SerStack.cs

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namespace System.Runtime.Serialization.Formatters.Binary;
 
internal sealed class SerStack
{
    internal object[] _objects = new object[5];
 
    internal string _stackId;
 
    internal int _top = -1;
 
    internal SerStack(string stackId)
    {
        _stackId = stackId;
    }
 
    internal void Push(object obj)
    {
        if (_top == _objects.Length - 1)
        {
            IncreaseCapacity();
        }
        _objects[++_top] = obj;
    }
 
    internal object Pop()
    {
        if (_top < 0)
        {
            return null;
        }
        object result = _objects[_top];
        _objects[_top--] = null;
        return result;
    }
 
    internal void IncreaseCapacity()
    {
        int num = _objects.Length * 2;
        object[] array = new object[num];
        Array.Copy(_objects, array, _objects.Length);
        _objects = array;
    }
 
    internal object Peek()
    {
        if (_top >= 0)
        {
            return _objects[_top];
        }
        return null;
    }
 
    internal object PeekPeek()
    {
        if (_top >= 1)
        {
            return _objects[_top - 1];
        }
        return null;
    }
 
    internal bool IsEmpty()
    {
        return _top <= 0;
    }
}