feat(quic): Phase C — long-header packets, frames, short-header packets
End-to-end packet codec for QUIC v1 packets:
- Long-header packet builder + parser (RFC 9000 §17.2) with packet-number
encoding, header protection (AES-ECB sample mask), and AEAD-GCM payload
protection. Initial packets carry the optional token field.
- Short-header (1-RTT) packet builder + parser with implicit DCID length.
- Stream reassembly buffer that coalesces out-of-order, overlapping chunks
into a contiguous prefix; consumed bytes are dropped, future overlaps
are deduplicated.
- Stream-id helpers (RFC 9000 §2.1) — client/server, bidi/uni discrimination.
- Frame codec for the minimal subset MoQ exercises: PADDING, PING, ACK,
ACK_ECN, CRYPTO, STREAM (all OFF/LEN/FIN flag combos), MAX_DATA,
MAX_STREAM_DATA, MAX_STREAMS, NEW_CONNECTION_ID, CONNECTION_CLOSE
(transport + app), HANDSHAKE_DONE, DATAGRAM (RFC 9221).
Round-trip test against RFC 9001 Appendix A.1's canonical client DCID
encrypts an Initial packet with the canonical protection material, then
decrypts it from the wire bit-for-bit. A wrong-key decrypt returns null
(silent drop per RFC 9001 §5.5). ReceiveBuffer reorders, deduplicates,
coalesces, and drops already-consumed prefixes correctly.
https://claude.ai/code/session_01EC1tfXfap8k8GyKvrxkxZx
Claude
ac53853057