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#!/usr/bin/env python3
import logging
import os
import tempfile
import subprocess
import itertools
import pytest
from pycrc.models import CrcModels
from pycrc.algorithms import Crc
LOGGER = logging.getLogger(__name__)
use_algo_bit_by_bit = True
use_algo_bit_by_bit_fast = True
use_algo_table_driven = True
use_algo_table_slice = True
use_c89 = True
class TestCodeGen:
@pytest.mark.skipif(not use_algo_bit_by_bit, reason='bbb tests disabled')
def test_models_bbb_c99(self):
compile_and_test_models('bbb', 'c99')
@pytest.mark.skipif(not use_c89, reason='c89 tests disabled')
@pytest.mark.skipif(not use_algo_bit_by_bit, reason='bbb tests disabled')
def test_models_bbb_c89(self):
compile_and_test_models('bbb', 'c89')
@pytest.mark.skipif(not use_algo_bit_by_bit_fast, reason='bbf tests disabled')
def test_models_bbf_c99(self):
compile_and_test_models('bbf', 'c99')
@pytest.mark.skipif(not use_c89, reason='c89 tests disabled')
@pytest.mark.skipif(not use_algo_bit_by_bit_fast, reason='bbf tests disabled')
def test_models_bbf_c89(self):
compile_and_test_models('bbf', 'c89')
@pytest.mark.skipif(not use_algo_table_driven, reason='tbl tests disabled')
def test_models_tbl_c99(self):
compile_and_test_models('tbl', 'c99')
@pytest.mark.skipif(not use_c89, reason='c89 tests disabled')
@pytest.mark.skipif(not use_algo_table_driven, reason='tbl tests disabled')
def test_models_tbl_c89(self):
compile_and_test_models('tbl', 'c89')
@pytest.mark.skipif(not use_algo_table_driven, reason='tbl tests disabled')
@pytest.mark.skipif(not use_algo_table_slice, reason='tbl slice tests disabled')
def test_models_tbl_sb_c99(self):
compile_and_test_models('tbl', 'c99', ['--slice-by', '4'])
compile_and_test_models('tbl', 'c99', ['--slice-by', '8'])
compile_and_test_models('tbl', 'c99', ['--slice-by', '16'])
# --slice-by not supported with C89
@pytest.mark.skipif(not use_algo_table_driven, reason="tbl tests disabled")
def test_incomplete_models_tbl_c99(self):
params = ['width', 'poly', 'xor_in', 'reflect_in', 'xor_out', 'reflect_out']
for n in range(len(params)):
for c in itertools.combinations(params, n):
compile_and_test_incomplete_models('tbl', 'c99', c)
def test_special_cases(self):
compile_and_run_special_cases()
def test_variable_width(self):
compile_and_run_variable_width('bbb', 'c99')
compile_and_run_variable_width('bbf', 'c99')
compile_and_run_variable_width('tbl', 'c99')
def run_cmd(cmd):
LOGGER.info(' '.join(cmd))
ret = subprocess.run(cmd, check=True, capture_output=True)
return ret
def run_pycrc(args):
ret = run_cmd(['python3', 'pycrc.py'] + args)
return ret.stdout.decode('utf-8').rstrip()
def gen_src(tmpdir, args, name):
src_h = os.path.join(tmpdir, f'{name}.h')
gen = ['--generate', 'h', '-o', src_h]
run_pycrc(gen + args)
src_c = os.path.join(tmpdir, f'{name}.c')
gen = ['--generate', 'c-main', '-o', src_c]
run_pycrc(gen + args)
def compile_and_run(tmpdir, compile_args, run_args, name, check):
gen_src(tmpdir, compile_args, name)
binary = os.path.join(tmpdir, 'a.out')
compile_src(binary, os.path.join(tmpdir, name + '.c'))
run_and_check_res([binary] + run_args, check)
def compile_and_test_models(algo, cstd, opt_args=[]):
with tempfile.TemporaryDirectory(prefix='pycrc-test.') as tmpdir:
for m in CrcModels().models:
# Don't test width > 32 for C89, as I don't know how to ask for an data type > 32 bits.
if cstd == 'c89' and m['width'] > 32:
continue
args = args_from_model(m)
args += ['--algorithm', algo, '--std', cstd]
args += opt_args
compile_and_run(tmpdir, args, [], m['name'], m['check'])
def compile_and_test_incomplete_models(algo, cstd, erase_params=[]):
if cstd == 'c89':
pytest.skip('C89 not supported')
model = CrcModels().get_params('crc-32')
with tempfile.TemporaryDirectory(prefix='pycrc-test.') as tmpdir:
for algo in ['bbb', 'bbf', 'tbl']:
m = dict(model)
for param in erase_params:
del m[param]
args = args_from_model(m)
args += ['--algorithm', algo, '--std', cstd]
run_args = args_from_model({param: model[param] for param in erase_params})
compile_and_run(tmpdir, args, run_args, f'{m["name"]}_incomplete', m['check'])
def compile_and_run_special_cases():
with tempfile.TemporaryDirectory(prefix='pycrc-test.') as tmpdir:
crc_5_args = ['--model=crc-5', '--reflect-in=0', '--algorithm', 'table-driven']
compile_and_run(tmpdir, crc_5_args + ['--table-idx-width=8'], [], 'special', 0x01)
compile_and_run(tmpdir, crc_5_args + ['--table-idx-width=4'], [], 'special', 0x01)
compile_and_run(tmpdir, crc_5_args + ['--table-idx-width=2'], [], 'special', 0x01)
def compile_and_run_variable_width(algo, cstd):
check_str = "123456789"
models = CrcModels()
m = models.get_params('crc-64-jones')
with tempfile.TemporaryDirectory(prefix='pycrc-test.') as tmpdir:
for width in [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 23, 24, 25, 31, 32, 33, 63, 64]:
mask = (1 << width) - 1
mw = {
'width': width,
'poly': m['poly'] & mask,
'reflect_in': m['reflect_in'],
'xor_in': m['xor_in'] & mask,
'reflect_out': m['reflect_out'],
'xor_out': m['xor_out'] & mask,
}
args = [
'--width', '{:d}'.format(mw['width']),
'--poly', '{:#x}'.format(mw['poly']),
'--xor-in', '{:#x}'.format(mw['xor_in']),
'--reflect-in', '{:d}'.format(mw['reflect_in']),
'--xor-out', '{:#x}'.format(mw['xor_out']),
'--reflect-out', '{:d}'.format(mw['reflect_out']),
]
reference = Crc(width=mw['width'], poly=mw['poly'],
reflect_in=mw['reflect_in'], xor_in=mw['xor_in'],
reflect_out=mw['reflect_out'], xor_out=mw['xor_out'])
check = reference.bit_by_bit_fast(check_str)
compile_and_run(tmpdir, ['--algorithm', algo, '--std', cstd] + args, [], 'var_width', check)
def run_and_check_res(cmd, expected_crc):
res = run_cmd(cmd).stdout.decode('utf-8').rstrip()
assert res[:2] == '0x'
assert int(res, 16) == expected_crc
def compile_src(out_file, src_file, cstd='c99'):
run_cmd(['cc', '-W', '-Wall', '-pedantic', '-Werror', f'-std={cstd}', '-o', out_file, src_file])
def args_from_model(m):
args = []
if 'width' in m:
args += ['--width', f'{m["width"]:d}']
if 'poly' in m:
args += ['--poly', f'{m["poly"]:#x}']
if 'xor_in' in m:
args += ['--xor-in', f'{m["xor_in"]:#x}']
if 'reflect_in' in m:
args += ['--reflect-in', f'{m["reflect_in"]}']
if 'xor_out' in m:
args += ['--xor-out', f'{m["xor_out"]:#x}']
if 'reflect_out' in m:
args += ['--reflect-out', f'{m["reflect_out"]}']
return args
|
