/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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 java.nio;
import java.io.Numbers;
import org.w3c.dom.typedarray.ArrayBuffer;
import org.w3c.dom.typedarray.ArrayBufferView;
import org.w3c.dom.typedarray.Int8Array;
import com.dragome.utils.Endianness;
import com.dragome.web.html.dom.w3c.ArrayBufferFactory;
import com.dragome.web.html.dom.w3c.TypedArraysFactory;
/** DirectByteBuffer, DirectReadWriteByteBuffer and DirectReadOnlyHeapByteBuffer compose the implementation of direct byte buffers.
* <p>
* DirectByteBuffer implements all the shared readonly methods and is extended by the other two classes.
* </p>
* <p>
* All methods are marked final for runtime performance.
* </p> */
abstract class DirectByteBuffer extends BaseByteBuffer implements HasArrayBufferView
{
Int8Array byteArray;
DirectByteBuffer(int capacity)
{
this(ArrayBufferFactory.createArrayBuffer(capacity), capacity, 0);
}
DirectByteBuffer(ArrayBuffer buf)
{
this(buf, buf.getByteLength(), 0);
}
DirectByteBuffer(ArrayBuffer buffer, int capacity, int offset)
{
super(capacity);
byteArray= TypedArraysFactory.createInstanceOf(Int8Array.class, buffer, offset, capacity);
}
public ArrayBufferView getTypedArray()
{
return byteArray;
}
public int getElementSize()
{
return 1;
}
/*
* Override ByteBuffer.get(byte[], int, int) to improve performance.
*
* (non-Javadoc)
*
* @see java.nio.ByteBuffer#get(byte[], int, int)
*/
public final ByteBuffer get(byte[] dest, int off, int len)
{
int length= dest.length;
if (off < 0 || len < 0 || (long) off + (long) len > length)
{
throw new IndexOutOfBoundsException();
}
if (len > remaining())
{
throw new BufferUnderflowException();
}
for (int i= 0; i < len; i++)
{
dest[i + off]= get(position + i);
}
position+= len;
return this;
}
public final byte get()
{
// if (position == limit) {
// throw new BufferUnderflowException();
// }
return (byte) byteArray.get(position++);
}
public final byte get(int index)
{
// if (index < 0 || index >= limit) {
// throw new IndexOutOfBoundsException();
// }
return (byte) byteArray.get(index);
}
public final double getDouble()
{
return Numbers.longBitsToDouble(getLong());
}
public final double getDouble(int index)
{
return Numbers.longBitsToDouble(getLong(index));
}
public final float getFloat()
{
return Numbers.intBitsToFloat(getInt());
}
public final float getFloat(int index)
{
return Numbers.intBitsToFloat(getInt(index));
}
public final int getInt()
{
int newPosition= position + 4;
// if (newPosition > limit) {
// throw new BufferUnderflowException();
// }
int result= loadInt(position);
position= newPosition;
return result;
}
public final int getInt(int index)
{
// if (index < 0 || index + 4 > limit) {
// throw new IndexOutOfBoundsException();
// }
return loadInt(index);
}
public final long getLong()
{
int newPosition= position + 8;
// if (newPosition > limit) {
// throw new BufferUnderflowException();
// }
long result= loadLong(position);
position= newPosition;
return result;
}
public final long getLong(int index)
{
// if (index < 0 || index + 8 > limit) {
// throw new IndexOutOfBoundsException();
// }
return loadLong(index);
}
public final short getShort()
{
int newPosition= position + 2;
// if (newPosition > limit) {
// throw new BufferUnderflowException();
// }
short result= loadShort(position);
position= newPosition;
return result;
}
public final short getShort(int index)
{
// if (index < 0 || index + 2 > limit) {
// throw new IndexOutOfBoundsException();
// }
return loadShort(index);
}
public final boolean isDirect()
{
return false;
}
protected final int loadInt(int baseOffset)
{
int bytes= 0;
if (order == Endianness.BIG_ENDIAN)
{
for (int i= 0; i < 4; i++)
{
bytes= bytes << 8;
bytes= bytes | (byteArray.get(baseOffset + i) & 0xFF);
}
}
else
{
for (int i= 3; i >= 0; i--)
{
bytes= bytes << 8;
bytes= bytes | (byteArray.get(baseOffset + i) & 0xFF);
}
}
return bytes;
}
protected final long loadLong(int baseOffset)
{
long bytes= 0;
if (order == Endianness.BIG_ENDIAN)
{
for (int i= 0; i < 8; i++)
{
bytes= bytes << 8;
bytes= bytes | (byteArray.get(baseOffset + i) & 0xFF);
}
}
else
{
for (int i= 7; i >= 0; i--)
{
bytes= bytes << 8;
bytes= bytes | (byteArray.get(baseOffset + i) & 0xFF);
}
}
return bytes;
}
protected final short loadShort(int baseOffset)
{
short bytes= 0;
if (order == Endianness.BIG_ENDIAN)
{
bytes= (short) (byteArray.get(baseOffset) << 8);
bytes|= (byteArray.get(baseOffset + 1) & 0xFF);
}
else
{
bytes= (short) (byteArray.get(baseOffset + 1) << 8);
bytes|= (byteArray.get(baseOffset) & 0xFF);
}
return bytes;
}
protected final void store(int baseOffset, int value)
{
if (order == Endianness.BIG_ENDIAN)
{
for (int i= 3; i >= 0; i--)
{
byteArray.set(baseOffset + i, (byte) (value & 0xFF));
value= value >> 8;
}
}
else
{
for (int i= 0; i <= 3; i++)
{
byteArray.set(baseOffset + i, (byte) (value & 0xFF));
value= value >> 8;
}
}
}
protected final void store(int baseOffset, long value)
{
if (order == Endianness.BIG_ENDIAN)
{
for (int i= 7; i >= 0; i--)
{
byteArray.set(baseOffset + i, (byte) (value & 0xFF));
value= value >> 8;
}
}
else
{
for (int i= 0; i <= 7; i++)
{
byteArray.set(baseOffset + i, (byte) (value & 0xFF));
value= value >> 8;
}
}
}
protected final void store(int baseOffset, short value)
{
if (order == Endianness.BIG_ENDIAN)
{
byteArray.set(baseOffset, (byte) ((value >> 8) & 0xFF));
byteArray.set(baseOffset + 1, (byte) (value & 0xFF));
}
else
{
byteArray.set(baseOffset + 1, (byte) ((value >> 8) & 0xFF));
byteArray.set(baseOffset, (byte) (value & 0xFF));
}
}
}