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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import java.nio.channels.GatheringByteChannel;
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import java.nio.channels.ScatteringByteChannel;
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/**
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2008-09-02 09:13:20 +02:00
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* A derived buffer which exposes its parent's sub-region only. It is
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2012-06-10 04:08:43 +02:00
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* recommended to use {@link ByteBuf#slice()} and
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* {@link ByteBuf#slice(int, int)} instead of calling the constructor
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2008-09-02 09:13:20 +02:00
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* explicitly.
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2008-08-08 02:37:18 +02:00
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*/
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2012-10-18 08:57:23 +02:00
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public class SlicedByteBuf extends AbstractWrappedByteBuf {
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2008-08-08 02:37:18 +02:00
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2012-07-20 05:33:17 +02:00
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private final Unsafe unsafe = new SlicedUnsafe();
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2012-06-10 04:08:43 +02:00
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private final ByteBuf buffer;
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2008-08-08 02:37:18 +02:00
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private final int adjustment;
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private final int length;
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2012-06-10 04:08:43 +02:00
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public SlicedByteBuf(ByteBuf buffer, int index, int length) {
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2012-07-19 13:23:55 +02:00
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super(buffer.order(), length);
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2008-08-08 02:37:18 +02:00
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if (index < 0 || index > buffer.capacity()) {
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2012-05-23 13:22:56 +02:00
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throw new IndexOutOfBoundsException("Invalid index of " + index
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+ ", maximum is " + buffer.capacity());
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2008-08-08 02:37:18 +02:00
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}
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if (index + length > buffer.capacity()) {
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2012-05-23 13:22:56 +02:00
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throw new IndexOutOfBoundsException("Invalid combined index of "
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+ (index + length) + ", maximum is " + buffer.capacity());
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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 (buffer instanceof SlicedByteBuf) {
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this.buffer = ((SlicedByteBuf) buffer).buffer;
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adjustment = ((SlicedByteBuf) buffer).adjustment + index;
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} else if (buffer instanceof DuplicatedByteBuf) {
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this.buffer = ((DuplicatedByteBuf) buffer).buffer;
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adjustment = index;
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} else {
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this.buffer = buffer;
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adjustment = index;
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}
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2008-08-08 02:37:18 +02:00
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this.length = length;
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2012-07-19 13:23:55 +02:00
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2008-08-08 02:37:18 +02:00
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writerIndex(length);
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2012-07-20 05:33:17 +02:00
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buffer.unsafe().acquire();
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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 ByteBuf unwrap() {
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2008-08-08 02:37:18 +02:00
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return buffer;
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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 buffer.isDirect();
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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 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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2012-10-18 08:57:23 +02:00
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public WrappedByteBuf capacity(int newCapacity) {
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2012-07-19 13:23:55 +02:00
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throw new UnsupportedOperationException("sliced buffer");
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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 buffer.hasArray();
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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 buffer.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 buffer.arrayOffset() + adjustment;
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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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checkIndex(index);
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return buffer.getByte(index + adjustment);
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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 short getShort(int index) {
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checkIndex(index, 2);
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return buffer.getShort(index + adjustment);
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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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2008-08-10 02:52:59 +02:00
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public int getUnsignedMedium(int index) {
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2008-08-08 02:37:18 +02:00
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checkIndex(index, 3);
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2008-08-10 02:52:59 +02:00
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return buffer.getUnsignedMedium(index + adjustment);
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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 getInt(int index) {
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checkIndex(index, 4);
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return buffer.getInt(index + adjustment);
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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 long getLong(int index) {
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checkIndex(index, 8);
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return buffer.getLong(index + adjustment);
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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 ByteBuf duplicate() {
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ByteBuf duplicate = new SlicedByteBuf(buffer, adjustment, length);
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2008-08-26 13:08:55 +02:00
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duplicate.setIndex(readerIndex(), writerIndex());
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return duplicate;
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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 ByteBuf copy(int index, int length) {
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2008-09-04 13:53:44 +02:00
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checkIndex(index, length);
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2008-08-08 02:37:18 +02:00
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return buffer.copy(index + adjustment, 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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2012-06-10 04:08:43 +02:00
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public ByteBuf slice(int index, int length) {
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2008-08-08 02:37:18 +02:00
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checkIndex(index, length);
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2008-08-26 17:37:08 +02:00
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if (length == 0) {
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2012-06-11 10:02:00 +02:00
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return Unpooled.EMPTY_BUFFER;
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2008-08-26 17:37:08 +02:00
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}
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2012-06-10 04:08:43 +02:00
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return new SlicedByteBuf(buffer, index + adjustment, 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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2012-10-18 08:57:23 +02:00
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public WrappedByteBuf getBytes(int index, ByteBuf dst, int dstIndex, int length) {
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2008-08-08 02:37:18 +02:00
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checkIndex(index, length);
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buffer.getBytes(index + adjustment, dst, dstIndex, length);
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2012-10-18 08:57:23 +02:00
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return this;
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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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2012-10-18 08:57:23 +02:00
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public WrappedByteBuf getBytes(int index, byte[] dst, int dstIndex, int length) {
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2008-08-08 02:37:18 +02:00
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checkIndex(index, length);
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buffer.getBytes(index + adjustment, dst, dstIndex, length);
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2012-10-18 08:57:23 +02:00
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return this;
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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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2012-10-18 08:57:23 +02:00
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public WrappedByteBuf getBytes(int index, ByteBuffer dst) {
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2008-08-08 02:37:18 +02:00
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checkIndex(index, dst.remaining());
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buffer.getBytes(index + adjustment, dst);
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2012-10-18 08:57:23 +02:00
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return this;
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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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2012-10-18 08:57:23 +02:00
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public WrappedByteBuf setByte(int index, int value) {
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2008-08-08 02:37:18 +02:00
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checkIndex(index);
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buffer.setByte(index + adjustment, value);
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2012-10-18 08:57:23 +02:00
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return this;
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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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2012-10-18 08:57:23 +02:00
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public WrappedByteBuf setShort(int index, int value) {
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2008-08-08 02:37:18 +02:00
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checkIndex(index, 2);
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buffer.setShort(index + adjustment, value);
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2012-10-18 08:57:23 +02:00
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return this;
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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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2012-10-18 08:57:23 +02:00
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public WrappedByteBuf setMedium(int index, int value) {
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2008-08-08 02:37:18 +02:00
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checkIndex(index, 3);
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buffer.setMedium(index + adjustment, value);
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2012-10-18 08:57:23 +02:00
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return this;
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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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2012-10-18 08:57:23 +02:00
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public WrappedByteBuf setInt(int index, int value) {
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2008-08-08 02:37:18 +02:00
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checkIndex(index, 4);
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buffer.setInt(index + adjustment, value);
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2012-10-18 08:57:23 +02:00
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return this;
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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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2012-10-18 08:57:23 +02:00
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public WrappedByteBuf setLong(int index, long value) {
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2008-08-08 02:37:18 +02:00
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checkIndex(index, 8);
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buffer.setLong(index + adjustment, value);
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2012-10-18 08:57:23 +02:00
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return this;
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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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2012-10-18 08:57:23 +02:00
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public WrappedByteBuf setBytes(int index, byte[] src, int srcIndex, int length) {
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2008-08-08 02:37:18 +02:00
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checkIndex(index, length);
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buffer.setBytes(index + adjustment, src, srcIndex, length);
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2012-10-18 08:57:23 +02:00
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return this;
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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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2012-10-18 08:57:23 +02:00
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public WrappedByteBuf setBytes(int index, ByteBuf src, int srcIndex, int length) {
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2008-08-08 02:37:18 +02:00
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checkIndex(index, length);
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buffer.setBytes(index + adjustment, src, srcIndex, length);
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2012-10-18 08:57:23 +02:00
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return this;
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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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2012-10-18 08:57:23 +02:00
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public WrappedByteBuf setBytes(int index, ByteBuffer src) {
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2008-08-08 02:37:18 +02:00
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checkIndex(index, src.remaining());
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buffer.setBytes(index + adjustment, src);
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2012-10-18 08:57:23 +02:00
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return this;
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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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2012-10-18 08:57:23 +02:00
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public WrappedByteBuf getBytes(int index, OutputStream out, int length)
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2008-08-08 02:37:18 +02:00
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throws IOException {
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checkIndex(index, length);
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buffer.getBytes(index + adjustment, out, length);
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2012-10-18 08:57:23 +02:00
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return this;
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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 getBytes(int index, GatheringByteChannel out, int length)
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throws IOException {
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checkIndex(index, length);
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return buffer.getBytes(index + adjustment, out, 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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2008-08-20 05:09:23 +02:00
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public int setBytes(int index, InputStream in, int length)
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2008-08-08 02:37:18 +02:00
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throws IOException {
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checkIndex(index, length);
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2008-08-20 05:09:23 +02:00
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return buffer.setBytes(index + adjustment, in, 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)
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throws IOException {
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checkIndex(index, length);
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return buffer.setBytes(index + adjustment, in, 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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2012-06-02 10:30:55 +02:00
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public boolean hasNioBuffer() {
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return buffer.hasNioBuffer();
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}
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@Override
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public ByteBuffer nioBuffer(int index, int length) {
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2008-08-08 02:37:18 +02:00
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checkIndex(index, length);
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2012-06-02 10:30:55 +02:00
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return buffer.nioBuffer(index + adjustment, length);
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2008-08-08 02:37:18 +02:00
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}
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2012-08-13 02:29:07 +02:00
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@Override
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public boolean hasNioBuffers() {
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return buffer.hasNioBuffers();
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}
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@Override
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public ByteBuffer[] nioBuffers(int index, int length) {
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checkIndex(index, length);
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return buffer.nioBuffers(index, length);
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}
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2008-08-08 02:37:18 +02:00
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private void checkIndex(int index) {
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if (index < 0 || index >= capacity()) {
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2012-05-23 13:22:56 +02:00
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throw new IndexOutOfBoundsException("Invalid index: " + index
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+ ", maximum is " + capacity());
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2008-08-08 02:37:18 +02:00
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}
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}
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|
|
|
|
|
|
private void checkIndex(int startIndex, int length) {
|
|
|
|
if (length < 0) {
|
|
|
|
throw new IllegalArgumentException(
|
|
|
|
"length is negative: " + length);
|
|
|
|
}
|
|
|
|
if (startIndex < 0) {
|
2012-05-23 13:22:56 +02:00
|
|
|
throw new IndexOutOfBoundsException("startIndex cannot be negative");
|
2008-08-08 02:37:18 +02:00
|
|
|
}
|
|
|
|
if (startIndex + length > capacity()) {
|
2012-05-23 13:22:56 +02:00
|
|
|
throw new IndexOutOfBoundsException("Index too big - Bytes needed: "
|
|
|
|
+ (startIndex + length) + ", maximum is " + capacity());
|
2008-08-08 02:37:18 +02:00
|
|
|
}
|
|
|
|
}
|
2012-07-19 13:23:55 +02:00
|
|
|
|
|
|
|
@Override
|
|
|
|
public Unsafe unsafe() {
|
2012-07-20 05:33:17 +02:00
|
|
|
return unsafe;
|
|
|
|
}
|
|
|
|
|
|
|
|
private final class SlicedUnsafe implements Unsafe {
|
|
|
|
|
|
|
|
@Override
|
|
|
|
public ByteBuffer nioBuffer() {
|
|
|
|
return buffer.nioBuffer(adjustment, length);
|
|
|
|
}
|
|
|
|
|
2012-08-13 02:29:07 +02:00
|
|
|
@Override
|
|
|
|
public ByteBuffer[] nioBuffers() {
|
|
|
|
return buffer.nioBuffers(adjustment, length);
|
|
|
|
}
|
|
|
|
|
2012-07-20 05:33:17 +02:00
|
|
|
@Override
|
|
|
|
public ByteBuf newBuffer(int initialCapacity) {
|
|
|
|
return buffer.unsafe().newBuffer(initialCapacity);
|
|
|
|
}
|
|
|
|
|
2012-08-08 10:34:00 +02:00
|
|
|
@Override
|
|
|
|
public void discardSomeReadBytes() {
|
|
|
|
throw new UnsupportedOperationException();
|
|
|
|
}
|
|
|
|
|
2012-07-20 05:33:17 +02:00
|
|
|
@Override
|
|
|
|
public void acquire() {
|
|
|
|
buffer.unsafe().acquire();
|
|
|
|
}
|
|
|
|
|
|
|
|
@Override
|
|
|
|
public void release() {
|
|
|
|
buffer.unsafe().release();
|
|
|
|
}
|
2012-07-19 13:23:55 +02:00
|
|
|
}
|
2008-08-08 02:37:18 +02:00
|
|
|
}
|