refactor multibuffer

proxy/http/server.go

@@ -185,8 +185,7 @@ func (s *Server) handleConnect(ctx context.Context, request *http.Request, reade
 	}
 
 	if reader.Buffered() > 0 {
-		var payload buf.MultiBuffer
-		_, err := payload.ReadFrom(&io.LimitedReader{R: reader, N: int64(reader.Buffered())})
+		payload, err := buf.ReadFrom(io.LimitReader(reader, int64(reader.Buffered())))
 		if err != nil {
 			return err
 		}

proxy/shadowsocks/ota.go

@@ -92,8 +92,7 @@ func (v *ChunkReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
 		return nil, newError("invalid auth")
 	}
 
-	var mb buf.MultiBuffer
-	common.Must2(mb.Write(payload))
+	mb := buf.MergeBytes(nil, payload)
 
 	return mb, nil
 }
@@ -117,7 +116,7 @@ func (w *ChunkWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
 	defer buf.ReleaseMulti(mb)
 
 	for {
-		payloadLen, _ := mb.Read(w.buffer[2+AuthSize:])
+		mb, payloadLen, _ := buf.SplitBytes(mb, w.buffer[2+AuthSize:])
 		binary.BigEndian.PutUint16(w.buffer, uint16(payloadLen))
 		w.auth.Authenticate(w.buffer[2+AuthSize:2+AuthSize+payloadLen], w.buffer[2:])
 		if err := buf.WriteAllBytes(w.writer, w.buffer[:2+AuthSize+payloadLen]); err != nil {