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
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
package org.bouncycastle.cms;
import java.io.IOException;
import java.io.OutputStream;
import java.util.zip.DeflaterOutputStream;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.BERSequenceGenerator;
import org.bouncycastle.asn1.DERSequenceGenerator;
import org.bouncycastle.asn1.cms.CMSObjectIdentifiers;
import org.bouncycastle.operator.OutputCompressor;
/**
* General class for generating a compressed CMS message stream.
* <p>
* A simple example of usage.
* </p>
* <pre>
* CMSCompressedDataStreamGenerator gen = new CMSCompressedDataStreamGenerator();
*
* OutputStream cOut = gen.open(outputStream, new ZlibCompressor());
*
* cOut.write(data);
*
* cOut.close();
* </pre>
*/
public class CMSCompressedDataStreamGenerator
{
public static final String ZLIB = "1.2.840.113549.1.9.16.3.8";
private int _bufferSize;
/**
* base constructor
*/
public CMSCompressedDataStreamGenerator()
{
}
/**
* Set the underlying string size for encapsulated data
*
* @param bufferSize length of octet strings to buffer the data.
*/
public void setBufferSize(
int bufferSize)
{
_bufferSize = bufferSize;
}
/**
* @deprecated use open(OutputStream, ContentCompressor)
*/
public OutputStream open(
OutputStream out,
String compressionOID)
throws IOException
{
return open(out, CMSObjectIdentifiers.data.getId(), compressionOID);
}
/**
* @deprecated use open(OutputStream, ASN1ObjectIdentifier, ContentCompressor)
*/
public OutputStream open(
OutputStream out,
String contentOID,
String compressionOID)
throws IOException
{
BERSequenceGenerator sGen = new BERSequenceGenerator(out);
sGen.addObject(CMSObjectIdentifiers.compressedData);
//
// Compressed Data
//
BERSequenceGenerator cGen = new BERSequenceGenerator(sGen.getRawOutputStream(), 0, true);
cGen.addObject(new ASN1Integer(0));
//
// AlgorithmIdentifier
//
DERSequenceGenerator algGen = new DERSequenceGenerator(cGen.getRawOutputStream());
algGen.addObject(new ASN1ObjectIdentifier(ZLIB));
algGen.close();
//
// Encapsulated ContentInfo
//
BERSequenceGenerator eiGen = new BERSequenceGenerator(cGen.getRawOutputStream());
eiGen.addObject(new ASN1ObjectIdentifier(contentOID));
OutputStream octetStream = CMSUtils.createBEROctetOutputStream(
eiGen.getRawOutputStream(), 0, true, _bufferSize);
return new CmsCompressedOutputStream(
new DeflaterOutputStream(octetStream), sGen, cGen, eiGen);
}
public OutputStream open(
OutputStream out,
OutputCompressor compressor)
throws IOException
{
return open(CMSObjectIdentifiers.data, out, compressor);
}
/**
* Open a compressing output stream.
*
* @param contentOID
* @param out
* @param compressor
* @return
* @throws IOException
*/
public OutputStream open(
ASN1ObjectIdentifier contentOID,
OutputStream out,
OutputCompressor compressor)
throws IOException
{
BERSequenceGenerator sGen = new BERSequenceGenerator(out);
sGen.addObject(CMSObjectIdentifiers.compressedData);
//
// Compressed Data
//
BERSequenceGenerator cGen = new BERSequenceGenerator(sGen.getRawOutputStream(), 0, true);
cGen.addObject(new ASN1Integer(0));
//
// AlgorithmIdentifier
//
cGen.addObject(compressor.getAlgorithmIdentifier());
//
// Encapsulated ContentInfo
//
BERSequenceGenerator eiGen = new BERSequenceGenerator(cGen.getRawOutputStream());
eiGen.addObject(contentOID);
OutputStream octetStream = CMSUtils.createBEROctetOutputStream(
eiGen.getRawOutputStream(), 0, true, _bufferSize);
return new CmsCompressedOutputStream(
compressor.getOutputStream(octetStream), sGen, cGen, eiGen);
}
private class CmsCompressedOutputStream
extends OutputStream
{
private OutputStream _out;
private BERSequenceGenerator _sGen;
private BERSequenceGenerator _cGen;
private BERSequenceGenerator _eiGen;
CmsCompressedOutputStream(
OutputStream out,
BERSequenceGenerator sGen,
BERSequenceGenerator cGen,
BERSequenceGenerator eiGen)
{
_out = out;
_sGen = sGen;
_cGen = cGen;
_eiGen = eiGen;
}
public void write(
int b)
throws IOException
{
_out.write(b);
}
public void write(
byte[] bytes,
int off,
int len)
throws IOException
{
_out.write(bytes, off, len);
}
public void write(
byte[] bytes)
throws IOException
{
_out.write(bytes);
}
public void close()
throws IOException
{
_out.close();
_eiGen.close();
_cGen.close();
_sGen.close();
}
}
}
|
