1. As Presented by Jim Kring April 1, 2003
LabVIEW Zip Tools
“A multi-platform Zip utility for LabVIEW”
As Presented by Jim Kring
April 1, 2003

2. OpenG User Group Meeting
Presentation Outline
Background
The shared library zlib wrapper
LabVIEW API
High-level VIs
Advanced (De)Compression VIs
Utility-level VIs and Shared Library API
String Compression
MacBinary Support
April 1, 2003
OpenG User Group Meeting

3. OpenG User Group Meeting
Background
LabVIEW Zip Tools is an OpenG Toolkit (OGTK) package 
Rolf Kalbermatter wrote the shared library wrapper around the zlib (de)compression library 
Chris Salzmann Compiled in Mac Classic & OS X and extended the shared library to support MacBinary Format.
lvzlib shared library compiled for Win32, Mac, Linux
April 1, 2003
OpenG User Group Meeting

4. OpenG User Group Meeting
Zlib 1.1.4
Open Source “freeware”
Adler-32 Error Checking (faster than CRC-32 but slightly more probabilty of false positive on random errors vs. 232 )
.zip file compatible
April 1, 2003
OpenG User Group Meeting

5. High-level LabVIEW API
Compress files and directories to an archive
Extract All files in an archive to a Dir
April 1, 2003
OpenG User Group Meeting

6. OpenG User Group Meeting
Advanced Compression
Open  Store  Store  …  Close
April 1, 2003
OpenG User Group Meeting

7. Advanced Decompression
Open, Extract, Close, and other File Indexing Operations
April 1, 2003
OpenG User Group Meeting

8. Utility and Shared Library Functions
Allow binary data (as opposed to files) to be written/read to/from the zip archive.
Other useful features that are abstracted from the high-level API.
April 1, 2003
OpenG User Group Meeting

9. OpenG User Group Meeting
String Compression
Operate on strings rather than files
Useful for compressing data that will be sent over TCP-IP and many other applications
This API is identical to that of a tool found on the NI DevZone
April 1, 2003
OpenG User Group Meeting

10. OpenG User Group Meeting
MacBinary Support
Macintosh file’s have a resource fork which stores metadata.
MacBinary encoding stores the file and its resource fork into a single file, so that it may be zipped.
OGPI will need this for OpenG Packages with Macintosh Files
April 1, 2003
OpenG User Group Meeting

11. OpenG User Group Meeting
Recap or
shared library wrapper for Zlib 1.1.4
LabVIEW API
High-level VIs
Advanced (De)Compression VIs
Utility-level VIs and Shared Library API
String Compression
MacBinary Support
Used By OGPI for (un)packing OpenG Package (.ogp) files
April 1, 2003
OpenG User Group Meeting