Source for gnu.javax.imageio.png.PNGICCProfile

   1: /* PNGICCProfile.java --
   2:    Copyright (C) 2006 Free Software Foundation
   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: package gnu.javax.imageio.png;
  39: 
  40: import java.awt.color.ICC_Profile;
  41: import java.awt.color.ICC_ColorSpace;
  42: import java.awt.color.ColorSpace;
  43: import java.io.UnsupportedEncodingException;
  44: import java.io.IOException;
  45: import java.io.ByteArrayInputStream;
  46: import java.util.zip.InflaterInputStream;
  47: import java.util.zip.Deflater;
  48: 
  49: /**
  50:  * A PNG iCCP (ICC Profile) chunk.
  51:  */
  52: public class PNGICCProfile extends PNGChunk 
  53: { 
  54:   private String name;
  55:   private ICC_Profile profile;
  56:   // A generic profile name to use "ICC Profile"
  57:   private static final byte[] genericName = new byte[]
  58:   { 0x49, 0x43, 0x43, 0x20, 0x50, 0x72, 0x6f, 0x66, 0x69, 0x6c, 0x65 };
  59:   
  60:   protected PNGICCProfile( int type, byte[] data, int crc ) throws PNGException
  61:   {
  62:     super( type, data, crc );
  63:     int i = 0;
  64:     while( data[i++] != 0 );
  65:     try
  66:       {
  67:     name = new String(data, 0, i, "8859_1");
  68:       }
  69:     catch(UnsupportedEncodingException e)
  70:       {
  71:     name = ""; // shouldn't really happen.
  72:       }
  73:     if( data[i++] != 0 )
  74:       throw new PNGException("Can't handle nonzero compression types with iCCP chunks.");
  75:     try
  76:       {
  77:     ByteArrayInputStream bos = new ByteArrayInputStream( data, i, 
  78:                                  data.length - i );
  79:     profile = ICC_Profile.getInstance( new InflaterInputStream( bos ) );
  80:       }
  81:     catch(IOException ioe)
  82:       {
  83:     throw new PNGException("Couldn't read iCCP profile chunk.");
  84:       }
  85:     System.out.println("Got profile:"+profile);
  86:   }
  87: 
  88:   public PNGICCProfile( ICC_Profile profile )
  89:   {
  90:     super( TYPE_PROFILE );
  91:     this.profile = profile;
  92:     byte[] profData = profile.getData();
  93:     byte[] outData = new byte[ profData.length * 2 ];
  94:     Deflater deflater = new Deflater();
  95:     deflater.setInput( profData );
  96:     deflater.finish();
  97:     int n = deflater.deflate( outData );
  98:     data = new byte[ n + 11 + 2 ];
  99:     System.arraycopy(genericName, 0, data, 0, 11 );
 100:     data[11] = data[12] = 0; // null separator and compression type.
 101:     // Copy compressed data
 102:     System.arraycopy(outData, 0, data, 13, n );
 103:   }
 104: 
 105:   public ColorSpace getColorSpace()
 106:   {
 107:     return new ICC_ColorSpace( profile );
 108:   }
 109: 
 110:   public String toString()
 111:   {
 112:     return "PNG ICC Profile, name: "+name;
 113:   }
 114: }