/*
 * File    : FilePCC.java
 * Created : 12-jul-2000 12:30
 * By      : fbusquets
 *
 * JClic - Authoring and playing system for educational activities
 *
 * Copyright (C) 2000 - 2005 Francesc Busquets & Departament
 * d'Educacio de la Generalitat de Catalunya                                        
 *
 * This program 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 of the License, or
 * (at your option) any later version.
 *
 * 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 General Public License for more details (see the LICENSE file).
 */

package edu.xtec.jclic.fileSystem;

import edu.xtec.util.ResourceBridge;
import java.io.*;

/**
 *
 * @author Francesc Busquets (fbusquets@xtec.cat)
 * @version 13.08.28
 */
public class FilePCC extends PCCFileSystem {
    
    RandomAccessFile raf;
    
    public FilePCC(String rootPath, String fName, ResourceBridge rb) throws Exception {
        super(rootPath, fName, rb);
        open();
    }
    
    @Override
    protected void open() throws Exception{
        if(raf==null){
            DataInputStream dis=super.getDataInputStream(pccName);
            initPCC(dis);
            dis.close();
            raf=new RandomAccessFile(sysFn(getCanonicalNameOf(root + pccName)), "r");
        }
    }
    
    protected byte[] getBytes(int entryNum) throws IOException {
        long fileSize=fe[entryNum].size;
        byte[] b=new byte[(int)fileSize];
        raf.seek(fe[entryNum].offset);
        for(long k=0; k<fileSize;)
            k+=raf.read(b, (int)k, (int)(fileSize-k));
        return b;
    }
    
    @Override
    protected void changeBase(String newRoot, String newFileName) throws Exception{
        if(raf!=null)
            throw new Exception("Unable to change base fileName: FileSystem is open!");
        super.changeBase(newRoot, newFileName);
        pccName = getCanonicalNameOf(newFileName);        
    }
    
    @Override
    public void close(){
        if(raf!=null){
            try{
                raf.close();
            } catch(Exception ex){
                // eat exception
            }
            raf=null;
        }
        super.close();
    }
}