/*

  * Copyright 2007-2008 The Kuali Foundation

  *

  * Licensed under the Educational Community License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  * http://www.opensource.org/licenses/ecl2.php

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.kuali.rice.kns.util.cache;

 import java.io.InputStream;

 /**

  * ByteArrayInputStream implementation that does not synchronize methods.

  */

 public class FastByteArrayInputStream extends InputStream {

     /**

      * Our byte buffer

      */

     protected byte[] buf = null;

     /**

      * Number of bytes that we can read from the buffer

      */

     protected int count = 0;

     /**

      * Number of bytes that have been read from the buffer

      */

     protected int pos = 0;

     public FastByteArrayInputStream(byte[] buf, int count) {

         this.buf = buf;

         this.count = count;

     }

     public final int available() {

         return count - pos;

     }

     public final int read() {

         return (pos < count) ? (buf[pos++] & 0xff) : -1;

     }

     public final int read(byte[] b, int off, int len) {

         if (pos >= count)

             return -1;

         if ((pos + len) > count)

             len = (count - pos);

         System.arraycopy(buf, pos, b, off, len);

         pos += len;

         return len;

     }

     public final long skip(long n) {

         if ((pos + n) > count)

             n = count - pos;

         if (n < 0)

             return 0;

         pos += n;

         return n;

     }

 }