new server

models/reader.go

@@ -0,0 +1,50 @@
+package models
+
+import (
+	"encoding/binary"
+	"math"
+)
+
+type Reader struct {
+	buf []byte
+	off int
+}
+
+func NewReader(b []byte) *Reader {
+	return &Reader{buf: b}
+}
+
+func (r *Reader) ReadU8() uint8 {
+	v := r.buf[r.off]
+	r.off++
+	return v
+}
+
+func (r *Reader) ReadU16() uint16 {
+	v := binary.LittleEndian.Uint16(r.buf[r.off:])
+	r.off += 2
+	return v
+}
+
+func (r *Reader) ReadU32() uint32 {
+	v := binary.LittleEndian.Uint32(r.buf[r.off:])
+	r.off += 4
+	return v
+}
+
+func (r *Reader) ReadF32() float32 {
+	v := math.Float32frombits(binary.LittleEndian.Uint32(r.buf[r.off:]))
+	r.off += 4
+	return v
+}
+
+func (r *Reader) ReadBool() bool {
+	return r.ReadU8() == 1
+}
+
+func (r *Reader) ReadString() string {
+	l := r.ReadU16()
+	s := string(r.buf[r.off : r.off+int(l)])
+	r.off += int(l)
+	return s
+}