summaryrefslogtreecommitdiff
path: root/core/fpdfapi/font/cpdf_cidfont.cpp
blob: 41627c069f7d2aec7c25b1c32d70e82a20a4f768 (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
// Copyright 2016 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com

#include "core/fpdfapi/font/cpdf_cidfont.h"

#include <algorithm>
#include <limits>
#include <vector>

#include "core/fpdfapi/cmaps/cmap_int.h"
#include "core/fpdfapi/cpdf_modulemgr.h"
#include "core/fpdfapi/font/cfx_cttgsubtable.h"
#include "core/fpdfapi/font/cpdf_cid2unicodemap.h"
#include "core/fpdfapi/font/cpdf_cmap.h"
#include "core/fpdfapi/font/cpdf_cmapparser.h"
#include "core/fpdfapi/font/cpdf_fontencoding.h"
#include "core/fpdfapi/page/cpdf_pagemodule.h"
#include "core/fpdfapi/parser/cpdf_array.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_stream_acc.h"
#include "third_party/base/numerics/safe_math.h"
#include "third_party/base/ptr_util.h"
#include "third_party/base/span.h"
#include "third_party/base/stl_util.h"

namespace {

const uint16_t g_CharsetCPs[CIDSET_NUM_SETS] = {0, 936, 950, 932, 949, 1200};

const struct CIDTransform {
  uint16_t cid;
  uint8_t a;
  uint8_t b;
  uint8_t c;
  uint8_t d;
  uint8_t e;
  uint8_t f;
} g_Japan1_VertCIDs[] = {
    {97, 129, 0, 0, 127, 55, 0},     {7887, 127, 0, 0, 127, 76, 89},
    {7888, 127, 0, 0, 127, 79, 94},  {7889, 0, 129, 127, 0, 17, 127},
    {7890, 0, 129, 127, 0, 17, 127}, {7891, 0, 129, 127, 0, 17, 127},
    {7892, 0, 129, 127, 0, 17, 127}, {7893, 0, 129, 127, 0, 17, 127},
    {7894, 0, 129, 127, 0, 17, 127}, {7895, 0, 129, 127, 0, 17, 127},
    {7896, 0, 129, 127, 0, 17, 127}, {7897, 0, 129, 127, 0, 17, 127},
    {7898, 0, 129, 127, 0, 17, 127}, {7899, 0, 129, 127, 0, 17, 104},
    {7900, 0, 129, 127, 0, 17, 127}, {7901, 0, 129, 127, 0, 17, 104},
    {7902, 0, 129, 127, 0, 17, 127}, {7903, 0, 129, 127, 0, 17, 127},
    {7904, 0, 129, 127, 0, 17, 127}, {7905, 0, 129, 127, 0, 17, 114},
    {7906, 0, 129, 127, 0, 17, 127}, {7907, 0, 129, 127, 0, 17, 127},
    {7908, 0, 129, 127, 0, 17, 127}, {7909, 0, 129, 127, 0, 17, 127},
    {7910, 0, 129, 127, 0, 17, 127}, {7911, 0, 129, 127, 0, 17, 127},
    {7912, 0, 129, 127, 0, 17, 127}, {7913, 0, 129, 127, 0, 17, 127},
    {7914, 0, 129, 127, 0, 17, 127}, {7915, 0, 129, 127, 0, 17, 114},
    {7916, 0, 129, 127, 0, 17, 127}, {7917, 0, 129, 127, 0, 17, 127},
    {7918, 127, 0, 0, 127, 18, 25},  {7919, 127, 0, 0, 127, 18, 25},
    {7920, 127, 0, 0, 127, 18, 25},  {7921, 127, 0, 0, 127, 18, 25},
    {7922, 127, 0, 0, 127, 18, 25},  {7923, 127, 0, 0, 127, 18, 25},
    {7924, 127, 0, 0, 127, 18, 25},  {7925, 127, 0, 0, 127, 18, 25},
    {7926, 127, 0, 0, 127, 18, 25},  {7927, 127, 0, 0, 127, 18, 25},
    {7928, 127, 0, 0, 127, 18, 25},  {7929, 127, 0, 0, 127, 18, 25},
    {7930, 127, 0, 0, 127, 18, 25},  {7931, 127, 0, 0, 127, 18, 25},
    {7932, 127, 0, 0, 127, 18, 25},  {7933, 127, 0, 0, 127, 18, 25},
    {7934, 127, 0, 0, 127, 18, 25},  {7935, 127, 0, 0, 127, 18, 25},
    {7936, 127, 0, 0, 127, 18, 25},  {7937, 127, 0, 0, 127, 18, 25},
    {7938, 127, 0, 0, 127, 18, 25},  {7939, 127, 0, 0, 127, 18, 25},
    {8720, 0, 129, 127, 0, 19, 102}, {8721, 0, 129, 127, 0, 13, 127},
    {8722, 0, 129, 127, 0, 19, 108}, {8723, 0, 129, 127, 0, 19, 102},
    {8724, 0, 129, 127, 0, 19, 102}, {8725, 0, 129, 127, 0, 19, 102},
    {8726, 0, 129, 127, 0, 19, 102}, {8727, 0, 129, 127, 0, 19, 102},
    {8728, 0, 129, 127, 0, 19, 114}, {8729, 0, 129, 127, 0, 19, 114},
    {8730, 0, 129, 127, 0, 38, 108}, {8731, 0, 129, 127, 0, 13, 108},
    {8732, 0, 129, 127, 0, 19, 108}, {8733, 0, 129, 127, 0, 19, 108},
    {8734, 0, 129, 127, 0, 19, 108}, {8735, 0, 129, 127, 0, 19, 108},
    {8736, 0, 129, 127, 0, 19, 102}, {8737, 0, 129, 127, 0, 19, 102},
    {8738, 0, 129, 127, 0, 19, 102}, {8739, 0, 129, 127, 0, 19, 102},
    {8740, 0, 129, 127, 0, 19, 102}, {8741, 0, 129, 127, 0, 19, 102},
    {8742, 0, 129, 127, 0, 19, 102}, {8743, 0, 129, 127, 0, 19, 102},
    {8744, 0, 129, 127, 0, 19, 102}, {8745, 0, 129, 127, 0, 19, 102},
    {8746, 0, 129, 127, 0, 19, 114}, {8747, 0, 129, 127, 0, 19, 114},
    {8748, 0, 129, 127, 0, 19, 102}, {8749, 0, 129, 127, 0, 19, 102},
    {8750, 0, 129, 127, 0, 19, 102}, {8751, 0, 129, 127, 0, 19, 102},
    {8752, 0, 129, 127, 0, 19, 102}, {8753, 0, 129, 127, 0, 19, 102},
    {8754, 0, 129, 127, 0, 19, 102}, {8755, 0, 129, 127, 0, 19, 102},
    {8756, 0, 129, 127, 0, 19, 102}, {8757, 0, 129, 127, 0, 19, 102},
    {8758, 0, 129, 127, 0, 19, 102}, {8759, 0, 129, 127, 0, 19, 102},
    {8760, 0, 129, 127, 0, 19, 102}, {8761, 0, 129, 127, 0, 19, 102},
    {8762, 0, 129, 127, 0, 19, 102}, {8763, 0, 129, 127, 0, 19, 102},
    {8764, 0, 129, 127, 0, 19, 102}, {8765, 0, 129, 127, 0, 19, 102},
    {8766, 0, 129, 127, 0, 19, 102}, {8767, 0, 129, 127, 0, 19, 102},
    {8768, 0, 129, 127, 0, 19, 102}, {8769, 0, 129, 127, 0, 19, 102},
    {8770, 0, 129, 127, 0, 19, 102}, {8771, 0, 129, 127, 0, 19, 102},
    {8772, 0, 129, 127, 0, 19, 102}, {8773, 0, 129, 127, 0, 19, 102},
    {8774, 0, 129, 127, 0, 19, 102}, {8775, 0, 129, 127, 0, 19, 102},
    {8776, 0, 129, 127, 0, 19, 102}, {8777, 0, 129, 127, 0, 19, 102},
    {8778, 0, 129, 127, 0, 19, 102}, {8779, 0, 129, 127, 0, 19, 114},
    {8780, 0, 129, 127, 0, 19, 108}, {8781, 0, 129, 127, 0, 19, 114},
    {8782, 0, 129, 127, 0, 13, 114}, {8783, 0, 129, 127, 0, 19, 108},
    {8784, 0, 129, 127, 0, 13, 114}, {8785, 0, 129, 127, 0, 19, 108},
    {8786, 0, 129, 127, 0, 19, 108}, {8787, 0, 129, 127, 0, 19, 108},
    {8788, 0, 129, 127, 0, 19, 108}, {8789, 0, 129, 127, 0, 19, 108},
    {8790, 0, 129, 127, 0, 19, 108}, {8791, 0, 129, 127, 0, 19, 108},
    {8792, 0, 129, 127, 0, 19, 108}, {8793, 0, 129, 127, 0, 19, 108},
    {8794, 0, 129, 127, 0, 19, 108}, {8795, 0, 129, 127, 0, 19, 108},
    {8796, 0, 129, 127, 0, 19, 108}, {8797, 0, 129, 127, 0, 19, 108},
    {8798, 0, 129, 127, 0, 19, 108}, {8799, 0, 129, 127, 0, 19, 108},
    {8800, 0, 129, 127, 0, 19, 108}, {8801, 0, 129, 127, 0, 19, 108},
    {8802, 0, 129, 127, 0, 19, 108}, {8803, 0, 129, 127, 0, 19, 108},
    {8804, 0, 129, 127, 0, 19, 108}, {8805, 0, 129, 127, 0, 19, 108},
    {8806, 0, 129, 127, 0, 19, 108}, {8807, 0, 129, 127, 0, 19, 108},
    {8808, 0, 129, 127, 0, 19, 108}, {8809, 0, 129, 127, 0, 19, 108},
    {8810, 0, 129, 127, 0, 19, 108}, {8811, 0, 129, 127, 0, 19, 114},
    {8812, 0, 129, 127, 0, 19, 102}, {8813, 0, 129, 127, 0, 19, 114},
    {8814, 0, 129, 127, 0, 76, 102}, {8815, 0, 129, 127, 0, 13, 121},
    {8816, 0, 129, 127, 0, 19, 114}, {8817, 0, 129, 127, 0, 19, 127},
    {8818, 0, 129, 127, 0, 19, 114}, {8819, 0, 129, 127, 0, 218, 108},
};

// Boundary values to avoid integer overflow when multiplied by 1000.
constexpr long kMinCBox = -2147483;
constexpr long kMaxCBox = 2147483;

// Boundary value to avoid integer overflow when adding 1/64th of the value.
constexpr int kMaxRectTop = 2114445437;

CPDF_FontGlobals* GetFontGlobals() {
  return CPDF_ModuleMgr::Get()->GetPageModule()->GetFontGlobals();
}

#if _FX_PLATFORM_ != _FX_PLATFORM_WINDOWS_

bool IsValidEmbeddedCharcodeFromUnicodeCharset(CIDSet charset) {
  switch (charset) {
    case CIDSET_GB1:
    case CIDSET_CNS1:
    case CIDSET_JAPAN1:
    case CIDSET_KOREA1:
      return true;

    default:
      return false;
  }
}

wchar_t EmbeddedUnicodeFromCharcode(const FXCMAP_CMap* pEmbedMap,
                                    CIDSet charset,
                                    uint32_t charcode) {
  if (!IsValidEmbeddedCharcodeFromUnicodeCharset(charset))
    return 0;

  uint16_t cid = CIDFromCharCode(pEmbedMap, charcode);
  if (!cid)
    return 0;

  pdfium::span<const uint16_t> map =
      GetFontGlobals()->GetEmbeddedToUnicode(charset);
  return cid < map.size() ? map[cid] : 0;
}

uint32_t EmbeddedCharcodeFromUnicode(const FXCMAP_CMap* pEmbedMap,
                                     CIDSet charset,
                                     wchar_t unicode) {
  if (!IsValidEmbeddedCharcodeFromUnicodeCharset(charset))
    return 0;

  pdfium::span<const uint16_t> map =
      GetFontGlobals()->GetEmbeddedToUnicode(charset);
  for (uint32_t i = 0; i < map.size(); ++i) {
    if (map[i] == unicode) {
      uint32_t charCode = CharCodeFromCID(pEmbedMap, i);
      if (charCode)
        return charCode;
    }
  }
  return 0;
}

#endif  // _FX_PLATFORM_ != _FX_PLATFORM_WINDOWS_

void FT_UseCIDCharmap(FXFT_Face face, int coding) {
  int encoding;
  switch (coding) {
    case CIDCODING_GB:
      encoding = FXFT_ENCODING_GB2312;
      break;
    case CIDCODING_BIG5:
      encoding = FXFT_ENCODING_BIG5;
      break;
    case CIDCODING_JIS:
      encoding = FXFT_ENCODING_SJIS;
      break;
    case CIDCODING_KOREA:
      encoding = FXFT_ENCODING_JOHAB;
      break;
    default:
      encoding = FXFT_ENCODING_UNICODE;
  }
  int err = FXFT_Select_Charmap(face, encoding);
  if (err)
    err = FXFT_Select_Charmap(face, FXFT_ENCODING_UNICODE);
  if (err && FXFT_Get_Face_Charmaps(face))
    FXFT_Set_Charmap(face, *FXFT_Get_Face_Charmaps(face));
}

bool IsMetricForCID(const uint32_t* pEntry, uint16_t CID) {
  return pEntry[0] <= CID && pEntry[1] >= CID;
}

}  // namespace

CPDF_CIDFont::CPDF_CIDFont(CPDF_Document* pDocument, CPDF_Dictionary* pFontDict)
    : CPDF_Font(pDocument, pFontDict) {
  for (size_t i = 0; i < FX_ArraySize(m_CharBBox); ++i)
    m_CharBBox[i] = FX_RECT(-1, -1, -1, -1);
}

CPDF_CIDFont::~CPDF_CIDFont() {}

bool CPDF_CIDFont::IsCIDFont() const {
  return true;
}

const CPDF_CIDFont* CPDF_CIDFont::AsCIDFont() const {
  return this;
}

CPDF_CIDFont* CPDF_CIDFont::AsCIDFont() {
  return this;
}

uint16_t CPDF_CIDFont::CIDFromCharCode(uint32_t charcode) const {
  return m_pCMap ? m_pCMap->CIDFromCharCode(charcode)
                 : static_cast<uint16_t>(charcode);
}

bool CPDF_CIDFont::IsVertWriting() const {
  return m_pCMap && m_pCMap->IsVertWriting();
}

WideString CPDF_CIDFont::UnicodeFromCharCode(uint32_t charcode) const {
  WideString str = CPDF_Font::UnicodeFromCharCode(charcode);
  if (!str.IsEmpty())
    return str;
  wchar_t ret = GetUnicodeFromCharCode(charcode);
  return ret ? ret : WideString();
}

wchar_t CPDF_CIDFont::GetUnicodeFromCharCode(uint32_t charcode) const {
  switch (m_pCMap->GetCoding()) {
    case CIDCODING_UCS2:
    case CIDCODING_UTF16:
      return static_cast<wchar_t>(charcode);
    case CIDCODING_CID:
      if (!m_pCID2UnicodeMap || !m_pCID2UnicodeMap->IsLoaded())
        return 0;
      return m_pCID2UnicodeMap->UnicodeFromCID(static_cast<uint16_t>(charcode));
  }
  if (m_pCID2UnicodeMap && m_pCID2UnicodeMap->IsLoaded() && m_pCMap->IsLoaded())
    return m_pCID2UnicodeMap->UnicodeFromCID(CIDFromCharCode(charcode));

#if _FX_PLATFORM_ == _FX_PLATFORM_WINDOWS_
  wchar_t unicode;
  int charsize = 1;
  if (charcode > 255) {
    charcode = (charcode % 256) * 256 + (charcode / 256);
    charsize = 2;
  }
  int ret = FXSYS_MultiByteToWideChar(g_CharsetCPs[m_pCMap->GetCoding()], 0,
                                      reinterpret_cast<const char*>(&charcode),
                                      charsize, &unicode, 1);
  return ret == 1 ? unicode : 0;
#else
  if (!m_pCMap->GetEmbedMap())
    return 0;
  return EmbeddedUnicodeFromCharcode(m_pCMap->GetEmbedMap(),
                                     m_pCMap->GetCharset(), charcode);
#endif
}

uint32_t CPDF_CIDFont::CharCodeFromUnicode(wchar_t unicode) const {
  uint32_t charcode = CPDF_Font::CharCodeFromUnicode(unicode);
  if (charcode)
    return charcode;
  switch (m_pCMap->GetCoding()) {
    case CIDCODING_UNKNOWN:
      return 0;
    case CIDCODING_UCS2:
    case CIDCODING_UTF16:
      return unicode;
    case CIDCODING_CID: {
      if (!m_pCID2UnicodeMap || !m_pCID2UnicodeMap->IsLoaded())
        return 0;
      uint32_t CID = 0;
      while (CID < 65536) {
        wchar_t this_unicode =
            m_pCID2UnicodeMap->UnicodeFromCID(static_cast<uint16_t>(CID));
        if (this_unicode == unicode)
          return CID;
        CID++;
      }
      break;
    }
  }

  if (unicode < 0x80)
    return static_cast<uint32_t>(unicode);
  if (m_pCMap->GetCoding() == CIDCODING_CID)
    return 0;
#if _FX_PLATFORM_ == _FX_PLATFORM_WINDOWS_
  uint8_t buffer[32];
  int ret = FXSYS_WideCharToMultiByte(
      g_CharsetCPs[m_pCMap->GetCoding()], 0, &unicode, 1,
      reinterpret_cast<char*>(buffer), 4, nullptr, nullptr);
  if (ret == 1)
    return buffer[0];
  if (ret == 2)
    return buffer[0] * 256 + buffer[1];
#else
  if (m_pCMap->GetEmbedMap()) {
    return EmbeddedCharcodeFromUnicode(m_pCMap->GetEmbedMap(),
                                       m_pCMap->GetCharset(), unicode);
  }
#endif
  return 0;
}

bool CPDF_CIDFont::Load() {
  if (m_pFontDict->GetStringFor("Subtype") == "TrueType") {
    LoadGB2312();
    return true;
  }

  const CPDF_Array* pFonts = m_pFontDict->GetArrayFor("DescendantFonts");
  if (!pFonts || pFonts->size() != 1)
    return false;

  const CPDF_Dictionary* pCIDFontDict = pFonts->GetDictAt(0);
  if (!pCIDFontDict)
    return false;

  m_BaseFont = pCIDFontDict->GetStringFor("BaseFont");
  if ((m_BaseFont.Compare("CourierStd") == 0 ||
       m_BaseFont.Compare("CourierStd-Bold") == 0 ||
       m_BaseFont.Compare("CourierStd-BoldOblique") == 0 ||
       m_BaseFont.Compare("CourierStd-Oblique") == 0) &&
      !IsEmbedded()) {
    m_bAdobeCourierStd = true;
  }
  const CPDF_Dictionary* pFontDesc = pCIDFontDict->GetDictFor("FontDescriptor");
  if (pFontDesc)
    LoadFontDescriptor(pFontDesc);

  CPDF_Object* pEncoding = m_pFontDict->GetDirectObjectFor("Encoding");
  if (!pEncoding)
    return false;

  ByteString subtype = pCIDFontDict->GetStringFor("Subtype");
  m_bType1 = (subtype == "CIDFontType0");

  CPDF_CMapManager* manager = GetFontGlobals()->GetCMapManager();
  if (pEncoding->IsName()) {
    ByteString cmap = pEncoding->GetString();
    m_pCMap = manager->GetPredefinedCMap(cmap);
    if (!m_pCMap)
      return false;
  } else if (CPDF_Stream* pStream = pEncoding->AsStream()) {
    auto pAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pStream);
    pAcc->LoadAllDataFiltered();
    m_pCMap = pdfium::MakeRetain<CPDF_CMap>();
    m_pCMap->LoadEmbedded(pAcc->GetSpan());
  } else {
    return false;
  }

  m_Charset = m_pCMap->GetCharset();
  if (m_Charset == CIDSET_UNKNOWN) {
    const CPDF_Dictionary* pCIDInfo = pCIDFontDict->GetDictFor("CIDSystemInfo");
    if (pCIDInfo) {
      m_Charset = CPDF_CMapParser::CharsetFromOrdering(
          pCIDInfo->GetStringFor("Ordering").AsStringView());
    }
  }
  if (m_Charset != CIDSET_UNKNOWN) {
    m_pCID2UnicodeMap = manager->GetCID2UnicodeMap(m_Charset);
  }
  if (m_Font.GetFace()) {
    if (m_bType1)
      FXFT_Select_Charmap(m_Font.GetFace(), FXFT_ENCODING_UNICODE);
    else
      FT_UseCIDCharmap(m_Font.GetFace(), m_pCMap->GetCoding());
  }
  m_DefaultWidth = pCIDFontDict->GetIntegerFor("DW", 1000);
  const CPDF_Array* pWidthArray = pCIDFontDict->GetArrayFor("W");
  if (pWidthArray)
    LoadMetricsArray(pWidthArray, &m_WidthList, 1);
  if (!IsEmbedded())
    LoadSubstFont();

  const CPDF_Object* pmap = pCIDFontDict->GetDirectObjectFor("CIDToGIDMap");
  if (pmap) {
    if (const CPDF_Stream* pStream = pmap->AsStream()) {
      m_pStreamAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pStream);
      m_pStreamAcc->LoadAllDataFiltered();
    } else if (m_pFontFile && pmap->GetString() == "Identity") {
      m_bCIDIsGID = true;
    }
  }

  CheckFontMetrics();
  if (IsVertWriting()) {
    pWidthArray = pCIDFontDict->GetArrayFor("W2");
    if (pWidthArray)
      LoadMetricsArray(pWidthArray, &m_VertMetrics, 3);
    const CPDF_Array* pDefaultArray = pCIDFontDict->GetArrayFor("DW2");
    if (pDefaultArray) {
      m_DefaultVY = pDefaultArray->GetIntegerAt(0);
      m_DefaultW1 = pDefaultArray->GetIntegerAt(1);
    }
  }
  return true;
}

FX_RECT CPDF_CIDFont::GetCharBBox(uint32_t charcode) {
  if (charcode < 256 && m_CharBBox[charcode].right != -1)
    return m_CharBBox[charcode];

  FX_RECT rect;
  bool bVert = false;
  int glyph_index = GlyphFromCharCode(charcode, &bVert);
  FXFT_Face face = m_Font.GetFace();
  if (face) {
    if (FXFT_Is_Face_Tricky(face)) {
      int err = FXFT_Load_Glyph(face, glyph_index,
                                FXFT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH);
      if (!err) {
        FXFT_Glyph glyph;
        err = FXFT_Get_Glyph(((FXFT_Face)face)->glyph, &glyph);
        if (!err) {
          FXFT_BBox cbox;
          FXFT_Glyph_Get_CBox(glyph, FXFT_GLYPH_BBOX_PIXELS, &cbox);
          cbox.xMin = pdfium::clamp(cbox.xMin, kMinCBox, kMaxCBox);
          cbox.xMax = pdfium::clamp(cbox.xMax, kMinCBox, kMaxCBox);
          cbox.yMin = pdfium::clamp(cbox.yMin, kMinCBox, kMaxCBox);
          cbox.yMax = pdfium::clamp(cbox.yMax, kMinCBox, kMaxCBox);
          int pixel_size_x = ((FXFT_Face)face)->size->metrics.x_ppem;
          int pixel_size_y = ((FXFT_Face)face)->size->metrics.y_ppem;
          if (pixel_size_x == 0 || pixel_size_y == 0) {
            rect = FX_RECT(cbox.xMin, cbox.yMax, cbox.xMax, cbox.yMin);
          } else {
            rect = FX_RECT(cbox.xMin * 1000 / pixel_size_x,
                           cbox.yMax * 1000 / pixel_size_y,
                           cbox.xMax * 1000 / pixel_size_x,
                           cbox.yMin * 1000 / pixel_size_y);
          }
          rect.top = std::min(rect.top,
                              static_cast<int>(FXFT_Get_Face_Ascender(face)));
          rect.bottom = std::max(
              rect.bottom, static_cast<int>(FXFT_Get_Face_Descender(face)));
          FXFT_Done_Glyph(glyph);
        }
      }
    } else {
      int err = FXFT_Load_Glyph(face, glyph_index, FXFT_LOAD_NO_SCALE);
      if (err == 0) {
        rect = FX_RECT(TT2PDF(FXFT_Get_Glyph_HoriBearingX(face), face),
                       TT2PDF(FXFT_Get_Glyph_HoriBearingY(face), face),
                       TT2PDF(FXFT_Get_Glyph_HoriBearingX(face) +
                                  FXFT_Get_Glyph_Width(face),
                              face),
                       TT2PDF(FXFT_Get_Glyph_HoriBearingY(face) -
                                  FXFT_Get_Glyph_Height(face),
                              face));
        if (rect.top <= kMaxRectTop)
          rect.top += rect.top / 64;
        else
          rect.top = std::numeric_limits<int>::max();
      }
    }
  }
  if (!m_pFontFile && m_Charset == CIDSET_JAPAN1) {
    uint16_t CID = CIDFromCharCode(charcode);
    const uint8_t* pTransform = GetCIDTransform(CID);
    if (pTransform && !bVert) {
      CFX_Matrix matrix(CIDTransformToFloat(pTransform[0]),
                        CIDTransformToFloat(pTransform[1]),
                        CIDTransformToFloat(pTransform[2]),
                        CIDTransformToFloat(pTransform[3]),
                        CIDTransformToFloat(pTransform[4]) * 1000,
                        CIDTransformToFloat(pTransform[5]) * 1000);
      rect = matrix.TransformRect(CFX_FloatRect(rect)).GetOuterRect();
    }
  }
  if (charcode < 256)
    m_CharBBox[charcode] = rect;

  return rect;
}

uint32_t CPDF_CIDFont::GetCharWidthF(uint32_t charcode) {
  if (charcode < 0x80 && m_bAnsiWidthsFixed)
    return (charcode >= 32 && charcode < 127) ? 500 : 0;

  uint16_t cid = CIDFromCharCode(charcode);
  size_t size = m_WidthList.size();
  const uint32_t* pList = m_WidthList.data();
  for (size_t i = 0; i < size; i += 3) {
    const uint32_t* pEntry = pList + i;
    if (IsMetricForCID(pEntry, cid))
      return pEntry[2];
  }
  return m_DefaultWidth;
}

short CPDF_CIDFont::GetVertWidth(uint16_t CID) const {
  size_t vertsize = m_VertMetrics.size() / 5;
  if (vertsize) {
    const uint32_t* pTable = m_VertMetrics.data();
    for (size_t i = 0; i < vertsize; i++) {
      const uint32_t* pEntry = pTable + (i * 5);
      if (IsMetricForCID(pEntry, CID))
        return static_cast<short>(pEntry[2]);
    }
  }
  return m_DefaultW1;
}

void CPDF_CIDFont::GetVertOrigin(uint16_t CID, short& vx, short& vy) const {
  size_t vertsize = m_VertMetrics.size() / 5;
  if (vertsize) {
    const uint32_t* pTable = m_VertMetrics.data();
    for (size_t i = 0; i < vertsize; i++) {
      const uint32_t* pEntry = pTable + (i * 5);
      if (IsMetricForCID(pEntry, CID)) {
        vx = static_cast<short>(pEntry[3]);
        vy = static_cast<short>(pEntry[4]);
        return;
      }
    }
  }
  uint32_t dwWidth = m_DefaultWidth;
  size_t size = m_WidthList.size();
  const uint32_t* pList = m_WidthList.data();
  for (size_t i = 0; i < size; i += 3) {
    const uint32_t* pEntry = pList + i;
    if (IsMetricForCID(pEntry, CID)) {
      dwWidth = pEntry[2];
      break;
    }
  }
  vx = static_cast<short>(dwWidth) / 2;
  vy = m_DefaultVY;
}

int CPDF_CIDFont::GetGlyphIndex(uint32_t unicode, bool* pVertGlyph) {
  if (pVertGlyph)
    *pVertGlyph = false;

  FXFT_Face face = m_Font.GetFace();
  int index = FXFT_Get_Char_Index(face, unicode);
  if (unicode == 0x2502)
    return index;

  if (!index || !IsVertWriting())
    return index;

  if (m_pTTGSUBTable)
    return GetVerticalGlyph(index, pVertGlyph);

  if (!m_Font.GetSubData()) {
    unsigned long length = 0;
    int error = FXFT_Load_Sfnt_Table(face, FT_MAKE_TAG('G', 'S', 'U', 'B'), 0,
                                     nullptr, &length);
    if (!error)
      m_Font.SetSubData(FX_Alloc(uint8_t, length));
  }
  int error = FXFT_Load_Sfnt_Table(face, FT_MAKE_TAG('G', 'S', 'U', 'B'), 0,
                                   m_Font.GetSubData(), nullptr);
  if (error || !m_Font.GetSubData())
    return index;

  m_pTTGSUBTable = pdfium::MakeUnique<CFX_CTTGSUBTable>(m_Font.GetSubData());
  return GetVerticalGlyph(index, pVertGlyph);
}

int CPDF_CIDFont::GetVerticalGlyph(int index, bool* pVertGlyph) {
  uint32_t vindex = m_pTTGSUBTable->GetVerticalGlyph(index);
  if (!vindex)
    return index;

  index = vindex;
  if (pVertGlyph)
    *pVertGlyph = true;
  return index;
}

int CPDF_CIDFont::GlyphFromCharCode(uint32_t charcode, bool* pVertGlyph) {
  if (pVertGlyph)
    *pVertGlyph = false;

  if (!m_pFontFile && !m_pStreamAcc) {
    uint16_t cid = CIDFromCharCode(charcode);
    wchar_t unicode = 0;
    if (m_bCIDIsGID) {
#if _FX_PLATFORM_ != _FX_PLATFORM_APPLE_
      return cid;
#else
      if (FontStyleIsSymbolic(m_Flags))
        return cid;

      WideString uni_str = UnicodeFromCharCode(charcode);
      if (uni_str.IsEmpty())
        return cid;

      unicode = uni_str[0];
#endif
    } else {
      if (cid && m_pCID2UnicodeMap && m_pCID2UnicodeMap->IsLoaded())
        unicode = m_pCID2UnicodeMap->UnicodeFromCID(cid);
      if (unicode == 0)
        unicode = GetUnicodeFromCharCode(charcode);
      if (unicode == 0) {
        WideString unicode_str = UnicodeFromCharCode(charcode);
        if (!unicode_str.IsEmpty())
          unicode = unicode_str[0];
      }
    }
    FXFT_Face face = m_Font.GetFace();
    if (unicode == 0) {
      if (!m_bAdobeCourierStd)
        return charcode ? static_cast<int>(charcode) : -1;

      charcode += 31;
      bool bMSUnicode = FT_UseTTCharmap(face, 3, 1);
      bool bMacRoman = !bMSUnicode && FT_UseTTCharmap(face, 1, 0);
      int iBaseEncoding = PDFFONT_ENCODING_STANDARD;
      if (bMSUnicode)
        iBaseEncoding = PDFFONT_ENCODING_WINANSI;
      else if (bMacRoman)
        iBaseEncoding = PDFFONT_ENCODING_MACROMAN;
      const char* name =
          GetAdobeCharName(iBaseEncoding, std::vector<ByteString>(), charcode);
      if (!name)
        return charcode ? static_cast<int>(charcode) : -1;

      int index = 0;
      uint16_t name_unicode = PDF_UnicodeFromAdobeName(name);
      if (!name_unicode)
        return charcode ? static_cast<int>(charcode) : -1;

      if (iBaseEncoding == PDFFONT_ENCODING_STANDARD)
        return FXFT_Get_Char_Index(face, name_unicode);

      if (iBaseEncoding == PDFFONT_ENCODING_WINANSI) {
        index = FXFT_Get_Char_Index(face, name_unicode);
      } else {
        ASSERT(iBaseEncoding == PDFFONT_ENCODING_MACROMAN);
        uint32_t maccode =
            FT_CharCodeFromUnicode(FXFT_ENCODING_APPLE_ROMAN, name_unicode);
        index = maccode ? FXFT_Get_Char_Index(face, maccode)
                        : FXFT_Get_Name_Index(face, name);
      }
      if (index == 0 || index == 0xffff)
        return charcode ? static_cast<int>(charcode) : -1;
      return index;
    }
    if (m_Charset == CIDSET_JAPAN1) {
      if (unicode == '\\') {
        unicode = '/';
#if _FX_PLATFORM_ != _FX_PLATFORM_APPLE_
      } else if (unicode == 0xa5) {
        unicode = 0x5c;
#endif
      }
    }
    if (!face)
      return unicode;

    int err = FXFT_Select_Charmap(face, FXFT_ENCODING_UNICODE);
    if (err) {
      int i;
      for (i = 0; i < FXFT_Get_Face_CharmapCount(face); i++) {
        uint32_t ret = FT_CharCodeFromUnicode(
            FXFT_Get_Charmap_Encoding(FXFT_Get_Face_Charmaps(face)[i]),
            static_cast<wchar_t>(charcode));
        if (ret == 0)
          continue;
        FXFT_Set_Charmap(face, FXFT_Get_Face_Charmaps(face)[i]);
        unicode = static_cast<wchar_t>(ret);
        break;
      }
      if (i == FXFT_Get_Face_CharmapCount(face) && i) {
        FXFT_Set_Charmap(face, FXFT_Get_Face_Charmaps(face)[0]);
        unicode = static_cast<wchar_t>(charcode);
      }
    }
    if (FXFT_Get_Face_Charmap(face)) {
      int index = GetGlyphIndex(unicode, pVertGlyph);
      return index != 0 ? index : -1;
    }
    return unicode;
  }

  if (!m_Font.GetFace())
    return -1;

  uint16_t cid = CIDFromCharCode(charcode);
  if (!m_pStreamAcc) {
    if (m_bType1)
      return cid;
    if (m_pFontFile && m_pCMap->IsDirectCharcodeToCIDTableIsEmpty())
      return cid;
    if (m_pCMap->GetCoding() == CIDCODING_UNKNOWN ||
        !FXFT_Get_Face_Charmap(m_Font.GetFace())) {
      return cid;
    }
    if (FXFT_Get_Charmap_Encoding(FXFT_Get_Face_Charmap(m_Font.GetFace())) ==
        FXFT_ENCODING_UNICODE) {
      WideString unicode_str = UnicodeFromCharCode(charcode);
      if (unicode_str.IsEmpty())
        return -1;

      charcode = unicode_str[0];
    }
    return GetGlyphIndex(charcode, pVertGlyph);
  }
  uint32_t byte_pos = cid * 2;
  if (byte_pos + 2 > m_pStreamAcc->GetSize())
    return -1;

  const uint8_t* pdata = m_pStreamAcc->GetData() + byte_pos;
  return pdata[0] * 256 + pdata[1];
}

uint32_t CPDF_CIDFont::GetNextChar(const ByteStringView& pString,
                                   size_t* pOffset) const {
  return m_pCMap->GetNextChar(pString, pOffset);
}

int CPDF_CIDFont::GetCharSize(uint32_t charcode) const {
  return m_pCMap->GetCharSize(charcode);
}

size_t CPDF_CIDFont::CountChar(const ByteStringView& pString) const {
  return m_pCMap->CountChar(pString);
}

int CPDF_CIDFont::AppendChar(char* str, uint32_t charcode) const {
  return m_pCMap->AppendChar(str, charcode);
}

bool CPDF_CIDFont::IsUnicodeCompatible() const {
  if (m_pCID2UnicodeMap && m_pCID2UnicodeMap->IsLoaded() && m_pCMap->IsLoaded())
    return true;
  return m_pCMap->GetCoding() != CIDCODING_UNKNOWN;
}

void CPDF_CIDFont::LoadSubstFont() {
  pdfium::base::CheckedNumeric<int> safeStemV(m_StemV);
  safeStemV *= 5;
  m_Font.LoadSubst(m_BaseFont, !m_bType1, m_Flags,
                   safeStemV.ValueOrDefault(FXFONT_FW_NORMAL), m_ItalicAngle,
                   g_CharsetCPs[m_Charset], IsVertWriting());
}

void CPDF_CIDFont::LoadMetricsArray(const CPDF_Array* pArray,
                                    std::vector<uint32_t>* result,
                                    int nElements) {
  int width_status = 0;
  int iCurElement = 0;
  uint32_t first_code = 0;
  uint32_t last_code = 0;
  for (size_t i = 0; i < pArray->size(); i++) {
    const CPDF_Object* pObj = pArray->GetDirectObjectAt(i);
    if (!pObj)
      continue;

    if (const CPDF_Array* pObjArray = pObj->AsArray()) {
      if (width_status != 1)
        return;
      if (first_code >
          std::numeric_limits<uint32_t>::max() - pObjArray->size()) {
        width_status = 0;
        continue;
      }

      for (size_t j = 0; j < pObjArray->size(); j += nElements) {
        result->push_back(first_code);
        result->push_back(first_code);
        for (int k = 0; k < nElements; k++)
          result->push_back(pObjArray->GetIntegerAt(j + k));
        first_code++;
      }
      width_status = 0;
    } else {
      if (width_status == 0) {
        first_code = pObj->GetInteger();
        width_status = 1;
      } else if (width_status == 1) {
        last_code = pObj->GetInteger();
        width_status = 2;
        iCurElement = 0;
      } else {
        if (!iCurElement) {
          result->push_back(first_code);
          result->push_back(last_code);
        }
        result->push_back(pObj->GetInteger());
        iCurElement++;
        if (iCurElement == nElements)
          width_status = 0;
      }
    }
  }
}

// static
float CPDF_CIDFont::CIDTransformToFloat(uint8_t ch) {
  return (ch < 128 ? ch : ch - 255) * (1.0f / 127);
}

void CPDF_CIDFont::LoadGB2312() {
  m_BaseFont = m_pFontDict->GetStringFor("BaseFont");
  const CPDF_Dictionary* pFontDesc = m_pFontDict->GetDictFor("FontDescriptor");
  if (pFontDesc)
    LoadFontDescriptor(pFontDesc);

  m_Charset = CIDSET_GB1;

  CPDF_CMapManager* manager = GetFontGlobals()->GetCMapManager();
  m_pCMap = manager->GetPredefinedCMap("GBK-EUC-H");
  m_pCID2UnicodeMap = manager->GetCID2UnicodeMap(m_Charset);
  if (!IsEmbedded())
    LoadSubstFont();

  CheckFontMetrics();
  m_bAnsiWidthsFixed = true;
}

const uint8_t* CPDF_CIDFont::GetCIDTransform(uint16_t CID) const {
  if (m_Charset != CIDSET_JAPAN1 || m_pFontFile)
    return nullptr;

  const auto* pEnd = g_Japan1_VertCIDs + FX_ArraySize(g_Japan1_VertCIDs);
  const auto* pTransform = std::lower_bound(
      g_Japan1_VertCIDs, pEnd, CID,
      [](const CIDTransform& entry, uint16_t cid) { return entry.cid < cid; });
  return (pTransform < pEnd && CID == pTransform->cid) ? &pTransform->a
                                                       : nullptr;
}