IncrementalReadCharsDecoder.cs

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namespace System.Xml;
 
internal sealed class IncrementalReadCharsDecoder : IncrementalReadDecoder
{
    private char[] _buffer;
 
    private int _startIndex;
 
    private int _curIndex;
 
    private int _endIndex;
 
    internal override int DecodedCount => _curIndex - _startIndex;
 
    internal override bool IsFull => _curIndex == _endIndex;
 
    internal override int Decode(char[] chars, int startPos, int len)
    {
        int num = _endIndex - _curIndex;
        if (num > len)
        {
            num = len;
        }
        Buffer.BlockCopy(chars, startPos * 2, _buffer, _curIndex * 2, num * 2);
        _curIndex += num;
        return num;
    }
 
    internal override int Decode(string str, int startPos, int len)
    {
        int num = _endIndex - _curIndex;
        if (num > len)
        {
            num = len;
        }
        str.CopyTo(startPos, _buffer, _curIndex, num);
        _curIndex += num;
        return num;
    }
 
    internal override void Reset()
    {
    }
 
    internal override void SetNextOutputBuffer(Array buffer, int index, int count)
    {
        _buffer = (char[])buffer;
        _startIndex = index;
        _curIndex = index;
        _endIndex = index + count;
    }
}