try:
						row[field_name] = unpack("i", toread[0:4])[0]
						if not row[field_name] >= 0:
							row[field_name] = -1
						toread = toread[4:]
					except:
						try:
							ei = sys.exc_info()
						finally:
							del ei
						row[field_name] = unpack("H", toread[0:2])[0]
						if not row[field_name] >= 0:
							row[field_name] = -1
						toread = toread[2:]