7-zip plugins

[maadjordan]

This is a main thread for all 7-zip addons and plugins

7-Zip-FL2: https://github.com/conor42/7-Zip-FL2
7-Zip using the Fast LZMA2 library

Asar7z: http://www.tc4shell.com/en/7zip/asar/

This plugin allows you to open, create, or modify ASAR archives (used for packaging applications based on the Electron framework).

eDecoder: http://www.tc4shell.com/en/7zip/edecoder/

This plugin allows you to open following email files and MHTML files in 7-Zip:

MGS – a format used by Microsoft Outlook
TNEF – a format used by Microsoft Outlook (the winmail.dat or ATT0001.dat file)
DBX – the format used by Outlook Express 5 and 6
MBX – the format used by Outlook Express 4
MBOX – a format used by many email clients
TBB – the format used by The Bat!
PMM – the format used by Pegasus Mail
EMLX – the format used by Mail (Apple’s email client)
EML, NWS, MHT, MHTML, and B64
UUE and XXE
NTX – YEnc files
BIN – MacBinary files
HQX – BinHex files
WARC – Web ARChive files

It also can create B64, XXE, UUE, NTX, BIN, and HQX files.

The plugin also contains eSplitter. It's a special codec that helps 7-Zip pack text files containing binary data encoded using base64.

ExFat7z http://www.tc4shell.com/en/7zip/exfat7z/
open ExFat disk images and extract files from.

fast-lzma2: https://github.com/conor42/fast-lzma2
adds Fast LZMA2 math finder to 7-zip.


Forensic7z: http://www.tc4shell.com/en/7zip/forensic7z/

This plugin allows you to open and browse the following disk images created by specialized software for forensic analysis:

ASR Expert Witness Compression Format (.S01)
Encase Image File Format (.E01, .Ex01)
Encase Logical Image File Format (.L01, .Lx01)
Advanced Forensics Format (.AFF)
AccessData FTK Imager Logical Image (.AD1)

Grit7z: http://www.tc4shell.com/en/7zip/grit7z/

This plugin allows you to open, create, or modify PAK archives (used in Chrome or Chromium-based browsers):

Iso7z:http://www.tc4shell.com/en/7zip/iso7z/

This plugin allows you to open the following additional disc images formats in 7-Zip:

CCD/IMG - disc images created with CloneCD
CDI - disc images created with DiscJuggler
CHD (v4) - images used by MAME
CSO
CUE/BIN
ECM - disc images compressed with ECM Tool
GDI - Dreamcast Gigabyte disc images
ISZ - disc images created with UltraISO
MDS/MDF - disc images created with Alcohol 120%
NRG - disc images created with Nero Burning ROM
Zisofs compressed files

The plugin also contains a special codec RawSplitter that enables 7-Zip to efficiently pack uncompressed raw disc images (CCD/IMG, CDI, CUE/BIN, GDI, MDS/MDF, or NRG) into 7z archives

Lzip7z: http://www.tc4shell.com/en/7zip/lzip/

This plugin allows you to open, create, or modify LZIP archives (used on Unix-like systems based on http://www.nongnu.org/lzip/lzip.html).

Modern7z:http://www.tc4shell.com/en/7zip/modern7z/

This plugin allows you to use the following additional compression methods in 7-Zip:

Zstandard v1.4.2
Brotli v1.0.4
LZ4 v1.9.1
LZ5 v1.5
Lizard v1.0
Fast LZMA2 v0.9.2

7-zip Zstd: https://github.com/mcmilk/7-Zip-zstd

Adds support to other compression methods to 7-Zip with support for Brotli, Fast-LZMA2, Lizard, LZ4, LZ5 and Zstandard.

Mfilter: http://www.tc4shell.com/en/7zip/mfilter/

Filter plugin designed to deliver higher compression ratios to certain multimedia file types by means of automatic pre-processing

Smart 7z: http://www.tc4shell.com/en/7zip/smart7z/

This plugin provides flexible settings when packing files into a .7z archive

Thumbs7z: http://www.tc4shell.com/en/7zip/thumbs7z/

This plugin allows you to open Thumbs.db and thumbcache.db files (Windows thumbnail cache files) in 7-Zip.

Wavpack7z: http://www.tc4shell.com/en/7zip/wavpack7z/

This plugin allows you to use additional compression method WavPack in 7-Zip:

.wav (including bwf/rf64 and Multiple Data Chunks (Legasy Audition Format) formats)
.caf (Core Audio Format)
.w64 (Sony Wave64)
.dff (Philips DSDIFF)
.dsf (Sony DSD stream)
.aif, .afc (Аudio Interchange File Format, including AIFF-C format)

Wincrypthashers: http://www.tc4shell.com/en/7zip/wincrypthashers/

This plugin allows you to view additional checksums in 7-Zip:
MD2
MD4
MD5
SHA-384
SHA-512

It can also create text files containing checksums.

Old Plugins:

LZMH: New compression method from Igor Pavlov https://encode.su/threads/1117-LZHAM...ll=1#post22513

LZHAM: New compression method at https://github.com/richgel999/lzham_codec_devel



Optimizers:

7-ZIP finetuner : http://krzyrio.blogspot.com/2017/01/...finetuner.html
optimize 7z to smaller size

Ultra7z Optimizer: http://www.ultra7z.ru/
Optimize and convert your 7z (rar, zip…) in smaller 7z archives!


http://www.tc4shell.com/en/7zip/

Test files:

7zmethods: https://encode.su/threads/15-7-Zip?p...ll=1#post11695

7z file with files compressed in different method in one file.


Other Developments:

Ecozip: based on 7-zip with additional compression methods https://github.com/StephanBusch/EcoZip

[maadjordan]

New Plugin Added: ExFat7z

[tansy]

Does anyone have some kind of quick manual or "doc" how to make simple plugin for (p)7zip?
tc4shell made it really well but it's all binary, if one wants to made their own there is lack of any kind of info about that, even on 7zip page/discussion. Author doesn't bother either.

[Shelwien]

If you can build 7-zip itself, it shouldn't be a problem to build a plugin, since they're all in separately compiled modules.
You can just use existing ones as example, eg. see
https://github.com/kornelski/7z/blob...ndler.cpp#L470 (a whole new archive format)
https://github.com/kornelski/7z/blob...mdRegister.cpp (a codec for .7z)
Basically compile it with DllExports.cpp and put into Codecs subdir.

[tansy]

I understand now. Will check it. Thanks.
​
ed: do you mean $p7zip/CPP/Archive/DllExports2.cpp ? And what will be different in linux (p7zip)?

[Shelwien]

p7zip even has an example, a standalone dynamic library for rar format:
https://github.com/tehmul/p7zip-zstd.../makefile.list

> do you mean $p7zip/CPP/Archive/DllExports2.cpp ?

Here's an example for windows: https://github.com/conor42/7-Zip-FL2...lzma2/makefile

[tansy]

Thanks for those links, they were invaluable.

I found that unlike main/official 7zip release mcmilk-7zip-zstd do have few codecs made as plugins which is really cool but still don't understand it. I analyzed codecs source and my discoveries are like that: Codec.def provides symbols* that are to be exported in .so/.dll but I checked all released codecs sources** and they are not defined anywhere*** which perplexes me.

So first what is the meaning of these methods*? Is that all symbols I need to provide for export to make it work and how do I change existing archive codec, for example `$_7ZIP_SRC/CPP/7zip/Archive/`LzHandler.cpp or .../Bzip2Handler.cpp, whatever? The simpler the better.

I just noticed, that for lizard, for example, there is either plugin and archive codec definitions****. Is that redundancy or is it really a dynamic plugin or it is embedded archive codec?


------------------------------------

* Codec.def: CreateDecoder, CreateEncoder, CreateObject, GetMethodProperty, GetNumberOfMethods

** brotli, flzma, lizard, zstd

*** `$ find $_7ZIP_SRC -iname lizard\* -exec grep CreateEncoder {} ";"`
gives nothing

**** archive codecs are wired/embedded into 7zip and cannot be dynamically added/removed
their exports are defined in `$_7ZIP_SRC/CPP/7zip/Archive/`Archive.def or .../Archive2.def.

[Shelwien]

> I analyzed codecs source and my discoveries are like that: Codec.def provides symbols*
> that are to be exported in .so/.dll but I checked all released codecs sources** and
> they are not defined anywhere*** which perplexes me.

Exported symbols are always only in *Export*.cpp

7-zip plugin system works like this:
1) There're macros (REGISTER_CODEC_E etc), which define global tables as codec/format descriptors.
These tables are defined with some global function calls for init.
So they can be defined in different independently-compiled object modules,
but a single function would be called as "initializer" to enumerate them.
2) There's always the same COM-like interface.
3) Overall framework design and APIs are similar to https://en.wikipedia.org/wiki/DirectShow#Architecture

> So first what is the meaning of these methods*?

It doesn't really matter for you.
Just take some simple codec (eg. CopyCoder.cpp) and modify the Code() method
to do something different.
Also, in theory, each codec is supposed to have an unique name and binary id,
these are shown by "7z i":

REGISTER_FILTER_E(BCJ, CCoder(false), CCoder(true), 0x3030103, "BCJ" )

> I just noticed, that for lizard, for example, there is either plugin and archive codec definitions****.
> Is that redundancy or is it really a dynamic plugin or it is embedded archive codec?

Standard 7-zip does the same for .pmd and .lzma formats.
Codec objects in 7-zip are basically extra codecs for 7-zip format,
while format objects (defined with REGISTER_ARC_I) don't necessarily have
to export their codecs for .7z use (and its more efficient to use codecs directly
rather than with 7z's GUID-based COM API).

> *** `$ find $_7ZIP_SRC -iname lizard\* -exec grep CreateEncoder {} ";"`
> gives nothing

Its defined in CodecExports.cpp

> **** archive codecs are wired/embedded into 7zip and cannot be dynamically added/removed
> their exports are defined in `$_7ZIP_SRC/CPP/7zip/Archive/`Archive.def or .../Archive2.def.

Not really. Just not add an .obj with format or codec descriptor table and
7-zip won't support this format or codec.