Add hex decoding support

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1625289 13f79535-47bb-0310-9956-ffa450edef68
Fix formatting

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1625290 13f79535-47bb-0310-9956-ffa450edef68