TrueZIP is a Java based virtual file system (VFS) implementation for transparent read/write access to archive files as if they were directories.

See:
Description

Packages

de.schlichtherle	Contains utility main classes for various archive file operations.
de.schlichtherle.awt	Custom AWT GUI classes.
de.schlichtherle.crypto	Utility classes for general cryptograpic purposes.
de.schlichtherle.crypto.generators	Pseudo Random Number Generators (PRNG).
de.schlichtherle.crypto.io	Utility classes for encryption and decryption.
de.schlichtherle.crypto.io.raes	Reads and writes files according to the Random Access Encryption Specification (RAES).
de.schlichtherle.crypto.modes	Block cipher modes.
de.schlichtherle.io	Start here: Provides transparent read/write access to archive files and their entries as if they were (virtual) directories and files.
de.schlichtherle.io.archive	Essential interfaces which are required by archive drivers to interface with the package de.schlichtherle.io.
de.schlichtherle.io.archive.spi	The Service Provider Interface (SPI) for pluggable archive drivers.
de.schlichtherle.io.archive.tar	The archive driver family for TAR files.
de.schlichtherle.io.archive.zip	The archive driver family for ZIP files.
de.schlichtherle.io.archive.zip.raes	The archive driver family for RAES encrypted ZIP files.
de.schlichtherle.io.rof	Provides random read only access to files (as opposed to the random read/write access provided by RandomAccessFile).
de.schlichtherle.io.swing	Swing GUI classes to browse the file system, including archive files.
de.schlichtherle.io.swing.tree	Support classes for the package de.schlichtherle.io.swing.
de.schlichtherle.io.util	Utility interfaces and classes for I/O.
de.schlichtherle.key	An extensible, generalized manager for keys of arbitrary type required to create or open protected resources.
de.schlichtherle.key.passwd.console	The console I/O based implementation of the abstract base class KeyManager in the package de.schlichtherle.key.
de.schlichtherle.key.passwd.swing	The Swing GUI based implementation of the abstract base class KeyManager in the package de.schlichtherle.key.
de.schlichtherle.nio.charset	A custom implementation of the "IBM437" character set.
de.schlichtherle.nio.charset.spi	A custom implementation of the "IBM437" character set.
de.schlichtherle.swing	Custom Swing GUI classes.
de.schlichtherle.swing.event	Support classes for the package de.schlichtherle.swing.
de.schlichtherle.util	General utility classes.
de.schlichtherle.util.regex
de.schlichtherle.util.zip	A drop-in replacement for the classes in the package java.util.zip which read and write ZIP files.

TrueZIP is a Java based virtual file system (VFS) implementation for transparent read/write access to archive files as if they were directories. Archive files may be arbitrarily nested and the nesting level is only limited by heap and file system size. TrueZIP's design strategy is to "make simple things easy and complex things possible".

For example, when using the default configuration, the instance new File("app.ear/web.war/WEB-INF/lib/lib.jar/META-INF/MANIFEST.MF") would refer to the text file entry META-INF/MANIFEST.MF within the JAR file entry WEB-INF/lib/lib.jar within the WAR file entry web.war within the EAR file app.ear. The same applies for any other supported and configured archive type.

Limitation: TrueZIP works on files only. If an archive is just available as an InputStream, it needs to be saved to a (temporary) file first. If this is not an option, TrueZIP can't be used.

TrueZIP provides a pluggable archive driver architecture to support virtually any archive type: Out of the box, TrueZIP supports ZIP, SFX/EXE, JAR, TZP, TAR, TAR.BZ2 and TAR.GZ. This list will be extended in future releases. Note that some of these archive types require additional JARs on the runtime class path.

To be minimal intrusive, TrueZIP provides drop-in replacements for many classes in the java.io package. This reduces the learning curve to the essential minimum and allows to introduce TrueZIP's functionality gradually within legacy applications or even other VFS solutions which are currently built on top of java.io.File*.

TrueZIP 6 requires only a J2SE 1.4.2 compatible Java Runtime Environment, but version 6.4 and later automatically benefit from new features available in JSE 5 and even JSE 6.

TrueZIP 6 is covered under the Apache License, Version 2.0.

Support

Please subscribe to the user mailing list via users-subscribe@truezip.dev.java.net to get support and feel free to tell me what you think about TrueZIP. I'm always interested in your opinion, be it good or bad! But read on first, please.

Default Configuration

In TrueZIP 6.5, the following archive types and access parameters are defined by the default configuration resource file in truezip.jar/META-INF/services/de.schlichtherle.io.ArchiveDriverRegistry.properties. Note that only the archive file suffixes "ear|jar|war|zip" are recognized in file paths by default.

Type	Canonical Suffixes0	DEFAULT1	ALL2	Charset3	Dependencies4	Description
ZIP	zip	Yes	Yes	IBM4375		ZIP file: Archive file with central directory and compressible entries
JAR	ear|jar|war	Yes	Yes	UTF-8		Java Archive: ZIP with custom directory tree layout
ODF	odb|odf|odg|odm|odp|ods|odt|otg|oth|otp|ots|ott	No	Yes	UTF-8		OpenDocument Format: If present, the mimetype entry is written first with STORED method.
TZP	tzp|zip.rae|zip.raes	No	Yes	UTF-8	lcrypto.jar6	RAES encrypted ZIP file.
SFX/EXE	exe	No	Yes	system specific		ZIP file with a code preamble for self extraction. This driver is pretty slow.
TAR	tar	No	Yes	US-ASCII7	ant.jar8	TAR: Uncompressed tape archive file.
TAR.BZ2	tbz2|tar.bz2	No	Yes	US-ASCII7	ant.jar8	TAR file wrapped in BZIP2 compression format.
TAR.GZ	tar.gz|tgz	No	Yes	US-ASCII7	ant.jar8	TAR file wrapped in GZIP compression format.

⁰ Suffix recognition is case insensitive with the DefaultArchiveDetector class.
¹ Recognized by the predefined instance ArchiveDetector.DEFAULT? Note that this may be extended (but not restricted) in future releases.
² Recognized by the predefined instance ArchiveDetector.ALL? Note that this may be extended (but not restricted) in future releases.
³ The code page to use for entry names and other entry meta data. This access parameter is determined by the archive driver (not the archive detector) and can be customized by subclassing it.
⁴ This needs to be on the runtime class path.
⁵ The charset for ZIP files is not specified. This is a heuristic value which is based on the fact that IBM437 is the original PC character set for the USA and the ZIP file format has been invented there. Do not rely on this!
⁶ Bouncy Castle's Lightweight Crypto API for JDK 1.4, version 1.30 or higher. Available at http://www.bouncycastle.org/latest_releases.html.
⁷ The charset for TAR files is not specified. This is a heuristic value which is based on the fact that the TAR file format stems from UNIX implementations of the seventies.
⁸ Apache's Ant, version 1.6.5 or higher. Version 1.7.0 is recommended for enhanced performance and stability and is required for BZIP2 compression. Available at http://ant.apache.org.