1 /*
2 * Copyright (c) 1995, 2018, 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 /*-
27 * Reads xbitmap format images into a DIBitmap structure.
28 */
29 package sun.awt.image;
30
31 import java.io.*;
32 import java.awt.image.*;
33
34 /**
35 * Parse files of the form:
36 *
37 * #define foo_width w
38 * #define foo_height h
39 * static char foo_bits[] = {
40 * 0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,
41 * 0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,
42 * 0xnn,0xnn,0xnn,0xnn};
43 *
44 * @author James Gosling
45 */
46 public class XbmImageDecoder extends ImageDecoder {
47 private static byte[] XbmColormap = {(byte) 255, (byte) 255, (byte) 255,
48 0, 0, 0};
49 private static int XbmHints = (ImageConsumer.TOPDOWNLEFTRIGHT |
50 ImageConsumer.COMPLETESCANLINES |
51 ImageConsumer.SINGLEPASS |
52 ImageConsumer.SINGLEFRAME);
53
54 public XbmImageDecoder(InputStreamImageSource src, InputStream is) {
55 super(src, is);
56 if (!(input instanceof BufferedInputStream)) {
57 // If the topmost stream is a metered stream,
58 // we take forever to decode the image...
59 input = new BufferedInputStream(input, 80);
60 }
61 }
62
63
64 /**
65 * An error has occurred. Throw an exception.
66 */
67 private static void error(String s1) throws ImageFormatException {
68 throw new ImageFormatException(s1);
69 }
70
71 /**
72 * produce an image from the stream.
73 */
74 public void produceImage() throws IOException, ImageFormatException {
75 char[] nm = new char[80];
76 int c;
77 int i = 0;
78 int state = 0;
79 int H = 0;
80 int W = 0;
81 int x = 0;
82 int y = 0;
83 boolean start = true;
84 byte[] raster = null;
85 IndexColorModel model = null;
86 while (!aborted && (c = input.read()) != -1) {
87 if ('a' <= c && c <= 'z' ||
88 'A' <= c && c <= 'Z' ||
89 '0' <= c && c <= '9' || c == '#' || c == '_') {
90 if (i < 78)
91 nm[i++] = (char) c;
92 } else if (i > 0) {
93 int nc = i;
94 i = 0;
95 if (start) {
96 if (nc != 7 ||
97 nm[0] != '#' ||
98 nm[1] != 'd' ||
99 nm[2] != 'e' ||
100 nm[3] != 'f' ||
101 nm[4] != 'i' ||
102 nm[5] != 'n' ||
103 nm[6] != 'e')
104 {
105 error("Not an XBM file");
106 }
107 start = false;
108 }
109 if (nm[nc - 1] == 'h')
110 state = 1; /* expecting width */
111 else if (nm[nc - 1] == 't' && nc > 1 && nm[nc - 2] == 'h')
112 state = 2; /* expecting height */
113 else if (nc > 2 && state < 0 && nm[0] == '0' && nm[1] == 'x') {
114 int n = 0;
115 for (int p = 2; p < nc; p++) {
116 c = nm[p];
117 if ('0' <= c && c <= '9')
118 c = c - '0';
119 else if ('A' <= c && c <= 'Z')
120 c = c - 'A' + 10;
121 else if ('a' <= c && c <= 'z')
122 c = c - 'a' + 10;
123 else
124 c = 0;
125 n = n * 16 + c;
126 }
127 for (int mask = 1; mask <= 0x80; mask <<= 1) {
128 if (x < W) {
129 if ((n & mask) != 0)
130 raster[x] = 1;
131 else
132 raster[x] = 0;
133 }
134 x++;
135 }
136 if (x >= W) {
137 if (setPixels(0, y, W, 1, model, raster, 0, W) <= 0) {
138 return;
139 }
140 x = 0;
141 if (y++ >= H) {
142 break;
143 }
144 }
145 } else {
146 int n = 0;
147 for (int p = 0; p < nc; p++)
148 if ('0' <= (c = nm[p]) && c <= '9')
149 n = n * 10 + c - '0';
150 else {
151 n = -1;
152 break;
153 }
154 if (n > 0 && state > 0) {
155 if (state == 1)
156 W = n;
157 else
158 H = n;
159 if (W == 0 || H == 0)
160 state = 0;
161 else {
162 model = new IndexColorModel(8, 2, XbmColormap,
163 0, false, 0);
164 setDimensions(W, H);
165 setColorModel(model);
166 setHints(XbmHints);
167 headerComplete();
168 raster = new byte[W];
169 state = -1;
170 }
171 }
172 }
173 }
174 }
175 input.close();
176 imageComplete(ImageConsumer.STATICIMAGEDONE, true);
177 }
178 }