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The LZ4 algorithm aims to provide a good trade-off between speed and compression ratio. Typically, it has a smaller (i.e., worse) compression ratio than the similar LZO algorithm, which in turn is worse than algorithms like DEFLATE.
They are also known as Lempel-Ziv 1 (LZ1) and Lempel-Ziv 2 (LZ2) respectively. [3] These two algorithms form the basis for many variations including LZW , LZSS , LZMA and others. Besides their academic influence, these algorithms formed the basis of several ubiquitous compression schemes, including GIF and the DEFLATE algorithm used in PNG and ...
gzip is a file format and a software application used for file compression and decompression.The program was created by Jean-loup Gailly and Mark Adler as a free software replacement for the compress program used in early Unix systems, and intended for use by GNU (from which the "g" of gzip is derived).
Thus, a representation that compresses the storage size of a file from 10 MB to 2 MB yields a space saving of 1 - 2/10 = 0.8, often notated as a percentage, 80%. For signals of indefinite size, such as streaming audio and video, the compression ratio is defined in terms of uncompressed and compressed data rates instead of data sizes:
The scenario described by Welch's 1984 paper [1] encodes sequences of 8-bit data as fixed-length 12-bit codes. The codes from 0 to 255 represent 1-character sequences consisting of the corresponding 8-bit character, and the codes 256 through 4095 are created in a dictionary for sequences encountered in the data as it is encoded.
1989 NeXTSTEP 1.0 pax and gzip: Yes ? ? Yes ? RPM Package Manager (RPM) .rpm Red Hat: 1995 Red Hat Linux 1.0 cpio and gzip: Yes ? ? ? 1 s Slackware Package .tgz Patrick Volkerding: 1993 Slackware 1.0 tar and gzip: Yes No No ? ? Windows Installer (also MSI) .msi Microsoft: 2000 Windows 2000: OLE Structured Storage, Cabinet and SQL: Optional ...
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.
The next block's header consists of 093f, broken down as 09 16 ⇒ off h =000 2,len−4=010 2;type=01 2: type 1 indicates a "copy with 1-byte offset": the length to copy works out to 010 2 +4=6 bytes, and the offset is an 11-bit integer whose top bits are off h and whose low bits are the next byte: 3f, so {off h}{3f 16}=00000111111 2 =63. [11 ...