Add buffer.LenMulti

common/buf/buffer.go

@@ -321,18 +321,6 @@ func (b *Buffer) Release() {
 	*b = Buffer{closed: true}
 }
 
-func ReleaseMulti(buffers []*Buffer) {
-	for _, buffer := range buffers {
-		buffer.Release()
-	}
-}
-
-func ToSliceMulti(buffers []*Buffer) [][]byte {
-	return common.Map(buffers, func(it *Buffer) []byte {
-		return it.Bytes()
-	})
-}
-
 func (b *Buffer) Cut(start int, end int) *Buffer {
 	b.start += start
 	b.end = len(b.data) - end

common/buf/multi.go

@@ -0,0 +1,23 @@
+package buf
+
+import "github.com/sagernet/sing/common"
+
+func LenMulti(buffers []*Buffer) int {
+	var n int
+	for _, buffer := range buffers {
+		n += buffer.Len()
+	}
+	return n
+}
+
+func ToSliceMulti(buffers []*Buffer) [][]byte {
+	return common.Map(buffers, func(it *Buffer) []byte {
+		return it.Bytes()
+	})
+}
+
+func ReleaseMulti(buffers []*Buffer) {
+	for _, buffer := range buffers {
+		buffer.Release()
+	}
+}