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Tino Reichardt
2017-05-25 19:08:58 +02:00
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# README
This is the Github Page of 7-Zip ZS with support of additional Codecs.
for **zstd**, short for
Zstandard, which is a fast lossless compression algorithm, targeting
real-time compression scenarios at zlib-level compression ratio.
LZ4 and LZ5 compression with multithreading is also included.
The library used therefore is located here: [Multithreading Library](https://github.com/mcmilk/zstdmt)
This is the Github Page of 7-Zip ZS with support of additional Codecs. The library used therefore is located here: [Multithreading Library](https://github.com/mcmilk/zstdmt)
You can install it in two ways:
1. full setup with [ZStandard] additions within the GUI and an modified
Explorer context menu
2. just the codec plugin, which goes to your existing 7-Zip installation
# Codec overview
1. [Zstandard] is a real-time compression algorithm, providing high compression ratios. It offers a very wide range of compression / speed trade-off, while being backed by a very fast decoder.
2. [Brotli] is a generic-purpose lossless compression algorithm that compresses data using a combination of a modern variant of the LZ77 algorithm, Huffman coding and 2nd order context modeling, with a compression ratio comparable to the best currently available general-purpose compression methods. It is similar in speed with deflate but offers more dense compression.
3. [LZ4] is lossless compression algorithm, providing compression speed at 400 MB/s per core (0.16 Bytes/cycle). It features an extremely fast decoder, with speed in multiple GB/s per core (0.71 Bytes/cycle). A high compression derivative, called LZ4_HC, is available, trading customizable CPU time for compression ratio.
4. [LZ5] is a modification of LZ4 which gives a better ratio at cost of slower compression and decompression.
5. [Lizard] is an efficient compressor with very fast decompression. It achieves compression ratio that is comparable to zip/zlib and zstd/brotli (at low and medium compression levels) at decompression speed of 1000 MB/s and faster.
## 7-Zip ZStandard Edition (full setup, with GUI and Explorer integration)
### Installation (via setup)
@@ -76,7 +79,8 @@ Codecs:
- compression and decompression for [Brotli], [Lizard], [LZ4], [LZ5] and [ZStandard]
- included lzip decompression support, patch from http://download.savannah.gnu.org/releases/lzip/7zip/
- right click and ```compress to archive``` will use the last selected method (codec, level and threads)
- right click and _"Add to xy.7z"_ will use the last selected method (codec, level and threads)
- the FileManager ListBox will show more information about these codecs now
```
7z a archiv.7z -m0=zstd -mx0 Zstandard Fastest Mode, without BCJ preprocessor