001/* FileImageInputStream.java --
002   Copyright (C) 2004  Free Software Foundation, Inc.
003
004This file is part of GNU Classpath.
005
006GNU Classpath is free software; you can redistribute it and/or modify
007it under the terms of the GNU General Public License as published by
008the Free Software Foundation; either version 2, or (at your option)
009any later version.
010
011GNU Classpath is distributed in the hope that it will be useful, but
012WITHOUT ANY WARRANTY; without even the implied warranty of
013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014General Public License for more details.
015
016You should have received a copy of the GNU General Public License
017along with GNU Classpath; see the file COPYING.  If not, write to the
018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
01902110-1301 USA.
020
021Linking this library statically or dynamically with other modules is
022making a combined work based on this library.  Thus, the terms and
023conditions of the GNU General Public License cover the whole
024combination.
025
026As a special exception, the copyright holders of this library give you
027permission to link this library with independent modules to produce an
028executable, regardless of the license terms of these independent
029modules, and to copy and distribute the resulting executable under
030terms of your choice, provided that you also meet, for each linked
031independent module, the terms and conditions of the license of that
032module.  An independent module is a module which is not derived from
033or based on this library.  If you modify this library, you may extend
034this exception to your version of the library, but you are not
035obligated to do so.  If you do not wish to do so, delete this
036exception statement from your version. */
037
038
039package javax.imageio.stream;
040
041import java.io.File;
042import java.io.FileNotFoundException;
043import java.io.IOException;
044import java.io.RandomAccessFile;
045
046/**
047 * @author Michael Koch (konqueror@gmx.de)
048 */
049public class FileImageInputStream extends ImageInputStreamImpl
050{
051  private RandomAccessFile file;
052  
053  public FileImageInputStream(File file)
054    throws FileNotFoundException, IOException
055  {
056    if (file == null)
057      throw new IllegalArgumentException ("file may not be null");
058
059    this.file = new RandomAccessFile(file, "r");
060  }
061
062  public FileImageInputStream(RandomAccessFile file)
063  {
064    if (file == null)
065      throw new IllegalArgumentException ("file may not be null");
066
067    this.file = file;
068  }
069
070  public void close()
071    throws IOException
072  {
073    file.close();
074  }
075
076  public long length()
077  {
078    try
079      {
080        return file.length();
081      }
082    catch (IOException e)
083      {
084        return -1L;
085      }
086  }
087
088  public int read()
089    throws IOException
090  {
091    setBitOffset(0);
092    return file.read();
093  }
094
095  public int read(byte[] data, int offset, int len)
096    throws IOException
097  {
098    setBitOffset(0);
099    return file.read(data, offset, len);
100  }
101
102  public void seek(long position)
103    throws IOException
104  {
105    super.seek(position);
106    file.seek(position);
107  }
108}