move all frames to separate package

frames/stop_waiting_frame.go

@@ -0,0 +1,41 @@
+package frames
+
+import (
+	"bytes"
+	"errors"
+
+	"github.com/lucas-clemente/quic-go/utils"
+)
+
+// A StopWaitingFrame in QUIC
+type StopWaitingFrame struct {
+	Entropy           byte
+	LeastUnackedDelta uint64
+}
+
+func (f *StopWaitingFrame) Write(b *bytes.Buffer) error {
+	return errors.New("StopWaitingFrame: Write not yet implemented")
+}
+
+// ParseStopWaitingFrame parses a StopWaiting frame
+func ParseStopWaitingFrame(r *bytes.Reader, packetNumberLen uint8) (*StopWaitingFrame, error) {
+	frame := &StopWaitingFrame{}
+
+	// read the TypeByte
+	_, err := r.ReadByte()
+	if err != nil {
+		return nil, err
+	}
+
+	frame.Entropy, err = r.ReadByte()
+	if err != nil {
+		return nil, err
+	}
+
+	frame.LeastUnackedDelta, err = utils.ReadUintN(r, packetNumberLen)
+	if err != nil {
+		return nil, err
+	}
+
+	return frame, nil
+}