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micropython-zipfile

Support for .zip files for MicroPython. Port of CPython zipfile.

A subset of .zip was standardized in ISO/IEC 21320–1:2015 "Document Container File: Core". Such files should work with this module. ZIP archives are used as a basis for many common files, such as EPUB, DOCX

micropython-zipfile was initially made for micropython-npyfile, to support Numpy .npz files (uses a ZIP archive). Which again was made for emlearn-micropython, a Machine Learning and Digital Signal Processing library for MicroPython.

Status

Minimally useful.

• Supports read/write of ZIP archives, with or without compression
• Highly compatible with the CPython API
• Passes over 100 tests from the CPython test suite
• Tested on the Unix port and ESP32 port, running MicroPython 1.23

License

The majority of the code is copied from the CPython 3.12 implementation of zipfile. That code is, to the best of our understanding, under the PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2. All modifications/adaptations done in this project can be used under the same license.

Features

This is an adapted implementation of the original zipfile module in CPython. With the exception of the Limitations documented below, it should have the same features.

Prerequisites

This library uses the MicroPython deflate module to handle compression and decompression. Therefore your MicroPython firmware build must include this module, which may require you to enable the MICROPY_PY_DEFLATE and MICROPY_PY_DEFLATE_COMPRESS features.

If you get the error AttributeError: 'DeflateIO' object has no attribute 'write', you are missing MICROPY_PY_DEFLATE_COMPRESS.

Limitations

These limitations could be lifted if people contribute

• Only DEFLATE and STORED (uncompressed) is supported.
• LZMA compression not supported
• BZ2 compression not supported
• PathLike objects not supported.
• readline() and readlines() on file objects not supported

These limitations are likely to be forever. This is because they are not that relevant in a microcontroller/embedded setting.

• PyFile objects not supported
• Usage as a command-line module not supported
• append mode ('a' option to ZipFile) not supported.
• exclusive mode ('x' option to ZipFile) not supported.
• Only ascii and utf-8 supported for metadata encoding

Installing

This package can be installed using mip.

For example:

mpremote mip install github:jonnor/micropython-zipfile

Or just copy the zipfile.py file to your MicroPython device.

Usage

Create a ZIP archive

# Import the module
from zipfile import ZipFile, ZIP_DEFLATED, ZIP_STORED

# Create a .zip archive
# for compression, swap ZIP_STORED with ZIP_DEFLATED
path = 'myarchive.zip'
with ZipFile(path, 'w', ZIP_STORED) as archive: 
    contents = b'Hello World Hello World Hello World\n'
    with archive.open('test.txt', 'w') as f:
        f.write(contents)

List what is inside a ZIP archive

# List the information from a .zip archive
print('\nListing information')
with ZipFile(path, 'r') as archive: 
    for info in archive.infolist(): 
        print(info.filename)
        print('\tSystem:\t\t' + str(info.create_system) + '(0 = Windows, 3 = Unix)') 
        print('\tZIP version:\t' + str(info.create_version)) 
        print('\tCompressed:\t' + str(info.compress_size) + ' bytes') 
        print('\tUncompressed:\t' + str(info.file_size) + ' bytes') 

Read data from a file inside ZIP archive

# Read a file from inside .zip archive
print('\nReading file')
with ZipFile(path) as myzip:
    with myzip.open('test.txt') as myfile:
        print(myfile.read())

More

Also see examples. And consult tutorials and the API reference for the CPython zipfile module.

TODO

Contributions welcomed!

Other implementations

• maruno/mpy-blox zipfile.py. Minimal implementation of zipfile.ZipFile which supports only ureading. The function read() supports uncompressed or deflate compressed data. Not clear if ZIP64 is supported. Not separately installable.

Developing

Running tests on host

Install the Unix/Windows port of MicroPython.

Install modules used by the tests

micropython -m mip install contextlib unittest os-path stat shutil

Run the basic test suite:

MICROPYPATH=.:$HOME/.micropython/lib micropython tests/test_zipfile.py

Run the full test suite with MicroPython:

MICROPYPATH=.:$HOME/.micropython/lib micropython -X heapsize=10M test_zipfile/test_core.py

The tests can also be ran under CPython

PYTHONPATH=./ python test_zipfile/test_core.py  -v
MICROPYPATH=.:$HOME/.micropython/lib micropython tests/test_zipfile.py

Running tests on device

Connect a MicroPython device via USB.

Copy over the data

mpremote cp zipfile.py :
mpremote run tests/test_zipfile.py