def locate_message(self, mem, message_id):
"""Return the location where the messege data is stored.
Args:
mem (mmap): The input stream of ROM.
message_id: An ID.
Returns:
TBW
"""
count, group = self._do_select_message_group(message_id)
mem.seek(self.mapper.from_cpu(self.addr_group) + group)
buffer1 = mem.read(3)
# In fact, the array in RHS is
# {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80}.
shift = self.shiftbit_array[buffer1[0] & 0x07]
addr = get_bits(buffer1, 0, 0xFFFFF8) + self.addr_message
delims = self.delimiters
# The loop counter depends on message id & 0x0007.
for _ in range(count):
code = b'\xFFFF' # dummy value
while not code in delims:
addr, shift, code = self.decode(mem, addr, shift)
return addr, shift
def test_get_bits(self):
"""Test function dqutils.bit.get_bits."""
data = [i for i in range(0x06)]
self.assertEqual(get_bits(data, 0, 0xFF00), 0x0001)
self.assertEqual(get_bits(data, 1, 0xFFFF), 0x0201)
self.assertEqual(get_bits(data, 0, 0x0100), 0x0001)
def _do_get_value(self, byte_string):
return get_bits(byte_string, self.offset, self.mask)