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using System;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1
{
public class DerBoolean
: Asn1Object
{
private readonly byte value;
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;
}
throw new ArgumentException("illegal object in GetInstance: " + Platform.GetTypeName(obj));
}
/**
* return a DerBoolean from the passed in bool.
*/
public static DerBoolean GetInstance(
bool value)
{
return value ? True : False;
}
/**
* return a Boolean 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 DerBoolean GetInstance(
Asn1TaggedObject obj,
bool isExplicit)
{
Asn1Object o = obj.GetObject();
if (isExplicit || o is DerBoolean)
{
return GetInstance(o);
}
return FromOctetString(((Asn1OctetString)o).GetOctets());
}
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 bool EncodeConstructed(int encoding)
{
return false;
}
internal override int EncodedLength(int encoding, bool withID)
{
return Asn1OutputStream.GetLengthOfEncodingDL(withID, 1);
}
internal override void Encode(Asn1OutputStream asn1Out, bool withID)
{
byte contents = value;
if (Asn1OutputStream.EncodingDer == asn1Out.Encoding && IsTrue)
{
contents = 0xFF;
}
asn1Out.WriteEncodingDL(withID, Asn1Tags.Boolean, contents);
}
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 FromOctetString(byte[] value)
{
if (value.Length != 1)
{
throw new ArgumentException("BOOLEAN value should have 1 byte in it", "value");
}
byte b = value[0];
return b == 0 ? False : b == 0xFF ? True : new DerBoolean(value);
}
}
}
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