Does this library support creating 7z archives?

[ArmaanMcleod]

I have been on the search for a .NET library which supports writing 7z archives, it seems that this library does not support it since I am getting Archive Type does not have a Writer: SevenZip errors.

Is this something that will be implemented in the future? I understand that 7z format is a lot more complex than other formats like ZIP and TAR.

Happy to help contribute as well 🙂.

[adamhathcock]

If this was a PR, I would accept it. But no, it currently doesn't support writing 7z files. It's an awful format, imo.

[ArmaanMcleod]

@adamhathcock Yep it sure is a strange format.

I managed to work around this using https://github.com/rikyoz/bit7z as a C++ wrapper then using native interop with C# P/Invoke.

I think to integrate it in in the sharpcompress library this wouldn't be an option since this wrapper uses 7z.dll.

If I get time, I'd be happy to try and build a native solution for this library, but I feel that would be a time-consuming exercise.

Do you have any thoughts on ideal approach here?

[adamhathcock]

Ideal approach? Not really. I'd suggest making a SevenZipWriter class first that writes headers and compresses the data like the ZipWriter then go for archive usage. The details of 7Zip are elusive to me though.

[adamhathcock]

This was started here #1229