KduCompressedSource.java

/*
 * Copyright (c) 2008  Los Alamos National Security, LLC.
 *
 * Los Alamos National Laboratory
 * Research Library
 * Digital Library Research & Prototyping Team
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 * 
 */

package gov.lanl.adore.djatoka.kdu.jni;

import kdu_jni.KduException;
import kdu_jni.Kdu_compressed_source_nonnative;
import kdu_jni.Kdu_global;

public class KduCompressedSource extends Kdu_compressed_source_nonnative {
	private byte[] b;
	int offset = 0;
	
	public KduCompressedSource(byte[] b) {
		this.b = b;
	}
	
	public int Get_capabilities() {
		return Kdu_global.KDU_SOURCE_CAP_SEQUENTIAL;
	}
	
	public int Post_read(int num_bytes) {
		try {
			Push_data(b, offset, num_bytes);
			offset = offset + num_bytes;
		} catch (KduException e) {
			e.printStackTrace();
		}
		return num_bytes;
	}
	
	public boolean Seek(long offset) {
		if (offset > -1 && offset <= b.length) {
		    this.offset = (int) offset;
		    return true;
		}
		return false;
	}
	
	public long Get_pos() {
		return offset;
	}
	
	public void close() {
		this.b = null;
	}
	
}