001/* ***** BEGIN LICENSE BLOCK *****
002 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
003 *
004 * The contents of this file are subject to the Mozilla Public License Version
005 * 1.1 (the "License"); you may not use this file except in compliance with
006 * the License. You may obtain a copy of the License at
007 * http://www.mozilla.org/MPL/
008 *
009 * Software distributed under the License is distributed on an "AS IS" basis,
010 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
011 * for the specific language governing rights and limitations under the
012 * License.
013 *
014 * The Original Code is part of dcm4che, an implementation of DICOM(TM) in
015 * Java(TM), hosted at https://github.com/gunterze/dcm4che.
016 *
017 * The Initial Developer of the Original Code is
018 * Agfa Healthcare.
019 * Portions created by the Initial Developer are Copyright (C) 2011
020 * the Initial Developer. All Rights Reserved.
021 *
022 * Contributor(s):
023 * See @authors listed below
024 *
025 * Alternatively, the contents of this file may be used under the terms of
026 * either the GNU General Public License Version 2 or later (the "GPL"), or
027 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
028 * in which case the provisions of the GPL or the LGPL are applicable instead
029 * of those above. If you wish to allow use of your version of this file only
030 * under the terms of either the GPL or the LGPL, and not to allow others to
031 * use your version of this file under the terms of the MPL, indicate your
032 * decision by deleting the provisions above and replace them with the notice
033 * and other provisions required by the GPL or the LGPL. If you do not delete
034 * the provisions above, a recipient may use your version of this file under
035 * the terms of any one of the MPL, the GPL or the LGPL.
036 *
037 * ***** END LICENSE BLOCK ***** */
038
039package org.dcm4che3.io;
040
041import java.io.IOException;
042import java.io.InputStream;
043import java.io.RandomAccessFile;
044
045/**
046 * @author Gunter Zeilinger <gunterze@gmail.com>
047 */
048public class RAFInputStreamAdapter extends InputStream {
049
050    private final RandomAccessFile raf;
051    private long markedPos;
052    private IOException markException;
053
054    public RAFInputStreamAdapter(RandomAccessFile raf) {
055        if (raf == null)
056            throw new NullPointerException();
057        this.raf = raf;
058    }
059
060    @Override
061    public int read() throws IOException {
062        return raf.read();
063    }
064
065    @Override
066    public int read(byte[] b, int off, int len) throws IOException {
067        return raf.read(b, off, len);
068    }
069
070    @Override
071    public long skip(long n) throws IOException {
072        return raf.skipBytes((int) n);
073    }
074
075    @Override
076    public synchronized void mark(int readlimit) {
077        try {
078            this.markedPos = raf.getFilePointer();
079            this.markException = null;
080        } catch (IOException e) {
081            this.markException = e;
082        }
083    }
084
085    @Override
086    public synchronized void reset() throws IOException {
087        if (markException != null)
088            throw markException;
089        raf.seek(markedPos);
090    }
091
092    @Override
093    public boolean markSupported() {
094        return true;
095    }
096}