2008-08-08 02:37:18 +02:00
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/*
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2012-06-04 22:31:44 +02:00
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* Copyright 2012 The Netty Project
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2008-08-08 02:37:18 +02:00
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*
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2011-12-09 06:18:34 +01:00
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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2008-08-08 02:37:18 +02:00
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*
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2012-06-04 22:31:44 +02:00
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* http://www.apache.org/licenses/LICENSE-2.0
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2008-08-08 03:27:24 +02:00
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*
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2009-08-28 09:15:49 +02:00
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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2011-12-09 06:18:34 +01:00
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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2009-08-28 09:15:49 +02:00
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* License for the specific language governing permissions and limitations
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* under the License.
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2008-08-08 02:37:18 +02:00
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*/
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2011-12-09 04:38:59 +01:00
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package io.netty.buffer;
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2008-08-08 02:37:18 +02:00
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.nio.ByteBuffer;
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2012-06-11 13:24:44 +02:00
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import java.nio.ByteOrder;
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2008-11-16 14:52:47 +01:00
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import java.nio.channels.ClosedChannelException;
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2008-08-08 02:37:18 +02:00
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import java.nio.channels.GatheringByteChannel;
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import java.nio.channels.ScatteringByteChannel;
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/**
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2012-06-11 13:24:44 +02:00
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* Big endian Java heap buffer implementation.
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2008-08-08 02:37:18 +02:00
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*/
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2012-06-11 13:24:44 +02:00
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public class HeapByteBuf extends AbstractByteBuf {
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2008-08-08 02:37:18 +02:00
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2012-07-19 13:23:55 +02:00
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private final Unsafe unsafe = new HeapUnsafe();
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2008-08-08 02:37:18 +02:00
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2012-07-19 13:23:55 +02:00
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private byte[] array;
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private ByteBuffer nioBuf;
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2012-05-25 15:10:10 +02:00
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2008-09-02 09:13:20 +02:00
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/**
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* Creates a new heap buffer with a newly allocated byte array.
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*
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2012-07-19 13:23:55 +02:00
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* @param initialCapacity the initial capacity of the underlying byte array
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* @param maxCapacity the max capacity of the underlying byte array
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2008-09-02 09:13:20 +02:00
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*/
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2012-07-19 13:23:55 +02:00
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public HeapByteBuf(int initialCapacity, int maxCapacity) {
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this(new byte[initialCapacity], 0, 0, maxCapacity);
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2008-08-08 02:37:18 +02:00
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}
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2008-09-02 09:13:20 +02:00
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/**
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* Creates a new heap buffer with an existing byte array.
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*
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2012-07-19 13:23:55 +02:00
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* @param initialArray the initial underlying byte array
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* @param maxCapacity the max capacity of the underlying byte array
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2008-09-02 09:13:20 +02:00
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*/
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2012-07-19 13:23:55 +02:00
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public HeapByteBuf(byte[] initialArray, int maxCapacity) {
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this(initialArray, 0, initialArray.length, maxCapacity);
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2008-08-08 02:37:18 +02:00
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}
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2012-07-19 13:23:55 +02:00
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private HeapByteBuf(byte[] initialArray, int readerIndex, int writerIndex, int maxCapacity) {
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super(ByteOrder.BIG_ENDIAN, maxCapacity);
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if (initialArray == null) {
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throw new NullPointerException("initialArray");
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2008-08-08 02:37:18 +02:00
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}
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2012-07-19 13:23:55 +02:00
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if (initialArray.length > maxCapacity) {
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throw new IllegalArgumentException(String.format(
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"initialCapacity(%d) > maxCapacity(%d)", initialArray.length, maxCapacity));
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}
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setArray(initialArray);
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2008-08-08 02:37:18 +02:00
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setIndex(readerIndex, writerIndex);
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2012-07-19 13:23:55 +02:00
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}
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private void setArray(byte[] initialArray) {
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array = initialArray;
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nioBuf = ByteBuffer.wrap(initialArray);
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2008-08-08 02:37:18 +02:00
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}
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2010-11-12 01:45:39 +01:00
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@Override
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2010-01-27 06:07:32 +01:00
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public boolean isDirect() {
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return false;
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}
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2010-11-12 01:45:39 +01:00
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@Override
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2008-08-08 02:37:18 +02:00
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public int capacity() {
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return array.length;
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}
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2012-07-19 13:23:55 +02:00
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@Override
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public void capacity(int newCapacity) {
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if (newCapacity < 0 || newCapacity > maxCapacity()) {
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throw new IllegalArgumentException("newCapacity: " + newCapacity);
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}
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int oldCapacity = array.length;
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if (newCapacity > oldCapacity) {
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byte[] newArray = new byte[newCapacity];
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System.arraycopy(array, readerIndex(), newArray, readerIndex(), readableBytes());
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setArray(newArray);
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} else if (newCapacity < oldCapacity) {
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byte[] newArray = new byte[newCapacity];
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int readerIndex = readerIndex();
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if (readerIndex < newCapacity) {
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int writerIndex = writerIndex();
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if (writerIndex > newCapacity) {
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writerIndex(writerIndex = newCapacity);
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}
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System.arraycopy(array, readerIndex, newArray, readerIndex, writerIndex - readerIndex);
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}
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setArray(newArray);
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}
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}
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2010-11-12 01:45:39 +01:00
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@Override
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2009-11-25 08:08:52 +01:00
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public boolean hasArray() {
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return true;
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}
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2010-11-12 01:45:39 +01:00
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@Override
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2009-11-25 08:08:52 +01:00
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public byte[] array() {
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return array;
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}
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2010-11-12 01:45:39 +01:00
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@Override
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2009-11-25 08:08:52 +01:00
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public int arrayOffset() {
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return 0;
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}
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2010-11-12 01:45:39 +01:00
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@Override
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2008-08-08 02:37:18 +02:00
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public byte getByte(int index) {
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return array[index];
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}
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2010-11-12 01:45:39 +01:00
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@Override
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2012-06-10 04:08:43 +02:00
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public void getBytes(int index, ByteBuf dst, int dstIndex, int length) {
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if (dst instanceof HeapByteBuf) {
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getBytes(index, ((HeapByteBuf) dst).array, dstIndex, length);
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2008-08-08 02:37:18 +02:00
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} else {
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dst.setBytes(dstIndex, array, index, length);
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}
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}
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2010-11-12 01:45:39 +01:00
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@Override
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2008-08-08 02:37:18 +02:00
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public void getBytes(int index, byte[] dst, int dstIndex, int length) {
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System.arraycopy(array, index, dst, dstIndex, length);
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}
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2010-11-12 01:45:39 +01:00
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@Override
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2008-08-08 02:37:18 +02:00
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public void getBytes(int index, ByteBuffer dst) {
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dst.put(array, index, Math.min(capacity() - index, dst.remaining()));
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}
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2010-11-12 01:45:39 +01:00
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@Override
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2008-08-08 02:37:18 +02:00
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public void getBytes(int index, OutputStream out, int length)
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throws IOException {
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out.write(array, index, length);
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}
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2010-11-12 01:45:39 +01:00
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@Override
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2008-08-08 02:37:18 +02:00
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public int getBytes(int index, GatheringByteChannel out, int length)
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throws IOException {
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2012-05-25 15:10:10 +02:00
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return out.write((ByteBuffer) nioBuf.clear().position(index).limit(index + length));
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2008-08-08 02:37:18 +02:00
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}
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2010-11-12 01:45:39 +01:00
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@Override
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2010-03-03 06:35:01 +01:00
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public void setByte(int index, int value) {
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array[index] = (byte) value;
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2008-08-08 02:37:18 +02:00
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}
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2010-11-12 01:45:39 +01:00
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@Override
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2012-06-10 04:08:43 +02:00
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public void setBytes(int index, ByteBuf src, int srcIndex, int length) {
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if (src instanceof HeapByteBuf) {
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setBytes(index, ((HeapByteBuf) src).array, srcIndex, length);
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2008-08-08 02:37:18 +02:00
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} else {
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src.getBytes(srcIndex, array, index, length);
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}
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}
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2010-11-12 01:45:39 +01:00
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@Override
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2008-08-08 02:37:18 +02:00
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public void setBytes(int index, byte[] src, int srcIndex, int length) {
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System.arraycopy(src, srcIndex, array, index, length);
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}
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2010-11-12 01:45:39 +01:00
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@Override
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2008-08-08 02:37:18 +02:00
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public void setBytes(int index, ByteBuffer src) {
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src.get(array, index, src.remaining());
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}
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2010-11-12 01:45:39 +01:00
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@Override
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2008-08-20 05:09:23 +02:00
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public int setBytes(int index, InputStream in, int length) throws IOException {
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2012-05-25 22:58:56 +02:00
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return in.read(array, index, length);
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2008-08-08 02:37:18 +02:00
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}
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2010-11-12 01:45:39 +01:00
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@Override
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2008-08-08 02:37:18 +02:00
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public int setBytes(int index, ScatteringByteChannel in, int length) throws IOException {
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2012-05-25 15:10:10 +02:00
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try {
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return in.read((ByteBuffer) nioBuf.clear().position(index).limit(index + length));
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} catch (ClosedChannelException e) {
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return -1;
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}
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2008-08-08 02:37:18 +02:00
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}
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2010-11-12 01:45:39 +01:00
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@Override
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2012-06-02 10:30:55 +02:00
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public boolean hasNioBuffer() {
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return true;
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}
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@Override
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public ByteBuffer nioBuffer(int index, int length) {
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2012-07-19 13:23:55 +02:00
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return ByteBuffer.wrap(array, index, length);
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2012-06-11 13:24:44 +02:00
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}
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@Override
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public short getShort(int index) {
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return (short) (array[index] << 8 | array[index + 1] & 0xFF);
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}
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@Override
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public int getUnsignedMedium(int index) {
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return (array[index] & 0xff) << 16 |
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(array[index + 1] & 0xff) << 8 |
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(array[index + 2] & 0xff) << 0;
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}
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@Override
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public int getInt(int index) {
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return (array[index] & 0xff) << 24 |
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(array[index + 1] & 0xff) << 16 |
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(array[index + 2] & 0xff) << 8 |
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(array[index + 3] & 0xff) << 0;
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}
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@Override
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public long getLong(int index) {
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return ((long) array[index] & 0xff) << 56 |
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((long) array[index + 1] & 0xff) << 48 |
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((long) array[index + 2] & 0xff) << 40 |
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((long) array[index + 3] & 0xff) << 32 |
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((long) array[index + 4] & 0xff) << 24 |
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((long) array[index + 5] & 0xff) << 16 |
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((long) array[index + 6] & 0xff) << 8 |
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((long) array[index + 7] & 0xff) << 0;
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}
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@Override
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public void setShort(int index, int value) {
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array[index] = (byte) (value >>> 8);
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array[index + 1] = (byte) (value >>> 0);
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}
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@Override
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public void setMedium(int index, int value) {
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array[index] = (byte) (value >>> 16);
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array[index + 1] = (byte) (value >>> 8);
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array[index + 2] = (byte) (value >>> 0);
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}
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@Override
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public void setInt(int index, int value) {
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array[index] = (byte) (value >>> 24);
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array[index + 1] = (byte) (value >>> 16);
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array[index + 2] = (byte) (value >>> 8);
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array[index + 3] = (byte) (value >>> 0);
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}
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@Override
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public void setLong(int index, long value) {
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array[index] = (byte) (value >>> 56);
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array[index + 1] = (byte) (value >>> 48);
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array[index + 2] = (byte) (value >>> 40);
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array[index + 3] = (byte) (value >>> 32);
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array[index + 4] = (byte) (value >>> 24);
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array[index + 5] = (byte) (value >>> 16);
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array[index + 6] = (byte) (value >>> 8);
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array[index + 7] = (byte) (value >>> 0);
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}
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@Override
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public ByteBuf copy(int index, int length) {
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if (index < 0 || length < 0 || index + length > array.length) {
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throw new IndexOutOfBoundsException("Too many bytes to copy - Need "
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+ (index + length) + ", maximum is " + array.length);
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}
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byte[] copiedArray = new byte[length];
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System.arraycopy(array, index, copiedArray, 0, length);
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2012-07-19 13:23:55 +02:00
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return new HeapByteBuf(copiedArray, maxCapacity());
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}
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@Override
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public Unsafe unsafe() {
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return unsafe;
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}
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private class HeapUnsafe implements Unsafe {
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@Override
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public ByteBuffer nioBuffer() {
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return nioBuf;
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}
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@Override
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public ByteBuf newBuffer(int initialCapacity) {
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return new HeapByteBuf(initialCapacity, Math.max(initialCapacity, maxCapacity()));
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}
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@Override
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public void free() {
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array = null;
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nioBuf = null;
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}
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2012-06-11 13:24:44 +02:00
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}
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2008-08-08 02:37:18 +02:00
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}
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