From 62a85e0392e48491d6a16bedca58ae71651ed116 Mon Sep 17 00:00:00 2001
From: Pavel Merzlyakov <panekmerzlyakov@gmail.com>
Date: Fri, 1 Sep 2023 01:37:06 +0300
Subject: [PATCH] read/write struct generic

---
 interface.go |  2 ++
 meta.go      | 40 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+)
 create mode 100644 meta.go

diff --git a/interface.go b/interface.go
index 952e712..42c4ba9 100644
--- a/interface.go
+++ b/interface.go
@@ -77,6 +77,8 @@ type Struct interface {
 	Writable
 }
 
+type StructFactory func(classId uint32) (Struct, error)
+
 type Bitmasked interface {
 	FieldChanged(index uint64) bool
 	SetFieldChanged(index uint64)
diff --git a/meta.go b/meta.go
new file mode 100644
index 0000000..8f84c57
--- /dev/null
+++ b/meta.go
@@ -0,0 +1,40 @@
+package meta
+
+func ReadStructGeneric(r Reader, createStruct StructFactory, field string) (Struct, error) {
+	if err := r.BeginContainer(field); err != nil {
+		return nil, err
+	}
+
+	var classId uint32
+	if err := r.ReadUint32(&classId, ""); err != nil {
+		return nil, err
+	}
+
+	s, err := createStruct(classId)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := s.Read(r); err != nil {
+		return nil, err
+	}
+
+	if err := r.EndContainer(); err != nil {
+		return nil, err
+	}
+
+	return s, nil
+}
+
+func WriteStructGeneric(w Writer, s Struct, field string) error {
+	if err := w.BeginCollection(2, field); err != nil {
+		return err
+	}
+	if err := w.WriteUint32(s.ClassId(), ""); err != nil {
+		return err
+	}
+	if err := s.Write(w); err != nil {
+		return err
+	}
+	return w.EndCollection()
+}