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/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program 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 Lesser General Public License for more details.
*
* Copyright (c) 2006 - 2009 Pentaho Corporation and Contributors. All rights reserved.
*/
package org.pentaho.reporting.libraries.fonts.encoding;
import java.io.Serializable;
/**
* A simple byte buffer. The length specifies the fill level of the data-array.
*
* @author Thomas Morgner
*/
public class ByteBuffer implements Serializable
{
private byte[] data;
private int offset;
private int cursor;
public ByteBuffer(final int length)
{
if (length < 0)
{
throw new IllegalArgumentException();
}
this.data = new byte[length];
this.offset = 0;
this.cursor = 0;
}
public ByteBuffer(final byte[] data)
{
if (data == null)
{
throw new NullPointerException();
}
this.data = data;
this.offset = 0;
this.cursor = data.length;
}
public ByteBuffer(final byte[] data, final int offset, final int length)
{
if (length < 0)
{
throw new IndexOutOfBoundsException();
}
if (offset < 0)
{
throw new IndexOutOfBoundsException();
}
if (data == null)
{
throw new NullPointerException();
}
if ((length + offset) > data.length)
{
throw new IndexOutOfBoundsException();
}
this.data = data;
this.offset = offset;
this.cursor = offset + length;
}
public byte[] getData()
{
return data;
}
public void setData(final byte[] data, final int length, final int offset)
{
if (data == null)
{
throw new IllegalArgumentException();
}
if (length < 0)
{
throw new IndexOutOfBoundsException("Length < 0");
}
if (offset < 0)
{
throw new IllegalArgumentException("Offset < 0");
}
if (length + offset >= data.length)
{
throw new IllegalArgumentException("Length + Offset");
}
this.data = data;
this.cursor = length + offset;
this.offset = offset;
}
public int getLength()
{
return cursor - offset;
}
public int getOffset()
{
return offset;
}
public int getCursor()
{
return cursor;
}
public void ensureSize(final int length)
{
if (data.length < (offset + length))
{
final byte[] newdata = new byte[offset + length];
System.arraycopy(data, 0, newdata, 0, data.length);
data = newdata;
}
}
public void setCursor(final int cursor)
{
if (cursor < offset)
{
throw new IndexOutOfBoundsException();
}
if (cursor > data.length)
{
throw new IndexOutOfBoundsException();
}
this.cursor = cursor;
}
}
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