def _decode_section_divider(data):
data_length = len(data)
blend_mode = None
sub_type = None
fp = io.BytesIO(data)
tp = read_fmt("I", fp)[0]
if not SectionDivider.is_known(tp):
warnings.warn("Unknown section divider type (%s)" % tp)
if data_length >= 12:
sig = fp.read(4)
if sig != b"8BIM":
raise Error("Invalid signature in section divider block (%r)" % sig)
blend_mode = fp.read(4)
if not BlendMode.is_known(blend_mode):
warnings.warn("Unknown section divider blend mode (%s)" % blend_mode)
if data_length >= 16:
sub_type = read_fmt("I", fp)[0]
if not SectionDividerSub.is_known(sub_type):
warnings.warn("Unknown section divider sub-type (%s)" % sub_type)
return Divider(tp, blend_mode, sub_type)
