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A Java-based library for extracting the contents of 7zip archives
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Glen Aultman-Bettridge 0a8466b5f2 Merge pull request #2 from asimy/master 
When pointed at an invalid 7z archive, we'll now throw an Invalid7zArchi...
 		2013-10-31 11:31:26 -07:00
src When pointed at an invalid 7z archive, we'll now throw an Invalid7zArchiveError 2013-10-31 12:29:19 -06:00
LGPL.txt initial commit of the J7Zip 4.43-alpha2 code (unmodified) 2013-10-28 12:07:20 -06:00
MainClass.mf initial commit of the J7Zip 4.43-alpha2 code (unmodified) 2013-10-28 12:07:20 -06:00
build.xml Adds the ability to specify a destination directory for extracted files (default is current working directory) 2013-10-28 15:27:55 -06:00
history.txt Adds the ability to specify a destination directory for extracted files (default is current working directory) 2013-10-28 15:27:55 -06:00
readme.md and the last compulsive change to the readme (for a little while at least) 2013-10-28 15:53:00 -06:00

readme.md

j7zip-extractor

j7zip-extractor is a fork of the J7Zip project intended to be used only for extracting the contents of a 7zip archive into a specified directory. Consequently, it doesn't support creating 7z archives or listing their contents.

This version supports only

  • non-encrypted archives

  • archives with Copy or LZMA codec.

j7zip-extractor also includes a version of the JAVA LZMA SDK.

LZMA is default and general compression method of 7z format in 7-Zip compression program (www.7-zip.org). LZMA provides high compression ratio and very fast decompression.

LZMA is an improved version of famous LZ77 compression algorithm. It was improved in way of maximum increasing of compression ratio, keeping high decompression speed and low memory requirements for decompressing.

LICENSE

LGPL (see LGPL.txt) read also: http://www.gnu.org/licenses/lgpl-java.html

How To Compile

With ant (any system with http://ant.apache.org/)

  • remove all build artifacts

    ant clean

  • build dist/j7zip-extractor.jar

    ant

Note: this code compiles with JAVA 5 or later

How To Use

The executable j7zip-extractor

  • Tests archive files

    java -jar dist/j7zip-extractor.jar t archive.7z

  • Extracts files from archive to their full paths in the current directory

    java -jar dist/j7zip-extractor.jar x archive.7z

  • Extracts files from archive to their full paths under a given directory

    java -jar dist/j7zip-extractor.jar x archive.7z target_dir

The jar j7zip-extractor.jar

Please read SevenZip\J7zip.java and SevenZip\ArchiveExtractCallback.java as samples. Look at

SevenZip.Archive.SevenZip.Handler

SevenZip.Archive.SevenZipEntry

SevenZip.Archive.IArchiveExtractCallback

SevenZip.Archive.IInArchive

The executable LZMA (this hasn't been tested under the new code)

to decompress:

java -cp dist/j7zip-extractor.jar SevenZip.LzmaAlone d file.lzma file

TODO

  1. Add tests
  2. Support creation of 7-zip archives
  3. Improve speed
  4. Support compression methods: PPMd, BZip2
  5. Support encrypted archives

Copyright

Marked portions of the code are Copyright (c) by OpenLogic, Inc.

The remaining code is provided by the p7zip project at http://p7zip.sourceforge.net.

All code licensed under the GNU LESSER GENERAL PUBLIC LICENSE. See LGPL.txt for full details.