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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.
The 7-Zip program is publicly available under the terms of the GNU Lesser General Public License. The LZMA SDK 4.62 was placed in the public domain in December 2008. The latest stable version of 7-Zip and LZMA SDK is version 24.09. [2] The 7z file format specification is distributed with 7-Zip's source code since 2015.
A ZIP64 local file extra field record, for example, has the signature 0x0001 and a length of 16 bytes (or more) so that two 64-bit values (the uncompressed and compressed sizes) may follow. Another common local file extension is 0x5455 (or "UT") which contains 32-bit UTC UNIX timestamps. This is immediately followed by the compressed data.
PeaZip has full support for Brotli, Zstandard, various LPAQ and PAQ formats, QUAD / BALZ / BCM (highly efficient ROLZ based compressors), FreeArc format, and for its native PEA format. 7-Zip includes read support for .msi , cpio and xar , plus Apple's dmg / HFS disk images and the deb / .rpm package distribution formats; beta versions (9.07 ...
Mach-O binary (64-bit) FE ED FE ED: þíþí: 0 JKS Javakey Store [32] CE FA ED FE: Îúíþ: 0 Mach-O binary (reverse byte ordering scheme, 32-bit) [33] CF FA ED FE: Ïúíþ: 0 Mach-O binary (reverse byte ordering scheme, 64-bit) [33] 25 21 50 53 %!PS: 0 ps PostScript document: 25 21 50 53 2D 41 64 6F 62 65 2D 33 2E 30 20 45 50 53 46 2D 33 2E ...
A library format used primarily on the Commodore 64 and 128 lines of computers. This bears no resemblance to the DOS LBR format. While library files were quick to implement (a number of programs exist to work with them) they are crippled in that they cannot grow with use: once a file has been created it cannot be amended (files added, changed ...
The author, Wei Dai states "This code is less clever, but hopefully more understandable and maintainable [than zlib]". 7-Zip: written by Igor Pavlov in C++, this version is freely licensed and achieves higher compression than zlib at the expense of CPU usage. Has an option to use the DEFLATE64 storage format.
In the 7-zip LZMA file format, configuration is performed by a header containing the "properties" byte followed by the 32-bit little-endian dictionary size in bytes. In LZMA2, the properties byte can optionally be changed at the start of LZMA2 LZMA packets, while the dictionary size is specified in the LZMA2 header as later described.