(pdf_lookup_dict(page_tree, "CropBox")))) {
if (crop_box)
pdf_release_obj(crop_box);
crop_box = tmp;
}
if ((tmp = pdf_deref_obj(pdf_lookup_dict(page_tree, "Rotate")))) {
if (rotate)
pdf_release_obj(rotate);
rotate = tmp;
}
if ((tmp = pdf_deref_obj(pdf_lookup_dict(page_tree, "Resources")))) {
#if 0
pdf_merge_dict(tmp, resources);
#endif
if (resources)
pdf_release_obj(resources);
resources = tmp;
}
}
if (crop_box) {
pdf_release_obj(bbox);
bbox = crop_box;
}
}
if (!bbox) {
WARN("No BoundingBox information available.");
pdf_release_obj(page_tree);
pdf_release_obj(resources);
if (rotate)
pdf_release_obj(rotate);
pdf_close();
return -1;
}
if (rotate) {
if (pdf_number_value(rotate) != 0.0)
WARN("<< /Rotate %d >> found. (Not supported yet)", (int)pdf_number_value(rotate));
pdf_release_obj(rotate);
rotate = NULL;
}
info.bbox.llx = pdf_number_value(pdf_get_array(bbox, 0));
info.bbox.lly = pdf_number_value(pdf_get_array(bbox, 1));
info.bbox.urx = pdf_number_value(pdf_get_array(bbox, 2));
info.bbox.ury = pdf_number_value(pdf_get_array(bbox, 3));
/*
* Handle page content stream.
* page_tree is now set to the first page.
*/
contents_ref = contents = NULL;
{
contents = pdf_deref_obj(pdf_lookup_dict(page_tree, "Contents"));
pdf_release_obj(page_tree);
if (!contents) {
pdf_release_obj(bbox);
pdf_close();
return -1;
}
/*
* Concatinate all content streams.
*/
if (PDF_OBJ_ARRAYTYPE(contents)) {
pdf_obj *content_seg, *content_new;
int idx = 0;
content_new = pdf_new_stream(STREAM_COMPRESS);
for (;;) {
content_seg = pdf_deref_obj(pdf_get_array(contents, idx));
if (!content_seg)
break;
else if (PDF_OBJ_NULLTYPE(content_seg)) {
/* Silently ignore. */
} else if (!PDF_OBJ_STREAMTYPE(content_seg)) {
WARN("Page content not a stream object. Broken PDF file?");
pdf_release_obj(content_new);
pdf_release_obj(bbox);
pdf_close();
return -1;
} else if (concat_stream(content_new, content_seg) < 0) {
WARN("Could not handle content stream with multiple segment.");
pdf_release_obj(content_new);
pdf_release_obj(bbox);
pdf_close();
return -1;
}
pdf_release_obj(content_seg);
idx++;
}
pdf_release_obj(contents);
contents = content_new;
}
if (!contents) {
pdf_release_obj(bbox);
pdf_close();
return -1;
}
}
{
pdf_obj *tmp;
tmp = pdf_import_object(resources);
pdf_release_obj(resources);
resources = tmp;
}
pdf_close();
contents_dict = pdf_stream_dict(contents);
pdf_add_dict(contents_dict,
pdf_new_name("Type"),
pdf_new_name("XObject"));
pdf_add_dict(contents_dict,
pdf_new_name("Subtype"),
pdf_new_name("Form"));
pdf_add_dict(contents_dict,
pdf_new_name("FormType"),
pdf_new_number(1.0));
pdf_add_dict(contents_dict, pdf_new_name("BBox"), bbox);
matrix = pdf_new_array();
pdf_add_array(matrix, pdf_new_number(1.0));
pdf_add_array(matrix, pdf_new_number(0.0));
pdf_add_array(matrix, pdf_new_number(0.0));
pdf_add_array(matrix, pdf_new_number(1.0));
pdf_add_array(matrix, pdf_new_number(0.0));
pdf_add_array(matrix, pdf_new_number(0.0));
pdf_add_dict(contents_dict, pdf_new_name("Matrix"), matrix);
pdf_add_dict(contents_dict, pdf_new_name("Resources"), resources);
pdf_ximage_set_form(ximage, &info, contents);
return 0;
}
#define WBUF_SIZE 4096
#if HAVE_ZLIB
static int
add_stream_flate (pdf_obj *dst, const void *data, long len)
{
z_stream z;
Bytef wbuf[WBUF_SIZE];
z.zalloc = Z_NULL; z.zfree = Z_NULL; z.opaque = Z_NULL;
z.next_in = (Bytef *) data; z.avail_in = len;
z.next_out = (Bytef *) wbuf; z.avail_out = WBUF_SIZE;
if (inflateInit(&z) != Z_OK) {
WARN("inflateInit() failed.");
return -1;
}
for (;;) {
int status;
status = inflate(&z, Z_NO_FLUSH);
if (status == Z_STREAM_END)
break;
else if (status != Z_OK) {
WARN("inflate() failed. Broken PDF file?");
inflateEnd(&z);
return -1;
}
if (z.avail_out == 0) {
pdf_add_stream(dst, wbuf, WBUF_SIZE);
z.next_out = wbuf;
z.avail_out = WBUF_SIZE;
}
}
if (WBUF_SIZE - z.avail_out > 0)
pdf_add_stream(dst, wbuf, WBUF_SIZE - z.avail_out);
return (inflateEnd(&z) == Z_OK ? 0 : -1);
}
#endif
static int
concat_stream (pdf_obj *dst, pdf_obj *src)
{
const char *stream_data;
long stream_length;
pdf_obj *stream_dict;
pdf_obj *filter;
if (!PDF_OBJ_STREAMTYPE(dst) || !PDF_OBJ_STREAMTYPE(src))
ERROR("Invalid type.");
stream_data = pdf_stream_dataptr(src);
stream_length = pdf_stream_length (src);
stream_dict = pdf_stream_dict (src);
if (pdf_lookup_dict(stream_dict, "DecodeParms")) {
WARN("DecodeParams not supported.");
return -1;
}
filter = pdf_lookup_dict(stream_dict, "Filter");
if (!filter) {
pdf_add_stream(dst, stream_data, stream_length);
return 0;
#if HAVE_ZLIB
} else {
char *filter_name;
if (PDF_OBJ_NAMETYPE(filter)) {
filter_name = pdf_name_value(filter);
if (filter_name && !strcmp(filter_name, "FlateDecode"))
return add_stream_flate(dst, stream_data, stream_length);
else {
WARN("DecodeFilter \"%s\" not supported.", filter_name);
return -1;
}
} else if (PDF_OBJ_ARRAYTYPE(filter)) {
if (pdf_array_length(filter) > 1) {
WARN("Multiple DecodeFilter not supported.");
return -1;
} else {
filter_name = pdf_name_value(pdf_get_array(filter, 0));
if (filter_name && !strcmp(filter_name, "FlateDecode"))
return add_stream_flate(dst, stream_data, stream_length);
else {
WARN("DecodeFilter \"%s\" not supported.", filter_name);
return -1;
}
}
} else
ERROR("Broken PDF file?");
#endif /* HAVE_ZLIB */
}
return -1;
}
|