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Smart Card Utils for Better Access.
There is a newer version: 0.0.20
/*
 * This file is part of the SCUBA smart card framework.
 *
 * 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 Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * Copyright (C) 2009 - 2015  The SCUBA team.
 *
 * $Id: AbstractFileSystemStructured.java 246 2015-04-09 08:13:52Z martijno $
 */

package net.sf.scuba.smartcards;


/**
 * This class implements some basic file selection / reading / writing 
 * routines from the  ISO7816-4 standard.
 * 
 * TODO: Work in heavy progress
 *  
 * @author woj
 * 
 * @version $Revision: 246 $
 */
public abstract class AbstractFileSystemStructured implements FileSystemStructured {

    public static short MF_ID = 0x3F00;
    
    private CardService service = null;
    private short selectedFID = 0;
    private int length = -1;
    private int p2 = 0;
    private int selectLe = 256;
    private ISOFileInfo fileInfo = null;
    
    public AbstractFileSystemStructured(CardService service) {
        this.service = service;
    }

    public AbstractFileSystemStructured(CardService service, boolean fileInfo) {
        this.service = service;
        this.p2 = fileInfo ? 0x00 : 0x0C;
        this.selectLe = fileInfo ? 256 : 0;
    }

    public int getFileLength() throws CardServiceException {
        return length;
    }

    public short getSelectedFID() {
        return selectedFID;
    }

    public abstract byte[] readBinary(int offset, int length);

    private void selectFile(byte[] data, int p1) throws CardServiceException {
        CommandAPDU command = createSelectFileAPDU(p1, p2, data, selectLe);
        ResponseAPDU response = service.transmit(command);
        
        int respSW = response.getSW();
        byte[] respData = response.getData();
        
        if( respSW != ISO7816.SW_NO_ERROR) {
            throw new CardServiceException("File could not be selected.", respSW);
        }
        // store selected fid:
        // 0, 4, 8 absolute
        // 1, 2, 9, relative
        // 3 parent
        this.fileInfo = new ISOFileInfo( respData );
        if(this.fileInfo.fid != -1) {
            selectedFID = this.fileInfo.fid;
        }
        if(this.fileInfo.fileLength != -1) {
            length = this.fileInfo.fileLength;
        }
    }

    private void selectFile(short fid, int p1) throws CardServiceException {
        byte[] fidbytes = (fid == 0) ? new byte[0] : new byte[]{ (byte) ((fid >> 8) & 0x000000FF), (byte) (fid & 0x000000FF) };
        selectFile(fidbytes, p1);
    }
    
    public void selectFile(short fid) throws CardServiceException {
        selectFile(fid, 0x00);
    }

    public void selectMF() throws CardServiceException {
        selectFile((short)0, 0);
    }

    public void selectParent() throws CardServiceException {
        selectFile((short)0, 0x03);
    }
    
    public void selectEFRelative(short fid) throws CardServiceException {
        selectFile(fid, 0x02);
    }
    
    public void selectDFRelative(short fid) throws CardServiceException {
        selectFile(fid, 0x01);        
    }

    public void selectAID(byte[] aid) throws CardServiceException {
        selectFile(aid, 0x04);
    } 
    
    public void selectPath(byte[] path) throws CardServiceException {
        selectFile(path, 0x08);
    } 

    public void selectPathRelative(byte[] path) throws CardServiceException {
        selectFile(path, 0x09);        
    } 
    
    private CommandAPDU createSelectFileAPDU(int p1, int p2, byte[] data, int le) {
    	if( le == 0)
    		return new CommandAPDU( ISO7816.CLA_ISO7816, ISO7816.INS_SELECT_FILE, p1, p2, data );
    		//return new CommandAPDU(ISO7816.CLA_ISO7816, ISO7816.INS_SELECT_FILE, p1, p2, data);
        else
        	//return new CommandAPDU(ISO7816.CLA_ISO7816, ISO7816.INS_SELECT_FILE, p1, p2, data, le);
        	return new CommandAPDU(ISO7816.CLA_ISO7816, ISO7816.INS_SELECT_FILE, p1, p2, data, le);
    }

}