[sean0407]

Summary

• Serialize the IPv4 and IPv6 Preferred Address ports as two-byte big-endian values.
• Add a regression test that round-trips a 41-byte Preferred Address containing nonzero port bytes.

Evidence

Issue #248 reports that PreferredAddress.serialize() emits each 16-bit port as one byte, producing a 39-byte result instead of 41 bytes. The new regression test reproduced that exact 41-versus-39 failure before the fix and passes with the corrected encoding.

Changed files:

• TLS-Core/src/main/java/de/rub/nds/tlsattacker/core/protocol/message/extension/quic/QuicTransportParametersExtensionMessage.java
• TLS-Core/src/test/java/de/rub/nds/tlsattacker/core/protocol/message/extension/quic/QuicTransportParameterTest.java

Checks:

• Isolated Docker Maven run: mvn -o -B -Dstyle.color=never -pl TLS-Core -am -Dtest=QuicTransportParameterTest -Dsurefire.failIfNoSpecifiedTests=false test — passed, 3 tests.
• git diff --check — passed.
• scripts/patch_policy.py — accepted 2 files, 18 changed lines, no binary changes.

Fixes #248

Merge Danger

Door: two-way

Blast Radius: localized to QUIC Preferred Address serialization.