Method BLB_get_data

src/jrd/blb.cpp:627–660

ULONG blb::BLB_get_data(thread_db* tdbb, UCHAR* buffer, SLONG length, bool close)
{
/**************************************
 *
 *      b l b : : g e t _ d a t a
 *
 **************************************
 *
 * Functional description
 *      Get a large hunk of data from a blob, which can then be
 *      closed (if close == true).  Return total number of bytes read.
 *      Don't worry about segment boundaries.
 *
 **************************************/
	SET_TDBB(tdbb);
	BLOB_PTR* p = buffer;

	while (length > 0)
	{
		// I have no idea why this limit is 32768 instead of 32767
		// 1994-August-12 David Schnepper
		USHORT n = (USHORT) MIN(length, (SLONG) 32768);
		n = BLB_get_segment(tdbb, p, n);
		p += n;
		length -= n;
		if (blb_flags & BLB_eof)
			break;
	}

	if (close)
		BLB_close(tdbb);

	return (ULONG)(p - buffer);
}


USHORT blb::BLB_get_segment(thread_db* tdbb, void* segment, USHORT buffer_length)