refactor package

pkg/protocol/slot/trade_item.go

@@ -0,0 +1,41 @@
+package slot
+
+import (
+	"io"
+
+	pk "github.com/Tnze/go-mc/net/packet"
+)
+
+type TradeSlot struct {
+	ID         int32
+	Count      int32
+	Components []Component
+}
+
+func (t TradeSlot) WriteTo(w io.Writer) (n int64, err error) {
+	pk.VarInt(t.ID).WriteTo(w)
+	pk.VarInt(t.Count).WriteTo(w)
+	pk.VarInt(len(t.Components)).WriteTo(w)
+	for _, component := range t.Components {
+		pk.VarInt(component.Type()).WriteTo(w)
+		component.WriteTo(w)
+	}
+	return
+}
+
+func (t *TradeSlot) ReadFrom(r io.Reader) (n int64, err error) {
+	(*pk.VarInt)(&t.ID).ReadFrom(r)
+	(*pk.VarInt)(&t.Count).ReadFrom(r)
+	var lens pk.VarInt
+	lens.ReadFrom(r)
+	t.Components = make([]Component, lens)
+	for i := range t.Components {
+		var id pk.VarInt
+		id.ReadFrom(r)
+		c := ComponentFromID(ComponentID(id))
+		c.ReadFrom(r)
+		t.Components[i] = c
+	}
+
+	return
+}