001    /* FileImageInputStream.java --
002       Copyright (C) 2004  Free Software Foundation, Inc.
003    
004    This file is part of GNU Classpath.
005    
006    GNU Classpath is free software; you can redistribute it and/or modify
007    it under the terms of the GNU General Public License as published by
008    the Free Software Foundation; either version 2, or (at your option)
009    any later version.
010    
011    GNU Classpath is distributed in the hope that it will be useful, but
012    WITHOUT ANY WARRANTY; without even the implied warranty of
013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014    General Public License for more details.
015    
016    You should have received a copy of the GNU General Public License
017    along with GNU Classpath; see the file COPYING.  If not, write to the
018    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019    02110-1301 USA.
020    
021    Linking this library statically or dynamically with other modules is
022    making a combined work based on this library.  Thus, the terms and
023    conditions of the GNU General Public License cover the whole
024    combination.
025    
026    As a special exception, the copyright holders of this library give you
027    permission to link this library with independent modules to produce an
028    executable, regardless of the license terms of these independent
029    modules, and to copy and distribute the resulting executable under
030    terms of your choice, provided that you also meet, for each linked
031    independent module, the terms and conditions of the license of that
032    module.  An independent module is a module which is not derived from
033    or based on this library.  If you modify this library, you may extend
034    this exception to your version of the library, but you are not
035    obligated to do so.  If you do not wish to do so, delete this
036    exception statement from your version. */
037    
038    
039    package javax.imageio.stream;
040    
041    import java.io.File;
042    import java.io.FileNotFoundException;
043    import java.io.IOException;
044    import java.io.RandomAccessFile;
045    
046    /**
047     * @author Michael Koch (konqueror@gmx.de)
048     */
049    public 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    }