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  2. 7z - Wikipedia

    en.wikipedia.org/wiki/7z

    7z is a compressed archive file format that supports several different data compression, encryption and pre-processing algorithms. The 7z format initially appeared as implemented by the 7-Zip archiver. The 7-Zip program is publicly available under the terms of the GNU Lesser General Public License.

  3. Lempel–Ziv–Markov chain algorithm - Wikipedia

    en.wikipedia.org/wiki/Lempel–Ziv–Markov_chain...

    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 ...

  4. List of file signatures - Wikipedia

    en.wikipedia.org/wiki/List_of_file_signatures

    Windows Update Binary Delta Compression file [59] 37 7A BC AF 27 1C: 7z¼¯'␜ 0 7z 7-Zip File Format 1F 8B ␟‹ 0 gz tar.gz GZIP compressed file [60] FD 37 7A 58 5A 00: ý7zXZ␀ 0 xz tar.xz XZ compression utility using LZMA2 compression 04 22 4D 18 ␄"M␘ 0 lz4 LZ4 Frame Format [61] Remark: LZ4 block format does not offer any magic bytes ...

  5. 7-Zip - Wikipedia

    en.wikipedia.org/wiki/7-Zip

    7-Zip is a free and open-source file archiver, a utility used to place groups of files within compressed containers known as "archives". It is developed by Igor Pavlov and was first released in 1999. [2] 7-Zip has its own archive format called 7z introduced in 2001, [12] but can read and write several others.

  6. List of archive formats - Wikipedia

    en.wikipedia.org/wiki/List_of_archive_formats

    Based on PAQ, RZM, CSC, CCM, and 7zip. The format consists of a PAQ, RZM, CSC, or CCM compressed file and a manifest with compression settings stored in a 7z archive. .uha UHarc DOS/Windows: DOS/Windows: Yes A high compression rate archive format originally for DOS. .war WAR: Multiple Multiple Yes Web Application archive (Java-based web app) .wim

  7. zstd - Wikipedia

    en.wikipedia.org/wiki/Zstd

    Zstandard is a lossless data compression algorithm developed by Yann Collet at Facebook. Zstd is the corresponding reference implementation in C, released as open-source software on 31 August 2016.

  8. Lossless compression - Wikipedia

    en.wikipedia.org/wiki/Lossless_compression

    Most lossless compression programs do two things in sequence: the first step generates a statistical model for the input data, and the second step uses this model to map input data to bit sequences in such a way that "probable" (i.e. frequently encountered) data will produce shorter output than "improbable" data.

  9. Magic number (programming) - Wikipedia

    en.wikipedia.org/wiki/Magic_number_(programming)

    Headers in 7z files begin with "7z" (full magic number: 37 7A BC AF 27 1C). Detection. The Unix utility program file can read and interpret magic numbers from files, and the file which is used to parse the information is called magic. The Windows utility TrID has a similar purpose.

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