Compress 1.0.3
封装文件压缩或解压缩
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Release Notes
Summary of changes made in this release of the package.
Dependencies
- SharpZipLib(>= 0.86.0)
GitHub Usage
This package is not used by any popular GitHub repositories.
Version History
| Version | Downloads | Last updated |
|---|---|---|
| 1.0.3 | 230 | 4/23/2019 |
| 1.0.2 | 131 | 4/14/2019 |
| 1.0.1 | 134 | 4/14/2019 |
Overview
LZF-compress is a Java library for encoding and decoding data in LZF format,written by Tatu Saloranta (tatu.saloranta@iki.fi)
Data format and algorithm based on original LZF library by Marc A Lehmann.See LZF Format Specification for full description.
Format differs slightly from some other adaptations, such as the one usedby H2 database project (by Thomas Mueller);although internal block compression structure is the same, block identifiers differ.This package uses the original LZF identifiers to be 100% compatible with existing command-line lzf tool(s).
LZF algorithm itself is optimized for speed, with somewhat more modest compression.Compared to the standard Deflate (algorithm gzip uses) LZF can be 5-6 times as fast to compress,and twice as fast to decompress. Compression rate is lower since no Huffman-encoding is usedafter lempel-ziv substring elimination.
Usage
See Wiki for more details; here's a 'TL;DNR' version.
Both compression and decompression can be done either by streaming approach:
or by block operation:
and you can even use the LZF jar as a command-line tool (it has manifest that points to 'com.ning.compress.lzf.LZF' as the class having main() method to call), like so:
(which will display necessary usage arguments for -c(ompressing) or -d(ecompressing) files.
Parallel processing
Since the compression is more CPU-heavy than decompression, it could benefit from concurrent operation.This works well with LZF because of its block-oriented nature, so that although there is need forsequential processing within block (of up to 64kB), encoding of separate blocks can be done completelyindependently: there are no dependencies to earlier blocks.
Compressor 1023-rr3-001
The main abstraction to use is PLZFOutputStream which a FilterOutputStream and implementsjava.nio.channels.WritableByteChannel as well. It use is like that of any OutputStream:
Interoperability
Besides Java support, LZF codecs / bindings exist for non-JVM languages as well:
- C: liblzf (the original LZF package!)
- C#: C# LZF
- Go: Golly
- Javascript(!): freecode LZF (or via SourceForge)
- Perl: Compress::LZF
- Python: Python-LZF
- Ruby: glebtv/lzf, LZF/Ruby
Related
Check out jvm-compress-benchmark for comparison of space- and time-efficiency of this LZF implementation, relative other available Java-accessible compression libraries.
More
Project Wiki.
Compress 100 Kb Pdf
Alternative High-Speed Lempel-Ziv Compressors
Compress 100 Kb
LZF belongs to a family of compression codecs called 'simple Lempel-Ziv' codecs.Since LZ compression is also the first part of deflate compression (which is used,along with simple framing, for gzip), it can be viewed as 'first-part of gzip'(second part being Huffman-encoding of compressed content).
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Compressor 101
There are many other codecs in this category, most notable (and competitive being)
Compression 101
all of which have very similar compression ratios (due to same underlying algorithm,differences coming from slight encoding variations, and efficiency differences inback-reference matching), and similar performance profiles regarding ratio ofcompression vs uncompression speeds.