View Javadoc

    1   /*
    2    * Copyright 2009 Red Hat, Inc.
    3    *
    4    * Red Hat licenses this file to you under the Apache License, version 2.0
    5    * (the "License"); you may not use this file except in compliance with the
    6    * License.  You may obtain a copy of the License at:
    7    *
    8    *    http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
    12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
    13   * License for the specific language governing permissions and limitations
    14   * under the License.
    15   */
    16  package org.jboss.netty.buffer;
    17
    18  import java.nio.ByteOrder;
    19
    20
    21  /**
    22   * A big-endian Java heap buffer.  It is recommended to use {@link ChannelBuffers#buffer(int)}
    23   * and {@link ChannelBuffers#wrappedBuffer(byte[])} instead of calling the
    24   * constructor explicitly.
    25   *
    26   * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
    27   * @author <a href="http://gleamynode.net/">Trustin Lee</a>
    28   *
    29   * @version $Rev: 2206 $, $Date: 2010-03-03 14:35:01 +0900 (Wed, 03 Mar 2010) $
    30   */
    31  public class BigEndianHeapChannelBuffer extends HeapChannelBuffer {
    32
    33      /**
    34       * Creates a new big-endian heap buffer with a newly allocated byte array.
    35       *
    36       * @param length the length of the new byte array
    37       */
    38      public BigEndianHeapChannelBuffer(int length) {
    39          super(length);
    40      }
    41
    42      /**
    43       * Creates a new big-endian heap buffer with an existing byte array.
    44       *
    45       * @param array the byte array to wrap
    46       */
    47      public BigEndianHeapChannelBuffer(byte[] array) {
    48          super(array);
    49      }
    50
    51      private BigEndianHeapChannelBuffer(byte[] array, int readerIndex, int writerIndex) {
    52          super(array, readerIndex, writerIndex);
    53      }
    54
    55      public ChannelBufferFactory factory() {
    56          return HeapChannelBufferFactory.getInstance(ByteOrder.BIG_ENDIAN);
    57      }
    58
    59      public ByteOrder order() {
    60          return ByteOrder.BIG_ENDIAN;
    61      }
    62
    63      public short getShort(int index) {
    64          return (short) (array[index] << 8 | array[index+1] & 0xFF);
    65      }
    66
    67      public int getUnsignedMedium(int index) {
    68          return  (array[index]   & 0xff) << 16 |
    69                  (array[index+1] & 0xff) <<  8 |
    70                  (array[index+2] & 0xff) <<  0;
    71      }
    72
    73      public int getInt(int index) {
    74          return  (array[index]   & 0xff) << 24 |
    75                  (array[index+1] & 0xff) << 16 |
    76                  (array[index+2] & 0xff) <<  8 |
    77                  (array[index+3] & 0xff) <<  0;
    78      }
    79
    80      public long getLong(int index) {
    81          return  ((long) array[index]   & 0xff) << 56 |
    82                  ((long) array[index+1] & 0xff) << 48 |
    83                  ((long) array[index+2] & 0xff) << 40 |
    84                  ((long) array[index+3] & 0xff) << 32 |
    85                  ((long) array[index+4] & 0xff) << 24 |
    86                  ((long) array[index+5] & 0xff) << 16 |
    87                  ((long) array[index+6] & 0xff) <<  8 |
    88                  ((long) array[index+7] & 0xff) <<  0;
    89      }
    90
    91      public void setShort(int index, int value) {
    92          array[index  ] = (byte) (value >>> 8);
    93          array[index+1] = (byte) (value >>> 0);
    94      }
    95
    96      public void setMedium(int index, int   value) {
    97          array[index  ] = (byte) (value >>> 16);
    98          array[index+1] = (byte) (value >>> 8);
    99          array[index+2] = (byte) (value >>> 0);
    100     }
    101
    102     public void setInt(int index, int   value) {
    103         array[index  ] = (byte) (value >>> 24);
    104         array[index+1] = (byte) (value >>> 16);
    105         array[index+2] = (byte) (value >>> 8);
    106         array[index+3] = (byte) (value >>> 0);
    107     }
    108
    109     public void setLong(int index, long  value) {
    110         array[index  ] = (byte) (value >>> 56);
    111         array[index+1] = (byte) (value >>> 48);
    112         array[index+2] = (byte) (value >>> 40);
    113         array[index+3] = (byte) (value >>> 32);
    114         array[index+4] = (byte) (value >>> 24);
    115         array[index+5] = (byte) (value >>> 16);
    116         array[index+6] = (byte) (value >>> 8);
    117         array[index+7] = (byte) (value >>> 0);
    118     }
    119
    120     public ChannelBuffer duplicate() {
    121         return new BigEndianHeapChannelBuffer(array, readerIndex(), writerIndex());
    122     }
    123
    124     public ChannelBuffer copy(int index, int length) {
    125         if (index < 0 || length < 0 || index + length > array.length) {
    126             throw new IndexOutOfBoundsException();
    127         }
    128
    129         byte[] copiedArray = new byte[length];
    130         System.arraycopy(array, index, copiedArray, 0, length);
    131         return new BigEndianHeapChannelBuffer(copiedArray);
    132     }
    133 }