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=======================================
BCJ(Branch-Call-Jump) filter for python
=======================================
.. image:: https://badge.fury.io/py/pybcj.svg
:target: https://badge.fury.io/py/pybcj
.. image:: https://img.shields.io/conda/vn/conda-forge/pybcj
:target: https://anaconda.org/conda-forge/pybcj
.. image:: https://coveralls.io/repos/github/miurahr/pybcj/badge.svg?branch=main
:target: https://coveralls.io/github/miurahr/pybcj?branch=main
In data compression, BCJ, short for Branch-Call-Jump, refers to a technique that improves the compression of
machine code of executable binaries by replacing relative branch addresses with absolute ones.
This allows a LZMA compressor to identify duplicate targets and archive higher compression rate.
BCJ is used in 7-zip compression utility as default filter for executable binaries.
pybcj is a python bindings with BCJ implementation by C language.
The C codes are derived from p7zip, portable 7-zip implementation.
pybcj support Intel/Amd x86/x86_64, Arm/Arm64, ArmThumb, Sparc, PPC, and IA64.
Development status
==================
A development status is considered as ``Beta`` state.
Installation
============
As usual, you can install pybcj using python standard pip command.
.. code-block::
pip install pybcj
Alternatively, one can also use conda:
.. code-block::
conda install -c conda-forge pybcj
WARNING
-------
* When use it on MSYS2/Mingw64 environment, please set environment variable
`SETUPTOOLS_USE_DISTUTILS=stdlib` to install.
License
=======
- SPDX-License-Identifier: LGPL-2.1-or-later
- SPDX-URL: https://spdx.org/licenses/LGPL-2.1-or-later.html
* Copyright (C) 2020-2025 Hiroshi Miura
* Copyright (C) 1999-2010 Igor Pavlov
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