read unsigned int method

Author: bosborn

src/main/java/mil/nga/sf/util/ByteReader.java

@@ -109,6 +109,17 @@ public int readInt() {
 		return value;
 	}
 
+	/**
+	 * Read an unsigned integer
+	 * 
+	 * @return unsigned integer
+	 */
+	public long readUnsignedInt() {
+		int intValue = readInt();
+		long value = intValue & 0xffffffffL;
+		return value;
+	}
+
 	/**
 	 * Read a double
 	 *