Replaced StringBuffer with StringBuilder

Author: krosenvold

src/main/java/org/codehaus/plexus/archiver/tar/TarInputStream.java

@@ -257,7 +257,7 @@ else if ( this.buffer.isEOFRecord( headerBuf ) )
         if ( this.currEntry != null && this.currEntry.isGNULongNameEntry() )
         {
             // read in the name
-            StringBuffer longName = new StringBuffer();
+            StringBuilder longName = new StringBuilder();
             byte[] buffer = new byte[256];
             int length;
             while ( ( length = read( buffer ) ) >= 0 )

src/test/java/org/codehaus/plexus/archiver/jar/IndexTest.java

@@ -114,7 +114,7 @@ public void testCreateArchiveWithIndexedJarsAndMetaInf()
         String res = new String(buf,0,i);
         //System.out.println(res);
 
-        StringBuffer expected = new StringBuffer();
+        StringBuilder expected = new StringBuilder();
         expected.append("JarIndex-Version: 1.0\n\n");
         expected.append("archive2.jar\ntwo.txt\n\n");
         expected.append("archive1.jar\nMETA-INF\none.txt\n\n");