LongList.cs

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namespace System.Runtime.Serialization;
 
internal sealed class LongList
{
    private long[] _values;
 
    private int _count;
 
    private int _totalItems;
 
    private int _currentItem;
 
    internal int Count => _count;
 
    internal long Current => _values[_currentItem];
 
    internal LongList()
        : this(2)
    {
    }
 
    internal LongList(int startingSize)
    {
        _count = 0;
        _totalItems = 0;
        _values = new long[startingSize];
    }
 
    internal void Add(long value)
    {
        if (_totalItems == _values.Length)
        {
            EnlargeArray();
        }
        _values[_totalItems++] = value;
        _count++;
    }
 
    internal void StartEnumeration()
    {
        _currentItem = -1;
    }
 
    internal bool MoveNext()
    {
        while (++_currentItem < _totalItems && _values[_currentItem] == -1)
        {
        }
        return _currentItem != _totalItems;
    }
 
    internal bool RemoveElement(long value)
    {
        int i;
        for (i = 0; i < _totalItems && _values[i] != value; i++)
        {
        }
        if (i == _totalItems)
        {
            return false;
        }
        _values[i] = -1L;
        return true;
    }
 
    private void EnlargeArray()
    {
        int num = _values.Length * 2;
        if (num < 0)
        {
            num = int.MaxValue;
        }
        long[] array = new long[num];
        Array.Copy(_values, array, _count);
        _values = array;
    }
}