Development Status
- 5 - Production/Stable
License
- OSI Approved :: GNU Lesser General Public License v2 or later (LGPLv2+)
Operating System
- MacOS :: MacOS X
- Microsoft :: Windows
- POSIX
- POSIX :: Linux
Programming Language
- Python
- Python :: 3
- Python :: 3.9
- Python :: 3.10
- Python :: 3.11
- Python :: 3.12
- Python :: 3.13
- Python :: 3 :: Only
- Python :: Implementation :: CPython
- Python :: Implementation :: PyPy
Topic
- Software Development :: Libraries :: Python Modules
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.
pip install pybcjAlternatively, one can also use conda:
conda install -c conda-forge pybcjWARNING
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
Copyright (C) 2020-2025 Hiroshi Miura
Copyright (C) 1999-2010 Igor Pavlov
