BFNS: Trim whitespace from hosts.txt when importing

DataStructureImpl: Throw unique exception on bad base 64

core/java/src/net/i2p/client/naming/BlockfileNamingService.java

@@ -240,7 +240,7 @@ public class BlockfileNamingService extends DummyNamingService {
                             if (line.length() < split + 1)
                                 continue;
                         }
-                        String b64 = line.substring(split+1);   //.trim() ??????????????
+                        String b64 = line.substring(split+1).trim();
                         Destination d = lookupBase64(b64);
                         if (d != null) {
                             addEntry(rv, hostsfile, key, d, sourceMsg);

core/java/src/net/i2p/data/DataStructureImpl.java

@@ -37,6 +37,7 @@ public abstract class DataStructureImpl implements DataStructure, Serializable {
     public void fromBase64(String data) throws DataFormatException {
         if (data == null) throw new DataFormatException("Null data passed in");
         byte bytes[] = Base64.decode(data);
+        if (bytes == null) throw new DataFormatException("Bad Base64 \"" + data + '"');
         fromByteArray(bytes);
     }