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Java > Open Source Codes > com > imagero > uio > io > RLE8InputStream


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 java.io.IOException JavaDoc;
35 import java.io.InputStream JavaDoc;
36
37 /**
38  * PackBits decoder
39  *
40  * @author Andrei Kouznetsov
41  */
42 public class RLE8InputStream extends RLEInputStream {
43
44     int numSamples, value;
45     boolean copyLiter;
46     boolean ignoreByte;
47
48     public RLE8InputStream(InputStream JavaDoc in) {
49         super(in);
50     }
51
52     public int read() throws IOException JavaDoc {
53         if (numSamples == 0) {
54             if (ignoreByte) {
55                 ignoreByte = false;
56                 /*int ignored = */in.read();
57             }
58             int l = in.read();
59             if (l == 0) {
60                 value = in.read();
61                 switch (value) {
62                     case 0:
63                         throw new EndOfLineException();
64                     case 1:
65                         finished = true;
66                         throw new EndOfBitmapException();
67                     case 2:
68                         int x = in.read();
69                         int y = in.read();
70                         throw new DeltaRecordException(Integer.toHexString(x) + Integer.toHexString(y));
71                     default:
72                         copyLiter = true;
73                         numSamples = value;
74                         if ((numSamples & 1) != 0) {
75                             ignoreByte = true;
76                         }
77                 }
78             }
79             else {
80                 numSamples = l;
81                 copyLiter = false;
82                 value = in.read();
83             }
84         }
85         numSamples--;
86         if (copyLiter) {
87             return in.read();
88         }
89         else {
90             return value;
91         }
92     }
93 }
94
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