blob: 4f39e30a93be33b20950234e2c086d53c2198e79 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id$ */
package org.apache.fop.image.analyser;
// Java
import java.io.InputStream;
import java.io.IOException;
// FOP
import org.apache.fop.image.FopImage;
import org.apache.fop.apps.FOUserAgent;
/**
* ImageReader object for BMP image type.
*
* @author Pankaj Narula
* @version $Id: BMPReader.java,v 1.8 2003/03/06 21:25:45 jeremias Exp $
*/
public class BMPReader implements ImageReader {
/** Length of the BMP header */
protected static final int BMP_SIG_LENGTH = 26;
/** @see org.apache.fop.image.analyser.ImageReader */
public FopImage.ImageInfo verifySignature(String uri, InputStream bis,
FOUserAgent ua) throws IOException {
byte[] header = getDefaultHeader(bis);
boolean supported = ((header[0] == (byte) 0x42)
&& (header[1] == (byte) 0x4d));
if (supported) {
FopImage.ImageInfo info = getDimension(header);
info.inputStream = bis;
return info;
} else {
return null;
}
}
/**
* Returns the MIME type supported by this implementation.
*
* @return The MIME type
*/
public String getMimeType() {
return "image/bmp";
}
private FopImage.ImageInfo getDimension(byte[] header) {
FopImage.ImageInfo info = new FopImage.ImageInfo();
info.mimeType = getMimeType();
// little endian notation
int byte1 = header[18] & 0xff;
int byte2 = header[19] & 0xff;
int byte3 = header[20] & 0xff;
int byte4 = header[21] & 0xff;
long l = (long) ((byte4 << 24) | (byte3 << 16)
| (byte2 << 8) | byte1);
info.width = (int) (l & 0xffffffff);
byte1 = header[22] & 0xff;
byte2 = header[23] & 0xff;
byte3 = header[24] & 0xff;
byte4 = header[25] & 0xff;
l = (long) ((byte4 << 24) | (byte3 << 16) | (byte2 << 8) | byte1);
info.height = (int) (l & 0xffffffff);
return info;
}
private byte[] getDefaultHeader(InputStream imageStream)
throws IOException {
byte[] header = new byte[BMP_SIG_LENGTH];
try {
imageStream.mark(BMP_SIG_LENGTH + 1);
imageStream.read(header);
imageStream.reset();
} catch (IOException ex) {
try {
imageStream.reset();
} catch (IOException exbis) {
// throw the original exception, not this one
}
throw ex;
}
return header;
}
}
|
