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(The tar program in its own does not compress; it just stores multiple files within one tape archive.) Files can be returned to their original state using uncompress. The usual action of uncompress is not merely to create an uncompressed copy of the file, but also to restore the timestamp and other attributes of the compressed file. For files ...
AppleFSCompression.framework (AFSC), the mechanism for quasi-transparent compression in HFS Plus and Apple File System, supports LZFSE and LZVN since OS X 10.9.. Apple's Disk Images framework has offered an LZFSE-based encoding called ULFO since Mac OS X 10.11, [9] accessible via hdiutil(1) [10] and some third-party image utilities.
RPM files consist of metadata concatenated with (usually) a cpio archive. Newer RPM systems also support other archives, as cpio is becoming obsolete. cpio is also used with initramfs. .shar application/x-shar Shell archive: Unix-like A self-extracting archive that uses the Bourne shell (sh). .LBR .LBR: CP/M DOS A system for storing multiple files.
BTLZ is an LZ78-based algorithm that was developed for use in real-time communications systems (originally modems) and standardized by CCITT/ITU as V.42bis. When the trie-structured dictionary is full, a simple re-use/recovery algorithm is used to ensure that the dictionary can keep adapting to changing data. A counter cycles through the ...
An Explanation of the Deflate Algorithm – by Antaeus Feldspar; Extended Application of Suffix Trees to Data Compression Archived 2016-09-23 at the Wayback Machine – an excellent algorithm to implement Deflate by Jesper Larsson; Zip Files: History, Explanation and Implementation – walk-through of a Deflate implementation
ZIP files generally use the file extensions.zip or .ZIP and the MIME media type application/zip. [1] ZIP is used as a base file format by many programs, usually under a different name. When navigating a file system via a user interface, graphical icons representing ZIP files often appear as a document or other object prominently featuring a ...
The 7-Zip implementation uses several variants of hash chains, binary trees and Patricia trees as the basis for its dictionary search algorithm. In addition to LZMA, the SDK and 7-Zip also implements multiple preprocessing filters intended to improve compression, ranging from simple delta encoding (for images) and BCJ for executable code. It ...
XZ Utils can compress and decompress the xz and lzma file formats. Since the LZMA format has been considered legacy, [2] XZ Utils by default compresses to xz. In most cases, xz achieves higher compression rates than alternatives like zip, [3] gzip and bzip2. Decompression speed is higher than bzip2, but lower than gzip.