BSD Commit Log Search

   Provide an extensible buffer implementation that uses a read callback.

   The read callback returns a TLS13_IO_* value on EOF, failure, want pollin
   or want pollout, or a positive value indicating the number of bytes read.

   This will be used by upcoming TLSv1.3 handshake message and record
   processing code, both of which need the ability to read a fixed size
   header, before extending the buffer to the number of bytes specified in the
   header.

   ok beck@ tb@

UnifiedSplitRaw