From 27401b6ea459921a6152ab1744da1618358465f4 Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@lukeshu.com>
Date: Sun, 10 Jul 2022 13:18:30 -0600
Subject: Rename the module, mv pkg lib

---
 lib/binstruct/unmarshal.go | 54 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 lib/binstruct/unmarshal.go

(limited to 'lib/binstruct/unmarshal.go')

diff --git a/lib/binstruct/unmarshal.go b/lib/binstruct/unmarshal.go
new file mode 100644
index 0000000..1959d45
--- /dev/null
+++ b/lib/binstruct/unmarshal.go
@@ -0,0 +1,54 @@
+package binstruct
+
+import (
+	"fmt"
+	"reflect"
+)
+
+type Unmarshaler interface {
+	UnmarshalBinary([]byte) (int, error)
+}
+
+func Unmarshal(dat []byte, dstPtr any) (int, error) {
+	if unmar, ok := dstPtr.(Unmarshaler); ok {
+		return unmar.UnmarshalBinary(dat)
+	}
+	return UnmarshalWithoutInterface(dat, dstPtr)
+}
+
+func UnmarshalWithoutInterface(dat []byte, dstPtr any) (int, error) {
+	_dstPtr := reflect.ValueOf(dstPtr)
+	if _dstPtr.Kind() != reflect.Ptr {
+		return 0, fmt.Errorf("not a pointer: %v", _dstPtr.Type())
+	}
+	dst := _dstPtr.Elem()
+
+	switch dst.Kind() {
+	case reflect.Uint8, reflect.Int8, reflect.Uint16, reflect.Int16, reflect.Uint32, reflect.Int32, reflect.Uint64, reflect.Int64:
+		typ := intKind2Type[dst.Kind()]
+		newDstPtr := reflect.New(typ)
+		n, err := Unmarshal(dat, newDstPtr.Interface())
+		dst.Set(newDstPtr.Elem().Convert(dst.Type()))
+		return n, err
+	case reflect.Ptr:
+		elemPtr := reflect.New(dst.Type().Elem())
+		n, err := Unmarshal(dat, elemPtr.Interface())
+		dst.Set(elemPtr.Convert(dst.Type()))
+		return n, err
+	case reflect.Array:
+		var n int
+		for i := 0; i < dst.Len(); i++ {
+			_n, err := Unmarshal(dat[n:], dst.Index(i).Addr().Interface())
+			n += _n
+			if err != nil {
+				return n, err
+			}
+		}
+		return n, nil
+	case reflect.Struct:
+		return getStructHandler(dst.Type()).Unmarshal(dat, dst)
+	default:
+		panic(fmt.Errorf("type=%v does not implement binfmt.Unmarshaler and kind=%v is not a supported statically-sized kind",
+			dst.Type(), dst.Kind()))
+	}
+}
-- 
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