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Project Description

Overview

This is an LZ4-frame compression library for Python v3.2+ (and 2.7+), bound to Yann Collet’s LZ4 C implementation.

Installing / packaging

# To get from PyPI
pip3 install py-lz4framed

# To only build extension modules inline (e.g. in repository)
python3 setup.py build_ext -i

# To build & install globally
python3 setup.py install

Notes

Usage

Single-function operation:

import lz4framed

compressed = lz4framed.compress(b'binary data')

uncompressed = lz4framed.decompress(compressed)

To iteratively compress (to a file or e.g. BytesIO instance):

with open('myFile', 'wb') as f:
    # Context automatically finalises frame on completion, unless an exception occurs
    with Compressor(f) as c:
        try:
            while (...):
               c.update(moreData)
        except Lz4FramedNoDataError:
            pass

To decompress from a file-like object:

with open('myFile', 'rb') as f:
    try:
        for chunk in Decompressor(f):
           decoded.append(chunk)
    except Lz4FramedNoDataError:
        # Compress frame data incomplete - error case
        ...

See also lz4framed/__main__.py for example usage.

Documentation

import lz4framed
print(lz4framed.__version__, lz4framed.LZ4_VERSION, lz4framed.LZ4F_VERSION)
help(lz4framed)

Command-line utility

python3 -mlz4framed
USAGE: lz4framed (compress|decompress) (INFILE|-) [OUTFILE]

(De)compresses an lz4 frame. Input is read from INFILE unless set to '-', in
which case stdin is used. If OUTFILE is not specified, output goes to stdout.

Tests

Static

This library has been checked using flake8 and pylint, using a modified configuration - see pylint.rc and flake8.cfg.

Unit

python3 -m unittest discover -v .

Why?

The only existing lz4-frame interoperable implementation I was aware of at the time of writing (lz4tools) had the following limitations:

  • Incomplete implementation in terms of e.g. reference & memory leaks on failure
  • Lack of unit tests
  • Not thread safe
  • Does not release GIL during low level (de)compression operations
  • Did not address the requirements for an external project
Release History

Release History

0.9.3

This version

History Node

TODO: Figure out how to actually get changelog content.

Changelog content for this version goes here.

Donec et mollis dolor. Praesent et diam eget libero egestas mattis sit amet vitae augue. Nam tincidunt congue enim, ut porta lorem lacinia consectetur. Donec ut libero sed arcu vehicula ultricies a non tortor. Lorem ipsum dolor sit amet, consectetur adipiscing elit.

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0.9.2

History Node

TODO: Figure out how to actually get changelog content.

Changelog content for this version goes here.

Donec et mollis dolor. Praesent et diam eget libero egestas mattis sit amet vitae augue. Nam tincidunt congue enim, ut porta lorem lacinia consectetur. Donec ut libero sed arcu vehicula ultricies a non tortor. Lorem ipsum dolor sit amet, consectetur adipiscing elit.

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Download Files

Download Files

TODO: Brief introduction on what you do with files - including link to relevant help section.

File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
py-lz4framed-0.9.3.tar.gz (71.9 kB) Copy SHA256 Checksum SHA256 Source Jul 18, 2016

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