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
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
/*
* Airport2Analyzer
*
* Copyright (C) 2002, Jonathan Sevy <jsevy@mcs.drexel.edu>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
package airport;
import java.util.*;
import java.io.*;
public class Airport2InfoElementVector
{
private Vector infoElementVector;
public Airport2InfoElementVector()
{
infoElementVector = new Vector();
}
public Airport2InfoElementVector(byte[] retrievedBytes, int numBytes)
{
infoElementVector = new Vector();
ByteArrayInputStream byteStream = new ByteArrayInputStream(retrievedBytes, 0, numBytes);
while (byteStream.available() > 0)
{
Airport2InfoElement element = new Airport2InfoElement();
// read the tag
byte[] tagBytes = new byte[4];
byteStream.read(tagBytes, 0, 4);
element.tag = new String(tagBytes);
//read the type
byte[] typeBytes = new byte[4];
byteStream.read(typeBytes, 0, 4);
element.dataType = getIntegerValue(typeBytes);
//read the length
byte[] lengthBytes = new byte[4];
byteStream.read(lengthBytes, 0, 4);
element.length = getIntegerValue(lengthBytes);
//read the value
byte[] valueBytes = new byte[element.length];
byteStream.read(valueBytes, 0, element.length);
element.value = valueBytes;
infoElementVector.add(element);
}
}
public void add(Airport2InfoElement element)
{
infoElementVector.add(element);
}
public Airport2InfoElement elementAt(int i)
{
return (Airport2InfoElement)infoElementVector.elementAt(i);
}
public byte[] getBytes()
{
int totalSize = 0;
for (int i = 0; i < infoElementVector.size(); i++)
{
totalSize += this.elementAt(i).getSize();
}
byte[] returnBytes = new byte[totalSize];
int startPosition = 0;
for (int i = 0; i < infoElementVector.size(); i++)
{
byte[] elementBytes = this.elementAt(i).getBytes();
if (elementBytes != null)
{
for (int j = 0; j < elementBytes.length; j++)
returnBytes[startPosition + j] = elementBytes[j];
startPosition += elementBytes.length;
}
}
return returnBytes;
}
public String toString()
{
String returnText = new String();
for (int i = 0; i < infoElementVector.size(); i++)
{
Airport2InfoElement theElement = (Airport2InfoElement)infoElementVector.elementAt(i);
returnText += theElement.toString();
returnText += "\n";
}
return returnText;
}
private int getIntegerValue(byte[] valueBytes)
{
int value = 0;
for (int i = 0; i < valueBytes.length; i++)
{
int absValue = valueBytes[i];
if (absValue < 0)
absValue += 256;
value = value*256 + absValue;
}
return value;
}
public int size()
{
return infoElementVector.size();
}
}
|
