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/* see bouncycastle_license.txt */
package com.lowagie.bc.asn1;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
public class DERObjectIdentifier
extends DERObject
{
String identifier;
/**
* return an OID from the passed in object
*
* @exception IllegalArgumentException if the object cannot be converted.
*/
public static DERObjectIdentifier getInstance(
Object obj)
{
if (obj == null || obj instanceof DERObjectIdentifier)
{
return (DERObjectIdentifier)obj;
}
if (obj instanceof ASN1OctetString)
{
return new DERObjectIdentifier(((ASN1OctetString)obj).getOctets());
}
if (obj instanceof ASN1TaggedObject)
{
return getInstance(((ASN1TaggedObject)obj).getObject());
}
throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName());
}
/**
* return an Object Identifier from a tagged object.
*
* @param obj the tagged object holding the object we want
* @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 DERObjectIdentifier getInstance(
ASN1TaggedObject obj,
boolean explicit)
{
return getInstance(obj.getObject());
}
DERObjectIdentifier(
byte[] bytes)
{
StringBuffer objId = new StringBuffer();
int value = 0;
boolean first = true;
for (int i = 0; i != bytes.length; i++)
{
int b = bytes[i] & 0xff;
value = value * 128 + (b & 0x7f);
if ((b & 0x80) == 0) // end of number reached
{
if (first)
{
switch (value / 40)
{
case 0:
objId.append('0');
break;
case 1:
objId.append('1');
value -= 40;
break;
default:
objId.append('2');
value -= 80;
}
first = false;
}
objId.append('.');
objId.append(Integer.toString(value));
value = 0;
}
}
this.identifier = objId.toString();
}
public DERObjectIdentifier(
String identifier)
{
this.identifier = identifier;
}
public String getId()
{
return identifier;
}
private void writeField(
OutputStream out,
int fieldValue)
throws IOException
{
if (fieldValue >= (1 << 7))
{
if (fieldValue >= (1 << 14))
{
if (fieldValue >= (1 << 21))
{
if (fieldValue >= (1 << 28))
{
out.write((fieldValue >> 28) | 0x80);
}
out.write((fieldValue >> 21) | 0x80);
}
out.write((fieldValue >> 14) | 0x80);
}
out.write((fieldValue >> 7) | 0x80);
}
out.write(fieldValue & 0x7f);
}
void encode(
DEROutputStream out)
throws IOException
{
OIDTokenizer tok = new OIDTokenizer(identifier);
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
DEROutputStream dOut = new DEROutputStream(bOut);
writeField(bOut,
Integer.parseInt(tok.nextToken()) * 40
+ Integer.parseInt(tok.nextToken()));
while (tok.hasMoreTokens())
{
writeField(bOut, Integer.parseInt(tok.nextToken()));
}
dOut.close();
byte[] bytes = bOut.toByteArray();
out.writeEncoded(OBJECT_IDENTIFIER, bytes);
}
public int hashCode()
{
return identifier.hashCode();
}
public boolean equals(
Object o)
{
if ((o == null) || !(o instanceof DERObjectIdentifier))
{
return false;
}
return identifier.equals(((DERObjectIdentifier)o).identifier);
}
}
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