TcpEcho | Basic TCP server that uses System

I have frames that are delimited by bytes to start and stop the frame (they do not appear in the stream).

I read a chunk from disk or network socket, i then need to pass to a deserializer but only after I have de-framed the packet first.

Frames may span multiple chunks that have been read, note how frame 3 is split across array 1 and array 2.

Rather than reinvent the wheel for this common problem, do any github or similar projects exist?

I am investigating ReadOnlySequenceSegment from https://www.codemag.com/article/1807051/Introducing-.NET-Core-2.1-Flagship-Types-Span-T-and-Memory-T and will post updates as I work out the requirements.

Update

Further to Stephen Cleary link (thank you!!) to https://github.com/davidfowl/TcpEcho/blob/master/src/Server/Program.cs I have the below.

My data is json, so unlike the original question the delimiter tokens will appear in the stream. Therefore I have to count the array delimitator and only declare a frame when i have found the outermost [ and ] characters.

The below code works, and less manual copies done (not sure if still done behind the scenes - code is quite neater using David Fowl approach).

However I am casting to array instead of using buffer.PositionOf((byte)'[') since I was unable to see how I could call the PositionOf with an offset applied (i.e. scan deeper into the frame past previously found delimiter tokens).

Am i using/butchering the library in a brute force way, or is the below good to go with the array cast?