367 lines
11 KiB
Java
367 lines
11 KiB
Java
/*
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* Copyright 2009 Red Hat, Inc.
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*
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* Red Hat licenses this file to you under the Apache License, version 2.0
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* (the "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.buffer;
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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.ByteOrder;
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import java.nio.channels.ClosedChannelException;
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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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* A NIO {@link ByteBuffer} based buffer. It is recommended to use {@link ChannelBuffers#directBuffer(int)}
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* and {@link ChannelBuffers#wrappedBuffer(ByteBuffer)} instead of calling the
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* constructor explicitly.
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*
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* @author <a href="http://netty.io/">The Netty Project</a>
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* @author <a href="http://gleamynode.net/">Trustin Lee</a>
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*/
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public class ByteBufferBackedChannelBuffer extends AbstractChannelBuffer {
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private final ByteBuffer buffer;
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private final ByteOrder order;
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private final int capacity;
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/**
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* Creates a new buffer which wraps the specified buffer's slice.
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*/
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public ByteBufferBackedChannelBuffer(ByteBuffer buffer) {
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if (buffer == null) {
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throw new NullPointerException("buffer");
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}
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order = buffer.order();
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this.buffer = buffer.slice().order(order);
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capacity = buffer.remaining();
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writerIndex(capacity);
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}
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private ByteBufferBackedChannelBuffer(ByteBufferBackedChannelBuffer buffer) {
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this.buffer = buffer.buffer;
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order = buffer.order;
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capacity = buffer.capacity;
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setIndex(buffer.readerIndex(), buffer.writerIndex());
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}
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@Override
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public ChannelBufferFactory factory() {
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if (buffer.isDirect()) {
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return DirectChannelBufferFactory.getInstance(order());
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} else {
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return HeapChannelBufferFactory.getInstance(order());
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}
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}
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@Override
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public boolean isDirect() {
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return buffer.isDirect();
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}
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@Override
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public ByteOrder order() {
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return order;
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}
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@Override
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public int capacity() {
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return capacity;
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}
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@Override
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public boolean hasArray() {
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return buffer.hasArray();
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}
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@Override
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public byte[] array() {
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return buffer.array();
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}
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@Override
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public int arrayOffset() {
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return buffer.arrayOffset();
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}
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@Override
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public byte getByte(int index) {
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return buffer.get(index);
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}
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@Override
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public short getShort(int index) {
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return buffer.getShort(index);
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}
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@Override
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public int getUnsignedMedium(int index) {
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return (getByte(index) & 0xff) << 16 |
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(getByte(index+1) & 0xff) << 8 |
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(getByte(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 buffer.getInt(index);
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}
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@Override
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public long getLong(int index) {
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return buffer.getLong(index);
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}
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@Override
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public void getBytes(int index, ChannelBuffer dst, int dstIndex, int length) {
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if (dst instanceof ByteBufferBackedChannelBuffer) {
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ByteBufferBackedChannelBuffer bbdst = (ByteBufferBackedChannelBuffer) dst;
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ByteBuffer data = bbdst.buffer.duplicate();
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data.limit(dstIndex + length).position(dstIndex);
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getBytes(index, data);
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} else if (buffer.hasArray()) {
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dst.setBytes(dstIndex, buffer.array(), index + buffer.arrayOffset(), length);
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} else {
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dst.setBytes(dstIndex, this, index, length);
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}
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}
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@Override
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public void getBytes(int index, byte[] dst, int dstIndex, int length) {
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ByteBuffer data = buffer.duplicate();
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try {
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data.limit(index + length).position(index);
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} catch (IllegalArgumentException e) {
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throw new IndexOutOfBoundsException();
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}
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data.get(dst, dstIndex, length);
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}
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@Override
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public void getBytes(int index, ByteBuffer dst) {
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ByteBuffer data = buffer.duplicate();
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int bytesToCopy = Math.min(capacity() - index, dst.remaining());
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try {
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data.limit(index + bytesToCopy).position(index);
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} catch (IllegalArgumentException e) {
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throw new IndexOutOfBoundsException();
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}
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dst.put(data);
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}
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@Override
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public void setByte(int index, int value) {
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buffer.put(index, (byte) value);
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}
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@Override
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public void setShort(int index, int value) {
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buffer.putShort(index, (short) value);
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}
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@Override
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public void setMedium(int index, int value) {
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setByte(index, (byte) (value >>> 16));
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setByte(index+1, (byte) (value >>> 8));
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setByte(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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buffer.putInt(index, value);
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}
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@Override
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public void setLong(int index, long value) {
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buffer.putLong(index, value);
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}
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@Override
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public void setBytes(int index, ChannelBuffer src, int srcIndex, int length) {
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if (src instanceof ByteBufferBackedChannelBuffer) {
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ByteBufferBackedChannelBuffer bbsrc = (ByteBufferBackedChannelBuffer) src;
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ByteBuffer data = bbsrc.buffer.duplicate();
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data.limit(srcIndex + length).position(srcIndex);
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setBytes(index, data);
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} else if (buffer.hasArray()) {
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src.getBytes(srcIndex, buffer.array(), index + buffer.arrayOffset(), length);
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} else {
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src.getBytes(srcIndex, this, index, length);
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}
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}
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@Override
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public void setBytes(int index, byte[] src, int srcIndex, int length) {
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ByteBuffer data = buffer.duplicate();
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data.limit(index + length).position(index);
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data.put(src, srcIndex, length);
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}
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@Override
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public void setBytes(int index, ByteBuffer src) {
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ByteBuffer data = buffer.duplicate();
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data.limit(index + src.remaining()).position(index);
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data.put(src);
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}
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@Override
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public void getBytes(int index, OutputStream out, int length) throws IOException {
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if (length == 0) {
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return;
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}
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if (buffer.hasArray()) {
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out.write(
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buffer.array(),
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index + buffer.arrayOffset(),
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length);
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} else {
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byte[] tmp = new byte[length];
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((ByteBuffer) buffer.duplicate().position(index)).get(tmp);
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out.write(tmp);
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}
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}
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@Override
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public int getBytes(int index, GatheringByteChannel out, int length) throws IOException {
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if (length == 0) {
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return 0;
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}
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return out.write((ByteBuffer) buffer.duplicate().position(index).limit(index + length));
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}
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@Override
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public int setBytes(int index, InputStream in, int length)
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throws IOException {
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int readBytes = 0;
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if (buffer.hasArray()) {
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index += buffer.arrayOffset();
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do {
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int localReadBytes = in.read(buffer.array(), index, length);
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if (localReadBytes < 0) {
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if (readBytes == 0) {
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return -1;
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} else {
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break;
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}
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}
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readBytes += localReadBytes;
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index += localReadBytes;
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length -= localReadBytes;
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} while (length > 0);
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} else {
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byte[] tmp = new byte[length];
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int i = 0;
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do {
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int localReadBytes = in.read(tmp, i, tmp.length - i);
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if (localReadBytes < 0) {
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if (readBytes == 0) {
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return -1;
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} else {
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break;
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}
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}
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readBytes += localReadBytes;
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i += readBytes;
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} while (i < tmp.length);
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((ByteBuffer) buffer.duplicate().position(index)).put(tmp);
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}
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return readBytes;
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}
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@Override
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public int setBytes(int index, ScatteringByteChannel in, int length)
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throws IOException {
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ByteBuffer slice = (ByteBuffer) buffer.duplicate().limit(index + length).position(index);
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int readBytes = 0;
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while (readBytes < length) {
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int localReadBytes;
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try {
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localReadBytes = in.read(slice);
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} catch (ClosedChannelException e) {
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localReadBytes = -1;
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}
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if (localReadBytes < 0) {
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if (readBytes == 0) {
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return -1;
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} else {
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return readBytes;
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}
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} else if (localReadBytes == 0) {
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break;
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}
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readBytes += localReadBytes;
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}
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return readBytes;
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}
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@Override
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public ByteBuffer toByteBuffer(int index, int length) {
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if (index == 0 && length == capacity()) {
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return buffer.duplicate().order(order());
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} else {
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return ((ByteBuffer) buffer.duplicate().position(
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index).limit(index + length)).slice().order(order());
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}
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}
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@Override
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public ChannelBuffer slice(int index, int length) {
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if (index == 0 && length == capacity()) {
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ChannelBuffer slice = duplicate();
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slice.setIndex(0, length);
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return slice;
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} else {
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if (index >= 0 && length == 0) {
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return ChannelBuffers.EMPTY_BUFFER;
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}
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return new ByteBufferBackedChannelBuffer(
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((ByteBuffer) buffer.duplicate().position(
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index).limit(index + length)).order(order()));
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}
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}
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@Override
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public ChannelBuffer duplicate() {
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return new ByteBufferBackedChannelBuffer(this);
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}
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@Override
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public ChannelBuffer copy(int index, int length) {
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ByteBuffer src;
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try {
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src = (ByteBuffer) buffer.duplicate().position(index).limit(index + length);
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} catch (IllegalArgumentException e) {
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throw new IndexOutOfBoundsException();
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}
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ByteBuffer dst = buffer.isDirect() ? ByteBuffer.allocateDirect(length) : ByteBuffer.allocate(length);
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dst.put(src);
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dst.order(order());
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dst.clear();
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return new ByteBufferBackedChannelBuffer(dst);
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}
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}
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