README

This is the Github Page of 7-Zip ZS with support of additional Codecs. The library used therefore is located here: Multithreading Library

You can install it in two ways:

1. complete setup with additions within the GUI and a modified Explorer context menu
2. only the codec plugin that goes to your existing 7-Zip installation (no GUI changes and no additional Hashers)

Status

Codec overview

1. Zstandard v1.4.9 is a real-time compression algorithm, providing high compression ratios. It offers a very wide range of compression / speed trade-off, while being backed by a very fast decoder.

   • Levels: 1..22

2. Brotli v.1.0.9 is a generic-purpose lossless compression algorithm that compresses data using a combination of a modern variant of the LZ77 algorithm, Huffman coding and 2nd order context modeling, with a compression ratio comparable to the best currently available general-purpose compression methods. It is similar in speed with deflate but offers more dense compression.

   • Levels: 0..11

3. LZ4 v1.9.3 is lossless compression algorithm, providing compression speed at 400 MB/s per core (0.16 Bytes/cycle). It features an extremely fast decoder, with speed in multiple GB/s per core (0.71 Bytes/cycle). A high compression derivative, called LZ4_HC, is available, trading customizable CPU time for compression ratio.

   • Levels: 1..12

4. LZ5 v1.5 is a modification of LZ4 which gives a better ratio at cost of slower compression and decompression.

   • Levels: 1..15

5. Lizard v1.0 is an efficient compressor with very fast decompression. It achieves compression ratio that is comparable to zip/zlib and zstd/brotli (at low and medium compression levels) at decompression speed of 1000 MB/s and faster.

   • Levels 10..19 (fastLZ4) are designed to give about 10% better decompression speed than LZ4
   • Levels 20..29 (LIZv1) are designed to give better ratio than LZ4 keeping 75% decompression speed
   • Levels 30..39 (fastLZ4 + Huffman) adds Huffman coding to fastLZ4
   • Levels 40..49 (LIZv1 + Huffman) give the best ratio, comparable to zlib and low levels of zstd/brotli, but with a faster decompression speed

6. Fast LZMA2 v1.0.1 is a LZMA2 compression algorithm, 20% to 100% faster than normal LZMA2 at levels 5 and above, but with a slightly lower compression ratio. It uses a parallel buffered radix matchfinder and some optimizations from Zstandard. The codec uses much less additional memory per thread than standard LZMA2.

   • Levels: 1..9

7-Zip Zstandard Edition (full setup, with GUI and Explorer integration)

Installation (via setup)

1. download the setup from here 7-Zip ZS Releases
2. install it, like the default 7-Zip
3. use it ;)
4. you may check, if the 7-Zip can deal with Zstandard or other codecs via this command: 7z.exe i

The output should look like this:

7-Zip 19.00 ZS v1.4.9 R1 (x64) : Copyright (c) 1999-2019 Igor Pavlov, 2016-2021 Tino Reichardt : 2021-03-17

Libs:
 0  c:\Program Files\7-Zip-Zstandard\7z.dll
 1  C:\Program Files\7-Zip-Zstandard\Codecs\Iso7z.64.dll
 
Formats:
...
 0 CK            xz       xz txz (.tar) FD 7 z X Z 00
 0               Z        z taz (.tar)  1F 9D
 0 CK            zstd     zst tzstd (.tar) 0 x F D 2 F B 5 2 5 . . 0 x F D 2 F B 5 2 8 00
 0 C   F         7z       7z            7 z BC AF ' 1C
 0     F         Cab      cab           M S C F 00 00 00 00
...

Codecs:
 0 4ED  303011B BCJ2
 0  ED  3030103 BCJ
 0  ED  3030205 PPC
 0  ED  3030401 IA64
 0  ED  3030501 ARM
 0  ED  3030701 ARMT
 0  ED  3030805 SPARC
 0  ED    20302 Swap2
 0  ED    20304 Swap4
 0  ED    40202 BZip2
 0  ED        0 Copy
 0  ED    40109 Deflate64
 0  ED    40108 Deflate
 0  ED        3 Delta
 0  ED       21 LZMA2
 0  ED    30101 LZMA
 0  ED    30401 PPMD
 0   D    40301 Rar1
 0   D    40302 Rar2
 0   D    40303 Rar3
 0   D    40305 Rar5
 0  ED  4F71102 BROTLI
 0  ED  4F71104 LZ4
 0  ED  4F71106 LIZARD
 0  ED  4F71105 LZ5
 0  ED  4F71101 ZSTD
 0  ED       21 FLZMA2
 0  ED  6F10701 7zAES
 0  ED  6F00181 AES256CBC
 1 3ED  4F712FF RawSplitter

Hashers:
 0    4        1 CRC32
 0   16      205 MD2
 0   16      206 MD4
 0   16      207 MD5
 0   20      201 SHA1
 0   32        A SHA256
 0   48      208 SHA384
 0   64      209 SHA512
 0    4      203 XXH32
 0    8      204 XXH64
 0    8        4 CRC64
 0   32      202 BLAKE2sp

Usage and features of the full installation

• compression and decompression for Brotli, Lizard, LZ4, LZ5 and Zstandard within the 7-Zip container format
• compression and decompression of Lizard (.liz), LZ4 (.lz4), LZ5 (.lz5) and Zstandard (.zst) files
• handling of ZIP files with Zstandard compression
• included lzip decompression support, patch from: https://download.savannah.gnu.org/releases/lzip/7zip/
• explorer context menu: "Add to xy.7z" will use all parameters of the last "Add to Archive" compression dialog (this includes: method, level, dictionary, blocksize, threads and paramters input box)
• squashfs files with LZ4 or Zstandard compression can be handled
• several history settings aren't stored by default, look here for some info about that, you can restore original 7-Zip behavior via tools->options->settings

7z a archiv.7z -m0=zstd -mx0   Zstandard Fastest Mode, without BCJ preprocessor
7z a archiv.7z -m0=zstd -mx1   Zstandard Fast mode, with BCJ preprocessor on executables
7z a archiv.7z -m0=zstd -mx..  ...
7z a archiv.7z -m0=zstd -mx21  Zstandard 2nd Slowest Mode, with BCJ preprocessor on executables
7z a archiv.7z -m0=zstd -mx22  Zstandard Ultra Mode, with BCJ preprocessor on executables

7z a archiv.7z -m0=lz4 -mx0   LZ4 Fastest Mode, without BCJ preprocessor
7z a archiv.7z -m0=lz4 -mx1   LZ4 Fast mode, with BCJ preprocessor on executables
7z a archiv.7z -m0=lz4 -mx..  ...
7z a archiv.7z -m0=lz4 -mx12  LZ4 Ultra Mode, with BCJ preprocessor on executables

7z a archiv.7z -m0=lz5 -mx0   LZ5 Version 1.5 Fastest Mode, without BCJ preprocessor
7z a archiv.7z -m0=lz5 -mx1   LZ5 Version 1.5 Fast mode, with BCJ preprocessor on executables
7z a archiv.7z -m0=lz5 -mx..  ...
7z a archiv.7z -m0=lz5 -mx16  LZ5 Version 1.5 Ultra Mode, with BCJ preprocessor on executables

7z a archiv.7z -m0=flzma2 -mx1   Fast LZMA2 Fastest mode, with BCJ preprocessor on executables
7z a archiv.7z -m0=flzma2 -mx..  ...
7z a archiv.7z -m0=flzma2 -mx9   Fast LZMA2 Ultra Mode, with BCJ preprocessor on executables

7z x -so test.tar.zstd | 7z l -si -ttar
-> show contents of zstd compressed tar archiv test.tar.zstd

7z x -so test.tar.lz | 7z l -si -ttar
-> show contents of lzip compressed tar archiv test.tar.lz

Zstandard codec Plugin for Mainline 7-Zip

Installation (via plugin)

1. download the Codecs.7z archiv from here 7-Zip ZS Releases, this archive holds binaries, which are compatible with the Mainline version of 7-Zip
2. create a new directory named Codecs and put in there the zstd-x32.dll or the zstd-x64.dll, depending on your 7-Zip installation
   • normally, the x32 should go to: "C:\Program Files (x86)\7-Zip\Codecs"
   • the x64 version should go in here: "C:\Program Files\7-Zip\Codecs"
3. you could also replace the 7z.dll directly within C:\Program Files (x86)\7-Zip
4. then you may check if the dll is correctly installed via this command: 7z.exe i

The output should look like this:

7-Zip 19.00 (x64) : Copyright (c) 1999-2019 Igor Pavlov : 2018-04-30

Libs:
 0  C:\Program Files\7-Zip\7z.dll

Libs:
 0  c:\Program Files\7-Zip\7z.dll
 1  c:\Program Files\7-Zip\Codecs\brotli-x64.dll
 2  c:\Program Files\7-Zip\Codecs\flzma2-x64.dll
 3  c:\Program Files\7-Zip\Codecs\lizard-x64.dll
 4  c:\Program Files\7-Zip\Codecs\lz4-x64.dll
 5  c:\Program Files\7-Zip\Codecs\lz5-x64.dll
 6  c:\Program Files\7-Zip\Codecs\zstd-x64.dll

...

Codecs:
 0 4ED  303011B BCJ2
 0  ED  3030103 BCJ
 0  ED  3030205 PPC
 0  ED  3030401 IA64
 0  ED  3030501 ARM
 0  ED  3030701 ARMT
 0  ED  3030805 SPARC
 0  ED    20302 Swap2
 0  ED    20304 Swap4
 0  ED    40202 BZip2
 0  ED        0 Copy
 0  ED    40109 Deflate64
 0  ED    40108 Deflate
 0  ED        3 Delta
 0  ED       21 LZMA2
 0  ED    30101 LZMA
 0  ED    30401 PPMD
 0   D    40301 Rar1
 0   D    40302 Rar2
 0   D    40303 Rar3
 0   D    40305 Rar5
 0  ED  6F10701 7zAES
 0  ED  6F00181 AES256CBC
 1  ED  4F71102 BROTLI
 2  ED       21 FLZMA2
 3  ED  4F71106 LIZARD
 4  ED  4F71104 LZ4
 5  ED  4F71105 LZ5
 6  ED  4F71101 ZSTD

Usage (codec plugin)

• compression and decompression for Brotli, Fast LZMA2, Lizard, LZ4, LZ5 and Zstandard within the 7-Zip container format
• you can only create .7z files, the files like .lz4, .lz5 and .zst are not covered by the plugins
• when compressing binaries (*.exe, *.dll), you have to explicitly disable the bcj2 filter via -m0=bcj, when using only the plugin dll's
• so the usage should look like this:

7z a archiv.7z -m0=bcj -m1=zstd -mx1   Fast mode, with BCJ preprocessor on executables
7z a archiv.7z -m0=bcj -m1=zstd -mx..  ...
7z a archiv.7z -m0=bcj -m1=zstd -mx21  2nd Slowest Mode, with BCJ preprocessor on executables
7z a archiv.7z -m0=bcj -m1=zstd -mx22  Ultra Mode, with BCJ preprocessor on executables
7z a archiv.7z -m0=bcj -m1=brotli -mxN  ...
7z a archiv.7z -m0=bcj -m1=lizard -mxN  ...
7z a archiv.7z -m0=bcj -m1=lz4 -mxN  ...
7z a archiv.7z -m0=bcj -m1=lz5 -mxN  ...
7z a archiv.7z -m0=bcj -m1=flzma2 -mxN  ...

Codec Plugin for Total Commander

• download TotalCmd.7z
• install it, by replacing the files tc7z.dll and tc7z64.dll with the new ones
• you can check the Total Commander Forum for more information about this DLL Files
• decompression for Brotli, Lizard, LZ4, LZ5 and Zstandard ot the 7-Zip .7z format will work out of the box with Total Commander now :-)

Codec Plugin for Far Manager

• copy the 7z.dll file from C:\Program Files\7-Zip-Zstandard\7z.dll to C:\Program Files\Far Manager\Plugins\ArcLite\7z.dll
• then restart the Far manager - and on next start, you will have support for 7-Zip Zstandard archives ;-)

Benchmarks

For the benchmarks I am using Windows 7 64bit on my Laptop which has the following Hardware:

• Intel i7-3632QM, limited to 2,2GHz, 16GB RAM, disabled swap space
• the compression benchmark is read / written to an 4 GiB ImDisk
• the decompression benchmark is also done in RAM via: 7z t archiv.7z
• the tool for measuring the times is wtime, together with some scripts
• the testfile is generated via generate-mcorpus
• please note, that the benchmarks are outdated now (new one will come, but it needs some time)

License and redistribution

• the same as the Mainline 7-Zip, which means GNU LGPL

Links

• 7-Zip Homepage
• 7-Zip Zstandard Homepage
• Request for inclusion into the mainline 7-Zip:
  • result, will currently not included :(
• p7zip Homepage - for Linux and MacOS with LZ4 and Zstandard

Donate

You find this project useful, maybe you consider a donation ;-)

Version Information

• 7-Zip ZS Version 19.00
  • Brotli Version 1.0.9
  • Fast LZMA2 Version 1.0.1
  • Lizard Version 1.0
  • LZ4 Version 1.9.3
  • LZ5 Version 1.5
  • Zstandard Version 1.4.9

/TR 2021-03-17

Notes

• if you want an code signed installer, you need to donate sth.