OidCollection.cs

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using System.Collections;
using Internal.Cryptography;
 
namespace System.Security.Cryptography;
 
public sealed class OidCollection : ICollection, IEnumerable
{
    private Oid[] _oids = Array.Empty<Oid>();
 
    private int _count;
 
    public Oid this[int index]
    {
        get
        {
            if ((uint)index >= (uint)_count)
            {
                throw new ArgumentOutOfRangeException("index");
            }
            return _oids[index];
        }
    }
 
    public Oid? this[string oid]
    {
        get
        {
            string text = OidLookup.ToOid(oid, OidGroup.All, fallBackToAllGroups: false);
            if (text == null)
            {
                text = oid;
            }
            for (int i = 0; i < _count; i++)
            {
                Oid oid2 = _oids[i];
                if (oid2.Value == text)
                {
                    return oid2;
                }
            }
            return null;
        }
    }
 
    public int Count => _count;
 
    public bool IsSynchronized => false;
 
    public object SyncRoot => this;
 
    public int Add(Oid oid)
    {
        int count = _count;
        if (count == _oids.Length)
        {
            Array.Resize(ref _oids, (count == 0) ? 4 : (count * 2));
        }
        _oids[count] = oid;
        _count = count + 1;
        return count;
    }
 
    public OidEnumerator GetEnumerator()
    {
        return new OidEnumerator(this);
    }
 
    IEnumerator IEnumerable.GetEnumerator()
    {
        return GetEnumerator();
    }
 
    void ICollection.CopyTo(Array array, int index)
    {
        if (array == null)
        {
            throw new ArgumentNullException("array");
        }
        if (array.Rank != 1)
        {
            throw new ArgumentException(System.SR.Arg_RankMultiDimNotSupported);
        }
        if (index < 0 || index >= array.Length)
        {
            throw new ArgumentOutOfRangeException("index", System.SR.ArgumentOutOfRange_Index);
        }
        if (index + Count > array.Length)
        {
            throw new ArgumentException(System.SR.Argument_InvalidOffLen);
        }
        for (int i = 0; i < Count; i++)
        {
            array.SetValue(this[i], index);
            index++;
        }
    }
 
    public void CopyTo(Oid[] array, int index)
    {
        if (array == null)
        {
            throw new ArgumentNullException("array");
        }
        if (index < 0 || index >= array.Length)
        {
            throw new ArgumentOutOfRangeException("index", System.SR.ArgumentOutOfRange_Index);
        }
        Array.Copy(_oids, 0, array, index, _count);
    }
}