Add get_token_info

[wiktor-k]

Okay folks, I'll need some more help on this one.

• I'm not sure where to place the TokenInfo struct (should it be in the -sys crate?)
• about the struct members themselves: for example currently they are raw types that are read from the PKCS#11 driver but maybe it would be nice to clean them up (e.g. all strings - as usual in PKCS#11 - are space padded - see the unit test).
• get_token_info uses some raw ffi code I found that works but I'm not sure if that's the best approach.

Please ignore placeholder docs for a moment. I'll add them when other issues are fixed :)

[ionut-arm]

I'm not sure where to place the TokenInfo struct (should it be in the -sys crate?)

I think the place where you put them is the right one. That file/module is supposed to cover section 3.2 Slot and token types of the spec

[wiktor-k]

Okay, I've vastly simplified the code when it occurred to me that CK_TOKEN_INFO generated by bindgen has already all members that I needed (btw is it possible somehow to see the code generated by bindgen? IDE doesn't see it just goes to macros :( ).

I've converted TokenInfo to be a wrapper around CK_TOKEN_INFO with accessor methods for properties that I use.

I've also added Deref and From implementations to be somehow similar to what you use with other types. (This can be used to access properties that don't have convenience accessor functions).

[ionut-arm]

btw is it possible somehow to see the code generated by bindgen? IDE doesn't see it just goes to macros :(

We already have bindings commited for a number of architectures, you can see them here - this is to have faster/easier builds on those platforms. Otherwise, you should be able to find them in something like ./target/debug/build/cryptoki-sys-.../out/cryptoki-sys-bindings.rs, if I remember correctly. Is this the code you meant?

[wiktor-k]

Is this the code you meant?

Yes! The builds for architectures are great for looking for what's available, thanks @ionut-arm! I didn't spot this previously.

[hug-dev]

Looks good 👌