7-Zip

[avitar]

7-Zip 19.02 alpha was released.
7-Zip for 64-bit Windows x64:
https://7-zip.org/a/7z1902-x64.exe
7-Zip for 32-bit Windows:
https://7-zip.org/a/7z1902.exe
What's new after 7-Zip 19.00:

• 7-Zip now can unpack files encoded with Base64 encoding (b64 filename extension).
• 7-Zip now can use new x86/x64 hardware instructions for SHA-1 and SHA-256, supported
  by AMD Ryzen and latest Intel CPUs: Ice Lake and Goldmont.
  It increases
  
  • the speed of SHA-1/SHA-256 hash value calculation,
  • the speed of encryption/decryption in zip AES,
  • the speed of key derivation for encryption/decryption in 7z/zip/rar archives.
  
  
• The speed of zip AES encryption and 7z/zip/rar AES decryption was increased with
  the following improvements:
  
  • 7-Zip now can use new x86/x64 VAES (AVX Vector AES) instructions, supported by
    Intel Ice Lake CPU.
  • The existing code of x86/x64 AES-NI was improved also.
  
  
• There is 2% speed optimization in 7-Zip benchmark's decompression.
• Some bugs were fixed.

[maadjordan]

7-Zip 19.02 alpha was released.

there was a bug in SHA code

[Gonzalo]

I think mfilter would be a very use case for a standalone executable. Would you mind, @aniskin, to try and compile it with a simple filein > fileout or stdin > stdout interface?
It could be very helpful to test individual filters once becomes possible to discriminate them.

[Aniskin]

MFilter uses some functions provided by 7-Zip so it cannot be compiled as standalone app.

[Gonzalo]

Thanks for the answer. Turns out there is no need after all, though. After just a little tinkering around, i discovered that

7z.exe a -mx0 -m0=mfilter -ms=off -- FILE.m7z FILE

will do the trick just fine.

[pklat]

could it perhaps use CUDA ?

[maadjordan]

MFilter uses some functions provided by 7-Zip so it cannot be compiled as standalone app.

Can kindly you add change-log to each plugin on your website so we know what changed..

[pklat]

is there an option to just store/copy files of given extension and compress others with -mqs and maximum solid lzma1 ?

[Shelwien]

Yes, like by running 7z twice and updating the archive?
However there's no support for solid compression with dynamic codec switching, as it basically requires multipass processing.
For example, how to get lzma to reference the data compressed with ppmd?
Only by having lzma index unpacked data from ppmd... which has to be explicitly implemented and 7-zip doesn't have any support for this.

[Aniskin]

Smart7z plugin is an alternative.

[Aniskin]

MFilter: support of data in base64 format added.

[maadjordan]

Great news. I tested it on MHT samples on https://www.fileformat.info/format/m...mple/index.htm and gain was on (yahoo.mht & microsoft.mht)

also tested on XML files like https://github.com/schnaader/precomp...cacia_High.zip (after unpacked as its gzipped) and it worked ..

[Shelwien]

made an mfilter demo because apparently some people can't RTFM.
http://nishi.dreamhosters.com/u/mfil...o_20191013.rar

[maadjordan]

Mfilter handling of "tar" file in your package does not show good gain and then noticed that many of these jpg files are damaged

[Aniskin]

Mfilter does not show good gain

because of

many most of jpg files are damaged

[maadjordan]

but nevertheless there is a gain

[zubzer0]

7-Zip 20.00 alpha

x86 https://7-zip.org/a/7z2000.exe
x64 https://7-zip.org/a/7z2000-x64.exe

• 7-Zip now supports new optional match finders for LZMA/LZMA2 compression: bt5 and hc5, that can work faster than bt4 and hc4 match finders for the data with big redundancy.
• The compression ratio was improved for Fast and Fastest compression levels with the following default settings:
  
• Fastest level (-mx1) : hc5 match finder with 256 KB dictionary.
  
• Fast level (-mx3) : hc5 match finder with 4 MB dictionary.
• Minor speed optimizations in multithreaded LZMA/LZMA2 compression for Normal/Maximum/Ultra compression levels.
• bzip2 decoding code was updated to support bzip2 archives, created by lbzip2 program.
• Some bugs were fixed.
• New localization: Turkmen.

[opxorj]

How to apply Smart7z 'format' if I invoke 7z via command line?
Format:
3 C Smart7z (experimental) 7z

I ask because the 7z gui doesn't have the facility to create separate archive files for each selected files/directories.
​Or maybe there's a patch for 7z gui to have this function?