From 583f39e5227df84b05725ac6a4c4a3b2040eea83 Mon Sep 17 00:00:00 2001
From: ucwong <ucwong@126.com>
Date: Mon, 19 Jan 2026 06:35:06 +0800
Subject: [PATCH] improve SplitListValues allocation efficiency

---
 rlp/raw.go | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/rlp/raw.go b/rlp/raw.go
index a8c0bc3276..8d78ad6764 100644
--- a/rlp/raw.go
+++ b/rlp/raw.go
@@ -152,6 +152,40 @@ func CountValues(b []byte) (int, error) {
 	return i, nil
 }
 
+// SplitListValues extracts the raw elements from the list RLP-encoding blob.
+func SplitListValues(b []byte) ([][]byte, error) {
+	b, _, err := SplitList(b)
+	if err != nil {
+		return nil, err
+	}
+	n, err := CountValues(b)
+	if err != nil {
+		return nil, err
+	}
+	var elements = make([][]byte, 0, n)
+
+	for len(b) > 0 {
+		_, tagsize, size, err := readKind(b)
+		if err != nil {
+			return nil, err
+		}
+		elements = append(elements, b[:tagsize+size])
+		b = b[tagsize+size:]
+	}
+	return elements, nil
+}
+
+// MergeListValues takes a list of raw elements and rlp-encodes them as list.
+func MergeListValues(elems [][]byte) ([]byte, error) {
+	w := NewEncoderBuffer(nil)
+	offset := w.List()
+	for _, elem := range elems {
+		w.Write(elem)
+	}
+	w.ListEnd(offset)
+	return w.ToBytes(), nil
+}
+
 func readKind(buf []byte) (k Kind, tagsize, contentsize uint64, err error) {
 	if len(buf) == 0 {
 		return 0, 0, 0, io.ErrUnexpectedEOF