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using System;
using System.IO;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1
{
public class DerBoolean
: Asn1Object
{
internal class Meta : Asn1UniversalType
{
internal static readonly Asn1UniversalType Instance = new Meta();
private Meta() : base(typeof(DerBoolean), Asn1Tags.Boolean) {}
internal override Asn1Object FromImplicitPrimitive(DerOctetString octetString)
{
return CreatePrimitive(octetString.GetOctets());
}
}
public static readonly DerBoolean False = new DerBoolean(false);
public static readonly DerBoolean True = new DerBoolean(true);
/**
* return a bool from the passed in object.
*
* @exception ArgumentException if the object cannot be converted.
*/
public static DerBoolean GetInstance(object obj)
{
if (obj == null || obj is DerBoolean)
{
return (DerBoolean)obj;
}
else if (obj is IAsn1Convertible)
{
Asn1Object asn1Object = ((IAsn1Convertible)obj).ToAsn1Object();
if (asn1Object is DerBoolean)
return (DerBoolean)asn1Object;
}
else if (obj is byte[])
{
try
{
return (DerBoolean)Meta.Instance.FromByteArray((byte[])obj);
}
catch (IOException e)
{
throw new ArgumentException("failed to construct boolean from byte[]: " + e.Message);
}
}
throw new ArgumentException("illegal object in GetInstance: " + Platform.GetTypeName(obj));
}
public static DerBoolean GetInstance(bool value)
{
return value ? True : False;
}
public static DerBoolean GetInstance(int value)
{
return value != 0 ? True : False;
}
/**
* return a Boolean 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 DerBoolean GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return (DerBoolean)Meta.Instance.GetContextInstance(taggedObject, declaredExplicit);
}
private readonly byte value;
public DerBoolean(
byte[] val)
{
if (val.Length != 1)
throw new ArgumentException("byte value should have 1 byte in it", "val");
// TODO Are there any constraints on the possible byte values?
this.value = val[0];
}
private DerBoolean(
bool value)
{
this.value = value ? (byte)0xff : (byte)0;
}
public bool IsTrue
{
get { return value != 0; }
}
internal override IAsn1Encoding GetEncoding(int encoding)
{
return new PrimitiveEncoding(Asn1Tags.Universal, Asn1Tags.Boolean, GetContents(encoding));
}
internal override IAsn1Encoding GetEncodingImplicit(int encoding, int tagClass, int tagNo)
{
return new PrimitiveEncoding(tagClass, tagNo, GetContents(encoding));
}
protected override bool Asn1Equals(
Asn1Object asn1Object)
{
DerBoolean other = asn1Object as DerBoolean;
if (other == null)
return false;
return IsTrue == other.IsTrue;
}
protected override int Asn1GetHashCode()
{
return IsTrue.GetHashCode();
}
public override string ToString()
{
return IsTrue ? "TRUE" : "FALSE";
}
internal static DerBoolean CreatePrimitive(byte[] contents)
{
if (contents.Length != 1)
throw new ArgumentException("BOOLEAN value should have 1 byte in it", "contents");
byte b = contents[0];
return b == 0 ? False : b == 0xFF ? True : new DerBoolean(contents);
}
private byte[] GetContents(int encoding)
{
byte contents = value;
if (Asn1OutputStream.EncodingDer == encoding && IsTrue)
{
contents = 0xFF;
}
return new byte[]{ contents };
}
}
}
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