XMLBEANS-481 - Base64 to byte[] is not very efficient

git-svn-id: https://svn.apache.org/repos/asf/xmlbeans/trunk@1890981 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/java/org/apache/xmlbeans/impl/values/JavaBase64Holder.java b/src/main/java/org/apache/xmlbeans/impl/values/JavaBase64Holder.java
index 8f254e1..b700d7e 100644
--- a/src/main/java/org/apache/xmlbeans/impl/values/JavaBase64Holder.java
+++ b/src/main/java/org/apache/xmlbeans/impl/values/JavaBase64Holder.java
@@ -23,7 +23,6 @@
 import org.apache.xmlbeans.impl.common.ValidationContext;
 import org.apache.xmlbeans.impl.schema.BuiltinSchemaTypeSystem;
 
-import java.nio.charset.StandardCharsets;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.util.Arrays;
@@ -59,8 +58,7 @@
 
     public static byte[] lex(String v, ValidationContext c) {
         try {
-            byte[] vBytes = v.getBytes(StandardCharsets.UTF_8);
-            return Base64.getDecoder().decode(vBytes);
+            return Base64.getDecoder().decode(v);
         } catch (IllegalArgumentException e) {
             // TODO - get a decent error with line numbers and such here
             c.invalid(XmlErrorCodes.BASE64BINARY, new Object[]{"not encoded properly"});