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diff --git a/libjava/classpath/gnu/javax/imageio/png/PNGImageReaderSpi.java b/libjava/classpath/gnu/javax/imageio/png/PNGImageReaderSpi.java
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+/* 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";
+  }
+
+}