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# vim: ts=8 sw=8 noexpandtab
#
# CRC code generator
#
# Copyright (c) 2020-2023 Michael Büsch <m@bues.ch>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
from libcrcgen.generator import *
from libcrcgen.reference import *
from libcrcgen.util import *
__all__ = [
"CrcGenTest",
]
class CrcGenTest(CrcGen):
def runTests(self, name=None, extra=None):
tmpdir = None
try:
import random
rng = random.Random()
rng.seed(424242)
print(f"Testing{(' ' + name) if name else ''} "
f"P=0x{self._P:X}, "
f"nrCrcBits={self._nrCrcBits}, "
f"shiftRight={int(bool(self._shiftRight))}, "
f"nrDataBits={self._nrDataBits}"
f"{(', ' + extra) if extra else ''} ...")
# Generate the CRC function as Python code.
pyCode = self.genPython(funcName="crc_pyimpl")
execEnv = {}
exec(pyCode, execEnv)
crc_pyimpl = execEnv["crc_pyimpl"]
# Generate the CRC function as C code.
import os, time, importlib, shutil
from cffi import FFI
ffibuilder = FFI()
ffibuilder.set_source("testmod_crcgen", self.genC())
ffibuilder.cdef(self.genC(declOnly=True,
includeGuards=False,
includes=False))
tmpdir = f"tmp_{os.getpid()}_{int(time.time() * 1e6)}"
ffibuilder.compile(tmpdir=tmpdir, verbose=False)
testmod_crcgen = importlib.import_module(tmpdir + ".testmod_crcgen")
crc_cimpl = testmod_crcgen.lib.crc
# Compare the reference implementation to the Python and C code.
crcMask = (1 << self._nrCrcBits) - 1
dataMask = (1 << self._nrDataBits) - 1
for i in range(32):
if i == 0:
crc = 0
elif i == 1:
crc = crcMask
else:
crc = rng.randint(1, crcMask - 1)
for j in range(min(64, dataMask + 1)):
if j == 0:
data = 0
elif j == 1:
data = dataMask
else:
data = rng.randint(1, dataMask - 1)
for k in range(3):
ref = CrcReference.crc(
crc=crc,
data=data,
polynomial=self._P,
nrCrcBits=self._nrCrcBits,
nrDataBits=self._nrDataBits,
shiftRight=self._shiftRight)
py = crc_pyimpl(crc, data)
c = crc_cimpl(crc, data)
if ref != py or ref != c:
raise CrcGenError(
f"Test failed: "
f"P=0x{self._P:X}, "
f"nrCrcBits={self._nrCrcBits}, "
f"shiftRight={int(bool(self._shiftRight))}, "
f"nrDataBits={self._nrDataBits}, "
f"data=0x{data:X}, "
f"ref=0x{ref:X}, "
f"py=0x{py:X}, "
f"c=0x{c:X}")
crc = ref
data = (data + 1) & dataMask
finally:
if tmpdir:
shutil.rmtree(tmpdir, ignore_errors=True)
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