![]() ![]() Here are tested examples of using XZ Utils pure java library to pack and unpack XZ archives with LZMA2 compression algorithm with great ratio. LzmaCompressor lzmaCompressor = new LzmaCompressor(rawFile, compressedFile) But the required 30 is almost unreachable. 7z a -m0lzma2 -mx filename.7z filename.pptx. Documentation states lzma2 handles better data that can not be compressed, so you can try with. Path compressedFile = Paths.get("compressed.lzma") You can not expect a lot of compression on an already compressed file. You can use this website to generate random text.Įxample compression and decompression Path rawFile = Paths.get("raw.txt") New FileOutputStream(rawFilePath.toFile())))įirstly you have to create a file with content to start compressing. OutputStream outputStream = new BufferedOutputStream( ![]() New BufferedInputStream(new FileInputStream(compressedFilePath.toFile())), Try (LzmaInputStream inputStream = new LzmaInputStream( Public void decompress() throws IOException InputStream inputStream = new BufferedInputStream(new FileInputStream(rawFilePath.toFile()))) New BufferedOutputStream(new FileOutputStream(compressedFilePath.toFile()))) Try (LzmaOutputStream outputStream = new LzmaOutputStream.Builder( Public void compress() throws IOException Public LzmaCompressor(Path rawFilePath, Path compressedFilePath) XZOutputStream out = new XZOutputStream(outfile, options) tPreset(7) // play with this number: 6 is default but 7 works better for mid sized archives ( > 8mb) LZMA2Options options = new LZMA2Options() Using the java library is as easy as this: FileInputStream inFile = new FileInputStream("src.tar") įileOutputStream outfile = new FileOutputStream("") Thus you need to zip/tar the source folder(s) into a single uncompressed file first. The XZ file format is designed to store 1 file only. The guys that invented the XZ format build a pure java implementation of the XZ archive compression / extraction algorithms ![]() XZ is a file format based on LZMA2 (an improved version of LZMA) A pure Java implementation on a modern JVM (1.7 ) is as fast as a C one and has less dependecies and portability issues. The 7zip sdk is old and unmaintained and it's just a JNI wrapper around the C library. d 5 :: let program look up compress-able file inside archive 5 times ct 8 :: let 7z compress file with 8 threads wt 2 :: let program run 2 instance of 7zip "C:\Users\Administrator\Downloads" :: scan files inside folder Downloads > python py7zRecompress.py "C:\Users\Administrator\Downloads" -wt 2 -ct 8 -d 5 -s no -dc 128 > python py7zRecompress.py "C:\Users\Administrator\Downloads" "C:\Users\Administrator\Documents" or you can do this Well, the JAR utility only supports jar files (which are really just zip files). > python py7zRecompress.py "C:\Users\Administrator\Downloads" h : show all help Example : you can leave it alone like so skip yes|no : skip locked file (default : yes if password is empty) ea string : additional argument when extract for 7zip ca string : additional argument when compress for 7zip p string : file password (use when archive is locked) t int : extract timeout (default : 900 -> 15mins) i iso wim will re-compress default file extensions and. 7z (under archive format of course) and look for the create SFX archive which should work after making the archive format. 7z path : path to 7z executable (default : " 7z.exe| 7z") 1 Open 7Zip File manager (7zFM.exe) 2 Find the Files, which can be anything, and then click the big green 'Add' button. dc int : size of dictionary in MegaBytes used by 7z and xz (default : 96) s yes|no : use compress algorithm same with file extension (default : no) d int : How deep to re-compress (useful when you have zip inside zip again and again) (default : 2) ct int : Thread count used by 7zip (default : 3) wt int : Working thread count (default : 1) ![]() : Folder that contains compress-able files Run! $ python py7zRecompress.py įolder path. Windows : download and install 7zip and Python Ubuntu : $ sudo apt-get install -y python3 p7zip* ![]()
0 Comments
Leave a Reply. |