Npgsql.WriteBuffer.WriteDouble C# (CSharp) Method

        public void WriteDouble(double d)
        {
            Contract.Requires(WriteSpaceLeft >= sizeof(double));
            _bitConverterUnion.float8 = d;
            var pos = _writePosition;
            if (BitConverter.IsLittleEndian)
            {
                _buf[pos++] = _bitConverterUnion.b7;
                _buf[pos++] = _bitConverterUnion.b6;
                _buf[pos++] = _bitConverterUnion.b5;
                _buf[pos++] = _bitConverterUnion.b4;
                _buf[pos++] = _bitConverterUnion.b3;
                _buf[pos++] = _bitConverterUnion.b2;
                _buf[pos++] = _bitConverterUnion.b1;
                _buf[pos++] = _bitConverterUnion.b0;
            }
            else
            {
                _buf[pos++] = _bitConverterUnion.b0;
                _buf[pos++] = _bitConverterUnion.b1;
                _buf[pos++] = _bitConverterUnion.b2;
                _buf[pos++] = _bitConverterUnion.b3;
                _buf[pos++] = _bitConverterUnion.b4;
                _buf[pos++] = _bitConverterUnion.b5;
                _buf[pos++] = _bitConverterUnion.b6;
                _buf[pos++] = _bitConverterUnion.b7;
            }
            _writePosition = pos;
        }