obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.

15 files changed, 2625 insertions, 0 deletions

diff --git a/libjava/classpath/gnu/javax/imageio/png/PNGChunk.java b/libjava/classpath/gnu/javax/imageio/png/PNGChunk.java
new file mode 100644
index 000000000..ade0999fe
--- /dev/null
+++ b/libjava/classpath/gnu/javax/imageio/png/PNGChunk.java
@@ -0,0 +1,283 @@
+/* PNGChunk.java -- Generic PNG chunk
+   Copyright (C) 2006 Free Software Foundation
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.javax.imageio.png;
+
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.IOException;
+
+/**
+ * Class to load and validate a generic PNG chunk.
+ */
+public class PNGChunk
+{
+
+  /**
+   * CRC table and initialization code.
+   */
+  private static long[] crcTable;
+
+  static
+   {
+     long c;
+     crcTable = new long[256];
+
+     for(int i = 0; i < 256; i++)
+       {
+         c = i;
+         for(int j = 0; j < 8; j++)
+           if( (c & 1) == 1 )
+             c = 0xEDB88320L ^ (c >> 1);
+           else
+             c = c >> 1;
+         crcTable[i] = c;
+       }
+   }
+
+  /**
+   * (recognized) PNG chunk types.
+   */
+  public static final int TYPE_HEADER = 0x49484452; // 'IHDR'
+  public static final int TYPE_PALETTE = 0x504c5445;// 'PLTE'
+  public static final int TYPE_DATA = 0x49444154;   // 'IDAT'
+  public static final int TYPE_TIME = 0x74494d45;   // 'tIME'
+  public static final int TYPE_END = 0x49454e44;    // 'IEND'
+  public static final int TYPE_PHYS = 0x70485973;   // 'pHYS'
+  public static final int TYPE_GAMMA = 0x67414d41;  // 'gAMA'
+  public static final int TYPE_PROFILE = 0x69434350;  // 'iCCP'
+
+  /**
+   * The chunk type - Represented in the file as 4 ASCII bytes,
+   */
+  private int type;
+
+  /**
+   * The chunk data
+   */
+  protected byte[] data;
+
+  /**
+   * The chunk's crc
+   */
+  private int crc;
+
+  /**
+   * Constructor for reading a generic chunk.
+   */
+  protected PNGChunk( int type, byte[] data, int crc )
+  {
+    this.type = type;
+    this.data = data;
+    this.crc = crc;
+  }
+
+  /**
+   * Constructor for creating new chunks.
+   * (only used by subclasses - creating a generic chunk is rather useless)
+   */
+  protected PNGChunk( int type )
+  {
+    this.type = type;
+  }
+
+  /**
+   * Loads a chunk from an InputStream. Does not perform validation,
+   * but will throw an IOException if the read fails.
+   * @param in - th einputstream to read from
+   * @param strict - if true, a PNGException is thrown on all invalid chunks,
+   * if false, only critical chunks will throw PNGExceptions.
+   */
+  public static PNGChunk readChunk(InputStream in, boolean strict)
+    throws IOException, PNGException
+  {
+    byte data[] = new byte[4];
+    if( in.read( data ) != 4 )
+      throw new IOException("Could not read chunk length.");
+    int length = ((data[0] & 0xFF) << 24) | ((data[1] & 0xFF) << 16 ) |
+      ((data[2] & 0xFF) << 8) | (data[3] & 0xFF);
+
+    if( in.read( data ) != 4 )
+      throw new IOException("Could not read chunk type.");
+    int type = ((data[0] & 0xFF) << 24) | ((data[1] & 0xFF) << 16 ) |
+      ((data[2] & 0xFF) << 8) | (data[3] & 0xFF);
+
+    byte[] chkdata = new byte[ length ];
+    if( in.read( chkdata ) != length )
+      throw new IOException("Could not read chunk data.");
+
+    if( in.read( data ) != 4 )
+      throw new IOException("Could not read chunk CRC.");
+
+    int crc = ((data[0] & 0xFF) << 24) | ( (data[1] & 0xFF) << 16 ) |
+      ((data[2] & 0xFF) << 8) | (data[3] & 0xFF);
+
+    if( strict )
+      return getChunk( type, chkdata, crc );
+    else
+      {
+        try
+          {
+            return getChunk( type, chkdata, crc );
+          }
+        catch(PNGException pnge)
+          {
+            if( isEssentialChunk( type ) )
+              throw pnge;
+            return null;
+          }
+      }
+  }
+
+  /**
+   * Returns a specialied object for a chunk, if we have one.
+   */
+  private static PNGChunk getChunk( int type, byte[] data, int crc )
+    throws PNGException
+  {
+    switch( type )
+      {
+      case TYPE_HEADER:
+        return new PNGHeader( type, data, crc );
+      case TYPE_DATA:
+        return new PNGData( type, data, crc );
+      case TYPE_PALETTE:
+        return new PNGPalette( type, data, crc );
+      case TYPE_TIME:
+        return new PNGTime( type, data, crc );
+      case TYPE_PHYS:
+        return new PNGPhys( type, data, crc );
+      case TYPE_GAMMA:
+        return new PNGGamma( type, data, crc );
+      case TYPE_PROFILE:
+        return new PNGICCProfile( type, data, crc );
+      default:
+        return new PNGChunk( type, data, crc );
+      }
+  }
+
+  /**
+   * Returns whether the chunk is essential or not
+   */
+  private static boolean isEssentialChunk( int type )
+  {
+    switch( type )
+      {
+      case TYPE_HEADER:
+      case TYPE_DATA:
+      case TYPE_PALETTE:
+      case TYPE_END:
+        return true;
+      default:
+        return false;
+      }
+  }
+
+  /**
+   * Validates the chunk
+   */
+  public boolean isValidChunk()
+  {
+    return (crc == calcCRC());
+  }
+
+  /**
+   * Returns the chunk type.
+   */
+  public int getType()
+  {
+    return type;
+  }
+
+  /**
+   * Writes a PNG chunk to an output stream,
+   * performing the CRC calculation as well.
+   */
+  public void writeChunk(OutputStream out) throws IOException
+  {
+    out.write( getInt(data.length) );
+    out.write( getInt(type) );
+    out.write( data );
+    out.write( getInt(calcCRC()) );
+  }
+
+  /**
+   * Return whether the chunk contains any data.
+   */
+  public boolean isEmpty()
+  {
+    return ( data.length == 0 );
+  }
+
+  /**
+   * Convenience method. Cast an int to four bytes (big endian).
+   * (Now why doesn't java have a simple way of doing this?)
+   */
+  public static byte[] getInt(int intValue)
+  {
+    long i = (intValue & 0xFFFFFFFFL);
+    byte[] b = new byte[4];
+    b[0] = (byte)((i & 0xFF000000L) >> 24);
+    b[1] = (byte)((i & 0x00FF0000L) >> 16);
+    b[2] = (byte)((i & 0x0000FF00L) >> 8);
+    b[3] = (byte)(i & 0x000000FFL);
+    return b;
+  }
+
+  /**
+   * Calculates this chunk's CRC value.
+   */
+  private int calcCRC()
+  {
+    long c = 0xFFFFFFFFL;
+    byte[] t = getInt( type );
+    for(int i = 0; i < 4; i++)
+      c = crcTable[ (int)((c ^ t[i]) & 0xFF) ] ^ (c >> 8);
+
+    for(int i = 0; i < data.length; i++)
+      c = crcTable[ (int)((c ^ data[i]) & 0xFF) ] ^ (c >> 8);
+
+    return (int)(c ^ 0xFFFFFFFFL);
+  }
+
+  public String toString()
+  {
+    return "PNG Chunk. Type: " + new String( getInt(type) ) + " , CRC: " +
+      crc + " , calculated CRC: "+calcCRC();
+  }
+
+}
diff --git a/libjava/classpath/gnu/javax/imageio/png/PNGData.java b/libjava/classpath/gnu/javax/imageio/png/PNGData.java
new file mode 100644
index 000000000..08d765f66
--- /dev/null
+++ b/libjava/classpath/gnu/javax/imageio/png/PNGData.java
@@ -0,0 +1,104 @@
+/* PNGData.java -- PNG IDAT chunk.
+   Copyright (C) 2006 Free Software Foundation
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.javax.imageio.png;
+
+import java.util.zip.Inflater;
+import java.util.zip.Deflater;
+
+/**
+ * A PNG IDAT (data) chunk.
+ */
+public class PNGData extends PNGChunk
+{
+  private int offset;
+
+  protected PNGData( int type, byte[] data, int crc )
+  {
+    super( type, data, crc );
+  }
+
+  protected PNGData( int chunkSize )
+  {
+    super( PNGChunk.TYPE_DATA );
+    data = new byte[ chunkSize ];
+    offset = 0;
+  }
+
+  /**
+   * Deflates the available data in def to the chunk.
+   *
+   * @return true if the chunk is filled and no more data can be written,
+   * false otherwise.
+   */
+  public void deflateToChunk( Deflater def )
+  {
+    offset += def.deflate( data, offset, data.length - offset );
+  }
+
+  /**
+   * Returns true if the chunk is filled.
+   */
+  public boolean chunkFull()
+  {
+    return (offset >= data.length);
+  }
+
+  /**
+   * Shrink the chunk to offset size, used for the last chunk in a stream
+   * (no trailing data!)
+   */
+  public void shrink()
+  {
+    byte[] newData = new byte[ offset ];
+    System.arraycopy( data, 0, newData, 0, offset );
+    data = newData;
+  }
+
+  /**
+   * Feeds the data in the chunk to a ZIP inflater object.
+   */
+  public void feedToInflater( Inflater inf )
+  {
+    inf.setInput( data );
+  }
+
+  public String toString()
+  {
+    return "PNG Data chunk. Length = "+data.length;
+  }
+}
diff --git a/libjava/classpath/gnu/javax/imageio/png/PNGDecoder.java b/libjava/classpath/gnu/javax/imageio/png/PNGDecoder.java
new file mode 100644
index 000000000..4481107c4
--- /dev/null
+++ b/libjava/classpath/gnu/javax/imageio/png/PNGDecoder.java
@@ -0,0 +1,331 @@
+/* PNGDecoder.java
+   Copyright (C) 2006 Free Software Foundation
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.javax.imageio.png;
+
+import java.util.zip.Inflater;
+import java.util.zip.DataFormatException;
+import java.awt.image.ColorModel;
+import java.awt.image.ComponentColorModel;
+import java.awt.image.ComponentSampleModel;
+import java.awt.image.DataBuffer;
+import java.awt.image.DataBufferByte;
+import java.awt.image.DataBufferUShort;
+import java.awt.image.IndexColorModel;
+import java.awt.image.MultiPixelPackedSampleModel;
+import java.awt.image.Raster;
+import java.awt.image.SampleModel;
+import java.awt.image.SinglePixelPackedSampleModel;
+import java.awt.image.WritableRaster;
+import java.awt.color.ColorSpace;
+
+public class PNGDecoder
+{
+  private PNGHeader header;
+  private byte[] raster;
+  private byte[] scanline, lastScanline;
+  private byte[] filterType;
+  private int offset, length;
+  private int currentScanline;
+  private final int stride;
+  private Inflater inflater;
+  private boolean readFilter;
+  private int bpp; // bytes per pixel
+
+  /**
+   * Constructs a filter object for
+   */
+  public PNGDecoder(PNGHeader header)
+  {
+    this.header = header;
+    offset = 0;
+    inflater = new Inflater();
+    stride = header.getScanlineStride();
+    length = stride * header.getHeight();
+
+    // Allocate the output raster
+    raster = new byte[ length ];
+    scanline = new byte[ stride ];
+    lastScanline = new byte[ stride ];
+    currentScanline = 0;
+    readFilter = true;
+    bpp = header.bytesPerPixel();
+    filterType = new byte[1];
+    inflater = new Inflater();
+  }
+
+  private int getBytes( byte[] buf, int offset ) throws PNGException
+  {
+    try
+      {
+        return inflater.inflate( buf, offset, buf.length - offset);
+      }
+    catch(DataFormatException dfe)
+      {
+        throw new PNGException("Error inflating data.");
+      }
+  }
+
+  /**
+   * Decodes a data chunk.
+   */
+  public void addData( PNGData chunk ) throws PNGException
+  {
+    int n = 0;
+    if( isFinished() )
+      return;
+    chunk.feedToInflater( inflater );
+    do
+      {
+        if( readFilter )
+          if( getBytes( filterType, 0 ) < 1 )
+            return;
+
+        n = getBytes( scanline, offset );
+
+        if( offset + n < stride )
+          {
+            offset += n;
+            readFilter = false;
+          }
+        else
+          {
+            scanline = PNGFilter.unFilterScanline( filterType[0], scanline,
+                                                   lastScanline, bpp );
+            System.arraycopy( scanline, 0,
+                              raster, currentScanline * stride, stride );
+            lastScanline = scanline;
+            scanline = new byte[scanline.length];
+            currentScanline++;
+            readFilter = true;
+            offset = 0;
+          }
+      }
+    while( n > 0 && currentScanline < header.getHeight() );
+  }
+
+  /**
+   * Parse the appropriate color type and create an AWT raster for it.
+   * @param header - the file header.
+   */
+  public WritableRaster getRaster( PNGHeader header )
+  {
+    SampleModel sm = null;
+    DataBuffer db = null;
+    int t;
+    int width = header.getWidth();
+    int height = header.getHeight();
+    int depth = header.getDepth();
+
+    switch( header.getColorType() )
+      {
+      case PNGHeader.GRAYSCALE_WITH_ALPHA:
+        if( depth == 8 )
+          {
+            t = DataBuffer.TYPE_BYTE;
+            db = getByteBuffer();
+          }
+        else
+          {
+            t = DataBuffer.TYPE_USHORT;
+            db = getShortBuffer();
+          }
+        sm = new ComponentSampleModel(t, width, height, 2, width * 2,
+                                      new int[]{0, 1});
+        break;
+
+      case PNGHeader.GRAYSCALE:
+        switch( depth )
+          {
+          case 16:
+            sm = new ComponentSampleModel(DataBuffer.TYPE_USHORT,
+                                          width, height, 1, width,
+                                          new int[]{ 0 });
+            db = getShortBuffer();
+            break;
+
+          case 8:
+            sm = new ComponentSampleModel(DataBuffer.TYPE_BYTE,
+                                          width, height, 1, width,
+                                          new int[]{ 0 });
+            db = getByteBuffer();
+            break;
+
+          default:
+            sm = new MultiPixelPackedSampleModel(DataBuffer.TYPE_BYTE,
+                                                 width, height, depth);
+            db = getByteBuffer();
+            break;
+          }
+        break;
+
+      case PNGHeader.RGB:
+        if( depth == 8 )
+          {
+            t = DataBuffer.TYPE_BYTE;
+            db = getByteBuffer();
+          }
+        else
+          {
+            t = DataBuffer.TYPE_USHORT;
+            db = getShortBuffer();
+          }
+        sm = new ComponentSampleModel(t, width, height, 3, 3 * width,
+                                      new int[]{0, 1, 2});
+        break;
+
+      case PNGHeader.RGB_WITH_ALPHA:
+        if( depth == 8 )
+          {
+            t = DataBuffer.TYPE_BYTE;
+            db = getByteBuffer();
+          }
+        else
+          {
+            t = DataBuffer.TYPE_USHORT;
+            db = getShortBuffer();
+          }
+
+        sm = new ComponentSampleModel(t, width, height, 4, width * 4,
+                                      new int[]{0, 1, 2, 3});
+        break;
+
+      case PNGHeader.INDEXED:
+        if( depth == 8 )
+          sm = new SinglePixelPackedSampleModel(DataBuffer.TYPE_BYTE,
+                                                width, height,
+                                                new int[] {0xFF});
+        else
+          sm = new MultiPixelPackedSampleModel(DataBuffer.TYPE_BYTE,
+                                               width, height, depth);
+        db = getByteBuffer();
+        break;
+      }
+
+    return Raster.createWritableRaster(sm, db, null);
+  }
+
+  /**
+   * Wrap the raster with a DataBufferUShort,
+   * conversion is big-endian (PNG native).
+   */
+  private DataBuffer getShortBuffer()
+  {
+    short[] data = new short[(raster.length >> 1)];
+    for( int i = 0; i < data.length; i++ )
+      data[i] = (short)(((raster[i * 2] & 0xFF) << 8) |
+                        (raster[i * 2 + 1] & 0xFF));
+    return new DataBufferUShort( data, data.length );
+  }
+
+  /**
+   * Wrap the raster with a DataBufferByte
+   */
+  private DataBuffer getByteBuffer()
+  {
+    return new DataBufferByte( raster, raster.length );
+  }
+
+  public ColorModel getColorModel( ColorSpace cs,
+                                   int colorType, int depth )
+  {
+    int[] bits;
+    boolean hasAlpha = false;
+    int transferType;
+
+    switch( colorType )
+      {
+      case PNGHeader.GRAYSCALE_WITH_ALPHA:
+        if( cs == null )
+          cs = ColorSpace.getInstance( ColorSpace.CS_GRAY );
+        hasAlpha = true;
+        bits = new int[]{ depth, depth };
+        break;
+
+      case PNGHeader.RGB:
+        bits = new int[]{ depth, depth, depth };
+        break;
+
+      case PNGHeader.RGB_WITH_ALPHA:
+        hasAlpha = true;
+        bits = new int[]{ depth, depth, depth, depth };
+        break;
+
+      case PNGHeader.GRAYSCALE:
+        if( depth < 8 )
+          return grayPalette( depth );
+
+        if( cs == null )
+          cs = ColorSpace.getInstance( ColorSpace.CS_GRAY );
+        bits = new int[]{ depth };
+        break;
+
+      default:
+      case PNGHeader.INDEXED:
+        return null; // Handled by the palette chunk.
+      }
+
+    if( cs == null )
+      cs = ColorSpace.getInstance( ColorSpace.CS_sRGB );
+
+
+    return new ComponentColorModel(cs, bits, hasAlpha, false,
+                                   (hasAlpha ?
+                                    ComponentColorModel.TRANSLUCENT :
+                                    ComponentColorModel.OPAQUE),
+                                   ((depth == 16) ? DataBuffer.TYPE_USHORT :
+                                    DataBuffer.TYPE_BYTE));
+  }
+
+  private IndexColorModel grayPalette(int depth)
+  {
+    byte[] c = new byte[ (1 << depth) ];
+    for(int i = 0; i < c.length; i++)
+      c[i] = (byte)(255.0 * (((double)i) / ((double)c.length - 1.0)));
+    return new IndexColorModel(8, c.length, c, c, c);
+  }
+
+  public byte[] getRaster()
+  {
+    return raster;
+  }
+
+  public boolean isFinished()
+  {
+    return currentScanline >= header.getHeight();
+  }
+}
diff --git a/libjava/classpath/gnu/javax/imageio/png/PNGEncoder.java b/libjava/classpath/gnu/javax/imageio/png/PNGEncoder.java
new file mode 100644
index 000000000..b31787635
--- /dev/null
+++ b/libjava/classpath/gnu/javax/imageio/png/PNGEncoder.java
@@ -0,0 +1,233 @@
+/* PNGEncoder.java --
+   Copyright (C) 2006 Free Software Foundation
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.javax.imageio.png;
+
+import java.util.Vector;
+import java.util.zip.Deflater;
+import java.awt.color.ColorSpace;
+import java.awt.color.ICC_ColorSpace;
+import java.awt.image.BufferedImage;
+import java.awt.image.ColorModel;
+import java.awt.image.DataBuffer;
+import java.awt.image.DataBufferByte;
+import java.awt.image.DataBufferUShort;
+import java.awt.image.IndexColorModel;
+import java.awt.image.WritableRaster;
+
+public class PNGEncoder
+{
+  /**
+   * The default data chunk size. 8 kb.
+   */
+  private static final int defaultChunkSize = 8192;
+
+  private PNGHeader header;
+  private PNGPalette palette;
+  private int stride, bpp;
+  private byte[] rawData;
+  private PNGICCProfile profile;
+
+  public PNGEncoder( BufferedImage bi ) throws PNGException
+  {
+    ColorModel c = bi.getColorModel();
+    int width = bi.getWidth();
+    int height = bi.getHeight();
+    int depth = 0;
+    int colorType;
+    boolean interlace = false;
+
+    if( c instanceof IndexColorModel )
+      {
+        colorType = PNGHeader.INDEXED;
+        int n = ((IndexColorModel)c).getMapSize();
+        if( n <= 2 )
+          depth = 1;
+        else if( n <= 4 )
+          depth = 2;
+        else if( n <= 16 )
+          depth = 4;
+        else if( n <= 256 )
+          depth = 8;
+        else
+          throw new PNGException("Depth must be <= 8 bits for indexed color.");
+        palette = new PNGPalette( ((IndexColorModel)c) );
+      }
+    else
+      {
+        ColorSpace cs = c.getColorSpace();
+        ColorSpace grayCS = ColorSpace.getInstance( ColorSpace.CS_GRAY );
+        if( cs == grayCS || bi.getType() == BufferedImage.TYPE_BYTE_GRAY
+            || bi.getType() == BufferedImage.TYPE_USHORT_GRAY )
+          colorType = c.hasAlpha() ? PNGHeader.GRAYSCALE_WITH_ALPHA :
+            PNGHeader.GRAYSCALE;
+        else
+          colorType = c.hasAlpha() ? PNGHeader.RGB_WITH_ALPHA : PNGHeader.RGB;
+        // Figure out the depth
+        int[] bits = c.getComponentSize();
+        depth = bits[0];
+        for(int i = 1; i < bits.length; i++ )
+          if( bits[i] > depth ) depth = bits[i];
+        if( (cs != grayCS && !cs.isCS_sRGB()) && cs instanceof ICC_ColorSpace )
+          profile = new PNGICCProfile( ((ICC_ColorSpace)cs).getProfile() );
+      }
+
+    header = new PNGHeader(width, height, depth, colorType, interlace);
+
+    stride = header.getScanlineStride(); // scanline stride
+    bpp = header.bytesPerPixel(); // bytes per pixel
+    getRawData( bi );
+  }
+
+  /**
+   * Returns the generated header.
+   */
+  public PNGHeader getHeader()
+  {
+    return header;
+  }
+
+  /**
+   * Returns the generated palette.
+   */
+  public PNGPalette getPalette()
+  {
+    return palette;
+  }
+
+  /**
+   * Returns the associated ICC profile, if any.
+   */
+  public PNGICCProfile getProfile()
+  {
+    return profile;
+  }
+
+  /**
+   * Encodes the raster and returns a Vector of PNGData chunks.
+   */
+  public Vector encodeImage()
+  {
+    Deflater deflater = new Deflater(); // The deflater
+    boolean useFilter = PNGFilter.useFilter( header );
+    byte[] lastScanline = new byte[ stride ];
+
+    byte[] data = new byte[ rawData.length + header.getHeight() ];
+
+    byte filterByte = PNGFilter.FILTER_NONE;
+    for( int i = 0; i < header.getHeight(); i++)
+      {
+        byte[] scanline = new byte[ stride ];
+        System.arraycopy(rawData, (i * stride), scanline, 0, stride);
+        if( useFilter && i > 0)
+          filterByte = PNGFilter.chooseFilter( scanline, lastScanline, bpp);
+
+        byte[] filtered = PNGFilter.filterScanline( filterByte, scanline,
+                                                    lastScanline, bpp );
+        data[i * (stride + 1)] = filterByte;
+        System.arraycopy(filtered, 0, data, 1 + (i * (stride + 1)), stride);
+
+        lastScanline = scanline;
+      }
+
+    deflater.setInput( data );
+    deflater.finish();
+
+    PNGData chunk;
+    Vector chunks = new Vector();
+    do
+      {
+        chunk = new PNGData( defaultChunkSize );
+        chunk.deflateToChunk( deflater );
+        chunks.add( chunk );
+      }
+    while( chunk.chunkFull() );
+    chunk.shrink(); // Shrink the last chunk.
+    return chunks;
+  }
+
+  /**
+   * Get the image's raw data.
+   * FIXME: This may need improving on.
+   */
+  private void getRawData( BufferedImage bi ) throws PNGException
+  {
+    WritableRaster raster = bi.getRaster();
+    rawData = new byte[ stride * header.getHeight() ];
+    if( header.isIndexed() )
+      {
+        DataBuffer db = raster.getDataBuffer();
+        if( !( db instanceof DataBufferByte ) )
+          throw new PNGException("Unexpected DataBuffer for an IndexColorModel.");
+        byte[] data = ((DataBufferByte)db).getData();
+        for(int i = 0; i < header.getHeight(); i++ )
+          System.arraycopy( data, i * stride, rawData, i * stride, stride );
+        return;
+      }
+
+    if( header.getDepth() == 16 )
+      {
+        DataBuffer db = raster.getDataBuffer();
+        if( !( db instanceof DataBufferUShort ) )
+          throw new PNGException("Unexpected DataBuffer for 16-bit.");
+        short[] data = ((DataBufferUShort)db).getData();
+        for(int i = 0; i < header.getHeight(); i++ )
+          for(int j = 0; j < ( stride >> 1); j++)
+            {
+              rawData[ j * 2 + i * stride ] = (byte)((data[j + i * (stride >> 1 )] & 0xFF00) >> 8);
+              rawData[ j * 2 + i * stride + 1 ] = (byte)(data[j + i * (stride >> 1 )] & 0xFF);
+            }
+        return;
+      }
+
+    int size = ( header.getColorType() == PNGHeader.RGB_WITH_ALPHA ) ? 4 : 3;
+    int width = header.getWidth();
+    int height = header.getHeight();
+    int[] pixels = bi.getRGB( 0, 0, width, height, null, 0, width );
+
+    for( int i = 0; i < width * height; i++ )
+      {
+        rawData[ i * size ] = (byte)((pixels[i] & 0xFF0000) >> 16);
+        rawData[ i * size + 1 ] = (byte)((pixels[i] & 0xFF00) >> 8);
+        rawData[ i * size + 2 ] = (byte)(pixels[i] & 0xFF);
+      }
+
+    if( size == 4 )
+      for( int i = 0; i < width * height; i++ )
+        rawData[ i * size + 3 ] = (byte)((pixels[i] & 0xFF000000) >> 24);
+  }
+}
diff --git a/libjava/classpath/gnu/javax/imageio/png/PNGException.java b/libjava/classpath/gnu/javax/imageio/png/PNGException.java
new file mode 100644
index 000000000..ef5342cf8
--- /dev/null
+++ b/libjava/classpath/gnu/javax/imageio/png/PNGException.java
@@ -0,0 +1,48 @@
+/* PNGException.java --
+   Copyright (C) 2006 Free Software Foundation
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.javax.imageio.png;
+
+import java.io.IOException;
+
+public class PNGException extends IOException
+{
+  public PNGException(String msg)
+  {
+    super( msg );
+  }
+}
diff --git a/libjava/classpath/gnu/javax/imageio/png/PNGFile.java b/libjava/classpath/gnu/javax/imageio/png/PNGFile.java
new file mode 100644
index 000000000..76154cc66
--- /dev/null
+++ b/libjava/classpath/gnu/javax/imageio/png/PNGFile.java
@@ -0,0 +1,257 @@
+/* PNGFile.java -- High-level representation of a PNG file.
+   Copyright (C) 2006 Free Software Foundation
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.javax.imageio.png;
+
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.IOException;
+import java.util.Vector;
+import java.awt.image.BufferedImage;
+import java.awt.image.WritableRaster;
+import java.awt.image.ColorModel;
+import java.awt.color.ColorSpace;
+
+public class PNGFile
+{
+  /**
+   * The PNG file signature.
+   */
+  private static final byte[] signature = new byte[]
+  { (byte)137, 80, 78, 71, 13, 10, 26, 10 };
+
+  /**
+   * The end chunk in raw form, no need for anything fancy here, it's just
+   * 0 bytes of length, the "IEND" tag and its CRC.
+   */
+  private static final byte[] endChunk = new byte[]
+  { 0, 0, 0, 0, (byte)0x49, (byte)0x45, (byte)0x4E, (byte)0x44,
+    (byte)0xAE, (byte)0x42, (byte)0x60, (byte)0x82 };
+
+  /**
+   * The loaded data.
+   */
+  private Vector chunks;
+
+  /**
+   * The Header chunk
+   */
+  private PNGHeader header;
+
+  /**
+   * Whether this file has a palette chunk or not.
+   */
+  private boolean hasPalette;
+
+  /**
+   * Image width and height.
+   */
+  private int width, height;
+
+  /**
+   * The decoder, if any.
+   */
+  private PNGDecoder decoder;
+
+  /**
+   * The encoder, if any. (Either this or the above must exist).
+   */
+  private PNGEncoder encoder;
+
+  /**
+   * The source of this PNG (if encoding)
+   */
+  private BufferedImage sourceImage;
+
+  /**
+   * Creates a PNGFile object from an InputStream.
+   */
+  public PNGFile(InputStream in) throws IOException, PNGException
+  {
+    PNGChunk chunk;
+    byte[] fileHdr = new byte[8];
+    chunks = new Vector();
+    hasPalette = false;
+
+    if( in.read( fileHdr ) != 8 )
+      throw new IOException("Could not read file header.");
+    if( !validateHeader( fileHdr ) )
+      throw new PNGException("Invalid file header. Not a PNG file.");
+
+    chunk = PNGChunk.readChunk( in, false );
+    if( !(chunk instanceof PNGHeader) )
+      throw new PNGException("First chunk not a header chunk.");
+    header = (PNGHeader)chunk;
+    if( !header.isValidChunk() )
+      throw new PNGException("First chunk not a valid header.");
+    System.out.println(header);
+
+    decoder = new PNGDecoder( header );
+    // Read chunks.
+    do
+      {
+        chunk = PNGChunk.readChunk( in, false );
+        /*
+         * We could exit here or output some kind of warning.
+         * But in the meantime, we'll just silently drop invalid chunks.
+         */
+        if( chunk.isValidChunk() )
+          {
+            if( chunk instanceof PNGData )
+              decoder.addData( (PNGData)chunk );
+            else // Silently ignore multiple headers, and use only the first.
+              if( chunk.getType() != PNGChunk.TYPE_END )
+                {
+                  chunks.add( chunk );
+                  hasPalette |= ( chunk instanceof PNGPalette );
+                }
+          }
+        else
+          System.out.println("WARNING: Invalid chunk!");
+      }
+    while( chunk.getType() != PNGChunk.TYPE_END );
+
+    if( header.isIndexed() && !hasPalette )
+      throw new PNGException("File is indexed color and has no palette.");
+
+    width = header.getWidth();
+    height = header.getHeight();
+  }
+
+  /**
+   * Creates a PNG file from an existing BufferedImage.
+   */
+  public PNGFile(BufferedImage bi) throws PNGException
+  {
+    sourceImage = bi;
+    width = bi.getWidth();
+    height = bi.getHeight();
+    chunks = new Vector();
+    encoder = new PNGEncoder( bi );
+    header = encoder.getHeader();
+    if( header.isIndexed() )
+      chunks.add( encoder.getPalette() );
+
+    // Do the compression and put the data chunks in the list.
+    chunks.addAll( encoder.encodeImage() );
+  }
+
+  /**
+   * Writes a PNG file to an OutputStream
+   */
+  public void writePNG(OutputStream out) throws IOException
+  {
+    out.write( signature ); // write the signature.
+    header.writeChunk( out );
+    for( int i = 0; i < chunks.size(); i++ )
+      {
+        PNGChunk chunk = ((PNGChunk)chunks.elementAt(i));
+        chunk.writeChunk( out );
+      }
+    out.write( endChunk );
+  }
+
+  /**
+   * Check 8 bytes to see if it's a valid PNG header.
+   */
+  private boolean validateHeader( byte[] hdr )
+  {
+    if( hdr.length != 8 )
+      return false;
+    for( int i = 0; i < 8; i++ )
+      if( signature[i] != hdr[i] )
+        return false;
+    return true;
+  }
+
+  /**
+   * Return a loaded image as a bufferedimage.
+   */
+  public BufferedImage getBufferedImage()
+  {
+    if( decoder == null )
+      return sourceImage;
+
+    WritableRaster r = decoder.getRaster( header );
+    ColorModel cm;
+    if( header.isIndexed() )
+      {
+        PNGPalette pngp = getPalette();
+        cm = pngp.getPalette( getColorSpace() );
+      }
+    else
+      cm = decoder.getColorModel( getColorSpace(),
+                                  header.getColorType(),
+                                  header.getDepth() );
+
+    return new BufferedImage(cm, r, false, null);
+  }
+
+  /**
+   * Find the palette chunk and return it
+   */
+  private PNGPalette getPalette()
+  {
+    for(int i = 0; i < chunks.size(); i++ )
+      if( chunks.elementAt(i) instanceof PNGPalette )
+        return ((PNGPalette)chunks.elementAt(i));
+    return null;
+  }
+
+  /**
+   * Return the Color space to use, first preference is ICC profile, then
+   * a gamma chunk, or returns null for the default sRGB.
+   */
+  private ColorSpace getColorSpace()
+  {
+    PNGICCProfile icc = null;
+    PNGGamma gamma = null;
+    for(int i = 0; i < chunks.size(); i++ )
+      {
+        if( chunks.elementAt(i) instanceof PNGICCProfile )
+          icc = ((PNGICCProfile)chunks.elementAt(i));
+        else if(chunks.elementAt(i) instanceof PNGGamma )
+          gamma = ((PNGGamma)chunks.elementAt(i));
+      }
+
+    if( icc != null )
+      return icc.getColorSpace();
+//     if( gamma != null && !header.isGrayscale())
+//       return gamma.getColorSpace( header.isGrayscale() );
+    return null;
+  }
+}
diff --git a/libjava/classpath/gnu/javax/imageio/png/PNGFilter.java b/libjava/classpath/gnu/javax/imageio/png/PNGFilter.java
new file mode 100644
index 000000000..9be7b9127
--- /dev/null
+++ b/libjava/classpath/gnu/javax/imageio/png/PNGFilter.java
@@ -0,0 +1,237 @@
+/* PNGFilter.java -- PNG image filters.
+   Copyright (C) 2006 Free Software Foundation
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.javax.imageio.png;
+
+/**
+ * A utility class of static methods implementing the PNG filtering algorithms.
+ */
+public class PNGFilter
+{
+
+  public static final byte FILTER_NONE = 0;
+  public static final byte FILTER_SUB = 1;
+  public static final byte FILTER_UP = 2;
+  public static final byte FILTER_AVERAGE = 3;
+  public static final byte FILTER_PAETH = 4;
+
+  /**
+   * Return whether a filter should be used or FILTER_NONE,
+   * following the recommendations in the PNG spec.
+   */
+  public static boolean useFilter( PNGHeader header )
+  {
+    switch( header.getColorType() )
+      {
+      case PNGHeader.INDEXED:
+        return false;
+
+      case PNGHeader.GRAYSCALE:
+      case PNGHeader.RGB:
+        if( header.bytesPerPixel() <= 1 )
+          return false;
+      case PNGHeader.GRAYSCALE_WITH_ALPHA:
+      case PNGHeader.RGB_WITH_ALPHA:
+      default:
+        return true;
+      }
+  }
+
+  /**
+   * Heuristic for adaptively choosing a filter, following the scheme
+   * suggested in the PNG spec.
+   * @return a fiter type.
+   */
+  public static byte chooseFilter( byte[] scanline, byte[] lastScanline,
+                                  int bpp)
+
+  {
+    long[] values = new long[5];
+    int idx = 0;
+    for( int i = 0; i < 5; i++ )
+      {
+        byte[] filtered = filterScanline((byte)i, scanline, lastScanline, bpp);
+        values[i] = 0;
+        for(int j = 0; j < filtered.length; j++ )
+          values[i] += (int)(filtered[j] & 0xFF);
+        if( values[ idx ] > values[i] )
+          idx = i;
+      }
+    return (byte)idx;
+  }
+
+  /**
+   * Filter a scanline.
+   */
+  public static byte[] filterScanline( byte filtertype, byte[] scanline,
+                                       byte[] lastScanline, int bpp)
+  {
+    int stride = scanline.length;
+    byte[] out = new byte[ stride ];
+    switch( filtertype )
+      {
+      case FILTER_SUB:
+        for( int i = 0; i < bpp; i++)
+          out[ i ] = scanline[ i ];
+
+        for( int i = bpp; i < stride; i++ )
+          out[i] = (byte)(scanline[ i ] -
+                          scanline[ i - bpp ]);
+        break;
+
+      case FILTER_UP:
+        for( int i = 0; i < stride; i++ )
+          out[ i ] = (byte)(scanline[ i ] - lastScanline[ i ]);
+        break;
+
+      case FILTER_AVERAGE:
+        for( int i = 0; i < bpp; i++)
+          out[ i ] = (byte)((scanline[ i ] & 0xFF) - ((lastScanline[ i ] & 0xFF) >> 1));
+        for( int i = bpp; i < stride; i++ )
+          out[ i ] = (byte)((scanline[ i ] & 0xFF) -
+                            (((scanline[ i - bpp ] & 0xFF) +
+                              (lastScanline[ i ] & 0xFF)) >> 1));
+        break;
+
+      case FILTER_PAETH:
+        for( int i = 0; i < stride; i++ )
+          {
+            int x;
+            {
+              int a, b, c;
+              if( i >= bpp )
+                {
+                  a = (scanline[ i - bpp ] & 0xFF); // left
+                  c = (lastScanline[ i - bpp ] & 0xFF); // upper-left
+                }
+              else
+                a = c = 0;
+              b = (lastScanline[ i ] & 0xFF); // up
+
+              int p = (a + b - c);        // initial estimate
+              // distances to a, b, c
+              int pa = (p > a) ? p - a : a - p;
+              int pb = (p > b) ? p - b : b - p;
+              int pc = (p > c) ? p - c : c - p;
+              // return nearest of a,b,c,
+              // breaking ties in order a,b,c.
+              if( pa <= pb && pa <= pc ) x = a;
+              else { if( pb <= pc ) x = b;
+                else x = c;
+              }
+            }
+            out[ i ] = (byte)(scanline[ i ] - x);
+          }
+        break;
+      default:
+      case FILTER_NONE:
+        return scanline;
+      }
+    return out;
+  }
+
+  /**
+   * Unfilter a scanline.
+   */
+  public static byte[] unFilterScanline( int filtertype, byte[] scanline,
+                                         byte[] lastScanline, int bpp)
+  {
+    int stride = scanline.length;
+    byte[] out = new byte[ stride ];
+    switch( filtertype )
+      {
+
+      case FILTER_NONE:
+        System.arraycopy( scanline, 0, out, 0, stride );
+        break;
+
+      case FILTER_SUB:
+        for( int i = 0; i < bpp; i++)
+          out[ i ] = scanline[ i ];
+
+        for( int i = bpp; i < stride; i++ )
+          out[ i ] = (byte)(scanline[ i ] +
+                            out[ i - bpp ]);
+        break;
+
+      case FILTER_UP:
+        for( int i = 0; i < stride; i++ )
+          out[ i ] = (byte)(scanline[ i ] + lastScanline[ i ]);
+        break;
+
+      case FILTER_AVERAGE:
+        for( int i = 0; i < bpp; i++)
+          out[ i ] = (byte)((scanline[ i ] & 0xFF) + ((lastScanline[ i ] & 0xFF) >> 1));
+        for( int i = bpp; i < stride; i++ )
+          out[ i ] = (byte)((scanline[ i ] & 0xFF) +
+                            (((out[ i - bpp ] & 0xFF) + (lastScanline[ i ] & 0xFF)) >> 1));
+        break;
+
+      case FILTER_PAETH:
+        for( int i = 0; i < stride; i++ )
+          {
+            int x;
+            {
+              int a, b, c;
+              if( i >= bpp )
+                {
+                  a = (out[ i - bpp ] & 0xFF); // left
+                  c = (lastScanline[ i - bpp ] & 0xFF); // upper-left
+                }
+              else
+                a = c = 0;
+              b = (lastScanline[ i ] & 0xFF); // up
+
+              int p = (a + b - c);        // initial estimate
+              // distances to a, b, c
+              int pa = (p > a) ? p - a : a - p;
+              int pb = (p > b) ? p - b : b - p;
+              int pc = (p > c) ? p - c : c - p;
+              // return nearest of a,b,c,
+              // breaking ties in order a,b,c.
+              if( pa <= pb && pa <= pc ) x = a;
+              else { if( pb <= pc ) x = b;
+                else x = c;
+              }
+            }
+            out[ i ] = (byte)(scanline[ i ] + x);
+          }
+        break;
+      }
+    return out;
+  }
+}
diff --git a/libjava/classpath/gnu/javax/imageio/png/PNGGamma.java b/libjava/classpath/gnu/javax/imageio/png/PNGGamma.java
new file mode 100644
index 000000000..b9c3f21c3
--- /dev/null
+++ b/libjava/classpath/gnu/javax/imageio/png/PNGGamma.java
@@ -0,0 +1,85 @@
+/* PNGGamma.java -- GAMA chunk.
+   Copyright (C) 2006 Free Software Foundation
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.javax.imageio.png;
+
+import java.awt.color.ColorSpace;
+
+/**
+ * A PNG gAMA (gamma) chunk.
+ */
+public class PNGGamma extends PNGChunk
+{
+  private double gamma;
+
+  protected PNGGamma( int type, byte[] data, int crc ) throws PNGException
+  {
+    super( type, data, crc );
+    if( data.length < 4 )
+      throw new PNGException("Unexpectedly short time chunk. ("+data.length+" bytes)");
+    long g = ((data[0] & 0xFF) << 24) | ( (data[1] & 0xFF) << 16 ) |
+      ((data[2] & 0xFF) << 8) | (data[3] & 0xFF);
+    gamma = (double)g;
+    gamma = 100000.0/gamma;
+  }
+
+  public PNGGamma( double g )
+  {
+    super( TYPE_GAMMA );
+    data = new byte[ 4 ];
+    gamma = g;
+    long tmp = (long)(100000.0/gamma);
+    data[0] = (byte)((tmp & 0xFF000000) >> 24);
+    data[1] = (byte)((tmp & 0xFF0000) >> 16);
+    data[2] = (byte)((tmp & 0xFF00) >> 8);
+    data[3] = (byte)(tmp & 0xFF);
+  }
+
+  /**
+   * Returns a ColorSpace object corresponding to this gamma value.
+   */
+  public ColorSpace getColorSpace(boolean grayscale)
+  {
+    // FIXME.
+    return null;
+  }
+
+  public String toString()
+  {
+    return "PNG Gamma chunk, value: "+gamma;
+  }
+}
diff --git a/libjava/classpath/gnu/javax/imageio/png/PNGHeader.java b/libjava/classpath/gnu/javax/imageio/png/PNGHeader.java
new file mode 100644
index 000000000..115e50311
--- /dev/null
+++ b/libjava/classpath/gnu/javax/imageio/png/PNGHeader.java
@@ -0,0 +1,257 @@
+/* PNGHeader.java -- PNG Header
+   Copyright (C) 2006 Free Software Foundation
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.javax.imageio.png;
+
+/**
+ * A PNG Header chunk.
+ */
+public class PNGHeader extends PNGChunk
+{
+  private int width, height, depth;
+  private int colorType, compression, filter, interlace;
+
+  /**
+   * The valid interlace types.
+   */
+  public static final int INTERLACE_NONE = 0;
+  public static final int INTERLACE_ADAM7 = 1;
+
+  /**
+   * The valid color types.
+   */
+  public static final int GRAYSCALE = 0;
+  public static final int RGB = 2;
+  public static final int INDEXED = 3;
+  public static final int GRAYSCALE_WITH_ALPHA = 4;
+  public static final int RGB_WITH_ALPHA = 6;
+
+  /**
+   * Parses a PNG Header chunk.
+   */
+  protected PNGHeader( int type, byte[] data, int crc ) throws PNGException
+  {
+    super( type, data, crc );
+    if( data.length < 13 )
+      throw new PNGException("Unexpectedly short header chunk. (" + data.length
+                             + " bytes)");
+
+    width = ((data[0] & 0xFF) << 24) | ( (data[1] & 0xFF) << 16 ) |
+      ((data[2] & 0xFF) << 8) | (data[3] & 0xFF);
+    height = ((data[4] & 0xFF) << 24) | ( (data[5] & 0xFF) << 16 ) |
+      ((data[6] & 0xFF) << 8) | (data[7] & 0xFF);
+    depth = (data[8] & 0xFF);
+    colorType = (data[9] & 0xFF);
+    compression = (data[10] & 0xFF);
+    filter = (data[11] & 0xFF);
+    interlace = (data[12] & 0xFF);
+  }
+
+  /**
+   * Create a PNG header chunk.
+   * Warning: This trusts that the parameters are valid.
+   */
+  public PNGHeader(int width, int height, int depth,
+                   int colorType, boolean interlace)
+  {
+    super( TYPE_HEADER );
+    data = new byte[ 13 ];
+
+    this.width = width;
+    this.height = height;
+    this.depth = depth;
+    compression = filter = 0;
+    this.colorType = colorType;
+    this.interlace = interlace ? 1 : 0;
+
+    // Build the data chunk.
+    byte[] a = getInt( width );
+    byte[] b = getInt( height );
+    data[0] = a[0]; data[1] = a[1]; data[2] = a[2]; data[3] = a[3];
+    data[4] = b[0]; data[5] = b[1]; data[6] = b[2]; data[7] = b[3];
+    data[8] = (byte)depth;
+    data[9] = (byte)colorType;
+    data[10] = (byte)compression;
+    data[11] = (byte)filter;
+    data[12] = (byte)this.interlace;
+  }
+
+  /**
+   * Validates the header fields
+   */
+  public boolean isValidChunk()
+  {
+    if( !super.isValidChunk() )
+      return false;
+
+    // width and height must be nonzero
+    if( width == 0 || height == 0 )
+      return false;
+    // colorType can be 0,2,3,4,6
+    if( (colorType & 0xFFFFFFF8) != 0 || colorType == 5 || colorType == 1)
+      return false;
+    // Possible valid depths are 1,2,4,8,16
+    if( !((depth == 1) || (depth == 2) || (depth == 4) ||
+        (depth == 8) || (depth == 16)) )
+      return false;
+    if( colorType == INDEXED && depth == 16 )
+      return false;
+    if( ( colorType == RGB || colorType == GRAYSCALE_WITH_ALPHA ||
+          colorType == RGB_WITH_ALPHA ) &&
+        depth < 8 )
+      return false;
+    // Only compression and filter methods zero are defined
+    if( compression != 0 || filter != 0 )
+      return false;
+    // Interlace methods, 0 and 1 are valid values.
+    if( (interlace & 0xFFFFFFFE) != 0 )
+      return false;
+
+    return true;
+  }
+
+  /**
+   * Returns <code>true</code> if this PNG is indexed-color
+   */
+  public boolean isIndexed()
+  {
+    return (colorType == INDEXED);
+  }
+
+  /**
+   * Returns <code>true</code> if this PNG is grayscale
+   */
+  public boolean isGrayscale()
+  {
+    return ((colorType ==  GRAYSCALE) || (colorType == GRAYSCALE_WITH_ALPHA));
+  }
+
+  /**
+   * Returns the color type of the image.
+   */
+  public int getColorType()
+  {
+    return colorType;
+  }
+
+  /**
+   * Returns whether the image is interlaced or not.
+   */
+  public boolean isInterlaced()
+  {
+    return (interlace != 0);
+  }
+
+  /**
+   * Returns the number of bytes per pixel.
+   */
+  public int bytesPerPixel()
+  {
+    switch( colorType )
+      {
+      case GRAYSCALE_WITH_ALPHA:
+        return ((depth * 2) >> 3);
+      case RGB:
+        return ((depth * 3) >> 3);
+      case RGB_WITH_ALPHA:
+        return ((depth * 4) >> 3);
+
+      default:
+      case GRAYSCALE:
+      case INDEXED:
+        int i = (depth >> 3);
+        if( i > 0 ) return i;
+        return 1; // if bytes per pixel < 1, return 1 anyway.
+      }
+  }
+
+  /**
+   * Returns the stride of one scanline, in bytes.
+   */
+  public int getScanlineStride()
+  {
+    long nBits = 0; // bits per scanline - scanlines are on byte offsets.
+    switch( colorType )
+      {
+      case GRAYSCALE:
+        nBits = width * depth;
+        break;
+      case RGB:
+        nBits = width * depth * 3;
+        break;
+      case INDEXED:
+        nBits = depth * width;
+        break;
+      case GRAYSCALE_WITH_ALPHA:
+        nBits = depth * width * 2;
+        break;
+      case RGB_WITH_ALPHA:
+        nBits = depth * width * 4;
+        break;
+      }
+    // Round up number of bits to the nearest byte
+    if( (nBits & 0x07) != 0 )
+      nBits += (8 - (nBits & 0x07));
+
+    return (int)(nBits >> 3); // return # of bytes.
+  }
+
+  public int getWidth()
+  {
+    return width;
+  }
+
+  public int getHeight()
+  {
+    return height;
+  }
+
+  public int getDepth()
+  {
+    return depth;
+  }
+
+  /**
+   * Debugging string.
+   */
+  public String toString()
+  {
+    return "Header Chunk. Image width:"+width+" height:"+height+
+      " depth:"+depth+" color type:"+colorType+" compression type:"+
+      compression+" filter type:"+ filter+" interlace:"+interlace;
+  }
+}
diff --git a/libjava/classpath/gnu/javax/imageio/png/PNGICCProfile.java b/libjava/classpath/gnu/javax/imageio/png/PNGICCProfile.java
new file mode 100644
index 000000000..9ecea7166
--- /dev/null
+++ b/libjava/classpath/gnu/javax/imageio/png/PNGICCProfile.java
@@ -0,0 +1,116 @@
+/* PNGICCProfile.java --
+   Copyright (C) 2006 Free Software Foundation
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.javax.imageio.png;
+
+import java.awt.color.ICC_Profile;
+import java.awt.color.ICC_ColorSpace;
+import java.awt.color.ColorSpace;
+import java.io.UnsupportedEncodingException;
+import java.io.IOException;
+import java.io.ByteArrayInputStream;
+import java.util.zip.InflaterInputStream;
+import java.util.zip.Deflater;
+
+/**
+ * A PNG iCCP (ICC Profile) chunk.
+ */
+public class PNGICCProfile extends PNGChunk
+{
+  private String name;
+  private ICC_Profile profile;
+  // A generic profile name to use "ICC Profile"
+  private static final byte[] genericName = new byte[]
+  { 0x49, 0x43, 0x43, 0x20, 0x50, 0x72, 0x6f, 0x66, 0x69, 0x6c, 0x65 };
+
+  protected PNGICCProfile( int type, byte[] data, int crc ) throws PNGException
+  {
+    super( type, data, crc );
+    int i = 0;
+    while( data[i++] != 0 )
+      ;
+
+    try
+      {
+        name = new String(data, 0, i, "8859_1");
+      }
+    catch(UnsupportedEncodingException e)
+      {
+        name = ""; // shouldn't really happen.
+      }
+    if( data[i++] != 0 )
+      throw new PNGException("Can't handle nonzero compression types with iCCP chunks.");
+    try
+      {
+        ByteArrayInputStream bos = new ByteArrayInputStream( data, i,
+                                                             data.length - i );
+        profile = ICC_Profile.getInstance( new InflaterInputStream( bos ) );
+      }
+    catch(IOException ioe)
+      {
+        throw new PNGException("Couldn't read iCCP profile chunk.");
+      }
+    System.out.println("Got profile:"+profile);
+  }
+
+  public PNGICCProfile( ICC_Profile profile )
+  {
+    super( TYPE_PROFILE );
+    this.profile = profile;
+    byte[] profData = profile.getData();
+    byte[] outData = new byte[ profData.length * 2 ];
+    Deflater deflater = new Deflater();
+    deflater.setInput( profData );
+    deflater.finish();
+    int n = deflater.deflate( outData );
+    data = new byte[ n + 11 + 2 ];
+    System.arraycopy(genericName, 0, data, 0, 11 );
+    data[11] = data[12] = 0; // null separator and compression type.
+    // Copy compressed data
+    System.arraycopy(outData, 0, data, 13, n );
+  }
+
+  public ColorSpace getColorSpace()
+  {
+    return new ICC_ColorSpace( profile );
+  }
+
+  public String toString()
+  {
+    return "PNG ICC Profile, name: "+name;
+  }
+}
diff --git a/libjava/classpath/gnu/javax/imageio/png/PNGImageReader.java b/libjava/classpath/gnu/javax/imageio/png/PNGImageReader.java
new file mode 100644
index 000000000..3209baa26
--- /dev/null
+++ b/libjava/classpath/gnu/javax/imageio/png/PNGImageReader.java
@@ -0,0 +1,224 @@
+/* PNGImageReader.java -- The ImageIO ImageReader for PNG
+   Copyright (C) 2006 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.javax.imageio.png;
+
+import gnu.javax.imageio.IIOInputStream;
+
+import java.awt.image.BufferedImage;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.Iterator;
+
+import javax.imageio.ImageReadParam;
+import javax.imageio.ImageReader;
+import javax.imageio.ImageTypeSpecifier;
+import javax.imageio.metadata.IIOMetadata;
+import javax.imageio.stream.ImageInputStream;
+
+/**
+ * The ImageIO ImageReader for PNG images.
+ *
+ * @author Roman Kennke (kennke@aicas.com)
+ */
+public class PNGImageReader
+  extends ImageReader
+{
+
+  /**
+   * The PNG file.
+   */
+  private PNGFile pngFile;
+
+  /**
+   * The decoded image.
+   */
+  private BufferedImage image;
+
+  /**
+   * The supported image types for PNG.
+   */
+  private ArrayList imageTypes;
+
+  /**
+   * Creates a new instance.
+   *
+   * @param spi the corresponding ImageReaderSpi
+   */
+  public PNGImageReader(PNGImageReaderSpi spi)
+  {
+    super(spi);
+  }
+
+  /**
+   * Returns the height of the image.
+   */
+  public int getHeight(int imageIndex)
+    throws IOException
+  {
+    checkIndex(imageIndex);
+    readImage();
+    return image.getHeight();
+  }
+
+  /**
+   * Returns the width of the image.
+   *
+   * @param imageIndex the index of the image
+   *
+   * @return the width of the image
+   */
+  public int getWidth(int imageIndex) throws IOException
+  {
+    checkIndex(imageIndex);
+    readImage();
+    return image.getWidth();
+  }
+
+  /**
+   * Returns the image types for the image.
+   *
+   * @see ImageReader#getImageTypes(int)
+   */
+  public Iterator getImageTypes(int imageIndex)
+    throws IOException
+  {
+    checkIndex(imageIndex);
+    readImage();
+    if (imageTypes == null)
+      {
+        imageTypes = new ArrayList();
+        imageTypes.add(new ImageTypeSpecifier(image.getColorModel(),
+                                              image.getSampleModel()));
+      }
+    return imageTypes.iterator();
+  }
+
+  /**
+   * Returns the number of images in the stream.
+   *
+   * @return the number of images in the stream
+   *
+   * @see ImageReader#getNumImages(boolean)
+   */
+  public int getNumImages(boolean allowSearch)
+    throws IOException
+  {
+    return 1;
+  }
+
+  /**
+   * Reads the image.
+   *
+   * @param imageIndex the index of the image to read
+   * @param param additional parameters
+   */
+  public BufferedImage read(int imageIndex, ImageReadParam param)
+    throws IOException
+  {
+    checkIndex(imageIndex);
+    readImage();
+    return image;
+  }
+
+  /**
+   * Sets the input and checks the input parameter.
+   *
+   * @see ImageReader#setInput(Object, boolean, boolean)
+   */
+  public void setInput(Object input,
+                       boolean seekForwardOnly,
+                       boolean ignoreMetadata)
+  {
+    super.setInput(input, seekForwardOnly, ignoreMetadata);
+    if (! (input instanceof InputStream || input instanceof ImageInputStream))
+      throw new IllegalArgumentException("Input not an ImageInputStream");
+  }
+
+  public IIOMetadata getImageMetadata(int imageIndex)
+    throws IOException
+  {
+    // TODO: Not (yet) supported.
+    checkIndex(imageIndex);
+    return null;
+  }
+
+  public IIOMetadata getStreamMetadata()
+    throws IOException
+  {
+    // TODO: Not (yet) supported.
+    return null;
+  }
+
+  /**
+   * Checks the image indexa and throws and IndexOutOfBoundsException if
+   * appropriate.
+   *
+   * @param index the index to check
+   */
+  private void checkIndex(int index)
+  {
+    if (index > 0)
+      throw new IndexOutOfBoundsException("Image index out of bounds");
+  }
+
+  /**
+   * Makes sure that the image is read.
+   *
+   * @throws IOException if something goes wrong
+   */
+  private void readImage()
+    throws IOException
+  {
+    if (pngFile == null)
+      {
+        if (input instanceof InputStream)
+          pngFile = new PNGFile((InputStream) input);
+        else if (input instanceof ImageInputStream)
+          pngFile = new PNGFile(new IIOInputStream((ImageInputStream) input));
+        else
+          assert false : "Must not happen";
+      }
+
+    if (pngFile != null && image == null)
+      {
+        image = pngFile.getBufferedImage();
+      }
+  }
+}
diff --git a/libjava/classpath/gnu/javax/imageio/png/PNGImageReaderSpi.java b/libjava/classpath/gnu/javax/imageio/png/PNGImageReaderSpi.java
new file mode 100644
index 000000000..0092ab558
--- /dev/null
+++ b/libjava/classpath/gnu/javax/imageio/png/PNGImageReaderSpi.java
@@ -0,0 +1,128 @@
+/* PNGImageReaderSpi.java -- The ImageReader service provider for PNG
+   Copyright (C) 2006 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.javax.imageio.png;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Locale;
+
+import javax.imageio.ImageReader;
+import javax.imageio.spi.ImageReaderSpi;
+import javax.imageio.stream.ImageInputStream;
+
+/**
+ * The ImageIO ImageReader service provider for PNG images.
+ *
+ * @author Roman Kennke (kennke@aicas.com)
+ */
+public class PNGImageReaderSpi
+  extends ImageReaderSpi
+{
+
+  /**
+   * The PNG file signature.
+   */
+  private static final byte[] SIGNATURE = new byte[]
+                              { (byte) 137, 80, 78, 71, 13, 10, 26, 10 };
+
+  private static final String VENDOR_NAME = "GNU";
+  static final String VERSION = "1.0";
+  static final String READER_CLASSNAME =
+                                       "gnu.javax.imageio.png.PNGImageReader";
+  static final String[] NAMES = { "Portable Network Graphics" };
+  static final String[] SUFFIXES = { ".png" , ".PNG" };
+  static final String[] MIME_TYPES = { "image/png" };
+  static final String[] WRITER_SPI_NAMES =
+    new String[] { "gnu.javax.imageio.png.PNGWriterSpi" };
+  static final Class[] INPUT_TYPES = new Class[]{ InputStream.class,
+                                                  ImageInputStream.class};
+  public PNGImageReaderSpi()
+  {
+    super(VENDOR_NAME, VERSION, NAMES, SUFFIXES, MIME_TYPES, READER_CLASSNAME,
+          INPUT_TYPES, WRITER_SPI_NAMES, false, null, null, null, null, false,
+          null, null, null, null);
+  }
+
+  /**
+   * Determines if the PNG ImageReader can decode the specified input.
+   *
+   * @param source the source to decode
+   */
+  public boolean canDecodeInput(Object source) throws IOException
+  {
+    boolean canDecode = false;
+    if (source instanceof ImageInputStream)
+      {
+        ImageInputStream in = (ImageInputStream) source;
+        in.mark();
+        canDecode = true;
+        for (int i = 0; i < SIGNATURE.length && canDecode; i++)
+          {
+            byte sig = (byte) in.read();
+            if (sig != SIGNATURE[i]) {
+              canDecode = false;
+            }
+          }
+        in.reset();
+      }
+    return canDecode;
+  }
+
+  /**
+   * Returns a new PNGImageReader instance.
+   *
+   * @param extension the extension, ignored
+   */
+  public ImageReader createReaderInstance(Object extension)
+    throws IOException
+  {
+    return new PNGImageReader(this);
+  }
+
+  /**
+   * Returns a description.
+   *
+   * @param locale the locale
+   */
+  public String getDescription(Locale locale)
+  {
+    return "Portable Network Graphics";
+  }
+
+}
diff --git a/libjava/classpath/gnu/javax/imageio/png/PNGPalette.java b/libjava/classpath/gnu/javax/imageio/png/PNGPalette.java
new file mode 100644
index 000000000..197cad846
--- /dev/null
+++ b/libjava/classpath/gnu/javax/imageio/png/PNGPalette.java
@@ -0,0 +1,127 @@
+/* PNGPalette.java --
+   Copyright (C) 2006 Free Software Foundation
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.javax.imageio.png;
+
+import java.awt.color.ColorSpace;
+import java.awt.image.IndexColorModel;
+
+/**
+ * A PNG Palette chunk.
+ */
+public class PNGPalette extends PNGChunk
+{
+  private int[] red,green,blue;
+
+  protected PNGPalette( int type, byte[] data, int crc ) throws PNGException
+  {
+    super( type, data, crc );
+    double l = data.length;
+    l /= 3.0;
+    // Check if it's divisible by 3. (Yuck.)
+    if( l - Math.floor(l) != 0.0 )
+      throw new PNGException("Invalid size of palette chunk.");
+    int nEntries = (int)l;
+
+    red = new int[ nEntries ];
+    green = new int[ nEntries ];
+    blue = new int[ nEntries ];
+    for( int i = 0; i < nEntries; i++ )
+      {
+        red[i] = (data[ i * 3 ] & 0xFF);
+        green[i] = (data[ i * 3 + 1 ] & 0xFF);
+        blue[i] = (data[ i * 3 + 2] & 0xFF);
+      }
+  }
+
+  public PNGPalette( IndexColorModel cm )
+  {
+    super( TYPE_PALETTE );
+    int n = cm.getMapSize();
+    data = new byte[ n * 3 ];
+    red = new int[ n ];
+    green = new int[ n ];
+    blue = new int[ n ];
+    for(int i = 0; i < n; i++ )
+      {
+        red[i] = data[i * 3] = (byte)cm.getRed(i);
+        green[i] = data[i * 3 + 1] = (byte)cm.getGreen(i);
+        blue[i] = data[i * 3 + 2] = (byte)cm.getBlue(i);
+      }
+  }
+
+  public IndexColorModel getPalette( ColorSpace cs )
+  {
+    int nc = red.length;
+    byte[] r = new byte[nc];
+    byte[] g = new byte[nc];
+    byte[] b = new byte[nc];
+
+    if( cs == null )
+      {
+        for(int i = 0; i < nc; i ++ )
+          {
+            r[i] = (byte)red[i];
+            g[i] = (byte)green[i];
+            b[i] = (byte)blue[i];
+          }
+      }
+    else
+      {
+        for(int i = 0; i < nc; i ++ )
+          {
+            float[] in = new float[3];
+            in[0] = (((float)red[i]) / 255f);
+            in[1] = (((float)green[i]) / 255f);
+            in[2] = (((float)blue[i]) / 255f);
+            float[] out = cs.toRGB( in );
+            r[i] = (byte)( Math.round(out[0] * 255.0) );
+            g[i] = (byte)( Math.round(out[1] * 255.0) );
+            b[i] = (byte)( Math.round(out[2] * 255.0) );
+          }
+      }
+    return new IndexColorModel(8, nc, r, g, b);
+  }
+
+  public String toString()
+  {
+    String s = "PNG Palette:\n";
+    for( int i = 0; i < red.length; i++)
+      s = s + "Index " + i + ": ["+ red[i] +", "+green[i]+", "+blue[i]+"]\n";
+    return s;
+  }
+}
diff --git a/libjava/classpath/gnu/javax/imageio/png/PNGPhys.java b/libjava/classpath/gnu/javax/imageio/png/PNGPhys.java
new file mode 100644
index 000000000..d15f09e88
--- /dev/null
+++ b/libjava/classpath/gnu/javax/imageio/png/PNGPhys.java
@@ -0,0 +1,112 @@
+/* PNGPhys.java --
+   Copyright (C) 2006 Free Software Foundation
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.javax.imageio.png;
+
+/**
+ * A PNG "pHYS" chunk - pixel physical dimensions
+ */
+public class PNGPhys extends PNGChunk
+{
+  long x, y;
+  double ratio;
+  boolean usesRatio;
+
+  protected PNGPhys( int type, byte[] data, int crc ) throws PNGException
+  {
+    super( type, data, crc );
+    if( data.length < 9 )
+      throw new PNGException("Unexpected size of pHYS chunk.");
+    x = ((data[0] & 0xFF) << 24) | ( (data[1] & 0xFF) << 16 ) |
+      ((data[2] & 0xFF) << 8) | (data[3] & 0xFF);
+    y = ((data[4] & 0xFF) << 24) | ( (data[5] & 0xFF) << 16 ) |
+      ((data[6] & 0xFF) << 8) | (data[7] & 0xFF);
+    if(data[8] == 0)
+      {
+        ratio = ((double)x)/((double)y);
+        usesRatio = true;
+      }
+  }
+
+  public PNGPhys( double ratio )
+  {
+    super( TYPE_PHYS );
+
+    this.ratio = ratio;
+    usesRatio = true;
+
+    if( ratio < 1.0 )
+      {
+        y = 0xFFFFFFFF;
+        x = (long)(0xFFFFFFFFL * ratio);
+      }
+    else
+      {
+        x = 0xFFFFFFFF;
+        y = (long)(0xFFFFFFFFL * ratio);
+      }
+    makeData();
+  }
+
+  public PNGPhys( int x, int y )
+  {
+    super( TYPE_PHYS );
+    usesRatio = false;
+    this.x = x;
+    this.y = y;
+    makeData();
+  }
+
+  private void makeData()
+  {
+    data = new byte[ 9 ];
+    byte[] a = getInt( (int)x );
+    byte[] b = getInt( (int)y );
+    data[0] = a[0]; data[1] = a[1]; data[2] = a[2]; data[3] = a[3];
+    data[4] = b[0]; data[5] = b[1]; data[6] = b[2]; data[7] = b[3];
+    data[7] = (usesRatio) ? 0 : (byte)0xFF;
+  }
+
+  public String toString()
+  {
+    String s = "PNG Physical pixel size chunk.";
+    if( usesRatio )
+      return s + " Aspect ratio (x/y): " + ratio;
+    else
+      return s + " " + x + " by " + y + " pixels per meter. (x, y).";
+  }
+}
diff --git a/libjava/classpath/gnu/javax/imageio/png/PNGTime.java b/libjava/classpath/gnu/javax/imageio/png/PNGTime.java
new file mode 100644
index 000000000..824f06f83
--- /dev/null
+++ b/libjava/classpath/gnu/javax/imageio/png/PNGTime.java
@@ -0,0 +1,83 @@
+/* PNGTime.java --
+   Copyright (C) 2006 Free Software Foundation
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.javax.imageio.png;
+
+import java.util.Date;
+
+/**
+ * A PNG tIME chunk.
+ */
+public class PNGTime extends PNGChunk
+{
+  private Date date;
+
+  protected PNGTime( int type, byte[] data, int crc ) throws PNGException
+  {
+    super( type, data, crc );
+    if( data.length < 7 )
+      throw new PNGException("Unexpectedly short time chunk. ("+data.length+" bytes)");
+
+    // PNG value is absolute (2006, not 106 or 06), java is from 1900.
+    int year = ( (data[0] & 0xFF) << 8 ) | (data[1] & 0xFF);
+    int month = (data[2] & 0xFF); // java counts from 0. PNG from 1.
+    int day = (data[3] & 0xFF);
+    int hour = (data[4] & 0xFF);
+    int minute = (data[5] & 0xFF);
+    int second = (data[6] & 0xFF);
+    date = new Date( year - 1900, month - 1, day, hour, minute, second );
+  }
+
+  public PNGTime( Date d )
+  {
+    super( TYPE_TIME );
+    data = new byte[ 7 ];
+    int tmp = d.getYear() + 1900;
+    data[0] = (byte)((tmp & 0xFF00) >> 8);
+    data[1] = (byte)(tmp & 0x00FF);
+    data[2] = (byte)(d.getMonth() + 1);
+    data[3] = (byte)(d.getDay());
+    data[4] = (byte)(d.getHours());
+    data[5] = (byte)(d.getMinutes());
+    data[6] = (byte)(d.getSeconds());
+  }
+
+  public String toString()
+  {
+    return "PNG Time chunk: "+date;
+  }
+}