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io.netty.buffer.FixedCompositeByteBuf Maven / Gradle / Ivy
/*
* Copyright 2013 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.EmptyArrays;
import io.netty.util.internal.RecyclableArrayList;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.ReadOnlyBufferException;
import java.nio.channels.FileChannel;
import java.nio.channels.GatheringByteChannel;
import java.nio.channels.ScatteringByteChannel;
import java.util.Collections;
/**
* {@link ByteBuf} implementation which allows to wrap an array of {@link ByteBuf} in a read-only mode.
* This is useful to write an array of {@link ByteBuf}s.
*/
final class FixedCompositeByteBuf extends AbstractReferenceCountedByteBuf {
private static final ByteBuf[] EMPTY = { Unpooled.EMPTY_BUFFER };
private final int nioBufferCount;
private final int capacity;
private final ByteBufAllocator allocator;
private final ByteOrder order;
private final ByteBuf[] buffers;
private final boolean direct;
FixedCompositeByteBuf(ByteBufAllocator allocator, ByteBuf... buffers) {
super(AbstractByteBufAllocator.DEFAULT_MAX_CAPACITY);
if (buffers.length == 0) {
this.buffers = EMPTY;
order = ByteOrder.BIG_ENDIAN;
nioBufferCount = 1;
capacity = 0;
direct = false;
} else {
ByteBuf b = buffers[0];
this.buffers = buffers;
boolean direct = true;
int nioBufferCount = b.nioBufferCount();
int capacity = b.readableBytes();
order = b.order();
for (int i = 1; i < buffers.length; i++) {
b = buffers[i];
if (buffers[i].order() != order) {
throw new IllegalArgumentException("All ByteBufs need to have same ByteOrder");
}
nioBufferCount += b.nioBufferCount();
capacity += b.readableBytes();
if (!b.isDirect()) {
direct = false;
}
}
this.nioBufferCount = nioBufferCount;
this.capacity = capacity;
this.direct = direct;
}
setIndex(0, capacity());
this.allocator = allocator;
}
@Override
public boolean isWritable() {
return false;
}
@Override
public boolean isWritable(int size) {
return false;
}
@Override
public ByteBuf discardReadBytes() {
throw new ReadOnlyBufferException();
}
@Override
public ByteBuf setBytes(int index, ByteBuf src, int srcIndex, int length) {
throw new ReadOnlyBufferException();
}
@Override
public ByteBuf setBytes(int index, byte[] src, int srcIndex, int length) {
throw new ReadOnlyBufferException();
}
@Override
public ByteBuf setBytes(int index, ByteBuffer src) {
throw new ReadOnlyBufferException();
}
@Override
public ByteBuf setByte(int index, int value) {
throw new ReadOnlyBufferException();
}
@Override
protected void _setByte(int index, int value) {
throw new ReadOnlyBufferException();
}
@Override
public ByteBuf setShort(int index, int value) {
throw new ReadOnlyBufferException();
}
@Override
protected void _setShort(int index, int value) {
throw new ReadOnlyBufferException();
}
@Override
protected void _setShortLE(int index, int value) {
throw new ReadOnlyBufferException();
}
@Override
public ByteBuf setMedium(int index, int value) {
throw new ReadOnlyBufferException();
}
@Override
protected void _setMedium(int index, int value) {
throw new ReadOnlyBufferException();
}
@Override
protected void _setMediumLE(int index, int value) {
throw new ReadOnlyBufferException();
}
@Override
public ByteBuf setInt(int index, int value) {
throw new ReadOnlyBufferException();
}
@Override
protected void _setInt(int index, int value) {
throw new ReadOnlyBufferException();
}
@Override
protected void _setIntLE(int index, int value) {
throw new ReadOnlyBufferException();
}
@Override
public ByteBuf setLong(int index, long value) {
throw new ReadOnlyBufferException();
}
@Override
protected void _setLong(int index, long value) {
throw new ReadOnlyBufferException();
}
@Override
protected void _setLongLE(int index, long value) {
throw new ReadOnlyBufferException();
}
@Override
public int setBytes(int index, InputStream in, int length) {
throw new ReadOnlyBufferException();
}
@Override
public int setBytes(int index, ScatteringByteChannel in, int length) {
throw new ReadOnlyBufferException();
}
@Override
public int setBytes(int index, FileChannel in, long position, int length) {
throw new ReadOnlyBufferException();
}
@Override
public int capacity() {
return capacity;
}
@Override
public int maxCapacity() {
return capacity;
}
@Override
public ByteBuf capacity(int newCapacity) {
throw new ReadOnlyBufferException();
}
@Override
public ByteBufAllocator alloc() {
return allocator;
}
@Override
public ByteOrder order() {
return order;
}
@Override
public ByteBuf unwrap() {
return null;
}
@Override
public boolean isDirect() {
return direct;
}
private Component findComponent(int index) {
int readable = 0;
for (int i = 0 ; i < buffers.length; i++) {
Component comp = null;
ByteBuf b = buffers[i];
if (b instanceof Component) {
comp = (Component) b;
b = comp.buf;
}
readable += b.readableBytes();
if (index < readable) {
if (comp == null) {
// Create a new component and store it in the array so it not create a new object
// on the next access.
comp = new Component(i, readable - b.readableBytes(), b);
buffers[i] = comp;
}
return comp;
}
}
throw new IllegalStateException();
}
/**
* Return the {@link ByteBuf} stored at the given index of the array.
*/
private ByteBuf buffer(int i) {
ByteBuf b = buffers[i];
return b instanceof Component ? ((Component) b).buf : b;
}
@Override
public byte getByte(int index) {
return _getByte(index);
}
@Override
protected byte _getByte(int index) {
Component c = findComponent(index);
return c.buf.getByte(index - c.offset);
}
@Override
protected short _getShort(int index) {
Component c = findComponent(index);
if (index + 2 <= c.endOffset) {
return c.buf.getShort(index - c.offset);
} else if (order() == ByteOrder.BIG_ENDIAN) {
return (short) ((_getByte(index) & 0xff) << 8 | _getByte(index + 1) & 0xff);
} else {
return (short) (_getByte(index) & 0xff | (_getByte(index + 1) & 0xff) << 8);
}
}
@Override
protected short _getShortLE(int index) {
Component c = findComponent(index);
if (index + 2 <= c.endOffset) {
return c.buf.getShortLE(index - c.offset);
} else if (order() == ByteOrder.BIG_ENDIAN) {
return (short) (_getByte(index) & 0xff | (_getByte(index + 1) & 0xff) << 8);
} else {
return (short) ((_getByte(index) & 0xff) << 8 | _getByte(index + 1) & 0xff);
}
}
@Override
protected int _getUnsignedMedium(int index) {
Component c = findComponent(index);
if (index + 3 <= c.endOffset) {
return c.buf.getUnsignedMedium(index - c.offset);
} else if (order() == ByteOrder.BIG_ENDIAN) {
return (_getShort(index) & 0xffff) << 8 | _getByte(index + 2) & 0xff;
} else {
return _getShort(index) & 0xFFFF | (_getByte(index + 2) & 0xFF) << 16;
}
}
@Override
protected int _getUnsignedMediumLE(int index) {
Component c = findComponent(index);
if (index + 3 <= c.endOffset) {
return c.buf.getUnsignedMediumLE(index - c.offset);
} else if (order() == ByteOrder.BIG_ENDIAN) {
return _getShortLE(index) & 0xffff | (_getByte(index + 2) & 0xff) << 16;
} else {
return (_getShortLE(index) & 0xffff) << 8 | _getByte(index + 2) & 0xff;
}
}
@Override
protected int _getInt(int index) {
Component c = findComponent(index);
if (index + 4 <= c.endOffset) {
return c.buf.getInt(index - c.offset);
} else if (order() == ByteOrder.BIG_ENDIAN) {
return (_getShort(index) & 0xffff) << 16 | _getShort(index + 2) & 0xffff;
} else {
return _getShort(index) & 0xFFFF | (_getShort(index + 2) & 0xFFFF) << 16;
}
}
@Override
protected int _getIntLE(int index) {
Component c = findComponent(index);
if (index + 4 <= c.endOffset) {
return c.buf.getIntLE(index - c.offset);
} else if (order() == ByteOrder.BIG_ENDIAN) {
return _getShortLE(index) & 0xFFFF | (_getShortLE(index + 2) & 0xFFFF) << 16;
} else {
return (_getShortLE(index) & 0xffff) << 16 | _getShortLE(index + 2) & 0xffff;
}
}
@Override
protected long _getLong(int index) {
Component c = findComponent(index);
if (index + 8 <= c.endOffset) {
return c.buf.getLong(index - c.offset);
} else if (order() == ByteOrder.BIG_ENDIAN) {
return (_getInt(index) & 0xffffffffL) << 32 | _getInt(index + 4) & 0xffffffffL;
} else {
return _getInt(index) & 0xFFFFFFFFL | (_getInt(index + 4) & 0xFFFFFFFFL) << 32;
}
}
@Override
protected long _getLongLE(int index) {
Component c = findComponent(index);
if (index + 8 <= c.endOffset) {
return c.buf.getLongLE(index - c.offset);
} else if (order() == ByteOrder.BIG_ENDIAN) {
return _getIntLE(index) & 0xffffffffL | (_getIntLE(index + 4) & 0xffffffffL) << 32;
} else {
return (_getIntLE(index) & 0xffffffffL) << 32 | _getIntLE(index + 4) & 0xffffffffL;
}
}
@Override
public ByteBuf getBytes(int index, byte[] dst, int dstIndex, int length) {
checkDstIndex(index, length, dstIndex, dst.length);
if (length == 0) {
return this;
}
Component c = findComponent(index);
int i = c.index;
int adjustment = c.offset;
ByteBuf s = c.buf;
for (;;) {
int localLength = Math.min(length, s.readableBytes() - (index - adjustment));
s.getBytes(index - adjustment, dst, dstIndex, localLength);
index += localLength;
dstIndex += localLength;
length -= localLength;
adjustment += s.readableBytes();
if (length <= 0) {
break;
}
s = buffer(++i);
}
return this;
}
@Override
public ByteBuf getBytes(int index, ByteBuffer dst) {
int limit = dst.limit();
int length = dst.remaining();
checkIndex(index, length);
if (length == 0) {
return this;
}
try {
Component c = findComponent(index);
int i = c.index;
int adjustment = c.offset;
ByteBuf s = c.buf;
for (;;) {
int localLength = Math.min(length, s.readableBytes() - (index - adjustment));
dst.limit(dst.position() + localLength);
s.getBytes(index - adjustment, dst);
index += localLength;
length -= localLength;
adjustment += s.readableBytes();
if (length <= 0) {
break;
}
s = buffer(++i);
}
} finally {
dst.limit(limit);
}
return this;
}
@Override
public ByteBuf getBytes(int index, ByteBuf dst, int dstIndex, int length) {
checkDstIndex(index, length, dstIndex, dst.capacity());
if (length == 0) {
return this;
}
Component c = findComponent(index);
int i = c.index;
int adjustment = c.offset;
ByteBuf s = c.buf;
for (;;) {
int localLength = Math.min(length, s.readableBytes() - (index - adjustment));
s.getBytes(index - adjustment, dst, dstIndex, localLength);
index += localLength;
dstIndex += localLength;
length -= localLength;
adjustment += s.readableBytes();
if (length <= 0) {
break;
}
s = buffer(++i);
}
return this;
}
@Override
public int getBytes(int index, GatheringByteChannel out, int length)
throws IOException {
int count = nioBufferCount();
if (count == 1) {
return out.write(internalNioBuffer(index, length));
} else {
long writtenBytes = out.write(nioBuffers(index, length));
if (writtenBytes > Integer.MAX_VALUE) {
return Integer.MAX_VALUE;
} else {
return (int) writtenBytes;
}
}
}
@Override
public int getBytes(int index, FileChannel out, long position, int length)
throws IOException {
int count = nioBufferCount();
if (count == 1) {
return out.write(internalNioBuffer(index, length), position);
} else {
long writtenBytes = 0;
for (ByteBuffer buf : nioBuffers(index, length)) {
writtenBytes += out.write(buf, position + writtenBytes);
}
if (writtenBytes > Integer.MAX_VALUE) {
return Integer.MAX_VALUE;
} else {
return (int) writtenBytes;
}
}
}
@Override
public ByteBuf getBytes(int index, OutputStream out, int length) throws IOException {
checkIndex(index, length);
if (length == 0) {
return this;
}
Component c = findComponent(index);
int i = c.index;
int adjustment = c.offset;
ByteBuf s = c.buf;
for (;;) {
int localLength = Math.min(length, s.readableBytes() - (index - adjustment));
s.getBytes(index - adjustment, out, localLength);
index += localLength;
length -= localLength;
adjustment += s.readableBytes();
if (length <= 0) {
break;
}
s = buffer(++i);
}
return this;
}
@Override
public ByteBuf copy(int index, int length) {
checkIndex(index, length);
boolean release = true;
ByteBuf buf = alloc().buffer(length);
try {
buf.writeBytes(this, index, length);
release = false;
return buf;
} finally {
if (release) {
buf.release();
}
}
}
@Override
public int nioBufferCount() {
return nioBufferCount;
}
@Override
public ByteBuffer nioBuffer(int index, int length) {
checkIndex(index, length);
if (buffers.length == 1) {
ByteBuf buf = buffer(0);
if (buf.nioBufferCount() == 1) {
return buf.nioBuffer(index, length);
}
}
ByteBuffer merged = ByteBuffer.allocate(length).order(order());
ByteBuffer[] buffers = nioBuffers(index, length);
//noinspection ForLoopReplaceableByForEach
for (int i = 0; i < buffers.length; i++) {
merged.put(buffers[i]);
}
merged.flip();
return merged;
}
@Override
public ByteBuffer internalNioBuffer(int index, int length) {
if (buffers.length == 1) {
return buffer(0).internalNioBuffer(index, length);
}
throw new UnsupportedOperationException();
}
@Override
public ByteBuffer[] nioBuffers(int index, int length) {
checkIndex(index, length);
if (length == 0) {
return EmptyArrays.EMPTY_BYTE_BUFFERS;
}
RecyclableArrayList array = RecyclableArrayList.newInstance(buffers.length);
try {
Component c = findComponent(index);
int i = c.index;
int adjustment = c.offset;
ByteBuf s = c.buf;
for (;;) {
int localLength = Math.min(length, s.readableBytes() - (index - adjustment));
switch (s.nioBufferCount()) {
case 0:
throw new UnsupportedOperationException();
case 1:
array.add(s.nioBuffer(index - adjustment, localLength));
break;
default:
Collections.addAll(array, s.nioBuffers(index - adjustment, localLength));
}
index += localLength;
length -= localLength;
adjustment += s.readableBytes();
if (length <= 0) {
break;
}
s = buffer(++i);
}
return array.toArray(new ByteBuffer[0]);
} finally {
array.recycle();
}
}
@Override
public boolean hasArray() {
switch (buffers.length) {
case 0:
return true;
case 1:
return buffer(0).hasArray();
default:
return false;
}
}
@Override
public byte[] array() {
switch (buffers.length) {
case 0:
return EmptyArrays.EMPTY_BYTES;
case 1:
return buffer(0).array();
default:
throw new UnsupportedOperationException();
}
}
@Override
public int arrayOffset() {
switch (buffers.length) {
case 0:
return 0;
case 1:
return buffer(0).arrayOffset();
default:
throw new UnsupportedOperationException();
}
}
@Override
public boolean hasMemoryAddress() {
switch (buffers.length) {
case 0:
return Unpooled.EMPTY_BUFFER.hasMemoryAddress();
case 1:
return buffer(0).hasMemoryAddress();
default:
return false;
}
}
@Override
public long memoryAddress() {
switch (buffers.length) {
case 0:
return Unpooled.EMPTY_BUFFER.memoryAddress();
case 1:
return buffer(0).memoryAddress();
default:
throw new UnsupportedOperationException();
}
}
@Override
protected void deallocate() {
for (int i = 0; i < buffers.length; i++) {
buffer(i).release();
}
}
@Override
public String toString() {
String result = super.toString();
result = result.substring(0, result.length() - 1);
return result + ", components=" + buffers.length + ')';
}
private static final class Component extends WrappedByteBuf {
private final int index;
private final int offset;
private final int endOffset;
Component(int index, int offset, ByteBuf buf) {
super(buf);
this.index = index;
this.offset = offset;
endOffset = offset + buf.readableBytes();
}
}
}
