| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| |
| package org.apache.harmony.x.imageio.plugins.png; |
| |
| import org.apache.harmony.x.imageio.plugins.jpeg.JPEGSpiConsts; |
| |
| import javax.imageio.spi.ImageReaderSpi; |
| import javax.imageio.spi.ServiceRegistry; |
| import javax.imageio.ImageReader; |
| import javax.imageio.stream.ImageInputStream; |
| import java.io.IOException; |
| import java.util.Locale; |
| |
| public class PNGImageReaderSpi extends ImageReaderSpi { |
| static final String PNG_NAMES[] = new String[] {"png", "PNG"}; |
| static final String PNG_SUFFIXES[] = new String[] {"png"}; |
| static final String PNG_MIME_TYPES[] = new String[] {"image/png"}; |
| static final String PNG_READER_CLASS_NAME = "org.apache.harmony.x.imageio.plugins.png.PNGImageReader"; |
| static final String PNG_READER_SPI_NAMES[] = {"org.apache.harmony.x.imageio.plugins.png.PNGImageReaderSpi"}; |
| |
| public PNGImageReaderSpi() { |
| super( |
| JPEGSpiConsts.vendorName, JPEGSpiConsts.version, |
| PNG_NAMES, PNG_SUFFIXES, |
| PNG_MIME_TYPES, PNG_READER_CLASS_NAME, |
| STANDARD_INPUT_TYPE, null, |
| false, null, |
| null, null, |
| null, false, |
| null, null, |
| null, null |
| ); |
| } |
| |
| @Override |
| public boolean canDecodeInput(Object source) throws IOException { |
| ImageInputStream markable = (ImageInputStream) source; |
| markable.mark(); |
| |
| byte[] signature = new byte[8]; |
| markable.seek(0); |
| |
| int nBytes = markable.read(signature, 0, 8); |
| if(nBytes != 8) markable.read(signature, nBytes, 8-nBytes); |
| markable.reset(); |
| |
| // PNG signature: 137 80 78 71 13 10 26 10 |
| return (signature[0] & 0xFF) == 137 && |
| (signature[1] & 0xFF) == 80 && |
| (signature[2] & 0xFF) == 78 && |
| (signature[3] & 0xFF) == 71 && |
| (signature[4] & 0xFF) == 13 && |
| (signature[5] & 0xFF) == 10 && |
| (signature[6] & 0xFF) == 26 && |
| (signature[7] & 0xFF) == 10; |
| } |
| |
| @Override |
| public ImageReader createReaderInstance(Object extension) throws IOException { |
| return new PNGImageReader(this); |
| } |
| |
| @Override |
| public String getDescription(Locale locale) { |
| return "DRL PNG decoder"; |
| } |
| |
| @Override |
| public void onRegistration(ServiceRegistry registry, Class<?> category) { |
| super.onRegistration(registry, category); |
| } |
| } |