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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;
private readonly int start;
/**
* 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)
{
if (val < 0)
throw new ArgumentException("enumerated must be non-negative", "val");
this.bytes = BigInteger.ValueOf(val).ToByteArray();
this.start = 0;
}
public DerEnumerated(long val)
{
if (val < 0L)
throw new ArgumentException("enumerated must be non-negative", "val");
this.bytes = BigInteger.ValueOf(val).ToByteArray();
this.start = 0;
}
public DerEnumerated(BigInteger val)
{
if (val.SignValue < 0)
throw new ArgumentException("enumerated must be non-negative", "val");
this.bytes = val.ToByteArray();
this.start = 0;
}
public DerEnumerated(byte[] bytes)
{
if (DerInteger.IsMalformed(bytes))
throw new ArgumentException("malformed enumerated", "bytes");
if (0 != (bytes[0] & 0x80))
throw new ArgumentException("enumerated must be non-negative", "bytes");
this.bytes = Arrays.Clone(bytes);
this.start = DerInteger.SignBytesToSkip(bytes);
}
public BigInteger Value
{
get { return new BigInteger(bytes); }
}
public bool HasValue(BigInteger x)
{
return null != x
// Fast check to avoid allocation
&& DerInteger.IntValue(bytes, start, DerInteger.SignExtSigned) == x.IntValue
&& Value.Equals(x);
}
public int IntValueExact
{
get
{
int count = bytes.Length - start;
if (count > 4)
throw new ArithmeticException("ASN.1 Enumerated out of int range");
return DerInteger.IntValue(bytes, start, DerInteger.SignExtSigned);
}
}
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 > 1)
return new DerEnumerated(enc);
if (enc.Length == 0)
throw new ArgumentException("ENUMERATED has zero length", "enc");
int value = enc[0];
if (value >= cache.Length)
return new DerEnumerated(enc);
DerEnumerated possibleMatch = cache[value];
if (possibleMatch == null)
{
cache[value] = possibleMatch = new DerEnumerated(enc);
}
return possibleMatch;
}
}
}
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