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FZip

FZip is an Actionscript 3 class library to load, modify and create standard ZIP archives.

FZip parses ZIP archives progressively, allowing access to contained files while the archive is loading.

Limitations

When run in the Flash Player browser plugin, FZip can't uncompress compressed files in ZIPs. See Checksum Patch below to workaround this. This doesn't apply when FZip runs in AIR, or when files are stored uncompressed.
FZip generally can't read ZIPs that make use of Data Descriptors. Examples of such ZIPs are those created by the Mac OS X Archiver utility, SWCs, JARs, etc.

Checksum Patch

In order to be able to decompress compressed files in a ZIP archive, FZip requires the presence of an Adler32 checksum in addition to the standard CRC32 checksums contained in ZIP archives.

We provide a Python script that unobtrusively injects Adler32 checksums into ZIP archives. It is included in the FZip distribution under the 'tools' directory. In order to use this script, Python needs to be installed.

This patch is not required if FZip runs in the Adobe AIR runtime, or if the files in the ZIP archive are stored uncompressed (formats such as GIF, JPEG, PNG or SWF for example are already compressed and do not need to be recompressed).

Demo

Loads a ZIP archive containing 1000 PNG icons (available for download from famfamfam) and displays the icons on screen while loading.

Launch demo (requires Flash Player 9)

Demo source code

API Documentation

ASDocs

Download

FZip 1.0.062

History

FZip 1.0.062 (02/28/2008)

Bug fix: Using namespaces for states seemed to be not a very good idea, some users experienced weird RTEs when parsing ZIPs. We now use function references to maintain state which seems to work much better. If you ever got a ReferenceError: Error #1065: Variable parse is not defined. at deng.fzip::FZipFile/parse(), this is very much likely fixed now.

FZip 1.0.059 (02/25/2008)

New API function (contributed by Ray Greenwell, thanks!)
- loadBytes(bytes:ByteArray):void
The serialize method now writes Adler32 checksums if the new includeAdler32 argument is set to true.

FZip 1.0.055 (12/21/2007)

Bug fix: Compiler errors in non-AIR projects and development environments.

New API functions to create/modify ZIP archives:

addFile(name:String, content:ByteArray = null):FZipFile

addFileAt(index:uint, name:String, content:ByteArray = null):FZipFile

addFileFromString(name:String, content:String, charset:String = "utf-8"):FZipFile

addFileFromStringAt(index:uint, name:String, content:String, charset:String = "utf-8"):FZipFile

```
removeFileAt(index:uint):FZipFile
```
```
serialize(stream:IDataOutput):void
```

FZip 1.0.051 (10/04/2007)

Adobe AIR Beta 2 deprecated ByteArray.inflate(), FZip was thus no longer working in AIR. Fixed, FZip now uses ByteArray.uncompress(CompressionAlgorithm.DEFLATE).
Parse errors now throw an exception if no event listener is found for FZipErrorEvent.PARSE_ERROR.

FZip 1.0.049 (07/13/2007)

Bug fix: Adobe AIR support introduced a critical bug that made FZip stop working in the regular Flash Player.

FZip 1.0.048 (06/25/2007)

Bug fix: Typos in FZipLibrary documentation.

FZip 1.0.045 (06/22/2007)

Added support for Adobe Air. The Adobe Air runtime provides a low level deflate method, making it possible to load any ZIP archive and decompress compressed files without the need of injecting Adler32 checksums.
Bug fix: There was a problem with filenames containing special characters. Filename encoding now defaults to UTF-8. In case the filenames are encoded differently in your ZIP, you can specify the encoding in the FZip constructor.
Added FZipLibrary class for higher level access to files in a ZIP archive. FZipLibrary processes files (based on file extensions) from an FZip instance and converts them into usable formats. Files can be converted to either a BitmapData or DisplayObject classes. Data embedded in SWF files (like classes) can also be retrieved. Flash's built-in Loader class is used to convert formats, so the only formats currently supported are ones that Loader supports. As of this writing they are SWF, JPEG, GIF, and PNG.

FZip 1.0.029 (10/11/2006)

Initial Release.

License

FZip is released under the OSI approved zlib/libpng license.

Authors

Claus Wahlers and Max Herkender