add replay reader and writer for handling tmcpr files

proto/replay/writer.go

@@ -0,0 +1,39 @@
+package replay
+
+import (
+	"bytes"
+	"encoding/binary"
+	"io"
+
+	"github.com/admin-else/strom/proto_base"
+)
+
+type Writer struct {
+	w io.Writer
+}
+
+func NewWriter(w io.Writer) *Writer {
+	return &Writer{w}
+}
+
+func (w *Writer) WriteRaw(p []byte, timestamp uint32) (err error) {
+	err = binary.Write(w.w, binary.BigEndian, timestamp)
+	if err != nil {
+		return
+	}
+	err = binary.Write(w.w, binary.BigEndian, uint32(len(p)))
+	if err != nil {
+		return
+	}
+	_, err = w.w.Write(p)
+	return
+}
+
+func (w *Writer) WritePacket(packet proto_base.EncodeDecodeAble, timestamp uint32) (err error) {
+	b := bytes.NewBuffer(nil)
+	err = packet.Encode(b)
+	if err != nil {
+		return
+	}
+	return w.WriteRaw(b.Bytes(), timestamp)
+}