summaryrefslogtreecommitdiff
path: root/Build/source/texk/web2c/luatexdir/image/pdftoepdf.w
blob: 1ece3a2dd489c92c507307c0bb2955b94285560a (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
% pdftoepdf.w
%
% Copyright 1996-2006 Han The Thanh <thanh@@pdftex.org>
% Copyright 2006-2015 Taco Hoekwater <taco@@luatex.org>
%
% This file is part of LuaTeX.
%
% LuaTeX 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.
%
% LuaTeX 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 Lesser General Public
% License for more details.
%
% You should have received a copy of the GNU General Public License along
% with LuaTeX; if not, see <http://www.gnu.org/licenses/>.

@ @c


// define DEBUG
#define __STDC_FORMAT_MACROS /* for PRId64 etc.  */

#include "image/epdf.h"

// This file is mostly C and not very much C++; it's just used to interface
// the functions of poppler, which happens to be written in C++.

extern void md5(Guchar *msg, int msgLen, Guchar *digest);

static GBool isInit = gFalse;

//**********************************************************************
// Maintain AVL tree of all PDF files for embedding

static avl_table *PdfDocumentTree = NULL;

// AVL sort PdfDocument into PdfDocumentTree by file_path

static int CompPdfDocument(const void *pa, const void *pb, void * /*p */ )
{
    return strcmp(((const PdfDocument *) pa)->file_path,
                  ((const PdfDocument *) pb)->file_path);
}

// Returns pointer to PdfDocument structure for PDF file.

static PdfDocument *findPdfDocument(char *file_path)
{
    PdfDocument *pdf_doc, tmp;
    assert(file_path != NULL);
    if (PdfDocumentTree == NULL)
        return NULL;
    tmp.file_path = file_path;
    pdf_doc = (PdfDocument *) avl_find(PdfDocumentTree, &tmp);
    return pdf_doc;
}

#define PDF_CHECKSUM_SIZE 32

static char *get_file_checksum(const char *a, file_error_mode fe)
{
    struct stat finfo;
    char *ck = NULL;
    if (stat(a, &finfo) == 0) {
        off_t size = finfo.st_size;
        time_t mtime = finfo.st_mtime;
        ck = (char *) malloc(PDF_CHECKSUM_SIZE);
        if (ck == NULL)
            luatex_fail("PDF inclusion: out of memory while processing '%s'",
                        a);
        snprintf(ck, PDF_CHECKSUM_SIZE, "%" PRIu64 "_%" PRIu64, (uint64_t) size,
                 (uint64_t) mtime);
   } else {
        switch (fe) {
        case FE_FAIL:
            luatex_fail("PDF inclusion: could not stat() file '%s'", a);
            break;
        case FE_RETURN_NULL:
            if (ck != NULL)
                free(ck);
            ck = NULL;
            break;
        default:
            assert(0);
        }
    }
    return ck;
}


static char *get_stream_checksum (const char *str, unsigned long long str_size){
  /* http://www.cse.yorku.ca/~oz/hash.html */
  /* djb2                                  */
  unsigned long hash ;
  char *ck = NULL;
  unsigned int i;
  hash = 5381;
  ck = (char *) malloc(STRSTREAM_CHECKSUM_SIZE+1);
  if (ck == NULL)
    luatex_fail("PDF inclusion: out of memory while processing a memstream");
  for(i=0; i<(unsigned int)(str_size); i++) {
    hash = ((hash << 5) + hash) + str[i]; /* hash * 33 + str[i] */
  }
  snprintf(ck,STRSTREAM_CHECKSUM_SIZE+1,"%lx",hash);
  ck[STRSTREAM_CHECKSUM_SIZE]='\0';
  return ck;
}



// Returns pointer to PdfDocument structure for PDF file.
// Creates a new PdfDocument structure if it doesn't exist yet.
// When fe = FE_RETURN_NULL, the function returns NULL in error case.

PdfDocument *refPdfDocument(const char *file_path, file_error_mode fe)
{
    char *checksum, *path_copy;
    PdfDocument *pdf_doc;
    PDFDoc *doc = NULL;
    GooString *docName = NULL;
    int new_flag = 0;
    if ((checksum = get_file_checksum(file_path, fe)) == NULL) {
        assert(fe == FE_RETURN_NULL);
        return (PdfDocument *) NULL;
    }
    assert(checksum != NULL);
    path_copy = xstrdup(file_path);
    if ((pdf_doc = findPdfDocument(path_copy)) == NULL) {
#ifdef DEBUG
        fprintf(stderr, "\nDEBUG: New PdfDocument %s\n", file_path);
#endif
        new_flag = 1;
        pdf_doc = new PdfDocument;
        pdf_doc->file_path = path_copy;
        pdf_doc->checksum = checksum;
        pdf_doc->doc = NULL;
        pdf_doc->inObjList = NULL;
        pdf_doc->ObjMapTree = NULL;
        pdf_doc->occurences = 0;        // 0 = unreferenced
        pdf_doc->pc = 0;
    } else {
#ifdef DEBUG
        fprintf(stderr, "\nDEBUG: Found PdfDocument %s (%d)\n",
                pdf_doc->file_path, pdf_doc->occurences);
#endif
        assert(pdf_doc->checksum != NULL);
        if (strncmp(pdf_doc->checksum, checksum, PDF_CHECKSUM_SIZE) != 0) {
            luatex_fail("PDF inclusion: file has changed '%s'", file_path);
        }
        free(checksum);
        free(path_copy);
    }
    assert(pdf_doc != NULL);
    if (pdf_doc->doc == NULL) {
#ifdef DEBUG
        fprintf(stderr, "\nDEBUG: New PDFDoc %s (%d)\n",
                pdf_doc->file_path, pdf_doc->occurences);
#endif
        docName = new GooString(file_path);
        doc = new PDFDoc(docName);      // takes ownership of docName
        pdf_doc->pc++;

        if (!doc->isOk() || !doc->okToPrint()) {
            switch (fe) {
            case FE_FAIL:
                luatex_fail("PDF inclusion: reading PDF image failed");
                break;
            case FE_RETURN_NULL:
                delete doc;
                // delete docName;
                if (new_flag == 1) {
                    if (pdf_doc->file_path != NULL)
                        free(pdf_doc->file_path);
                    if (pdf_doc->checksum != NULL)
                        free(pdf_doc->checksum);
                    delete pdf_doc;
                }
                return (PdfDocument *) NULL;
                break;
            default:
                assert(0);
            }
        }
        pdf_doc->doc = doc;
    }
    // PDF file could be opened without problems, checksum ok.
    if (PdfDocumentTree == NULL)
        PdfDocumentTree = avl_create(CompPdfDocument, NULL, &avl_xallocator);
    if ((PdfDocument *) avl_find(PdfDocumentTree, pdf_doc) == NULL) {
        void **aa = avl_probe(PdfDocumentTree, pdf_doc);
        assert(aa != NULL);
    }
    pdf_doc->occurences++;
#ifdef DEBUG
    fprintf(stderr, "\nDEBUG: Incrementing %s (%d)\n",
            pdf_doc->file_path, pdf_doc->occurences);
#endif
    return pdf_doc;
}



// Returns pointer to PdfDocument structure for a PDF stream in memory
// of streamsize dimension 
// As before, creates a new PdfDocument structure if it doesn't exist yet
// with file_path = file_id

PdfDocument *refMemStreamPdfDocument(char *docstream, unsigned long long streamsize,const char *file_id)
{
    char *checksum;
    char *file_path;
    PdfDocument *pdf_doc;
    PDFDoc *doc = NULL;
    Object obj;
    MemStream *docmemstream = NULL;
    /*int new_flag = 0;*/
    size_t  cnt = 0;

    checksum = get_stream_checksum(docstream, streamsize);
    assert(checksum != NULL);
    cnt = strlen(file_id);
    assert(cnt>0 && cnt <STREAM_FILE_ID_LEN); 
    file_path = (char *) malloc(cnt+STREAM_URI_LEN+STRSTREAM_CHECKSUM_SIZE+1); // 1 for '\0'
    assert(file_path != NULL);
    strcpy(file_path,STREAM_URI);
    strcat(file_path,file_id);
    strcat(file_path,checksum);
    file_path[cnt+STREAM_URI_LEN+STRSTREAM_CHECKSUM_SIZE]='\0';
    if ((pdf_doc = findPdfDocument(file_path)) == NULL) {
#ifdef DEBUG
        fprintf(stderr, "\nDEBUG: New MemStreamPdfDocument %s\n", file_path);
#endif
        /*new_flag = 1;*/
        pdf_doc = new PdfDocument;
        pdf_doc->file_path = file_path;
        pdf_doc->checksum = checksum;
        pdf_doc->doc = NULL;
        pdf_doc->inObjList = NULL;
        pdf_doc->ObjMapTree = NULL;
        pdf_doc->occurences = 0;        // 0 = unreferenced
        pdf_doc->pc = 0;
    } else {
#ifdef DEBUG
        fprintf(stderr, "\nDEBUG: Found MemStreamPdfDocument %s (%d)\n",
                pdf_doc->file_path, pdf_doc->occurences);
#endif
        assert(pdf_doc->checksum != NULL);
        // As is now, checksum is in file_path, so this check should be useless.
        if (strncmp(pdf_doc->checksum, checksum, STRSTREAM_CHECKSUM_SIZE) != 0) {
            luatex_fail("PDF inclusion: stream has changed '%s'", file_path);
        }
	free(file_path);
        free(checksum);
    }
    assert(pdf_doc != NULL);
    if (pdf_doc->doc == NULL) {
#ifdef DEBUG
        fprintf(stderr, "\nDEBUG: New PDFDoc %s (%d)\n",
                pdf_doc->file_path, pdf_doc->occurences);
#endif
	docmemstream = new MemStream( docstream,0,streamsize, obj.initNull() ); 
        doc = new PDFDoc(docmemstream);      // takes ownership of docmemstream
        pdf_doc->pc++;

        if (!doc->isOk() || !doc->okToPrint()) {
	  luatex_fail("poppler: reading PDF Stream failed");
	}
        pdf_doc->doc = doc;
    }
    // PDF file could be opened without problems, checksum ok.
    if (PdfDocumentTree == NULL)
        PdfDocumentTree = avl_create(CompPdfDocument, NULL, &avl_xallocator);
    if ((PdfDocument *) avl_find(PdfDocumentTree, pdf_doc) == NULL) {
        void **aa = avl_probe(PdfDocumentTree, pdf_doc);
        assert(aa != NULL);
    }
    pdf_doc->occurences++;
#ifdef DEBUG
    fprintf(stderr, "\nDEBUG: Incrementing %s (%d)\n",
            pdf_doc->file_path, pdf_doc->occurences);
#endif
    return pdf_doc;
}



//**********************************************************************
// AVL sort ObjMap into ObjMapTree by object number and generation

// keep the ObjMap struct small, as these are accumulated until the end

struct ObjMap {
    Ref in;                     // object num/gen in orig. PDF file
    int out_num;                // object num after embedding (gen == 0)
};

static int CompObjMap(const void *pa, const void *pb, void * /*p */ )
{
    const Ref *a = &(((const ObjMap *) pa)->in);
    const Ref *b = &(((const ObjMap *) pb)->in);
    if (a->num > b->num)
        return 1;
    if (a->num < b->num)
        return -1;
    if (a->gen == b->gen)       // most likely gen == 0 anyway
        return 0;
    if (a->gen < b->gen)
        return -1;
    return 1;
}

static ObjMap *findObjMap(PdfDocument * pdf_doc, Ref in)
{
    ObjMap *obj_map, tmp;
    assert(pdf_doc != NULL);
    if (pdf_doc->ObjMapTree == NULL)
        return NULL;
    tmp.in = in;
    obj_map = (ObjMap *) avl_find(pdf_doc->ObjMapTree, &tmp);
    return obj_map;
}

static void addObjMap(PdfDocument * pdf_doc, Ref in, int out_num)
{
    ObjMap *obj_map = NULL;
    assert(findObjMap(pdf_doc, in) == NULL);
    if (pdf_doc->ObjMapTree == NULL)
        pdf_doc->ObjMapTree = avl_create(CompObjMap, NULL, &avl_xallocator);
    obj_map = new ObjMap;
    obj_map->in = in;
    obj_map->out_num = out_num;
    void **aa = avl_probe(pdf_doc->ObjMapTree, obj_map);
    assert(aa != NULL);
}

// When copying the Resources of the selected page, all objects are
// copied recursively top-down.  The findObjMap() function checks if an
// object has already been copied; if so, instead of copying just the
// new object number will be referenced.  The ObjMapTree guarantees,
// that during the entire LuaTeX run any object from any embedded PDF
// file will end up max. once in the output PDF file.  Indirect objects
// are not fetched during copying, but get a new object number from
// LuaTeX and then will be appended into a linked list.

static int addInObj(PDF pdf, PdfDocument * pdf_doc, Ref ref)
{
    ObjMap *obj_map;
    InObj *p, *q, *n;
    if (ref.num == 0) {
        luatex_fail("PDF inclusion: reference to invalid object"
                    " (is the included pdf broken?)");
    }
    if ((obj_map = findObjMap(pdf_doc, ref)) != NULL)
        return obj_map->out_num;
    n = new InObj;
    n->ref = ref;
    n->next = NULL;
    n->num = pdf_create_obj(pdf, obj_type_others, 0);
    addObjMap(pdf_doc, ref, n->num);
    if (pdf_doc->inObjList == NULL)
        pdf_doc->inObjList = n;
    else {
        // it is important to add new objects at the end of the list,
        // because new objects are being added while the list is being
        // written out by writeRefs().
        for (p = pdf_doc->inObjList; p != NULL; p = p->next)
            q = p;
        q->next = n;
    }
    return n->num;
}

//**********************************************************************
// Function converts double to pdffloat; very small and very large numbers
// are NOT converted to scientific notation.
// n must be a number or real conforming to the implementation limits
// of PDF as specified in appendix C.1 of the PDF Ref.
// These are:
// maximum value of ints is +2^32
// maximum value of reals is +2^15
// smalles values of reals is 1/(2^16)

static pdffloat conv_double_to_pdffloat(double n)
{
    pdffloat a;
    a.e = 6;
    a.m = i64round(n * ten_pow[a.e]);
    return a;
}

static void copyObject(PDF, PdfDocument *, Object *);

void copyReal(PDF pdf, double d)
{
    if (pdf->cave)
        pdf_out(pdf, ' ');
    print_pdffloat(pdf, conv_double_to_pdffloat(d));
    pdf->cave = true;
}

static void copyString(PDF pdf, GooString * string)
{
    char *p;
    unsigned char c;
    size_t i, l;
    p = string->getCString();
    l = (size_t) string->getLength();
    if (pdf->cave)
        pdf_out(pdf, ' ');
    if (strlen(p) == l) {
        pdf_out(pdf, '(');
        for (; *p != 0; p++) {
            c = (unsigned char) *p;
            if (c == '(' || c == ')' || c == '\\')
                pdf_printf(pdf, "\\%c", c);
            else if (c < 0x20 || c > 0x7F)
                pdf_printf(pdf, "\\%03o", (int) c);
            else
                pdf_out(pdf, c);
        }
        pdf_out(pdf, ')');
    } else {
        pdf_out(pdf, '<');
        for (i = 0; i < l; i++) {
            c = (unsigned char) string->getChar(i);
            pdf_printf(pdf, "%.2x", (int) c);
        }
        pdf_out(pdf, '>');
    }
    pdf->cave = true;
}

static void copyName(PDF pdf, char *s)
{
    pdf_out(pdf, '/');
    for (; *s != 0; s++) {
        if (isdigit(*s) || isupper(*s) || islower(*s) || *s == '_' ||
            *s == '.' || *s == '-' || *s == '+')
            pdf_out(pdf, *s);
        else
            pdf_printf(pdf, "#%.2X", *s & 0xFF);
    }
    pdf->cave = true;
}

static void copyArray(PDF pdf, PdfDocument * pdf_doc, Array * array)
{
    int i, l;
    Object obj1;
    pdf_begin_array(pdf);
    for (i = 0, l = array->getLength(); i < l; ++i) {
        array->getNF(i, &obj1);
        copyObject(pdf, pdf_doc, &obj1);
        obj1.free();
    }
    pdf_end_array(pdf);
}

static void copyDict(PDF pdf, PdfDocument * pdf_doc, Dict * dict)
{
    int i, l;
    Object obj1;
    pdf_begin_dict(pdf);
    for (i = 0, l = dict->getLength(); i < l; ++i) {
        copyName(pdf, dict->getKey(i));
        dict->getValNF(i, &obj1);
        copyObject(pdf, pdf_doc, &obj1);
        obj1.free();
    }
    pdf_end_dict(pdf);
}

static void copyStreamStream(PDF pdf, Stream * str)
{
    int c, i, len = 1024;
    str->reset();
    i = len;
    while ((c = str->getChar()) != EOF) {
        if (i == len) {
            pdf_room(pdf, len);
            i = 0;
        }
        pdf_quick_out(pdf, c);
        i++;
    }
}

static void copyStream(PDF pdf, PdfDocument * pdf_doc, Stream * stream)
{
    copyDict(pdf, pdf_doc, stream->getDict());
    pdf_begin_stream(pdf);
    assert(pdf->zip_write_state == NO_ZIP);
    copyStreamStream(pdf, stream->getUndecodedStream());
    pdf_end_stream(pdf);
}

static void copyObject(PDF pdf, PdfDocument * pdf_doc, Object * obj)
{
    switch (obj->getType()) {
    case objBool:
        pdf_add_bool(pdf, (int) obj->getBool());
        break;
    case objInt:
        pdf_add_int(pdf, obj->getInt());
        break;
    case objReal:
        copyReal(pdf, obj->getReal());
        break;
        // not needed:
        // case objNum:
        // GBool isNum() { return type == objInt || type == objReal; }
    case objString:
        copyString(pdf, obj->getString());
        break;
    case objName:
        copyName(pdf, obj->getName());
        break;
    case objNull:
        pdf_add_null(pdf);
        break;
    case objArray:
        copyArray(pdf, pdf_doc, obj->getArray());
        break;
    case objDict:
        copyDict(pdf, pdf_doc, obj->getDict());
        break;
    case objStream:
        copyStream(pdf, pdf_doc, obj->getStream());
        break;
    case objRef:
        pdf_add_ref(pdf, addInObj(pdf, pdf_doc, obj->getRef()));
        break;
    case objCmd:
    case objError:
    case objEOF:
    case objNone:
        luatex_fail("PDF inclusion: type <%s> cannot be copied",
                    obj->getTypeName());
        break;
    default:
        assert(0);              // poppler doesn't have any other types
    }
}

//**********************************************************************

static void writeRefs(PDF pdf, PdfDocument * pdf_doc)
{
    InObj *r, *n;
    Object obj1;
    XRef *xref;
    PDFDoc *doc = pdf_doc->doc;
    xref = doc->getXRef();
    for (r = pdf_doc->inObjList; r != NULL;) {
        xref->fetch(r->ref.num, r->ref.gen, &obj1);
        if (obj1.isStream())
            pdf_begin_obj(pdf, r->num, OBJSTM_NEVER);
        else
            pdf_begin_obj(pdf, r->num, 2);      // \pdfobjcompresslevel = 2 is for this
        copyObject(pdf, pdf_doc, &obj1);
        obj1.free();
        pdf_end_obj(pdf);
        n = r->next;
        delete r;
        pdf_doc->inObjList = r = n;
    }
}

// get the pagebox coordinates according to the pagebox_spec

static PDFRectangle *get_pagebox(Page * page, int pagebox_spec)
{
    switch (pagebox_spec) {
    case PDF_BOX_SPEC_MEDIA:
        return page->getMediaBox();
        break;
    case PDF_BOX_SPEC_CROP:
        return page->getCropBox();
        break;
    case PDF_BOX_SPEC_BLEED:
        return page->getBleedBox();
        break;
    case PDF_BOX_SPEC_TRIM:
        return page->getTrimBox();
        break;
    case PDF_BOX_SPEC_ART:
        return page->getArtBox();
        break;
    default:
        luatex_fail("PDF inclusion: unknown value of pagebox spec (%i)",
                    (int) pagebox_spec);
    }
    return page->getMediaBox(); // to make the compiler happy
}

// Reads various information about the PDF and sets it up for later inclusion.
// This will fail if the PDF version of the PDF is higher than
// minor_pdf_version_wanted or page_name is given and can not be found.
// It makes no sense to give page_name _and_ page_num.
// Returns the page number.

void
read_pdf_info(image_dict * idict, int minor_pdf_version_wanted,
              int pdf_inclusion_errorlevel, img_readtype_e readtype)
{
    PdfDocument *pdf_doc;
    PDFDoc *doc;
    Catalog *catalog;
    Page *page;
    int rotate;
    PDFRectangle *pagebox;
    int pdf_major_version_found, pdf_minor_version_found;
    float xsize, ysize, xorig, yorig;
    assert(idict != NULL);
    assert((img_type(idict) == IMG_TYPE_PDF) || (img_type(idict) == IMG_TYPE_PDFMEMSTREAM));
    assert(readtype == IMG_CLOSEINBETWEEN);     // only this is implemented
    // initialize
    if (isInit == gFalse) {
      if (!(globalParams)) // globalParams could be already created
	  globalParams = new GlobalParams();
	globalParams->setErrQuiet(gFalse);
	isInit = gTrue;
    }
    // open PDF file
    if (img_type(idict) == IMG_TYPE_PDF) 
      pdf_doc = refPdfDocument(img_filepath(idict), FE_FAIL);
    else if (img_type(idict) == IMG_TYPE_PDFMEMSTREAM) {
      pdf_doc = findPdfDocument(img_filepath(idict)) ;
      assert(pdf_doc != NULL);
      pdf_doc->occurences++; 
    } else
	luatex_fail("PDF inclusion: unknown document (1)");
    doc = pdf_doc->doc;
    catalog = doc->getCatalog();
    // check PDF version
    // this works only for PDF 1.x -- but since any versions of PDF newer
    // than 1.x will not be backwards compatible to PDF 1.x, pdfTeX will
    // then have to changed drastically anyway.
    pdf_major_version_found = doc->getPDFMajorVersion();
    pdf_minor_version_found = doc->getPDFMinorVersion();
    if ((pdf_major_version_found > 1)
        || (pdf_minor_version_found > minor_pdf_version_wanted)) {
        const char *msg =
            "PDF inclusion: found PDF version <%d.%d>, but at most version <1.%d> allowed";
        if (pdf_inclusion_errorlevel > 0) {
            luatex_fail(msg, pdf_major_version_found, pdf_minor_version_found,
                        minor_pdf_version_wanted);
        } else {
            luatex_warn(msg, pdf_major_version_found, pdf_minor_version_found,
                        minor_pdf_version_wanted);
        }
    }
    img_totalpages(idict) = catalog->getNumPages();
    if (img_pagename(idict)) {
        // get page by name
        GooString name(img_pagename(idict));
        LinkDest *link = doc->findDest(&name);
        if (link == NULL || !link->isOk())
            luatex_fail("PDF inclusion: invalid destination <%s>",
                        img_pagename(idict));
        Ref ref = link->getPageRef();
        img_pagenum(idict) = catalog->findPage(ref.num, ref.gen);
        if (img_pagenum(idict) == 0)
            luatex_fail("PDF inclusion: destination is not a page <%s>",
                        img_pagename(idict));
        delete link;
    } else {
        // get page by number
        if (img_pagenum(idict) <= 0
            || img_pagenum(idict) > img_totalpages(idict))
            luatex_fail("PDF inclusion: required page <%i> does not exist",
                        (int) img_pagenum(idict));
    }
    // get the required page
    page = catalog->getPage(img_pagenum(idict));

    // get the pagebox coordinates (media, crop,...) to use.
    pagebox = get_pagebox(page, img_pagebox(idict));
    if (pagebox->x2 > pagebox->x1) {
        xorig = pagebox->x1;
        xsize = pagebox->x2 - pagebox->x1;
    } else {
        xorig = pagebox->x2;
        xsize = pagebox->x1 - pagebox->x2;
    }
    if (pagebox->y2 > pagebox->y1) {
        yorig = pagebox->y1;
        ysize = pagebox->y2 - pagebox->y1;
    } else {
        yorig = pagebox->y2;
        ysize = pagebox->y1 - pagebox->y2;
    }
    // The following 4 parameters are raw. Do _not_ modify by /Rotate!
    img_xsize(idict) = bp2sp(xsize);
    img_ysize(idict) = bp2sp(ysize);
    img_xorig(idict) = bp2sp(xorig);
    img_yorig(idict) = bp2sp(yorig);

    // Handle /Rotate parameter. Only multiples of 90 deg. are allowed
    // (PDF Ref. v1.3, p. 78).
    rotate = page->getRotate();
    switch (((rotate % 360) + 360) % 360) {     // handles also neg. angles
    case 0:
        img_rotation(idict) = 0;
        break;
    case 90:
        img_rotation(idict) = 3;        // PDF counts clockwise!
        break;
    case 180:
        img_rotation(idict) = 2;
        break;
    case 270:
        img_rotation(idict) = 1;
        break;
    default:
        luatex_warn
            ("PDF inclusion: "
             "/Rotate parameter in PDF file not multiple of 90 degrees.");
    }

    // currently unused info whether PDF contains a /Group
    if (page->getGroup() != NULL)
        img_set_group(idict);

    if (readtype == IMG_CLOSEINBETWEEN)
        unrefPdfDocument(img_filepath(idict));
}

//**********************************************************************
// Writes the current epf_doc.
// Here the included PDF is copied, so most errors that can happen
// during PDF inclusion will arise here.

void write_epdf(PDF pdf, image_dict * idict)
{
    PdfDocument *pdf_doc;
    PDFDoc *doc;
    Catalog *catalog;
    Page *page;
    Ref *pageref;
    Dict *pageDict;
    Object obj1, contents, pageobj, pagesobj1, pagesobj2, *op1, *op2, *optmp;
    PDFRectangle *pagebox;
    int i, l;
    double bbox[4];
    char s[256];
    const char *pagedictkeys[] =
        { "Group", "LastModified", "Metadata", "PieceInfo", "Resources",
        "SeparationInfo", NULL
    };
    assert(idict != NULL);

    // open PDF file
    if (img_type(idict) == IMG_TYPE_PDF) 
      pdf_doc = refPdfDocument(img_filepath(idict), FE_FAIL);
    else if (img_type(idict) == IMG_TYPE_PDFMEMSTREAM) {
      pdf_doc = findPdfDocument(img_filepath(idict)) ;
      assert(pdf_doc != NULL);
      pdf_doc->occurences++; 
    } else
	luatex_fail("PDF inclusion: unknown document (2)");
    doc = pdf_doc->doc;
    catalog = doc->getCatalog();
    page = catalog->getPage(img_pagenum(idict));
    pageref = catalog->getPageRef(img_pagenum(idict));
    assert(pageref != NULL);    // was checked already in read_pdf_info()
    doc->getXRef()->fetch(pageref->num, pageref->gen, &pageobj);
    pageDict = pageobj.getDict();

    // write the Page header
    pdf_begin_obj(pdf, img_objnum(idict), OBJSTM_NEVER);
    pdf_begin_dict(pdf);
    pdf_dict_add_name(pdf, "Type", "XObject");
    pdf_dict_add_name(pdf, "Subtype", "Form");

    if (img_attr(idict) != NULL && strlen(img_attr(idict)) > 0)
        pdf_printf(pdf, "\n%s\n", img_attr(idict));
    pdf_dict_add_int(pdf, "FormType", 1);

    // write additional information
    pdf_dict_add_img_filename(pdf, idict);
    snprintf(s, 30, "%s.PageNumber", pdfkeyprefix);
    pdf_dict_add_int(pdf, s, (int) img_pagenum(idict));
    doc->getDocInfoNF(&obj1);
    if (obj1.isRef()) {
        // the info dict must be indirect (PDF Ref p. 61)
        snprintf(s, 30, "%s.InfoDict", pdfkeyprefix);
        pdf_dict_add_ref(pdf, s, addInObj(pdf, pdf_doc, obj1.getRef()));
    }
    obj1.free();
    if (img_is_bbox(idict)) {
        bbox[0] = sp2bp(img_bbox(idict)[0]);
        bbox[1] = sp2bp(img_bbox(idict)[1]);
        bbox[2] = sp2bp(img_bbox(idict)[2]);
        bbox[3] = sp2bp(img_bbox(idict)[3]);
    } else {
        // get the pagebox coordinates (media, crop,...) to use.
        pagebox = get_pagebox(page, img_pagebox(idict));
        bbox[0] = pagebox->x1;
        bbox[1] = pagebox->y1;
        bbox[2] = pagebox->x2;
        bbox[3] = pagebox->y2;
    }
    pdf_add_name(pdf, "BBox");
    pdf_begin_array(pdf);
    copyReal(pdf, bbox[0]);
    copyReal(pdf, bbox[1]);
    copyReal(pdf, bbox[2]);
    copyReal(pdf, bbox[3]);
    pdf_end_array(pdf);
    // The /Matrix calculation is replaced by transforms in out_img().

    // Now all relevant parts of the Page dictionary are copied:

    // Metadata validity check (as a stream it must be indirect)
    pageDict->lookupNF("Metadata", &obj1);
    if (!obj1.isNull() && !obj1.isRef())
        luatex_warn("PDF inclusion: /Metadata must be indirect object");
    obj1.free();

    // copy selected items in Page dictionary
    for (i = 0; pagedictkeys[i] != NULL; i++) {
        pageDict->lookupNF(pagedictkeys[i], &obj1);
        if (!obj1.isNull()) {
            pdf_add_name(pdf, pagedictkeys[i]);
            copyObject(pdf, pdf_doc, &obj1);    // preserves indirection
        }
        obj1.free();
    }

    // If there are no Resources in the Page dict of the embedded page,
    // try to inherit the Resources from the Pages tree of the embedded
    // PDF file, climbing up the tree until the Resources are found.
    // (This fixes a problem with Scribus 1.3.3.14.)
    pageDict->lookupNF("Resources", &obj1);
    if (obj1.isNull()) {
        op1 = &pagesobj1;
        op2 = &pagesobj2;
        pageDict->lookup("Parent", op1);
        while (op1->isDict()) {
            obj1.free();
            op1->dictLookupNF("Resources", &obj1);
            if (!obj1.isNull()) {
                pdf_add_name(pdf, "Resources");
                copyObject(pdf, pdf_doc, &obj1);
                break;
            }
            op1->dictLookup("Parent", op2);
            optmp = op1;
            op1 = op2;
            op2 = optmp;
            op2->free();
        };
        if (!op1->isDict())
            luatex_warn("PDF inclusion: Page /Resources missing.");
        op1->free();
    }
    obj1.free();

    // write the Page contents
    page->getContents(&contents);
    if (contents.isStream()) {
        // Variant A: get stream and recompress under control
        // of \pdfcompresslevel
        //
        // pdf_begin_stream();
        // copyStreamStream(contents->getStream());
        // pdf_end_stream();

        // Variant B: copy stream without recompressing
        //
        contents.streamGetDict()->lookup("F", &obj1);
        if (!obj1.isNull()) {
            luatex_fail("PDF inclusion: Unsupported external stream");
        }
        obj1.free();
        contents.streamGetDict()->lookup("Length", &obj1);
        assert(!obj1.isNull());
        pdf_add_name(pdf, "Length");
        copyObject(pdf, pdf_doc, &obj1);
        obj1.free();
        contents.streamGetDict()->lookup("Filter", &obj1);
        if (!obj1.isNull()) {
            pdf_add_name(pdf, "Filter");
            copyObject(pdf, pdf_doc, &obj1);
            obj1.free();
            contents.streamGetDict()->lookup("DecodeParms", &obj1);
            if (!obj1.isNull()) {
                pdf_add_name(pdf, "DecodeParms");
                copyObject(pdf, pdf_doc, &obj1);
            }
        }
        obj1.free();
        pdf_end_dict(pdf);
        pdf_begin_stream(pdf);
        copyStreamStream(pdf, contents.getStream()->getUndecodedStream());
        pdf_end_stream(pdf);
        pdf_end_obj(pdf);
    } else if (contents.isArray()) {
        pdf_dict_add_streaminfo(pdf);
        pdf_end_dict(pdf);
        pdf_begin_stream(pdf);
        for (i = 0, l = contents.arrayGetLength(); i < l; ++i) {
            copyStreamStream(pdf, (contents.arrayGet(i, &obj1))->getStream());
            obj1.free();
            if (i < (l - 1)) {
                // put a space between streams to be on the safe side (streams
                // should have a trailing space here, but one never knows)
                pdf_out(pdf, ' ');
            }
        }
        pdf_end_stream(pdf);
        pdf_end_obj(pdf);
    } else {                    // the contents are optional, but we need to include an empty stream
        pdf_dict_add_streaminfo(pdf);
        pdf_end_dict(pdf);
        pdf_begin_stream(pdf);
        pdf_end_stream(pdf);
        pdf_end_obj(pdf);
    }
    // write out all indirect objects
    writeRefs(pdf, pdf_doc);
    contents.free();
    pageobj.free();
    // unrefPdfDocument() must come after contents.free() and pageobj.free()!
    // TH: The next line makes repeated pdf inclusion unacceptably slow
#if 0
    unrefPdfDocument(img_filepath(idict));
#endif
}

//**********************************************************************
// Deallocate a PdfDocument with all its resources

static void deletePdfDocumentPdfDoc(PdfDocument * pdf_doc)
{
    InObj *r, *n;
    assert(pdf_doc != NULL);
    // this may be probably needed for an emergency destroyPdfDocument()
    for (r = pdf_doc->inObjList; r != NULL; r = n) {
        n = r->next;
        delete r;
    }
#ifdef DEBUG
    fprintf(stderr, "\nDEBUG: Deleting PDFDoc %s\n", pdf_doc->file_path);
#endif
    delete pdf_doc->doc;
    pdf_doc->doc = NULL;
    pdf_doc->pc++;
}

static void destroyPdfDocument(void *pa, void * /*pb */ )
{
    PdfDocument *pdf_doc = (PdfDocument *) pa;
    deletePdfDocumentPdfDoc(pdf_doc);
    // TODO: delete rest of pdf_doc
}

// Called when an image has been written and its resources in image_tab are
// freed and it's not referenced anymore.

void unrefPdfDocument(char *file_path)
{
    PdfDocument *pdf_doc = findPdfDocument(file_path);
    if (pdf_doc == NULL) /* Does the caller break the contract ? */
return;
    if (pdf_doc->occurences == 0) /* Again, does the caller breaks the contract ? */
return; 
    /* for the moment we keep these assert here as remind that the code */
    /* should be revisited                                              */
    //assert(pdf_doc != NULL);
    //assert(pdf_doc->occurences != 0);   // aim for point landing
    pdf_doc->occurences--;
#ifdef DEBUG
    fprintf(stderr, "\nDEBUG: Decrementing %s (%d)\n",
            pdf_doc->file_path, pdf_doc->occurences);
#endif
    if (pdf_doc->occurences == 0) {
        assert(pdf_doc->inObjList == NULL);     // should be eaten up already
        deletePdfDocumentPdfDoc(pdf_doc);
    }
}



// For completeness, but it isn't  currently used
// (unreferencing is done by mean of file_path) 

void unrefMemStreamPdfDocument(char *file_id)
{
  (void) unrefPdfDocument(file_id);
    
}

// Called when PDF embedding system is finalized.
// Now deallocate all remaining PdfDocuments.

void epdf_free()
{
    if (PdfDocumentTree != NULL)
        avl_destroy(PdfDocumentTree, destroyPdfDocument);
    PdfDocumentTree = NULL;
    if (isInit == gTrue)
        delete globalParams;
    isInit = gFalse;
}