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1
16 package org.apache.cocoon.util;
17
18 import java.io.File  ;
19 import java.io.FileNotFoundException ;
20 import java.io.IOException ;
21 import java.io.BufferedInputStream ;
22 import java.io.FileInputStream ;
23
24
29 final public class ImageUtils {
30
31 final public static ImageProperties getImageProperties(File file) throws FileNotFoundException , IOException , FileFormatException {
32 String type = MIMEUtils.getMIMEType(file);
33
34 if ("image/gif".equals(type)) {
35 return (getGifProperties(file));
36 }
37 else if ("image/jpeg".equals(type)) {
38 return (getJpegProperties(file));
39 }
40 else {
41 return (null);
42 }
43 }
44
45 final public static ImageProperties getJpegProperties(File file) throws FileNotFoundException , IOException , FileFormatException {
46 BufferedInputStream in = null;
47 try {
48 in = new BufferedInputStream (new FileInputStream (file));
49
50 byte[] buf = new byte[2];
52 int count = in.read(buf, 0, 2);
53 if (count < 2) {
54 throw new FileFormatException("Not a valid Jpeg file!");
55 }
56 if ((buf[0]) != (byte) 0xFF || (buf[1]) != (byte) 0xD8) {
57 throw new FileFormatException("Not a valid Jpeg file!");
58 }
59
60 int width = 0;
61 int height = 0;
62 char[] comment = null;
63
64 boolean hasDims = false;
65 boolean hasComment = false;
66 int ch = 0;
67
68 while (ch != 0xDA && !(hasDims && hasComment)) {
69
70 while (ch != 0xFF) {
71 ch = in.read();
72 }
73
74 while (ch == 0xFF) {
75 ch = in.read();
76 }
77
78
79 int length = 256 * in.read();
80 length += in.read();
81 if (length < 2) {
82 throw new FileFormatException("Not a valid Jpeg file!");
83 }
84
85
86 if (ch >= 0xC0 && ch <= 0xC3) {
87 in.read();
88 height = 256 * in.read();
89 height += in.read();
90 width = 256 * in.read();
91 width += in.read();
92 for (int foo = 0; foo < length - 2 - 5; foo++) {
93 in.read();
94 }
95 hasDims = true;
96 }
97 else if (ch == 0xFE) {
98 comment = new char[length-2];
100 for (int foo = 0; foo < length - 2; foo++)
101 comment[foo] = (char) in.read();
102 hasComment = true;
103 }
104 else {
105 for (int foo = 0; foo < length - 2; foo++) {
107 in.read();
108 }
109 }
110 }
111 return (new ImageProperties(width, height, comment, "jpeg"));
112
113 }
114 finally {
115 if (in != null) {
116 try {
117 in.close();
118 }
119 catch (IOException e) {
120 }
121 }
122 }
123 }
124
125 final public static ImageProperties getGifProperties(File file) throws FileNotFoundException , IOException , FileFormatException {
126 BufferedInputStream in = null;
127 try {
128 in = new BufferedInputStream (new FileInputStream (file));
129 byte[] buf = new byte[10];
130 int count = in.read(buf, 0, 10);
131 if (count < 10) {
132 throw new FileFormatException("Not a valid Gif file!");
133 }
134 if ((buf[0]) != (byte) 'G' || (buf[1]) != (byte) 'I' || (buf[2]) != (byte) 'F') {
135 throw new FileFormatException("Not a valid Gif file!");
136 }
137
138 int w1 = (buf[6] & 0xff) | (buf[6] & 0x80);
139 int w2 = (buf[7] & 0xff) | (buf[7] & 0x80);
140 int h1 = (buf[8] & 0xff) | (buf[8] & 0x80);
141 int h2 = (buf[9] & 0xff) | (buf[9] & 0x80);
142
143 int width = w1 + (w2 << 8);
144 int height = h1 + (h2 << 8);
145
146 return (new ImageProperties(width, height, null,"gif"));
147
148 }
149 finally {
150 if (in != null) {
151 try {
152 in.close();
153 }
154 catch (IOException e) {
155 }
156 }
157 }
158 }
159 }
160 |
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