/*******************************************************************************
* Copyright (c) 2009, 2010 Wind River Systems, Inc. and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Ted R Williams (Wind River Systems, Inc.) - initial implementation
*******************************************************************************/
package org.eclipse.cdt.debug.ui.memory.transport;
import java.math.BigInteger;
import org.eclipse.debug.core.DebugException;
import org.eclipse.debug.core.model.IMemoryBlockExtension;
public class BufferedMemoryWriter
{
private IMemoryBlockExtension fBlock;
private byte[] fBuffer;
private int fBufferPosition = 0;
private BigInteger fBufferStart = null;
public BufferedMemoryWriter(IMemoryBlockExtension block, int bufferLength)
{
fBlock = block;
fBuffer = new byte[bufferLength];
}
public void write(BigInteger address, byte[] data) throws DebugException
{
while(data.length > 0)
{
if(fBufferStart == null)
{
fBufferStart = address;
int length = data.length <= fBuffer.length ? data.length : fBuffer.length;
System.arraycopy(data, 0, fBuffer, 0, length);
fBufferPosition = length;
byte[] dataRemainder = new byte[data.length - length];
System.arraycopy(data, length, dataRemainder, 0, data.length - length);
data = dataRemainder;
address = address.add(BigInteger.valueOf(length));
}
else if(fBufferStart.add(BigInteger.valueOf(fBufferPosition)).compareTo(address) != 0)
{
flush();
}
else
{
int availableBufferLength = fBuffer.length - fBufferPosition;
int length = data.length <= availableBufferLength
? data.length : availableBufferLength;
System.arraycopy(data, 0, fBuffer, fBufferPosition, length);
fBufferPosition += length;
byte[] dataRemainder = new byte[data.length - length];
System.arraycopy(data, length, dataRemainder, 0, data.length - length);
data = dataRemainder;
address = address.add(BigInteger.valueOf(length));
}
if(fBufferPosition == fBuffer.length)
flush();
}
}
public void flush() throws DebugException
{
if(fBufferStart != null)
{
byte data[] = new byte[fBufferPosition];
System.arraycopy(fBuffer, 0, data, 0, fBufferPosition);
fBlock.setValue(fBufferStart, data);
fBufferStart = null;
}
}
}