/*
* 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 - 2013 Pentaho Corporation and Contributors. All rights reserved.
*/
package org.pentaho.reporting.libraries.fonts.encoding;
/**
* This is a wrapper around a byte buffer to allows streaming operations. This preserves my sanity, as managing arrays
* with irregular encodings is hell.
*
* @author Thomas Morgner
*/
public class ByteStream {
private ByteBuffer buffer;
private byte[] data;
private int writeCursor;
private int lastWritePos;
private int increment;
private int readCursor;
public ByteStream( final ByteBuffer buffer, final int increment ) {
if ( buffer == null ) {
throw new NullPointerException();
}
if ( increment < 1 ) {
throw new IllegalArgumentException();
}
this.buffer = buffer;
this.data = buffer.getData();
this.writeCursor = buffer.getCursor();
this.lastWritePos = data.length - 1;
this.increment = increment;
this.readCursor = buffer.getOffset();
}
public void put( final byte b ) {
if ( writeCursor >= lastWritePos ) {
this.buffer.ensureSize( writeCursor + increment );
this.data = buffer.getData();
this.lastWritePos = data.length - 1;
}
data[ writeCursor ] = b;
writeCursor += 1;
}
public void put( final byte[] b ) {
if ( writeCursor >= lastWritePos ) {
this.buffer.ensureSize( writeCursor + Math.max( increment, b.length ) );
this.data = buffer.getData();
this.lastWritePos = data.length - 1;
}
System.arraycopy( b, 0, data, writeCursor, b.length );
writeCursor += b.length;
}
public byte get() {
if ( readCursor < writeCursor ) {
final byte retval = data[ readCursor ];
readCursor += 1;
return retval;
} else {
return 0;
}
}
public void close() {
buffer.setCursor( writeCursor );
}
public int getReadSize() {
return ( writeCursor - readCursor );
}
}