A few questions on parsing, sockets, UTF-8 strings

[john@peppermind.com]

Hi! For some non-standard interprocess communication, I need to:

1. Listen with a TCP socket to the local loopback interface and obtain the PORT suggested by the OS, i.e. like with bind() to port 0 and getsockname() in C. Is this possible with GNAT.sockets?

2. Connect to the incoming host and parse input and send output delimited by LF line-by-line. What about buffering, can it be switched off or is there a line buffer mode already? (It needs to be compatible with LF instead of CR+LF as delimiter, though.) 

3. Convert back and forth between Base64-encoded UTF-8 strings and UTF-8 strings (which may also be represented in the source text). How do I do this?

Especially the last point is a bit mysterious to me. I cannot use UCS-2, it needs to be full UTF-8. Should I use a library for UTF-8 strings? Which one? 

Speed is not very important, but I'd like to avoid unnecessary conversions.