Example #1
0
        /// <summary>
        /// Performs the actual reading and converting
        /// NOTE: This assumes that buffer, index and count are all valid, we're not closed (!IsClosed) and that there is data left (IsDataLeft())
        /// </summary>
        /// <param name="buffer"></param>
        /// <param name="index"></param>
        /// <param name="count"></param>
        /// <returns></returns>
        private int InternalRead(char[] buffer, int index, int count)
        {
            Debug.Assert(buffer != null, "Null output buffer");
            Debug.Assert((index >= 0) && (count >= 0) && (index + count <= buffer.Length), $"Bad count: {count} or index: {index}");
            Debug.Assert(!IsClosed, "Can't read while textreader is closed");

            try
            {
                int    byteBufferUsed;
                byte[] byteBuffer = PrepareByteBuffer(count, out byteBufferUsed);
                byteBufferUsed += _reader.GetBytesInternalSequential(_columnIndex, byteBuffer, byteBufferUsed, byteBuffer.Length - byteBufferUsed);

                if (byteBufferUsed > 0)
                {
                    return(DecodeBytesToChars(byteBuffer, byteBufferUsed, buffer, index, count));
                }
                else
                {
                    // Nothing to read, or nothing read
                    return(0);
                }
            }
            catch (SqlException ex)
            {
                // Read can't throw a SqlException - so wrap it in an IOException
                throw ADP.ErrorReadingFromStream(ex);
            }
        }
Example #2
0
        public override int Read(byte[] buffer, int offset, int count)
        {
            ValidateReadParameters(buffer, offset, count);
            if (!CanRead)
            {
                throw ADP.ObjectDisposed(this);
            }
            if (_currentTask != null)
            {
                throw ADP.AsyncOperationPending();
            }

            try
            {
                return(_reader.GetBytesInternalSequential(_columnIndex, buffer, offset, count, _readTimeout));
            }
            catch (SqlException ex)
            {
                // Stream.Read() can't throw a SqlException - so wrap it in an IOException
                throw ADP.ErrorReadingFromStream(ex);
            }
        }