Support "Split to Volumes" 7zip feature about py7zr HOT 11 CLOSED

It is good chance for contributor to add command line option and add function described above in py7zr/cli.py.
For creation,

1. create archive.7z as ordinal but on temporary directory.
2. split archive into a several files with a specified size.

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I don't know a specification for multi volume archives.
Does anyone knows a specification or reference?

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This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 5 days

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Maybe should you deactivate github-actions (bot) as:

• I won't comment every week
• it closes useful issue (eg #88 #89)

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7zip seems not to finish a implementation of 7z-Multivolue because original source said

// #define _7Z_VOL
// 7z-MultiVolume is not finished yet.
// It can work already, but I still do not like some
// things of that new multivolume format.
// So please keep it commented.

https://github.com/kornelski/7z/blob/20e38032e62bd6bb3a176d51bce0558b16dd51e2/CPP/7zip/Archive/7z/7zHeader.h#L14-L19

Are there any further specification information?

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@Kcchouette If you want to extract files such as data.7z.001 data.7z.002 data.7z.003, you can do it without py7zr modification as follows;

cat data.7z.001 data.7z.002 data.7z.003 > data.7z
py7zr x data.7z

You can also create sliced archives

split -a 3 -b 10k data.7z

You can find files data.7z.001 data.7z.002 data.7z.003

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It is also easy to write python script do the same thing

import os
import pathlib
import py7zr

archive = 'data.7z'
with open(archive, 'wb) as outf:
    for i in range(100):
        src = pathlib.Path("{:s}{:03d}".format(archive, i))
        if not src.exist():
           break
        outf.write(src.read_bytes())

with py7zr.SevenZipFile(archive, 'r') as zip:
    zip.extractall()

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#134 is super simple implementation. Does it help @Kcchouette ?

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v0.7.2 with the feature as CLI is now released.

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Thanks, it's exactly what I wanted
Maybe should you document that? https://py7zr.readthedocs.io/en/latest/py7zr.html#command-line-options

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Document updated. I'd like to close.

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