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===============
PPMd for python
===============
.. image:: https://readthedocs.org/projects/ppmd-cffi/badge/?version=latest
:target: https://ppmd-cffi.readthedocs.io/en/latest/?badge=latest
.. image:: https://badge.fury.io/py/ppmd-cffi.svg
:target: https://badge.fury.io/py/ppmd-cffi
.. image:: https://github.com/miurahr/ppmd/workflows/Run%20Tox%20tests/badge.svg
:target: https://github.com/miurahr/ppmd/actions
.. image:: https://coveralls.io/repos/github/miurahr/ppmd/badge.svg?branch=main
:target: https://coveralls.io/github/miurahr/ppmd?branch=main
PPM(Prediction by partial matching) is a compression algorithm which has several variations of implementations.
PPMd is the implementation by Dmitry Shkarin. It is used in the RAR and by 7-Zip as one of several possible methods.
ppmd, aka. ppmd-cffi, is a python bindings with PPMd implementation by C language.
The C codes are derived from p7zip, portable 7-zip implementation.
ppmd-cffi support PPMd ver.H and PPMd ver.I.
Development status
==================
A development status is considered as `Beta` state.
Manuals
=======
You can find a manual at the readthedocs_
.. _readthedocs: https://ppmd-cffi.readthedocs.io/en/latest/user_guide.html
Installation
============
As usual, you can install ppmd-cffi using python standard pip command.
CAUTION: Since it is a bindings with C source code, C compiler should be installed on your operating system.
.. code-block::
pip install ppmd-cffi
All C extension sources are bundled with ppmd-cffi source package, and release provides binary wheels for
Windows 64-bit, MacOS X, and Linux.
Command
=======
ppmd-cffi provide small utility compress/decompress files.
.. code-block::
$ ppmd target.txt
$ ppmd -x target.txt.ppmd
License
=======
* Copyright (C) 2020 Hiroshi Miura
* 7-Zip Copyright (C) 1999-2010 Igor Pavlov
* LZMA SDK Copyright (C) 1999-2010 Igor Pavlov
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
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