Method getSegment

src/jrd/jrd.cpp:3573–3621

int JBlob::getSegment(CheckStatusWrapper* user_status, unsigned int buffer_length, void* buffer,
	unsigned int* segment_length)
{
/**************************************
 *
 *	g d s _ $ g e t _ s e g m e n t
 *
 **************************************
 *
 * Functional description
 *	Get a segment from a blob.
 *
 **************************************/
	unsigned int len = 0;
	int cc = IStatus::RESULT_ERROR;

	try
	{
		EngineContextHolder tdbb(user_status, this, FB_FUNCTION);
		check_database(tdbb);

		try
		{
			len = getHandle()->BLB_get_segment(tdbb, buffer, buffer_length);
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status, "JBlob::getSegment");
			return cc;
		}

		if (getHandle()->blb_flags & BLB_eof)
			cc = IStatus::RESULT_NO_DATA;
		else if (getHandle()->getFragmentSize())
			cc = IStatus::RESULT_SEGMENT;
		else
			cc = IStatus::RESULT_OK;
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return cc;
	}

	successful_completion(user_status);
	if (segment_length)
		*segment_length = len;
	return cc;
}


int JAttachment::getSlice(CheckStatusWrapper* user_status, ITransaction* tra, ISC_QUAD* array_id,