def test_bitview_getitem__single_byte_bitslice_with_bits(self):
for i in range(0, 256):
for j in range(0, 8):
bv = BitView(bytearray([i]))
bv_slice = bv[float(j) / 8:]
ba = bitarray(endian='little')
ba.frombytes(chr(i) if PY2 else bytes([i]))
ba_slice = ba[j:]
self.assertEqualBitArrayBitView(ba_slice, bv_slice)
def test_bitview_getitem__single_byte_bitslice_with_bits(self):
for i in range(0, 256):
for j in range(0, 8):
bv = BitView(bytearray([i]))
bv_slice = bv[float(j) / 8:]
ba = bitarray(endian='little')
ba.frombytes(chr(i) if PY2 else bytes([i]))
ba_slice = ba[j:]
self.assertEqualBitArrayBitView(ba_slice, bv_slice)
def test_bitview__positive_slicing(self):
for i in range(0, 100):
ba = self._create_random_bit_array()
bv = BitView(self._bitarray_to_bytes(ba), stop=float(ba.length()) / 8)
self.assertEqualBitArrayBitView(ba, bv)
slice_start_in_bits = random.choice(range(0, ba.length() + 10))
slice_end_in_bits = random.choice(range(slice_start_in_bits, ba.length() + 10))
ba_slice = ba[slice_start_in_bits:slice_end_in_bits]
bv_slice = bv[float(slice_start_in_bits) / 8:float(slice_end_in_bits) / 8]
self.assertEqualBitArrayBitView(ba_slice, bv_slice)
def test_bitview__positive_slicing(self):
for i in range(0, 100):
ba = self._create_random_bit_array()
bv = BitView(self._bitarray_to_bytes(ba),
stop=float(ba.length()) / 8)
self.assertEqualBitArrayBitView(ba, bv)
slice_start_in_bits = random.choice(range(0, ba.length() + 10))
slice_end_in_bits = random.choice(
range(slice_start_in_bits,
ba.length() + 10))
ba_slice = ba[slice_start_in_bits:slice_end_in_bits]
bv_slice = bv[float(slice_start_in_bits) /
8:float(slice_end_in_bits) / 8]
self.assertEqualBitArrayBitView(ba_slice, bv_slice)
def test_buffer_bits__simple(self):
class Foo(Buffer):
f_int = int_field(sign='unsigned',
where=(bytes_ref[7].bits[0:4] +
bytes_ref[6].bits[0:4] +
bytes_ref[5].bits[0:4] +
bytes_ref[4].bits[0:4] +
bytes_ref[3].bits[0:4] +
bytes_ref[2].bits[0:4] +
bytes_ref[1].bits[0:4] +
bytes_ref[0].bits[0:4]))
self.assertEqual(7.5, Foo.byte_size)
for n in (0x12345678, 0x87654321, 0, 1, 0x10000000, 0xFF000000):
foo = Foo()
foo.f_int = n
packed_value = foo.pack()
self.assertEqual(8, len(packed_value))
packed_result = bytearray(8)
for i in range(8):
packed_result[7 - i] = (foo.f_int >> (i * 4)) & 0x0F
self.assertEqual(packed_result, packed_value)
foo = Foo()
foo.unpack(packed_result)
self.assertEqual(foo.f_int, n)
def evaluate(self, ctx):
range_list = self.parent_range_ref.deref(ctx)
assert len(range_list) >= 1
bit_range = SequentialRange(float(self.start.deref(ctx)) / 8, float(self.stop.deref(ctx)) / 8)
i, sum_length = range_list.find_relative_container_index(bit_range.start)
if i is None:
raise ValueError("Bit offset {0} is out of range for range sequence {1!r}".format(
int(bit_range.start * 8), range_list))
if bit_range.is_open():
subrange_start = range_list[i].start + bit_range.start - sum_length
return SequentialRangeList([SequentialRange(subrange_start, range_list[i].stop)] + range_list[i + 1:])
bit_range_remaining_len = bit_range.byte_length()
result = []
for i in range(i, len(range_list)):
r = range_list[i]
subrange_start = r.start + bit_range.start - sum_length
if r.is_open() or (r.stop - subrange_start) >= bit_range_remaining_len:
subrange_stop = subrange_start + bit_range_remaining_len
else:
subrange_stop = r.stop
result.append(SequentialRange(subrange_start, subrange_stop))
bit_range_remaining_len -= (subrange_stop - subrange_start)
if bit_range_remaining_len == 0:
break
if bit_range_remaining_len > 0:
raise ValueError("Bit range {0!r} is out of range for parent range {1!r}".format(bit_range, range_list))
return SequentialRangeList(result)
def test_iadd_1(self):
a = bytearray(b'\xd3\x94Q`\xb1\x93\x17\xed\xb2W\xa5\x00')
b = bytearray(b'MK\xa3Li\xf9>\x039')
bv1 = BitAwareByteArray(bytearray(a), start=0, stop=11.125)
bv2 = BitView(bytearray(b), start=0, stop=8.75)
bv1 += bv2
a[-1] &= 0x01
a[-1] |= (b[0] & 0x7F) << 1
for i in range(len(b) - 1):
a.append((b[i] >> 7) + ((b[i + 1] & 0x7F) << 1))
self.assertEquals(list(bv1), list(a))
def test_iadd_1(self):
a = bytearray(b'\xd3\x94Q`\xb1\x93\x17\xed\xb2W\xa5\x00')
b = bytearray(b'MK\xa3Li\xf9>\x039')
bv1 = BitAwareByteArray(bytearray(a), start=0, stop=11.125)
bv2 = BitView(bytearray(b), start=0, stop=8.75)
bv1 += bv2
a[-1] &= 0x01
a[-1] |= (b[0] & 0x7F) << 1
for i in range(len(b) - 1):
a.append((b[i] >> 7) + ((b[i + 1] & 0x7F) << 1))
self.assertEquals(list(bv1), list(a))
def evaluate(self, ctx):
range_list = self.parent_range_ref.deref(ctx)
assert len(range_list) >= 1
bit_range = SequentialRange(
float(self.start.deref(ctx)) / 8,
float(self.stop.deref(ctx)) / 8)
i, sum_length = range_list.find_relative_container_index(
bit_range.start)
if i is None:
raise ValueError(
"Bit offset {0} is out of range for range sequence {1!r}".
format(int(bit_range.start * 8), range_list))
if bit_range.is_open():
subrange_start = range_list[i].start + bit_range.start - sum_length
return SequentialRangeList(
[SequentialRange(subrange_start, range_list[i].stop)] +
range_list[i + 1:])
bit_range_remaining_len = bit_range.byte_length()
result = []
for i in range(i, len(range_list)):
r = range_list[i]
subrange_start = r.start + bit_range.start - sum_length
if r.is_open() or (r.stop -
subrange_start) >= bit_range_remaining_len:
subrange_stop = subrange_start + bit_range_remaining_len
else:
subrange_stop = r.stop
result.append(SequentialRange(subrange_start, subrange_stop))
bit_range_remaining_len -= (subrange_stop - subrange_start)
if bit_range_remaining_len == 0:
break
if bit_range_remaining_len > 0:
raise ValueError(
"Bit range {0!r} is out of range for parent range {1!r}".
format(bit_range, range_list))
return SequentialRangeList(result)
def test_buffer_bits__complex(self):
class Foo(Buffer):
f_int = int_field(sign='unsigned',
where=(bytes_ref[0:2].bits[4:12] + bytes_ref[2:4].bits[4:12] +
bytes_ref[4:6].bits[4:12] + bytes_ref[6:8].bits[4:12]))
self.assertEqual(7.5, Foo.byte_size)
for n in (0xFF000000, 0x12345678, 0x87654321, 0, 1, 0x10000000, 0xFF000000):
foo = Foo()
foo.f_int = n
packed_value = foo.pack()
self.assertEqual(8, len(packed_value))
ba = bitarray('0' * (8 * 8), endian='little')
int_pack = struct.pack("<L", foo.f_int)
for i in range(4):
b = bitarray(endian='little')
b.frombytes(bytes([int_pack[i]]) if not PY2 else int_pack[i])
ba[i * 2 * 8 + 4:i * 2 * 8 + 4 + 8] = b
self.assertEqual(ba.tobytes(), packed_value)
def test_buffer_bits__simple(self):
class Foo(Buffer):
f_int = int_field(
sign='unsigned',
where=(bytes_ref[7].bits[0:4] + bytes_ref[6].bits[0:4] +
bytes_ref[5].bits[0:4] + bytes_ref[4].bits[0:4] +
bytes_ref[3].bits[0:4] + bytes_ref[2].bits[0:4] +
bytes_ref[1].bits[0:4] + bytes_ref[0].bits[0:4]))
self.assertEqual(7.5, Foo.byte_size)
for n in (0x12345678, 0x87654321, 0, 1, 0x10000000, 0xFF000000):
foo = Foo()
foo.f_int = n
packed_value = foo.pack()
self.assertEqual(8, len(packed_value))
packed_result = bytearray(8)
for i in range(8):
packed_result[7 - i] = (foo.f_int >> (i * 4)) & 0x0F
self.assertEqual(packed_result, packed_value)
foo = Foo()
foo.unpack(packed_result)
self.assertEqual(foo.f_int, n)
def test_buffer_bits__complex(self):
class Foo(Buffer):
f_int = int_field(
sign='unsigned',
where=(bytes_ref[0:2].bits[4:12] + bytes_ref[2:4].bits[4:12] +
bytes_ref[4:6].bits[4:12] + bytes_ref[6:8].bits[4:12]))
self.assertEqual(7.5, Foo.byte_size)
for n in (0xFF000000, 0x12345678, 0x87654321, 0, 1, 0x10000000,
0xFF000000):
foo = Foo()
foo.f_int = n
packed_value = foo.pack()
self.assertEqual(8, len(packed_value))
ba = bitarray('0' * (8 * 8), endian='little')
int_pack = struct.pack("<L", foo.f_int)
for i in range(4):
b = bitarray(endian='little')
b.frombytes(bytes([int_pack[i]]) if not PY2 else int_pack[i])
ba[i * 2 * 8 + 4:i * 2 * 8 + 4 + 8] = b
self.assertEqual(ba.tobytes(), packed_value)
def test_bitview_getitem__single_byte_bitslice(self):
for i in range(0, 256):
for j in range(0, 8):
bv = BitView(bytearray([i]))
self.assertEqual(list(bv[float(j) / 8:])[0], i >> j)
def junk_generator(size):
import string
import random
chars = string.ascii_letters + string.digits + string.punctuation
return ''.join(random.choice(chars) for x in range(size)).encode('ASCII')
def _create_random_bit_array(self):
length_in_bits = random.randint(0, 8 * 16)
return bitarray("".join(
random.choice(('0', '1')) for i in range(length_in_bits)),
endian='little')
def _create_random_bit_array(self):
length_in_bits = random.randint(0, 8 * 16)
return bitarray("".join(random.choice(('0', '1')) for i in range(length_in_bits)), endian='little')
def junk_generator(size):
import string
import random
chars = string.ascii_letters + string.digits + string.punctuation
return ''.join(random.choice(chars) for x in range(size)).encode('ASCII')
def test_bitview_getitem__single_byte_bitslice(self):
for i in range(0, 256):
for j in range(0, 8):
bv = BitView(bytearray([i]))
self.assertEqual(list(bv[float(j) / 8:])[0], i >> j)
