===============
PPMd for python
===============

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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-cffi is a python bindings with PPMd implementation by C language.
The C codes are derived from p7zip, portable 7-zip implementation.
ppmd-cffi supports PPMd var.H and PPMd var.I.


PyPPMd_ is a brother project that use python buffer protocol for interface.
It supports PPMd var.H, and PPMd var. I on posix platforms(mac and linux).
It supports CPython and PyPy. 

.. _PyPPMd: https://pypi.org/project/pyppmd/

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.

.. code-block::

    pip install ppmd-cffi


Command
=======

ppmd-cffi provide small utility compress/decompress files.

.. code-block::

    $ ppmd target.txt
    $ ppmd -x target.txt.ppmd


License
=======

* Copyright (C) 2020,2021 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
