def test_from_ctype(self):
ae = self.assertEqual
data_le = (b"\xFF\xFF"
b"\x03"
b"\x01"
b"\x01\x02\x03\x04"
b"\x05\x06\x07\x08\x09\x0A\x0B\x0C")
data_be = (b"\xFF\xFF"
b"\x03"
b"\x01"
b"\x04\x03\x02\x01"
b"\x0C\x0B\x0A\x09\x08\x07\x06\x05")
value = (0x04030201 << 64) | 0x0C0B0A0908070605
value = -value
value = Decimal(value) / Decimal(10**3)
value_le = decimal_le.from_buffer_copy(data_le)
value_le = DECIMALToDecimal.from_ctype(value_le)
value_be = decimal_be.from_buffer_copy(data_be)
value_be = DECIMALToDecimal.from_ctype(value_be)
ae(value_le, value)
ae(value_be, value)
def from_stream(cls, stream, offset=None, byte_order=LITTLE_ENDIAN):
"""Creates a ``Decimal`` object from a stream.
:type stream: :class:`lf.dec.IStream`
:param stream: A stream that contains the DECIMAL structure.
:type offset: ``int`` or ``None``
:param offset: The start of the DECIMAL structure in the stream.
:type byte_order: constant
:param byte_order: The byte order to use (from :mod:`lf.dtypes`)
:rtype: ``Decimal``
:returns: The corresponding ``Decimal`` object.
"""
if offset is not None:
stream.seek(offset, SEEK_SET)
# end if
data = stream.read(16)
if byte_order == LITTLE_ENDIAN:
ctype_value = decimal_le.from_buffer_copy(data)
else:
ctype_value = decimal_be.from_buffer_copy(data)
# end if
value = (ctype_value.hi32 << 64) | ctype_value.lo64
if ctype_value.sign:
value = -value
# end if
return Decimal(value) / Decimal(10**ctype_value.scale)
def test_from_ctype(self):
ae = self.assertEqual
data_le = b"\xFF\xFF" b"\x03" b"\x01" b"\x01\x02\x03\x04" b"\x05\x06\x07\x08\x09\x0A\x0B\x0C"
data_be = b"\xFF\xFF" b"\x03" b"\x01" b"\x04\x03\x02\x01" b"\x0C\x0B\x0A\x09\x08\x07\x06\x05"
value = (0x04030201 << 64) | 0x0C0B0A0908070605
value = -value
value = Decimal(value) / Decimal(10 ** 3)
value_le = decimal_le.from_buffer_copy(data_le)
value_le = DECIMALToDecimal.from_ctype(value_le)
value_be = decimal_be.from_buffer_copy(data_be)
value_be = DECIMALToDecimal.from_ctype(value_be)
ae(value_le, value)
ae(value_be, value)
