added WriteVarSized/ReadVarSized

little/little.go

@@ -1370,3 +1370,20 @@ func EncodeZigZag(x int64) uint64 {
 func DecodeZigZag(u uint64) int64 {
 	return int64(u>>1) ^ -(int64(u & 1))
 }
+
+func WriteVarSized(w io.Writer, arr []byte) (err error) {
+	_, err = WriteVarSize(w, len(arr))
+	if err != nil {
+		return
+	}
+	_, err = w.Write(arr)
+	return
+}
+
+func ReadVarSized(src io.Reader) ([]byte, error) {
+	size, err := ReadVarSize(src)
+	if err != nil {
+		return nil, err
+	}
+	return ReadN(src, size)
+}