Skip ahead in buffer

[istvan-fodor]

Hi all,
I am pretty new to MCAP and I am trying to use the Rust binding. At the moment I use the mcap::MessageStream to read an MCAP file. I would like to be able to create an iterator that is long lived and can be used in a thread-safe manner, or instantiate new iterators every time I need a bacth of records but offset it by a number of already consumed messages / consumed bytes, etc.

The long-lived / thread-safe iterator looks unpractical because of movement issues (although I am pretty new to Rust, so maybe others know better). I saw that the internals mcap::MessageStream rely on bytes_remaining() so I was hoping there is a way to advance to the same point in a later batch.

Is there a proper way to do this right now? If not, are there fundamental concerns about implementing this? If not, I would probably take a stab at this myself and contribute back if I pull it off.

[istvan-fodor]

I think I can answer my own question. Summary::read along with Summary::stream_chunk(&[u8], summary.chunk_indexes.get(i)) is exactly what I was looking for