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using System;
using System.IO;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1
{
public class DerEnumerated
: Asn1Object
{
internal class Meta : Asn1UniversalType
{
internal static readonly Asn1UniversalType Instance = new Meta();
private Meta() : base(typeof(DerEnumerated), Asn1Tags.Enumerated) {}
internal override Asn1Object FromImplicitPrimitive(DerOctetString octetString)
{
return CreatePrimitive(octetString.GetOctets(), false);
}
}
/**
* 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)
return null;
if (obj is DerEnumerated derEnumerated)
return derEnumerated;
if (obj is IAsn1Convertible asn1Convertible)
{
if (!(obj is Asn1Object) && asn1Convertible.ToAsn1Object() is DerEnumerated converted)
return converted;
}
else if (obj is byte[] bytes)
{
try
{
return (DerEnumerated)Meta.Instance.FromByteArray(bytes);
}
catch (IOException e)
{
throw new ArgumentException("failed to construct enumerated from byte[]: " + e.Message);
}
}
throw new ArgumentException("illegal object in GetInstance: " + Platform.GetTypeName(obj));
}
/**
* return an Enumerated from a tagged object.
*
* @param taggedObject the tagged object holding the object we want
* @param declaredExplicit 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 taggedObject, bool declaredExplicit)
{
return (DerEnumerated)Meta.Instance.GetContextInstance(taggedObject, declaredExplicit);
}
public static DerEnumerated GetOptional(Asn1Encodable element)
{
if (element == null)
throw new ArgumentNullException(nameof(element));
if (element is DerEnumerated existing)
return existing;
return null;
}
public static DerEnumerated GetTagged(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return (DerEnumerated)Meta.Instance.GetTagged(taggedObject, declaredExplicit);
}
private readonly byte[] contents;
private readonly int start;
public DerEnumerated(int val)
{
if (val < 0)
throw new ArgumentException("enumerated must be non-negative", "val");
this.contents = BigInteger.ValueOf(val).ToByteArray();
this.start = 0;
}
public DerEnumerated(long val)
{
if (val < 0L)
throw new ArgumentException("enumerated must be non-negative", "val");
this.contents = 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.contents = val.ToByteArray();
this.start = 0;
}
public DerEnumerated(byte[] contents)
: this(contents, true)
{
}
internal DerEnumerated(byte[] contents, bool clone)
{
if (DerInteger.IsMalformed(contents))
throw new ArgumentException("malformed enumerated", "contents");
if (0 != (contents[0] & 0x80))
throw new ArgumentException("enumerated must be non-negative", "contents");
this.contents = clone ? Arrays.Clone(contents) : contents;
this.start = DerInteger.SignBytesToSkip(this.contents);
}
public BigInteger Value
{
get { return new BigInteger(contents); }
}
public bool HasValue(int x)
{
return (contents.Length - start) <= 4
&& DerInteger.IntValue(contents, start, DerInteger.SignExtSigned) == x;
}
public bool HasValue(BigInteger x)
{
return null != x
// Fast check to avoid allocation
&& DerInteger.IntValue(contents, start, DerInteger.SignExtSigned) == x.IntValue
&& Value.Equals(x);
}
public int IntValueExact
{
get
{
int count = contents.Length - start;
if (count > 4)
throw new ArithmeticException("ASN.1 Enumerated out of int range");
return DerInteger.IntValue(contents, start, DerInteger.SignExtSigned);
}
}
internal override IAsn1Encoding GetEncoding(int encoding)
{
return new PrimitiveEncoding(Asn1Tags.Universal, Asn1Tags.Enumerated, contents);
}
internal override IAsn1Encoding GetEncodingImplicit(int encoding, int tagClass, int tagNo)
{
return new PrimitiveEncoding(tagClass, tagNo, contents);
}
internal sealed override DerEncoding GetEncodingDer()
{
return new PrimitiveDerEncoding(Asn1Tags.Universal, Asn1Tags.Enumerated, contents);
}
internal sealed override DerEncoding GetEncodingDerImplicit(int tagClass, int tagNo)
{
return new PrimitiveDerEncoding(tagClass, tagNo, contents);
}
protected override bool Asn1Equals(Asn1Object asn1Object)
{
DerEnumerated other = asn1Object as DerEnumerated;
if (other == null)
return false;
return Arrays.AreEqual(this.contents, other.contents);
}
protected override int Asn1GetHashCode()
{
return Arrays.GetHashCode(contents);
}
private static readonly DerEnumerated[] cache = new DerEnumerated[12];
internal static DerEnumerated CreatePrimitive(byte[] contents, bool clone)
{
if (contents.Length > 1)
return new DerEnumerated(contents, clone);
if (contents.Length == 0)
throw new ArgumentException("ENUMERATED has zero length", "contents");
int value = contents[0];
if (value >= cache.Length)
return new DerEnumerated(contents, clone);
DerEnumerated possibleMatch = cache[value];
if (possibleMatch == null)
{
cache[value] = possibleMatch = new DerEnumerated(contents, clone);
}
return possibleMatch;
}
}
}
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