refactor: split casino.go, dedup helpers, remove audit docs

1 files changed, 15 insertions, 0 deletions

diff --git a/internal/net/iac_test.go b/internal/net/iac_test.go
index 71570db..6f91f19 100644
--- a/internal/net/iac_test.go
+++ b/internal/net/iac_test.go
@@ -15,3 +15,18 @@ func TestStripIACDropsTruncatedSequence(t *testing.T) {
 		t.Fatalf("stripIAC(subnegotiation) = %q, want xy", got)
 	}
 }
+
+func TestStripIACPreservesInputAfterTwoByteCommand(t *testing.T) {
+	// A 2-byte command (NOP) in the middle must not eat the following byte.
+	if got := stripIAC("a" + string([]byte{iac, 0xf1}) + "b"); got != "ab" {
+		t.Fatalf("stripIAC(mid two-byte command) = %q, want %q", got, "ab")
+	}
+	// A 3-byte negotiation command consumes its option byte.
+	if got := stripIAC("a" + string([]byte{iac, will, echo}) + "b"); got != "ab" {
+		t.Fatalf("stripIAC(three-byte command) = %q, want %q", got, "ab")
+	}
+	// IAC IAC is an escaped literal 0xFF, not a command.
+	if got := stripIAC("a" + string([]byte{iac, iac}) + "b"); got != "a"+string([]byte{iac})+"b" {
+		t.Fatalf("stripIAC(escaped IAC) = %q, want literal 0xFF", got)
+	}
+}