kopia lustrzana https://github.com/dl2alf/AirScout
266 wiersze
8.4 KiB
C#
266 wiersze
8.4 KiB
C#
using System;
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using System.Collections;
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using System.IO;
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using Org.BouncyCastle.Utilities;
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using Org.BouncyCastle.Utilities.Collections;
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namespace Org.BouncyCastle.Asn1
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{
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public abstract class Asn1Sequence
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: Asn1Object, IEnumerable
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{
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internal class Meta : Asn1UniversalType
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{
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internal static readonly Asn1UniversalType Instance = new Meta();
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private Meta() : base(typeof(Asn1Sequence), Asn1Tags.Sequence) {}
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internal override Asn1Object FromImplicitConstructed(Asn1Sequence sequence)
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{
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return sequence;
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}
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}
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/**
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* return an Asn1Sequence from the given object.
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*
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* @param obj the object we want converted.
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* @exception ArgumentException if the object cannot be converted.
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*/
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public static Asn1Sequence GetInstance(object obj)
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{
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if (obj == null || obj is Asn1Sequence)
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{
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return (Asn1Sequence)obj;
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}
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//else if (obj is Asn1SequenceParser)
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else if (obj is IAsn1Convertible)
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{
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Asn1Object asn1Object = ((IAsn1Convertible)obj).ToAsn1Object();
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if (asn1Object is Asn1Sequence)
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return (Asn1Sequence)asn1Object;
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}
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else if (obj is byte[])
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{
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try
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{
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return (Asn1Sequence)Meta.Instance.FromByteArray((byte[])obj);
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}
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catch (IOException e)
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{
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throw new ArgumentException("failed to construct sequence from byte[]: " + e.Message);
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}
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}
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throw new ArgumentException("illegal object in GetInstance: " + Platform.GetTypeName(obj), "obj");
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}
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/**
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* Return an ASN1 sequence from a tagged object. There is a special
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* case here, if an object appears to have been explicitly tagged on
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* reading but we were expecting it to be implicitly tagged in the
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* normal course of events it indicates that we lost the surrounding
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* sequence - so we need to add it back (this will happen if the tagged
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* object is a sequence that contains other sequences). If you are
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* dealing with implicitly tagged sequences you really <b>should</b>
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* be using this method.
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*
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* @param taggedObject the tagged object.
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* @param declaredExplicit true if the object is meant to be explicitly tagged, false otherwise.
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* @exception ArgumentException if the tagged object cannot be converted.
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*/
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public static Asn1Sequence GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
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{
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return (Asn1Sequence)Meta.Instance.GetContextInstance(taggedObject, declaredExplicit);
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}
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// NOTE: Only non-readonly to support LazyDLSequence
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internal Asn1Encodable[] elements;
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protected internal Asn1Sequence()
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{
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this.elements = Asn1EncodableVector.EmptyElements;
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}
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protected internal Asn1Sequence(Asn1Encodable element)
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{
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if (null == element)
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throw new ArgumentNullException("element");
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this.elements = new Asn1Encodable[]{ element };
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}
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protected internal Asn1Sequence(params Asn1Encodable[] elements)
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{
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if (Arrays.IsNullOrContainsNull(elements))
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throw new NullReferenceException("'elements' cannot be null, or contain null");
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this.elements = Asn1EncodableVector.CloneElements(elements);
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}
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internal Asn1Sequence(Asn1Encodable[] elements, bool clone)
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{
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this.elements = clone ? Asn1EncodableVector.CloneElements(elements) : elements;
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}
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protected internal Asn1Sequence(Asn1EncodableVector elementVector)
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{
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if (null == elementVector)
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throw new ArgumentNullException("elementVector");
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this.elements = elementVector.TakeElements();
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}
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public virtual IEnumerator GetEnumerator()
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{
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return elements.GetEnumerator();
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}
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private class Asn1SequenceParserImpl
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: Asn1SequenceParser
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{
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private readonly Asn1Sequence outer;
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private readonly int max;
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private int index;
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public Asn1SequenceParserImpl(
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Asn1Sequence outer)
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{
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this.outer = outer;
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// NOTE: Call Count here to 'force' a LazyDerSequence
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this.max = outer.Count;
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}
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public IAsn1Convertible ReadObject()
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{
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if (index == max)
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return null;
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Asn1Encodable obj = outer[index++];
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if (obj is Asn1Sequence)
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return ((Asn1Sequence)obj).Parser;
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if (obj is Asn1Set)
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return ((Asn1Set)obj).Parser;
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// NB: Asn1OctetString implements Asn1OctetStringParser directly
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// if (obj is Asn1OctetString)
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// return ((Asn1OctetString)obj).Parser;
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return obj;
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}
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public Asn1Object ToAsn1Object()
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{
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return outer;
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}
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}
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public virtual Asn1SequenceParser Parser
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{
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get { return new Asn1SequenceParserImpl(this); }
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}
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/**
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* return the object at the sequence position indicated by index.
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*
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* @param index the sequence number (starting at zero) of the object
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* @return the object at the sequence position indicated by index.
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*/
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public virtual Asn1Encodable this[int index]
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{
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get { return elements[index]; }
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}
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public virtual int Count
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{
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get { return elements.Length; }
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}
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public virtual Asn1Encodable[] ToArray()
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{
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return Asn1EncodableVector.CloneElements(elements);
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}
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protected override int Asn1GetHashCode()
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{
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// NOTE: Call Count here to 'force' a LazyDerSequence
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int i = Count;
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int hc = i + 1;
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while (--i >= 0)
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{
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hc *= 257;
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hc ^= elements[i].ToAsn1Object().CallAsn1GetHashCode();
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}
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return hc;
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}
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protected override bool Asn1Equals(Asn1Object asn1Object)
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{
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Asn1Sequence that = asn1Object as Asn1Sequence;
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if (null == that)
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return false;
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// NOTE: Call Count here (on both) to 'force' a LazyDerSequence
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int count = this.Count;
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if (that.Count != count)
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return false;
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for (int i = 0; i < count; ++i)
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{
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Asn1Object o1 = this.elements[i].ToAsn1Object();
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Asn1Object o2 = that.elements[i].ToAsn1Object();
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if (!o1.Equals(o2))
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return false;
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}
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return true;
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}
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public override string ToString()
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{
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return CollectionUtilities.ToString(elements);
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}
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// TODO[asn1] Preferably return an Asn1BitString[] (doesn't exist yet)
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internal DerBitString[] GetConstructedBitStrings()
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{
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// NOTE: Call Count here to 'force' a LazyDerSequence
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int count = Count;
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DerBitString[] bitStrings = new DerBitString[count];
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for (int i = 0; i < count; ++i)
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{
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bitStrings[i] = DerBitString.GetInstance(elements[i]);
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}
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return bitStrings;
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}
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internal Asn1OctetString[] GetConstructedOctetStrings()
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{
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// NOTE: Call Count here to 'force' a LazyDerSequence
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int count = Count;
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Asn1OctetString[] octetStrings = new Asn1OctetString[count];
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for (int i = 0; i < count; ++i)
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{
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octetStrings[i] = Asn1OctetString.GetInstance(elements[i]);
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}
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return octetStrings;
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}
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// TODO[asn1] Preferably return an Asn1BitString (doesn't exist yet)
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internal abstract DerBitString ToAsn1BitString();
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// TODO[asn1] Preferably return an Asn1External (doesn't exist yet)
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internal abstract DerExternal ToAsn1External();
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internal abstract Asn1OctetString ToAsn1OctetString();
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internal abstract Asn1Set ToAsn1Set();
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}
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}
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