Hi all,

I am writing a class library in which I need to be able to unzip compressed
archives (i.e. ZIP or CAB files).

I want to do by accessing the file directly from my code, I do not want to
use any of the third party components that are available such as Xceed Zip.

Could anyone point me in the direction of where I can find technical
information on the structure and format of these files, how the data is
stored in them and how to extract it.

I am interested in any and all of the compression formats that are around
and would be very grateful for any pointers or info.

Regards,

Chris

This may help:

http://www.wotsit.org/

--
Joe Mayo - C# Station - http://www.csharp-station.com
Author:  C# Unleashed
http://www.amazon.com/exec/obidos/ASIN/067232122X/cstati

did you check licensing with this two? :
  http://www.organicbit.com/zip/
  http://www.icsharpcode.net/OpenSource/NZipLib