| package org.bouncycastle.asn1; |
| |
| import java.io.IOException; |
| import java.math.BigInteger; |
| |
| import org.bouncycastle.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; |
| } |
| } |