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1 package com.lowagie.bc.asn1;
2
3 import java.io.FilterOutputStream;
4 import java.io.IOException;
5 import java.io.OutputStream;
6
7 public class DEROutputStream
8 extends FilterOutputStream implements DERTags
9 {
10 public DEROutputStream(
11 OutputStream os)
12 {
13 super(os);
14 }
15
16 private void writeLength(
17 int length)
18 throws IOException
19 {
20 if (length > 127)
21 {
22 int size = 1;
23 int val = length;
24
25 while ((val >>>= 8) != 0)
26 {
27 size++;
28 }
29
30 write((byte)(size | 0x80));
31
32 for (int i = (size - 1) * 8; i >= 0; i -= 8)
33 {
34 write((byte)(length >> i));
35 }
36 }
37 else
38 {
39 write((byte)length);
40 }
41 }
42
43 void writeEncoded(
44 int tag,
45 byte[] bytes)
46 throws IOException
47 {
48 write(tag);
49 writeLength(bytes.length);
50 write(bytes);
51 }
52
53 protected void writeNull()
54 throws IOException
55 {
56 write(NULL);
57 write(0x00);
58 }
59
60 public void writeObject(
61 Object obj)
62 throws IOException
63 {
64 if (obj == null)
65 {
66 writeNull();
67 }
68 else if (obj instanceof DERObject)
69 {
70 ((DERObject)obj).encode(this);
71 }
72 else if (obj instanceof DEREncodable)
73 {
74 ((DEREncodable)obj).getDERObject().encode(this);
75 }
76 else
77 {
78 throw new IOException("object not DEREncodable");
79 }
80 }
81 }
82 |
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