433 lines
10 KiB
Java
433 lines
10 KiB
Java
/* DirectByteBufferImpl.java --
|
|
Copyright (C) 2003, 2004 Free Software Foundation, Inc.
|
|
|
|
This file is part of GNU Classpath.
|
|
|
|
GNU Classpath is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
GNU Classpath is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with GNU Classpath; see the file COPYING. If not, write to the
|
|
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
02110-1301 USA.
|
|
|
|
Linking this library statically or dynamically with other modules is
|
|
making a combined work based on this library. Thus, the terms and
|
|
conditions of the GNU General Public License cover the whole
|
|
combination.
|
|
|
|
As a special exception, the copyright holders of this library give you
|
|
permission to link this library with independent modules to produce an
|
|
executable, regardless of the license terms of these independent
|
|
modules, and to copy and distribute the resulting executable under
|
|
terms of your choice, provided that you also meet, for each linked
|
|
independent module, the terms and conditions of the license of that
|
|
module. An independent module is a module which is not derived from
|
|
or based on this library. If you modify this library, you may extend
|
|
this exception to your version of the library, but you are not
|
|
obligated to do so. If you do not wish to do so, delete this
|
|
exception statement from your version. */
|
|
|
|
|
|
package java.nio;
|
|
|
|
import gnu.classpath.Pointer;
|
|
|
|
abstract class DirectByteBufferImpl extends ByteBuffer
|
|
{
|
|
/**
|
|
* The owner is used to keep alive the object that actually owns the
|
|
* memory. There are three possibilities:
|
|
* 1) owner == this: We allocated the memory and we should free it,
|
|
* but *only* in finalize (if we've been sliced
|
|
* other objects will also have access to the
|
|
* memory).
|
|
* 2) owner == null: The byte buffer was created thru
|
|
* JNI.NewDirectByteBuffer. The JNI code is
|
|
* responsible for freeing the memory.
|
|
* 3) owner == some other object: The other object allocated the
|
|
* memory and should free it.
|
|
*/
|
|
private final Object owner;
|
|
|
|
static final class ReadOnly extends DirectByteBufferImpl
|
|
{
|
|
ReadOnly(Object owner, Pointer address,
|
|
int capacity, int limit,
|
|
int position)
|
|
{
|
|
super(owner, address, capacity, limit, position);
|
|
}
|
|
|
|
public ByteBuffer put(byte value)
|
|
{
|
|
throw new ReadOnlyBufferException ();
|
|
}
|
|
|
|
public ByteBuffer put(int index, byte value)
|
|
{
|
|
throw new ReadOnlyBufferException ();
|
|
}
|
|
|
|
public boolean isReadOnly()
|
|
{
|
|
return true;
|
|
}
|
|
}
|
|
|
|
static final class ReadWrite extends DirectByteBufferImpl
|
|
{
|
|
ReadWrite(int capacity)
|
|
{
|
|
super(capacity);
|
|
}
|
|
|
|
ReadWrite(Object owner, Pointer address,
|
|
int capacity, int limit,
|
|
int position)
|
|
{
|
|
super(owner, address, capacity, limit, position);
|
|
}
|
|
|
|
public boolean isReadOnly()
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
|
|
DirectByteBufferImpl(int capacity)
|
|
{
|
|
super(capacity, capacity, 0, -1);
|
|
this.owner = this;
|
|
this.address = VMDirectByteBuffer.allocate(capacity);
|
|
}
|
|
|
|
DirectByteBufferImpl(Object owner, Pointer address,
|
|
int capacity, int limit,
|
|
int position)
|
|
{
|
|
super(capacity, limit, position, -1);
|
|
this.owner = owner;
|
|
this.address = address;
|
|
}
|
|
|
|
/**
|
|
* Allocates a new direct byte buffer.
|
|
*/
|
|
public static ByteBuffer allocate(int capacity)
|
|
{
|
|
return new DirectByteBufferImpl.ReadWrite(capacity);
|
|
}
|
|
|
|
protected void finalize() throws Throwable
|
|
{
|
|
if (owner == this)
|
|
VMDirectByteBuffer.free(address);
|
|
}
|
|
|
|
public byte get()
|
|
{
|
|
checkForUnderflow();
|
|
|
|
int pos = position();
|
|
byte result = VMDirectByteBuffer.get(address, pos);
|
|
position(pos + 1);
|
|
return result;
|
|
}
|
|
|
|
public byte get(int index)
|
|
{
|
|
checkIndex(index);
|
|
|
|
return VMDirectByteBuffer.get(address, index);
|
|
}
|
|
|
|
public ByteBuffer get(byte[] dst, int offset, int length)
|
|
{
|
|
checkArraySize(dst.length, offset, length);
|
|
checkForUnderflow(length);
|
|
|
|
int index = position();
|
|
VMDirectByteBuffer.get(address, index, dst, offset, length);
|
|
position(index+length);
|
|
|
|
return this;
|
|
}
|
|
|
|
public ByteBuffer put(byte value)
|
|
{
|
|
checkForOverflow();
|
|
|
|
int pos = position();
|
|
VMDirectByteBuffer.put(address, pos, value);
|
|
position(pos + 1);
|
|
return this;
|
|
}
|
|
|
|
public ByteBuffer put(int index, byte value)
|
|
{
|
|
checkIndex(index);
|
|
|
|
VMDirectByteBuffer.put(address, index, value);
|
|
return this;
|
|
}
|
|
|
|
public ByteBuffer put (byte[] src, int offset, int length)
|
|
{
|
|
checkArraySize (src.length, offset, length);
|
|
checkForUnderflow (length);
|
|
|
|
int index = position ();
|
|
VMDirectByteBuffer.put (address, index, src, offset, length);
|
|
position (index + length);
|
|
|
|
return this;
|
|
}
|
|
|
|
void shiftDown(int dst_offset, int src_offset, int count)
|
|
{
|
|
VMDirectByteBuffer.shiftDown(address, dst_offset, src_offset, count);
|
|
}
|
|
|
|
public ByteBuffer compact()
|
|
{
|
|
checkIfReadOnly();
|
|
mark = -1;
|
|
int pos = position();
|
|
if (pos > 0)
|
|
{
|
|
int count = remaining();
|
|
VMDirectByteBuffer.shiftDown(address, 0, pos, count);
|
|
position(count);
|
|
limit(capacity());
|
|
}
|
|
else
|
|
{
|
|
position(limit());
|
|
limit(capacity());
|
|
}
|
|
return this;
|
|
}
|
|
|
|
public ByteBuffer slice()
|
|
{
|
|
int rem = remaining();
|
|
if (isReadOnly())
|
|
return new DirectByteBufferImpl.ReadOnly
|
|
(owner, VMDirectByteBuffer.adjustAddress(address, position()),
|
|
rem, rem, 0);
|
|
else
|
|
return new DirectByteBufferImpl.ReadWrite
|
|
(owner, VMDirectByteBuffer.adjustAddress(address, position()),
|
|
rem, rem, 0);
|
|
}
|
|
|
|
private ByteBuffer duplicate(boolean readOnly)
|
|
{
|
|
int pos = position();
|
|
if (this.mark != -1)
|
|
reset();
|
|
int mark = position();
|
|
position(pos);
|
|
DirectByteBufferImpl result;
|
|
if (readOnly)
|
|
result = new DirectByteBufferImpl.ReadOnly(owner, address, capacity(),
|
|
limit(), pos);
|
|
else
|
|
result = new DirectByteBufferImpl.ReadWrite(owner, address, capacity(),
|
|
limit(), pos);
|
|
|
|
if (mark != pos)
|
|
{
|
|
result.position(mark);
|
|
result.mark();
|
|
result.position(pos);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
public ByteBuffer duplicate()
|
|
{
|
|
return duplicate(isReadOnly());
|
|
}
|
|
|
|
public ByteBuffer asReadOnlyBuffer()
|
|
{
|
|
return duplicate(true);
|
|
}
|
|
|
|
public boolean isDirect()
|
|
{
|
|
return true;
|
|
}
|
|
|
|
public CharBuffer asCharBuffer()
|
|
{
|
|
return new CharViewBufferImpl(this, remaining() >> 1);
|
|
}
|
|
|
|
public ShortBuffer asShortBuffer()
|
|
{
|
|
return new ShortViewBufferImpl(this, remaining() >> 1);
|
|
}
|
|
|
|
public IntBuffer asIntBuffer()
|
|
{
|
|
return new IntViewBufferImpl(this, remaining() >> 2);
|
|
}
|
|
|
|
public LongBuffer asLongBuffer()
|
|
{
|
|
return new LongViewBufferImpl(this, remaining() >> 3);
|
|
}
|
|
|
|
public FloatBuffer asFloatBuffer()
|
|
{
|
|
return new FloatViewBufferImpl(this, remaining() >> 2);
|
|
}
|
|
|
|
public DoubleBuffer asDoubleBuffer()
|
|
{
|
|
return new DoubleViewBufferImpl(this, remaining() >> 3);
|
|
}
|
|
|
|
public char getChar()
|
|
{
|
|
return ByteBufferHelper.getChar(this, order());
|
|
}
|
|
|
|
public ByteBuffer putChar(char value)
|
|
{
|
|
ByteBufferHelper.putChar(this, value, order());
|
|
return this;
|
|
}
|
|
|
|
public char getChar(int index)
|
|
{
|
|
return ByteBufferHelper.getChar(this, index, order());
|
|
}
|
|
|
|
public ByteBuffer putChar(int index, char value)
|
|
{
|
|
ByteBufferHelper.putChar(this, index, value, order());
|
|
return this;
|
|
}
|
|
|
|
public short getShort()
|
|
{
|
|
return ByteBufferHelper.getShort(this, order());
|
|
}
|
|
|
|
public ByteBuffer putShort(short value)
|
|
{
|
|
ByteBufferHelper.putShort(this, value, order());
|
|
return this;
|
|
}
|
|
|
|
public short getShort(int index)
|
|
{
|
|
return ByteBufferHelper.getShort(this, index, order());
|
|
}
|
|
|
|
public ByteBuffer putShort(int index, short value)
|
|
{
|
|
ByteBufferHelper.putShort(this, index, value, order());
|
|
return this;
|
|
}
|
|
|
|
public int getInt()
|
|
{
|
|
return ByteBufferHelper.getInt(this, order());
|
|
}
|
|
|
|
public ByteBuffer putInt(int value)
|
|
{
|
|
ByteBufferHelper.putInt(this, value, order());
|
|
return this;
|
|
}
|
|
|
|
public int getInt(int index)
|
|
{
|
|
return ByteBufferHelper.getInt(this, index, order());
|
|
}
|
|
|
|
public ByteBuffer putInt(int index, int value)
|
|
{
|
|
ByteBufferHelper.putInt(this, index, value, order());
|
|
return this;
|
|
}
|
|
|
|
public long getLong()
|
|
{
|
|
return ByteBufferHelper.getLong(this, order());
|
|
}
|
|
|
|
public ByteBuffer putLong(long value)
|
|
{
|
|
ByteBufferHelper.putLong(this, value, order());
|
|
return this;
|
|
}
|
|
|
|
public long getLong(int index)
|
|
{
|
|
return ByteBufferHelper.getLong(this, index, order());
|
|
}
|
|
|
|
public ByteBuffer putLong(int index, long value)
|
|
{
|
|
ByteBufferHelper.putLong(this, index, value, order());
|
|
return this;
|
|
}
|
|
|
|
public float getFloat()
|
|
{
|
|
return ByteBufferHelper.getFloat(this, order());
|
|
}
|
|
|
|
public ByteBuffer putFloat(float value)
|
|
{
|
|
ByteBufferHelper.putFloat(this, value, order());
|
|
return this;
|
|
}
|
|
|
|
public float getFloat(int index)
|
|
{
|
|
return ByteBufferHelper.getFloat(this, index, order());
|
|
}
|
|
|
|
public ByteBuffer putFloat(int index, float value)
|
|
{
|
|
ByteBufferHelper.putFloat(this, index, value, order());
|
|
return this;
|
|
}
|
|
|
|
public double getDouble()
|
|
{
|
|
return ByteBufferHelper.getDouble(this, order());
|
|
}
|
|
|
|
public ByteBuffer putDouble(double value)
|
|
{
|
|
ByteBufferHelper.putDouble(this, value, order());
|
|
return this;
|
|
}
|
|
|
|
public double getDouble(int index)
|
|
{
|
|
return ByteBufferHelper.getDouble(this, index, order());
|
|
}
|
|
|
|
public ByteBuffer putDouble(int index, double value)
|
|
{
|
|
ByteBufferHelper.putDouble(this, index, value, order());
|
|
return this;
|
|
}
|
|
}
|