/* * Copyright (c) 2007, 2017, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code 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 * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package org.jemmy.image.awt; import java.awt.Color; import java.awt.image.BufferedImage; import java.io.InputStream; import java.io.IOException; import java.io.FileInputStream; import org.jemmy.JemmyException; import java.util.zip.DataFormatException; import java.util.zip.Inflater; /** * Allows to load PNG graphical file. * @author Alexandre Iline */ public class PNGDecoder extends Object { InputStream in; /** * Constructs a PNGDecoder object. * @param in input stream to read PNG image from. */ public PNGDecoder(InputStream in) { this.in = in; } byte read() throws IOException { byte b = (byte)in.read(); return(b); } int readInt() throws IOException { byte b[] = read(4); return(((b[0]&0xff)<<24) + ((b[1]&0xff)<<16) + ((b[2]&0xff)<<8) + ((b[3]&0xff))); } byte[] read(int count) throws IOException { byte[] result = new byte[count]; for(int i = 0; i < count; i++) { result[i] = read(); } return(result); } boolean compare(byte[] b1, byte[] b2) { if(b1.length != b2.length) { return(false); } for(int i = 0; i < b1.length; i++) { if(b1[i] != b2[i]) { return(false); } } return(true); } void checkEquality(byte[] b1, byte[] b2) { if(!compare(b1, b2)) { throw(new JemmyException("Format error")); } } /** * Decodes image from an input stream passed into constructor. * @return a BufferedImage object * @throws IOException todo document */ public BufferedImage decode() throws IOException { return decode(true); } /** * Decodes image from an input stream passed into constructor. * @return a BufferedImage object * @param closeStream requests method to close the stream after the image is read * @throws IOException todo document */ public BufferedImage decode(boolean closeStream) throws IOException { byte[] id = read(12); checkEquality(id, new byte[] {-119, 80, 78, 71, 13, 10, 26, 10, 0, 0, 0, 13}); byte[] ihdr = read(4); checkEquality(ihdr, "IHDR".getBytes()); int width = readInt(); int height = readInt(); BufferedImage result = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); byte[] head = read(5); int mode; if(compare(head, new byte[]{1, 0, 0, 0, 0})) { mode = PNGEncoder.BW_MODE; } else if(compare(head, new byte[]{8, 0, 0, 0, 0})) { mode = PNGEncoder.GREYSCALE_MODE; } else if(compare(head, new byte[]{8, 2, 0, 0, 0})) { mode = PNGEncoder.COLOR_MODE; } else { throw(new JemmyException("Format error")); } readInt();//!!crc int size = readInt(); byte[] idat = read(4); checkEquality(idat, "IDAT".getBytes()); byte[] data = read(size); Inflater inflater = new Inflater(); inflater.setInput(data, 0, size); int color; try { switch (mode) { case PNGEncoder.BW_MODE: { int bytes = (int)(width / 8); if((width % 8) != 0) { bytes++; } byte colorset; byte[] row = new byte[bytes]; for (int y = 0; y < height; y++) { inflater.inflate(new byte[1]); inflater.inflate(row); for (int x = 0; x < bytes; x++) { colorset = row[x]; for (int sh = 0; sh < 8; sh++) { if(x * 8 + sh >= width) { break; } if((colorset & 0x80) == 0x80) { result.setRGB(x * 8 + sh, y, Color.white.getRGB()); } else { result.setRGB(x * 8 + sh, y, Color.black.getRGB()); } colorset <<= 1; } } } } break; case PNGEncoder.GREYSCALE_MODE: { byte[] row = new byte[width]; for (int y = 0; y < height; y++) { inflater.inflate(new byte[1]); inflater.inflate(row); for (int x = 0; x < width; x++) { color = row[x]; result.setRGB(x, y, (color << 16) + (color << 8) + color); } } } break; case PNGEncoder.COLOR_MODE: { byte[] row = new byte[width * 3]; for (int y = 0; y < height; y++) { inflater.inflate(new byte[1]); inflater.inflate(row); for (int x = 0; x < width; x++) { result.setRGB(x, y, ((row[x * 3 + 0]&0xff) << 16) + ((row[x * 3 + 1]&0xff) << 8) + ((row[x * 3 + 2]&0xff))); } } } } } catch(DataFormatException e) { throw(new JemmyException("ZIP error", e)); } readInt();//!!crc readInt();//0 byte[] iend = read(4); checkEquality(iend, "IEND".getBytes()); readInt();//!!crc if (closeStream) { in.close(); } return(result); } /** * Decodes image from file. * @param fileName a file to read image from * @return a BufferedImage instance. */ public static BufferedImage decode(String fileName) { try { return(new PNGDecoder(new FileInputStream(fileName)).decode()); } catch(IOException e) { throw(new JemmyException("IOException during image reading", e)); } } /** * Decodes image from input stream * @param inputStream a file to read image from * @param closeStream requests method to close the stream after the image is read * @return a BufferedImage instance. */ public static BufferedImage decode(InputStream inputStream, boolean closeStream) { try { return(new PNGDecoder(inputStream).decode(closeStream)); } catch(IOException e) { throw(new JemmyException("IOException during image reading", e)); } } /** * Decodes image from resource. * @param loader ClassLoader to use to get the resource * @param resource Image resource name * @return a BufferedImage instance. */ public static BufferedImage decode(ClassLoader loader, String resource) { try { InputStream resourceStream = loader.getResourceAsStream(resource); if (resourceStream == null) { throw new JemmyException("Resouce '" + resource + "' could not be found!"); } return(new PNGDecoder(resourceStream).decode()); } catch(IOException e) { throw(new JemmyException("IOException during image reading", e)); } } }