Precomp changes

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22.02.2019 - Precomp v0.4.7

Merge with the excellent preflate library to support recompression of all zLib streams - thanks to Dirk Steinke
Support lzma filters (-lf) for improved compression of executables, audio and structured data (issue #75)
Support for zLib streams larger than 2 GB (see issue #65)
Changed to CMake for easier builds
Fixed crashes when running multiple instances of Precomp in the same directory (see issue #87)
Corrected -pdfbmp statistics (see issue #27)
Discard insufficient partial bZip2 matches (see commit 138c107) - thanks to Gonzalo Munoz
Several minor bugs and memory leaks fixed (thanks to Gonzalo Munoz and Dirk Steinke)
Also see closed issue list at GitHub

25.09.2017 - Precomp v0.4.6

Using liblzma for on-the-fly compression (-cl) - thanks to sftt
Reduced temporary files usage
Much faster intense and brute mode
Intense and brute mode can be combined now for best results
Smoother progress indicator, second progress indicator in lzma mode
Flag -e to preserve file extension (file.ext => file.ext.pcf instead of file.pcf) - thanks to guptaprince
JPG detection faster and more reliable - thanks to Marcio Pais
Updated zlib to 1.2.11
Show Precomp version together with OS type (Linux/Windows) and 32/64 bit information
Fixed crashes on certain files (Issue #52, Issue #59)
Fixed incorrect restoration of a PNG multi file
Also see closed issue list at GitHub

08.05.2016 - Precomp v0.4.5

Updated packJPG to 2.5k, packMP3 to 1.0g
Windows version compiled using GCC/G++ 5.3.0 (before: 4.8.1)
32-bit and 64-bit versions (~10-20% faster on 64-bit machines)
SWF support adjusted to newer versions
MP3 support
MP3 and JPG recompression without temporary files for sizes up to 64 MB
Fixed memory corruption in packJPG that led to crashes
Fixed Base64 streams not being restored correctly in recursion
Also see closed issue list at GitHub

14.01.2016 - Precomp v0.4.4

First open source release
Updated libraries (PackJPG, zLib, bZip2)
Conversion switch -n reports filesize now

01.09.2012 - Precomp v0.4.3

Linux: Added JPG recompression using PackJPG, full compatibility of Windows and Linux PCF files
Linux: zLib routines are now as fast as under Windows
Windows: Locked files can be read now, multiple Precomp instances can work on the same file
Windows: Static zLib and PackJPG linking (no DLLs needed)
Major GIF rewrite, Precomp now recompresses most GIF files completely
New switch -n for conversion of PCF files (bZip2 <-> no compression)
Compression switch -c uses n (none) instead of - now
Improved timing behaviour and activity indicator updates
Updated to PackJPG 2.5, this fixes JPG crashes
JPG misdetections are now visible in statistics
Filenames are stored in their original case now to improve platform compatibility
Fixed a bug with GIF files at positions above 2 GB
Fixed a bug that led to unnecessary data in PCF files
Fixed a bug in Base64 routines that freezed Precomp

25.09.2011 - Precomp v0.4.2

Linux version!
Added CTRL-C detection and temporary files cleanup.
Added activity indicator.
Added optional recursion depth limit for intense and brute mode.
Added longhelp switch.
Renamed -l (recursion level) to -d (recursion depth).
Renamed -slow to -intense.
Changed percentage display to use 2 decimal places.
Streams that can be completely recompressed are processed about 30% faster now.
Various small bugs fixed that led to incorrect recompression.

20.12.2010 - Precomp v0.4.1

ZLIB1.DLL is needed again - static linking led to crashes in some cases.
New switch -c for on-the-fly compression, bZip2 used by default ("-c-" restores old behaviour).
Old switches -c and -m merged to the new -zl ("zlib levels") switch.
Fixed bugs in multi PNG, GIF and penalty bytes handling that led to differences in the recompressed file.
Time output is human readable now.
Various small bugfixes.

21.03.2009 - Precomp v0.4

New switch -mjpeg for MJPEG recompression support.
Added recursion (aka multi-pass).
Added MIME Base64 streams support.
Added bZip2 streams support.
Added batch file errorlevels.
Improved GIF support for partial matches.
Linked zLib library static - ZLIB1.DLL is not needed anymore.
Fixed bug that slowed down Precomp for files larger than 4 GB.

21.07.2008 - Precomp v0.3.8

Files larger than 2 GB supported.
Support for SWF files without slow mode.
Updated packJPG to inofficial version 2.4WIP4 which improves compression ratio for JPGs a bit.
New switches -pdfbmp (see prepaq v2) and -progonly (recompress only progressive JPG files, useful to leave the other ones for PAQ).
Speed up for decompression (30-150%).
Speed up for slow and brute mode (up to 4 times faster).
Dynamic temporary filenames, it is possible now to run multiple Precomp instances in the same directory.
Error message if not enough space left on disk.

15.01.2008 - prepaq v2 (paq8o8pre v2)

Added prepaq v2. Images in PDF files are now wrapped inside a BMP header to improve compression and speed.

08.11.2007 - prepaq (paq8o8pre)

Added prepaq (paq8o8pre) by Jan Ondrus. This combines Precomp 0.3.7 and paq8o8 by Matt Mahoney.

05.11.2007 - Precomp v0.3.7, lprepaq v1.3 - JPG bugfix

JPG detection improved to avoid passing invalid JPGs to packJPG resulting in a crash.

31.10.2007 - Precomp v0.3.7, lprepaq v1.3

Precomp version is now shown if a PCF file was made with a different version.
Added progressive JPG detection.
Updated packJPG to version 2.3 which is 10% faster than version 2.2 and supports progressive JPG files.
Switched compiler for both Precomp and lprepaq to MinGW g++.
Combined lpaq6 by Matt Mahoney and Precomp v0.3.7 to lprepaq v1.3.

01.10.2007 - lprepaq v1.2

Speeded up lprepaq compression speed slightly (around 10%).

29.09.2007 - lprepaq v1.2

Added Precomp switches to lprepaq.
Fixed lprepaq crashes.

22.08.2007 - Precomp v0.3.6, lprepaq v1.1

Improved JPG handling for JPG files with multiple SOI markers.
Combined lpaq1 by Matt Mahoney and Precomp v0.3.6 to lprepaq v1.1.

20.08.2007 - Precomp v0.3.5, lprepaq v1.0

Fixed a bug in GIF handling that sometimes led to a crash (thanks to Stephan Busch).
Combined lpaq1 by Matt Mahoney and Precomp v0.3.5 to lprepaq v1.0.

17.08.2007 - Precomp v0.3.4

Fixed packJPG 2.2 DLL that crashed under Windows XP.

14.08.2007 - Precomp v0.3.4

Updated packJPG to version 2.2 which is faster and compresses better than version 2.0.
After compression, a summary of stream types detected is shown.
Fixed a bug in the GIF routine that lead to a crash sometimes (thanks to Radek "Black_Fox" Liska).

16.07.2007 - Precomp v0.3.3

Added JPG support using packJPG by Matthias Stirner.
Added brute mode.
Speeded up slow mode.
Fixed ignore list that didn't work in v0.3.2.

20.06.2007 - Precomp v0.3.2

Speeded up Precomp a lot (sometimes 10-20 times faster).
Added slow mode.
Added GIF compression.
PNG files with multiple IDAT chunks are now handled correctly ("multiPNG").
Fixed a rare bug that destroyed bit-to-bit-identity.
Fixed some cases in which Precomp Comfort didn't wait for a keypress.
Renamed Precomp.ini to Precomf.ini.
Filename is now stored in lower case.

16.11.2006 - Precomp v0.3.1

Added fast mode.
Added GZip support.
Added several parameters.
Split to normal and comfort version.
Penalty byte method added. Leads to better compression.
Switch -d changed to -r (it is restoring/recompressing, not decompressing).
Temporary files renamed to ~tempX.dat instead of tempX.dat.
Several memory leaks fixed.
PCF header changed.

11.09.2006 - Precomp v0.3

Fastened up Precomp a lot.
Overwrite check added.

06.09.2006 - Precomp v0.2

Fastened up and cleaned the code a bit.
Added stream statistics.
Drag and drop support.
Header for PCF files.

01.09.2006 - Precomp v0.1

ZIP support
Parameters -c and -m added