new server

models/writer.go

@@ -0,0 +1,49 @@
+package models
+
+import (
+	"encoding/binary"
+	"math"
+)
+
+type Writer struct {
+	buf []byte
+}
+
+func (w *Writer) Bytes() []byte {
+	return w.buf
+}
+
+func (w *Writer) WriteU8(v uint8) {
+	w.buf = append(w.buf, v)
+}
+
+func (w *Writer) WriteU16(v uint16) {
+	tmp := make([]byte, 2)
+	binary.LittleEndian.PutUint16(tmp, v)
+	w.buf = append(w.buf, tmp...)
+}
+
+func (w *Writer) WriteU32(v uint32) {
+	tmp := make([]byte, 4)
+	binary.LittleEndian.PutUint32(tmp, v)
+	w.buf = append(w.buf, tmp...)
+}
+
+func (w *Writer) WriteF32(v float32) {
+	tmp := make([]byte, 4)
+	binary.LittleEndian.PutUint32(tmp, math.Float32bits(v))
+	w.buf = append(w.buf, tmp...)
+}
+
+func (w *Writer) WriteBool(v bool) {
+	if v {
+		w.WriteU8(1)
+	} else {
+		w.WriteU8(0)
+	}
+}
+
+func (w *Writer) WriteString(s string) {
+	w.WriteU16(uint16(len(s)))
+	w.buf = append(w.buf, []byte(s)...)
+}