Method copy_blob

src/jrd/blb.cpp:2130–2177

blb* blb::copy_blob(thread_db* tdbb, const bid* source, bid* destination,
					  USHORT bpb_length, const UCHAR* bpb,
					  USHORT destPageSpaceID)
{
/**************************************
 *
 *      c o p y _ b l o b
 *
 **************************************
 *
 * Functional description
 *      Make a copy of an existing blob.
 *
 **************************************/
	SET_TDBB(tdbb);

	Request* request = tdbb->getRequest();
	jrd_tra* transaction = request ? request->req_transaction : tdbb->getTransaction();
	blb* input = open2(tdbb, transaction, source, bpb_length, bpb);
	blb* output = create(tdbb, transaction, destination);
	output->blb_sub_type = input->blb_sub_type;
	if (destPageSpaceID) {
		output->blb_pg_space_id = destPageSpaceID;
	}

	if (input->blb_flags & BLB_stream) {
		output->blb_flags |= BLB_stream;
	}

	HalfStaticArray<UCHAR, 2048> buffer;
	UCHAR* buff = buffer.getBuffer(input->isSegmented() ?
		input->blb_max_segment :
		MIN(input->blb_length, 32768));

	while (true)
	{
		const USHORT length = input->BLB_get_segment(tdbb, buff, buffer.getCapacity());
		if (input->blb_flags & BLB_eof) {
			break;
		}
		output->BLB_put_segment(tdbb, buff, length);
	}

	input->BLB_close(tdbb);
	output->BLB_close(tdbb);

	return output;
}


void blb::delete_blob(thread_db* tdbb, ULONG prior_page)