Decompress GZIP Internally

[Inuyasha1782]

Does anyone know if it's possible to decompress GZIP internally in VB? I have been doing it via another EXE compiled in a different language because I can't find a good method internally. Thanks for the help.

[ganeshmoorthy]

what is gzip. if a zip file the you can try using zip.dll and unzip.dll files...try google

[Vegeta]

gzip is short for GNU zip. Its similar to zip but not as portable. gzip is used to compress HTTP streams.

Inuyasha1782:

I hab this problem once, when coding a webserver that supports gzip. Due to a lot of work, i gave it up.
You may have a look to http://www.gzip.org/#sources.
Download the Source. In algorithm.doc the file format and the compression methods are described.

[Inuyasha1782]

So no one has ever made a VB function to correctly decompress a Gzip compressed file? I'm learning ++ right now, closely related to C, but translating something like that would take forever.

[Inuyasha1782]

I take it no one has a clue? <_<

[Vegeta]

maybe you find some library or vbcode somewhere if you google for it.
the last thing you can do is to code the algorithm yourself.

[idolpx]

I take it no one has a clue?

Now there's no reason to be rude.

GZip is actually just Deflate with a special header.

The zlib library contains functions for doing Deflate with or without a gzip or zlib header.

http://www.zlib.net/

I made a few modifications to the zlib DLL to make the compress and uncompress functions easier to use. (You can now specify the mode of the data when calling the function.) And I wrote a VB Class wrapper because I couldn't find anything else out there to compress/uncompress gzip data in memory.

Hope this helps.