System.Xml.XmlBinaryReader.ReadPartialUnicodeText C# (CSharp) Méthode

        private void ReadPartialUnicodeText(bool withEndElement, int length)
        {
            // The maxBytesPerRead includes the quota for the XmlBinaryNodeType.TextNode, so we need
            // to account for that.
            const int maxTextNodeLength = 5;
            int maxLength = Math.Max(_maxBytesPerRead - maxTextNodeLength, 0);
            if (length <= maxLength)
            {
                if (withEndElement)
                    ReadText(MoveToAtomicTextWithEndElement(), ValueHandleType.Unicode, length);
                else
                    ReadText(MoveToComplexText(), ValueHandleType.Unicode, length);
            }
            else
            {
                // We also need to make sure we have enough room to insert a new XmlBinaryNodeType.TextNode
                // for the split data.
                int actual = Math.Max(maxLength - maxTextNodeLength, 0);

                // Make sure we break on a char boundary
                if ((actual & 1) != 0)
                    actual--;

                int offset = BufferReader.ReadBytes(actual);

                // We need to make sure we don't split a Unicode surrogate character
                int byteCount = 0;
                char ch = (char)BufferReader.GetInt16(offset + actual - sizeof(char));
                // If the last char is a high surrogate char, then move back
                if (ch >= 0xD800 && ch < 0xDC00)
                    byteCount = sizeof(char);

                // Include the split characters in the count
                BufferReader.Offset = BufferReader.Offset - byteCount;
                actual -= byteCount;
                MoveToComplexText().Value.SetValue(ValueHandleType.Unicode, offset, actual);
                if (this.OutsideRootElement)
                    VerifyWhitespace();

                XmlBinaryNodeType nodeType = (withEndElement ? XmlBinaryNodeType.UnicodeChars32TextWithEndElement : XmlBinaryNodeType.UnicodeChars32Text);
                InsertNode(nodeType, length - actual);
            }
        }