From 68de6c05a776b53cb5fcf4b7759039e22f6541a7 Mon Sep 17 00:00:00 2001
From: hedgecrw85 <will.hedgecock@fazecast.com>
Date: Wed, 3 Jan 2018 12:00:37 -0600
Subject: [PATCH] Ensure the InputStream read() function does not return
 0-length data

---
 src/main/java/com/fazecast/jSerialComm/SerialPort.java | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/main/java/com/fazecast/jSerialComm/SerialPort.java b/src/main/java/com/fazecast/jSerialComm/SerialPort.java
index f0375ab..56bafaf 100644
--- a/src/main/java/com/fazecast/jSerialComm/SerialPort.java
+++ b/src/main/java/com/fazecast/jSerialComm/SerialPort.java
@@ -1120,9 +1120,13 @@ public final class SerialPort
 				return 0;
 
 			byte[] buffer = new byte[len];
-			int numRead = readBytes(portHandle, buffer, len);
-			if (numRead > 0)
-				System.arraycopy(buffer, 0, b, off, numRead);
+			int numRead = 0;
+			while (isOpened && (numRead == 0))
+			{
+				numRead = readBytes(portHandle, buffer, len);
+				if (numRead > 0)
+					System.arraycopy(buffer, 0, buffer, off, numRead);
+			}
 
 			return numRead;
 		}