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CHANGELOG
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---------------
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 by Jan Ondrus
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 by Jan Ondrus
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 by Jan Ondrus
2009.04.29
- Fixed bug in pgm/pbm/ppm detection.
pap8px_v4 by Jan Ondrus
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 by Jan Ondrus
2009.05.04
- Small modifications in exe detection and e8/e9 exe filter
pap8px_v6 by Jan Ondrus
2009.05.05
- fixed: compressing using -8 switch was broken
- fixed: you could use (not working) -9 switch in previous versions
pap8px_v7 by Simon Berger
2009.05.07
- Same fix as done for paqp3. Bmp detection for negative height was broken
pap8px_v8 by Jan Ondrus
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 by Jan Ondrus
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 by Simon Berger
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 by Simon Berger
2009.05.08
- Added tga (8-bit) UNTESTED - please verify. Didn't find any 8-bit tga file
- Fixed tiff reading of offset stored by value (partcount=1)
- Fixed now the tiff stream won't be read if offsets stored in 16-bit (also not worth to implement)
- Removed bad tiff directory check
2009.05.09
- Fixed parsing the tga header.
pap8px_v12 by Jan Ondrus
2009.05.09
-fixed bug in TGA detection
-some code changed in BMP,RGB and TIFF detection
pap8px_v13 by Jan Ondrus
2009.05.09
- fixed: monochrome TGA works again
- some code modified in TIFF detection
pap8px_v14 by Jan Ondrus
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 by Jan Ondrus
2009.05.10
- fixed: WAVE detection can skip metadata now
pap8px_v16 by Jan Ondrus
2009.05.12
- fixed JPEG detection
pap8px_v17 by Jan Ondrus
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 by Jan Ondrus
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 by Jan Ondrus
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 by Simon Berger
2009.05.12
- ?
pap8px_v21 by Jan Ondrus
2009.05.16
- changed some code in wavmodel to improve its speed (no compression ratio changes)
pap8px_v22 by Jan Ondrus
2009.05.18
- fixed bug in wavmodel
pap8px_v23 by Jan Ondrus
2009.05.19
- added experimental S3M modules detection
pap8px_v24 by Jan Ondrus
2009.05.19
- fixed bug in S3M detection (one variable wasn't properly initialized).
pap8px_v25 by Jan Ondrus
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 by Jan Ondrus
2009.05.20
- Block segmentation information is printed before actual compression starts.
- Percentage is displayed during compression.
pap8px_v27 by Jan Ondrus
2009.05.20
- Merged void encode and void compress procedures.
- Block segmentation information is printed during compression now.
pap8px_v28 by Jan Ondrus
2009.05.20
- fixed: string "Compressing..." was printed twice because of default block with size=0 in between jpeg blocks.
pap8px_v29 by Simon Berger
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 by Jan Ondrus
2009.05.21
- Removed some redundant code from compress procedure
- Added direct_encode_block() procedure for repeated task in compress() procedure
pap8px_v31 by Jan Ondrus
2009.05.21
- added experimental AIFF detection and compression
- some small modification in handling 8-bit audio data (wavmodel)
pap8px_v32 by Jan Ondrus
2009.05.22
- Fixed bug in wavmodel.
- You can use -0 to -3 switch for faster wave compression now
pap8px_v32 by Jan Ondrus
2009.05.22
- fixed another bug (fix from v32 wasn't optimal for some files)
pap8px_v34 by Simon Berger
2009.05.22
- Improved AIFF detection.
pap8px_v35 by Jan Ondrus
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 by Jan Ondrus
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 by Jan Ondrus
2009.05.28
- improved exe filter - relative to absolute address conversion is now performed also for conditional jumps (for 0x0f80..0x0f8f instructions)
pap8px_v38 by Jan Ondrus
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 by Jan Ondrus
2009.05.30
- Fixed bug: conflict in CD and EXE detection (exe detected inside cd image could cause bad things)
pap8px_v40 by Jan Ondrus
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 by Jan Ondrus
2009.05.30
- disabled detecting anything else when CD is detected.
pap8px_v42 by Jan Ondrus
2009.05.31
- 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 by Jan Ondrus
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 by Jan Ondrus
2009.06.01
- fixed bug: wrong size of encoded CD block
pap8px_v45 by Jan Ondrus
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 by Jan Ondrus
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 by Jan Ondrus
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 by Jan Ondrus
2009.06.04
- fixed bug in encoding exe blocks: block header was written twice which caused that exeModel was not used
pap8px_v49 by Jan Ondrus
2009.06.04
- fixed bug: wrong percentage when more files were compressed
pap8px_v50 by Jan Ondrus
2009.06.05
- improved detection exe code
pap8px_v51 by Jan Ondrus
2009.06.05
- fixed bug in decode()
pap8px_v52 by Jan Ondrus
2009.06.05
- fixed: in detect() "cdm" has never been initialized
pap8px_v53 by Jan Ondrus
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 by Jan Ondrus
2009.06.11
- added new decompression system from Simon Berger/paq8q
- new style of block segmentation information during compression
pap8px_v55 by Jan Ondrus
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 by Jan Ondrus
2009.06.13
- before value from sum is used it is converted to float: sum=float(sum);
pap8px_v57 by Jan Ondrus
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 by Jan Ondrus
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 by LovePimple
2009.06.19
- Added internal C99 compliant round() function. Compile with '-DLPROUND_ON' to enable.
pap8px_v60 by Jan Ondrus
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 by Jan Ondrus
2009.07.25
- 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 by Jan Ondrus
2009.08.16
- some double brackets removed
- fixed some compiler warnings
pap8px_v63 by Jan Ondrus
2009.08.16
- fixed additional -Wparentheses compiler warnings
pap8px_v64 by Jan Ondrus
2009.08.16
- fixed warnings produced by -DNOASM and -O2 switches in GCC 4.4.0
pap8px_v65 by Jan Ondrus
2009.10.28
- fixed bug: compression/transformation of 24-bit images in BMP format with width not divisible by 4
pap8px_v66 by Jan Ondrus
2009.10.29
- fixed bug: when comparing 24-bit image wrong difference position could be reported
- improved 24-bit image model
pap8px_v67 by Jan Ondrus
2009.11.05
- changes in Mixer initialization and context
- changes in indirectModel and nestModel
pap8px_v68 by Jan Ondrus
2010.01.18
- file list / archive header is compressed
- you can list archive contents with -l switch
pap8px_v69 by Jan Ondrus
2010.04.26
- problem with compressing files in different paths fixed.
pap8px_v70 by Jan Ondrus
2016.03.09
- added zlib recompression from AntiZ (it probably has lot of bugs and can crash randomly)
pap8px_v71 by Jan Ondrus
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 by Jan Ondrus
2016.03.19
- Added base64 transform (from paq8pxd)
- Modified im8bitModel (8-bit) (from paq8pxd)
- Added gif recompression
pap8px_v73 by Jan Ondrus
2016.03.19
- Fixed a bug in base64 transform
pap8px_v74 by Jan Ondrus
2016.03.20
- model changes from paq8pxd
- fix bugs in gif detection/recompression
pap8px_v75 by Jan Ondrus
2016.03.22
- fixed gif routines ("Transform fails")
pap8px_v76 by Márcio Pais
2017.07.09
- improved JPEG model to allow it to account for sub-sampling
pap8px_v77 by Márcio Pais
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 by Márcio Pais
2017.07.10
- fixed a small error in the code
- added 2 new contexts from EMMA to the record model.
pap8px_v78 by Márcio Pais
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 by Márcio Pais
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 by Márcio Pais
2017.07.23
- Fixed the JPEG thumbnail detection bug and other bugs in previous versions.
- Modified the record model.
pap8px_v81 by Márcio Pais
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 by Márcio Pais
2017.07.25
- Made a few simple tweaks to the JPEG model, compression is now even closer to that of EMMA.
pap8px_v83 by Jan Ondrus
2017.07.25
- small changes in jpegmodel
pap8px_v84 by Márcio Pais
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 by Jan Ondrus
2017.07.27
- Small changes in jpegmodel
pap8px_v86 by Márcio Pais
2017.07.28
- Added 2 new contexts in jpegmodel
- Fixed the grayscale detection routine.
pap8px_v87 by Jan Ondrus
2017.07.28
- adjustments of new contexts in jpeg model
pap8px_v88 by Jan Ondrus
2017.08.04
- additional small jpeg model improvements
pap8px_v89 by Márcio Pais
2017.08.05
- a few quick tweaks to the jpeg model contexts, and added a new context.
pap8px_v90 by Jan Ondrus
2017.08.08
- added few more small tweaks to jpeg model
pap8px_v91 by Márcio Pais
2017.08.11
- Small changes to the word model, 24/32bpp image model and the JPEG model
pap8px_v92 by Jan Ondrus
2017.08.12
- more jpeg model tweaks
pap8px_v93 by Jan Ondrus
2017.08.15
- fixed issue with maxpc.pdf (thanks for reporting Stephan Busch)
pap8px_v94 by Márcio Pais
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 by Jan Ondrus
2017.08.16
- added PAM format detection, 32bit-image transformation
pap8px_v96 by Márcio Pais
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 by Márcio Pais
2017.08.17
- bug fixes (thank you Mauro)
- improvements to the XML model
- detects audio in SoundFont .SF2 files.
pap8px_v98 by Márcio Pais
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 by Márcio Pais
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 by Márcio Pais
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 by Márcio Pais
2017.08.26
- a small change to allow paq8px to compress JPEG images created by guetzli
pap8px_v102 by Márcio Pais
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 by Márcio Pais
2017.08.31
- Made a few improvements to the wordModel,
- Created a model for 4bpp images, which are very common in executables.
pap8px_v104 by Márcio Pais
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 by Jan Ondrus
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 by Márcio Pais
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 by Márcio Pais
2017.09.04
- Enabled 8bpp PNG recompression with the 8bpp image model.
- Improved the 24/32bpp image model.
pap8px_v108 by Márcio Pais
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 by Márcio Pais
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 by Márcio Pais
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 by Márcio Pais
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 by Márcio Pais
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 by Márcio Pais
2017.10.10
- Improved the 24/32bpp image model, both for PNG and non-PNG images.
pap8px_v114 by Márcio Pais
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 by Márcio Pais
2017.10.21
- Improved the record model
- Made a few tweaks to the DMC model.
pap8px_v116 by Márcio Pais
2017.10.22
- Fixed a bug in exeModel in function ProcessMode (missing break, thank you Mauro Vezzosi)
paq8px_v117 by Márcio Pais
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
- Improved the 24/32bpp image model, both PNG and non-PNG variants
paq8px_v118 by Márcio Pais
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 by Márcio Pais
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 by Márcio Pais
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 by Márcio Pais
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 by Zoltán Gotthardt
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 by Zoltán Gotthardt
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 by Zoltán Gotthardt
2017.12.09
- Fixed im24bitModel: put back scm10 and Map[29] contextmaps (erroneously removed in paq8px_v121_fixed2).
- Clip, Climp4, LogMeanDiffQt: modified code to be more intuitive (hopefully)
- No model or compression improvements
paq8px_v122 by Zoltán Gotthardt
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 by Márcio Pais
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 by Márcio Pais
2017.12.19
- Improved 8bpp grayscale model (PNG and non-PNG variants)
- Record model now detects and parses dBASE tables
paq8px_v125 by Márcio Pais
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 by Zoltán Gotthardt
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 by Márcio Pais
2017.12.29
- Experimental English stemmer
- Tweaked StationaryMap, added a new context to the 24/32bpp image model
paq8px_v128 by Márcio Pais
2018.01.02
- 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 by Márcio Pais
2018.01.09
- 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 by Zoltán Gotthardt
2018.01.13
- 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 by Zoltán Gotthardt
2018.01.14
- 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 by Márcio Pais
2017.01.14
- Created a new ContextMap variant merging features from both previous variants.
paq8px_v130_fix1 by Zoltán Gotthardt
2018.01.17
- 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 expand_cd_sector(), encode_cd() and decode_cd() functions
paq8px_v130_fix2 by Zoltán Gotthardt
2018.01.18
- 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 by Márcio Pais
2018.01.21
- 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 by Zoltán Gotthardt
2018.01.25
- Restored linux compatibility.
- Eliminated some compiler warnings.
- A little cleanup here and there.
- No model or compression improvements
paq8px_v132_fix1 by Zoltán Gotthardt
2018.01.27
- 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 by Márcio Pais
2018.01.28
- Refactored stemming routines
- New French stemmer (currently unused)
- English stemmer now handles "non/non-" prefixes
paq8px_v134 by Andrew Epstein
2018.02.03