feat(go): Port full Ananta private server to Go architecture

pkg/protocol/uxwriter.go

@@ -0,0 +1,127 @@
+package protocol
+
+import (
+	"bytes"
+	"encoding/binary"
+	"math"
+)
+
+type UxWriter struct {
+	buf bytes.Buffer
+}
+
+func NewUxWriter() *UxWriter {
+	return &UxWriter{}
+}
+
+func (w *UxWriter) U8(val byte) *UxWriter {
+	w.buf.WriteByte(val)
+	return w
+}
+
+func (w *UxWriter) Bool(val bool) *UxWriter {
+	if val {
+		w.buf.WriteByte(1)
+	} else {
+		w.buf.WriteByte(0)
+	}
+	return w
+}
+
+func (w *UxWriter) I16(val int16) *UxWriter {
+	var b [2]byte
+	binary.LittleEndian.PutUint16(b[:], uint16(val))
+	w.buf.Write(b[:])
+	return w
+}
+
+func (w *UxWriter) U16(val uint16) *UxWriter {
+	var b [2]byte
+	binary.LittleEndian.PutUint16(b[:], val)
+	w.buf.Write(b[:])
+	return w
+}
+
+func (w *UxWriter) I32(val int32) *UxWriter {
+	var b [4]byte
+	binary.LittleEndian.PutUint32(b[:], uint32(val))
+	w.buf.Write(b[:])
+	return w
+}
+
+func (w *UxWriter) U32(val uint32) *UxWriter {
+	var b [4]byte
+	binary.LittleEndian.PutUint32(b[:], val)
+	w.buf.Write(b[:])
+	return w
+}
+
+func (w *UxWriter) I64(val int64) *UxWriter {
+	var b [8]byte
+	binary.LittleEndian.PutUint64(b[:], uint64(val))
+	w.buf.Write(b[:])
+	return w
+}
+
+func (w *UxWriter) U64(val uint64) *UxWriter {
+	var b [8]byte
+	binary.LittleEndian.PutUint64(b[:], val)
+	w.buf.Write(b[:])
+	return w
+}
+
+func (w *UxWriter) F32(val float32) *UxWriter {
+	return w.U32(math.Float32bits(val))
+}
+
+func (w *UxWriter) F64(val float64) *UxWriter {
+	return w.U64(math.Float64bits(val))
+}
+
+func (w *UxWriter) WriteVarInt(val int) *UxWriter {
+	v := uint32(val)
+	for v >= 0x80 {
+		w.buf.WriteByte(byte(v | 0x80))
+		v >>= 7
+	}
+	w.buf.WriteByte(byte(v))
+	return w
+}
+
+func (w *UxWriter) Int7(val int) *UxWriter {
+	if val < 0 {
+		val = 0
+	}
+	return w.WriteVarInt(val + 1)
+}
+
+func (w *UxWriter) Raw7(val int) *UxWriter {
+	if val < 0 {
+		val = 0
+	}
+	return w.WriteVarInt(val)
+}
+
+func (w *UxWriter) UxString(str string) *UxWriter {
+	utf8 := []byte(str)
+	w.WriteVarInt(len(utf8) + 1)
+	w.buf.Write(utf8)
+	return w
+}
+
+func (w *UxWriter) UxStringNullable(str *string) *UxWriter {
+	if str == nil {
+		w.buf.WriteByte(0x00)
+		return w
+	}
+	return w.UxString(*str)
+}
+
+func (w *UxWriter) Raw(b []byte) *UxWriter {
+	w.buf.Write(b)
+	return w
+}
+
+func (w *UxWriter) Bytes() []byte {
+	return w.buf.Bytes()
+}