def test_crc32():
"""
When called with a string, rzlib.crc32 should compute its CRC32 and
return it as a unsigned 32 bit integer.
"""
assert rzlib.crc32('') == r_uint(0)
assert rzlib.crc32('\0') == r_uint(3523407757)
assert rzlib.crc32('hello, world.') == r_uint(3358036098)
def test_crc32():
"""
When called with a string, rzlib.crc32 should compute its CRC32 and
return it as a unsigned 32 bit integer.
"""
assert rzlib.crc32('') == r_uint(0)
assert rzlib.crc32('\0') == r_uint(3523407757)
assert rzlib.crc32('hello, world.') == r_uint(3358036098)
def crc32(space, string, start=rzlib.CRC32_DEFAULT_START):
"""
crc32(string[, start]) -- Compute a CRC-32 checksum of string.
An optional starting value can be specified. The returned checksum is
an integer.
"""
ustart = r_uint(r_uint32(start))
checksum = rzlib.crc32(string, ustart)
return space.newint(checksum)
def f(i, check):
bytes = "s" * i
if check == 1:
for j in range(3):
stream = rzlib.deflateInit()
bytes = rzlib.compress(stream, bytes, rzlib.Z_FINISH)
rzlib.deflateEnd(stream)
return bytes
if check == 2:
return str(rzlib.adler32(bytes))
if check == 3:
return str(rzlib.crc32(bytes))
return '?'
def crc32(space, string, start = rzlib.CRC32_DEFAULT_START):
"""
crc32(string[, start]) -- Compute a CRC-32 checksum of string.
An optional starting value can be specified. The returned checksum is
an integer.
"""
ustart = r_uint(start)
checksum = rzlib.crc32(string, ustart)
# This is, perhaps, a little stupid. zlib returns the checksum unsigned.
# CPython exposes it as a signed value, though. -exarkun
# Note that in CPython < 2.6 on 64-bit platforms the result is
# actually unsigned, but it was considered to be a bug so we stick to
# the 2.6 behavior and always return a number in range(-2**31, 2**31).
checksum = unsigned_to_signed_32bit(checksum)
return space.wrap(checksum)
def crc32(space, string, start=rzlib.CRC32_DEFAULT_START):
"""
crc32(string[, start]) -- Compute a CRC-32 checksum of string.
An optional starting value can be specified. The returned checksum is
an integer.
"""
ustart = r_uint(start)
checksum = rzlib.crc32(string, ustart)
# This is, perhaps, a little stupid. zlib returns the checksum unsigned.
# CPython exposes it as a signed value, though. -exarkun
# Note that in CPython < 2.6 on 64-bit platforms the result is
# actually unsigned, but it was considered to be a bug so we stick to
# the 2.6 behavior and always return a number in range(-2**31, 2**31).
checksum = unsigned_to_signed_32bit(checksum)
return space.newint(checksum)
def test_crc32_start_value():
"""
When called with a string and an integer, zlib.crc32 should compute the
CRC32 of the string using the integer as the starting value.
"""
assert rzlib.crc32('', 42) == r_uint(42)
assert rzlib.crc32('\0', 42) == r_uint(163128923)
assert rzlib.crc32('hello, world.', 42) == r_uint(1090960721)
hello = 'hello, '
hellocrc = rzlib.crc32(hello)
world = 'world.'
helloworldcrc = rzlib.crc32(world, hellocrc)
assert helloworldcrc == rzlib.crc32(hello + world)
def test_crc32_start_value():
"""
When called with a string and an integer, zlib.crc32 should compute the
CRC32 of the string using the integer as the starting value.
"""
assert rzlib.crc32('', 42) == r_uint(42)
assert rzlib.crc32('\0', 42) == r_uint(163128923)
assert rzlib.crc32('hello, world.', 42) == r_uint(1090960721)
hello = 'hello, '
hellocrc = rzlib.crc32(hello)
world = 'world.'
helloworldcrc = rzlib.crc32(world, hellocrc)
assert helloworldcrc == rzlib.crc32(hello + world)
def crc32(array, start):
start = rzlib.CRC32_DEFAULT_START if start is None else start.value
string = array.to_str()
checksum = rzlib.crc32(string, rffi.r_uint(start))
return Integer(rffi.r_long(checksum))
