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Java > Open Source Codes > com > imagero > uio > io > TIFFStripInputStream


1 /*
2  * Copyright (c) Andrey Kuznetsov. All Rights Reserved.
3  *
4  * http://uio.imagero.com
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions are met:
8  *
9  * o Redistributions of source code must retain the above copyright notice,
10  * this list of conditions and the following disclaimer.
11  *
12  * o Redistributions in binary form must reproduce the above copyright notice,
13  * this list of conditions and the following disclaimer in the documentation
14  * and/or other materials provided with the distribution.
15  *
16  * o Neither the name of imagero Andrei Kouznetsov nor the names of
17  * its contributors may be used to endorse or promote products derived
18  * from this software without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
24  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
27  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
28  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
29  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
30  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31  */
32 package com.imagero.uio.io;
33
34 import com.imagero.uio.RandomAccess;
35
36 import java.io.IOException JavaDoc;
37
38 /**
39  * InputStream over all strips
40  * @author Andrei Kouznetsov
41  */
42 public class TIFFStripInputStream extends RandomAccessInputStream {
43
44     int[] stripOffsets, stripByteCount;
45
46     int currentStrip = -1;
47     long stripLimit;
48     int markStrip;
49
50     public TIFFStripInputStream(RandomAccess ra, int[] stripByteCount, int[] stripOffsets) {
51         super(ra);
52         this.stripByteCount = stripByteCount;
53         this.stripOffsets = stripOffsets;
54     }
55
56     public TIFFStripInputStream(RandomAccess ra, long startPos, int[] stripByteCount, int[] stripOffsets) {
57         super(ra, startPos);
58         this.stripByteCount = stripByteCount;
59         this.stripOffsets = stripOffsets;
60     }
61
62     protected void checkPos() throws IOException JavaDoc {
63         if(pos > stripLimit || currentStrip == -1) {
64 // Sys.out.println("currentStrip:" + currentStrip);
65 if(currentStrip >= stripOffsets.length) {
66                 throw new IOException JavaDoc();
67             }
68             currentStrip++;
69             stripLimit = stripOffsets[currentStrip] + stripByteCount[currentStrip];
70             pos = stripOffsets[currentStrip];
71
72 // File ft = new File(TiffReader.workDir + "tables" + currentStrip + ".jpg");
73 // FileOutputStream fout = new FileOutputStream(ft);
74 // in.seek(pos);
75 // byte [] b = new byte[256];
76 // for(int i = 0; i < stripByteCount[currentStrip];) {
77 // int r = in.read(b);
78 // if(r < 0) {
79 // break;
80 // }
81 // fout.write(b, 0, r);
82 // i =+ r;
83 // }
84 // fout.close();
85 }
86         super.checkPos();
87     }
88
89     synchronized public int read(byte[] b, int off, int len) throws IOException JavaDoc {
90         return super.read(b, off, Math.min(len, (int)(stripLimit - pos)));
91     }
92
93     public void mark(int i) {
94         super.mark(i);
95         markStrip = currentStrip;
96     }
97
98     public void reset() throws IOException JavaDoc {
99         super.reset();
100         currentStrip = markStrip;
101     }
102
103     public long skip(long l) throws IOException JavaDoc {
104         int lsi = stripOffsets.length - 1;
105         long limit = stripOffsets[lsi] + stripByteCount[lsi];
106         long remaining = l;
107         while(remaining > 0) {
108             checkPos();
109             long cs = Math.min(remaining, stripLimit - pos);
110             if(cs > limit - pos) {
111                 cs = limit - pos;
112                 remaining -= cs;
113                 pos += cs;
114                 break;
115             }
116             remaining -= cs;
117             pos += cs;
118         }
119         return l - remaining;
120     }
121
122     public int available() {
123         try {
124             return super.available();
125         }
126         catch(IOException JavaDoc e) {
127             e.printStackTrace();
128         }
129         return 0;
130     }
131
132     public long getPos() {
133         long res = 0;
134         for(int i = 0; i < currentStrip; i++) {
135             res += stripByteCount[i];
136         }
137         res += stripByteCount[currentStrip]
138             - (stripByteCount[currentStrip] + stripOffsets[currentStrip] - pos);
139         return res;
140     }
141 }
142
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