Compression

Apache Commons Compress defines an API for working with compression and archive formats. These include bzip2, gzip, pack200, LZMA, XZ, Snappy, traditional Unix Compress, DEFLATE, DEFLATE64, LZ4, Brotli, Zstandard and ar, cpio, jar, tar, zip, dump, 7z, arj.

XZ data compression

(Experimental/Contrib) A library for working with the compression/decompression of Arrow data.

Java Image I/O plugin for reading JBIG2-compressed image data. Formerly known as the levigo JBig2 ImageIO plugin (com.levigo.jbig2:levigo-jbig2-imageio).

Brotli is a generic-purpose lossless compression algorithm.

Ktor is a framework for quickly creating web applications in Kotlin with minimal effort.

Support for archiving a Git tree in formats such as zip and tar. This is a separate bundle from org.eclipse.jgit to avoid a dependency by the latter on commons-compress.

Apache MINA is a network application framework which helps users develop high performance and highly scalable network applications easily. It provides an abstract event-driven asynchronous API over various transports such as TCP/IP and UDP/IP via Java NIO.

Roaring bitmaps are compressed bitmaps (also called bitsets) which tend to outperform conventional compressed bitmaps such as WAH or Concise.

The YUI Compressor is a JavaScript compressor which, in addition to removing comments and white-spaces, obfuscates local variables using the smallest possible variable name. This obfuscation is safe, even when using constructs such as 'eval' or 'with' (although the compression is not optimal is those cases) Compared to jsmin, the average savings is around 20%.

Sux4j is an implementation of succinct data structure in Java. It provides a number of related implementations covering ranking/selection over bit arrays, compressed lists and minimal perfect hashing.

Javascript/CSS bundling and compressing tool for java web apps. By using jawr resources are automatically bundled together and optionally minified and gzipped. Jawr provides tag libraries to reference a generated bundle either by id or by using the name of any of its members.

Provides tasks and types that deal with AR, ARJ, CPIO, TAR, DUMP, 7Z and ZIP archives as well as BZIP2, PACK200, GZIP, LZMA, Snappy, LZ4, Brotli and XZ compressed files based on Apache Commons Compress.

Picture Selector Library for Android

A J2EE servlet filter which compresses data written to the response. It supports several algorithms (gzip, deflate, etc.) and emphasizes minimal memory usage and high throughput. Also provides detailed performance stats.

Roaring bitmaps are compressed bitmaps (also called bitsets) which tend to outperform conventional compressed bitmaps such as WAH or Concise.

Javascript/CSS bundling and compressing tool for java web apps. By using jawr resources are automatically bundled together and optionally minified and gzipped. Jawr provides tag libraries to reference a generated bundle either by id or by using the name of any of its members.

It is a library to compress and uncompress arrays of integers very fast. The assumption is that most (but not all) values in your array use less than 32 bits.

Java ports and bindings of the LZ4 compression algorithm and the xxHash hashing algorithm

A lossless data compression algorithm that is focused on compression and decompression speed.

A fast lossless compression algorithm, targeting real-time compression scenarios at zlib-level and better compression ratios.

Java ports and bindings of the LZ4 compression algorithm and the xxHash hashing algorithm

Implementation of CONCISE (COmpressed 'N" Composable Integer SEt) bit map compression algorithm by Alessandro Colantonio with some enhanced features - http://ricerca.mat.uniroma3.it/users/colanton/docs/concise.pdf

JNI bindings for Zstd native library that provides fast and high compression lossless algorithm for Java and all JVM languages.

A bundle project producing JAX-RS RI bundles. The primary artifact is an "all-in-one" OSGi-fied JAX-RS RI bundle (jaxrs-ri.jar). Attached to that are two compressed JAX-RS RI archives. The first archive (jaxrs-ri.zip) consists of binary RI bits and contains the API jar (under "api" directory), RI libraries (under "lib" directory) as well as all external RI dependencies (under "ext" directory). The secondary archive (jaxrs-ri-src.zip) contains buildable JAX-RS RI source bundle and contains the API jar (under "api" directory), RI sources (under "src" directory) as well as all external RI dependencies (under "ext" directory). The second archive also contains "build.xml" ANT script that builds the RI sources. To build the JAX-RS RI simply unzip the archive, cd to the created jaxrs-ri directory and invoke "ant" from the command line.

The bit array data structure is implemented in Java as the BitSet class. Unfortunately, this fails to scale without compression. JavaEWAH is a word-aligned compressed variant of the Java bitset class. It uses a 64-bit run-length encoding (RLE) compression scheme. The goal of word-aligned compression is not to achieve the best compression, but rather to improve query processing time. Hence, we try to save CPU cycles, maybe at the expense of storage. However, the EWAH scheme we implemented is always more efficient storage-wise than an uncompressed bitmap (implemented in Java as the BitSet class). Unlike some alternatives, javaewah does not rely on a patented scheme.

Compression algorithms

The purpose of this project is to reduce the number of requests needed to load a page and the amount of data to transfer to clients, achieving drastic improvement of loading times. The resources can be benefit also from minification and compression.

Ktor is a framework for quickly creating web applications in Kotlin with minimal effort.

Implementation of CONCISE (COmpressed 'N" Composable Integer SEt) bit map compression algorithm by Alessandro Colantonio with some enhanced features - http://ricerca.mat.uniroma3.it/users/colanton/docs/concise.pdf

The purpose of this project is to reduce the number of requests needed to load a page and the amount of data to transfer to clients, achieving drastic improvement of loading times. The resources can be benefit also from minification and compression.

This bundle exports org.apache.commons.compress

Pure Java compression support using lz4-java

Pure Java compression support using Xerial Snappy

Pure Java compression support using Aircompressor codecs

Pure Java compression support using XZ for Java

Compression support using Brotli4j

Pure Java compression support using zstd-jni

Downloads and builds FFmpeg libraries for both 32 and 64 bit including the zlib and bzip2 compression libraries. Configuration: ./configure --enable-small --disable-programs --disable-doc --disable-avfilter --disable-postproc --disable-swscale --disable-avdevice --disable-filters --disable-decoder=flash*,truemotion*,tmv,eacmv,eamad,eatgq,eatgv,eatqi,flic,h26*,msmpeg*,mpeg2*,mpeg4*,mpeg_vdpau,mpeg_xvmc,mpegvideo,msvideo*,vp*,aic,amv,asv*,aura,aura2,avr*,c93,clearvideo,cinepak,cljr,cllc,cpia,dirac,hevc,rtp*,srtp,vc1,swf,indeo*,v2*,v3*,v4* --disable-demuxer=h26*,msmpeg*,mpeg2*,mpeg4*,mpeg_vdpau,mpeg_xvmc,mpegvideo,vp*,aic,amv,asv*,aura,aura2,avr*,c93,clearvideo,cinepak,cljr,cllc,cpia,dirac,hevc,rtp*,srtp,vc1,swf,flic,flv,segafilm,v2*,v3*,v4*,tmv,filmstrip --disable-encoders --enable-encoder=pcm* --disable-parser=h2*,vc1,vp*,dirac,hevc,rv* --disable-protocol=rt*,srt*,gopher,ftp --disable-muxers --disable-indevs --disable-outdevs --disable-iconv --disable-dxva2

Implementation of CONCISE (COmpressed 'N" Composable Integer SEt) bit map compression algorithm by Alessandro Colantonio with some enhanced features - http://ricerca.mat.uniroma3.it/users/colanton/concise.html

Compression codec for LZF encoding for particularly encoding/decoding, with reasonable compression. Compressor is basic Lempel-Ziv codec, without Huffman (deflate/gzip) or statistical post-encoding. See "http://oldhome.schmorp.de/marc/liblzf.html" for more on original LZF package.

Header Compression for HTTP/2

This OSGi bundle wraps mina-core, mina-filter-codec-netty, mina-filter-compression, mina-filter-ssl, mina-integration-jmx, and mina-integration-spring 1.1.7 jar files.

booster-task-compression

WebJar for compression

eXist-db XQuery Compression Module

The purpose of this project is to reduce the number of requests needed to load a page and the amount of data to transfer to clients, achieving drastic improvement of loading times. The resources can be benefit also from minification and compression.

A simple library that facades org.apache.commons.compress, to provide an easy-to-use API for archiving and compressing into and out of File objects.

Implements the time series compression methods as described in the Facebook's Gorilla paper