[Mono-dev] Understanding ZipSharp and Native(Un)Zip - any MonoPosixHelper gurus?

[Alexander Köplinger]

I'm not really familiar with MonoPosixHelper, but it looks like on mobile it uses the "__Internal" P/Invoke:
 
https://github.com/mono/mono/blob/f39bebefeaa15cdde051d428f6bdc7e3e80b2c10/mcs/class/System/System.IO.Compression/DeflateStream.cs#L480-L484
 
Maybe that helps.
-- Alex
 
> From: maury.markowitz at gmail.com
> Date: Thu, 30 Oct 2014 10:05:50 -0400
> To: mono-devel-list at lists.ximian.com
> Subject: [Mono-dev] Understanding ZipSharp and Native(Un)Zip - any	MonoPosixHelper gurus?
> 
> I'm hoping someone familiar with MonoPosixHelper and/or WindowsBase will see this.
> 
> I am attempting to port System.IO.Package to iOS. I have made some progress, to the point where my somewhat stripped-down WindowsBase is compiling under Xamarin on the Mac, and I can run the Packaging functions to the point of decompressing the file.
> 
> Following through the code, this appears to ultimately fail on this:
> 
>        [DllImport ("MonoPosixHelper", CallingConvention=CallingConvention.Cdecl)]
>        static extern int unzOpenCurrentFile2 (UnzipHandle handle,
>                                               out int method,
>                                               out int level,
>                                               int raw);
> 
> Looking over MonoPosixHelper, it *appears* this consists largely of Zlib. Zlib is already installed on Mac/iOS in /usr/lib. So, in theory, P/Invoke should work given a few tweaks to the DllImport.
> 
> However, I cannot find any function called "unzOpenCurrentFile2" in MonoPosixHelper. I found some sort of mapping in WindowBase's IOFunctions.cs, but I'm not sure I understand it's purpose, nor if it is in any way related to this.
> 
> I can't shake the feeling that simply changing that DllImport is all I need, but I am too confused by the naming to be sure. Any pointers would be greatly appreciated!
> 
> p.s. My apologies if this double-posts, I got some sort of bounce message.
> 
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