[AMQCPP-150] When performing tight unmarshalling of compressed long l…

…ong values (e.g. int and short), cast the values to unsigned, so that the sign bit will not appear in the resulting long

git-svn-id: https://svn.apache.org/repos/asf/activemq/activemq-cpp/trunk@589089 13f79535-47bb-0310-9956-ffa450edef68

src/main/activemq/connector/openwire/marshal/BaseDataStreamMarshaller.cpp

@@ -409,13 +409,13 @@ long long BaseDataStreamMarshaller::tightUnmarshalLong(
             if( bs->readBoolean() ) {
                 return dataIn->readLong();
             } else {
-                return dataIn->readInt();
+                return (unsigned int)dataIn->readInt();
             }
 
         } else {
 
             if( bs->readBoolean()) {
-                return dataIn->readShort();
+                return (unsigned short)dataIn->readShort();
             } else {
                 return 0;
             }