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using System;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1
{
public class DerEnumerated
: Asn1Object
{
private readonly byte[] bytes;
/**
* return an integer from the passed in object
*
* @exception ArgumentException if the object cannot be converted.
*/
public static DerEnumerated GetInstance(
object obj)
{
if (obj == null || obj is DerEnumerated)
{
return (DerEnumerated)obj;
}
throw new ArgumentException("illegal object in GetInstance: " + Platform.GetTypeName(obj));
}
/**
* return an Enumerated from a tagged object.
*
* @param obj the tagged object holding the object we want
* @param explicitly true if the object is meant to be explicitly
* tagged false otherwise.
* @exception ArgumentException if the tagged object cannot
* be converted.
*/
public static DerEnumerated GetInstance(
Asn1TaggedObject obj,
bool isExplicit)
{
Asn1Object o = obj.GetObject();
if (isExplicit || o is DerEnumerated)
{
return GetInstance(o);
}
return FromOctetString(((Asn1OctetString)o).GetOctets());
}
public DerEnumerated(
int val)
{
bytes = BigInteger.ValueOf(val).ToByteArray();
}
public DerEnumerated(
BigInteger val)
{
bytes = val.ToByteArray();
}
public DerEnumerated(
byte[] bytes)
{
if (bytes.Length > 1)
{
if ((bytes[0] == 0 && (bytes[1] & 0x80) == 0)
|| (bytes[0] == (byte)0xff && (bytes[1] & 0x80) != 0))
{
if (!DerInteger.AllowUnsafe())
throw new ArgumentException("malformed enumerated");
}
}
this.bytes = Arrays.Clone(bytes);
}
public BigInteger Value
{
get { return new BigInteger(bytes); }
}
internal override void Encode(
DerOutputStream derOut)
{
derOut.WriteEncoded(Asn1Tags.Enumerated, bytes);
}
protected override bool Asn1Equals(
Asn1Object asn1Object)
{
DerEnumerated other = asn1Object as DerEnumerated;
if (other == null)
return false;
return Arrays.AreEqual(this.bytes, other.bytes);
}
protected override int Asn1GetHashCode()
{
return Arrays.GetHashCode(bytes);
}
private static readonly DerEnumerated[] cache = new DerEnumerated[12];
internal static DerEnumerated FromOctetString(byte[] enc)
{
if (enc.Length == 0)
{
throw new ArgumentException("ENUMERATED has zero length", "enc");
}
if (enc.Length == 1)
{
int value = enc[0];
if (value < cache.Length)
{
DerEnumerated cached = cache[value];
if (cached != null)
{
return cached;
}
return cache[value] = new DerEnumerated(Arrays.Clone(enc));
}
}
return new DerEnumerated(Arrays.Clone(enc));
}
}
}
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