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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";
+ }
+
+}