--- a/jdk/src/share/classes/com/sun/org/apache/xml/internal/security/utils/UnsyncByteArrayOutputStream.java	Fri Oct 15 12:10:32 2010 +0100
+++ b/jdk/src/share/classes/com/sun/org/apache/xml/internal/security/utils/UnsyncByteArrayOutputStream.java	Fri Oct 15 10:55:59 2010 -0400
@@ -3,7 +3,7 @@
  * DO NOT REMOVE OR ALTER!
  */
 /*
- * Copyright  1999-2005 The Apache Software Foundation.
+ * Copyright 1999-2010 The Apache Software Foundation.
  *
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -23,66 +23,70 @@
 import java.io.OutputStream;
 
 /**
- * A simple Unsynced ByteArryOutputStream
+ * A simple Unsynced ByteArrayOutputStream
  * @author raul
  *
  */
 public class UnsyncByteArrayOutputStream extends OutputStream  {
-        private static ThreadLocal bufCahce = new ThreadLocal() {
+    private static final int INITIAL_SIZE = 8192;
+    private static ThreadLocal bufCache = new ThreadLocal() {
         protected synchronized Object initialValue() {
-            return new byte[8*1024];
+            return new byte[INITIAL_SIZE];
         }
     };
-    byte[] buf;
-        int size=8*1024;//buf.length;
-        int pos=0;
-        public UnsyncByteArrayOutputStream() {
-                buf=(byte[])bufCahce.get();
+
+    private byte[] buf;
+    private int size = INITIAL_SIZE;
+    private int pos = 0;
+
+    public UnsyncByteArrayOutputStream() {
+        buf = (byte[])bufCache.get();
+    }
+
+    public void write(byte[] arg0) {
+        int newPos = pos + arg0.length;
+        if (newPos > size) {
+            expandSize(newPos);
         }
-        /** @inheritDoc */
-        public void write(byte[] arg0) {
-                int newPos=pos+arg0.length;
-                if (newPos>size) {
-                        expandSize();
-                }
-                System.arraycopy(arg0,0,buf,pos,arg0.length);
-                pos=newPos;
-        }
-        /** @inheritDoc */
-        public void write(byte[] arg0, int arg1, int arg2) {
-                int newPos=pos+arg2;
-                if (newPos>size) {
-                        expandSize();
-                }
-                System.arraycopy(arg0,arg1,buf,pos,arg2);
-                pos=newPos;
+        System.arraycopy(arg0, 0, buf, pos, arg0.length);
+        pos = newPos;
+    }
+
+    public void write(byte[] arg0, int arg1, int arg2) {
+        int newPos = pos + arg2;
+        if (newPos > size) {
+            expandSize(newPos);
         }
-        /** @inheritDoc */
-        public void write(int arg0) {
-                if (pos>=size) {
-                        expandSize();
-                }
-                buf[pos++]=(byte)arg0;
+        System.arraycopy(arg0, arg1, buf, pos, arg2);
+        pos = newPos;
+    }
+
+    public void write(int arg0) {
+        int newPos = pos + 1;
+        if (newPos > size) {
+            expandSize(newPos);
         }
-        /** @inheritDoc */
-        public byte[] toByteArray() {
-                byte result[]=new byte[pos];
-                System.arraycopy(buf,0,result,0,pos);
-                return result;
-        }
+        buf[pos++] = (byte)arg0;
+    }
 
-        /** @inheritDoc */
-        public void reset() {
-                pos=0;
-        }
+    public byte[] toByteArray() {
+        byte result[] = new byte[pos];
+        System.arraycopy(buf, 0, result, 0, pos);
+        return result;
+    }
+
+    public void reset() {
+        pos = 0;
+    }
 
-        /** @inheritDoc */
-        void expandSize() {
-                int newSize=size<<2;
-                byte newBuf[]=new byte[newSize];
-                System.arraycopy(buf,0,newBuf,0,pos);
-                buf=newBuf;
-                size=newSize;
-
+    private void expandSize(int newPos) {
+        int newSize = size;
+        while (newPos > newSize) {
+            newSize = newSize<<2;
         }
+        byte newBuf[] = new byte[newSize];
+        System.arraycopy(buf, 0, newBuf, 0, pos);
+        buf = newBuf;
+        size = newSize;
+    }
 }

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/com/sun/org/apache/xml/internal/security/utils/UnsyncByteArrayOutputStream/BufferOverflowTest.java	Fri Oct 15 10:55:59 2010 -0400
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * @test %I% %E%
+ * @bug 6954275
+ * @summary Check that UnsyncByteArrayOutputStream does not
+ *          throw ArrayIndexOutOfBoundsException
+ * @compile -XDignore.symbol.file BufferOverflowTest.java
+ * @run main BufferOverflowTest
+ */
+
+import com.sun.org.apache.xml.internal.security.utils.UnsyncByteArrayOutputStream;
+
+public class BufferOverflowTest {
+
+    public static void main(String[] args) throws Exception {
+        try {
+            UnsyncByteArrayOutputStream out = new UnsyncByteArrayOutputStream();
+            out.write(new byte[(8192) << 2 + 1]);
+            System.out.println("PASSED");
+        } catch (ArrayIndexOutOfBoundsException e) {
+            System.err.println("FAILED, got ArrayIndexOutOfBoundsException");
+            throw new Exception(e);
+        }
+    }
+}