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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package org.jemmy.image;
24
25 import java.awt.Color;
26
27 import java.awt.image.BufferedImage;
28
29 import java.io.InputStream;
30 import java.io.IOException;
31 import java.io.FileInputStream;
32
33 import org.jemmy.JemmyException;
34
35 import java.util.zip.DataFormatException;
36 import java.util.zip.Inflater;
37
38 /**
39 * Allows to load PNG graphical file.
40 * @author Alexandre Iline
41 */
42 public class PNGDecoder extends Object {
43
44 InputStream in;
45
46 /**
47 * Constructs a PNGDecoder object.
48 * @param in input stream to read PNG image from.
49 */
50 public PNGDecoder(InputStream in) {
51 this.in = in;
52 }
53
54 byte read() throws IOException {
55 byte b = (byte)in.read();
56 return(b);
57 }
58
59 int readInt() throws IOException {
60 byte b[] = read(4);
61 return(((b[0]&0xff)<<24) +
62 ((b[1]&0xff)<<16) +
63 ((b[2]&0xff)<<8) +
64 ((b[3]&0xff)));
65 }
66
67 byte[] read(int count) throws IOException {
68 byte[] result = new byte[count];
69 for(int i = 0; i < count; i++) {
70 result[i] = read();
71 }
72 return(result);
73 }
74
75 boolean compare(byte[] b1, byte[] b2) {
76 if(b1.length != b2.length) {
77 return(false);
78 }
79 for(int i = 0; i < b1.length; i++) {
80 if(b1[i] != b2[i]) {
81 return(false);
82 }
83 }
84 return(true);
85 }
86
87 void checkEquality(byte[] b1, byte[] b2) {
88 if(!compare(b1, b2)) {
89 throw(new JemmyException("Format error"));
90 }
91 }
92
93 /**
94 * Decodes image from an input stream passed into constructor.
95 * @return a BufferedImage object
96 * @throws IOException
97 */
98 public BufferedImage decode() throws IOException {
99 return decode(true);
100 }
101
102 /**
103 * Decodes image from an input stream passed into constructor.
104 * @return a BufferedImage object
105 * @param closeStream requests method to close the stream after the image is read
106 * @throws IOException
107 */
108 public BufferedImage decode(boolean closeStream) throws IOException {
109
110 byte[] id = read(12);
111 checkEquality(id, new byte[] {-119, 80, 78, 71, 13, 10, 26, 10, 0, 0, 0, 13});
112
113 byte[] ihdr = read(4);
114 checkEquality(ihdr, "IHDR".getBytes());
115
116 int width = readInt();
117 int height = readInt();
118
119 BufferedImage result = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
120
121 byte[] head = read(5);
122 int mode;
123 if(compare(head, new byte[]{1, 0, 0, 0, 0})) {
124 mode = PNGEncoder.BW_MODE;
125 } else if(compare(head, new byte[]{8, 0, 0, 0, 0})) {
126 mode = PNGEncoder.GREYSCALE_MODE;
127 } else if(compare(head, new byte[]{8, 2, 0, 0, 0})) {
128 mode = PNGEncoder.COLOR_MODE;
129 } else {
130 throw(new JemmyException("Format error"));
131 }
132
133 readInt();//!!crc
134
135 int size = readInt();
136
137 byte[] idat = read(4);
138 checkEquality(idat, "IDAT".getBytes());
139
140 byte[] data = read(size);
141
142
143 Inflater inflater = new Inflater();
144 inflater.setInput(data, 0, size);
145
146 int color;
147
148 try {
149 switch (mode) {
150 case PNGEncoder.BW_MODE:
151 {
152 int bytes = (int)(width / 8);
153 if((width % 8) != 0) {
154 bytes++;
155 }
156 byte colorset;
157 byte[] row = new byte[bytes];
158 for (int y = 0; y < height; y++) {
159 inflater.inflate(new byte[1]);
160 inflater.inflate(row);
161 for (int x = 0; x < bytes; x++) {
162 colorset = row[x];
163 for (int sh = 0; sh < 8; sh++) {
164 if(x * 8 + sh >= width) {
165 break;
166 }
167 if((colorset & 0x80) == 0x80) {
168 result.setRGB(x * 8 + sh, y, Color.white.getRGB());
169 } else {
170 result.setRGB(x * 8 + sh, y, Color.black.getRGB());
171 }
172 colorset <<= 1;
173 }
174 }
175 }
176 }
177 break;
178 case PNGEncoder.GREYSCALE_MODE:
179 {
180 byte[] row = new byte[width];
181 for (int y = 0; y < height; y++) {
182 inflater.inflate(new byte[1]);
183 inflater.inflate(row);
184 for (int x = 0; x < width; x++) {
185 color = row[x];
186 result.setRGB(x, y, (color << 16) + (color << 8) + color);
187 }
188 }
189 }
190 break;
191 case PNGEncoder.COLOR_MODE:
192 {
193 byte[] row = new byte[width * 3];
194 for (int y = 0; y < height; y++) {
195 inflater.inflate(new byte[1]);
196 inflater.inflate(row);
197 for (int x = 0; x < width; x++) {
198 result.setRGB(x, y,
199 ((row[x * 3 + 0]&0xff) << 16) +
200 ((row[x * 3 + 1]&0xff) << 8) +
201 ((row[x * 3 + 2]&0xff)));
202 }
203 }
204 }
205 }
206 } catch(DataFormatException e) {
207 throw(new JemmyException("ZIP error", e));
208 }
209
210 readInt();//!!crc
211 readInt();//0
212
213 byte[] iend = read(4);
214 checkEquality(iend, "IEND".getBytes());
215
216 readInt();//!!crc
217 if (closeStream) {
218 in.close();
219 }
220
221 return(result);
222 }
223
224 /**
225 * Decodes image from file.
226 * @param fileName a file to read image from
227 * @return a BufferedImage instance.
228 */
229 public static BufferedImage decode(String fileName) {
230 try {
231 return(new PNGDecoder(new FileInputStream(fileName)).decode());
232 } catch(IOException e) {
233 throw(new JemmyException("IOException during image reading", e));
234 }
235 }
236
237 /**
238 * Decodes image from input stream
239 * @param inputStream a file to read image from
240 * @param closeStream requests method to close the stream after the image is read
241 * @return a BufferedImage instance.
242 */
243 public static BufferedImage decode(InputStream inputStream, boolean closeStream) {
244 try {
245 return(new PNGDecoder(inputStream).decode(closeStream));
246 } catch(IOException e) {
247 throw(new JemmyException("IOException during image reading", e));
248 }
249 }
250
251 /**
252 * Decodes image from resource.
253 * @param loader ClassLoader to use to get the resource
254 * @param resource Image resource name
255 * @return a BufferedImage instance.
256 */
257 public static BufferedImage decode(ClassLoader loader, String resource) {
258 try {
259 InputStream resourceStream = loader.getResourceAsStream(resource);
260 if (resourceStream == null) {
261 throw new JemmyException("Resouce '" + resource + "' could not be found!");
262 }
263 return(new PNGDecoder(resourceStream).decode());
264 } catch(IOException e) {
265 throw(new JemmyException("IOException during image reading", e));
266 }
267 }
268
269 }