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package org.spongycastle.asn1;
import java.io.IOException;
import java.math.BigInteger;
import org.spongycastle.util.Arrays;
/**
* Class representing the ASN.1 ENUMERATED type.
*/
public class ASN1Enumerated
extends ASN1Primitive
{
byte[] bytes;
/**
* return an enumerated from the passed in object
*
* @param obj an ASN1Enumerated or an object that can be converted into one.
* @exception IllegalArgumentException if the object cannot be converted.
* @return an ASN1Enumerated instance, or null.
*/
public static ASN1Enumerated getInstance(
Object obj)
{
if (obj == null || obj instanceof ASN1Enumerated)
{
return (ASN1Enumerated)obj;
}
if (obj instanceof byte[])
{
try
{
return (ASN1Enumerated)fromByteArray((byte[])obj);
}
catch (Exception e)
{
throw new IllegalArgumentException("encoding error in getInstance: " + e.toString());
}
}
throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName());
}
/**
* return an Enumerated 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.
* @return an ASN1Enumerated instance, or null.
*/
public static ASN1Enumerated getInstance(
ASN1TaggedObject obj,
boolean explicit)
{
ASN1Primitive o = obj.getObject();
if (explicit || o instanceof ASN1Enumerated)
{
return getInstance(o);
}
else
{
return fromOctetString(((ASN1OctetString)o).getOctets());
}
}
/**
* Constructor from int.
*
* @param value the value of this enumerated.
*/
public ASN1Enumerated(
int value)
{
bytes = BigInteger.valueOf(value).toByteArray();
}
/**
* Constructor from BigInteger
*
* @param value the value of this enumerated.
*/
public ASN1Enumerated(
BigInteger value)
{
bytes = value.toByteArray();
}
/**
* Constructor from encoded BigInteger.
*
* @param bytes the value of this enumerated as an encoded BigInteger (signed).
*/
public ASN1Enumerated(
byte[] bytes)
{
this.bytes = bytes;
}
public BigInteger getValue()
{
return new BigInteger(bytes);
}
boolean isConstructed()
{
return false;
}
int encodedLength()
{
return 1 + StreamUtil.calculateBodyLength(bytes.length) + bytes.length;
}
void encode(
ASN1OutputStream out)
throws IOException
{
out.writeEncoded(BERTags.ENUMERATED, bytes);
}
boolean asn1Equals(
ASN1Primitive o)
{
if (!(o instanceof ASN1Enumerated))
{
return false;
}
ASN1Enumerated other = (ASN1Enumerated)o;
return Arrays.areEqual(this.bytes, other.bytes);
}
public int hashCode()
{
return Arrays.hashCode(bytes);
}
private static ASN1Enumerated[] cache = new ASN1Enumerated[12];
static ASN1Enumerated fromOctetString(byte[] enc)
{
if (enc.length > 1)
{
return new ASN1Enumerated(Arrays.clone(enc));
}
if (enc.length == 0)
{
throw new IllegalArgumentException("ENUMERATED has zero length");
}
int value = enc[0] & 0xff;
if (value >= cache.length)
{
return new ASN1Enumerated(Arrays.clone(enc));
}
ASN1Enumerated possibleMatch = cache[value];
if (possibleMatch == null)
{
possibleMatch = cache[value] = new ASN1Enumerated(Arrays.clone(enc));
}
return possibleMatch;
}
}
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