-
Notifications
You must be signed in to change notification settings - Fork 284
/
Copy pathpreview.cpp
1161 lines (972 loc) · 41.5 KB
/
preview.cpp
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
// ***************************************************************** -*- C++ -*-
/*
* Copyright (C) 2004-2021 Exiv2 authors
* This program is part of the Exiv2 distribution.
*
* 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., 51 Franklin Street, 5th Floor, Boston, MA 02110-1301 USA.
*/
// *****************************************************************************
// included header files
#include "config.h"
#include <array>
#include <climits>
#include <string>
#include "preview.hpp"
#include "futils.hpp"
#include "enforce.hpp"
#include "safe_op.hpp"
#include "image.hpp"
#include "cr2image.hpp"
#include "jpgimage.hpp"
#include "tiffimage.hpp"
#include "tiffimage_int.hpp"
#include "unused.h"
// *****************************************************************************
namespace {
using namespace Exiv2;
using Exiv2::byte;
/*!
@brief Compare two preview images by number of pixels, if width and height
of both lhs and rhs are available or else by size.
Return true if lhs is smaller than rhs.
*/
bool cmpPreviewProperties(
const PreviewProperties& lhs,
const PreviewProperties& rhs
)
{
uint32_t l = lhs.width_ * lhs.height_;
uint32_t r = rhs.width_ * rhs.height_;
return l < r;
}
/*!
@brief Decode a Hex string.
*/
DataBuf decodeHex(const byte *src, long srcSize);
/*!
@brief Decode a Base64 string.
*/
DataBuf decodeBase64(const std::string &src);
/*!
@brief Decode an Illustrator thumbnail that follows after %AI7_Thumbnail.
*/
DataBuf decodeAi7Thumbnail(const DataBuf &src);
/*!
@brief Create a PNM image from raw RGB data.
*/
DataBuf makePnm(uint32_t width, uint32_t height, const DataBuf &rgb);
/*!
Base class for image loaders. Provides virtual methods for reading properties
and DataBuf.
*/
class Loader {
public:
//! Virtual destructor.
virtual ~Loader() = default;
//! Loader auto pointer
using UniquePtr = std::unique_ptr<Loader>;
//! Create a Loader subclass for requested id
static UniquePtr create(PreviewId id, const Image &image);
//! Check if a preview image with given params exists in the image
virtual bool valid() const { return valid_; }
//! Get properties of a preview image with given params
virtual PreviewProperties getProperties() const;
//! Get a buffer that contains the preview image
virtual DataBuf getData() const = 0;
//! Read preview image dimensions when they are not available directly
virtual bool readDimensions() { return true; }
//! A number of image loaders configured in the loaderList_ table
static PreviewId getNumLoaders();
protected:
//! Constructor. Sets all image properies to unknown.
Loader(PreviewId id, const Image &image);
//! Functions that creates a loader from given parameters
using CreateFunc = UniquePtr (*)(PreviewId, const Image &, int);
//! Structure to list possible loaders
struct LoaderList {
const char *imageMimeType_; //!< Image type for which the loader is valid, 0 matches all images
CreateFunc create_; //!< Function that creates particular loader instance
int parIdx_; //!< Parameter that is passed into CreateFunc
};
//! Table that lists possible loaders. PreviewId is an index to this table.
static const LoaderList loaderList_[];
//! Identifies preview image type
PreviewId id_;
//! Source image reference
const Image &image_;
//! Preview image width
uint32_t width_;
//! Preview image length
uint32_t height_;
//! Preview image size in bytes
uint32_t size_;
//! True if the source image contains a preview image of given type
bool valid_;
};
//! Loader for native previews
class LoaderNative : public Loader {
public:
//! Constructor
LoaderNative(PreviewId id, const Image &image, int parIdx);
//! Get properties of a preview image with given params
PreviewProperties getProperties() const override;
//! Get a buffer that contains the preview image
DataBuf getData() const override;
//! Read preview image dimensions
bool readDimensions() override;
protected:
//! Native preview information
NativePreview nativePreview_;
};
//! Function to create new LoaderNative
Loader::UniquePtr createLoaderNative(PreviewId id, const Image &image, int parIdx);
//! Loader for Jpeg previews that are not read into ExifData directly
class LoaderExifJpeg : public Loader {
public:
//! Constructor
LoaderExifJpeg(PreviewId id, const Image &image, int parIdx);
//! Get properties of a preview image with given params
PreviewProperties getProperties() const override;
//! Get a buffer that contains the preview image
DataBuf getData() const override;
//! Read preview image dimensions
bool readDimensions() override;
protected:
//! Structure that lists offset/size tag pairs
struct Param {
const char* offsetKey_; //!< Offset tag
const char* sizeKey_; //!< Size tag
const char* baseOffsetKey_; //!< Tag that holds base offset or 0
};
//! Table that holds all possible offset/size pairs. parIdx is an index to this table
static const Param param_[];
//! Offset value
uint32_t offset_;
};
//! Function to create new LoaderExifJpeg
Loader::UniquePtr createLoaderExifJpeg(PreviewId id, const Image &image, int parIdx);
//! Loader for Jpeg previews that are read into ExifData
class LoaderExifDataJpeg : public Loader {
public:
//! Constructor
LoaderExifDataJpeg(PreviewId id, const Image &image, int parIdx);
//! Get properties of a preview image with given params
PreviewProperties getProperties() const override;
//! Get a buffer that contains the preview image
DataBuf getData() const override;
//! Read preview image dimensions
bool readDimensions() override;
protected:
//! Structure that lists data/size tag pairs
struct Param {
const char* dataKey_; //!< Data tag
const char* sizeKey_; //!< Size tag
};
//! Table that holds all possible data/size pairs. parIdx is an index to this table
static const Param param_[];
//! Key that points to the Value that contains the JPEG preview in data area
ExifKey dataKey_;
};
//! Function to create new LoaderExifDataJpeg
Loader::UniquePtr createLoaderExifDataJpeg(PreviewId id, const Image &image, int parIdx);
//! Loader for Tiff previews - it can get image data from ExifData or image_.io() as needed
class LoaderTiff : public Loader {
public:
//! Constructor
LoaderTiff(PreviewId id, const Image &image, int parIdx);
//! Get properties of a preview image with given params
PreviewProperties getProperties() const override;
//! Get a buffer that contains the preview image
DataBuf getData() const override;
protected:
//! Name of the group that contains the preview image
const char *group_;
//! Tag that contains image data. Possible values are "StripOffsets" or "TileOffsets"
std::string offsetTag_;
//! Tag that contains data sizes. Possible values are "StripByteCounts" or "TileByteCounts"
std::string sizeTag_;
//! Structure that lists preview groups
struct Param {
const char* group_; //!< Group name
const char* checkTag_; //!< Tag to check or NULL
const char* checkValue_; //!< The preview image is valid only if the checkTag_ has this value
};
//! Table that holds all possible groups. parIdx is an index to this table.
static const Param param_[];
};
//! Function to create new LoaderTiff
Loader::UniquePtr createLoaderTiff(PreviewId id, const Image &image, int parIdx);
//! Loader for JPEG previews stored in the XMP metadata
class LoaderXmpJpeg : public Loader {
public:
//! Constructor
LoaderXmpJpeg(PreviewId id, const Image &image, int parIdx);
//! Get properties of a preview image with given params
PreviewProperties getProperties() const override;
//! Get a buffer that contains the preview image
DataBuf getData() const override;
//! Read preview image dimensions
bool readDimensions() override;
protected:
//! Preview image data
DataBuf preview_;
};
//! Function to create new LoaderXmpJpeg
Loader::UniquePtr createLoaderXmpJpeg(PreviewId id, const Image &image, int parIdx);
// *****************************************************************************
// class member definitions
const Loader::LoaderList Loader::loaderList_[] = {
{ nullptr, createLoaderNative, 0 },
{ nullptr, createLoaderNative, 1 },
{ nullptr, createLoaderNative, 2 },
{ nullptr, createLoaderNative, 3 },
{ nullptr, createLoaderExifDataJpeg, 0 },
{ nullptr, createLoaderExifDataJpeg, 1 },
{ nullptr, createLoaderExifDataJpeg, 2 },
{ nullptr, createLoaderExifDataJpeg, 3 },
{ nullptr, createLoaderExifDataJpeg, 4 },
{ nullptr, createLoaderExifDataJpeg, 5 },
{ nullptr, createLoaderExifDataJpeg, 6 },
{ nullptr, createLoaderExifDataJpeg, 7 },
{ nullptr, createLoaderExifDataJpeg, 8 },
{ "image/x-panasonic-rw2", createLoaderExifDataJpeg, 9 },
{ nullptr, createLoaderExifDataJpeg,10 },
{ nullptr, createLoaderExifDataJpeg,11 },
{ nullptr, createLoaderTiff, 0 },
{ nullptr, createLoaderTiff, 1 },
{ nullptr, createLoaderTiff, 2 },
{ nullptr, createLoaderTiff, 3 },
{ nullptr, createLoaderTiff, 4 },
{ nullptr, createLoaderTiff, 5 },
{ nullptr, createLoaderTiff, 6 },
{ "image/x-canon-cr2", createLoaderTiff, 7 },
{ nullptr, createLoaderExifJpeg, 0 },
{ nullptr, createLoaderExifJpeg, 1 },
{ nullptr, createLoaderExifJpeg, 2 },
{ nullptr, createLoaderExifJpeg, 3 },
{ nullptr, createLoaderExifJpeg, 4 },
{ nullptr, createLoaderExifJpeg, 5 },
{ nullptr, createLoaderExifJpeg, 6 },
{ "image/x-canon-cr2", createLoaderExifJpeg, 7 },
{ nullptr, createLoaderExifJpeg, 8 },
{ nullptr, createLoaderXmpJpeg, 0 }
};
const LoaderExifJpeg::Param LoaderExifJpeg::param_[] = {
{ "Exif.Image.JPEGInterchangeFormat", "Exif.Image.JPEGInterchangeFormatLength", nullptr }, // 0
{ "Exif.SubImage1.JPEGInterchangeFormat", "Exif.SubImage1.JPEGInterchangeFormatLength", nullptr }, // 1
{ "Exif.SubImage2.JPEGInterchangeFormat", "Exif.SubImage2.JPEGInterchangeFormatLength", nullptr }, // 2
{ "Exif.SubImage3.JPEGInterchangeFormat", "Exif.SubImage3.JPEGInterchangeFormatLength", nullptr }, // 3
{ "Exif.SubImage4.JPEGInterchangeFormat", "Exif.SubImage4.JPEGInterchangeFormatLength", nullptr }, // 4
{ "Exif.SubThumb1.JPEGInterchangeFormat", "Exif.SubThumb1.JPEGInterchangeFormatLength", nullptr }, // 5
{ "Exif.Image2.JPEGInterchangeFormat", "Exif.Image2.JPEGInterchangeFormatLength", nullptr }, // 6
{ "Exif.Image.StripOffsets", "Exif.Image.StripByteCounts", nullptr }, // 7
{ "Exif.OlympusCs.PreviewImageStart", "Exif.OlympusCs.PreviewImageLength", "Exif.MakerNote.Offset"} // 8
};
const LoaderExifDataJpeg::Param LoaderExifDataJpeg::param_[] = {
{ "Exif.Thumbnail.JPEGInterchangeFormat", "Exif.Thumbnail.JPEGInterchangeFormatLength" }, // 0
{ "Exif.NikonPreview.JPEGInterchangeFormat", "Exif.NikonPreview.JPEGInterchangeFormatLength" }, // 1
{ "Exif.Pentax.PreviewOffset", "Exif.Pentax.PreviewLength" }, // 2
{ "Exif.PentaxDng.PreviewOffset", "Exif.PentaxDng.PreviewLength" }, // 3
{ "Exif.Minolta.ThumbnailOffset", "Exif.Minolta.ThumbnailLength" }, // 4
{ "Exif.SonyMinolta.ThumbnailOffset", "Exif.SonyMinolta.ThumbnailLength" }, // 5
{ "Exif.Olympus.ThumbnailImage", nullptr }, // 6
{ "Exif.Olympus2.ThumbnailImage", nullptr }, // 7
{ "Exif.Minolta.Thumbnail", nullptr }, // 8
{ "Exif.PanasonicRaw.PreviewImage", nullptr }, // 9
{ "Exif.SamsungPreview.JPEGInterchangeFormat", "Exif.SamsungPreview.JPEGInterchangeFormatLength" }, // 10
{ "Exif.Casio2.PreviewImage", nullptr } // 11
};
const LoaderTiff::Param LoaderTiff::param_[] = {
{ "Image", "Exif.Image.NewSubfileType", "1" }, // 0
{ "SubImage1", "Exif.SubImage1.NewSubfileType", "1" }, // 1
{ "SubImage2", "Exif.SubImage2.NewSubfileType", "1" }, // 2
{ "SubImage3", "Exif.SubImage3.NewSubfileType", "1" }, // 3
{ "SubImage4", "Exif.SubImage4.NewSubfileType", "1" }, // 4
{ "SubThumb1", "Exif.SubThumb1.NewSubfileType", "1" }, // 5
{ "Thumbnail", nullptr, nullptr }, // 6
{ "Image2", nullptr, nullptr } // 7
};
Loader::UniquePtr Loader::create(PreviewId id, const Image &image)
{
if (id < 0 || id >= Loader::getNumLoaders())
return UniquePtr();
if (loaderList_[id].imageMimeType_ &&
std::string(loaderList_[id].imageMimeType_) != image.mimeType())
return UniquePtr();
UniquePtr loader = loaderList_[id].create_(id, image, loaderList_[id].parIdx_);
if (loader.get() && !loader->valid()) loader.reset();
return loader;
}
Loader::Loader(PreviewId id, const Image &image)
: id_(id), image_(image),
width_(0), height_(0),
size_(0),
valid_(false)
{
}
PreviewProperties Loader::getProperties() const
{
PreviewProperties prop;
prop.id_ = id_;
prop.size_ = size_;
prop.width_ = width_;
prop.height_ = height_;
return prop;
}
PreviewId Loader::getNumLoaders()
{
return static_cast<PreviewId> EXV_COUNTOF(loaderList_);
}
LoaderNative::LoaderNative(PreviewId id, const Image &image, int parIdx)
: Loader(id, image)
{
if (!(0 <= parIdx && static_cast<size_t>(parIdx) < image.nativePreviews().size())) return;
nativePreview_ = image.nativePreviews()[parIdx];
width_ = nativePreview_.width_;
height_ = nativePreview_.height_;
valid_ = true;
if (nativePreview_.filter_.empty()) {
size_ = nativePreview_.size_;
} else {
size_ = getData().size_;
}
}
Loader::UniquePtr createLoaderNative(PreviewId id, const Image &image, int parIdx)
{
return Loader::UniquePtr(new LoaderNative(id, image, parIdx));
}
PreviewProperties LoaderNative::getProperties() const
{
PreviewProperties prop = Loader::getProperties();
prop.mimeType_ = nativePreview_.mimeType_;
if (nativePreview_.mimeType_ == "image/jpeg") {
prop.extension_ = ".jpg";
} else if (nativePreview_.mimeType_ == "image/tiff") {
prop.extension_ = ".tif";
} else if (nativePreview_.mimeType_ == "image/x-wmf") {
prop.extension_ = ".wmf";
} else if (nativePreview_.mimeType_ == "image/x-portable-anymap") {
prop.extension_ = ".pnm";
} else {
#ifndef SUPPRESS_WARNINGS
EXV_WARNING << "Unknown native preview format: " << nativePreview_.mimeType_ << "\n";
#endif
prop.extension_ = ".dat";
}
#ifdef EXV_UNICODE_PATH
prop.wextension_ = s2ws(prop.extension_);
#endif
return prop;
}
DataBuf LoaderNative::getData() const
{
if (!valid()) return DataBuf();
BasicIo &io = image_.io();
if (io.open() != 0) {
throw Error(kerDataSourceOpenFailed, io.path(), strError());
}
IoCloser closer(io);
const byte* data = io.mmap();
if (static_cast<long>(io.size()) < nativePreview_.position_ + static_cast<long>(nativePreview_.size_)) {
#ifndef SUPPRESS_WARNINGS
EXV_WARNING << "Invalid native preview position or size.\n";
#endif
return DataBuf();
}
if (nativePreview_.filter_.empty()) {
return DataBuf(data + nativePreview_.position_, static_cast<long>(nativePreview_.size_));
}
if (nativePreview_.filter_ == "hex-ai7thumbnail-pnm") {
const DataBuf ai7thumbnail = decodeHex(data + nativePreview_.position_, static_cast<long>(nativePreview_.size_));
const DataBuf rgb = decodeAi7Thumbnail(ai7thumbnail);
return makePnm(width_, height_, rgb);
}
if (nativePreview_.filter_ == "hex-irb") {
const DataBuf psData = decodeHex(data + nativePreview_.position_, static_cast<long>(nativePreview_.size_));
const byte *record;
uint32_t sizeHdr;
uint32_t sizeData;
if (Photoshop::locatePreviewIrb(psData.pData_, psData.size_, &record, &sizeHdr, &sizeData) != 0) {
#ifndef SUPPRESS_WARNINGS
EXV_WARNING << "Missing preview IRB in Photoshop EPS preview.\n";
#endif
return DataBuf();
}
return DataBuf(record + sizeHdr + 28, sizeData - 28);
}
throw Error(kerErrorMessage, "Invalid native preview filter: " + nativePreview_.filter_);
}
bool LoaderNative::readDimensions()
{
if (!valid()) return false;
if (width_ != 0 || height_ != 0) return true;
const DataBuf data = getData();
if (data.size_ == 0) return false;
try {
Image::UniquePtr image = ImageFactory::open(data.pData_, data.size_);
if (image.get() == nullptr) return false;
image->readMetadata();
width_ = image->pixelWidth();
height_ = image->pixelHeight();
} catch (const AnyError& /* error */) {
#ifndef SUPPRESS_WARNINGS
EXV_WARNING << "Invalid native preview image.\n";
#endif
return false;
}
return true;
}
LoaderExifJpeg::LoaderExifJpeg(PreviewId id, const Image &image, int parIdx) : Loader(id, image), offset_(0)
{
const ExifData &exifData = image_.exifData();
auto pos = exifData.findKey(ExifKey(param_[parIdx].offsetKey_));
if (pos != exifData.end() && pos->count() > 0) {
offset_ = pos->toLong();
}
size_ = 0;
pos = exifData.findKey(ExifKey(param_[parIdx].sizeKey_));
if (pos != exifData.end() && pos->count() > 0) {
size_ = pos->toLong();
}
if (offset_ == 0 || size_ == 0) return;
if (param_[parIdx].baseOffsetKey_) {
pos = exifData.findKey(ExifKey(param_[parIdx].baseOffsetKey_));
if (pos != exifData.end() && pos->count() > 0) {
offset_ += pos->toLong();
}
}
if (Safe::add(offset_, size_) > static_cast<uint32_t>(image_.io().size()))
return;
valid_ = true;
}
Loader::UniquePtr createLoaderExifJpeg(PreviewId id, const Image &image, int parIdx)
{
return Loader::UniquePtr(new LoaderExifJpeg(id, image, parIdx));
}
PreviewProperties LoaderExifJpeg::getProperties() const
{
PreviewProperties prop = Loader::getProperties();
prop.mimeType_ = "image/jpeg";
prop.extension_ = ".jpg";
#ifdef EXV_UNICODE_PATH
prop.wextension_ = EXV_WIDEN(".jpg");
#endif
return prop;
}
DataBuf LoaderExifJpeg::getData() const
{
if (!valid()) return DataBuf();
BasicIo &io = image_.io();
if (io.open() != 0) {
throw Error(kerDataSourceOpenFailed, io.path(), strError());
}
IoCloser closer(io);
const Exiv2::byte* base = io.mmap();
return DataBuf(base + offset_, size_);
}
bool LoaderExifJpeg::readDimensions()
{
if (!valid()) return false;
if (width_ || height_) return true;
BasicIo &io = image_.io();
if (io.open() != 0) {
throw Error(kerDataSourceOpenFailed, io.path(), strError());
}
IoCloser closer(io);
const Exiv2::byte* base = io.mmap();
try {
Image::UniquePtr image = ImageFactory::open(base + offset_, size_);
if (image.get() == nullptr) return false;
image->readMetadata();
width_ = image->pixelWidth();
height_ = image->pixelHeight();
}
catch (const AnyError& /* error */ ) {
#ifndef SUPPRESS_WARNINGS
EXV_WARNING << "Invalid JPEG preview image.\n";
#endif
return false;
}
return true;
}
LoaderExifDataJpeg::LoaderExifDataJpeg(PreviewId id, const Image &image, int parIdx)
: Loader(id, image),
dataKey_(param_[parIdx].dataKey_)
{
auto pos = image_.exifData().findKey(dataKey_);
if (pos != image_.exifData().end()) {
size_ = pos->sizeDataArea(); // indirect data
if (size_ == 0 && pos->typeId() == undefined)
size_ = pos->size(); // direct data
}
if (size_ == 0) return;
valid_ = true;
}
Loader::UniquePtr createLoaderExifDataJpeg(PreviewId id, const Image &image, int parIdx)
{
return Loader::UniquePtr(new LoaderExifDataJpeg(id, image, parIdx));
}
PreviewProperties LoaderExifDataJpeg::getProperties() const
{
PreviewProperties prop = Loader::getProperties();
prop.mimeType_ = "image/jpeg";
prop.extension_ = ".jpg";
#ifdef EXV_UNICODE_PATH
prop.wextension_ = EXV_WIDEN(".jpg");
#endif
return prop;
}
DataBuf LoaderExifDataJpeg::getData() const
{
if (!valid()) return DataBuf();
auto pos = image_.exifData().findKey(dataKey_);
if (pos != image_.exifData().end()) {
DataBuf buf = pos->dataArea(); // indirect data
if (buf.size_ == 0) { // direct data
buf = DataBuf(pos->size());
pos->copy(buf.pData_, invalidByteOrder);
}
buf.pData_[0] = 0xff; // fix Minolta thumbnails with invalid jpeg header
return buf;
}
return DataBuf();
}
bool LoaderExifDataJpeg::readDimensions()
{
if (!valid()) return false;
DataBuf buf = getData();
if (buf.size_ == 0) return false;
try {
Image::UniquePtr image = ImageFactory::open(buf.pData_, buf.size_);
if (image.get() == nullptr) return false;
image->readMetadata();
width_ = image->pixelWidth();
height_ = image->pixelHeight();
}
catch (const AnyError& /* error */ ) {
return false;
}
return true;
}
LoaderTiff::LoaderTiff(PreviewId id, const Image &image, int parIdx)
: Loader(id, image),
group_(param_[parIdx].group_)
{
const ExifData &exifData = image_.exifData();
int offsetCount = 0;
ExifData::const_iterator pos;
// check if the group_ contains a preview image
if (param_[parIdx].checkTag_) {
pos = exifData.findKey(ExifKey(param_[parIdx].checkTag_));
if (pos == exifData.end()) return;
if (param_[parIdx].checkValue_ && pos->toString() != param_[parIdx].checkValue_) return;
}
pos = exifData.findKey(ExifKey(std::string("Exif.") + group_ + ".StripOffsets"));
if (pos != exifData.end()) {
offsetTag_ = "StripOffsets";
sizeTag_ = "StripByteCounts";
offsetCount = pos->value().count();
}
else {
pos = exifData.findKey(ExifKey(std::string("Exif.") + group_ + ".TileOffsets"));
if (pos == exifData.end()) return;
offsetTag_ = "TileOffsets";
sizeTag_ = "TileByteCounts";
offsetCount = pos->value().count();
}
pos = exifData.findKey(ExifKey(std::string("Exif.") + group_ + '.' + sizeTag_));
if (pos == exifData.end()) return;
if (offsetCount != pos->value().count()) return;
for (int i = 0; i < offsetCount; i++) {
size_ += pos->toLong(i);
}
if (size_ == 0) return;
pos = exifData.findKey(ExifKey(std::string("Exif.") + group_ + ".ImageWidth"));
if (pos != exifData.end() && pos->count() > 0) {
width_ = pos->toLong();
}
pos = exifData.findKey(ExifKey(std::string("Exif.") + group_ + ".ImageLength"));
if (pos != exifData.end() && pos->count() > 0) {
height_ = pos->toLong();
}
if (width_ == 0 || height_ == 0) return;
valid_ = true;
}
Loader::UniquePtr createLoaderTiff(PreviewId id, const Image &image, int parIdx)
{
return Loader::UniquePtr(new LoaderTiff(id, image, parIdx));
}
PreviewProperties LoaderTiff::getProperties() const
{
PreviewProperties prop = Loader::getProperties();
prop.mimeType_ = "image/tiff";
prop.extension_ = ".tif";
#ifdef EXV_UNICODE_PATH
prop.wextension_ = EXV_WIDEN(".tif");
#endif
return prop;
}
DataBuf LoaderTiff::getData() const
{
const ExifData &exifData = image_.exifData();
ExifData preview;
// copy tags
for (auto &&pos : exifData) {
if (pos.groupName() == group_) {
/*
Write only the necessary TIFF image tags
tags that especially could cause problems are:
"NewSubfileType" - the result is no longer a thumbnail, it is a standalone image
"Orientation" - this tag typically appears only in the "Image" group. Deleting it ensures
consistent result for all previews, including JPEG
*/
uint16_t tag = pos.tag();
if (tag != 0x00fe && tag != 0x00ff && Internal::isTiffImageTag(tag, Internal::ifd0Id)) {
preview.add(ExifKey(tag, "Image"), &pos.value());
}
}
}
Value &dataValue = const_cast<Value&>(preview["Exif.Image." + offsetTag_].value());
if (dataValue.sizeDataArea() == 0) {
// image data are not available via exifData, read them from image_.io()
BasicIo &io = image_.io();
if (io.open() != 0) {
throw Error(kerDataSourceOpenFailed, io.path(), strError());
}
IoCloser closer(io);
const Exiv2::byte* base = io.mmap();
const Value &sizes = preview["Exif.Image." + sizeTag_].value();
if (sizes.count() == dataValue.count()) {
if (sizes.count() == 1) {
// this saves one copying of the buffer
uint32_t offset = dataValue.toLong(0);
uint32_t size = sizes.toLong(0);
if (Safe::add(offset, size) <= static_cast<uint32_t>(io.size()))
dataValue.setDataArea(base + offset, size);
}
else {
// FIXME: the buffer is probably copied twice, it should be optimized
enforce(size_ <= static_cast<uint32_t>(io.size()), kerCorruptedMetadata);
DataBuf buf(size_);
uint32_t idxBuf = 0;
for (int i = 0; i < sizes.count(); i++) {
uint32_t offset = dataValue.toLong(i);
uint32_t size = sizes.toLong(i);
enforce(Safe::add(idxBuf, size) < size_, kerCorruptedMetadata);
if (size!=0 && Safe::add(offset, size) <= static_cast<uint32_t>(io.size()))
memcpy(&buf.pData_[idxBuf], base + offset, size);
idxBuf += size;
}
dataValue.setDataArea(buf.pData_, buf.size_);
}
}
}
// Fix compression value in the CR2 IFD2 image
if (0 == strcmp(group_, "Image2") && image_.mimeType() == "image/x-canon-cr2") {
preview["Exif.Image.Compression"] = uint16_t(1);
}
// write new image
MemIo mio;
IptcData emptyIptc;
XmpData emptyXmp;
TiffParser::encode(mio, nullptr, 0, Exiv2::littleEndian, preview, emptyIptc, emptyXmp);
return DataBuf(mio.mmap(), static_cast<long>(mio.size()));
}
LoaderXmpJpeg::LoaderXmpJpeg(PreviewId id, const Image &image, int parIdx)
: Loader(id, image)
{
(void)parIdx;
const XmpData &xmpData = image_.xmpData();
std::string prefix = "xmpGImg";
if (xmpData.findKey(XmpKey("Xmp.xmp.Thumbnails[1]/xapGImg:image")) != xmpData.end()) {
prefix = "xapGImg";
}
auto imageDatum = xmpData.findKey(XmpKey("Xmp.xmp.Thumbnails[1]/" + prefix + ":image"));
if (imageDatum == xmpData.end()) return;
auto formatDatum = xmpData.findKey(XmpKey("Xmp.xmp.Thumbnails[1]/" + prefix + ":format"));
if (formatDatum == xmpData.end()) return;
auto widthDatum = xmpData.findKey(XmpKey("Xmp.xmp.Thumbnails[1]/" + prefix + ":width"));
if (widthDatum == xmpData.end()) return;
auto heightDatum = xmpData.findKey(XmpKey("Xmp.xmp.Thumbnails[1]/" + prefix + ":height"));
if (heightDatum == xmpData.end()) return;
if (formatDatum->toString() != "JPEG") return;
width_ = widthDatum->toLong();
height_ = heightDatum->toLong();
preview_ = decodeBase64(imageDatum->toString());
size_ = static_cast<uint32_t>(preview_.size_);
valid_ = true;
}
Loader::UniquePtr createLoaderXmpJpeg(PreviewId id, const Image &image, int parIdx)
{
return Loader::UniquePtr(new LoaderXmpJpeg(id, image, parIdx));
}
PreviewProperties LoaderXmpJpeg::getProperties() const
{
PreviewProperties prop = Loader::getProperties();
prop.mimeType_ = "image/jpeg";
prop.extension_ = ".jpg";
#ifdef EXV_UNICODE_PATH
prop.wextension_ = EXV_WIDEN(".jpg");
#endif
return prop;
}
DataBuf LoaderXmpJpeg::getData() const
{
if (!valid()) return DataBuf();
return DataBuf(preview_.pData_, preview_.size_);
}
bool LoaderXmpJpeg::readDimensions()
{
return valid();
}
DataBuf decodeHex(const byte *src, long srcSize)
{
// create decoding table
byte invalid = 16;
std::array<byte, 256> decodeHexTable;
decodeHexTable.fill(invalid);
for (byte i = 0; i < 10; i++) decodeHexTable[static_cast<byte>('0') + i] = i;
for (byte i = 0; i < 6; i++) decodeHexTable[static_cast<byte>('A') + i] = i + 10;
for (byte i = 0; i < 6; i++) decodeHexTable[static_cast<byte>('a') + i] = i + 10;
// calculate dest size
long validSrcSize = 0;
for (long srcPos = 0; srcPos < srcSize; srcPos++) {
if (decodeHexTable[src[srcPos]] != invalid) validSrcSize++;
}
const long destSize = validSrcSize / 2;
// allocate dest buffer
DataBuf dest(destSize);
// decode
for (long srcPos = 0, destPos = 0; destPos < destSize; destPos++) {
byte buffer = 0;
for (int bufferPos = 1; bufferPos >= 0 && srcPos < srcSize; srcPos++) {
byte srcValue = decodeHexTable[src[srcPos]];
if (srcValue == invalid) continue;
buffer |= srcValue << (bufferPos * 4);
bufferPos--;
}
dest.pData_[destPos] = buffer;
}
return dest;
}
const char encodeBase64Table[64 + 1] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
DataBuf decodeBase64(const std::string& src)
{
const size_t srcSize = src.size();
// create decoding table
unsigned long invalid = 64;
std::array<unsigned long, 256> decodeBase64Table;
decodeBase64Table.fill(invalid);
for (unsigned long i = 0; i < 64; i++)
decodeBase64Table[static_cast<unsigned char>(encodeBase64Table[i])] = i;
// calculate dest size
unsigned long validSrcSize = 0;
for (unsigned long srcPos = 0; srcPos < srcSize; srcPos++) {
if (decodeBase64Table[static_cast<unsigned char>(src[srcPos])] != invalid)
validSrcSize++;
}
if (validSrcSize > ULONG_MAX / 3) return DataBuf(); // avoid integer overflow
const unsigned long destSize = (validSrcSize * 3) / 4;
// allocate dest buffer
if (destSize > LONG_MAX) return DataBuf(); // avoid integer overflow
DataBuf dest(static_cast<long>(destSize));
// decode
for (unsigned long srcPos = 0, destPos = 0; destPos < destSize;) {
unsigned long buffer = 0;
for (int bufferPos = 3; bufferPos >= 0 && srcPos < srcSize; srcPos++) {
unsigned long srcValue = decodeBase64Table[static_cast<unsigned char>(src[srcPos])];
if (srcValue == invalid) continue;
buffer |= srcValue << (bufferPos * 6);
bufferPos--;
}
for (int bufferPos = 2; bufferPos >= 0 && destPos < destSize; bufferPos--, destPos++) {
dest.pData_[destPos] = static_cast<byte>((buffer >> (bufferPos * 8)) & 0xFF);
}
}
return dest;
}
DataBuf decodeAi7Thumbnail(const DataBuf &src)
{
const byte *colorTable = src.pData_;
const long colorTableSize = 256 * 3;
if (src.size_ < colorTableSize) {
#ifndef SUPPRESS_WARNINGS
EXV_WARNING << "Invalid size of AI7 thumbnail: " << src.size_ << "\n";
#endif
return DataBuf();
}
const byte *imageData = src.pData_ + colorTableSize;
const long imageDataSize = src.size_ - colorTableSize;
const bool rle = (imageDataSize >= 3 && imageData[0] == 'R' && imageData[1] == 'L' && imageData[2] == 'E');
std::string dest;
for (long i = rle ? 3 : 0; i < imageDataSize;) {
byte num = 1;
byte value = imageData[i++];
if (rle && value == 0xFD) {
if (i >= imageDataSize) {
#ifndef SUPPRESS_WARNINGS
EXV_WARNING << "Unexpected end of image data at AI7 thumbnail.\n";
#endif
return DataBuf();
}
value = imageData[i++];
if (value != 0xFD) {
if (i >= imageDataSize) {
#ifndef SUPPRESS_WARNINGS
EXV_WARNING << "Unexpected end of image data at AI7 thumbnail.\n";
#endif
return DataBuf();
}
num = value;
value = imageData[i++];
}