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Java > Open Source Codes > com > imagero > uio > buffer > arrays > IntArrayBufferManager


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.buffer.arrays;
33
34 import com.imagero.uio.buffer.MemoryAccessManager;
35
36 /**
37  * Gives possibility to read and write an int array using RandomAccess interface
38  *
39  * @author Andrei Kouznetsov
40  * Date: 01.06.2004
41  * Time: 22:35:58
42  */
43 public class IntArrayBufferManager extends AbstractArrayBufferManager {
44
45     int[] data;
46
47     /**
48      * Create IntArrayBufferManager with standard tile size
49      *
50      * @param data int array
51      */
52     public IntArrayBufferManager(int[] data) {
53         this(data, Math.min(TILE_SIZE, data.length));
54     }
55
56     /**
57      * @param data int array
58      * @param size tile length (for Buffer)
59      */
60     public IntArrayBufferManager(int[] data, int size) {
61         this(data, 0, data.length, size);
62     }
63
64     /**
65      * @param data int array
66      * @param offset start offset in <code>data</code>
67      * @param length length to read
68      */
69     public IntArrayBufferManager(int[] data, int offset, int length) {
70         this(data, offset, length, TILE_SIZE);
71     }
72
73     /**
74      * @param data int array
75      * @param offset start offset in <code>data</code>
76      * @param length length to read
77      * @param size tile length (for Buffer)
78      */
79     public IntArrayBufferManager(int[] data, int offset, int length, int size) {
80         this.data = data;
81         this.tileSize = size;
82         this.unitSize = 4;
83         this.length = length;
84         this.offset = offset;
85         accessManager = MemoryAccessManager.createMemoryAccessManager();
86     }
87
88     /**
89      * write appropriate unit (int) in LITTLE_ENDIAN order
90      *
91      * @param source source byte array
92      * @param sourceOffset offset in source array
93      * @param destOffset offset in destination array
94      *
95      * @return new offset in source array (for next writeUnitXX)
96      */
97     protected int writeUnitLE(byte[] source, int sourceOffset, int destOffset) {
98         int v = ((source[sourceOffset++] & 0xFF))
99                 | (((source[sourceOffset++] & 0xFF)) << 8)
100                 | (((source[sourceOffset++] & 0xFF)) << 16)
101                 | (((source[sourceOffset++] & 0xFF)) << 24);
102         data[destOffset] = v;
103         return sourceOffset;
104     }
105
106     /**
107      * write appropriate unit (int) in BIG_ENDIAN order
108      *
109      * @param source source byte array
110      * @param sourceOffset offset in source array
111      * @param destOffset offset in destination array
112      *
113      * @return new offset in source array (for next writeUnitXX)
114      */
115     protected int writeUnitBE(byte[] source, int sourceOffset, int destOffset) {
116         int v = ((source[sourceOffset++] & 0xFF) << 24)
117                 | ((source[sourceOffset++] & 0xFF) << 16)
118                 | ((source[sourceOffset++] & 0xFF) << 8)
119                 | (source[sourceOffset++] & 0xFF);
120         data[destOffset] = v;
121         return sourceOffset;
122     }
123
124     /**
125      * read unit (int) in BIG_ENDIAN order
126      *
127      * @param offset offset in source array
128      * @param dest byte array (destination)
129      * @param destOffset offset in destination array
130      *
131      * @return offset in destination array (updated)
132      */
133     protected int readUnitBE(int offset, byte[] dest, int destOffset) {
134         int v = data[offset];
135         dest[destOffset++] = (byte) ((v >>> 24) & 0xFF);
136         dest[destOffset++] = (byte) ((v >>> 16) & 0xFF);
137         dest[destOffset++] = (byte) ((v >>> 8) & 0xFF);
138         dest[destOffset++] = (byte) (v & 0xFF);
139         return destOffset;
140     }
141
142     /**
143      * read appropriate unit (int) in LITTLE_ENDIAN order
144      *
145      * @param offset offset in source array
146      * @param dest byte array (destination)
147      * @param destOffset offset in destination array
148      *
149      * @return offset in destination array (updated)
150      */
151     protected int readUnitLE(int offset, byte[] dest, int destOffset) {
152         int v = data[offset];
153         dest[destOffset++] = (byte) (v & 0xFF);
154         dest[destOffset++] = (byte) ((v >>> 8) & 0xFF);
155         dest[destOffset++] = (byte) ((v >>> 16) & 0xFF);
156         dest[destOffset++] = (byte) ((v >>> 24) & 0xFF);
157         return destOffset;
158     }
159
160     public int getMaxCache() {
161         return 0;
162     }
163
164     public void setMaxCache(int max) {
165     }
166 }
167
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