Support for seeking or continued file reading

[ohpauleez]

In the current implementation, it appears as though the file offset is always set to 0: https://github.com/bbeaupain/nio_uring/blob/main/src/main/c/liburing_provider.c#L239

I would like to continue reading large files with subsequent reads or seeking to a specific position within a known file and reading a specific number of bytes from that point. What are your thoughts on exposing a queueRead method that takes an offset argument to forward to prep_read?

(I'm happy to take some direction and make contributions)

[bbeaupain]

Great request! I think a good way to do this would be to:

• Modify the Java_sh_blake_niouring_IoUring_queueRead and Java_sh_blake_niouring_IoUring_queueWrite functions to accept an offset parameter (which then pass it to the io_uring call)
• Update the two existing queueRead and queueWrite methods to accept an offset parameter, which is passed to the native call, keeping the other logic intact
• Overload two new queueRead and queueWrite methods without an offset parameter (to not break the existing API), that simply call the other versions with an offset value of 0

A PR would be awesome if you're up to it! Otherwise I will try to get to this soon.

[ohpauleez]

I'm about to test this, but changes are sitting on this branch: https://github.com/ohpauleez/nio_uring/tree/queue_with_offset

Edit: Tested locally in a project that seeks across large files / datasets. Everything looks correct. Edit2: Included a unit test.

[bbeaupain]

Released on Maven Central as version 0.1.4, thank you for your contribution!