Source for javax.imageio.stream.FileImageInputStream

   1: /* FileImageInputStream.java --
   2:    Copyright (C) 2004  Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: 
  39: package javax.imageio.stream;
  40: 
  41: import java.io.File;
  42: import java.io.FileNotFoundException;
  43: import java.io.IOException;
  44: import java.io.RandomAccessFile;
  45: 
  46: /**
  47:  * @author Michael Koch (konqueror@gmx.de)
  48:  */
  49: public class FileImageInputStream extends ImageInputStreamImpl
  50: {
  51:   private RandomAccessFile file;
  52:   
  53:   public FileImageInputStream(File file)
  54:     throws FileNotFoundException, IOException
  55:   {
  56:     if (file == null)
  57:       throw new IllegalArgumentException ("file may not be null");
  58: 
  59:     this.file = new RandomAccessFile(file, "r");
  60:   }
  61: 
  62:   public FileImageInputStream(RandomAccessFile file)
  63:   {
  64:     if (file == null)
  65:       throw new IllegalArgumentException ("file may not be null");
  66: 
  67:     this.file = file;
  68:   }
  69: 
  70:   public void close()
  71:     throws IOException
  72:   {
  73:     file.close();
  74:   }
  75: 
  76:   public long length()
  77:   {
  78:     try
  79:       {
  80:         return file.length();
  81:       }
  82:     catch (IOException e)
  83:       {
  84:         return -1L;
  85:       }
  86:   }
  87: 
  88:   public int read()
  89:     throws IOException
  90:   {
  91:     setBitOffset(0);
  92:     return file.read();
  93:   }
  94: 
  95:   public int read(byte[] data, int offset, int len)
  96:     throws IOException
  97:   {
  98:     setBitOffset(0);
  99:     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: }