using System; using System.Collections; using System.Collections.Generic; namespace Org.BouncyCastle.Asn1 { public class Asn1EncodableVector : IEnumerable<Asn1Encodable>, IEnumerable { internal static readonly Asn1Encodable[] EmptyElements = new Asn1Encodable[0]; private const int DefaultCapacity = 10; private Asn1Encodable[] elements; private int elementCount; private bool copyOnWrite; public Asn1Encodable this[int index] { get { if (index >= elementCount) throw new IndexOutOfRangeException(index.ToString() + " >= " + elementCount.ToString()); return elements[index]; } } public int Count => elementCount; public static Asn1EncodableVector FromEnumerable(IEnumerable<Asn1Encodable> e) { Asn1EncodableVector asn1EncodableVector = new Asn1EncodableVector(); foreach (Asn1Encodable item in e) { asn1EncodableVector.Add(item); } return asn1EncodableVector; } public Asn1EncodableVector() : this(10) { } public Asn1EncodableVector(int initialCapacity) { if (initialCapacity < 0) throw new ArgumentException("must not be negative", "initialCapacity"); elements = ((initialCapacity == 0) ? EmptyElements : new Asn1Encodable[initialCapacity]); elementCount = 0; copyOnWrite = false; } public Asn1EncodableVector(Asn1Encodable element) : this() { Add(element); } public Asn1EncodableVector(Asn1Encodable element1, Asn1Encodable element2) : this() { Add(element1); Add(element2); } public Asn1EncodableVector(params Asn1Encodable[] v) : this() { Add(v); } public void Add(Asn1Encodable element) { if (element == null) throw new ArgumentNullException("element"); int num = elements.Length; int num2 = elementCount + 1; if ((num2 > num) | copyOnWrite) Reallocate(num2); elements[elementCount] = element; elementCount = num2; } public void Add(Asn1Encodable element1, Asn1Encodable element2) { Add(element1); Add(element2); } public void Add(params Asn1Encodable[] objs) { foreach (Asn1Encodable element in objs) { Add(element); } } public void AddOptional(Asn1Encodable element) { if (element != null) Add(element); } public void AddOptional(Asn1Encodable element1, Asn1Encodable element2) { if (element1 != null) Add(element1); if (element2 != null) Add(element2); } public void AddOptional(params Asn1Encodable[] elements) { if (elements != null) { foreach (Asn1Encodable asn1Encodable in elements) { if (asn1Encodable != null) Add(asn1Encodable); } } } public void AddOptionalTagged(bool isExplicit, int tagNo, Asn1Encodable obj) { if (obj != null) Add(new DerTaggedObject(isExplicit, tagNo, obj)); } public void AddOptionalTagged(bool isExplicit, int tagClass, int tagNo, Asn1Encodable obj) { if (obj != null) Add(new DerTaggedObject(isExplicit, tagClass, tagNo, obj)); } public void AddAll(Asn1EncodableVector other) { if (other == null) throw new ArgumentNullException("other"); int count = other.Count; if (count >= 1) { int num = elements.Length; int num2 = elementCount + count; if ((num2 > num) | copyOnWrite) Reallocate(num2); int num3 = 0; do { Asn1Encodable asn1Encodable = other[num3]; if (asn1Encodable == null) throw new NullReferenceException("'other' elements cannot be null"); elements[elementCount + num3] = asn1Encodable; } while (++num3 < count); elementCount = num2; } } IEnumerator IEnumerable.GetEnumerator() { return GetEnumerator(); } public IEnumerator<Asn1Encodable> GetEnumerator() { return ((IEnumerable<Asn1Encodable>)CopyElements()).GetEnumerator(); } internal Asn1Encodable[] CopyElements() { if (elementCount == 0) return EmptyElements; Asn1Encodable[] array = new Asn1Encodable[elementCount]; Array.Copy(elements, 0, array, 0, elementCount); return array; } internal Asn1Encodable[] TakeElements() { if (elementCount == 0) return EmptyElements; if (elements.Length == elementCount) { copyOnWrite = true; return elements; } Asn1Encodable[] array = new Asn1Encodable[elementCount]; Array.Copy(elements, 0, array, 0, elementCount); return array; } private void Reallocate(int minCapacity) { Asn1Encodable[] destinationArray = new Asn1Encodable[System.Math.Max(elements.Length, minCapacity + (minCapacity >> 1))]; Array.Copy(elements, 0, destinationArray, 0, elementCount); elements = destinationArray; copyOnWrite = false; } internal static Asn1Encodable[] CloneElements(Asn1Encodable[] elements) { if (elements.Length >= 1) return (Asn1Encodable[])elements.Clone(); return EmptyElements; } } }