/*
* Copyright 2012 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package 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;
import java.nio.
ByteOrder;
import java.nio.channels.
ClosedChannelException;
import java.nio.channels.
FileChannel;
import java.nio.channels.
GatheringByteChannel;
import java.nio.channels.
ScatteringByteChannel;
/**
* 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
UnpooledDirectByteBuf extends
AbstractReferenceCountedByteBuf {
private final
ByteBufAllocator alloc;
private
ByteBuffer buffer;
private
ByteBuffer tmpNioBuf;
private int
capacity;
private boolean
doNotFree;
/**
* 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
UnpooledDirectByteBuf(
ByteBufAllocator alloc, int
initialCapacity, int
maxCapacity) {
super(
maxCapacity);
if (
alloc == null) {
throw new
NullPointerException("alloc");
}
if (
initialCapacity < 0) {
throw new
IllegalArgumentException("initialCapacity: " +
initialCapacity);
}
if (
maxCapacity < 0) {
throw new
IllegalArgumentException("maxCapacity: " +
maxCapacity);
}
if (
initialCapacity >
maxCapacity) {
throw new
IllegalArgumentException(
String.
format(
"initialCapacity(%d) > maxCapacity(%d)",
initialCapacity,
maxCapacity));
}
this.
alloc =
alloc;
setByteBuffer(
ByteBuffer.
allocateDirect(
initialCapacity));
}
/**
* Creates a new direct buffer by wrapping the specified initial buffer.
*
* @param maxCapacity the maximum capacity of the underlying direct buffer
*/
protected
UnpooledDirectByteBuf(
ByteBufAllocator alloc,
ByteBuffer initialBuffer, int
maxCapacity) {
super(
maxCapacity);
if (
alloc == null) {
throw new
NullPointerException("alloc");
}
if (
initialBuffer == null) {
throw new
NullPointerException("initialBuffer");
}
if (!
initialBuffer.
isDirect()) {
throw new
IllegalArgumentException("initialBuffer is not a direct buffer.");
}
if (
initialBuffer.
isReadOnly()) {
throw new
IllegalArgumentException("initialBuffer is a read-only buffer.");
}
int
initialCapacity =
initialBuffer.
remaining();
if (
initialCapacity >
maxCapacity) {
throw new
IllegalArgumentException(
String.
format(
"initialCapacity(%d) > maxCapacity(%d)",
initialCapacity,
maxCapacity));
}
this.
alloc =
alloc;
doNotFree = true;
setByteBuffer(
initialBuffer.
slice().
order(
ByteOrder.
BIG_ENDIAN));
writerIndex(
initialCapacity);
}
/**
* Allocate a new direct {@link ByteBuffer} with the given initialCapacity.
*/
protected
ByteBuffer allocateDirect(int
initialCapacity) {
return
ByteBuffer.
allocateDirect(
initialCapacity);
}
/**
* Free a direct {@link ByteBuffer}
*/
protected void
freeDirect(
ByteBuffer buffer) {
PlatformDependent.
freeDirectBuffer(
buffer);
}
private void
setByteBuffer(
ByteBuffer buffer) {
ByteBuffer oldBuffer = this.
buffer;
if (
oldBuffer != null) {
if (
doNotFree) {
doNotFree = false;
} else {
freeDirect(
oldBuffer);
}
}
this.
buffer =
buffer;
tmpNioBuf = null;
capacity =
buffer.
remaining();
}
@
Override
public boolean
isDirect() {
return true;
}
@
Override
public int
capacity() {
return
capacity;
}
@
Override
public
ByteBuf capacity(int
newCapacity) {
checkNewCapacity(
newCapacity);
int
readerIndex =
readerIndex();
int
writerIndex =
writerIndex();
int
oldCapacity =
capacity;
if (
newCapacity >
oldCapacity) {
ByteBuffer oldBuffer =
buffer;
ByteBuffer newBuffer =
allocateDirect(
newCapacity);
oldBuffer.
position(0).
limit(
oldBuffer.
capacity());
newBuffer.
position(0).
limit(
oldBuffer.
capacity());
newBuffer.
put(
oldBuffer);
newBuffer.
clear();
setByteBuffer(
newBuffer);
} else if (
newCapacity <
oldCapacity) {
ByteBuffer oldBuffer =
buffer;
ByteBuffer newBuffer =
allocateDirect(
newCapacity);
if (
readerIndex <
newCapacity) {
if (
writerIndex >
newCapacity) {
writerIndex(
writerIndex =
newCapacity);
}
oldBuffer.
position(
readerIndex).
limit(
writerIndex);
newBuffer.
position(
readerIndex).
limit(
writerIndex);
newBuffer.
put(
oldBuffer);
newBuffer.
clear();
} else {
setIndex(
newCapacity,
newCapacity);
}
setByteBuffer(
newBuffer);
}
return this;
}
@
Override
public
ByteBufAllocator alloc() {
return
alloc;
}
@
Override
public
ByteOrder order() {
return
ByteOrder.
BIG_ENDIAN;
}
@
Override
public boolean
hasArray() {
return false;
}
@
Override
public byte[]
array() {
throw new
UnsupportedOperationException("direct buffer");
}
@
Override
public int
arrayOffset() {
throw new
UnsupportedOperationException("direct buffer");
}
@
Override
public boolean
hasMemoryAddress() {
return false;
}
@
Override
public long
memoryAddress() {
throw new
UnsupportedOperationException();
}
@
Override
public byte
getByte(int
index) {
ensureAccessible();
return
_getByte(
index);
}
@
Override
protected byte
_getByte(int
index) {
return
buffer.
get(
index);
}
@
Override
public short
getShort(int
index) {
ensureAccessible();
return
_getShort(
index);
}
@
Override
protected short
_getShort(int
index) {
return
buffer.
getShort(
index);
}
@
Override
protected short
_getShortLE(int
index) {
return
ByteBufUtil.
swapShort(
buffer.
getShort(
index));
}
@
Override
public int
getUnsignedMedium(int
index) {
ensureAccessible();
return
_getUnsignedMedium(
index);
}
@
Override
protected int
_getUnsignedMedium(int
index) {
return (
getByte(
index) & 0xff) << 16 |
(
getByte(
index + 1) & 0xff) << 8 |
getByte(
index + 2) & 0xff;
}
@
Override
protected int
_getUnsignedMediumLE(int
index) {
return
getByte(
index) & 0xff |
(
getByte(
index + 1) & 0xff) << 8 |
(
getByte(
index + 2) & 0xff) << 16;
}
@
Override
public int
getInt(int
index) {
ensureAccessible();
return
_getInt(
index);
}
@
Override
protected int
_getInt(int
index) {
return
buffer.
getInt(
index);
}
@
Override
protected int
_getIntLE(int
index) {
return
ByteBufUtil.
swapInt(
buffer.
getInt(
index));
}
@
Override
public long
getLong(int
index) {
ensureAccessible();
return
_getLong(
index);
}
@
Override
protected long
_getLong(int
index) {
return
buffer.
getLong(
index);
}
@
Override
protected long
_getLongLE(int
index) {
return
ByteBufUtil.
swapLong(
buffer.
getLong(
index));
}
@
Override
public
ByteBuf getBytes(int
index,
ByteBuf dst, int
dstIndex, int
length) {
checkDstIndex(
index,
length,
dstIndex,
dst.
capacity());
if (
dst.
hasArray()) {
getBytes(
index,
dst.
array(),
dst.
arrayOffset() +
dstIndex,
length);
} else if (
dst.
nioBufferCount() > 0) {
for (
ByteBuffer bb:
dst.
nioBuffers(
dstIndex,
length)) {
int
bbLen =
bb.
remaining();
getBytes(
index,
bb);
index +=
bbLen;
}
} else {
dst.
setBytes(
dstIndex, this,
index,
length);
}
return this;
}
@
Override
public
ByteBuf getBytes(int
index, byte[]
dst, int
dstIndex, int
length) {
getBytes(
index,
dst,
dstIndex,
length, false);
return this;
}
private void
getBytes(int
index, byte[]
dst, int
dstIndex, int
length, boolean
internal) {
checkDstIndex(
index,
length,
dstIndex,
dst.length);
ByteBuffer tmpBuf;
if (
internal) {
tmpBuf =
internalNioBuffer();
} else {
tmpBuf =
buffer.
duplicate();
}
tmpBuf.
clear().
position(
index).
limit(
index +
length);
tmpBuf.
get(
dst,
dstIndex,
length);
}
@
Override
public
ByteBuf readBytes(byte[]
dst, int
dstIndex, int
length) {
checkReadableBytes(
length);
getBytes(
readerIndex,
dst,
dstIndex,
length, true);
readerIndex +=
length;
return this;
}
@
Override
public
ByteBuf getBytes(int
index,
ByteBuffer dst) {
getBytes(
index,
dst, false);
return this;
}
private void
getBytes(int
index,
ByteBuffer dst, boolean
internal) {
checkIndex(
index,
dst.
remaining());
ByteBuffer tmpBuf;
if (
internal) {
tmpBuf =
internalNioBuffer();
} else {
tmpBuf =
buffer.
duplicate();
}
tmpBuf.
clear().
position(
index).
limit(
index +
dst.
remaining());
dst.
put(
tmpBuf);
}
@
Override
public
ByteBuf readBytes(
ByteBuffer dst) {
int
length =
dst.
remaining();
checkReadableBytes(
length);
getBytes(
readerIndex,
dst, true);
readerIndex +=
length;
return this;
}
@
Override
public
ByteBuf setByte(int
index, int
value) {
ensureAccessible();
_setByte(
index,
value);
return this;
}
@
Override
protected void
_setByte(int
index, int
value) {
buffer.
put(
index, (byte)
value);
}
@
Override
public
ByteBuf setShort(int
index, int
value) {
ensureAccessible();
_setShort(
index,
value);
return this;
}
@
Override
protected void
_setShort(int
index, int
value) {
buffer.
putShort(
index, (short)
value);
}
@
Override
protected void
_setShortLE(int
index, int
value) {
buffer.
putShort(
index,
ByteBufUtil.
swapShort((short)
value));
}
@
Override
public
ByteBuf setMedium(int
index, int
value) {
ensureAccessible();
_setMedium(
index,
value);
return this;
}
@
Override
protected void
_setMedium(int
index, int
value) {
setByte(
index, (byte) (
value >>> 16));
setByte(
index + 1, (byte) (
value >>> 8));
setByte(
index + 2, (byte)
value);
}
@
Override
protected void
_setMediumLE(int
index, int
value) {
setByte(
index, (byte)
value);
setByte(
index + 1, (byte) (
value >>> 8));
setByte(
index + 2, (byte) (
value >>> 16));
}
@
Override
public
ByteBuf setInt(int
index, int
value) {
ensureAccessible();
_setInt(
index,
value);
return this;
}
@
Override
protected void
_setInt(int
index, int
value) {
buffer.
putInt(
index,
value);
}
@
Override
protected void
_setIntLE(int
index, int
value) {
buffer.
putInt(
index,
ByteBufUtil.
swapInt(
value));
}
@
Override
public
ByteBuf setLong(int
index, long
value) {
ensureAccessible();
_setLong(
index,
value);
return this;
}
@
Override
protected void
_setLong(int
index, long
value) {
buffer.
putLong(
index,
value);
}
@
Override
protected void
_setLongLE(int
index, long
value) {
buffer.
putLong(
index,
ByteBufUtil.
swapLong(
value));
}
@
Override
public
ByteBuf setBytes(int
index,
ByteBuf src, int
srcIndex, int
length) {
checkSrcIndex(
index,
length,
srcIndex,
src.
capacity());
if (
src.
nioBufferCount() > 0) {
for (
ByteBuffer bb:
src.
nioBuffers(
srcIndex,
length)) {
int
bbLen =
bb.
remaining();
setBytes(
index,
bb);
index +=
bbLen;
}
} else {
src.
getBytes(
srcIndex, this,
index,
length);
}
return this;
}
@
Override
public
ByteBuf setBytes(int
index, byte[]
src, int
srcIndex, int
length) {
checkSrcIndex(
index,
length,
srcIndex,
src.length);
ByteBuffer tmpBuf =
internalNioBuffer();
tmpBuf.
clear().
position(
index).
limit(
index +
length);
tmpBuf.
put(
src,
srcIndex,
length);
return this;
}
@
Override
public
ByteBuf setBytes(int
index,
ByteBuffer src) {
ensureAccessible();
ByteBuffer tmpBuf =
internalNioBuffer();
if (
src ==
tmpBuf) {
src =
src.
duplicate();
}
tmpBuf.
clear().
position(
index).
limit(
index +
src.
remaining());
tmpBuf.
put(
src);
return this;
}
@
Override
public
ByteBuf getBytes(int
index,
OutputStream out, int
length) throws
IOException {
getBytes(
index,
out,
length, false);
return this;
}
private void
getBytes(int
index,
OutputStream out, int
length, boolean
internal) throws
IOException {
ensureAccessible();
if (
length == 0) {
return;
}
ByteBufUtil.
readBytes(
alloc(),
internal ?
internalNioBuffer() :
buffer.
duplicate(),
index,
length,
out);
}
@
Override
public
ByteBuf readBytes(
OutputStream out, int
length) throws
IOException {
checkReadableBytes(
length);
getBytes(
readerIndex,
out,
length, true);
readerIndex +=
length;
return this;
}
@
Override
public int
getBytes(int
index,
GatheringByteChannel out, int
length) throws
IOException {
return
getBytes(
index,
out,
length, false);
}
private int
getBytes(int
index,
GatheringByteChannel out, int
length, boolean
internal) throws
IOException {
ensureAccessible();
if (
length == 0) {
return 0;
}
ByteBuffer tmpBuf;
if (
internal) {
tmpBuf =
internalNioBuffer();
} else {
tmpBuf =
buffer.
duplicate();
}
tmpBuf.
clear().
position(
index).
limit(
index +
length);
return
out.
write(
tmpBuf);
}
@
Override
public int
getBytes(int
index,
FileChannel out, long
position, int
length) throws
IOException {
return
getBytes(
index,
out,
position,
length, false);
}
private int
getBytes(int
index,
FileChannel out, long
position, int
length, boolean
internal) throws
IOException {
ensureAccessible();
if (
length == 0) {
return 0;
}
ByteBuffer tmpBuf =
internal ?
internalNioBuffer() :
buffer.
duplicate();
tmpBuf.
clear().
position(
index).
limit(
index +
length);
return
out.
write(
tmpBuf,
position);
}
@
Override
public int
readBytes(
GatheringByteChannel out, int
length) throws
IOException {
checkReadableBytes(
length);
int
readBytes =
getBytes(
readerIndex,
out,
length, true);
readerIndex +=
readBytes;
return
readBytes;
}
@
Override
public int
readBytes(
FileChannel out, long
position, int
length) throws
IOException {
checkReadableBytes(
length);
int
readBytes =
getBytes(
readerIndex,
out,
position,
length, true);
readerIndex +=
readBytes;
return
readBytes;
}
@
Override
public int
setBytes(int
index,
InputStream in, int
length) throws
IOException {
ensureAccessible();
if (
buffer.
hasArray()) {
return
in.
read(
buffer.
array(),
buffer.
arrayOffset() +
index,
length);
} else {
byte[]
tmp = new byte[
length];
int
readBytes =
in.
read(
tmp);
if (
readBytes <= 0) {
return
readBytes;
}
ByteBuffer tmpBuf =
internalNioBuffer();
tmpBuf.
clear().
position(
index);
tmpBuf.
put(
tmp, 0,
readBytes);
return
readBytes;
}
}
@
Override
public int
setBytes(int
index,
ScatteringByteChannel in, int
length) throws
IOException {
ensureAccessible();
ByteBuffer tmpBuf =
internalNioBuffer();
tmpBuf.
clear().
position(
index).
limit(
index +
length);
try {
return
in.
read(
tmpNioBuf);
} catch (
ClosedChannelException ignored) {
return -1;
}
}
@
Override
public int
setBytes(int
index,
FileChannel in, long
position, int
length) throws
IOException {
ensureAccessible();
ByteBuffer tmpBuf =
internalNioBuffer();
tmpBuf.
clear().
position(
index).
limit(
index +
length);
try {
return
in.
read(
tmpNioBuf,
position);
} catch (
ClosedChannelException ignored) {
return -1;
}
}
@
Override
public int
nioBufferCount() {
return 1;
}
@
Override
public
ByteBuffer[]
nioBuffers(int
index, int
length) {
return new
ByteBuffer[] {
nioBuffer(
index,
length) };
}
@
Override
public
ByteBuf copy(int
index, int
length) {
ensureAccessible();
ByteBuffer src;
try {
src = (
ByteBuffer)
buffer.
duplicate().
clear().
position(
index).
limit(
index +
length);
} catch (
IllegalArgumentException ignored) {
throw new
IndexOutOfBoundsException("Too many bytes to read - Need " + (
index +
length));
}
return
alloc().
directBuffer(
length,
maxCapacity()).
writeBytes(
src);
}
@
Override
public
ByteBuffer internalNioBuffer(int
index, int
length) {
checkIndex(
index,
length);
return (
ByteBuffer)
internalNioBuffer().
clear().
position(
index).
limit(
index +
length);
}
private
ByteBuffer internalNioBuffer() {
ByteBuffer tmpNioBuf = this.
tmpNioBuf;
if (
tmpNioBuf == null) {
this.
tmpNioBuf =
tmpNioBuf =
buffer.
duplicate();
}
return
tmpNioBuf;
}
@
Override
public
ByteBuffer nioBuffer(int
index, int
length) {
checkIndex(
index,
length);
return ((
ByteBuffer)
buffer.
duplicate().
position(
index).
limit(
index +
length)).
slice();
}
@
Override
protected void
deallocate() {
ByteBuffer buffer = this.
buffer;
if (
buffer == null) {
return;
}
this.
buffer = null;
if (!
doNotFree) {
freeDirect(
buffer);
}
}
@
Override
public
ByteBuf unwrap() {
return null;
}
}