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libzip is an open-source library for handling zip archives. It is written in portable C and can thus be used on multiple operating systems. It is based on zlib. It is used by PHP's zip extension for zip file support [2] and MySQL Workbench. [3] It is also used by KDE's ark archiving tool for zip archive support.
The .ZIP file format was designed by Phil Katz of PKWARE and Gary Conway of Infinity Design Concepts. The format was created after Systems Enhancement Associates (SEA) filed a lawsuit against PKWARE claiming that the latter's archiving products, named PKARC, were derivatives of SEA's ARC archiving system. [3]
The Linux kernel implementation of fixed-probability decoding in rc_direct(), for performance reasons, does not include a conditional branch, but instead subtracts range from code unconditionally. The resulting sign bit is used to both decide the bit to return and to generate a mask that is combined with code and added to range .
gzip is a file format and a software application used for file compression and decompression.The program was created by Jean-loup Gailly and Mark Adler as a free software replacement for the compress program used in early Unix systems, and intended for use by GNU (from which the "g" of gzip is derived).
In popular Linux distributions, lzip can usually be installed from official package repositories. [ 5 ] [ 6 ] [ 7 ] Cygwin offers lzip as a maintained optional package (Archive category of its setup installer), and its GNU tar utility program has support for .lz archives (with --lzip option for creation).
The Linux kernel has included Zstandard since November 2017 (version 4.14) as a compression method for the btrfs and squashfs filesystems. [16] [17] [18]In 2017, Allan Jude integrated Zstandard into the FreeBSD kernel, [19] and it was subsequently integrated as a compressor option for core dumps (both user programs and kernel panics).
7-Zip: written by Igor Pavlov in C++, this version is freely licensed and achieves higher compression than zlib at the expense of CPU usage. Has an option to use the DEFLATE64 storage format. PuTTY 'sshzlib.c': a standalone implementation under the MIT License by Simon Tatham, it has full decoding capability, but only supports static tree only ...
The 7-Zip program is publicly available under the terms of the GNU Lesser General Public License. The LZMA SDK 4.62 was placed in the public domain in December 2008. The latest stable version of 7-Zip and LZMA SDK is version 24.09. [2] The 7z file format specification is distributed with 7-Zip's source code since 2015.