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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.
Open, modular architecture that allows any compression, conversion, or encryption method to be stacked. High compression ratios (depending on the compression method used). AES-256 bit encryption. Zip 2.0 (Legacy) Encryption; Large file support (up to approximately 16 exbibytes, or 2 64 bytes). Unicode file names.
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 ...
The Free Software project 7-Zip also supports AES, but not SES in ZIP files (as does its POSIX port p7zip). When using AES encryption under WinZip, the compression method is always set to 99, with the actual compression method stored in an AES extra data field. [54]
This leads to Deflate64 having a longer compression time, and potentially a slightly higher compression ratio, than Deflate. [7] Several free and/or open source projects support Deflate64, such as 7-Zip , [ 8 ] while others, such as zlib , do not, as a result of the proprietary nature of the procedure [ 9 ] and the very modest performance ...
The LZMA compression algorithm as used by 7-Zip. .lzo application/ x-lzop: lzop: Unix-like An implementation of the LZO data compression algorithm. .rz rzip: Unix-like A compression program designed to do particularly well on very large files containing long distance redundancy. .sfark sfArk: Windows compress/decompress- Linux and macOS ...
A common way of handling this situation is quoting input, or uncompressible parts of the input in the output, minimizing the compression overhead. For example, the zip data format specifies the 'compression method' of 'Stored' for input files that have been copied into the archive verbatim. [22]
On newer formats such as 7-zip, there is a solid block size option that allows for the concatenated data block to be split into individually-compressed smaller blocks, so that only a limited amount of data in the block must be processed in order to extract one file. Parameters control the maximum solid block window size, the number of files in ...