/*
* 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.GatheringByteChannel;
import java.nio.channels.ScatteringByteChannel;
/**
* Big endian Java heap buffer implementation.
*/
public class UnpooledHeapByteBuf extends AbstractReferenceCountedByteBuf {
private final ByteBufAllocator alloc;
private byte[] array;
private ByteBuffer tmpNioBuf;
/**
* Creates a new heap buffer with a newly allocated byte array.
*
* @param initialCapacity the initial capacity of the underlying byte array
* @param maxCapacity the max capacity of the underlying byte array
*/
protected UnpooledHeapByteBuf(ByteBufAllocator alloc, int initialCapacity, int maxCapacity) {
this(alloc, new byte[initialCapacity], 0, 0, maxCapacity);
}
/**
* Creates a new heap buffer with an existing byte array.
*
* @param initialArray the initial underlying byte array
* @param maxCapacity the max capacity of the underlying byte array
*/
protected UnpooledHeapByteBuf(ByteBufAllocator alloc, byte[] initialArray, int maxCapacity) {
this(alloc, initialArray, 0, initialArray.length, maxCapacity);
}
private UnpooledHeapByteBuf(
ByteBufAllocator alloc, byte[] initialArray, int readerIndex, int writerIndex, int maxCapacity) {
super(maxCapacity);
if (alloc == null) {
throw new NullPointerException("alloc");
}
if (initialArray == null) {
throw new NullPointerException("initialArray");
}
if (initialArray.length > maxCapacity) {
throw new IllegalArgumentException(String.format(
"initialCapacity(%d) > maxCapacity(%d)", initialArray.length, maxCapacity));
}
this.alloc = alloc;
setArray(initialArray);
setIndex(readerIndex, writerIndex);
}
private void setArray(byte[] initialArray) {
array = initialArray;
tmpNioBuf = null;
}
@Override
public ByteBufAllocator alloc() {
return alloc;
}
@Override
public ByteOrder order() {
return ByteOrder.BIG_ENDIAN;
}
@Override
public boolean isDirect() {
return false;
}
@Override
public int capacity() {
ensureAccessible();
return array.length;
}
@Override
public ByteBuf capacity(int newCapacity) {
ensureAccessible();
if (newCapacity < 0 || newCapacity > maxCapacity()) {
throw new IllegalArgumentException("newCapacity: " + newCapacity);
}
int oldCapacity = array.length;
if (newCapacity > oldCapacity) {
byte[] newArray = new byte[newCapacity];
System.arraycopy(array, 0, newArray, 0, array.length);
setArray(newArray);
} else if (newCapacity < oldCapacity) {
byte[] newArray = new byte[newCapacity];
int readerIndex = readerIndex();
if (readerIndex < newCapacity) {
int writerIndex = writerIndex();
if (writerIndex > newCapacity) {
writerIndex(writerIndex = newCapacity);
}
System.arraycopy(array, readerIndex, newArray, readerIndex, writerIndex - readerIndex);
} else {
setIndex(newCapacity, newCapacity);
}
setArray(newArray);
}
return this;
}
@Override
public boolean hasArray() {
return true;
}
@Override
public byte[] array() {
ensureAccessible();
return array;
}
@Override
public int arrayOffset() {
return 0;
}
@Override
public boolean hasMemoryAddress() {
return false;
}
@Override
public long memoryAddress() {
throw new UnsupportedOperationException();
}
@Override
public ByteBuf getBytes(int index, ByteBuf dst, int dstIndex, int length) {
checkDstIndex(index, length, dstIndex, dst.capacity());
if (dst.hasMemoryAddress()) {
PlatformDependent.copyMemory(array, index, dst.memoryAddress() + dstIndex, length);
} else if (dst.hasArray()) {
getBytes(index, dst.array(), dst.arrayOffset() + dstIndex, length);
} else {
dst.setBytes(dstIndex, array, index, length);
}
return this;
}
@Override
public ByteBuf getBytes(int index, byte[] dst, int dstIndex, int length) {
checkDstIndex(index, length, dstIndex, dst.length);
System.arraycopy(array, index, dst, dstIndex, length);
return this;
}
@Override
public ByteBuf getBytes(int index, ByteBuffer dst) {
ensureAccessible();
dst.put(array, index, Math.min(capacity() - index, dst.remaining()));
return this;
}
@Override
public ByteBuf getBytes(int index, OutputStream out, int length) throws IOException {
ensureAccessible();
out.write(array, index, length);
return this;
}
@Override
public int getBytes(int index, GatheringByteChannel out, int length) throws IOException {
ensureAccessible();
return getBytes(index, out, length, false);
}
private int getBytes(int index, GatheringByteChannel out, int length, boolean internal) throws IOException {
ensureAccessible();
ByteBuffer tmpBuf;
if (internal) {
tmpBuf = internalNioBuffer();
} else {
tmpBuf = ByteBuffer.wrap(array);
}
return out.write((ByteBuffer) tmpBuf.clear().position(index).limit(index + length));
}
@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 ByteBuf setBytes(int index, ByteBuf src, int srcIndex, int length) {
checkSrcIndex(index, length, srcIndex, src.capacity());
if (src.hasMemoryAddress()) {
PlatformDependent.copyMemory(src.memoryAddress() + srcIndex, array, index, length);
} else if (src.hasArray()) {
setBytes(index, src.array(), src.arrayOffset() + srcIndex, length);
} else {
src.getBytes(srcIndex, array, index, length);
}
return this;
}
@Override
public ByteBuf setBytes(int index, byte[] src, int srcIndex, int length) {
checkSrcIndex(index, length, srcIndex, src.length);
System.arraycopy(src, srcIndex, array, index, length);
return this;
}
@Override
public ByteBuf setBytes(int index, ByteBuffer src) {
ensureAccessible();
src.get(array, index, src.remaining());
return this;
}
@Override
public int setBytes(int index, InputStream in, int length) throws IOException {
ensureAccessible();
return in.read(array, index, length);
}
@Override
public int setBytes(int index, ScatteringByteChannel in, int length) throws IOException {
ensureAccessible();
try {
return in.read((ByteBuffer) internalNioBuffer().clear().position(index).limit(index + length));
} catch (ClosedChannelException ignored) {
return -1;
}
}
@Override
public int nioBufferCount() {
return 1;
}
@Override
public ByteBuffer nioBuffer(int index, int length) {
ensureAccessible();
return ByteBuffer.wrap(array, index, length).slice();
}
@Override
public ByteBuffer[] nioBuffers(int index, int length) {
return new ByteBuffer[] { nioBuffer(index, length) };
}
@Override
public ByteBuffer internalNioBuffer(int index, int length) {
checkIndex(index, length);
return (ByteBuffer) internalNioBuffer().clear().position(index).limit(index + length);
}
@Override
public byte getByte(int index) {
ensureAccessible();
return _getByte(index);
}
@Override
protected byte _getByte(int index) {
return array[index];
}
@Override
public short getShort(int index) {
ensureAccessible();
return _getShort(index);
}
@Override
protected short _getShort(int index) {
return (short) (array[index] << 8 | array[index + 1] & 0xFF);
}
@Override
public int getUnsignedMedium(int index) {
ensureAccessible();
return _getUnsignedMedium(index);
}
@Override
protected int _getUnsignedMedium(int index) {
return (array[index] & 0xff) << 16 |
(array[index + 1] & 0xff) << 8 |
array[index + 2] & 0xff;
}
@Override
public int getInt(int index) {
ensureAccessible();
return _getInt(index);
}
@Override
protected int _getInt(int index) {
return (array[index] & 0xff) << 24 |
(array[index + 1] & 0xff) << 16 |
(array[index + 2] & 0xff) << 8 |
array[index + 3] & 0xff;
}
@Override
public long getLong(int index) {
ensureAccessible();
return _getLong(index);
}
@Override
protected long _getLong(int index) {
return ((long) array[index] & 0xff) << 56 |
((long) array[index + 1] & 0xff) << 48 |
((long) array[index + 2] & 0xff) << 40 |
((long) array[index + 3] & 0xff) << 32 |
((long) array[index + 4] & 0xff) << 24 |
((long) array[index + 5] & 0xff) << 16 |
((long) array[index + 6] & 0xff) << 8 |
(long) array[index + 7] & 0xff;
}
@Override
public ByteBuf setByte(int index, int value) {
ensureAccessible();
_setByte(index, value);
return this;
}
@Override
protected void _setByte(int index, int value) {
array[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) {
array[index] = (byte) (value >>> 8);
array[index + 1] = (byte) value;
}
@Override
public ByteBuf setMedium(int index, int value) {
ensureAccessible();
_setMedium(index, value);
return this;
}
@Override
protected void _setMedium(int index, int value) {
array[index] = (byte) (value >>> 16);
array[index + 1] = (byte) (value >>> 8);
array[index + 2] = (byte) value;
}
@Override
public ByteBuf setInt(int index, int value) {
ensureAccessible();
_setInt(index, value);
return this;
}
@Override
protected void _setInt(int index, int value) {
array[index] = (byte) (value >>> 24);
array[index + 1] = (byte) (value >>> 16);
array[index + 2] = (byte) (value >>> 8);
array[index + 3] = (byte) value;
}
@Override
public ByteBuf setLong(int index, long value) {
ensureAccessible();
_setLong(index, value);
return this;
}
@Override
protected void _setLong(int index, long value) {
array[index] = (byte) (value >>> 56);
array[index + 1] = (byte) (value >>> 48);
array[index + 2] = (byte) (value >>> 40);
array[index + 3] = (byte) (value >>> 32);
array[index + 4] = (byte) (value >>> 24);
array[index + 5] = (byte) (value >>> 16);
array[index + 6] = (byte) (value >>> 8);
array[index + 7] = (byte) value;
}
@Override
public ByteBuf copy(int index, int length) {
checkIndex(index, length);
byte[] copiedArray = new byte[length];
System.arraycopy(array, index, copiedArray, 0, length);
return new UnpooledHeapByteBuf(alloc(), copiedArray, maxCapacity());
}
private ByteBuffer internalNioBuffer() {
ByteBuffer tmpNioBuf = this.tmpNioBuf;
if (tmpNioBuf == null) {
this.tmpNioBuf = tmpNioBuf = ByteBuffer.wrap(array);
}
return tmpNioBuf;
}
@Override
protected void deallocate() {
array = null;
}
@Override
public ByteBuf unwrap() {
return null;
}
}