def test_packing_and_unpacking():
for width in [1,2]:
min_value = -(2 ** (16 * width) / 2)
max_value = -min_value - 1
edge_cases = [min_value, max_value, -1, 0, 1]
sample = random.sample(xrange(min_value, max_value), 10000)
for i in itertools.chain(edge_cases, sample):
packed = util.pack_value(i, width)
unpacked = util.unpack_values(packed)
nose.assert_equal(i, unpacked)
def _expand_register_value(self, addr, value):
"""Returns a dict of register addresses to register values.
A40 registers can have register values greater than 2 bytes. In which
case the value is split across contiguous registers.
This function takes a register address; looks up how wide it expects the
value to be; and returns a mapping of register addresses to values.
"""
assert addr in _ALL_REGISTERS
width = _ALL_REGISTERS[addr]
to_return = {}
for i, value in enumerate(util.pack_value(value, width)):
to_return[addr + i] = value
return to_return