mirror of
https://github.com/schnaader/precomp-cpp
synced 2026-08-23 00:23:04 -04:00
2c70814152
Including readme.txt, make scripts for Windows and Linux. Readme.txt changed to reflect new license (Apache 2.0)
661 lines
21 KiB
Text
661 lines
21 KiB
Text
23.07.2013
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Switching windows version to MinGW g++ 4.8.1 for std::thread support. The make script had
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to be changed (-static, -lpthread) to static link pthread (instead of depending on
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libwinpthread-1.dll).
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26.09.2012
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Started version 0.4.4
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Fixed windowbits usage for ZIP, gZip and brute mode streams. Trying windowbits is
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necessary when recompressing only, decompression can use the highest setting 15.
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This speeds up Precomp for these stream types when decompression isn't successful,
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especially brute mode that is 8 times faster for non-deflated data. Also helps
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for rt.jar (2 min 34 s -> 22 s).
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01.09.2012
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Fixed memory leaks in GIF routines
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Major GIF rewrite, routines are now able to recompress most files completely
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19.05.2012
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Added conversion for PCF files (bZip2 <--> no compression).
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05.05.2012
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The Windows version links PackJPG without the need for a DLL.
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The Linux version links PackJPG and supports JPG streams, too.
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25.04.2012
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The Windows version can open files with locked access now and multiple Precomp
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instances can operate on the same file, this already worked in the Linux
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version. Function fileSize64 is using CreateFile different to enable this.
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20.04.2012
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Activity indicator updates every 32 KiB in fast_copy instead of once per call.
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12.04.2012
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Changed copyright year to 2006-2012.
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19.02.2012
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Base64 streams with more than two preceding CRLFs get recompressed now.
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18.12.2011
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Linking zLib 1.2.5 static again under Windows - hopefully correct this time.
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06.12.2011
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Updated to packJPG 2.5, this should fix most of the JPG crashes.
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When PackJPG returns an error, decompressed stream count is increased so JPG misdetections are visible in the statistics.
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15.11.2011
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Fixed a bug that led to unnecessary decompressed data in PCF files when recursion found a stream inside
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another stream that could only be recompressed partially.
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28.10.2011
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Fixed a bug with GIF files at positions > 2 GB where detection failed and slowed down Precomp.
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19.10.2011
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Better time statistic to fit singulars.
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More exact timer on linux, activity indicator updated twice as often.
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16.10.2011
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Fixed bug in Base64 routines that made Precomp freeze.
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30.09.2011
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Filenames aren't stored in lower case anymore to improve platform compatibility.
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29.09.2011
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The function get_time_ms() was called once for every byte in the input file
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which slowed down some things, especially "copying" (-t+) when not in
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verbose mode.
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Linux version speed is doubled by enabling compiler optimization for zLib.
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Compression switch uses n instead of - now.
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28.09.2011
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Started version 0.4.3
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Calls of print_work_sign() in own_fread/own_fwrite.
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25.09.2011
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Added CTRL-C detection and temporary file cleanup.
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Added optional recursion level limit for intense and brute mode.
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Changed percentage display to 2 decimal places.
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Fixed -intense switch.
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Showing an error when -s switch is used without a number.
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Renamed -expert to -longhelp.
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Renamed -l (recursion level) to -d (recursion depth).
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24.09.2011
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First working version that can be compiled for both Linux and Windows.
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Several changes to improve platform compatibility, e.g. functions seek_64/tell_64, get_time_ms.
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Safe fclose operation to only close files once.
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Added activity indicator.
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Added percentage display in verbose mode.
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07.04.2011
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In function recursion_compress, tempfile3 was used, a shortened version of tempfile1.
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Sometimes when a match was found with less identical bytes, tempfile3 was shorter than
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the "best" (longest) tempfile3 and this led to incorrect recompression.
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06.04.2011
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When processing multi PNGs, tempfile0 was opened "w+b" and not deleted before. This may
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cause bugs if new file smaller than previous.
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05.04.2011
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Added "expert" switch to show expert switches.
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Added unstable version message.
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Renamed slow mode to intense mode.
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04.04.2011
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The last recompression step can be skipped if final compression has been found, both for
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try_recompress and try_recompress_bzip2. As compression is the slowest part, this increases
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the speed for streams that can be completely recompressed (about 30% faster).
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03.04.2011
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Fixed a bug in def_part, def_part_skip and def_part_bzip2, in some rare cases pos_out wasn't increased
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when it should've been, this led to incorrect recompression (additional bytes written).
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02.04.2011
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Started version 0.4.2
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Fixed "Penalty bytes were used:" output that showed 0 bytes in some places.
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Changed copyright year to 2006-2011.
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20.12.2010
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Fixed bug - penalty_bytes_len wasn't pushed to recursion stack so recompression
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failed when the length was different at two recursion levels.
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Fixed recursion bug with -cb, otf_bz2_stream mustn't be pushed to the recursion stack
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because we use it between recursion push and pop.
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Fixed bug with GIF precompression - when recompression was only partial possible,
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a second recompress_gif attempt was made that sometimes returned a different block_size
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which wasn't stored correctly.
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Changed copyright year to 2006-2010.
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27.11.2009
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Changed GIF recompression that still used ftell/fseek to fgetpos/fsetpos.
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23.11.2009
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Ignore list is only freed when denit is called at recursion level 0, this caused crashes before.
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22.11.2009
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Precompressing PNG multi streams now determines IDAT pairs count before writing the IDATs so that
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no seeking in the output file is needed.
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Added compression-on-the-fly using bZip2.
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Compression method parameter -c added.
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Time output is more human-readable now.
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24.03.2009
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Switched back to using zlib1.dll as using .a files or even a self-compiled
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zlib1.dll led to crashes (regardless which optimization level used).
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Sorted zlib levels that are prompted as speedup parameters.
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Fixed bug in multi PNG handling. Penalty bytes for chunks after the first one
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where changed incorrect at recompression, in some cases one idat_lengths
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that should've been saved wasn't saved.
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Fixed statistics bug - zLib levels sometimes weren't printed because
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anything_was_used wasn't rescued after recursion.
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23.03.2009
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Removed debug message when disk full.
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Fixed bug in PCF filename creation. ..\test now works and doesn't
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give ..pcf, but ..\test.pcf.
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Speedup parameters are more exact now. -c and -m merged to -zl.
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21.03.2009
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Started version 0.4.1
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Changed error routine to return batch errorlevels.
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Linked zLib static - now zlib1.dll isn't needed anymore.
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Fixed error with progress display for higher recursion levels.
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20.03.2009
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Speeded up Base64 detection.
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19.03.2009
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Fixed a bug with that enabled fast mode if the -mjpeg switch was used.
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Added bZip2 support.
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28.02.2009
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Removed stored ZIP detection as some valid ZIP streams were skipped with it.
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24.02.2009
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Added progress update while in recursion.
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Added MJPG DHT recompression,
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Added -mjpg switch.
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20.02.2009
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Finished recursion.
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Added GIF partial match support.
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Added workaround for PackJPG bug where recompression output file sometimes
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couldn't be accessed by PackJPG.
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Changed version messages to print 0.4 instead of 0.4.0.
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Changed copyright year to 2006-2009.
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19.02.2009
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Added recursion level settings.
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Added numerical value checks for switches.
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12.02.2009
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Added recursion for ZIP streams.
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Fixed compiler warnings.
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04.09.2008
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Fixed error in statistics - if a PDF image streams failed, too much
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recompressed PDF streams were shown.
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14.08.2008
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Fixed ZIP streams without compression (stored), they are skipped and not
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de-/recompressed anymore.
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This speeds up stored ZIP archives.
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Java rt.jar: ~3,3 times faster (515 s -> 153 s)
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07.08.2008
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Changed in_buf_pos from unsigned int to unsigned long (caused slowdown for
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files bigger than 4 GB).
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24.07.2008
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Fixed: JPG recompression used ~temp0.dat instead of tempfile0.
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Adding Motion JPG DHT if JPG huffman table is missing. This adds support
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for MJPEG files.
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21.07.2008
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Started version 0.4
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Added MIME Base64 decoding.
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20.07.2008
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Updated to packJPG 2.4WIP4 that fixes a JPG crash and has better compression.
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Updated decompressed/recompressed streams statistics.
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Splitted recompressed streams count message for PNG and PNG multi.
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Added switch -progonly (useful for PAQ).
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19.06.2008
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Fixed temporary files not being deleted after decompression.
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17.06.2008
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Big speedup for recompression. For PDF, gZip, ZIP, PNG (except multi), SWF,
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slow and brute mode, temporary files were unnecessary.
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FlashMX.pdf: ~1,5 times faster (5638 ms -> 3646 ms)
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PDF Test 1: ~2,7 times faster (4746 ms -> 1752 ms)
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PDF Test 2: ~2,6 times faster (1903 ms -> 721 ms)
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FlashMX.pdf
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-pdfbmp+: ~1,4 times faster (5397 ms -> 3946 ms)
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PNG Test 1: ~1,3 times faster (17735 ms -> 14094 ms)
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06.06.2008
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Uncompressed streams longer than 2 GB are now restored correctly when
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recompressing.
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27.05.2008
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Added error message for unsupported stream type when recompressing.
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Added SWF support without slow mode.
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26.05.2008
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Fixed a bug with penalty bytes that introduced with large file support.
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Changed temporary filenames to be unique so it is possible to run Precomp
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several times in the same directory at the same time now. For this, meta
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temporary files named "~tempXXXXXXXX.dat" are created, XXXXXXXX being a
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8 digit consecutive counter. The counter is increased until the meta file
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does not exist.
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Slow mode and brute mode now check if decompressed length is greater than
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32 bytes and skip if not, this speeds them up a lot. 10 MB random took
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293 s before and reported 75/1010 streams, now 65 s and 0/79. 1024 random
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bytes took 56 s with 8/172, now 19 s and 0/15.
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23.05.2008
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Minimal identical bytes size is 4 for normal streams, 64 for slow or
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brute mode streams.
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"None of the given ... could be used" message also appeared if only GIF
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and JPG streams were recompressed, now flag non_zlib_was_used was added
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to check this.
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Added support for files larger than 2 GB.
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29.02.2008
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Added statistics for PDF image streams (if -pdfbmp is enabled).
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17.01.2008
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Added own_fwrite method that gives an error if there is not enough space
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left on disk.
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15.01.2008
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Added switch -pdfbmp.
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Updated to packJPG 2.3b that fixes unfreed temporary files.
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19.12.2007
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Images in PDF are now preceded by a BMP header to get better results when
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compressing PCF files with PAQ.
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28.11.2007
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Started version 0.3.8
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Updated to packJPG 2.3a. JPG fixes are removed because packJPG handles this
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properly now.
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07.11.2007
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Another JPG fix: Checking for _exactly one_ SOF before SOS.
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05.11.2007
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Set default for minimal identical byte size to 64 in slow mode.
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Added additional checks for DHT and DQT in JPG detection routines to avoid
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passing invalid JPGs without DHT/DQT tables to packJPG 2.3 which led
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to a crash.
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01.11.2007
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Changed global *_penalty_bytes variables. If PRECOMPDLL is set, they must be
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initialized in (p)recompress_file function, if not, calling one these
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functions multiple times results in a crash.
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31.10.2007
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Function compare_files_penalty changed. This could speed up Precomp sometimes
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when many penalty bytes are used.
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Fixed: Sometimes files couldn't be opened because access was denied, this led
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to a crash. Now, the new function tryOpen prevents this. After 2-3 seconds,
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files can be opened, after 15 seconds there is a timeout and an error
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message is shown.
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Added: Precomp version is shown if file was made with a different version.
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Fixed: Appending .pcf only if precompressing, not when recompressing.
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Added progressive JPG detection.
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Updated to packJPG 2.3.
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29.09.2007
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Fixed brute mode parameter parsing.
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27.09.2007
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Started version 0.3.7
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Fixed crashes occuring in lprepaq. The reason was using "new char" with
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strlen of an existing string before strcpy instead of strlen+1.
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22.08.2007
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Started version 0.3.6
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Improved JPG detection. It now detects additional SOI markers and looks for
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additional matching EOI markers.
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20.08.2007
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Released lprepaq v1.0 (combination of lpaq1 and Precomp).
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Fixed a bug in GIF handling that often crashed Precomp with textfiles that
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contained "GIF87a" or "GIF89a".
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17.08.2007
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Fixed Windows XP crash by replacing packJPG 2.2 with a recompiled version.
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14.08.2007
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Started version 0.3.5
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Updated to packJPG 2.2.
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10.08.2007
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Bugfix in GIF precompression: cb wasn't adjusted after success.
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27.07.2007
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Summary of recompressed stream types is shown at denitialization.
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26.07.2007
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Started version 0.3.4
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Added type switches to disable/enable compression types.
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16.07.2007
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Fixed: PackJPG DLL didn't release file handles.
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08.07.2007
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Using packJPG DLL instead of EXE.
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25.06.2007
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Added packJPG support.
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Fixed: Ignore positions work again.
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21.06.2007
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Started version 0.3.3
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FDICT must not be set because dictionary mode can't be supported yet. This
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improves detections, especially in slow mode:
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FlashMX.pdf slow mode
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before: 654 decompressable, 233 recompressed streams, 199 s
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26.958.219 Bytes, UHARC: 2.401.119 Bytes
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after: 298 decompressable, 214 recompressed streams, 47 s
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26.955.223 Bytes, UHARC: 2.401.147 Bytes
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Brute mode added.
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20.06.2007
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Added slow mode to Precomp Comfort
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Renamed precomp.ini to precomf.ini
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Added GIF compression
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Fixed: PNG error fixed
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Fixed: ignore_list is freed
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Fixed: Output file name from a PCF was sometimes read incorrectly
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18.06.2007
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Added slow mode to support raw zLib headers like in old versions.
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Changed date to 2006,2007.
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Fixed: Changed some chars to unsigned, needed for raw zLib type (255).
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29.05.2007
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Fixed: Penalty bytes that were used were not shown correctly in verbose mode.
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Fixed: Best identical decompressed bytes were sometimes saved incorrect. This
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led to subtle differences when processing big files.
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Fixed: Comfort version didn't wait for a key if some of the errors occured.
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Fixed: ZIP files didn't work because saved_cb wasn't set correctly.
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26.05.2007
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Added support for PNGs with multiple IDATs.
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22.05.2007
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Removed checkbuf and optimized file I/O once again.
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Random file 1 MB: ~150 ms precompress, ~20 ms recompress
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Random file 10 MB: ~1800 ms precompress, ~600 ms recompress
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=> speed is now at ~5,5 MB/s for precompression
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Improved GZ detection by checking reserved bytes for being zero.
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03.05.2007
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Filename is now stored in lower case.
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23.04.2007
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Improved file input speed -> very fast for random data (~2,5 MB/s),
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FlashMX.pdf before: 19 s, after: 16 s
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18.04.2007
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Fixed a bug in def_compare, have == 0 wasn't handled correctly.
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09.01.2007
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Enlarged max. PDF header size to 127 bytes instead of 30 bytes.
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05.01.2007
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Started version 0.3.2
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Added more reliable header detection.
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This speeds up Precomp a lot because there are no more false detected
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headers caused by the 2 byte zLib header.
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16.11.2006
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Added fast mode. In this mode, the first found compression is used for all
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streams. When only one level combination was used in non-fast mode, a
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message recommends using fast mode.
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09.11.2006
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Typos corrected.
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Switch -d changed to -r (it is restoring/recompressing, not decompressing).
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Using -d is still valid.
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Default values in <> instead of ().
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Temporary files renamed to ~tempX.dat instead of tempX.dat.
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06.11.2006
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Finished INI file parsing and comfort version.
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31.10.2006
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Added INI file parsing.
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09.10.2006
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Beginning split to normal/comfort version (compiler switch COMFORT)
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Normal version used with command-line and parameters.
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Comfort version used with drag-and-drop and INI file.
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26.09.2006
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----------
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Function def_compare readjusted for use with penalty bytes. Results keep
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good, Precomp is faster again.
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Penalty bytes use fixed memory now. This is faster and more reliable.
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Version number is now stored in header. Decompression isn't done if version
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differs.
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20.09.2006
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----------
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Function def_compare can't be used with penalty bytes and was removed. This
|
|
slows down Precomp again, but results are much better (FlashMX.pcf size is
|
|
now 26,9 MB instead of 21,8 MB).
|
|
Identical bytes and penalty bytes are now shown in verbose mode.
|
|
Penalty byte compare now stops if too much penalty bytes.
|
|
Bugfix: fident wasn't used anymore, but it still needed.
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|
|
|
15.09.2006
|
|
----------
|
|
Removed ESTIMATION code and define, and other unnecessary code.
|
|
Fixed some small memory leaks in input/output file parameter code.
|
|
Fixed 0 byte uncompressed data writes.
|
|
Added penalty bytes if recompressed stream is almost identical. This often
|
|
leads to better compression.
|
|
Added GZip support
|
|
Added ignore list parameter -i. Can be used to ignore input file streams.
|
|
Added minimal identical bytes parameter -s. Can be used to ignore small file
|
|
streams.
|
|
|
|
14.09.2006
|
|
----------
|
|
Path was stored in header which could lead to problems. Now only filename
|
|
is stored.
|
|
zLib header is now skipped and stored in output file (increased by 1)
|
|
like the ZIP header is. This leads to better compression and better
|
|
speed up parameters often.
|
|
Bug in ZIP implementation fixed. Now windowbits != 15 should work, too, and
|
|
no 0-Byte-decompression is tried.
|
|
Decompressed size of streams is shown in verbose mode.
|
|
fident is not needed anymore because of deflate/compare_files merge.
|
|
Changed version number to v0.3.1
|
|
|
|
11.09.2006
|
|
----------
|
|
Much more speed by merging deflate and compare_files to def_compare and
|
|
using a new compare_file_mem function in def_compare. This saves much
|
|
recompressing time, most notably in big compressed streams as in
|
|
FlashMX.pdf (before: 410 s without params, 60 s with params, now: 127 s
|
|
without params, 45 s with params).
|
|
Asking about overwrite if output file exists.
|
|
Changed version number to v0.3
|
|
Released version v0.3
|
|
|
|
06.09.2006
|
|
----------
|
|
Gained a little speed by removing unnecessary input_byte[1] and unnecessary
|
|
reading checkbuf from file twice. This doubles speed for files that can't
|
|
be precompressed well.
|
|
Removed inflate and deflate asserts.
|
|
Added function fast_copy to clean the code and speed up decompression a bit.
|
|
Added verbose mode switch instead of compiler switch DEBUG.
|
|
Changed version number to v0.2
|
|
|
|
04.09.2006
|
|
----------
|
|
Added decompressable and recompressed streams statistics.
|
|
Output file is now given by switch, if none is given, input filename is used
|
|
with extension .pcf. If input file has extension .pcf, new output file name
|
|
is "[...]_pcf.pcf".
|
|
Drag and drop works with single files.
|
|
Header for PCF files is now "PCF"+input filename+0
|
|
|
|
01.09.2006
|
|
----------
|
|
ZIP header is now stored without first 4 bytes ('PK',03,04) in PCF file to
|
|
avoid misleading ZIP detection when precompressing the PCF file again.
|
|
Removed compression level 0. It is STORE, which is not useful to decompress
|
|
because the data remains the same.
|
|
precompd is now available through the '-d' switch in precomp and no longer
|
|
needed.
|
|
Added switches '-c' and '-m' to fasten up compression with files that were
|
|
compressed earlier (because it is known which compression and memory levels
|
|
were used).
|
|
Version number is now v0.1
|
|
|
|
31.08.2006
|
|
----------
|
|
Faster version of compare_files.
|
|
Decompressed data smaller than the compressed data is no longer a match.
|
|
This improves compression of data that is wrongly considered compressed.
|
|
|
|
18.08.2006
|
|
----------
|
|
Added progress display.
|
|
|
|
11.08.2006
|
|
----------
|
|
precompd written to recompress the output files. Program is now ready to use.
|
|
Memory level brute forcing stops when all decompressed data is recompressed.
|
|
|
|
08.08.2006
|
|
----------
|
|
Output data is now written.
|
|
Good results so far, but of no use at the moment, because de-recompressor
|
|
is missing and the process is irreversible.
|
|
Speed is better: ~20 KB/s (without ESTIMATION).
|
|
Name changed to precomp.
|
|
Added memory level brute forcing. Now 9*9 variations are recompressed, speed
|
|
is very slow, but most PDF-data with different window sizes and memory
|
|
levels can be processed.
|
|
|
|
07.08.2006
|
|
----------
|
|
Defined ESTIMATION to control saved bytes estimation.
|
|
Speed so far: ~8 KB/s (without ESTIMATION).
|
|
PNG crash doesn't seem to come from corrupt data, but from much zLib-use.
|
|
Starting at position 352122 where the crash appeared, it works and crashes
|
|
later on (Position 610951). Setting CHUNK to 16 KB doesn't change anything.
|
|
PNG crash solved: missing fclose in compare_files() led to too much
|
|
open files.
|
|
|
|
03.08.2006
|
|
----------
|
|
First version of recomp
|
|
Tries to find zLib streams by checking fcheck to be multiple of 31.
|
|
Once found a stream, it tries to decompress it, then recompresses it.
|
|
If recompression succeeded, identical bytes are shown to the user.
|
|
Tested files so far:
|
|
PDF files - works
|
|
PNG files - works
|
|
ZIP files - doesn't work, because there's no zLib header
|
|
CAB files - doesn't work
|
|
GIF files - doesn't work
|
|
Added saved bytes estimation by calling PAQ with the decompressed data that
|
|
can be recompressed.
|