1 package org.bouncycastle.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
