def _get_binary(data, position, dummy0, opts, dummy1):
"""Decode a BSON binary to bson.binary.Binary or python UUID."""
length, subtype = _UNPACK_LENGTH_SUBTYPE(data[position:position + 5])
position += 5
if subtype == 2:
length2 = _UNPACK_INT(data[position:position + 4])[0]
position += 4
if length2 != length - 4:
raise InvalidBSON("invalid binary (st 2) - lengths don't match!")
length = length2
end = position + length
if subtype in (3, 4):
# Java Legacy
uuid_representation = opts.uuid_representation
if uuid_representation == JAVA_LEGACY:
java = data[position:end]
value = uuid.UUID(bytes=java[0:8][::-1] + java[8:16][::-1])
# C# legacy
elif uuid_representation == CSHARP_LEGACY:
value = uuid.UUID(bytes_le=data[position:end])
# Python
else:
value = uuid.UUID(bytes=data[position:end])
return value, end
# Python3 special case. Decode subtype 0 to 'bytes'.
if PY3 and subtype == 0:
value = data[position:end]
else:
value = Binary(data[position:end], subtype)
return value, end
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