/// <summary>
/// Reads a stream of bytes from the specified column, starting at location indicated by <paramref name="dataOffset" />, into the buffer, starting at the location indicated by <paramref
/// name="bufferOffset" />.
/// </summary>
/// <param name="ordinal"> The zero-based column ordinal. </param>
/// <param name="dataOffset"> The index within the row from which to begin the read operation. </param>
/// <param name="buffer"> The buffer into which to copy the data. </param>
/// <param name="bufferOffset"> The index with the buffer to which the data will be copied. </param>
/// <param name="length"> The maximum number of characters to read. </param>
/// <returns> The actual number of bytes read. </returns>
public override long GetBytes(int ordinal, long dataOffset, byte[] buffer, int bufferOffset, int length)
{
// [APIS-217] Check the index is correct.
if (ordinal >= FieldCount || ordinal < 0)
{
throw new IndexOutOfRangeException();
}
if (currentRow > resultCount) //Are we at the end of the data?
{
throw new InvalidOperationException(Utils.GetStr(MsgId.BufferIndexMustBeValidIndexInBuffer));
}
object val = GetValue(ordinal);
string type = GetColumnTypeName(ordinal);
if (type != "BLOB" && type != "CLOB" && type != "BIT" && type != "VARBIT")
{
throw new CUBRIDException(Utils.GetStr(MsgId.GetBytesCanBeCalledOnlyOnBinaryColumns));
}
// [APIS-217] Check the offset value is correct.
if (dataOffset < 0)
{
throw new IndexOutOfRangeException(Utils.GetStr(MsgId.DataOffsetMustBeValidPositionInField));
}
// [APIS-217] If buffer is a null pointer, return 0.
if (buffer == null)
{
return(0);
}
if (bufferOffset >= buffer.Length || bufferOffset < 0)
{
throw new IndexOutOfRangeException(Utils.GetStr(MsgId.BufferIndexMustBeValidIndexInBuffer));
}
if (buffer.Length < (bufferOffset + length))
{
throw new ArgumentException(Utils.GetStr(MsgId.BufferNotLargeEnoughToHoldRequestedData));
}
//[APIS-217] Does not determine the val is a NULL pointer.
if (val == null)
{
return(0);
}
byte[] bytes;
//[APIS-217] CUBRIDDataReader.GetBytes, threw an exception.
if (type == "BIT" || type == "VARBIT")
{
bytes = (byte[])GetObject(ordinal);
Debug.Assert(bytes != null, "bit != null");
if (dataOffset < bytes.Length && dataOffset + length <= bytes.Length)
{
for (long i = 0; i < length; i++)
{
buffer[i + bufferOffset] = bytes[i + dataOffset];
}
}
else
{
throw new IndexOutOfRangeException(Utils.GetStr(MsgId.DataOffsetMustBeValidPositionInField));
}
return(length);
}
if (type == "BLOB")
{
CUBRIDBlob blob = val as CUBRIDBlob;
// [APIS-217] Check the offset value is correct.
Debug.Assert(blob != null, "blob != null");
if (dataOffset < blob.BlobLength && dataOffset + length <= blob.BlobLength)
{
bytes = blob.GetBytes(dataOffset + 1, length);
}
else
{
throw new IndexOutOfRangeException(Utils.GetStr(MsgId.DataOffsetMustBeValidPositionInField));
}
}
else // if it is a CLOB type.
{
CUBRIDClob clob = val as CUBRIDClob;
Debug.Assert(clob != null, "clob != null");
if (dataOffset < clob.ClobLength && dataOffset + length <= clob.ClobLength)
{
bytes = conn.GetEncoding().GetBytes(clob.GetString(dataOffset + 1, length));
}
else
{
throw new IndexOutOfRangeException(Utils.GetStr(MsgId.DataOffsetMustBeValidPositionInField));
}
}
dataOffset = 0;
Buffer.BlockCopy(bytes, (int)dataOffset, buffer, bufferOffset, length);
return(length);
}
