loongson/pypi/: pyppmd-0.18.2 metadata and description

PPMd compression/decompression library

author	Hiroshi Miura
author_email	Hiroshi Miura <miurahr@linux.com>
classifiers	Development Status :: 4 - Beta License :: OSI Approved :: GNU Lesser General Public License v2 or later (LGPLv2+) Operating System :: MacOS :: MacOS X Operating System :: Microsoft :: Windows Operating System :: POSIX Operating System :: POSIX :: Linux Programming Language :: Python Programming Language :: Python :: 3 Programming Language :: Python :: 3.6 Programming Language :: Python :: 3.7 Programming Language :: Python :: 3.8 Programming Language :: Python :: 3.9 Programming Language :: Python :: 3.10 Programming Language :: Python :: 3 :: Only Programming Language :: Python :: Implementation :: CPython Programming Language :: Python :: Implementation :: PyPy Topic :: Software Development :: Libraries :: Python Modules
description_content_type	text/x-rst
keywords	ppmd,7-zip,compression
license	PyPPMd is distributed under GNU Lesser General Public License version 2.1 or any later version. The source code in PyPPMd is partially in the public domain, LGPLv2 and partially modified work of the software distributed under the BSD 3-Clause license. PyPPMd takes a LGPL2.1+ for license compatibility between them. You can use PyPPMd as python dependency of any software, and/or combines with LGPL2.1+, LGPL3, GPLv2, and GPLv3 software. GNU Lesser General Public License ================================= Copyright (C) 2020-2021, Hiroshi Miura 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 Public domain/GNU Lesser General Public License =============================================== C code under lib folder which originating from 7-zip are released under LGPL, and each sources are noted as follows. - 2017-04-03 : Igor Pavlov : Public domain - PPMd var.H (2001): Dmitry Shkarin : Public domain - PPMd var.I (2002): Dmitry Shkarin : Public domain - Carryless rangecoder (1999): Dmitry Subbotin : Public domain 7-zip, Copyright (C) 1999-2017, 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 can receive a copy of the GNU Lesser General Public License from http://www.gnu.org/ BSD license =========== A part of C extension code is a derived work of pyzstd which is licensed under BSD 3-Clause license. BSD 3-Clause License Copyright (c) 2016 Tino Reichard Copyright (c) 2020-2021, Ma Lin, All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
project_urls	Source, https://github.com/miurahr/pyppmd
provides_extras	test
requires_dist	mypy (>=0.812) ; extra == 'check' mypy-extensions (>=0.4.3) ; extra == 'check' check-manifest ; extra == 'check' flake8 ; extra == 'check' flake8-black ; extra == 'check' readme-renderer ; extra == 'check' pygments ; extra == 'check' isort (>=5.0.3) ; extra == 'check' sphinx (>=2.3) ; extra == 'docs' sphinx-rtd-theme ; extra == 'docs' atheris ; extra == 'fuzzer' hypothesis ; extra == 'fuzzer' pytest (>=6.0) ; extra == 'test' pytest-benchmark ; extra == 'test' pytest-cov ; extra == 'test' pytest-timeout ; extra == 'test' hypothesis ; extra == 'test' coverage[toml] (>=5.2) ; extra == 'test'
requires_python	>=3.6

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File	Tox results	History
pyppmd-0.18.2-cp37-cp37m-linux_loongarch64.whl Size 119 KB Type Python Wheel Python 3.7		Uploaded to loongson/pypi by loongson 2022-07-22 10:23:52

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Introduction

pyppmd module provides classes and functions for compressing and decompressing text data, using PPM(Prediction by partial matching) compression algorithm which has several variations of implementations. PPMd is the implementation by Dmitry Shkarin. PyPPMD use Igor Pavlov’s range coder introduced in 7-zip.

The API is similar to Python’s bz2/lzma/zlib module.

Some parts of th codes are derived from 7-zip, pyzstd and ppmd-cffi.

Development status

A development status is considered as Beta.

Extra input byte

PPMd algorithm and implementation is designed to use Extra input byte. The encoder will omit a last null (b”0”) byte when last byte is b”0”. You may need to provide an extra null byte when you don’t get expected size of extracted data.

You can do like as:

dec = pyppmd.Ppmd7Decoder(max_order=6, mem_size=16 << 10)
result = dec.decode(compressed, length)
if len(result) < length:
    if dec.needs_input:
        # ppmd need an extra null byte
        result += dec.decode(b"\0", length - len(result))
    else:
        result += dec.decode(b"", length - len(result))

WARNING

When use it on MSYS2/MINGW64 environment, you should set environment variable SETUPTOOLS_USE_DISTUTILS=stdlib

Copyright and License

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