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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
package com.lowagie.bc.asn1;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Vector;
abstract public class ASN1Set
extends DERObject
{
protected Vector set = new Vector();
/**
* return an ASN1Set from the given object.
*
* @param obj the object we want converted.
* @exception IllegalArgumentException if the object cannot be converted.
*/
public static ASN1Set getInstance(
Object obj)
{
if (obj == null || obj instanceof ASN1Set)
{
return (ASN1Set)obj;
}
throw new IllegalArgumentException("unknown object in getInstance");
}
/**
* Return an ASN1 set from a tagged object. There is a special
* case here, if an object appears to have been explicitly tagged on
* reading but we were expecting it to be implictly tagged in the
* normal course of events it indicates that we lost the surrounding
* set - so we need to add it back (this will happen if the tagged
* object is a sequence that contains other sequences). If you are
* dealing with implicitly tagged sets you really <b>should</b>
* be using this method.
*
* @param obj the tagged object.
* @param explicit true if the object is meant to be explicitly tagged
* false otherwise.
* @exception IllegalArgumentException if the tagged object cannot
* be converted.
*/
public static ASN1Set getInstance(
ASN1TaggedObject obj,
boolean explicit)
{
if (explicit)
{
if (!obj.isExplicit())
{
throw new IllegalArgumentException("object implicit - explicit expected.");
}
return (ASN1Set)obj.getObject();
}
else
{
//
// constructed object which appears to be explicitly tagged
// and it's really implicit means we have to add the
// surrounding sequence.
//
if (obj.isExplicit())
{
ASN1Set set = new DERSet(obj.getObject());
return set;
}
else
{
if (obj.getObject() instanceof ASN1Set)
{
return (ASN1Set)obj.getObject();
}
//
// in this case the parser returns a sequence, convert it
// into a set.
//
ASN1EncodableVector v = new ASN1EncodableVector();
if (obj.getObject() instanceof ASN1Sequence)
{
ASN1Sequence s = (ASN1Sequence)obj.getObject();
Enumeration e = s.getObjects();
while (e.hasMoreElements())
{
v.add((DEREncodable)e.nextElement());
}
return new DERSet(v);
}
}
}
throw new IllegalArgumentException(
"unknown object in getInstanceFromTagged");
}
public ASN1Set()
{
}
public Enumeration getObjects()
{
return set.elements();
}
/**
* return the object at the set postion indicated by index.
*
* @param index the set number (starting at zero) of the object
* @return the object at the set postion indicated by index.
*/
public DEREncodable getObjectAt(
int index)
{
return (DEREncodable)set.elementAt(index);
}
/**
* return the number of objects in this set.
*
* @return the number of objects in this set.
*/
public int size()
{
return set.size();
}
public int hashCode()
{
Enumeration e = this.getObjects();
int hashCode = 0;
while (e.hasMoreElements())
{
hashCode ^= e.nextElement().hashCode();
}
return hashCode;
}
public boolean equals(
Object o)
{
if (o == null || !(o instanceof ASN1Set))
{
return false;
}
ASN1Set other = (ASN1Set)o;
if (this.size() != other.size())
{
return false;
}
Enumeration s1 = this.getObjects();
Enumeration s2 = other.getObjects();
while (s1.hasMoreElements())
{
if (!s1.nextElement().equals(s2.nextElement()))
{
return false;
}
}
return true;
}
protected void addObject(
DEREncodable obj)
{
set.addElement(obj);
}
abstract void encode(DEROutputStream out)
throws IOException;
}
|
