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from chrysacase import ChrysalideTestCase
from pychrysalide.common import BitField
class TestBitFields(ChrysalideTestCase):
"""TestCase for common.BitField*"""
def testDuplicateBitField(self):
"""Check duplicated bitfield value."""
bf = BitField(10, 0)
bf2 = bf.dup()
self.assertEqual(bf, bf2)
self.assertEqual(bf.size, bf2.size)
self.assertEqual(bf.popcount, bf2.popcount)
def testResizeBitField(self):
"""Resize bitfields."""
bf_a = BitField(10, 0)
bf_b = BitField(6, 0)
bf_b.resize(10)
self.assertEqual(bf_a, bf_b)
bf_a = BitField(133, 1)
bf_b = BitField(64, 1)
bf_b.resize(133)
self.assertEqual(bf_a, bf_b)
def testBitFieldValues(self):
"""Evaluate bitfields basic values."""
bf_a = BitField(75, 1)
bf_b = BitField(75, 0)
self.assertNotEqual(bf_a, bf_b)
bf_a = BitField(75, 1)
bf_b = BitField(75, 0)
bf_b.set_all()
self.assertEqual(bf_a, bf_b)
self.assertEqual(bf_a.popcount, bf_b.popcount)
bf_a = BitField(75, 1)
bf_a.reset_all()
bf_b = BitField(75, 0)
self.assertEqual(bf_a, bf_b)
self.assertEqual(bf_a.popcount, bf_b.popcount)
def testBitFieldLogicalOperations(self):
"""Perform logical operations on bitfields."""
bf_a = BitField(75, 1)
bf_b = BitField(75, 0)
self.assertEqual(bf_a.size, bf_b.size)
bf_f = bf_a & bf_b
self.assertEqual(bf_f, bf_b)
self.assertEqual(bf_f.popcount, bf_b.popcount)
bf_f = bf_a | bf_b
self.assertEqual(bf_f, bf_a)
self.assertEqual(bf_f.popcount, bf_a.popcount)
def testBitFieldLogicalOperationsAt(self):
"""Perform logical operations on bitfields at a given position."""
bf_a = BitField(75, 0)
bf_b = BitField(4, 1)
bf_b.reset(2)
bf_a.or_at(bf_b, 63)
self.assertFalse(bf_a.test(62))
self.assertTrue(bf_a.test(63))
self.assertTrue(bf_a.test(64))
self.assertFalse(bf_a.test(65))
self.assertTrue(bf_a.test(66))
self.assertFalse(bf_a.test(67))
bf_a = BitField(75, 0)
bf_a.or_at(bf_b, 60)
self.assertFalse(bf_a.test(59))
self.assertTrue(bf_a.test(60))
self.assertTrue(bf_a.test(61))
self.assertFalse(bf_a.test(62))
self.assertTrue(bf_a.test(63))
self.assertFalse(bf_a.test(64))
def testBitFieldSwitch(self):
"""Switch various bits in bitfields."""
bf_1 = BitField(75, 1)
bf_0 = BitField(75, 0)
bf_t = BitField(75, 0)
for i in range(75):
bf_t.set(i)
self.assertEqual(bf_t, bf_1)
self.assertEqual(bf_t.popcount, bf_1.popcount)
for i in range(75):
bf_t.reset(i)
self.assertEqual(bf_t, bf_0)
self.assertEqual(bf_t.popcount, bf_0.popcount)
def testBitFieldBits(self):
"""Test bits in bitfields."""
bf = BitField(54, 1)
self.assertTrue(bf.test(0))
self.assertTrue(bf.test(53))
self.assertTrue(bf.test_all(0, 54))
self.assertFalse(bf.test_none(0, 54))
bf = BitField(54, 0)
self.assertFalse(bf.test(0))
self.assertFalse(bf.test(53))
self.assertFalse(bf.test_all(0, 54))
self.assertTrue(bf.test_none(0, 54))
def testBitFieldWithBitField(self):
"""Test bits in bitfields against other bitfields."""
bf = BitField(32, 0)
bf.set(8, 16)
mask = BitField(8, 1)
self.assertTrue(bf.test_ones_with(8, mask))
self.assertTrue(bf.test_ones_with(16, mask))
self.assertFalse(bf.test_ones_with(17, mask))
self.assertTrue(bf.test_zeros_with(24, mask))
bf = BitField(256, 0)
bf.set(60, 8)
bf.set(126, 10)
mask = BitField(4, 1)
self.assertTrue(bf.test_zeros_with(8, mask))
self.assertTrue(bf.test_zeros_with(122, mask))
self.assertFalse(bf.test_zeros_with(58, mask))
self.assertFalse(bf.test_ones_with(58, mask))
self.assertTrue(bf.test_ones_with(60, mask))
self.assertFalse(bf.test_zeros_with(63, mask))
self.assertTrue(bf.test_ones_with(64, mask))
self.assertFalse(bf.test_zeros_with(65, mask))
self.assertFalse(bf.test_ones_with(65, mask))
self.assertFalse(bf.test_zeros_with(125, mask))
self.assertFalse(bf.test_ones_with(125, mask))
self.assertTrue(bf.test_ones_with(128, mask))
self.assertFalse(bf.test_zeros_with(129, mask))
self.assertTrue(bf.test_ones_with(132, mask))
self.assertFalse(bf.test_zeros_with(133, mask))
self.assertFalse(bf.test_ones_with(133, mask))
self.assertTrue(bf.test_zeros_with(136, mask))
def testPopCountForBitField(self):
"""Count bits set to 1 in bitfield."""
bf = BitField(65, 1)
self.assertEqual(bf.size, 65)
self.assertEqual(bf.popcount, 65)
def testBitFieldComparison(self):
"""Check bitfield comparison."""
bf_a = BitField(9, 0)
bf_a.set(0)
bf_a.set(5)
bf_b = BitField(9, 1)
self.assertNotEqual(bf_a, bf_b)
def testSearchOfSetBit(self):
"""Find the next set bit in a bit field."""
size = 128
bf = BitField(size, 0)
bits = [ 0, 1, 50, 63, 64, 65, 111 ]
for b in bits:
bf.set(b)
prev = None
found = []
while prev is None or prev < size:
if prev is None:
f = bf.find_next_set()
else:
f = bf.find_next_set(prev)
if f < size:
found.append(f)
prev = f
self.assertEqual(found, bits)
def testRealCase00(self):
"""Test bits in bitfields against other bitfields in a real case (#00)."""
bf = BitField(128, 0)
for b in [ 0, 50, 54, 58, 66, 70, 98 ]:
bf.set(b)
mask = BitField(128, 0)
for b in [ 0, 51 ]:
mask.set(b)
self.assertFalse(bf.test_zeros_with(0, mask))
self.assertTrue(bf.test_zeros_with(1, mask))
bf = BitField(32, 0)
mask = BitField(32, 0)
self.assertTrue(bf.test_zeros_with(0, mask))
for b in [ 0, 8, 9, 10 ]:
mask.set(b)
self.assertTrue(bf.test_zeros_with(0, mask))
bf = BitField(32, 1)
self.assertFalse(bf.test_zeros_with(0, mask))
self.assertTrue(bf.test_ones_with(0, mask))
def testRealCase01(self):
"""Test bits in bitfields against other bitfields in a real case (#01)."""
bf = BitField(128, 0)
mask = BitField(128, 0)
bits = [ 0, 50, 54, 58, 66, 70, 98 ]
for b in bits:
mask.set(b)
bf.or_at(mask, 0)
self.assertEqual(mask.popcount, len(bits))
self.assertEqual(mask.popcount, bf.popcount)
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