System.Xml.XmlTextReaderImpl.GetChars C# (CSharp) Method

        private int GetChars(int maxCharsCount)
        {
            Debug.Assert(_ps.stream != null && _ps.decoder != null && _ps.bytes != null);
            Debug.Assert(maxCharsCount <= _ps.chars.Length - _ps.charsUsed - 1);

            // determine the maximum number of bytes we can pass to the decoder
            int bytesCount = _ps.bytesUsed - _ps.bytePos;
            if (bytesCount == 0)
            {
                return 0;
            }

            int charsCount;
            bool completed;
            try
            {
                // decode chars
                _ps.decoder.Convert(_ps.bytes, _ps.bytePos, bytesCount, _ps.chars, _ps.charsUsed, maxCharsCount, false, out bytesCount, out charsCount, out completed);
            }
            catch (ArgumentException)
            {
                InvalidCharRecovery(ref bytesCount, out charsCount);
            }

            // move pointers and return
            _ps.bytePos += bytesCount;
            _ps.charsUsed += charsCount;
            Debug.Assert(maxCharsCount >= charsCount);
            return charsCount;
        }