| Developer(s) | Info-ZIP |
|---|---|
| Initial release | August 1992 |
| Stable release | 3.00 / 7 July 2008 |
| Preview release | 3.1c / 29 June 2010 |
| Development status | Active |
| Written in | C |
| Platform | widely cross-platform |
| Type | File archiver |
| License | BSD-like license |
| Website | www.info-zip.org/Zip.html |
| Original author(s) | Samuel H. Smith[1] |
|---|---|
| Developer(s) | Info-ZIP |
| Initial release | 3 March 1989 |
| Stable release | 6.0 / 29 April 2009 |
| Preview release | 6.10b / 10 December 2010 |
| Development status | Active |
| Written in | C |
| Platform | widely cross-platform |
| Type | File archiver |
| License | BSD-like license |
| Website | www.info-zip.org/UnZip.html |
| Developer(s) | Mike White |
|---|---|
| Stable release | 5.03 / 11 March 2005 |
| Written in | C |
| Operating system | Windows 3.1 and later |
| Platform | Intel x86 - 32-bit; Alpha AXP (Windows NT series only) |
| Type | File archiver |
| License | BSD-like license |
| Website | www.info-zip.org/WiZ.html |
| Developer(s) | Dirk Haase |
|---|---|
| Stable release | 1.06 / 22 February 2001 |
| Development status | Unmaintained[2] |
| Written in | C |
| Operating system | Mac OS Classic 7 or later |
| Platform | Motorola 68020 or later; PowerPC |
| Type | File archiver |
| License | BSD-like license |
| Website | www.haase-online.de/dirk/maczip/ |
Info-ZIP is a set of open-source software to handle ZIP archives. It has been in circulation since 1989. It consists of 4 separately-installable packages: the Zip and UnZip command-line utilities; and WiZ and MacZip, which are graphical user interfaces for archiving programs in Microsoft Windows and classic MacOS, respectively.
Info-ZIP's Zip and UnZip have been ported to dozens of computing platforms. The UnZip web page describes UnZip as "The Third Most Portable Program in the World", surpassed by Hello World, C-Kermit, and possibly the Linux kernel.[3] The "zip" and "unzip" programs included with most Linux and Unix distributions are Info-ZIP's Zip and UnZip.
In addition to the Info-ZIP releases themselves, parts of Info-ZIP, including zlib, have been used in numerous other file archivers and other programs.[1] Many Info-ZIP programmers have also been involved in other projects closely related to the DEFLATE compression algorithm, such as the PNG image format and the zlib software library.[4]
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The UnZip package also includes three additional utilities:
The Zip package includes three additional utilities:
The first version of UnZip was released by Samuel M. Smith in March 1989, with Pascal and C versions. Pascal was abandoned soon after. Smith's UnZip 2.0, in September, included support for the "unimploding" (method 6) as in PKZIP 1.01. Carl Mascott and John Cowan released UnZip 2.0a in December.[4]
In Spring 1990, Info-ZIP was formed as a mailing list on SIMTEL20, and released UnZip 3.0. In December, UnZip 4.0, with ZIP file "central directory" support, was released.[4]
UnZip 5.0 and Zip 1.9 were released in August 1992; these are the first Info-ZIP programs to support the new DEFLATE (method 8) compression method used in PKZIP 1.93a.[4] Method 8 has become the de facto base standard for ZIP archives.
In 1994 and 1995 Info-ZIP turned a corner, and effectively became the de facto ZIP program on non-MS-DOS systems. A huge number of ports were released that year, including numerous minicomputers, mainframes and practically every microcomputer ever developed.
WiZ 4.0 was released in November 1997.[4]
The first times Info-ZIP released versions under the new BSD-like Info-ZIP License were Zip 2.3 in December 1999 and UnZip 5.41 and WiZ 5.01 in April 2000.[4]
The first MacZip (1.05) was released in July 2000; the last version was 1.06, released in February 2001. It was written by Dick Hasse.[4]
General Deflate64 (method 9) decompression was introduced with UnZip 5.50, whose main release was in February 2002.[5]
UnZip 6.0 includes "Zip64" large file support and bzip2-method (method 12) decompression.[6] Support for bzip2-style compression was also in Zip from 3.0f beta.[7]
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