DetectEncoding()

void System.IO.StreamReader.DetectEncoding ( )

inlineprivateinherited

Definition at line 447 of file StreamReader.cs.

    {
        if (_byteLen < 2)
        {
            return;
        }
        _detectEncoding = false;
        bool flag = false;
        if (_byteBuffer[0] == 254 && _byteBuffer[1] == byte.MaxValue)
        {
            _encoding = Encoding.BigEndianUnicode;
            CompressBuffer(2);
            flag = true;
        }
        else if (_byteBuffer[0] == byte.MaxValue && _byteBuffer[1] == 254)
        {
            if (_byteLen < 4 || _byteBuffer[2] != 0 || _byteBuffer[3] != 0)
            {
                _encoding = Encoding.Unicode;
                CompressBuffer(2);
                flag = true;
            }
            else
            {
                _encoding = Encoding.UTF32;
                CompressBuffer(4);
                flag = true;
            }
        }
        else if (_byteLen >= 3 && _byteBuffer[0] == 239 && _byteBuffer[1] == 187 && _byteBuffer[2] == 191)
        {
            _encoding = Encoding.UTF8;
            CompressBuffer(3);
            flag = true;
        }
        else if (_byteLen >= 4 && _byteBuffer[0] == 0 && _byteBuffer[1] == 0 && _byteBuffer[2] == 254 && _byteBuffer[3] == byte.MaxValue)
        {
            _encoding = new UTF32Encoding(bigEndian: true, byteOrderMark: true);
            CompressBuffer(4);
            flag = true;
        }
        else if (_byteLen == 2)
        {
            _detectEncoding = true;
        }
        if (flag)
        {
            _decoder = _encoding.GetDecoder();
            int maxCharCount = _encoding.GetMaxCharCount(_byteBuffer.Length);
            if (maxCharCount > _maxCharsPerBuffer)
            {
                _charBuffer = new char[maxCharCount];
            }
            _maxCharsPerBuffer = maxCharCount;
        }
    }

References System.IO.StreamReader._byteBuffer, System.IO.StreamReader._byteLen, System.IO.StreamReader._charBuffer, System.IO.StreamReader._decoder, System.IO.StreamReader._detectEncoding, System.IO.StreamReader._encoding, System.IO.StreamReader._maxCharsPerBuffer, System.Text.Encoding.BigEndianUnicode, System.IO.StreamReader.CompressBuffer(), System.Text.Encoding.GetDecoder(), System.Text.Encoding.GetMaxCharCount(), System.Text.Encoding.Unicode, System.Text.Encoding.UTF32, and System.Text.Encoding.UTF8.

Referenced by System.IO.StreamReader.ReadAsyncInternal(), System.IO.StreamReader.ReadBuffer(), System.IO.StreamReader.ReadBuffer(), and System.IO.StreamReader.ReadBufferAsync().