1 /*
2 * Copyright (c) 2007, 2017, 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 package org.jemmy.image;
26
27 import java.awt.Color;
28
29 import java.awt.image.BufferedImage;
30
31 import java.io.InputStream;
32 import java.io.IOException;
33 import java.io.FileInputStream;
34
35 import org.jemmy.JemmyException;
36
37 import java.util.zip.DataFormatException;
38 import java.util.zip.Inflater;
39
40 /**
41 * Allows to load PNG graphical file.
42 * @author Alexandre Iline
43 */
44 public class PNGDecoder extends Object {
45
46 InputStream in;
47
48 /**
49 * Constructs a PNGDecoder object.
50 * @param in input stream to read PNG image from.
51 */
52 public PNGDecoder(InputStream in) {
53 this.in = in;
54 }
55
56 byte read() throws IOException {
57 byte b = (byte)in.read();
58 return(b);
59 }
60
61 int readInt() throws IOException {
62 byte b[] = read(4);
63 return(((b[0]&0xff)<<24) +
64 ((b[1]&0xff)<<16) +
65 ((b[2]&0xff)<<8) +
66 ((b[3]&0xff)));
67 }
68
69 byte[] read(int count) throws IOException {
70 byte[] result = new byte[count];
71 for(int i = 0; i < count; i++) {
72 result[i] = read();
73 }
74 return(result);
75 }
76
77 boolean compare(byte[] b1, byte[] b2) {
78 if(b1.length != b2.length) {
79 return(false);
80 }
81 for(int i = 0; i < b1.length; i++) {
82 if(b1[i] != b2[i]) {
83 return(false);
84 }
85 }
86 return(true);
87 }
88
89 void checkEquality(byte[] b1, byte[] b2) {
90 if(!compare(b1, b2)) {
91 throw(new JemmyException("Format error"));
92 }
93 }
94
95 /**
96 * Decodes image from an input stream passed into constructor.
97 * @return a BufferedImage object
98 * @throws IOException
99 */
100 public BufferedImage decode() throws IOException {
101 return decode(true);
102 }
103
104 /**
105 * Decodes image from an input stream passed into constructor.
106 * @return a BufferedImage object
107 * @param closeStream requests method to close the stream after the image is read
108 * @throws IOException
109 */
110 public BufferedImage decode(boolean closeStream) throws IOException {
111
112 byte[] id = read(12);
113 checkEquality(id, new byte[] {-119, 80, 78, 71, 13, 10, 26, 10, 0, 0, 0, 13});
114
115 byte[] ihdr = read(4);
116 checkEquality(ihdr, "IHDR".getBytes());
117
118 int width = readInt();
119 int height = readInt();
120
121 BufferedImage result = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
122
123 byte[] head = read(5);
124 int mode;
125 if(compare(head, new byte[]{1, 0, 0, 0, 0})) {
126 mode = PNGEncoder.BW_MODE;
127 } else if(compare(head, new byte[]{8, 0, 0, 0, 0})) {
128 mode = PNGEncoder.GREYSCALE_MODE;
129 } else if(compare(head, new byte[]{8, 2, 0, 0, 0})) {
130 mode = PNGEncoder.COLOR_MODE;
131 } else {
132 throw(new JemmyException("Format error"));
133 }
134
135 readInt();//!!crc
136
137 int size = readInt();
138
139 byte[] idat = read(4);
140 checkEquality(idat, "IDAT".getBytes());
141
142 byte[] data = read(size);
143
144
145 Inflater inflater = new Inflater();
146 inflater.setInput(data, 0, size);
147
148 int color;
149
150 try {
151 switch (mode) {
152 case PNGEncoder.BW_MODE:
153 {
154 int bytes = (int)(width / 8);
155 if((width % 8) != 0) {
156 bytes++;
157 }
158 byte colorset;
159 byte[] row = new byte[bytes];
160 for (int y = 0; y < height; y++) {
161 inflater.inflate(new byte[1]);
162 inflater.inflate(row);
163 for (int x = 0; x < bytes; x++) {
164 colorset = row[x];
165 for (int sh = 0; sh < 8; sh++) {
166 if(x * 8 + sh >= width) {
167 break;
168 }
169 if((colorset & 0x80) == 0x80) {
170 result.setRGB(x * 8 + sh, y, Color.white.getRGB());
171 } else {
172 result.setRGB(x * 8 + sh, y, Color.black.getRGB());
173 }
174 colorset <<= 1;
175 }
176 }
177 }
178 }
179 break;
180 case PNGEncoder.GREYSCALE_MODE:
181 {
182 byte[] row = new byte[width];
183 for (int y = 0; y < height; y++) {
184 inflater.inflate(new byte[1]);
185 inflater.inflate(row);
186 for (int x = 0; x < width; x++) {
187 color = row[x];
188 result.setRGB(x, y, (color << 16) + (color << 8) + color);
189 }
190 }
191 }
192 break;
193 case PNGEncoder.COLOR_MODE:
194 {
195 byte[] row = new byte[width * 3];
196 for (int y = 0; y < height; y++) {
197 inflater.inflate(new byte[1]);
198 inflater.inflate(row);
199 for (int x = 0; x < width; x++) {
200 result.setRGB(x, y,
201 ((row[x * 3 + 0]&0xff) << 16) +
202 ((row[x * 3 + 1]&0xff) << 8) +
203 ((row[x * 3 + 2]&0xff)));
204 }
205 }
206 }
207 }
208 } catch(DataFormatException e) {
209 throw(new JemmyException("ZIP error", e));
210 }
211
212 readInt();//!!crc
213 readInt();//0
214
215 byte[] iend = read(4);
216 checkEquality(iend, "IEND".getBytes());
217
218 readInt();//!!crc
219 if (closeStream) {
220 in.close();
221 }
222
223 return(result);
224 }
225
226 /**
227 * Decodes image from file.
228 * @param fileName a file to read image from
229 * @return a BufferedImage instance.
230 */
231 public static BufferedImage decode(String fileName) {
232 try {
233 return(new PNGDecoder(new FileInputStream(fileName)).decode());
234 } catch(IOException e) {
235 throw(new JemmyException("IOException during image reading", e));
236 }
237 }
238
239 /**
240 * Decodes image from input stream
241 * @param inputStream a file to read image from
242 * @param closeStream requests method to close the stream after the image is read
243 * @return a BufferedImage instance.
244 */
245 public static BufferedImage decode(InputStream inputStream, boolean closeStream) {
246 try {
247 return(new PNGDecoder(inputStream).decode(closeStream));
248 } catch(IOException e) {
249 throw(new JemmyException("IOException during image reading", e));
250 }
251 }
252
253 /**
254 * Decodes image from resource.
255 * @param loader ClassLoader to use to get the resource
256 * @param resource Image resource name
257 * @return a BufferedImage instance.
258 */
259 public static BufferedImage decode(ClassLoader loader, String resource) {
260 try {
261 InputStream resourceStream = loader.getResourceAsStream(resource);
262 if (resourceStream == null) {
263 throw new JemmyException("Resouce '" + resource + "' could not be found!");
264 }
265 return(new PNGDecoder(resourceStream).decode());
266 } catch(IOException e) {
267 throw(new JemmyException("IOException during image reading", e));
268 }
269 }
270
271 }