forked from hxim/paq8px
-
Notifications
You must be signed in to change notification settings - Fork 0
/
CHANGELOG
1621 lines (1173 loc) · 53.3 KB
/
CHANGELOG
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
---------------
VERSION HISTORY
---------------
Newest entries are at the bottom.
Dates are in YYYY.MM.DD format.
DIFFERENCES FROM PAQ7
An .exe model and filter are added. Context maps are improved using 16-bit
checksums to reduce collisions. The state table uses probabilistic updates
for large counts, more states that remember the last bit, and decreased
discounting of the opposite count. It is implemented as a fixed table.
There are also many minor changes.
DIFFERENCES FROM PAQ8A
The user interface supports directory compression and drag and drop.
The preprocessor segments the input into blocks and uses more robust
EXE detection. An indirect context model was added. There is no
dictionary preprocessor like PAQ8B/C/d/E.
DIFFERENCES FROM PAQ8F
Different models, usually from paq8hp*. Also changed rate from 8 to 7. A bug
in Array was fixed that caused the program to silently crash upon exit.
DIFFERENCES FROM PAQ8J
1) Slightly improved sparse model.
2) Added new family of sparse contexts. Each byte mapped to 3-bit value, where
different values corresponds to different byte classes. For example, input
byte 0x00 transformed into 0, all bytes that less then 16 -- into 5, all
punctuation marks (ispunct(c)!=0) -- into 2 etc. Then this flags from 11
previous bytes combined into 32-bit pseudo-context.
All this improvements gives only 62 byte on BOOK1, but on binaries archive size
reduced on 1-2%.
DIFFERENCES FROM PAQ8JA
Introduced distance model. Distance model uses distance to last occurrence
of some anchor char (0x00, space, newline, 0xff), combined with previous
characters as context. This slightly improves compression of files with
variable-width record data.
DIFFERENCES FROM PAQ8JB
Restored recordModel(), broken in paq8hp*. Slightly tuned indirectModel().
DIFFERENCES FROM PAQ8JC
Changed the APMs in the Predictor. Up to a 0.2% improvement for some files.
DIFFERENCES FROM PAQ8JD
Added DMCModel. Removed some redundant models from SparseModel and other
minor tuneups. Changes introduced in PAQ8K were not carried over.
PAQ8L v.2
Changed Mixer::p() to p() to fix a compiler error in Linux
(patched by Indrek Kruusa, Apr. 15, 2007).
DIFFERENCES FROM PAQ8L, PAQ8M
Modified JPEG model by Jan Ondrus (paq8fthis2). The new model improves
compression by using decoded pixel values of current and adjacent blocks
as context. PAQ8M was an earlier version of the new JPEG model
(from paq8fthis).
DIFFERENCES FROM PAQ8N
Improved bmp model. Slightly faster.
DIFFERENCES FROM PAQ8O
Modified JPEG model by Jan Ondrus (paq8fthis4).
Added PGM (grayscale image) model form PAQ8I.
Added grayscale BMP model to PGM model.
Ver. 2 can be compiled using either old or new "for" loop scoping rules.
Added APM and StateMap from LPAQ1
Code optimizations from Enrico Zeidler
Detection of BMP 4,8,24 bit and PGM 8 bit images before compress
On non BMP,PGM,JPEG data mem is lower
Fixed bug in BMP 8-bit detection in other files like .exe
15. oct 2007
Updates JPEG model by Jan Ondrus
PGM detection bug fix
22. oct 2007
improved JPEG model by Jan Ondrus
16. feb 2008
fixed bmp detection bug
added .rgb file support (uncompressed grayscale)
DIFFERENCES FROM PAQ8O9
Added wav Model. Slightly improved bmp model.
DIFFERENCES FROM PAQ8P (i.e. PAQ8PX is born)
pap8px_v0
2009.04.25
- Added nestModel from paq8p3
- Modified wordModel from paq8p3
- Modified .pbm, .pgm, .ppm, .bmp, .rgb detection (from paq8p3)
- Modified WAV model (from paq8p_)
- Modified JPEG model (from paq8p2)
- Added im1bitModel (1-bit) (from paq8p3)
- Added compression of PPM, PBM images (from paq8p3)
- Removed pic model
pap8px_v1
2009.04.26
- Fixed "Transform fails at 79385" when compressing WcgopFsd.dll
- A fix for properly compressing partially corrupted images (e.g. 2359362 bytes 1024x768 bitmap)
- JPEG model wasn't replaced in previous version
pap8px_v2
2009.04.29
- Fixed bug in pgm/pbm/ppm detection.
pap8px_v4
2009.05.01
- There was a problem with compressing files larger than 1 block (512MB for -7 switch, 4MB for -0 switch). Fixed.
pap8px_v5
2009.05.04
- Small modifications in exe detection and e8/e9 exe filter
pap8px_v6
2009.05.05
- fixed: compressing using -8 switch was broken
- fixed: you could use (not working) -9 switch in previous versions
pap8px_v7
2009.05.07
- Same fix as done for paqp3. Bmp detection for negative height was broken
pap8px_v8
2009.05.07
- Some code modified in 1-bit/8-bit/24-bit BMP detection (compression size is different only for 1-bit BMPs = was wrong starting offset in old version)
pap8px_v9
2009.05.08
- now there are only im24bitModel, im8bitModel and im1bitModel instead of im24bitModel, pgmModel, bmpModel8, rgbModel8, bmpModel1 and pbmModel
- all image header detection is removed from models (only place for image detection is detect procedure)
- every image is divided into 2 blocks - IMAGEHDR (header) and IMAGEx (where x is 1, 8 or 24)
- there are additional 8 bytes in compressed stream (for size of IMAGEHDR block and for image width)
- experimental improved tiff detection (should detect uncompressed tiff created by IrfanView)
- RGB detection can detect images with more channels (3 or 4) - channels are compressed independently using im8bitModel (IMAGE8 block)
- during compression can't be printed such info BMP(width x height), instead of it program prints info about blocks: blocktype(size in bytes)
pap8px_v10
2009.05.08
- Added 24-bit tga compression
- Added More checks for Tiff
- Added 1-bit Tiff compression
- Changed many if[...]if[...] to if[...]else if[...] in detect
- Fixed compiling error with MSVC++ because of unknown abs type
pap8px_v11
2009.05.09
- Fixed parsing the tga header.
pap8px_v12
2009.05.09
-fixed bug in TGA detection
-some code changed in BMP,RGB and TIFF detection
pap8px_v13
2009.05.09
- fixed: monochrome TGA works again
- some code modified in TIFF detection
pap8px_v14
2009.05.10
- uncompressed audio 8-bit/16-bit mono/stereo is now compressed in separate AUDIO blocks
- wave file is divided into HDR and AUDIO block (images into HDR and IMAGEx)
- extra information (like width for images) saved in compressed stream is BitsPerSample+Channels (possible values are 9, 10, 17, 18)
- found and fixed problem for images blocks - metadata (=size of block, image width) were compressed using special models (image models)
pap8px_v15
2009.05.10
- fixed: WAVE detection can skip metadata now
pap8px_v16
2009.05.12
- fixed JPEG detection
pap8px_v17
2009.05.12
- removed file segmenting by BLOCKS=MEM*128 (as is in paq8p3) -> entire file is processed as one block
- some source code cleaning (removed some spaces and tabs)
- int wavmodel changed to void wavmodel (not returning value)
pap8px_v18
2009.05.12
- increased tolerance for TIFF files (start of raw image data) from 64kb to 256kb
- experimental MOD file detection and compression
pap8px_v19
2009.05.12
- fixed bug in MOD detection (broken detecting files with 64 patterns) + more MODs can be recognized (those marked with m.K. 8CHN 6CHN FLT4 or FLT8)
pap8px_v20
2009.05.12
- ?
pap8px_v21
2009.05.16
- changed some code in wavmodel to improve its speed (no compression ratio changes)
pap8px_v22
2009.05.18
- fixed bug in wavmodel
pap8px_v23
2009.05.19
- added experimental S3M modules detection
pap8px_v24
2009.05.19
- fixed bug in S3M detection (one variable wasn't properly initialized).
pap8px_v25
2009.05.19
- different handling of 8-bit WAVE data. (samples were interpreted as number 0..255 in previous versions -> current version -128..127) -> improves compression on most files
pap8px_v26
2009.05.20
- Block segmentation information is printed before actual compression starts.
- Percentage is displayed during compression.
pap8px_v27
2009.05.20
- Merged void encode and void compress procedures.
- Block segmentation information is printed during compression now.
pap8px_v28
2009.05.20
- fixed: string "Compressing..." was printed twice because of default block with size=0 in between jpeg blocks.
pap8px_v29
2009.05.21
- Changed the structure of the compress function a lot. It now stops using encode_default instead it compresses directly from input file.
In files without EXE data there is no temporary file anymore and surely also no comparing.
pap8px_v30
2009.05.21
- Removed some redundant code from compress procedure
- Added directEncodeBlock() procedure for repeated task in compress() procedure
pap8px_v31
2009.05.21
- added experimental AIFF detection and compression
- some small modification in handling 8-bit audio data (wavmodel)
pap8px_v32
2009.05.22
- Fixed bug in wavmodel.
- You can use -0 to -3 switch for faster wave compression now
pap8px_v32
2009.05.22
- fixed another bug (fix from v32 wasn't optimal for some files)
pap8px_v34
2009.05.22
- Improved AIFF detection.
pap8px_v35
2009.05.23
- Improved AIFF detection - can skip padding byte correctly
- Corrected handling with 8-bit audio in AIFF format
- Max size of extra blocks before sound data in AIFF is 1024 now
pap8px_v36
2009.05.26
- Removed two writes (and reads) of size of exe-block
- Changes in sparseModel, exeModel, indirectModel, nestModel which should improve compression of executables a bit
pap8px_v37
2009.05.28
- improved exe filter - relative to absolute address conversion is now performed also for conditional jumps (for 0x0f80..0x0f8f instructions)
pap8px_v38
2009.05.30
- Experimental detection and transformation of CD sectors in CD images(only type #1) as done in ECM -> sequence of sectors is detected as new block type : cd
- Functions for computing ECC and EDC are taken from UNECM decoder (GPL) by Neill Corlett
- Ro test detection/transformation you can use -0 switch
pap8px_v39
2009.05.30
- Fixed bug: conflict in CD and EXE detection (exe detected inside cd image could cause bad things)
pap8px_v40
2009.05.30
- limited maximal size of cd block to 38535168 (16384 sectors) so larger cd images are divided into more blocks and user can see progress
pap8px_v41
2009.05.30
- disabled detecting anything else when CD is detected.
pap8px_v42
2009.05.30
- fixed bug: special models for special blocks (image/audio) wasn't used when found after CD block due to wrong/missing size of encoded cd block calculation.
pap8px_v43
2009.06.01
- improved CD sectors transformation - addresses are not saved which improves efficiency of transformation and allow possibility for future detection images/audio inside CD image data
pap8px_v44
2009.06.01
- fixed bug: wrong size of encoded CD block
pap8px_v45
2009.06.01
- detection images/audio/exe/cd/jpeg blocks inside transformed cd block data
- works recursively (maximal deep of recursion is set to 5 - controlled by #define MAX_ITER 5)
- each CD block now contains subblocks
- meaning of percentage is changed - it shows progress for individual block (i think this is bad and will try to return previous behavior in next versions)
pap8px_v46
2009.06.02
- added support for CD-ROM Mode 2 XA (CD-ROM/XA) Form 1 (2352 bytes) sectors
- percentage shows again progress for entire files
pap8px_v47
2009.06.03
- added support for mode 2/form 2 CD sectors (experimental)
- fixed bug in recursion
- fixed bug with wrong detection of special block types in first CD sector
pap8px_v48
2009.06.04
- fixed bug in encoding exe blocks: block header was written twice which caused that exeModel was not used
pap8px_v49
2009.06.04
- fixed bug: wrong percentage when more files were compressed
pap8px_v50
2009.06.05
- improved detection exe code
pap8px_v51
2009.06.05
- fixed bug in decode()
pap8px_v52
2009.06.05
- fixed: in detect() "cdm" has never been initialized
pap8px_v53
2009.06.06
- changed xor-parameter of exe transformation (old: 64=01000000, new: 176=10110000) -> three bytes of absolute address are xored using this value before encoding
pap8px_v54
2009.06.11
- added new decompression system from Simon Berger/paq8q
- new style of block segmentation information during compression
pap8px_v55
2009.06.13
- new version of wavModel
- recordModel is no longer used inside wavModel which may lead to increased speed and small loss in compression ratio.
pap8px_v56
2009.06.13
- before value from sum is used it is converted to float: sum=float(sum);
pap8px_v57
2009.06.13
- converting to float wasn't good idea - this could hurt compression ratio very much -> instead of it sum is rounded in this version: sum=round(sum);
pap8px_v58
2009.06.17
- changed end of exe-block detection (size of no x86 code increased from 4kb to 16kb)
- minor changes in block information output
pap8px_v59
2009.06.19
- Added internal C99 compliant round() function. Compile with '-DLPROUND_ON' to enable.
pap8px_v60
2009.06.20
- improved wavModel
1.) Replaced round(sum) with floor(sum+0.5)
2.) Some changes in contexts (improving compression)
3.) RecordModel is used in wavModel again (because it improves compression mainly for 8bit audio)
pap8px_v61
2009.06.25
- Added a simple color transformation to paq8px. All detected 24-bit image data are transformed. Different formats have different color order RGB (.tiff) vs. BGR (.bmp) -> this could cause different compression for the same image in different formats.
pap8px_v62
2009.08.16
- some double brackets removed
- fixed some compiler warnings
pap8px_v63
2009.08.16
- fixed additional -Wparentheses compiler warnings
pap8px_v64
2009.08.16
- fixed warnings produced by -DNOASM and -O2 switches in GCC 4.4.0
pap8px_v65
2009.10.28
- fixed bug: compression/transformation of 24-bit images in BMP format with width not divisible by 4
pap8px_v66
2009.10.29
- fixed bug: when comparing 24-bit image wrong difference position could be reported
- improved 24-bit image model
pap8px_v67
2009.11.05
- changes in Mixer initialization and context
- changes in indirectModel and nestModel
pap8px_v68
2010.01.18
- file list / archive header is compressed
- you can list archive contents with -l switch
pap8px_v69
2010.04.26
- problem with compressing files in different paths fixed.
pap8px_v70
2016.03.09
- added zlib recompression from AntiZ (it probably has lot of bugs and can crash randomly)
pap8px_v71
2016.03.11
- fixed bug with special image/audio models broken by zlib recompression
- fixed bug with wrong progress display
- some changes in recompressed zlib data header
- added pdfimage support
pap8px_v72
2016.03.19
- Added base64 transform (from paq8pxd)
- Modified im8bitModel (8-bit) (from paq8pxd)
- Added gif recompression
pap8px_v73
2016.03.19
- Fixed a bug in base64 transform
pap8px_v74
2016.03.20
- model changes from paq8pxd
- fix bugs in gif detection/recompression
pap8px_v75
2016.03.22
- fixed gif routines ("Transform fails")
pap8px_v76
2017.07.09
- improved JPEG model to allow it to account for sub-sampling
pap8px_v77
2017.07.10
- modified the record model (new heuristic for checking the candidate lengths, and a new context, both derived from EMMA's record model).
- modified the BMP parsing code to detect embedded DIB's in executable files.
pap8px_v77b
2017.07.10
- fixed a small error in the code
- added 2 new contexts from EMMA to the record model.
pap8px_v78
2017.07.15
- Changed the JPEG model to be able to detect embedded thumbnails and to compress MJPEG video frames (by loading the default huffman tables).
- The recursion level on the thumbnail detection can be configured by a simple constant change, currently it can detect a thumbnail within a thumbnail.
- Added 5 contexts from my grayscale 8bpp model in EMMA to the 8bpp and 24bpp models in paq8px.
pap8px_v79
2017.07.17
- Modified the 24bpp image model to also be able to compress 32bpp images, to be able to account for padding in BMP/DIB images, and changed one of its mixer contexts.
- Changed a mixer context for the 8bpp image model.
pap8px_v80
2017.07.23
- Fixed the JPEG thumbnail detection bug and other bugs in previous versions.
- Modified the record model.
pap8px_v81
2017.07.24
- This version detects if a 8bpp image is grayscale or a color-palette image by parsing the color table, if available
(for PGM files a grayscale image is assumed, the check is made for BMP/DIB and TGA images).
This is done because their characteristics are completely different, so they require different approaches.
- Modified the 8bpp image model to account for both variants,
- And added 5 simple contexts for the color-palette branch.
- Modified a global mixer context, it should give better compression on executable files.
pap8px_v82
2017.07.25
- Made a few simple tweaks to the JPEG model, compression is now even closer to that of EMMA.
pap8px_v83
2017.07.25
- small changes in jpegmodel
pap8px_v84
2017.07.25
- Fixed problems in JPEG model.
- Added a new context to the 24/32bpp image model
- Made a few simple tweaks to the audio model.
pap8px_v85
2017.07.27
- Small changes in jpegmodel
pap8px_v86
2017.07.28
- Added 2 new contexts in jpegmodel
- Fixed the grayscale detection routine.
pap8px_v87
2017.07.28
- adjustments of new contexts in jpeg model
pap8px_v88
2017.08.04
- additional small jpeg model improvements
pap8px_v89
2017.08.05
- a few quick tweaks to the jpeg model contexts, and added a new context.
pap8px_v90
2017.08.08
- added few more small tweaks to jpeg model
pap8px_v91
2017.08.11
- Small changes to the word model, 24/32bpp image model and the JPEG model
pap8px_v92
2017.08.12
- more jpeg model tweaks
pap8px_v93
2017.08.15
- fixed issue with maxpc.pdf (thanks for reporting Stephan Busch)
pap8px_v94
2017.08.16
- fixed issue with VirtualAlloc and VirtualFree when compiling on Mac OSX
- improvements to the nest model
- slight tweak to the exe model
pap8px_v95
2017.08.16
- added PAM format detection, 32bit-image transformation
pap8px_v96
2017.08.17
- fixed the bug in the initialization of the number of mixer inputs.
- added a new experimental model for XML, similar to the one in EMMA.
pap8px_v97
2017.08.17
- bug fixes (thank you Mauro)
- improvements to the XML model
- detects audio in SoundFont .SF2 files.
pap8px_v98
2017.08.18
- This version features a new and much improved x86/x64 model, based on a blending of the old model,
DisFilter by Fabian Giesen (http://www.farbrausch.de/~fg/code/disfilter/) and the x86/x64 model in EMMA.
pap8px_v99
2017.08.19
- Exe model: fixed a few more bugs and made some improvements - including tables for instruction categorization.
- removed all code that made the complexity of the models dependent on the compression level
pap8px_v100
2017.08.23
- Fixed a bug in the exe model
- made the .PAM image parser case-insensitive, just in case some images weren't being detected.
- added 2 contexts from EMMA in the 24/32bpp image model.
pap8px_v101
2017.08.26
- a small change to allow paq8px to compress JPEG images created by guetzli
pap8px_v102
2017.08.29
- Improved the x86/x64 model: added variable context dependent on parsing break point
- Improved the 1bpp image model
- Fixed a few bugs
- The BMP/DIB detection should now handle icons and cursors better
- The PDF parser now handles 1bpp images compressed with Deflate and distinguishes 8bpp grayscale images from 8bpp indexed-color images.
pap8px_v103
2017.08.31
- Made a few improvements to the wordModel,
- Created a model for 4bpp images, which are very common in executables.
pap8px_v104
2017.09.02
- This version can recompress some 24/32bpp PNG images with a proper image model.
- Modified the existing 24/32bpp image model to also compress the filtered PNG pixel data.
- Created a few example contexts designed to model such data
- Tweaked the existing (non-PNG, unfiltered pixel data) model a bit.
pap8px_v105
2017.09.03
- simplified block type handling routines
- because we now have 4-bit image model we should use it for 4-bit pdf image (we used here the 8-bit model instead)
pap8px_v106
2017.09.04
- Improved the 24/32bpp PNG image model.
- Improved the parsers for WAV and TGA.
- The GIF parser now detects if the image is grayscale by analysing the global color palette.
pap8px_v107
2017.09.04
- Enabled 8bpp PNG recompression with the 8bpp image model.
- Improved the 24/32bpp image model.
pap8px_v108
2017.09.06
- Made variants of the 8bpp image model to handle 8bpp PNG images, both grayscale and indexed color.
- Improved the 24/32bpp image model, both the normal and the PNG variants.
pap8px_v109
2017.09.07
- Improved the 24/32bpp image model (both variants, PNG or not), along with the grayscale 8bpp model (also both variants).
- The JPEG model is now called also on header blocks, to allow the detection of some embedded thumbnails in some TIF\RAW images.
pap8px_v110
2017.09.08
- Merged the 8bpp image model indexed color variants (both PNG and non-PNG) and made a few improvements to it.
pap8px_v111
2017.09.09
- Deleted the old 8bpp grayscale model that was being used for non-PNG images and modified the PNG variant to do both.
- Improved the new 8bpp image model so this is now a completely new model, both for grayscale and color-indexed images, PNG or not.
- Improved the 24/32bpp image model, also both PNG or not.
- created a new model for modelling stationary (or nearly so) data
pap8px_v112
2017.09.17
- Pre-training of x86/x64 model with the compiled binary itself
- Pre-training of part of the main model with file "english.dic", if present (optional)
- Improved StationaryMap
- Improved 24/32bpp and 8bpp grayscale image models
pap8px_v113
2017.10.10
- improved the 24/32bpp image model, both for PNG and non-PNG images.
pap8px_v114
2017.10.15
- Made a few more improvements to the 24/32bpp image model, especially on the PNG variant.
- The 8bpp color-indexed model is also slightly improved.
- The heuristic for the record model now attempts to detect 24bpp images, and the model now uses 2 contexts for 8bpp and 24bpp images. This helps on images that aren't detected by the parsers, such as Tif images.
pap8px_v115
2017.10.21
- Improved the record model
- Made a few tweaks to the DMC model.
pap8px_v116
2017.10.22
- Fixed a bug in exeModel in function ProcessMode (missing break, thank you Mauro Vezzosi)
paq8px_v117
2017.10.29
- Fixes assertion failed errors reported by Mauro:
- Line 897 : Expression: i>0
- Line 1957: Expression: (((unsigned long long)cp[i])&63)>=15
- Line 1226: Expression: p>=0 && p<4096
paq8px_v118
2017.11.01
- Bugfixes in recordModel, wordModel, and the 8bpp image model
- Improvements to the record model, the 8bpp and the 24/32bpp image models
paq8px_v119
2017.11.04
- Improved the 8bpp and 24/32bpp image models
- Modified the DEFLATE transform to use a Move-To-Front list to keep the possible zlib parameter combinations ranked by recency and to break as soon as a perfect match is found.
paq8px_v120
2017.11.12
- Implemented a brute-force mode for detection of DEFLATE streams
- Fixed a small bug in the DIB detection code.
- No models were improved
paq8px_v121
2017.11.26
- Fixed incorrect scaling in StationaryMap
- Fixed a bug in pdf detection (zbuf[])
- Made both pre-training modes and also the brute-force DEFLATE stream detection optional.
- No model improvements
paq8px_v121_fixed1
2017.12.05
- Fixed a MS Visual C++ 2015 optimization issue in im24bitModel (division by zero)
- Fixed two minor bugs in class Array
- Fixed a bug in class zLibMTF
- Fixed access denied error when creating temporary files on Windows
- Fixed some #defines in order to compile properly with MS Visual C++
- Eliminated all Visual C++ 2015 compiler warnings (W3) and most MinGW-w64 compiler warnings
- Removed "-level[switches] archive files..." from help screen
- No model or compression improvements
paq8px_v121_fixed2
2017.12.09
- Fixed ilog2 (in recordModel)
- Created an MSVC variant for ilog2
- HashTable: fixed its code to match its documentation (h([i] should return p+i+1, not p+i), updated its references (in im4bitModel)
- HashTable: revised documentation to understand it easier (hopefully)
- SmallStationaryContextMap: changed implementation to be more intuitive (hopefully)
- im24bitModel: minor details in code were changed to be more intuitive (hopefully) and removed the unused scm10 and Map[29] contextmaps
- im8bitModel: minor details in code were changed to be more intuitive (hopefully)
- wavModel: rewritten 1) to use Array 2) peeled 2 expressions from loops 3) changed minor details in code to be more intuitive (hopefully)
- No model or compression improvements
paq8px_v121_fixed3
2017.12.09
- Fixed im24bitModel: put back scm10 and Map[29] contextMaps (erroneously removed in paq8px_v121_fixed2).
- Clip, Clim4, LogMeanDiffQt: modified code to be more intuitive (hopefully)
- No model or compression improvements
paq8px_v122
2017.12.18
- dmcModel: applied the patch from Mauro
- jpegModel: set a faster learning rate
- code(): instead of increasing all lower probabilities ( p+=p<2048; ) we simply forbid only p=0; ( if(p==0)p++; )
paq8px_v123
2017.12.18
- Small improvements to the 24/32bpp image model (PNG and non-PNG variants)
- Adaptive learning rate, available through an optional switch
paq8px_v124
2017.12.19
- Improved 8bpp grayscale model (PNG and non-PNG variants)
- Record model now detects and parses dBASE tables
paq8px_v125
2017.12.23
- Improved 8bpp grayscale image model, slightly improved 24/32bpp image model
- Changes to the zlib transform:
- Fixed bug when zlib doesn't produce any output when using Z_NO_FLUSH
- Early break when no more combinations are left to try, skipping decompression of the remaining stream
- optional switch to skip the 24/32bpp RGB color transform and only perform channel reordering
paq8px_v126
2017.12.26
- Improved IO functions (tmpfile)
- Temporary files are kept in memory
- Windows MSVCRT root folder "access denied" issue is fixed properly with true temporary files
- No model or compression improvements
paq8px_v127
2017.12.29
- Experimental English stemmer
- Tweaked StationaryMap, added a new context to the 24/32bpp image model
paq8px_v128
2017.01.02
- Improved 8bpp grayscale image model (PNG and non-PNG variants)
- Tweaked SmallStationaryMap
- Small changes in English stemmer to allow for compilation with MSVC Fix buffer overflow (thank you Jan Ondrus)
paq8px_v129
2017.01.09
- Slightly improved 24/32bpp image model (PNG and non-PNG variants)
- Horizontal symmetries search for 8bpp model
- New context map and hash table, used in the main model only
- Bug fixes in Array class
paq8px_v129_fix1
2017.01.13
- Fixed "error: use of deleted function" in gcc in Array class (v114-129) reported by Mauro
- Sanity check in makeDir function
- Changed "rb+" to "rb" in FileDisk.open() to enable compressing read-only files
- Assert failed in FileTmp.blockWrite() during zlib decompression when count was 0 and asserts were on (it caused no problems otherwise in release mode); fixed in both blockRead() and blockWrite()
- Assert failed in FileTmp.setpos() when IMAGE8 bmp detection calculated a "detd" value larger than the actual block. Fixed in setpos(); will try to isolate it to let it fix in detect() as well.
- Minor fixes in doc and/or code (Buf, IntBuf, Mixer, ContextMap, matchModel, ContextModel)
- im24bitModel: reverted undesired Visual Studio autoformatting
- No model or compression improvements (archives must be binary compatible with paq8px_v129)
paq8px_v129_fix2
2017.01.14
- fixed redefinition warning for NOMINMAX (when compiling with newer MinGW-w64 versions)
- fixed a couple of "misleading-indentation" (in Mixer) and "suggest parentheses" warnings (in ContextModel) (when compiling with MinGW-w64)
- fixed a "comparison between signed and unsigned integer expressions" warning in ContextMapB64 (when compiling with MinGW-w64)
- fixed the printf() format specifier in Array.chkindex()
- enabled the use of compression level 9 (using 3348 MB RAM)
- removed dependency on compression level in wavModel
- fixed seeking past end of file problems in FileTmp class
paq8px_v130
2017.01.14
- Created a new ContextMap variant merging features from both previous variants.
paq8px_v130_fix1
2017.01.17
- Fixed 4 asserts: assert(true) -> assert(false)
- Fixed decode_cd(): dealing with the "residual" data was buggy
- Removed unnecessary includes
- Corrected comments here and there
- Heavily commented expandCdSector(), encodeCd() and decodeCd() functions
paq8px_v130_fix2
2017.01.18
- On decompression the following message was printed: "FileDisk: unable to open file (No such file or directory)". Fixed.
- Printing more info when FileDisk.create() or FileDisk.createtmp() fails for any reason (name of the file and error: access denied, file not found, etc.)
- Cosmetic fixes in remarks and/or code (Array's chkindex, IntBuf, jpegModel, Encoder, detect(), etc.)
- No model or compression improvements
paq8px_v131
2017.01.21
- Refactored new ContextMap, now used on the exeModel also
- Text pre-training now performs 3 iterations on the dictionary (word list) file, and also trains on an optional expression list file
- New context for the 8bpp grayscale image model
paq8px_v132
2017.01.25
- Restored linux compatibility.
- Eliminated some compiler warnings.
- A little cleanup here and there.
- No model or compression improvements
paq8px_v132_fix1
2017.01.27
- Fixed (finalized) exception handling
- Removed some unnecessary #includes, organised the remaining ones and explained PRIu64
- Separated platform-specific logic from ContextModel::Train() and exeModel::Train(){
- Fixed a "pass thru" bug in FileTmp::blockwrite()
- No model or compression improvements
paq8px_v133
2017.01.28
- Refactored stemming routines
- New French stemmer (currently unused)
- English stemmer now handles "non/non-" prefixes
paq8px_v134
2017.02.03
- Implemented dot_product() and train() in AVX2
- Fixes for proper Mac OSX compilation
paq8px_v135
2017.02.04