ZIP file created with SharpZipLib cannot be opened on Mac OS X

Question

Argh, today is the day of stupid problems and me being an idiot.

I have an application which creates a zip file containing some JPEGs from a certain directory. I use th

Answer 1

I had a similar problem but on Windows 7. I updated to the as of this writing latest version of ICSharpZipLib 0.86.0.518. From then on I could no longer decompress any ZIP archives created with the code that was working so far.

There error messages were different depending on the tool I tried to extract with:

• Unknown compression method.
• Compressed size in local header does not match that of central directory header in new zip file.

What did the trick was to remove the CRC calculation as mentioned here: http://community.sharpdevelop.net/forums/t/8630.aspx

So I removed the line that is:

entry.Crc = crc.Value

And from then on I could again unzip the ZIP archives with any third party tool. I hope this helps someone.