move framing creation into shared place

internal/framing/framer.go

@@ -1,7 +1,26 @@
 package framing
 
+import (
+	"fmt"
+)
+
 type Framer interface {
 	Decode([]byte) [][]byte
 	Encode([]byte) []byte
 	Clear()
 }
+
+func GetFramer(framingType string) (Framer, error) {
+	switch framingType {
+	case "CR":
+		return NewByteSeparatorFramer([]byte{'\r'}), nil
+	case "LF":
+		return NewByteSeparatorFramer([]byte{'\n'}), nil
+	case "CRLF":
+		return NewByteSeparatorFramer([]byte{'\r', '\n'}), nil
+	case "SLIP":
+		return NewSlipFramer(), nil
+	default:
+		return nil, fmt.Errorf("unknown framing method: %s", framingType)
+	}
+}