--- a/src/main/java/com/glavsoft/rfb/protocol/ReceiverTask.java	Thu Feb 06 22:29:23 2020 +0900
+++ b/src/main/java/com/glavsoft/rfb/protocol/ReceiverTask.java	Fri Feb 07 12:12:27 2020 +0900
@@ -385,18 +385,15 @@
             }
             in.readByte();
             int numberOfRectangeles = in.readInt16();
-
-            Reader checkReaderC1 = new Reader(new ByteArrayInputStream(c1.array()));
-            checkReaderC1.readByte();      // message ID
-            checkReaderC1.readByte();      // padding
-            checkReaderC1.readInt16();     // num of rectangle
-
-            FramebufferUpdateRectangle checkRect = new FramebufferUpdateRectangle();
-            checkRect.fill(checkReaderC1);
-            int length = checkRect.width * checkRect.height * renderer.getBytesPerPixel();
-            int zippedLength = (int) checkReaderC1.readUInt32();
-            byte[] unzipBytes = unzip(checkReaderC1, zippedLength, length, checkRect.getEncodingType());
-            CompairBytes(unzipBytes, checkBytes, flushOffset, flushEnd);
+            if (true) {
+                in.mark(c1.limit() - 4);
+                rect.fill(in);
+                int length = rect.width * rect.height * renderer.getBytesPerPixel();
+                int zippedLength = (int) in.readUInt32();
+                byte[] unzipBytes = unzip(in, zippedLength, length, rect.getEncodingType());
+                CompairBytes(unzipBytes, checkBytes, flushOffset, flushEnd);
+                in.reset();
+            }
             while (numberOfRectangeles-- > 0) {
                 rect.fill(in);
                 System.out.println("check rect " + rect);