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StuffIt
StuffIt is a discontinued family of computer software utilities for archiving and compressing files. Originally produced for Macintosh, versions for Microsoft Windows, Linux (x86), and Sun Solaris were later created. The proprietary compression format used by the StuffIt utilities is also termed StuffIt. In December 2019, Smith Micro Software, the product's most-recent owner and developer, officially announced that StuffIt had reached its end-of-life and that StuffIt products would no longer be developed. One last update did come out in December 2020 after the launch of the Apple M1 architecture to support that and Intel Mac systems through a universal binary of the program. Overview StuffIt was originally developed in the summer of 1987 by Raymond Lau, who was then a student at Stuyvesant High School in New York City. It combined the fork-combining capabilities of utilities such as MacBinary with newer compression algorithms similar to those used in ZIP. Compared to exist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
StuffIt Expander
StuffIt Expander is a proprietary, freeware, closed source, decompression software utility developed by Allume Systems (a subsidiary of Smith Micro Software formerly known as Aladdin Systems). It runs on the classic Mac OS, macOS, and Microsoft Windows. Prior to 2011, a Linux version had also been available for download. The latest version for each Mac platform is as follows: * 16.2 for OS X 10.11+ (as of December 2020); * 16.0.5 for Mac OS X 10.8+; * 15.0.7 (2011) for Mac OS X 10.6, Mac OS X 10.6.8+; * 15.0.4 (2011) for Mac OS X 10.5+; * 14.0.1 (2010) for Mac OS X 10.4+; * 10.0.2 for Mac OS X 10.3+; * 8.0.2 for Mac OS X 10.0+; * 7.0.3 for Mac OS 8, Mac OS 8.6+; * 6.0.1 for Mac OS 8, Mac OS 8.1+ (PowerPC only); * 5.5.1 for Macintosh System 7, System 7.1+ (68020 and up, PowerPC); * 4.5 for System 6+ (compatible with all 68k processors). StuffIt has been a target of criticism and dissatisfaction from Mac users in the past as the file format changes frequently, notably during ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Compact Pro
Compact Pro is a software data compression utility for archiving and compressing files on the Apple Macintosh platform. It was a major competitor to StuffIt in the early 1990s, producing smaller archives in less time, able to create self-extracting archives without the use of an external program, as well as being distributed via shareware which greatly helped its popularity. A PC version was also available, ExtractorPC. Neither program is actively supported. History When it was introduced in the early 1990s, Compact Pro (originally known as "Compactor") competed against StuffIt, which had been suffering from neglect after its original developer moved on to other projects. Compact Pro sported a clean interface and a variety of new features which quickly made it a favorite among the digerati. It quickly drove StuffIt from the leadership position and became very popular on BBS systems. StuffIt 3.0 fought back with an even more powerful compression algorithm, a shareware version ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aladdin Systems
Allume Systems was a software developer, founded in 1988 by David Schargel and Jonathan Kahn in New York City as Aladdin Systems to develop, publish and distribute software for personal computers. Aladdin Systems was incorporated in January 1989. In April 2004, the company was acquired by PC software publisher International Microcomputer Software Inc. (IMSI). A few months later in July, the company was forced to change its name from Aladdin Systems as part of a settlement of a trademark lawsuit with Aladdin Knowledge Systems. In 2005, Allume Systems was acquired by Smith Micro Software from IMSI. Products As Aladdin Systems, they originally developed exclusively for Macintosh, focusing on data compression and management utilities, such as the StuffIt family of compression utilities and the ''StuffIt InstallerMaker'' delivery suite, the ''ShrinkWrap'' disk image utility, and its ''Spring Cleaning'' system optimization utility. As Aladdin Systems, the company purchased the ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DiskDoubler
DiskDoubler (DD) is a data compression utility for compressing files on the classic Mac OS platform. Unlike most such programs, which compress numerous files into a single archive for transmission, DiskDoubler compresses single files "in place" to save space on the drive. When a compressed file is opened, DiskDoubler decompresses the file before handing it off to the application for use. A later addition, AutoDoubler, adds background compression, finding and compressing files automatically when the computer is idle. DiskDoubler was created by Terry Morse and Lloyd Chambers, fellow employees at a small software firm that went out of business in 1989. Chambers had already released a version of the Unix Compress utility on the Mac as MacCompress. While working on another "real" project, Chambers wrote DiskDoubler in his spare time. When demonstrating their new product at a local Mac store, they noticed that it was DiskDoubler that got all of the attention. It was first shown publicl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PackIt
PackIt is a software data compression utility for archiving and compressing files on the Apple Macintosh platform. It was the first such program to see widespread use on the Mac, and most Mac software archives accepted uploads only in PackIt format for some time. StuffIt, introduced in the summer of 1987, offered much improved compression, and PackIt quickly disappeared. PackIt was written by Harry Chesley to support an online magazine he was writing for at the time, ''MacDeveloper''. To distribute code and sample applications, he needed to archive a number of files into one for transmission. In the original version this was done in a simple manner, simply placing the Finder file information, data fork and resource fork, if present, in a single stream and placing the resulting "block" in the archive. No compression was used, the program was purely an archiver, similar to the Unix tar utility in concept. Like tar, the format did not include an archive header of any sort. To extract ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ZIP (file Format)
ZIP is an archive file format that supports lossless compression, lossless data compression. A ZIP file may contain one or more files or directories that may have been compressed. The ZIP file format permits a number of Data compression, compression algorithms, though DEFLATE is the most common. This format was originally created in 1989 and was first implemented in PKWARE, Inc.'s PKZIP utility, as a replacement for the previous ARC (file format), ARC compression format by Thom Henderson. The ZIP format was then quickly supported by many software utilities other than PKZIP. Microsoft has included built-in ZIP support (under the name "compressed folders") in versions of Microsoft Windows since 1998 via the "Plus! 98" addon for Windows 98. Native support was added as of the year 2000 in Windows ME. Apple has included built-in ZIP support in macOS, Mac OS X 10.3 (via BOMArchiveHelper, now Archive Utility) and later. Most :Free software operating systems, free operating s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Smith Micro Software
Smith Micro Software, Inc., founded in 1982 by William W. Smith, Jr., is a developer and marketer of both enterprise and consumer-level software and services. Headquartered in Pittsburgh, Pennsylvania, Smith Micro maintains multiple domestic and international offices. United States locations include Aliso Viejo, California, and Pittsburgh, Pennsylvania. International offices are located throughout Europe and Asia. Currently, the company focuses on digital lifestyle solutions and security technologies, and is integrated into the evolving wireless media industry, as indicated by partnerships with cellular service providers such as Verizon Wireless, AT&T, and Sprint Corporation, now owned by T-Mobile US after the Sprint & T-Mobile merger in April 2020. Corporate history Smith Micro's initial focus was on dial-up modem and fax software technology, distributing predominantly to OEM computer software/hardware manufacturers. Smith Micro established an IPO in 1995, and became publicly ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
JPEG
JPEG ( , short for Joint Photographic Experts Group and sometimes retroactively referred to as JPEG 1) is a commonly used method of lossy compression for digital images, particularly for those images produced by digital photography. The degree of compression can be adjusted, allowing a selectable trade off between storage size and image quality. JPEG typically achieves 10:1 compression with noticeable, but widely agreed to be acceptable perceptible loss in image quality. Since its introduction in 1992, JPEG has been the most widely used image compression standard in the world, and the most widely used digital image format, with several billion JPEG images produced every day as of 2015. The Joint Photographic Experts Group created the standard in 1992, based on the discrete cosine transform (DCT) algorithm. JPEG was largely responsible for the proliferation of digital images and digital photos across the Internet and later social media. JPEG compression is used in a number of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Burrows–Wheeler Transform
The Burrows–Wheeler transform (BWT) rearranges a character string into runs of similar characters, in a manner that can be reversed to recover the original string. Since compression techniques such as move-to-front transform and run-length encoding are more effective when such runs are present, the BWT can be used as a preparatory step to improve the efficiency of a compression algorithm, and is used this way in software such as bzip2. The algorithm can be implemented efficiently using a suffix array thus reaching linear time complexity. It was invented by David Wheeler in 1983, and later published by him and Michael Burrows in 1994. Their paper included a compression algorithm, called the Block-sorting Lossless Data Compression Algorithm or BSLDCA, that compresses data by using the BWT followed by move-to-front coding and Huffman coding or arithmetic coding. Description The transform is done by constructing a matrix (known as the Burrows-Wheeler Matrix) whose rows are the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PPM Compression Algorithm
Prediction by partial matching (PPM) is an adaptive statistical data compression technique based on context modeling and prediction. PPM models use a set of previous symbols in the uncompressed symbol stream to predict the next symbol in the stream. PPM algorithms can also be used to cluster data into predicted groupings in cluster analysis. Theory Predictions are usually reduced to symbol rankings. Each symbol (a letter, bit or any other amount of data) is ranked before it is compressed, and the ranking system determines the corresponding codeword (and therefore the compression rate). In many compression algorithms, the ranking is equivalent to probability mass function estimation. Given the previous letters (or given a context), each symbol is assigned with a probability. For instance, in arithmetic coding the symbols are ranked by their probabilities to appear after previous symbols, and the whole sequence is compressed into a single fraction that is computed according to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archive File Format
In computing, an archive file stores the content of one or more files, possibly compressed, with associated metadata such as file name, directory structure, error detection and correction information, commentary, compressed data archives, storage, and sometimes encryption. An archive file is often used to facilitate portability, distribution and backup, and to reduce storage use. Applications Portability As an archive file stores file system information, including file content and metadata, it can be leveraged for file system content portability across heterogeneous systems. For example, a directory tree can be sent via email, files with unsupported names on the target system can be renamed during extraction, timestamps can be retained rather than lost during data transmission. Also, transfer of a single archive file may be faster than processing multiple files due to per-file overhead, and even faster if compressed. Software distribution Beyond archiving, archive fi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tar (file Format)
In computing, tar is a shell command for combining multiple computer files into a single archive file. It was originally developed for magnetic tape storage reading and writing data for a sequential I/O device with no file system, and the name is short for the format description "tape archive". When stored in a file system, a file that tar reads and writes is often called a ''tarball''. A tarball contains metadata for the contained files including the name, ownership, timestamps, permissions and directory organization. As a file containing other files with associated metadata, a tarball is useful for software distribution and backup. POSIX abandoned ''tar'' in favor of '' pax'', yet ''tar'' continues to have widespread use. History The command was introduced to Unix in January 1979, replacing the tp program (which in turn replaced "tap"). The file structure was standardized in POSIX.1-1988 and later POSIX.1-2001, and became a format supported by most modern file arc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
