1 /* 2 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package com.sun.imageio.plugins.png; 27 28 import java.io.IOException; 29 import java.util.Locale; 30 import java.util.Iterator; 31 import javax.imageio.ImageReader; 32 import javax.imageio.spi.ImageReaderSpi; 33 import javax.imageio.metadata.IIOMetadataFormat; 34 import javax.imageio.metadata.IIOMetadataFormatImpl; 35 import javax.imageio.stream.ImageInputStream; 36 37 public class PNGImageReaderSpi extends ImageReaderSpi { 38 39 private static final String vendorName = "Oracle Corporation"; 40 41 private static final String version = "1.0"; 42 43 private static final String[] names = { "png", "PNG" }; 44 45 private static final String[] suffixes = { "png" }; 46 47 private static final String[] MIMETypes = { "image/png", "image/x-png" }; 48 49 private static final String readerClassName = 50 "com.sun.imageio.plugins.png.PNGImageReader"; 51 52 private static final String[] writerSpiNames = { 53 "com.sun.imageio.plugins.png.PNGImageWriterSpi" 54 }; 55 56 public PNGImageReaderSpi() { 57 super(vendorName, 58 version, 59 names, 60 suffixes, 61 MIMETypes, 62 readerClassName, 63 new Class[] { ImageInputStream.class }, 64 writerSpiNames, 65 false, 66 null, null, 67 null, null, 68 true, 69 PNGMetadata.nativeMetadataFormatName, 70 "com.sun.imageio.plugins.png.PNGMetadataFormat", 71 null, null 72 ); 73 } 74 75 public String getDescription(Locale locale) { 76 return "Standard PNG image reader"; 77 } 78 79 public boolean canDecodeInput(Object input) throws IOException { 80 if (!(input instanceof ImageInputStream)) { 81 return false; 82 } 83 84 ImageInputStream stream = (ImageInputStream)input; 85 byte[] b = new byte[8]; 86 stream.mark(); 87 stream.readFully(b); 88 stream.reset(); 89 90 return (b[0] == (byte)137 && 91 b[1] == (byte)80 && 92 b[2] == (byte)78 && 93 b[3] == (byte)71 && 94 b[4] == (byte)13 && 95 b[5] == (byte)10 && 96 b[6] == (byte)26 && 97 b[7] == (byte)10); 98 } 99 100 public ImageReader createReaderInstance(Object extension) { 101 return new PNGImageReader(this); 102 } 103 }