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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache 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.apache.org/licenses/LICENSE-2.0
 *
 * 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.jboss.netty.buffer;

import java.nio.ByteOrder;


/**
 * A little-endian Java heap buffer.  It is recommended to use {@link ChannelBuffers#buffer(ByteOrder, int)}
 * and {@link ChannelBuffers#wrappedBuffer(ByteOrder, byte[])} instead of
 * calling the constructor explicitly.
 */
public class LittleEndianHeapChannelBuffer extends HeapChannelBuffer {

    /**
     * Creates a new little-endian heap buffer with a newly allocated byte array.
     *
     * @param length the length of the new byte array
     */
    public LittleEndianHeapChannelBuffer(int length) {
        super(length);
    }

    /**
     * Creates a new little-endian heap buffer with an existing byte array.
     *
     * @param array the byte array to wrap
     */
    public LittleEndianHeapChannelBuffer(byte[] array) {
        super(array);
    }

    private LittleEndianHeapChannelBuffer(byte[] array, int readerIndex, int writerIndex) {
        super(array, readerIndex, writerIndex);
    }

    public ChannelBufferFactory factory() {
        return HeapChannelBufferFactory.getInstance(ByteOrder.LITTLE_ENDIAN);
    }

    public ByteOrder order() {
        return ByteOrder.LITTLE_ENDIAN;
    }

    public short getShort(int index) {
        return (short) (array[index] & 0xFF | array[index + 1] << 8);
    }

    public int getUnsignedMedium(int index) {
        return array[index] & 0xff |
               (array[index + 1] & 0xff) <<  8 |
               (array[index + 2] & 0xff) << 16;
    }

    public int getInt(int index) {
        return array[index] & 0xff |
               (array[index + 1] & 0xff) <<  8 |
               (array[index + 2] & 0xff) << 16 |
               (array[index + 3] & 0xff) << 24;
    }

    public long getLong(int index) {
        return (long) array[index] & 0xff |
               ((long) array[index + 1] & 0xff) <<  8 |
               ((long) array[index + 2] & 0xff) << 16 |
               ((long) array[index + 3] & 0xff) << 24 |
               ((long) array[index + 4] & 0xff) << 32 |
               ((long) array[index + 5] & 0xff) << 40 |
               ((long) array[index + 6] & 0xff) << 48 |
               ((long) array[index + 7] & 0xff) << 56;
    }

    public void setShort(int index, int value) {
        array[index]     = (byte) value;
        array[index + 1] = (byte) (value >>> 8);
    }

    public void setMedium(int index, int   value) {
        array[index]     = (byte) value;
        array[index + 1] = (byte) (value >>> 8);
        array[index + 2] = (byte) (value >>> 16);
    }

    public void setInt(int index, int   value) {
        array[index]     = (byte) value;
        array[index + 1] = (byte) (value >>> 8);
        array[index + 2] = (byte) (value >>> 16);
        array[index + 3] = (byte) (value >>> 24);
    }

    public void setLong(int index, long  value) {
        array[index]     = (byte) value;
        array[index + 1] = (byte) (value >>> 8);
        array[index + 2] = (byte) (value >>> 16);
        array[index + 3] = (byte) (value >>> 24);
        array[index + 4] = (byte) (value >>> 32);
        array[index + 5] = (byte) (value >>> 40);
        array[index + 6] = (byte) (value >>> 48);
        array[index + 7] = (byte) (value >>> 56);
    }

    public ChannelBuffer duplicate() {
        return new LittleEndianHeapChannelBuffer(array, readerIndex(), writerIndex());
    }

    public ChannelBuffer copy(int index, int length) {
        if (index < 0 || length < 0 || index + length > array.length) {
            throw new IndexOutOfBoundsException("Too many bytes to copy - Need "
                    + (index + length) + ", maximum is " + array.length);
        }

        byte[] copiedArray = new byte[length];
        System.arraycopy(array, index, copiedArray, 0, length);
        return new LittleEndianHeapChannelBuffer(copiedArray);
    }
}