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Java > Open Source Codes > org > apache > fop > image > analyser > TIFFReader


1 /*
2  * $Id: TIFFReader.java,v 1.3.2.1 2003/02/25 13:38:24 jeremias Exp $
3  * ============================================================================
4  * The Apache Software License, Version 1.1
5  * ============================================================================
6  *
7  * Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without modifica-
10  * tion, are permitted provided that the following conditions are met:
11  *
12  * 1. Redistributions of source code must retain the above copyright notice,
13  * this list of conditions and the following disclaimer.
14  *
15  * 2. Redistributions in binary form must reproduce the above copyright notice,
16  * this list of conditions and the following disclaimer in the documentation
17  * and/or other materials provided with the distribution.
18  *
19  * 3. The end-user documentation included with the redistribution, if any, must
20  * include the following acknowledgment: "This product includes software
21  * developed by the Apache Software Foundation (http://www.apache.org/)."
22  * Alternately, this acknowledgment may appear in the software itself, if
23  * and wherever such third-party acknowledgments normally appear.
24  *
25  * 4. The names "FOP" and "Apache Software Foundation" must not be used to
26  * endorse or promote products derived from this software without prior
27  * written permission. For written permission, please contact
28  * apache@apache.org.
29  *
30  * 5. Products derived from this software may not be called "Apache", nor may
31  * "Apache" appear in their name, without prior written permission of the
32  * Apache Software Foundation.
33  *
34  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
35  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
36  * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
37  * APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
38  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
39  * DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
40  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
41  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
42  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
43  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
44  * ============================================================================
45  *
46  * This software consists of voluntary contributions made by many individuals
47  * on behalf of the Apache Software Foundation and was originally created by
48  * James Tauber <jtauber@jtauber.com>. For more information on the Apache
49  * Software Foundation, please see <http://www.apache.org/>.
50  */
51 package org.apache.fop.image.analyser;
52
53 // Java
54 import java.io.BufferedInputStream JavaDoc;
55 import java.io.IOException JavaDoc;
56
57 /**
58  * ImageReader object for TIFF image type.
59  * @author Pankaj Narula, Michael Lee
60  */
61 public class TIFFReader extends AbstractImageReader {
62     protected static final int TIFF_SIG_LENGTH = 8;
63     protected byte[] header;
64
65     public boolean verifySignature(String JavaDoc uri, BufferedInputStream JavaDoc fis)
66             throws IOException JavaDoc {
67         this.imageStream = fis;
68         this.setDefaultHeader();
69         boolean supported = false;
70
71         if (header[0] == (byte)0x49
72                 && header[1]
73                    == (byte)0x49) // first 2 bytes = II (little endian encoding)
74 {
75             // look for '42' in byte 3 and '0' in byte 4
76 if (header[2] == 42 && header[3] == 0)
77                 supported = true;
78         }
79
80         if (header[0] == (byte)0x4D
81                 && header[1]
82                    == (byte)0x4D) // first 2 bytes == MM (big endian encoding)
83 {
84             // look for '42' in byte 4 and '0' in byte 3
85 if (header[2] == 0 && header[3] == 42)
86                 supported = true;
87         }
88
89         if (supported) {
90             setDimension();
91             return true;
92         } else
93             return false;
94     }
95
96     public String JavaDoc getMimeType() {
97         return "image/tiff";
98     }
99
100     protected void setDimension() {
101         // currently not setting the width and height
102 // these are set again by the Jimi image reader.
103 // I suppose I'll do it one day to be complete. Or
104 // someone else will.
105 // Note: bytes 4,5,6,7 contain the byte offset in the stream of the first IFD block
106 /*
107          * //png is always big endian
108          * int byte1 = header[ 16 ] & 0xff;
109          * int byte2 = header[ 17 ] & 0xff;
110          * int byte3 = header[ 18 ] & 0xff;
111          * int byte4 = header[ 19 ] & 0xff;
112          * long l = ( long ) ( ( byte1 << 24 ) | ( byte2 << 16 ) |
113          * ( byte3 << 8 ) | byte4 );
114          * this.width = ( int ) ( l );
115          * byte1 = header[ 20 ] & 0xff;
116          * byte2 = header[ 21 ] & 0xff;
117          * byte3 = header[ 22 ] & 0xff;
118          * byte4 = header[ 23 ] & 0xff;
119          * l = ( long ) ( ( byte1 << 24 ) | ( byte2 << 16 ) | ( byte3 << 8 ) |
120          * byte4 );
121          * this.height = ( int ) ( l );
122          */
123     }
124
125     protected void setDefaultHeader() throws IOException JavaDoc {
126         this.header = new byte[TIFF_SIG_LENGTH];
127         try {
128             this.imageStream.mark(TIFF_SIG_LENGTH + 1);
129             this.imageStream.read(header);
130             this.imageStream.reset();
131         } catch (IOException JavaDoc ex) {
132             try {
133                 this.imageStream.reset();
134             } catch (IOException JavaDoc exbis) {}
135             throw ex;
136         }
137     }
138
139 }
140
141
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