Add item DataComponent implements (part 1)

level/component/custommodeldata.go

@@ -0,0 +1,28 @@
+package component
+
+import (
+	"io"
+
+	pk "github.com/Tnze/go-mc/net/packet"
+)
+
+var _ DataComponent = (*CustomModelData)(nil)
+
+type CustomModelData struct {
+	Value pk.VarInt
+}
+
+// ID implements DataComponent.
+func (CustomModelData) ID() string {
+	return "minecraft:custom_model_data"
+}
+
+// ReadFrom implements DataComponent.
+func (c *CustomModelData) ReadFrom(r io.Reader) (n int64, err error) {
+	return c.Value.ReadFrom(r)
+}
+
+// WriteTo implements DataComponent.
+func (c *CustomModelData) WriteTo(w io.Writer) (n int64, err error) {
+	return c.Value.WriteTo(w)
+}