compress files from micropython

[lixas]

Hello
I've build web server on ESP32 microcontroller and would like to add availability to make backups of particular files.
What are my options to compress files from micropython??

So far I'm just able to find decompression functionality, but not compression...

[dlech]

#5590

[bixb922]

Seems to be technically challenging, there is very interesting and recent talk about this topic: https://m.youtube.com/watch?v=Msfn0Qn_AgI

[bixb922]

Have you looked at this?
https://rosettacode.org/wiki/LZW_compression#Python Might work for small files, or if you have enough RAM, the dictionary during compression may well need 10 or more times the size of the file.

If the files are data, probably your best option is to write binary files with the smallest or most compact data type available for each data type.

[jimmo]

There is WIP support for adding zlib/gzip compression (to match the existing decompression support), hopefully this will be finished after 1.20 is released.

[jonnor]

There is now pretty good support for deflate/zlib style compression, including streaming. See the deflate module, https://docs.micropython.org/en/latest/library/deflate.html#deflate.DeflateIO

If one wants to use ZIP archive files, there is https://github.com/jonnor/micropython-zipfile