New server framework, an example, and compressed packet fixed.

server/handshake.go

@@ -0,0 +1,22 @@
+package server
+
+import (
+	"github.com/Tnze/go-mc/net"
+	pk "github.com/Tnze/go-mc/net/packet"
+)
+
+func (s *Server) handshake(conn *net.Conn) (protocol int32, intention int32, err error) {
+	var (
+		Protocol, Intention pk.VarInt
+		ServerAddress       pk.String        // ignored
+		ServerPort          pk.UnsignedShort // ignored
+	)
+	// receive handshake packet
+	var p pk.Packet
+	err = conn.ReadPacket(&p)
+	if err != nil {
+		return 0, 0, err
+	}
+	err = p.Scan(&Protocol, &ServerAddress, &ServerPort, &Intention)
+	return int32(Protocol), int32(Intention), err
+}