ESP32 Forum

Hey guys, I am very new to the ESP32 environment, so bear with me. I am wanting to compress/decompress a file in the ESP32, and I saw that a library called miniz is included in the idf. But I am honestly completely clueless on how to use this library, as there isn't an example for it. If anyone can help guide me in the right direction , I would greatly appreciate it. Thank you for your time!

There is an example on the IDF :

https://github.com/espressif/esp-idf/bl ... st_miniz.c

Now keep in mind that #include "esp32/rom/miniz.h" includes only the low level deflate / inflate methods.
I'm sending compressed data (led matrix video) from an Android app and I found Brotli to be a very reliable decompressor for ESP32. Check google's library with my fork to update headers and tests for ESP32 here:

https://github.com/martinberlin/brotli

I've managed to get miniz working in my project by inluding both .c and .h
Only problem is I don't have enough ram to run compress function.

Is there any plan to include a compression lib in esp-idf that will work out of the box without tweeking? (I think a lot of people will appreciate that)

We are running an IoT startup and need to send log data etc to AWS IOT. Would help a lot if we could compress log files before transfer.

I don't think lack of ram is a problem that is easily solvable... due to the nature of zlib-style compression, the compressor needs to keep large chunks of data in RAM to compare incoming data with, to see if it can be replaced by a backreference.

I see. Though there seems to be a lot of people that got it running....

Anyone who know about other compression lib that is more lightweight?

>Anyone who know about other compression lib that is more lightweight?

zlib is more lightweight.

Works with ESP32C2 with small RAM.

https://github.com/nopnop2002/esp-idf-zlib

https://github.com/atomicobject/heatshrink claims to work with memory footprints of 50 bytes. I'm not sure how it compares in terms of compression size, but it's on my to-evaluate list.

DrMickeyLauer wrote: ↑

Tue Jan 23, 2024 2:17 pm

https://github.com/atomicobject/heatshrink claims to work with memory footprints of 50 bytes. I'm not sure how it compares in terms of compression size, but it's on my to-evaluate list.

I used that a long time ago. It's pretty decent, albeit not as efficient as zlib.