applied patch from Adrian Pronk

https://issues.apache.org/jira/browse/SANDBOX-74



git-svn-id: https://svn.apache.org/repos/asf/commons/sandbox/compress/trunk@732342 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/java/org/apache/commons/compress/archivers/tar/TarInputStream.java b/src/main/java/org/apache/commons/compress/archivers/tar/TarInputStream.java
index e707aed..21e2551 100644
--- a/src/main/java/org/apache/commons/compress/archivers/tar/TarInputStream.java
+++ b/src/main/java/org/apache/commons/compress/archivers/tar/TarInputStream.java
@@ -302,7 +302,7 @@
         }
         else
         {
-            return (int)m_oneBuf[ 0 ];
+            return (int)m_oneBuf[ 0 ] & 0xFF;
         }
     }