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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:
*
* https://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 io.netty.buffer;
import io.netty.util.internal.PlatformDependent;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
/**
* A NIO {@link ByteBuffer} based buffer. It is recommended to use
* {@link UnpooledByteBufAllocator#directBuffer(int, int)}, {@link Unpooled#directBuffer(int)} and
* {@link Unpooled#wrappedBuffer(ByteBuffer)} instead of calling the constructor explicitly.}
*/
public class UnpooledUnsafeDirectByteBuf extends UnpooledDirectByteBuf {
long memoryAddress;
/**
* Creates a new direct buffer.
*
* @param initialCapacity the initial capacity of the underlying direct buffer
* @param maxCapacity the maximum capacity of the underlying direct buffer
*/
public UnpooledUnsafeDirectByteBuf(ByteBufAllocator alloc, int initialCapacity, int maxCapacity) {
super(alloc, initialCapacity, maxCapacity);
}
/**
* Creates a new direct buffer by wrapping the specified initial buffer.
*
* @param maxCapacity the maximum capacity of the underlying direct buffer
*/
protected UnpooledUnsafeDirectByteBuf(ByteBufAllocator alloc, ByteBuffer initialBuffer, int maxCapacity) {
// We never try to free the buffer if it was provided by the end-user as we don't know if this is a duplicate or
// a slice. This is done to prevent an IllegalArgumentException when using Java9 as Unsafe.invokeCleaner(...)
// will check if the given buffer is either a duplicate or slice and in this case throw an
// IllegalArgumentException.
//
// See https://hg.openjdk.java.net/jdk9/hs-demo/jdk/file/0d2ab72ba600/src/jdk.unsupported/share/classes/
// sun/misc/Unsafe.java#l1250
//
// We also call slice() explicitly here to preserve behaviour with previous netty releases.
super(alloc, initialBuffer, maxCapacity, /* doFree = */ false, /* slice = */ true);
}
UnpooledUnsafeDirectByteBuf(ByteBufAllocator alloc, ByteBuffer initialBuffer, int maxCapacity, boolean doFree) {
super(alloc, initialBuffer, maxCapacity, doFree, false);
}
@Override
final void setByteBuffer(ByteBuffer buffer, boolean tryFree) {
super.setByteBuffer(buffer, tryFree);
memoryAddress = PlatformDependent.directBufferAddress(buffer);
}
@Override
public boolean hasMemoryAddress() {
return true;
}
@Override
public long memoryAddress() {
ensureAccessible();
return memoryAddress;
}
@Override
public byte getByte(int index) {
checkIndex(index);
return _getByte(index);
}
@Override
protected byte _getByte(int index) {
return UnsafeByteBufUtil.getByte(addr(index));
}
@Override
public short getShort(int index) {
checkIndex(index, 2);
return _getShort(index);
}
@Override
protected short _getShort(int index) {
return UnsafeByteBufUtil.getShort(addr(index));
}
@Override
protected short _getShortLE(int index) {
return UnsafeByteBufUtil.getShortLE(addr(index));
}
@Override
public int getUnsignedMedium(int index) {
checkIndex(index, 3);
return _getUnsignedMedium(index);
}
@Override
protected int _getUnsignedMedium(int index) {
return UnsafeByteBufUtil.getUnsignedMedium(addr(index));
}
@Override
protected int _getUnsignedMediumLE(int index) {
return UnsafeByteBufUtil.getUnsignedMediumLE(addr(index));
}
@Override
public int getInt(int index) {
checkIndex(index, 4);
return _getInt(index);
}
@Override
protected int _getInt(int index) {
return UnsafeByteBufUtil.getInt(addr(index));
}
@Override
protected int _getIntLE(int index) {
return UnsafeByteBufUtil.getIntLE(addr(index));
}
@Override
public long getLong(int index) {
checkIndex(index, 8);
return _getLong(index);
}
@Override
protected long _getLong(int index) {
return UnsafeByteBufUtil.getLong(addr(index));
}
@Override
protected long _getLongLE(int index) {
return UnsafeByteBufUtil.getLongLE(addr(index));
}
@Override
public ByteBuf getBytes(int index, ByteBuf dst, int dstIndex, int length) {
UnsafeByteBufUtil.getBytes(this, addr(index), index, dst, dstIndex, length);
return this;
}
@Override
void getBytes(int index, byte[] dst, int dstIndex, int length, boolean internal) {
UnsafeByteBufUtil.getBytes(this, addr(index), index, dst, dstIndex, length);
}
@Override
void getBytes(int index, ByteBuffer dst, boolean internal) {
UnsafeByteBufUtil.getBytes(this, addr(index), index, dst);
}
@Override
public ByteBuf setByte(int index, int value) {
checkIndex(index);
_setByte(index, value);
return this;
}
@Override
protected void _setByte(int index, int value) {
UnsafeByteBufUtil.setByte(addr(index), value);
}
@Override
public ByteBuf setShort(int index, int value) {
checkIndex(index, 2);
_setShort(index, value);
return this;
}
@Override
protected void _setShort(int index, int value) {
UnsafeByteBufUtil.setShort(addr(index), value);
}
@Override
protected void _setShortLE(int index, int value) {
UnsafeByteBufUtil.setShortLE(addr(index), value);
}
@Override
public ByteBuf setMedium(int index, int value) {
checkIndex(index, 3);
_setMedium(index, value);
return this;
}
@Override
protected void _setMedium(int index, int value) {
UnsafeByteBufUtil.setMedium(addr(index), value);
}
@Override
protected void _setMediumLE(int index, int value) {
UnsafeByteBufUtil.setMediumLE(addr(index), value);
}
@Override
public ByteBuf setInt(int index, int value) {
checkIndex(index, 4);
_setInt(index, value);
return this;
}
@Override
protected void _setInt(int index, int value) {
UnsafeByteBufUtil.setInt(addr(index), value);
}
@Override
protected void _setIntLE(int index, int value) {
UnsafeByteBufUtil.setIntLE(addr(index), value);
}
@Override
public ByteBuf setLong(int index, long value) {
checkIndex(index, 8);
_setLong(index, value);
return this;
}
@Override
protected void _setLong(int index, long value) {
UnsafeByteBufUtil.setLong(addr(index), value);
}
@Override
protected void _setLongLE(int index, long value) {
UnsafeByteBufUtil.setLongLE(addr(index), value);
}
@Override
public ByteBuf setBytes(int index, ByteBuf src, int srcIndex, int length) {
UnsafeByteBufUtil.setBytes(this, addr(index), index, src, srcIndex, length);
return this;
}
@Override
public ByteBuf setBytes(int index, byte[] src, int srcIndex, int length) {
UnsafeByteBufUtil.setBytes(this, addr(index), index, src, srcIndex, length);
return this;
}
@Override
public ByteBuf setBytes(int index, ByteBuffer src) {
UnsafeByteBufUtil.setBytes(this, addr(index), index, src);
return this;
}
@Override
void getBytes(int index, OutputStream out, int length, boolean internal) throws IOException {
UnsafeByteBufUtil.getBytes(this, addr(index), index, out, length);
}
@Override
public int setBytes(int index, InputStream in, int length) throws IOException {
return UnsafeByteBufUtil.setBytes(this, addr(index), index, in, length);
}
@Override
public ByteBuf copy(int index, int length) {
return UnsafeByteBufUtil.copy(this, addr(index), index, length);
}
final long addr(int index) {
return memoryAddress + index;
}
@Override
protected SwappedByteBuf newSwappedByteBuf() {
if (PlatformDependent.isUnaligned()) {
// Only use if unaligned access is supported otherwise there is no gain.
return new UnsafeDirectSwappedByteBuf(this);
}
return super.newSwappedByteBuf();
}
@Override
public ByteBuf setZero(int index, int length) {
checkIndex(index, length);
UnsafeByteBufUtil.setZero(addr(index), length);
return this;
}
@Override
public ByteBuf writeZero(int length) {
ensureWritable(length);
int wIndex = writerIndex;
UnsafeByteBufUtil.setZero(addr(wIndex), length);
writerIndex = wIndex + length;
return this;
}
}
