111 lines
2.7 KiB
C#
111 lines
2.7 KiB
C#
using System;
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namespace Org.BouncyCastle.Asn1
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{
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public class DerBoolean
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: Asn1Object
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{
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private readonly byte value;
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public static readonly DerBoolean False = new DerBoolean(false);
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public static readonly DerBoolean True = new DerBoolean(true);
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/**
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* return a bool from the passed in object.
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*
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* @exception ArgumentException if the object cannot be converted.
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*/
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public static DerBoolean GetInstance(
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object obj)
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{
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if (obj == null || obj is DerBoolean)
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{
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return (DerBoolean) obj;
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}
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if (obj is Asn1OctetString)
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{
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return new DerBoolean(((Asn1OctetString) obj).GetOctets());
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}
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if (obj is Asn1TaggedObject)
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{
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return GetInstance(((Asn1TaggedObject) obj).GetObject());
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}
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throw new ArgumentException("illegal object in GetInstance: " + obj.GetType().Name);
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}
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/**
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* return a DerBoolean from the passed in bool.
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*/
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public static DerBoolean GetInstance(
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bool value)
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{
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return value ? True : False;
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}
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/**
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* return a Boolean from a tagged object.
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*
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* @param obj the tagged object holding the object we want
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* @param explicitly true if the object is meant to be explicitly
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* tagged false otherwise.
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* @exception ArgumentException if the tagged object cannot
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* be converted.
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*/
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public static DerBoolean GetInstance(
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Asn1TaggedObject obj,
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bool explicitly)
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{
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return GetInstance(obj.GetObject());
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}
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public DerBoolean(
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byte[] value)
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{
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// TODO Are there any constraints on the possible byte values?
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this.value = value[0];
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}
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private DerBoolean(
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bool value)
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{
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this.value = value ? (byte)0xff : (byte)0;
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}
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public bool IsTrue
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{
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get { return value != 0; }
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}
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internal override void Encode(
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DerOutputStream derOut)
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{
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// TODO Should we make sure the byte value is one of '0' or '0xff' here?
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derOut.WriteEncoded(Asn1Tags.Boolean, new byte[]{ value });
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}
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protected override bool Asn1Equals(
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Asn1Object asn1Object)
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{
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DerBoolean other = asn1Object as DerBoolean;
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if (other == null)
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return false;
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return IsTrue == other.IsTrue;
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}
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protected override int Asn1GetHashCode()
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{
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return IsTrue.GetHashCode();
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}
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public override string ToString()
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{
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return IsTrue ? "TRUE" : "FALSE";
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}
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}
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}
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